PLC SYSTEMS INC
10-Q, 1997-08-14
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                    FORM 10-Q

     Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange
     Act of 1934. For the quarter ended June 30, 1997.

                         Commission file number 1-11388


                                PLC SYSTEMS INC.
             (Exact name of registrant as specified in its charter)


BRITISH COLUMBIA, CANADA                                 04-3153858
(State or other jurisdiction of             (I.R.S. Employer Identification No.)
 incorporation or organization)

10 FORGE PARK, FRANKLIN, MASSACHUSETTS                     02038
(Address of principal executive offices)                 (Zip Code)

       Registrant's telephone number, including area code: (508) 541-8800

                                   ----------

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the  preceding 12 months (or for such  shorter  period that the  registrant  was
required  to file  such  reports),  and (2) has  been  subject  to s uch  filing
requirements for the past 90 days.

YES __X__    NO ______.



                      APPLICABLE ONLY TO CORPORATE ISSUERS:


Indicate  the  number of shares  outstanding  of each of the  issuer's  class of
common stock, as of the latest practical date.

              Class                 Outstanding at August 12, 1997
              -----                 ------------------------------
    Common Stock, no par value              16,656,450







================================================================================

                                PLC SYSTEMS INC.

                                      Index



 Part I.Financial Information:

     Item 1.

     Condensed Consolidated Balance Sheets . . . . . . . . . . . . . .3

     Condensed Consolidated Statements of Operations . . . . . . . . .4

     Condensed Consolidated Statements of Cash Flows . . . . . . . . .5

     Notes to Condensed Consolidated Financial Statements. . . . . . .6


     Item 2.  Management's Discussion and Analysis
          of Financial Condition and Results of Operations . . . . 8-11


Part II.     Other Information:

     Item 1.    Legal Proceedings. . . . . . . . . . . . . . . . . . 12

     Item 2.    Changes in Securities. . . . . . . . . . . . . . . . 12

     Item 3.    Defaults by the Company Upon its Senior Securities . 12

     Item 4.    Submission of Matters to a Vote of Security Holders. 12

     Item 5.    Other Information. . . . . . . . . . . . . . . . . . 13

     Item 6.    Exhibits and Reports on Form 8-K . . . . . . . . . . 13



                                      -2-









ITEM 1.  FINANCIAL STATEMENTS
- --------------------------------------------------------------------------------

                                PLC SYSTEMS INC.
                      CONDENSED CONSOLIDATED BALANCE SHEETS
                                 (In thousands)

<TABLE>
<CAPTION>

                                                                 June 30,           December 31, 
                                                                  1997                  1996
                                                               -----------          ------------
                                                               (Unaudited)      
<S>                                                             <C>                   <C>        
                                     ASSETS
Current assets:
   Cash and cash equivalents ................................   $  1,680              $  3,039   
   Marketable securities ....................................       --                   5,470
   Accounts receivable, net .................................      3,786                 2,635
   Inventories ..............................................      3,052                 2,345
   Prepaid expenses and other current assets ................        589                   679
                                                                --------              --------
    Total current assets ....................................      9,107                14,168

Equipment, furniture and leasehold improvements, net ........      5,153                 4,712
Other assets ................................................        671                   537
                                                                --------              --------
    Total assets ............................................   $ 14,931              $ 19,417
                                                                ========              ========
                                                                                   
                                                                                   
                      LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:                                                               
  Accounts payable ..........................................   $  1,672              $    867
  Accrued clinical costs ....................................      1,070                   935
  Accrued compensation ......................................        331                   467
  Deferred revenue ..........................................        268                   339
  Other accrued liabilities .................................        376                   315
                                                                --------              --------
    Total current liabilities ...............................      3,717                 2,923

Capital lease obligations ...................................         21                    27
Commitments and contingencies                                                      
                                                                                   
Stockholders' equity:                                                              
Common stock, no par value,  25,000 shares authorized,                             
  16,646 and 16,419 shares issued and outstanding at June 30,                      
  1997 and  December 31, 1996, respectively .................     54,639                54,030
Accumulated deficit .........................................    (42,848)              (37,129)
Foreign currency translation ................................       (598)                 (434)
                                                                --------              --------
                                                                  11,193                16,467
                                                                --------              --------
Total liabilities and stockholders' equity ..................   $ 14,931              $ 19,417
                                                                ========              ========
</TABLE>


                  The accompanying notes are an integral part
              of the condensed consolidated financial statements.

                                      -3-








                                PLC SYSTEMS INC.
                 CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
                      (In thousands, except per share data)
                                   (Unaudited)


<TABLE>
<CAPTION>

                                             Three Months Ended       Six Months Ended
                                                  June 30,                 June 30,
                                             ------------------       ----------------
                                              1997       1996         1997       1996
                                              ----       ----         ----       ----
<S>                                        <C>         <C>         <C>         <C>     
Revenues:
  Product sales ........................   $  2,525    $    769    $  3,296    $  4,966
  Placement and service fees ...........        897         662       1,714       1,294
                                           --------    --------    --------    --------
    Total revenues .....................      3,422       1,431       5,010       6,260

Cost of revenues:
  Product sales ........................        905         174       1,241       1,260
  Placement and service fees ...........        565         202       1,059         506
                                           --------    --------    --------    --------
     Total cost of revenues ............      1,470         376       2,300       1,766

Gross profit ...........................      1,952       1,055       2,710       4,494

Operating expenses:
  Selling, general and administrative ..      3,518       1,591       6,335       3,042
  Research and development .............      1,146         559       2,217       1,318
                                           --------    --------    --------    --------
     Total operating expenses ..........      4,664       2,150       8,552       4,360
                                           --------    --------    --------    --------
Income (loss) from operations ..........     (2,712)     (1,095)     (5,842)        134

Other income:
  Interest income, net .................         42         161         133         299
  Gain (loss) from foreign currency, net        (27)         16         (10)        (55)
                                           --------    --------    --------    --------
                                                 15         177         123         244
                                           --------    --------    --------    --------

Income (loss) before income taxes ......     (2,697)       (918)     (5,719)        378
Provision (benefit) for income taxes ...       --           (15)       --             4
                                           --------    --------    --------    --------
Net income (loss) ......................   $ (2,697)   $   (903)   $ (5,719)   $    374
                                           ========    ========    ========    ========

Net income (loss) per share ............   $  (0.16)   $  (0.05)   $  (0.36)   $   0.02

Shares used to compute net income (loss)
  per share ............................     16,632      16,441      16,021      17,214

</TABLE>



                  The accompanying notes are an integral part
              of the condensed consolidated financial statements.

                                      -4-










                                PLC SYSTEMS INC.
                 CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (In thousands)
                                   (Unaudited)



<TABLE>
<CAPTION>
                                                                           Six  Months Ended
                                                                                June 30,    
                                                                           -----------------
                                                                             1997      1996
                                                                           -------    ------
<S>                                                                       <C>         <C>     

Operating activities:
 Net income (loss) ....................................................   $ (5,719)   $    374

 Adjustments to reconcile net income (loss) to net cash provided (used)
  for operating activities:
  Depreciation and amortization .......................................        843         524
  Change in assets and liabilities:
    Accounts receivable ...............................................     (1,092)      5,920
    Inventory .........................................................       (682)     (1,100)
    Prepaid expenses and other assets .................................        (41)       (654)
    Accounts payable ..................................................        790         860
    Deferred revenue ..................................................        (99)        106
    Accrued liabilities ...............................................         60        (538)
                                                                          --------    --------
Net cash provided (used) for operating activities .....................     (5,940)      5,492

Investing activities:
  Purchase of marketable securities ...................................       --       (16,442)
  Maturities of marketable securities .................................      5,470      13,501
  Purchase of fixed assets ............................................     (1,257)     (1,122)
                                                                          --------    --------
Net cash provided (used) for investing activities .....................      4,213      (4,063)

Financing activities:
  Net proceeds from sales of shares ...................................        609       2,264
  Repayment of stockholder notes ......................................       --           110
  Principal payments on capital lease obligations .....................         (6)         (4)
                                                                          --------    --------
Net cash provided by financing activities .............................        603       2,370

Effect of exchange rate changes on cash and cash equivalents ..........       (235)       (196)
                                                                          --------    --------
Net increase (decrease) in cash and cash equivalents ..................     (1,359)      3,603

Cash and cash equivalents at beginning of period ......................      3,039         704
                                                                          --------    --------
Cash and cash equivalents at end of period ............................   $  1,680    $  4,307
                                                                          ========    ========
</TABLE>



                  The accompanying notes are an integral part
              of the condensed consolidated financial statements.

                                      -5-










                                PLC SYSTEMS INC.
              NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS



1.  BASIS OF PRESENTATION

    The accompanying  unaudited condensed consolidated financial statements have
been prepared in accordance with generally  accepted  accounting  principles for
interim financial information and with the instructions to Form 10-Q and Article
10 of Regulation  S-X.  Accordingly,  they do not include all of the information
and footnotes required by generally accepted accounting  principles for complete
financial statements. In the opinion of management,  all adjustments (consisting
of normal recurring accruals)  considered necessary for a fair presentation have
been included.  Operating results for the three and six month periods ended June
30, 1997 are not necessarily  indicative of the results that may be expected for
the  year  ended  December  31,  1997.  For  further  information,  refer to the
consolidated   financial  statements  and  footnotes  thereto  included  in  the
Company's annual report on Form 10- K for the year ended December 31, 1996.

2.  NET INCOME (LOSS)  PER SHARE

    Net income per share is  calculated  using the  weighted  average  number of
shares and share  equivalents  outstanding  during the period  which  consist of
stock options and stock warrants. The net loss per share is calculated using the
weighted  average  number of shares  outstanding  during the period and does not
include share equivalents.

    In February 1997, the Financial  Accounting Standards Board issued Statement
No. 128,  "Earnings  per Share," which is required to be adopted on December 31,
1997. At that time, the Company will be required to change the method  currently
used to compute earnings per share and to restate all prior pe riods.  Under the
new requirements for calculating primary earnings per share, the dilutive effect
of stock  options will be excluded.  There is not expected to be a change to the
net income  (loss) per share for the three or six months  ended June 30, 1997 or
June 30, 1996 as a result of the new requirements.

3.  INVENTORY

    Inventories consist of the following (in thousands):

                                                        June 30,    December 31,
                                                          1997         1996
                                                        --------    ------------
            Raw materials . . . . . . . . . . . . . .    $1,682       $1,043
            Work in process . . . . . . . . . . . . .       616          306
            Finished goods. . . . . . . . . . . . . .       754          996  
                                                         ------       ------
                                                         $3,052       $2,345
                                                         ======       ======




                                      -6-









                                PLC SYSTEMS INC.
              NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
                                  (Continued)





4.  ISSUANCE OF CONVERTIBLE DEBENTURES

     In July, 1997, the Company entered into a $20 million financing commitment.
Under the terms of the financing,  The Company received $10,075,000 in July 1997
and will receive an additional  $10,075,000  in August 1997 from the issuance of
convertible  debentures  to  accredited  investors  through Smith Barney Inc. as
placement  agent.  The first tranche of debentures are due July 17, 2002 and the
second  tranche of  debentures  are due  August 14,  2002.  The  debentures  are
convertible into common shares under a predetermined  formula. The first tranche
of the  debentures  are  convertible  into  common  shares at the  lesser of (a)
$25.98,  or (b) the market  price of the  Company's  Common Stock at the time of
conversion,  with no more than 1,007,500 shares of Common Stock issuable in full
payment  of all  accrued  interest  and  principal.  The  second  tranche of the
debentures are  convertible  into common shares at the lesser of (a) $14.60,  or
(b) the market price of the  Company's  Common Stock at the time of  conversion,
with no more than  1,507,500  shares of Common Stock issuable in full payment of
all accrued interest and principal.

     The  Company  has  further  agreed  that  should the  Company 1.) receive a
recommendation of non-approval of its Pre-Market Application for its Heart Laser
System from the  Circulatory  Systems  Advisory  Panel of the U.S. Food and Drug
Administration  (the  "Panel") or 2.) not receive a  recommendation  of approval
from the Panel or FDA approval of its Pre-Market Application for its Heart Laser
System by August  14,  1998 then the  maximum  number of shares of Common  Stock
which the Company  shall be obligated to issue upon  conversion of the tranche 2
debentures shall be increased from 1,507,500 to 2,007,500.

     The convertible debentures will accrue interest at 5% per annum, payable in
cash or common stock at the  Company's  option,  at the time of  conversion.  In
connection with the issuance of the first tranche of convertible debentures, the
Company has issued 69,875 redeemable  warrants to these accredited  investors to
purchase shares of its Common Stock at $27. 81 per share. In connection with the
issuance of the second tranche of convertible debentures, the Company has issued
80,125 redeemable  warrants to these accredited  investors to purchase shares of
its Common Stock at $15.78 per share.  If the average  closing sale price of its
Common Stock for any  consecutive 30 trading day period  commencing  January 17,
1999  exceeds the  exercise  price by more than 50%,  the Company has the right,
exercisable  at any time upon 30 days notice to the holder to redeem the warrant
at a price of $.10 per warrant share. The warrants issued in connection with the
first tranche  expire on July 17, 2002. The warrants  issued in connection  with
the second tranche expire on August 14, 2002.

     The Company has agreed to register  the shares of common  stock  underlying
the debentures and the warrants.  As compensation  for its services as placement
agent,  Smith  Barney Inc.  receives a  placement  fee equal to 6 % of the gross
proceeds of all  securities  sold.  The  foregoing  transaction  was exempt from
registration  under the Securities Act of 1933, as amended by virtue of Rule 506
promulgated under Regulation D.


5.  LEGAL PROCEEDINGS

    The Company and certain of its  officers  have been named as  defendants  in
eleven purported  class action  lawsuits each filed in August 1997 in the United
States  District  Court for the  District  of  Massachusetts.  The suits  allege
violations of the federal securities laws. The plaintiffs are seeking damages in
connection with such alleged violations.  Although the outcome of these suits is
not currently predictable,  management believes that the Company has meritorious
defenses, and intends to vigorously defend the suits.









                                      -7-








ITEM 2.
- --------------------------------------------------------------------------------

                                PLC SYSTEMS INC.
                     MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                  FINANCIAL CONDITION AND RESULTS OF OPERATIONS

OVERVIEW

    The Company has two marketing  strategies  for selling the Heart Laser 1 TMR
System and its related  components  and sterile  kits:  placement  contracts and
product sales. The Company's  preferred strategy is to be reimbursed for the use
of the Heart  Laser TMR  System on a per  procedure  basis  under a  contractual
agreement  whereby the customer  commits to a minimum  number of procedures on a
yearly basis. These contracts typically run for a minimum of three to five years
and allow for the customer to exceed the contractual minimums.  These contracts,
referred to as placement  contracts,  are prefe rred to the sale strategy as the
Company  believes that over time,  the potential  revenue  stream is greater and
more profitable.  Sterile  handpieces and other  disposables are included in the
per procedure  fee.  Revenues from these  contracts are  classified as placement
fees.

    In foreign  countries  where credit risk is high or where health care is not
reimbursed by the government or insurance, the Heart Laser TMR System is sold as
capital  equipment and the related sterile  handpieces and other disposables are
sold separately for each  procedure.  The Company sells Hear t Laser TMR Systems
directly and through distributors. These sales are classified as product sales.

RESULTS OF OPERATIONS

    Total  revenues  for the  quarter  ended June 30, 1997 were  $3,422,000,  an
increase of 139% when  compared  to  $1,431,000  for the quarter  ended June 30,
1996.  Product  sales for the quarter  ended June 30, 1997 were  $2,525,000,  an
increase of 228% when  compared to $769,000 for the quarter ended June 30, 1996.
The major  factors in both of these  increases are the number of Heart Laser TMR
Systems  shipped and the method of sale.  For the quarter  ended June 30,  1997,
there were eight TMR Systems shipped;  five of which were sales as compared with
four TMR Systems  shipped in the quarter ended June 30, 1996, one of which was a
sale.

    Total revenues for the six month period ended June 30, 1997 were $5,010,000,
a decrease of 20% when compared to $6,260,000  for the six months ended June 30,
1996.  Product  sales  for the  six  month  period  ended  June  30,  1997  were
$3,296,000,  a decrease of 34% when  compared to  $4,966,000  for the six months
ended June 30, 1996.  The major factors in both of these year to date  decreases
are the number of TMR  Systems  sold and the  customer  mix.  For the six months
ended  June  30,  1997,  the  Company  sold  six  Heart  Laser  TMR  Systems  to
distributors  as  compared to the sale of seven Heart Laser TMR S ystems for the
six months ended June 30, 1996 of which

- --------------------

1. The Heart Laser is a trademark of PLC Medical Systems, Inc.



                                      -8-








                                PLC SYSTEMS INC.
                     MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                  FINANCIAL CONDITION AND RESULTS OF OPERATIONS
                                  (Continued)

six were sold  directly to customers  and one was sold to a  distributor.  Heart
Laser TMR Systems sold  directly to customers  typically  generate  higher sales
dollars then those sold to a distributor.

    Placement  and service fees for the three and six months ended June 30, 1997
were  $897,000  and  $1,714,000,  respectively,  an increase of 35% and 32% when
compared with $662,000 and $1,294,000 for the same periods in fiscal 1996. These
increases  reflect  the  continued  adoption of the  placement  co ntract as the
method of sale for the Heart Laser TMR Systems.

    Total gross profit for the three and six month  periods  ended June 30, 1997
approximated 57% and 54%, respectively, down from 74% and 72% for the comparable
periods in fiscal 1996.  This  decrease  resulted from two factors.  First,  the
total gross  margin  declined  due to  unfavorable  capacity  and  manufacturing
variances.  These  variances  resulted from the high level of overhead  expenses
associated with the new facility  coupled with increased  staffing.  The Company
anticipates  that  after  PMA  approval,  of which no  assurance  can be  given,
production  will increase to levels which will adequate ly absorb  manufacturing
overhead and mitigate these variances.  Secondly, as previously  discussed,  the
Company shipped less units under the sales strategy in 1997 than in 1996 and the
mix was primarily to  distributors  in 1997 as compared to direct sales in 1996.
Heart Laser TMR Systems  sold direct ly to  customers  typically  carry a higher
gross profit then those sold through distributors.

    Selling,   general  and   administrative   expenditures  of  $3,518,000  and
$6,335,000  for the three and six month periods  ending June 30, 1997  increased
121%  and 108%  respectively  when  compared  to  fiscal  1996  expenditures  of
$1,591,000 and  $3,042,000.  In  anticipation  of the U.S. launch of the Heart L
aser TMR System,  the Company increased its domestic sales and marketing efforts
and its  administrative  expenses by  approximately  $1,870,000 and  $2,874,000,
respectively for the three and six months ended June 30, 1997 as compared to the
same  periods in 1996.  The increase is  primarily  due to increa sed  staffing,
increased use of outside consultants, and other expenses.

    Research  and  development  expenditures  for the three and six months ended
June 30, 1997 was $1,146,000 and $2,217,000,  respectively,  an increase of 105%
and 68% when compared to research  spending of $559,000 and  $1,318,000  for the
comparable  periods in fiscal  1996.  This  increase  is  related  to  increased
staffing  requirements  associated  with  growing  demands  for  clinical  study
compilation and the development of new products.

    For the three and six month periods ended June 30, 1997,  interest income of
$42,000 and  $133,000,  respectively,  decreased  when  compared to $161,000 and
$299,000 for the  comparable  periods in fiscal 1996 due to a lower cash balance
in 1997 as compared with the 1996 periods.




                                      -9-





                                PLC SYSTEMS INC.
                     MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                  FINANCIAL CONDITION AND RESULTS OF OPERATIONS
                                  (Continued)

    The  Company  records  transactions  in several  foreign  currencies,  which
resulted in currency  fluctuation gains of $27,000 and $10,000 for the three and
six months  ended June 30,  1997 as  compared to a loss of $16,000 for the three
months  ended June 30, 1996 and a gain of $55,000 for the six mont hs ended June
30, 1996.

    The  Company  did not  record an income tax  provision  for the three or six
months  ended June 30, 1997 due to its net loss of  $2,697,000  and  $5,719,000,
respectively.  The  Company  believes  it  has  sufficient  net  operating  loss
carryforwards to offset taxable income, if any, for the year ended Decem ber 31,
1997. A provision  for income tax was made in the first quarter of 1996 to cover
the tax liability under the alternative  minimum tax regulations which cannot be
offset by net operating loss carryforwards.  With the $1,095,000  operating loss
incurred in the quarter ended June 30, 1996,  this  provision  was  subsequently
adjusted in the quarter ended June 30, 1996.

    The net loss of  $2,697,000  for the quarter  ended June 30, 1997  increased
199% when  compared to the net loss of $903,000  for the quarter  ended June 30,
1996.  For the six month period ended June 30, 1997,  the Company had a net loss
of $5,719,000 as compared with a net profit of $374,000 for the six month period
ended June 30, 1996.  As  previously  discussed in more  detail,  the  following
resulted  in a higher  loss for both the three and six  month  periods  in 1997;
lower mix of sales contracts at distributor  pricing,  unfavorable  capacity and
manufacturing variances, and higher overall expenses.

LIQUIDITY AND CAPITAL RESOURCES

    At June 30, 1997,  the Company had cash and cash  equivalents of $1,680,000.
On July 17, 1997, the Company  entered into a $20 million  financing  commitment
and received $10 million through the issuance of convertible debentures due July
17, 2002. On August 14, 1997,  the  remaining $10 million was committed  through
the issuance of  Convertible  debenture  due August 14, 2002.  See Note 4 in the
accompanying financial statements.

    For the six  months  ended June 30,  1997,  the  Company  incurred a loss of
$5,719,000  which  resulted in the use of  approximately  $5,900,000  to support
operations.  Cash provided by investing activities was approximately  $4,200,000
principally  related  to the  maturities  of  marketable  securities  offs et by
investment  in fixed assets of  $1,300,000  primarily  related to its  placement
contract  activity.  Cash  provided by financing  activities  was  approximately
$600,000 from the exercise of stock options and warrants.

    In February 1997, the Company's  PreMarket Approval  application ("PMA") was
filed by the FDA. In  anticipation  of a possible FDA approval,  the Company had
been increasing its overall operating  expenses and overhead to be positioned to
further increase its production 



                                      -10-








                                PLC SYSTEMS INC.
                     MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                  FINANCIAL CONDITION AND RESULTS OF OPERATIONS
                                  (Continued)

capacities.  In order to be  adequately  positioned to meet these  demands,  the
Company secured financing in July 1997.

    On July 28, 1997, an FDA Advisory  Panel reviewed the data collected to date
on the Heart Laser TMR System.  The Advisory  Panel  recommended a  non-approval
with the  requirement of additional data to complete the randomized  study.  The
Panel did not recommend a new study.  The Heart Laser TMR Sy stem remains on the
expedited   review  path  and  will   continue  to  be  used  by  its   clinical
investigators.  The  Company  intends  to meet with the FDA  shortly  to seek to
finalize a plan for the  re-submission,  and hopes to submit the data to the FDA
from the completed study later in the fall of 1997.

    As a result of the recent FDA Advisory Panel decision,  a revised time frame
for possible FDA approval has not been projected.  Given this delay, the Company
will  monitor its  operating  expenses  closely and will  minimize  increases to
expenses  and  overhead  during  this  period.  With the $20 millio n  financing
commitment  secured  in  July,  the  Company  believes  that  it has  sufficient
resources  to meet its  working  capital  demands  for a least  the next  twelve
months.

    Unanticipated  decreases in operating revenues,  increases in expenses, or a
further delay in the expected FDA approval,  may adversely  impact the Company's
cash position.  The Company may seek additional  financing  through the issuance
and sale of debt or equity  securities,  bank  financing,  joint  ventures or by
other means.  The availability of such financing and the  reasonableness  of any
related terms in comparison to market conditions cannot be assured.

    The Company  believes that operating losses are likely until after such time
as the  Company  receives  its PMA from the FDA for the Heart  Laser TMR System.
Although the Heart Laser TMR System has been granted  "expedited  review" status
by the FDA, the Company  cannot  project  when, if at all, such approval will be
granted or that any approval will include desirable claims. Any failure or delay
in  receiving  any such  approval  would have a material  adverse  effect on the
Company's business,  financial condition and results of operations. In addition,
the Company must also convince  health care p  rofessionals,  third party payors
and the general  public of the medical and economic  benefits of the Heart Laser
TMR System.  No assurance  can be given that the Company will be  successful  in
marketing the Heart Laser TMR System or that the Company will be able to operate
profitably on a consistent b asis.

     This  report  contains  forward-looking  statements  regarding  anticipated
increases  in revenues,  marketing  of products and proposed  products and other
matters.  These  statements,  in addition to statements made in conjunction with
the words  "anticipate,"  "except,"  "intend,"  believe," "seek," "estimate" and
similar  expressions  are  forward-looking  statements  that involve a number of
risks and uncertainties.  The following is a list of factors, among others, that
would  cause  actual  results  to  differ  materially  from  the  foward-looking
statements:  approval  by the  U.S.  Food  and  Drug  Administration,  business
conditions  and  growth in certain  market  segments  and general  economy,  an
increase  in  competition,  increased  or  continued  market  acceptance  of the
Company's  products and  proposed  products,  and other risks and  uncertainties
indicated  from time to time in the Company's  filings with the  Securities  and
Exchange Commission.



                                      -11-







                                PLC SYSTEMS INC.
                           Part II Other Information




ITEM 1. LEGAL PROCEEDINGS.

        The Company and certain of its officers have been named as defendants in
        eleven purported  class action lawsuits each filed in August 1997 in the
        United  States  District  Court for the District of  Massachusetts.  The
        suits allege  violations of the federal  securities laws. The plaintiffs
        are  seeki ng  damages  in  connection  with  such  alleged  violations.
        Although  the  outcome  of  these  suits is not  currently  predictable,
        management  believes  that the Company  has  meritorious  defenses,  and
        intends to vigorously defend the suits.

ITEM 2. CHANGES IN SECURITIES.

        In  July,  1997,  the  Company  entered  into  a $20  million  financing
        commitment.  Under  the terms of the  financing,  The  Company  received
        $10,075,000  in July 1997 and will receive an additional  $10,075,000 in
        August 1997 from the issuance of  convertible  debentures  to accredited
        investors  through  Smith  Barney Inc.  as  placement  agent.  The first
        tranche of  debentures  are due July 17, 2002 and the second  tranche of
        debentures are due August 14, 2002. The debentures are convertible  into
        common shares under a  predetermined  formula.  The first tranche of the
        debentures  are  convertible  into  common  shares at the  lesser of (a)
        $25.98,  or (b) the market  price of the  Company's  Common Stock at the
        time of conversion,  with no more than 1,007,500  shares of Common Stock
        issuable in full  payment of all accrued  interest  and  principal.  The
        second tranche of the debentures are  convertible  into common shares at
        the  lesser of (a)  $14.60,  or (b) the  market  price of the  Company's
        Common  Stock at the time of  conversion,  with no more  than  1,507,500
        shares of Common Stock issuable in full payment of all accrued  interest
        and principal.

        The  Company  has  further  agreed that should the Company 1.) receive a
        recommendation  of  non-approval  of its Pre-Market  Application for its
        Heart Laser System from the  Circulatory  Systems  Advisory Panel of the
        U.S.  Food and Drug  Administration  (the  "Panel") or 2.) not receive a
        recommendation  of  approval  from  the  Panel  or FDA  approval  of its
        Pre-Market  Application  for its Heart  Laser  System by August 14, 1998
        then the  maximum  number of shares of Common  Stock  which the  Company
        shall be obligated to issue upon  conversion of the tranche 2 debentures
        shall be increased from 1,507,500 to 2,007,500.

        The convertible debentures will accrue interest at 5% per annum, payable
        in  cash  or  common  stock  at the  Company's  option,  at the  time of
        conversion.  In  connection  with the  issuance of the first  tranche of
        convertible  debentures,   the  Company  has  issued  69,875  redeemable
        warrants to these accredited  investors to purchase shares of its Common
        Stock at $27.  81 per share.  In  connection  with the  issuance  of the
        second tranche of convertible debentures,  the Company has issued 80,125
        redeemable warrants to these accredited  investors to purchase shares of
        its Common Stock at $15.78 per share.  If the average closing sale price
        of its Common Stock for any consecutive 30 trading day period commencing
        January  17,  1999  exceeds  the  exercise  price by more than 50%,  the
        Company  has the right,  exercisable  at any time upon 30 days notice to
        the holder to redeem the warrant at a price of $.10 per  warrant  share.
        The warrants  issued in connection with the first tranche expire on July
        17, 2002.  The warrants  issued in  connection  with the second  tranche
        expire on August 14, 2002.

        The Company has agreed to register the shares of common stock underlying
        the debentures  and the warrants.  As  compensation  for its services as
        placement agent, Smith Barney Inc. receives a placement fee equal to 6 %
        of the gross proceeds of all securities sold. The foregoing  transaction
        was  exempt  from  registration  under the  Securities  Act of 1933,  as
        amended by virtue of Rule 506 promulgated under Regulation D.



ITEM 3. DEFAULTS BY THE COMPANY UPON ITS SENIOR SECURITIES.

        None

ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY-HOLDERS.

        On June 30,  1997,  the  Company  held its  Annual  General  Meeting  of
        Stockholders to vote on the following proposals:

        1.  To elect  two  members  of the  Board  of  Directors.  Nominees  for
            Director  were:  (a) Patricia L. Murphy and (b) Kenneth J.  Pulkonik
            ("Proposal No.1");

        2.  To appoint Ernst & Young LLP as auditors for Fiscal Year 1997 and to
            authorize  the Directors to fix the  remuneration  to be paid to the
            auditors ("Proposal No. 2");

        Of the 16,627,537  shares of the Company's  Common Stock of record as of
May  23,  1997  able to be  voted  at the  meeting,  a  total  of  approximately
12,295,713 shares were voted, or approximately 73.9% of the Company's issued and
outstanding  shares of Common Stock entitled to vote on these  matters.  Each of
the proposals was adopted, with the vote total as follows: 







                                      -12-








                             PLC SYSTEMS INC. Part
                        II Other Information - Continued


                                    SHARES        SHARES        SHARES 
        PROPOSAL                  VOTING FOR  VOTING AGAINST  ABSTAINING
        --------                  ----------  --------------  ----------

        NO. 1

       (a) Patricia L. Murphy     12,020,533           0       275,180

       (b) Kenneth J. Pulkonik    12,037,637           0       258,076

       NO. 2                      12,112,130      73,363       110,220


ITEM 5. OTHER INFORMATION

        None

ITEM 6. EXHIBITS AND REPORTS ON FORM 8-K

        a.)                           Exhibits
                                      --------

        (I) The following exhibits are filed herewith:

        Exhibit
          No.                           Title
        -------                       --------
          10a      Convertible Debenture Agreement.

          10b      First Amendment to Convertible Debenture Agreement.

          10c      Second Amendment to Convertible Debenture Agreement.

          10d      Form of Convertible Debenture.

          10e      Form of Redeemable Warrant.

          10f      Registration Rights Agreement.

          11       Statement re computation of per-share earnings.

          27       Financial Data Schedule.

        b.)  Reports on Form 8-K

             None
   



                                      -13-








                                PLC SYSTEMS INC.
                            Part II Other Information
                                   (Continued)






SIGNATURES

   Pursuant to the  requirements  of the  Securities  Exchange Act of 1934,  the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned thereunto duly authorized.




                                   PLC SYSTEMS INC.
                                   Registrant



Date:    August 14, 1997           /s/  Patricia L. Murphy
     ------------------------      -------------------------------
                                   Patricia L. Murphy
                                   (Chief Financial Officer)











                                      -14-






Exhibit 10a





                    CONVERTIBLE DEBENTURE PURCHASE AGREEMENT

                                      Among


                                PLC SYSTEMS INC.,



                   SOUTHBROOK INTERNATIONAL INVESTMENTS, LTD.,


                                 HBK CAYMAN L.P.


                                       and


                             HBK OFFSHORE FUND LTD.

                         ------------------------------



                                  July 17, 1997



                         ------------------------------










         CONVERTIBLE  DEBENTURE  PURCHASE  AGREEMENT,  dated as of July 17, 1997
(this "Agreement"), among PLC Systems Inc., a corporation organized and existing
under  the  laws  of  British  Columbia,  Canada  (the  "Company"),   Southbrook
International   Investments,   Ltd.,  a  British  Virgin   Islands   corporation
("Southbrook"),  HBK Cayman L.P., a Cayman Islands  exempt  limited  partnership
("HBK  Cayman"),  and HBK Offshore Fund Ltd., a Cayman  Islands  exempt  company
("HBK  Offshore").  Southbrook,  HBK Cayman and HBK Offshore are each  sometimes
referred to herein as a "Purchaser" and collectively as the "Purchasers".

         WHEREAS,  subject  to the  terms  and  conditions  set  forth  in  this
Agreement,  the  Company  desires  to issue and sell to the  Purchasers  and the
Purchasers desire to purchase up to an aggregate principal amount of $20,000,000
of the Company's to be created 5% Convertible Debentures, due July 17, 2002 (the
"Convertible  Debentures"),  which are convertible  into shares of the Company's
common stock, no par value (the "Common Stock").

         IN  CONSIDERATION  of the mutual  covenants  and  agreements  set forth
herein  and  for  other  good  and  valuable  consideration,   the  receipt  and
sufficiency of which is hereby acknowledged, the parties agree as follows:


                                    ARTICLE I

                   PURCHASE AND SALE OF CONVERTIBLE DEBENTURES

         1.1      Purchase  and Sale.  Subject to the terms and  conditions  set
forth  herein,  the  Company  shall  issue  and sell to the  Purchasers  and the
Purchasers shall purchase an aggregate  principal amount of up to $20,000,000 of
Convertible  Debentures,  in denominations of $250,000 and integral multiples of
$50,000 in excess  thereof,  at the closings  described  below.  All  references
herein to "dollars" or "$" shall be to U.S.  dollars  (U.S.$)  unless  otherwise
specified.

         1.2      The Closings.

                  (a) The  Tranche  1  Closing.  (i)  Subject  to the  terms and
conditions set forth in this Agreement,  the Company shall issue and sell to the
Purchasers and the Purchasers  shall purchase an aggregate  principal  amount of
$10,000,000  of  Convertible  Debentures  (the  "Tranche 1  Debentures")  for an
aggregate purchase price of $10,000,000, each Purchaser being obligated to pay a
purchase  price  equal to the  principal  amount of Tranche 1  Debentures  to be
issued and sold to it at the Tranche 1 Closing (as defined  below).  The closing
of the purchase and sale of the Tranche 1 Debentures  (the  "Tranche 1 Closing")
shall take place at the offices of Robinson  Silverman  Pearce Aronsohn & Berman
LLP  ("Robinson  Silverman"),  1290 Avenue of the Americas,  New York,  New York
10104,  immediately  following  the  









execution  hereof or such later date as the parties shall agree. The date of the
Tranche 1 Closing is hereinafter referred to as the "Tranche 1 Closing Date."

                           (ii) At the Tranche 1 Closing,  (a) the Company shall
deliver (A) to Southbrook (1) $5,000,000 aggregate principal amount of Tranche 1
Debentures  and the  Southbrook  Tranche 1 Warrant (as defined in Section 3.17),
each registered in the name of the  Southbrook,  (2) the legal opinion of Mintz,
Levin,  Cohn,  Ferris,   Glovsky  and  Popeo,  P.C.  and  of  DuMoulin,   Black,
substantially  in  the  form  attached  hereto  as  Exhibit  E (the  "Tranche  1
Opinion"),  and (3) all other  documents,  instruments and writings  required to
have been  delivered  at or prior to the  Tranche 1 Closing  by the  Company  to
Southbrook  pursuant  to  this  Agreement;  (B) to  HBK  Cayman  (1)  $2,500,000
aggregate  principal amount of Tranche 1 Debentures and the Tranche 1 HBK Cayman
Warrant (as defined in Section 3.17), each registered in the name of HBK Cayman,
(2) the Tranche 1 Opinion, and (3) all other documents, instruments and writings
required  to have been  delivered  at or prior to the  Tranche 1 Closing  by the
Company  to HBK Cayman  pursuant  to this  Agreement;  (C) to HBK  Offshore  (1)
$2,500,000  aggregate  principal  amount  of  Tranche 1  Debentures  and the HBK
Offshore Tranche 1 Warrant (as defined in Section 3.17),  each registered in the
name of HBK Offshore,  (2) the Tranche 1 Opinion,  and (3) all other  documents,
instruments  and  writings  required to have been  delivered  at or prior to the
Tranche 1 Closing by the Company to HBK Offshore pursuant to this Agreement, and
(b) each  Purchaser  shall deliver to the Company (1) the purchase price for the
Tranche 1 Debentures being purchased by it at the Tranche 1 Closing,  determined
in accordance  with Section  1.2(a)(i),  in United States dollars in immediately
available  funds by wire  transfer  to an account  designated  in writing by the
Company for such purpose on or prior to the Tranche 1 Closing Date,  and (2) all
documents,  instruments and writings required to have been delivered at or prior
to the Tranche 1 Closing by such Purchaser pursuant to this Agreement.

                  (b) The  Tranche  2  Closing.  (i)  Subject  to the  terms and
conditions  set forth in this  Agreement,  the  Company  shall have the right by
delivery of a written notice to the Purchasers (a "Subsequent  Tranche  Notice")
to require the Purchasers to purchase  Convertible  Debentures in such aggregate
principal  amount up to  $10,000,000 as the Company may designate in such notice
(the "Tranche 2 Debentures"),  each Purchaser  being  obligated  (subject to the
terms and conditions hereof) to purchase such portion of the aggregate principal
amount of such  Convertible  Debentures  as  equals  such  Purchaser's  pro rata
portion of the  aggregate  principal  amount of Tranche 1 Debentures  issued and
sold at the Tranche 1 Closing.  The Company  may  deliver a  Subsequent  Tranche
Notice no earlier  than the  expiration  of the 60th  Trading Day after the date
that  a  registration   statement  (an   "Underlying   Securities   Registration
Statement")  contemplated by the Registration  Rights Agreement,  dated the date
hereof,  among  the  Purchasers  and the  Company  substantially  in the form of
Exhibit B attached hereto (the "Registration Rights Agreement") covering,  among
other things, the shares of Common Stock issuable upon conversion of the Tranche
1  Debentures  and the shares of Common  Stock  issuable  upon  exercise  of the
Tranche 1 Warrants (as defined in Section 3.17) has been  declared  effective by
the  Securities  and Exchange  Commission  (the  "Commission")  (provided,  that
Trading Days during which any Purchaser (or its successors, permitted assigns or
other  successors  in  interest)  is  unable  to resell  securities  under  such
Underlying Securities  



                                       3




Registration  Statement  shall be added to such 60 Trading Day  period),  and no
later than  February 28, 1998 (the  "Tranche 2 Closing  Expiration  Date").  The
closing of the  purchase and sale of the Tranche 2  Debentures  (the  "Tranche 2
Closing")  shall take place at the  offices of Robinson  Silverman  on such date
(which  may not be prior to the  fifteenth  Trading  Day  after  receipt  by the
Purchasers of the Subsequent Tranche Notice); provided that in no case shall the
Tranche 2 Closing take place unless and until the  conditions  listed in Section
4.1 have been  satisfied  or waived by the  appropriate  party.  The date of the
Tranche 2 Closing is  hereinafter  referred to as the "Tranche 2 Closing  Date."
Notwithstanding  anything to the contrary  contained herein, the Company may, by
written notice to each  Purchaser  provided prior to the Tranche 2 Closing Date,
revoke such  Subsequent  Tranche Notice in the event that the closing sale price
of the Common  Stock,  as reported by the American  Stock  Exchange or any other
exchange or market on which the Common Stock is then  traded,  decreases by more
than 20% from the date of the  delivery  of the  Subsequent  Tranche  Notice and
prior to the Tranche 2 Closing Date.

                           (ii) At the Tranche 2 Closing,  (a) the Company shall
deliver (A) to each  Purchaser  (1) a pro rata portion of the  principal  amount
(determined by reference to the principal amount of Tranche 1 Debentures  issued
and sold at the Tranche 1 Closing) of the Tranche 2 Debentures  to be issued and
sold thereat (or such other  principal  amount upon which the parties may agree)
and the  applicable  Tranche  2 Warrant  (as  defined  in  Section  3.17),  each
registered  in the name of the  appropriate  Purchaser,  (2) the  legal  opinion
referenced  in Section  4.1(k),  substantially  in the form  attached  hereto as
Exhibit E, and (3) all other  documents,  instruments  and writings  required to
have been  delivered  at or prior to the Tranche 2 Closing by the Company to the
Purchasers  pursuant to this Agreement;  and (b) each Purchaser shall deliver to
the Company (1) the purchase price for the Tranche 2 Debentures  being purchased
by it at the Tranche 2 Closing, determined in accordance with Section 1.2(a)(i),
in United States dollars in immediately  available  funds by wire transfer to an
account designated in writing by the Company for such purpose on or prior to the
Tranche 2 Closing Date and (2) all documents,  instruments and writings required
to have been  delivered  at or prior to the Tranche 2 Closing by such  Purchaser
pursuant  to  this  Agreement.  In  the  event  that  a  Purchaser  ("Defaulting
Purchaser")  fails to purchase  Tranche 2  Debentures  in  accordance  with this
Section  1.2(b)(ii)  despite the  performance by the Company of its  obligations
under this Section and the  satisfaction  by the Company of the  conditions  set
forth in Section 4.1, the Company shall notify the  non-Defaulting  Purchaser of
such  failure  whereby  the  non-Defaulting  Purchaser  shall have the option to
purchase  all or any  portion of the  remaining  Tranche 2  Debentures  within 5
Business  Days from the later of the date it receives  notice of such option and
the Tranche 2 Closing Date. If the  non-Defaulting  Purchaser  does not elect to
purchase the  remaining  Tranche 2  Debentures,  the Company may then assign the
Defaulting  Purchaser's  rights hereunder to a third party, which party shall be
reasonably   acceptable  to  the  non-Defaulting   Purchaser,   without  further
obligation  to the  Defaulting  Purchaser to purchase the Tranche 2  Debentures.
Failure  by any  Purchaser  to buy  Tranche 2  Debentures  shall not  affect the
Company's  obligations with respect to the Tranche 1 Debentures acquired by such
Purchaser, which shall remain unaffected thereby.



                                       4





         1.3      Form of Debentures.  The Tranche 1 Debentures  shall be in the
form of Exhibit A attached  hereto.  The Tranche 2 Debentures shall be identical
to the Tranche 1 Debentures,  mutatis mutandis, except that the Conversion Price
(as  defined  below)  for the  Tranche  2  Debentures  shall  be reset as of the
Original Issue Date (as defined below) for the Tranche 2 Debentures.

                  For purposes of this Agreement,  "Conversion Price," "Original
Issue Date,"  "Trading Day" and "Per Share Market Value" shall have the meanings
set forth in the Tranche 1 Debentures.


                                   ARTICLE II

                         REPRESENTATIONS AND WARRANTIES

         2.1      Representations, Warranties and Agreements of the Company. The
Company  hereby  makes  the  following  representations  and  warranties  to the
Purchasers:

                  (a)   Organization  and   Qualification.   The  Company  is  a
corporation, duly incorporated,  validly existing and in good standing under the
laws of  British  Columbia,  Canada,  with the  requisite  corporate  power  and
authority to own and use its  properties and assets and to carry on its business
as currently conducted.  The Company has no subsidiaries other than as set forth
in Schedule 2.1(a) (collectively, the "Subsidiaries").  Each of the Subsidiaries
is a corporation, duly incorporated, validly existing and in good standing under
the  laws  of  the  jurisdiction  of  its   incorporation  or  organization  (as
applicable),  with the full  corporate  power and  authority  to own and use its
properties and assets and to carry on its business as currently conducted.  Each
of the Company and the  Subsidiaries  is duly qualified to do business and is in
good standing as a foreign  corporation in each jurisdiction in which the nature
of the  business  conducted  or  property  owned by it makes such  qualification
necessary,  except where the failure to be so qualified or in good standing,  as
the case may be,  could not,  individually  or in the  aggregate  reasonably  be
expected to (x) adversely  affect the legality,  validity or  enforceability  of
this Agreement, the Convertible Debentures,  the Warrants (as defined in Section
3.17),  the Registration  Rights  Agreement and the documents  setting forth the
terms  of  any  preferred  stock  in  which  the   Convertible   Debentures  are
exchangeable as provided under the Convertible Debentures, if any (collectively,
the "Transaction Documents"), (y) have or result in a material adverse effect on
the results of  operations,  assets,  prospects,  or financial  condition of the
Company and the  Subsidiaries,  taken as a whole,  or (z)  adversely  impair the
Company's  ability to perform fully on a timely basis its obligations  under the
Transaction Documents (a "Material Adverse Effect").

                  (b) Authorization;  Enforcement. The Company has the requisite
corporate  power and authority to enter into and to consummate the  transactions
contemplated  by the  Transaction  Documents  and  otherwise  to  carry  out its
obligations  thereunder.  The execution and delivery of each of the  Transaction
Documents  by  the  Company  and  the  consummation  by it of  the  transactions
contemplated  thereby have been duly  authorized by all necessary  action 



                                       5





on the part of the  Company.  Each of the  Transaction  Documents  has been duly
executed by the Company and when  delivered in accordance  with the terms hereof
shall  constitute  the valid and binding  obligation of the Company  enforceable
against the Company in accordance with its terms,  except as such enforceability
may be limited by applicable bankruptcy, insolvency, reorganization, moratorium,
liquidation or similar laws relating to, or affecting  generally the enforcement
of, creditors'  rights and remedies or by other equitable  principles of general
application.  Neither the Company nor any  Subsidiary  is in violation of any of
the provisions of its respective certificate of incorporation, articles, by-laws
or other charter documents (or their foreign equivalents).

                  (c)  Capitalization.  The  authorized,  issued and outstanding
capital  stock of the  Company  is set forth in  Schedule  2.1(c).  No shares of
Common Stock are entitled to preemptive or similar rights,  nor is any holder of
the Common Stock  entitled to  preemptive or similar  rights  arising out of any
agreement or understanding  with the Company by virtue of any of the Transaction
Documents.  Except as disclosed  in Schedule  2.1(c),  there are no  outstanding
options,  warrants,  script rights to subscribe to, calls or  commitments of any
character  whatsoever  relating  to, or,  except as a result of the purchase and
sale of the Convertible Debentures and Warrants hereunder, securities, rights or
obligations convertible into or exchangeable for, or giving any person any right
to  subscribe  for  or  acquire  any  shares  of  Common  Stock,  or  contracts,
commitments,  understandings,  or  arrangements  by  which  the  Company  or any
Subsidiary is or may become bound to issue additional shares of Common Stock, or
securities or rights convertible or exchangeable into shares of Common Stock. To
the  knowledge  of the  Company,  except as  specifically  disclosed  in the SEC
Documents (as defined  below) or Schedule  2.1(c),  no Person (as defined below)
beneficially  owns (as determined  pursuant to Rule 13d-3  promulgated under the
Securities  Exchange Act of 1934,  as amended (the  "Exchange  Act")) or has the
right to acquire by  agreement  with or by  obligation  binding upon the Company
beneficial ownership of in excess of 5% of the Common Stock. A "Person" means an
individual or corporation,  partnership,  trust,  incorporated or unincorporated
association,  joint venture,  limited  liability  company,  joint stock company,
government (or an agency or subdivision thereof) or other entity of any kind.

                  (c)  Issuance of  Convertible  Debentures  and  Warrants.  The
Convertible  Debentures and the Warrants are duly  authorized,  and, when issued
and paid for in accordance with the terms hereof, shall be validly issued, fully
paid and  nonassessable.  The  Company,  as at the  Tranche 1  Closing  Date and
Tranche  2  Closing  Date,  as the case may be  (each,  a  "Closing  Date"  and,
collectively,  the "Closing Dates"),  has and at all times while the Convertible
Debentures and the Warrants are outstanding will maintain an adequate reserve of
duly  authorized  shares of Common Stock to enable it to perform its conversion,
exercise  and other  obligations  under this  Agreement,  the  Warrants  and the
Convertible  Debentures,  and  in  no  circumstances  shall  such  reserved  and
available shares of Common Stock be less than the sum of (i) 1,000,000 shares of
Common Stock for issuance  upon  conversion  of the Tranche 1 Debentures  and to
enable the  Company to pay  interest on the  Tranche 1  Debentures  and (ii) the
number of shares of Common Stock which would be issuable  upon  exercise in full
of the Tranche 1 Warrants. The Company and the Purchasers agree that all penalty
interest,  liquidated  damages and early redemption or repayment amounts payable
pursuant to any  


                                       6




Transaction Documents shall be paid in cash unless otherwise consented to by the
Purchasers.  The shares of Common Stock issuable upon  conversion of Convertible
Debentures and upon exercise of the Warrants are collectively referred to herein
as the  "Underlying  Shares."  When issued in  accordance  with the terms of the
Convertible  Debentures  and the Warrants,  the  Underlying  Shares will be duly
authorized,  validly  issued,  fully  paid and  nonassessable.  The  Convertible
Debentures,  Warrants and Underlying Shares are collectively  referred to herein
as the "Securities."

                  (d) No Conflicts.  The execution,  delivery and performance of
the Transaction  Documents by the Company and the consummation by the Company of
the transactions  contemplated  thereby do not and will not (i) conflict with or
violate any provision of its Certificate of  Incorporation  or Articles (each as
amended  through the date  hereof) or (ii)  subject to  obtaining  the  Required
Approvals  (as defined  below),  conflict  with,  or constitute a default (or an
event which with notice or lapse of time or both would become a default)  under,
or  give to  others  any  rights  of  termination,  amendment,  acceleration  or
cancellation of, any agreement,  indenture or instrument to which the Company is
a party, or (iii) to the knowledge of the Company,  result in a violation of any
law, rule, regulation, order, judgment,  injunction, decree or other restriction
of any  court  or  governmental  authority  to  which  the  Company  is  subject
(including  Federal,  state and foreign securities laws and regulations),  or by
which any material property or asset of the Company is bound or affected, except
in the  case of each of  clauses  (ii)  and  (iii),  such  conflicts,  defaults,
terminations,  amendments, accelerations,  cancellations and violations as could
not,  individually  or in the  aggregate,  have or result in a Material  Adverse
Effect.  Neither  the  business  of the  Company  nor any  Subsidiary  is  being
conducted in violation of any  applicable  law,  ordinance or  regulation of any
governmental  authority which could,  individually  or in the aggregate,  have a
Material Adverse Effect.

                  (e)  Consents  and  Approvals.  Neither  the  Company  nor any
Subsidiary is required to obtain any consent, waiver, authorization or order of,
or make any filing or  registration  with,  any court or other  Federal,  state,
local,  foreign or other  governmental  authority or other Person in  connection
with the execution,  delivery and  performance by the Company of the Transaction
Documents  other than (i) the filing of the Underlying  Securities  Registration
Statements  with the  Commission,  which shall be filed in the time  periods set
forth  in the  Registration  Rights  Agreement,  (ii) the  applications  for the
listing of the Underlying  Shares with the American Stock Exchange (and with any
other national  securities  exchange or market on which the Common Stock is then
listed),  and (iii) other than, in all other cases,  where the failure to obtain
such consent, waiver,  authorization or order, or to give or make such notice or
filing,  could not reasonably be expected to have or result in,  individually or
in the aggregate, a Material Adverse Effect and to deliver to the Purchasers the
Convertible Debentures or the Warrant (and, upon conversion or exercise thereof,
the Underlying Shares) in the manner contemplated hereby and by the Registration
Rights  Agreement  free and clear of all liens and  encumbrances  of any  nature
whatsoever (the "Required Approvals").

                  (f) Litigation;  Proceedings. Except as specifically disclosed
in the Disclosure Materials (as defined below), there is no action, suit, notice
of violation,  proceeding or investigation  pending or, to the best knowledge of
the  Company,  threatened



                                       7




against,  or affecting  the Company or any of its  Subsidiaries  or any of their
respective  properties  before or by any court,  governmental or  administrative
agency or regulatory  authority  (Federal,  state,  local or foreign)  which (i)
adversely  affects to or challenges the legality,  validity or enforceability of
any of the Transaction  Documents or the Securities or (ii) could,  individually
or in the aggregate, have or result in a Material Adverse Effect.

                  (g) No Default  or  Violation.  Neither  the  Company  nor any
Subsidiary  (i) is in default  under or in violation of any  indenture,  loan or
credit  agreement or any other agreement or instrument to which it is a party or
by which it or any of its properties is bound, (ii) is in violation of any order
of any  court,  arbitrator  or  governmental  body  (Federal,  state,  local  or
foreign),  or (iii) is in violation of any statute,  rule or  regulation  of any
governmental authority,  except in each case as could not reasonably be expected
to  individually  or in the aggregate have or result in,  individually or in the
aggregate, a Material Adverse Effect.

                  (h)  Private  Offering.  Neither  the  Company  nor any Person
acting on its behalf has taken or will take any action  which might  subject the
offering, issuance or sale of the Securities to the registration requirements of
the Securities Act of 1933, as amended (the "Securities Act").

                  (i) SEC Documents.  The Company has filed all reports required
to be filed by it under the  Securities  Exchange  Act of 1934,  as amended (the
"Exchange Act"),  including pursuant to Section 13(a) or 15(d) thereof,  for the
two years  preceding the date hereof (or such shorter  period as the Company was
required  by  law  to  file  such  material)  (the  foregoing   materials  being
collectively  referred to herein as the "SEC Documents"  and,  together with the
Schedules to this Agreement and the Confidential  Private  Placement  Memorandum
dated July 1, 1997  furnished  by or on behalf of the Company,  the  "Disclosure
Materials") on a timely basis, or has received a valid extension of such time of
filing. As of their respective dates, the SEC Documents complied in all material
respects with the  requirements  of the  Securities Act and the Exchange Act and
the rules and regulations of the Commission promulgated thereunder,  and none of
the SEC Documents, when filed, contained any untrue statement of a material fact
or omitted to state a material fact  required to be stated  therein or necessary
in order to make the statements  therein,  in light of the  circumstances  under
which they were made, not  misleading.  The financial  statements of the Company
included in the SEC Documents  comply in all material  respects with  applicable
accounting  requirements  and the rules and  regulations of the Commission  with
respect thereto. Such financial statements have been prepared in accordance with
United States generally accepted  accounting  principles applied on a consistent
basis during the periods involved,  except as may be otherwise specified in such
financial  statements or the notes  thereto,  and fairly present in all material
respects the financial  position of the Company and the  Subsidiaries  as of and
for the dates  thereof  and the  results  of  operations  and cash flows for the
periods shown, subject, in the case of unaudited statements,  to normal year-end
audit adjustments.  Since the date of the financial  statements  included in the
Company's  last filed  Quarterly  Report on Form 10-Q,  there has been no event,
occurrence  or  development  that  has had or that  could  have or  result  in a
Material Adverse Effect which has not been specifically  disclosed in writing to
the  Purchasers  by the  Company.  



                                       8




The Company last filed audited financial statements with the Commission on April
15,  1997,  and has not received any  comments  from the  Commission  in respect
thereof.

                  (j)  Investment  Company.  The  Company is not,  and is not an
Affiliate  of an  "investment  company"  within the  meaning  of the  Investment
Company Act of 1940, as amended.

                  (k)  Certain  Fees.  Other than fees due and  payable to Smith
Barney,  Inc. as set forth in the engagement letter previously  furnished to the
Purchasers, no fees or commissions will be payable by the Company to any broker,
financial or investment advisor, placement agent finder, investment banker, bank
or  any  other  Person  acting  in  a  similar  capacity  with  respect  to  the
transactions  contemplated  by this  Agreement.  The  Purchasers  shall  have no
obligation with respect to such fees or with respect to any claims made by or on
behalf of other Persons for fees of a type contemplated in this Section that may
be due in connection with the transactions  contemplated by this Agreement.  The
Company  shall  indemnify  and  hold  harmless  each  of the  Purchasers,  their
respective  employees,  officers,  directors,  agents,  and partners,  and their
respective  Affiliates (as such term is defined under Rule 405 promulgated under
the  Securities  Act),  from and  against  all claims,  losses,  damages,  costs
(including the costs of preparation and reasonable attorney's fees) and expenses
suffered in respect of any such claimed or existing fees.

                  (l)   Solicitation   Materials.   The   Company  has  not  (i)
distributed  any offering  materials in connection with the offering and sale of
the Securities  other than the Disclosure  Materials or (ii) solicited any offer
to buy or sell the  Securities by means of any form of general  solicitation  or
advertising.

                  (m) Form S-3 Eligibility.  The Company is, and at each Closing
Date will be,  eligible to register  securities  for resale with the  Commission
under Form S-3 promulgated under the Securities Act.

                  (n)  Exclusivity.  The  Company  shall  not issue and sell the
Convertible  Debentures  to any  Person  other  than the  Purchasers  and  their
respective  Affiliates and managed  funds,  if any, other than with the specific
prior written consent of the Purchasers.

                  (o)  Listing  and  Maintenance  Requirements  Compliance.  The
Company  has not in the two years  preceding  the date hereof  received  written
notice  from any stock  exchange  or market on which the Common  Stock is or has
been  listed (or on which it has been  quoted) to the effect that the Company is
not in compliance with the listing or maintenance  requirements of such exchange
or market.

         2.2      Representations and Warranties of the Purchasers.  Each of the
Purchasers,  severally and not jointly,  hereby  represents  and warrants to the
Company as follows:

                  (a) Organization;  Authority.  Such Purchaser is a corporation
duly incorporated or a limited partnership duly formed,  validly existing and in
good  standing  under  


                                        9






the  laws  of the  jurisdiction  of its  incorporation  or  formation  with  the
requisite  power and authority to enter into and to consummate the  transactions
contemplated  hereby and by the  Registration  Rights Agreement and otherwise to
carry  out its  obligations  hereunder  and  thereunder.  The  purchase  by such
Purchaser  of the  Securities  to be  purchased  by it  hereunder  has been duly
authorized by all necessary  action on the part of such Purchaser.  Each of this
Agreement  and the  Registration  Rights  Agreement  has been duly  executed and
delivered  by such  Purchaser  and  constitutes  the valid and  legally  binding
obligation of such Purchaser,  enforceable against such Purchaser, in accordance
with  its  terms,  subject  to  bankruptcy,   insolvency,  fraudulent  transfer,
reorganization, moratorium and similar laws of general applicability relating to
or affecting creditors' rights generally and to general principles of equity.

                  (b)  Investment  Intent.   Such  Purchaser  is  acquiring  the
Securities  to be purchased by it hereunder  for its own account for  investment
purposes  only  and not with a view to or for  distributing  or  reselling  such
Securities or any part thereof or interest therein, without prejudice,  however,
to such Purchaser's  right,  subject to the provisions of this Agreement and the
Registration Rights Agreement,  at all times to sell or otherwise dispose of all
or any part of such Securities pursuant to an effective  registration  statement
under the Securities Act and in compliance with applicable state securities laws
or under an exemption from such registration.

                  (c) Purchaser  Status.  At the time such Purchaser was offered
the  Convertible  Debentures  and the  Tranche 1 Warrant to be  purchased  by it
hereunder,  it was, and at the date hereof, it is, and at each Closing Date (and
on the  Tranche  2  Closing  Expiration  Date,  if  applicable),  it will be, an
"accredited investor" as defined in Rule 501(a) under the Securities Act.

                  (d) Experience of Purchaser.  Such  Purchaser  either alone or
together  with its  representatives,  has  such  knowledge,  sophistication  and
experience in business and  financial  matters so as to be capable of evaluating
the merits and risks of the prospective investment in the Securities, and has so
evaluated the merits and risks of such investment.

                  (e)  Ability of  Purchaser  to Bear Risk of  Investment.  Such
Purchaser is able to bear the economic risk of an investment in the  Securities,
and, at the present time, is able to afford a complete loss of such  investment.
Such Purchaser has received the Confidential  Private Placement Memorandum dated
July 1, 1997.

                  (f) Access to Information. Each Purchaser acknowledges receipt
of the Disclosure  Materials and further  acknowledges that it has been afforded
(i) the opportunity to ask such questions as it has deemed  necessary of, and to
receive answers from,  representatives  of the Company  concerning the terms and
conditions  of the  offering  of the  Securities,  and the  merits  and risks of
investing in the  Securities;  (ii) access to information  about the Company and
the Company's financial condition, results of operations,  business, properties,
management and prospects sufficient to enable it to evaluate its investment; and
(iii) the  opportunity to obtain such additional  information  which the Company
possesses  or can  acquire  



                                       10





without unreasonable effort or expense that such Purchaser believes is necessary
to make an informed  investment  decision with respect to the  investment and to
verify  the  accuracy  and  completeness  of the  information  contained  in the
Disclosure Materials.

                  (g) Reliance. Each Purchaser understands and acknowledges that
(i) the  Convertible  Debentures and the Warrants to be sold to it hereunder are
being  offered  and sold to it in a private  placement  that is exempt  from the
registration  requirements  of the Securities Act and (ii) the  availability  of
such  exemption  depends in part on and the Company  will rely upon the accuracy
and  truthfulness  of, the foregoing  representations  and such Purchaser hereby
consents to such reliance.

                  The Company  acknowledges  and agrees that the Purchasers make
no representations  or warranties with respect to the transactions  contemplated
hereby other than those specifically set forth in this Section 2.2.


                                   ARTICLE III

                         OTHER AGREEMENTS OF THE PARTIES

         3.1      Transfer  Restrictions.  (a) If any Purchaser should decide to
dispose  of any  portion  of the  Securities  held by it,  each  such  Purchaser
understands  and  agrees  that  it  may  do so  only  pursuant  to an  effective
registration  statement  under the Securities Act, to the Company or pursuant to
an available exemption from the registration requirements thereof. In connection
with any  transfer of any portion of the  Securities  other than  pursuant to an
effective registration statement or to the Company, the transferor shall provide
notice thereof to the Company who may require the transferor  thereof to provide
to the Company an opinion of counsel  experienced  in the area of United  States
securities  laws  selected by the  transferor,  the form and  substance of which
opinion shall be reasonably satisfactory to the Company, to the effect that such
transfer does not require registration of such transferred  Securities under the
Securities Act.

                  (b)      Each Purchaser  agrees to the imprinting,  so long as
is required by this Section 3.1(b), of the following legend on the Securities:

                  NEITHER THESE  SECURITIES NOR THE SECURITIES  INTO WHICH THESE
         SECURITIES ARE  [CONVERTIBLE]  [EXERCISABLE]  HAVE BEEN REGISTERED WITH
         THE UNITED STATES SECURITIES AND EXCHANGE  COMMISSION OR THE SECURITIES
         COMMISSION OF ANY STATE IN RELIANCE UPON AN EXEMPTION FROM REGISTRATION
         UNDER THE  SECURITIES ACT OF 1933, AS AMENDED (THE  "SECURITIES  ACT"),
         AND,  ACCORDINGLY,  MAY NOT BE OFFERED OR SOLD  EXCEPT  PURSUANT  TO AN
         EFFECTIVE  REGISTRATION  STATEMENT UNDER THE SECURITIES ACT OR PURSUANT
         TO AN AVAILABLE EXEMPTION FROM, OR IN A TRANSACTION NOT SUBJECT TO, THE
         REGISTRATION  REQUIREMENTS OF 



                                       11




         THE SECURITIES ACT AND IN ACCORDANCE WITH APPLICABLE  STATE  SECURITIES
         LAWS.

         [FOR CONVERTIBLE DEBENTURES ONLY] THIS CONVERTIBLE DEBENTURE IS SUBJECT
         TO CERTAIN  RESTRICTIONS  ON TRANSFER  AND  CONVERSIONS  SET FORTH IN A
         CONVERTIBLE  DEBENTURE PURCHASE  AGREEMENT,  DATED AS OF JULY 17, 1997,
         EXECUTED BY THE ORIGINAL HOLDER HEREOF.  A COPY OF THAT AGREEMENT IS ON
         FILE AT THE PRINCIPAL OFFICE OF PLC SYSTEMS INC.

                  The  Underlying  Shares shall not contain the legend set forth
above (or any other  legend) if the  conversion  of  Convertible  Debentures  or
exercise of  Warrants,  as the case may be,  pursuant  to which such  Underlying
Shares  are to be issued  occurs at any time  while  the  Underlying  Securities
Registration  Statement is effective  under the  Securities  Act or in the event
there is not an effective Underlying Securities  Registration  Statement at such
time,  if in the  opinion of counsel to the Company  experienced  in the area of
United  States  securities  laws such legend is not  required  under  applicable
requirements  of the  Securities  Act (including  judicial  interpretations  and
pronouncements  issued by the Staff of the Commission).  The Company agrees that
it will provide the Purchaser,  upon request, with a certificate or certificates
representing  Underlying  Shares,  free  from any  legend  at such  time as such
legends are no longer required pursuant to this Section.

         3.2      Stop  Transfer  Instruction.  The  Company  may not  make  any
notation  on its  records  or give  instructions  to any  transfer  agent of the
Company which enlarge the restrictions of transfer set forth in Section 3.1.

         3.3      Furnishing  of  Information.  As  long as any  Purchaser  owns
Underlying Shares, the Company covenants to timely file (or obtain extensions in
respect  thereof) all reports required to be filed by the Company after the date
hereof pursuant to Section 13(a) or 15(d) of the Exchange Act. If the Company is
not at the time  required to file  reports  pursuant to such  sections,  it will
prepare and furnish to the Purchasers and make publicly  available in accordance
with Rule  144(c)  promulgated  under the  Securities  Act annual and  quarterly
financial statements,  together with a discussion and analysis of such financial
statements  in form and  substance  substantially  similar  to those  that would
otherwise  be required to be  included in reports  required by Section  13(a) or
15(d) of the Exchange Act, as well as any other information required thereby, in
the time period  that such  filings  would have been  required to have been made
under the Exchange Act.

         3.4      Copies and Use of Disclosure  Materials.  The Company consents
to the use of the  Disclosure  Materials,  and any  amendments  and  supplements
thereto,  by the Purchasers in connection with resales of Securities  other than
pursuant to an effective Underlying Securities Registration Statement.

         3.5      Blue Sky Laws.  In  accordance  with the  Registration  Rights
Agreement,  the Company shall qualify the Underlying Shares under the securities
or Blue Sky laws of such  


                                       12




jurisdictions  as any Purchaser may  reasonably  request and shall continue such
qualification  at all times  through the third  anniversary  of the last Closing
Date; provided,  however, that neither the Company nor its Subsidiaries shall be
required in connection  therewith to qualify as a foreign corporation where they
are not now so qualified or to take any action that would subject the Company to
general  service  of process  in any such  jurisdiction  where it is not then so
subject.

         3.6      Integration.  The  Company  shall  not and  shall use its best
efforts to ensure that no Affiliate of the Company shall sell, offer for sale or
solicit  offers to buy or  otherwise  negotiate  in respect of any  security (as
defined in Section 2 of the  Securities  Act) that would be integrated  with the
offer or sale of the Securities in a manner that would require the  registration
under the  Securities  Act of the issue or sale of any of the  Securities to any
Purchaser.

         3.7      Purchaser  Ownership of Common Stock. No Purchaser may use its
ability  to  convert  Convertible  Debentures  hereunder  or use its  ability to
acquire  shares of Common Stock upon exercise of the Warrants to the extent that
such conversion or exercise would result in such Purchaser  beneficially  owning
(for  purposes  of Rule 13d-3  under the  Exchange  Act) more than 4.999% of the
outstanding shares of the Common Stock;  provided,  however,  that (i) if (A) an
"Event of Default" (as defined in the Convertible Debentures) is declared by any
Purchaser  or  (B)  the  Company  defaults  in  the  performance  of  any of its
obligations  under any  Transaction  Document  and (ii) if ten days  shall  have
elapsed  since any  Purchaser  shall have  notified the Company of such Event of
Default or default and, (in the case of such  default  only) such default  shall
not have been cured to such Purchaser's satisfaction during such ten-day period,
then the  provisions  of this  Section  3.7  shall  be null and void ab  initio.
Notwithstanding  anything to the contrary  contained  herein,  the provisions of
this  Section  3.7 shall  have no effect on the  Company's  obligation  to issue
shares of  Common  Stock to the  Purchasers  upon  receipt  or  delivery  of any
conversion or exercise notice.

         3.8      Listing and Reservation of Underlying  Shares. (a) The Company
shall (a) not later than the fifth  Business  Day  following  (i) the  Tranche 1
Closing Date prepare and file with the American  Stock  Exchange (as well as any
other national  securities  exchange or market on which the Common Stock is then
listed or traded) an additional shares listing application covering at least the
sum of 1,065,000  Underlying  Shares (comprised of 1,000,000 shares reserved for
issuance  upon  conversion  of Tranche 1 Debentures  and the payment of interest
thereon,  subject to Section  2.1(d)  herein,  and 65,000  shares  reserved  for
issuance  upon  exercise of Tranche 1 Warrants);  and (ii) the Tranche 2 Closing
Date  prepare  and  file  with the  American  Stock  Exchange  (as well as other
national  securities exchange or market in which the Common Stock is then listed
or traded) an additional shares listing application covering at least the sum of
(1)  145% of the  number  of  Underlying  Shares  as would  be  issuable  upon a
conversion in all of the Tranche 2 Debentures  including  interest  thereon (but
not penalty interest,  for which the Company shall reserve  additional  shares),
assuming such  conversion  occurred on the Original Issue Date for the Tranche 2
Debentures  and (2) the number of  Underlying  Shares  issuable upon exercise in
full of the  Tranche 2  Warrants;  (b) take all steps  necessary  to cause  such
shares to be approved for listing in the American  Stock Exchange (as 



                                       13





well as on any other national  securities exchange or market on which the Common
Stock is then  listed) as soon as  possible  thereafter;  and (c) provide to the
Purchasers evidence of such listing,  and the Company shall maintain the listing
of its Common Stock on such  exchange.  If the Tranche 2 Warrants are issued and
delivered on or after the Tranche 2 Closing  Expiration  Date, the Company shall
(not  later  than  five  Business  Days  thereafter)  prepare  and file with the
American Stock Exchange (as well as any other  national  securities  exchange or
market on which the Common Stock is then listed or traded) an additional  shares
listing  application  covering the number of  Underlying  Shares  issuable  upon
exercise  in full of the  Tranche 2 Warrants,  and take all steps  necessary  to
cause  such  shares to be  approved  for  listing  thereon  as soon as  possible
thereafter.

                  (b) The Company shall reserve for issuance upon  conversion of
the  Convertible  Debentures,  for  payment of interest  thereupon  in shares of
Common Stock pursuant to the terms thereof, and upon exercise of the Warrants in
accordance  with their  terms the number of shares to be listed on the  American
Stock Exchange (and such other national  securities  exchange or market on which
the Common  Stock is then  listed or  traded)  as set forth in  Section  3.8(a).
Shares  of  Common  Stock  reserved  for  issuance  upon the  conversion  of the
Convertible  Debentures  as  set  forth  in  Section  3.8(a)(i)(1)  and  Section
3.8(a)(ii)(1),  as the case may be, shall be  allocated  pro rata to each of the
Purchasers in accordance  with the principal  amount of  Convertible  Debentures
issued and delivered to such  Purchaser at the Tranche 1 Closing or the Trance 2
Closing, as applicable.

         3.9      Conversion  Procedures.  Exhibit D attached  hereto sets forth
the  procedures  with respect to the conversion of the  Convertible  Debentures,
including  the  forms of  conversion  notice  to be  provided  upon  conversion,
instructions as to the procedures for conversion,  the form of legal opinion, if
necessary,  that  shall  be  rendered  by or on  behalf  of the  Company  to the
Company's  transfer agent and such other  information and instructions as may be
reasonably  necessary  to enable  the  Purchasers  to  exercise  their  right of
conversion smoothly and expeditiously.

         3.10     Purchasers'  Rights if Trading in Common Stock Is Suspended or
Delisted.  If at any time while any Purchaser (or any assignee thereof) owns any
Securities trading in the shares of the Common Stock is suspended on or delisted
from the American Stock Exchange or any other  principal  market or exchange for
such shares  (other than as a result of the  suspension of trading in securities
on such  market or  exchange  generally  or  temporary  suspensions  pending the
release of material information) for more than three Trading Days, at the option
of any Purchaser  exercisable by written notice to the Company  delivered within
60 days of notice of such  suspension or  delisting,  the Company shall repay in
cash the entire principal amount of then outstanding Convertible Debentures held
by such Purchaser and redeem all then outstanding Underlying Shares then held by
such  Purchaser in cash, at an aggregate  purchase price equal to the sum of (I)
the aggregate outstanding  principal amount of Convertible  Debentures then held
by such  Purchaser  multiplied by (1) the average Per Share Market Value for the
five (5) Trading Days  immediately  preceding  (a) the day of such notice or (b)
the date of  payment  in full of the  repurchase  price  calculated  under  this
Section,  whichever is greater,  divided by (2) the Conversion Price on the date
of the repurchase notice,  


                                       14






(II) the  aggregate of all accrued but unpaid  interest and other  non-principal
amounts  then  payable in respect of all  Convertible  Debentures  to be repaid,
(III) the number of Underlying Shares then held by such Purchaser  multiplied by
the average Per Share  Market  Value for the five (5) Trading  Days  immediately
preceding  (A) the date of the  notice or (B) the date of payment in full by the
Company of the  repurchase  price  calculated  under this Section,  whichever is
greater,  and (IV)  interest on the amounts set forth in I - III above  accruing
from the 5th day after such notice until the repurchase price under this Section
is paid in full at the rate of 15% per annum.  The Company shall provide written
notice of any  prepayment  demand made  pursuant  to this  Section to each other
holder of Securities within 24 hours of its receipt thereof.

         3.11     No Violation of Applicable Law.  Notwithstanding any provision
of this Agreement to the contrary,  if the repurchase of Convertible  Debentures
and/or redemption of Underlying  Shares otherwise  required under this Agreement
would be prohibited by applicable law, such repurchase shall be effected as soon
as it is permitted under such law; provided,  however,  that interest payable by
the Company with respect to any such repurchase and/or redemption shall continue
to accrue in accordance with Section 3.10.

         3.12     [INTENTIONALLY OMITTED]

         3.13     Use of Proceeds. The Company shall use all of the net proceeds
from the placement of the  Securities for working  capital  purposes and not for
the satisfaction of any portion of Company or Subsidiary debt, to redeem Company
equity or equity-equivalent securities or to pay down in excess of $1,000,000 of
trade accounts payable of the Company or any Subsidiary.  Pending application of
the proceeds of this placement in the manner  permitted  hereby the Company will
invest such proceeds in interest  bearing  accounts and  short-term,  investment
grade interest bearing securities.

         3.14     Notice of Breaches. (a) Each of the Company and each Purchaser
shall  give  prompt   written   notice  to  the  other  of  any  breach  of  any
representation,  warranty or other  agreement  contained in this Agreement or in
the Registration Rights Agreement,  as well as any events or occurrences arising
after the date hereof and prior to, with  respect to the Tranche 1 Closing,  the
Tranche 1 Closing  Date with  respect to the  Tranche 2 Closing,  the  Tranche 2
Closing Date which would  reasonably  be likely to cause any  representation  or
warranty or other agreement of such party, as the case may be,  contained herein
to be incorrect or breached as of such Closing Date. The Company shall give such
notice to each  Purchaser.  However,  no disclosure by either party  pursuant to
this Section shall be deemed to cure any breach of any representation,  warranty
or other agreement contained herein or in the Registration Rights Agreement, and
no such  disclosure by any Purchaser  shall affect the rights of and obligations
owing to the nondisclosing Purchasers under the Transaction Documents.

                  (b)  Notwithstanding  the generality of Section  3.14(a),  the
Company shall promptly  notify each Purchaser of any notice or claim (written or
oral) that it  receives  from any lender of the  Company to the effect  that the
consummation of the  transactions  contemplated  hereby and by the  Registration
Rights   Agreement   violates  or  would   violate  any  


                                       15




written agreement or understanding  between such lender and the Company, and the
Company shall  promptly  furnish by facsimile to the holders of the  Convertible
Debentures  a copy of any  written  statement  in support of or relating to such
claim or notice.

                  (c) The default by any  Purchaser  of any of its  obligations,
representations  or  warranties  under  any  Transaction  Document  shall not be
imputed to, and shall have no effect  upon,  any other  Purchaser  or affect the
Company's  obligations  under the  Transaction  Documents to any  non-defaulting
Purchaser.

         3.15     Conversion  Obligations of the Company.  The Company covenants
to honor  conversions of Convertible  Debentures and exercise of Warrants and to
deliver  Underlying  Shares in accordance with the terms and conditions and time
period set forth in the respective Convertible Debentures and Warrants.

         3.16     Right  of First  Refusal;  Subsequent  Registrations;  Certain
Company Actions. (a) The Company shall not, directly or indirectly,  without the
prior written  consent of Brown Simpson,  LLC ("Brown  Simpson"),  offer,  sell,
grant any option to purchase, or otherwise dispose (or announce any offer, sale,
grant or any  option  to  purchase  or other  disposition)  of any of its or its
Affiliates  equity or  equity-equivalent  securities  at a price which is on the
face  thereof  or implied  therein,  less than  either the market  price or fair
market value for such securities (a "Subsequent  Financing") for a period of 100
days after the last to occur of the  Tranche 1 Closing  Date,  Tranche 2 Closing
Date or Tranche 2 Closing Expiration Date, except (i) the granting of options to
employees,  officers and directors,  and the issuance of shares upon exercise of
options  granted,  under any stock option plan  heretofore or  hereinafter  duly
adopted by the  Company,  (ii)  shares  issued upon  exercise  of any  currently
outstanding options and to the extent disclosed in Schedule 2.1(a), (iii) shares
of Common Stock issued upon conversion of Convertible Debentures and exercise of
Warrants,  (iv)  shares  issued or issuable in  connection  with any  registered
primary public offering of the Company's  securities,  (v) any securities issued
or  issuable to any entity  acquired by the Company in a merger,  stock or asset
acquisition or similar transaction, or (vi) any securities issued by the Company
in connection with any technology  transfer or license agreement or marketing or
similar  joint  venture  agreement,  unless (A) the  Company  delivers  to Brown
Simpson a written notice (the "Subsequent Financing Notice") of its intention to
effect such  Subsequent  Financing,  which  Subsequent  Financing  Notice  shall
describe in reasonable  detail the proposed terms of such Subsequent  Financing,
the amount of proceeds  intended to be raised  thereunder,  the Person with whom
such  Subsequent  Financing  shall be  affected,  and a term  sheet  or  similar
document relating thereto (which shall be attached to such Subsequent  Financing
Notice) and (B) Brown  Simpson  shall not have notified the Company by 5:00 p.m.
(Eastern  Time) on the fifth  Business  Day after its receipt of the  Subsequent
Financing Notice of its willingness to provide (or to cause its sole designee to
provide) such  Subsequent  Financing,  subject to completion and  negotiation of
definitive  documentation  therefor, on substantially the terms set forth in the
Subsequent Financing Notice. If Brown Simpson does not notify the Company of its
intention  to provide such  Subsequent  Financing  within such time period,  the
Company may effect the Subsequent Financing  substantially upon the terms and to
the  Persons  (or  Affiliates  of such  Persons)  set  forth  in the  Subsequent
Financing Notice;  provided, that the Company shall 


                                       16





provide  Brown  Simpson with a second  Subsequent  Financing  Notice,  and Brown
Simpson  shall  again have the right of first  refusal  set forth  above in this
Section 3.16(a),  if the Subsequent  Financing subject to the initial Subsequent
Financing Notice shall not have been consummated for any reason on the terms set
forth in such Subsequent Financing Notice within 60 Business Days after the date
of the initial  Subsequent  Financing Notice with the Person (or an Affiliate of
such Person) identified in the Subsequent Financing Notice.

                  (b)  Other  than  Underlying  Shares  and  other  "Registrable
Securities" (as defined in the Registration  Rights  Agreement) to be registered
in accordance with the Registration  Rights Agreement,  the Company shall, for a
period  of not less than 90  Trading  Days  after  the date that the  Underlying
Shares Registration Statement relating to the securities issued at last to occur
of the  Tranche 1 Closing  Date,  Tranche  2 Closing  Date or  Tranche 2 Closing
Expiration Date is declared effective by the Commission,  not, without the prior
written  consent  of  Purchasers,  (i)  issue  or sell  any of its or any of its
Affiliates'  equity or  equity-equivalent  securities  pursuant to  Regulation S
promulgated under the Securities Act, or (ii) register for resale any securities
of the Company.  Any days that any Purchaser is unable to sell Underlying Shares
under an Underlying Securities  Registration Statement shall be added to such 90
Trading Day period for the purposes of (i) and (ii) above.

                  (c) As long as there are Convertible  Debentures  outstanding,
the  Company  shall not and shall  cause the  Subsidiaries  not to,  without the
consent of Purchasers,  (i) amend its  certificate of  incorporation,  bylaws or
other charter  documents so as to adversely affect any rights of the Purchasers;
(ii) repay, repurchase or offer to repay, repurchase or otherwise acquire shares
of its Common  Stock  (except  Underlying  Shares and  shares  repurchased  from
employees of the Company upon their  termination of employment  with the Company
not in excess of  $1,000,000  in  aggregate);  or (iii) enter into any agreement
with respect to any of the foregoing.  Any repurchase of Convertible  Debentures
or Underlying Shares must be offered pro rata among the Purchasers in accordance
with their then held respective principal amount of Convertible Debentures.

         3.17 The Warrants. (a) At the Tranche 1 Closing the Company shall issue
and deliver (i) to Southbrook,  a Common Stock purchase  warrant (the "Tranche 1
Southbrook  Warrant")  entitling  Southbrook  to  purchase,  on  the  terms  and
conditions set forth therein, 32,500 shares of Common Stock at a price per share
equal to the Tranche 1 Warrant  Exercise Price (as defined  below);  (ii) to HBK
Cayman,  a Common Stock  purchase  warrant (the "Tranche 1 HBK Cayman  Warrant")
entitling HBK Cayman to purchase, on the terms and conditions set forth therein,
16,250  shares of  Common  Stock at a price  per  share  equal to the  Tranche 1
Warrant  Exercise  Price;  and (iii) to HBK  Offshore,  a Common Stock  purchase
warrant (the "Tranche 1 HBK Offshore  Warrant," and together with the Southbrook
Tranche  1  Warrant  and the HBK  Cayman  Tranche  1  Warrant,  the  "Tranche  1
Warrants")  entitling HBK Offshore to purchase,  on the terms and conditions set
forth  therein,  16,250  shares of Common  Stock at an exercise  price per share
equal to the Tranche 1 Warrant  Exercise Price.  The "Tranche 1 Warrant Exercise
Price"  shall be equal to 125% of the Per Share  Market  Value on the  Tranche 1
Closing Date.


                                       17



                  (b) At the earlier to occur of the  Tranche 2 Closing  Date or
the Tranche 2 Closing  Expiration  Date, the Company shall issue and deliver (i)
to Southbrook, a Common Stock purchase warrant entitling Southbrook to purchase,
on the terms and  conditions  set  forth  therein,  a number of shares of Common
Stock equal to (A) if the Tranche 2 Warrants are issued on the Tranche 2 Closing
Date,  7.5% of the  purchase  price to be paid by  Southbrook  for the Tranche 2
Debentures to be issued and sold to it at the Tranche 2 Closing (e.g.,  if it is
to pay  $5,000,000  for Tranche 2  Debentures,  then such number shall be 32,500
shares) or (B) if the Tranche 2 Warrants  are to be issued and  delivered on the
Tranche 2 Closing  Expiration  Date, the number of shares to which the Tranche 1
Southbrook Warrant entitled  Southbrook to purchase,  at a price per share equal
to the Tranche 2 Warrant Exercise Price (as defined below);  (ii) to HBK Cayman,
a Common Stock purchase warrant  entitling HBK Cayman to purchase,  on the terms
and conditions  set forth  therein,  a number of shares of Common Stock equal to
(A) if the Tranche 2 Warrants are issued and  delivered on the Tranche 2 Closing
Date,  7.5% of the  purchase  price to be paid by HBK Cayman  for the  Tranche 2
Debentures to be issued and sold to it at the Tranche 2 Closing (e.g.,  if it is
to pay  $2,500,000  for Tranche 2  Debentures,  then such number shall be 16,250
shares) or (B) if the Tranche 2 Warrants  are to be issued and  delivered on the
Tranche 2 Closing  Expiration  Date, the number of Shares to which the Tranche 1
HBK Cayman Warrant  entitled HBK Cayman to purchase,  at a price per share equal
to the Tranche 2 Warrant  Exercise  Price;  and (iii) to HBK Offshore,  a Common
Stock  purchase  warrant  entitling  HBK Offshore to purchase,  on the terms and
conditions set forth therein, a number of shares of Common Stock equal to (A) if
the  Tranche 2 Warrants  are issued on the Tranche 2 Closing  Date,  7.5% of the
purchase  price to be paid by HBK Offshore  for the Tranche 2  Debentures  to be
issued and sold to it at the Tranche 2 Closing (e.g., if it is to pay $2,500,000
for Tranche 2 Debentures, then such number shall be 16,250 shares) or (B) if the
Tranche 2  Warrants  are to be issued  and  delivered  on the  Tranche 2 Closing
Expiration Date, the number to which the Tranche 1 HBK Offshore Warrant entitled
HBK  Offshore to  purchase,  at a price per share equal to the Tranche 2 Warrant
Exercise  Price.  The "Tranche 2 Warrant  Exercise Price" shall equal (a) if the
Tranche 2 Warrants are issued and delivered on the Tranche 2 Closing Date,  125%
of the Per Share  Market Value on such date or (b) if the Tranche 2 Warrants are
to be issued and delivered on the Tranche 2 Closing Expiration Date, 125% of the
Per  Share  Market  Value on such  date.  The  Common  stock  purchase  Warrants
described in this paragraph are collectively  referred to herein as the "Tranche
2  Warrants,  and  the  Tranche  1  Warrants  and the  Tranche  2  Warrants  are
collectively referred to herein as the "Warrants."

                  (c) The Warrants shall be substantially in the form of Exhibit
D. The failure of a Tranche 2 Closing  with  respect to any  Purchaser  due to a
failure  by the  Company to timely  deliver a  Subsequent  Tranche  Notice or to
satisfy  all of the  conditions  set forth in  section  4.1 shall not affect the
Company's  obligation  to issue and deliver  Tranche 2 Warrants on the Tranche 2
Closing Expiration Date.

         3.18  Transactions  in  the  Common  Stock.  The  Purchasers  will  not
establish a short  position in the Common  Stock during the fifteen (15) Trading
Days after  receipt of a  Subsequent  Funding  Notice and prior to the Tranche 2
Closing Date. Any existing short position may be maintained.


                                       18







         3.19  Limiting  Agreements.  So  long  as  Convertible  Debentures  are
outstanding,   the  Company  will  not  enter  into  a  contract,  agreement  or
understanding  that would  restrict  the  Company's  ability  to pay  principal,
interest,  liquidated  damages or penalty  interest  pursuant to any Transaction
Documents.

                                   ARTICLE IV

                                   CONDITIONS

         4.1  Conditions  Precedent  to  the  Obligation  of the  Purchasers  to
Purchase the Tranche 2 Debentures. The obligation of each Purchaser hereunder to
acquire  and pay for  Tranche 2  Debentures  is subject to the  satisfaction  or
waiver by such  Purchaser  at or  before  the  Tranche 2 Closing  of each of the
following conditions:

                  (a)  Tranche 1  Closing.  The  Tranche 1  Closing  shall  have
occurred. 

                  (b) Accuracy of the Company's  Representations and Warranties.
The representations and warranties of the Company contained herein shall be true
and  correct  in all  material  respects  as of the date when made and as of the
Tranche 2 Closing Date as though made on and as of such date;

                  (c)  Performance  by  the  Company.  The  Company  shall  have
performed,  satisfied and complied in all material  respects with all covenants,
agreements and conditions required by the Transaction Documents to be performed,
satisfied  or complied  with by the Company at or prior to the Tranche 2 Closing
Date;

                  (d)  Underlying  Securities   Registration   Statements.   The
Underlying  Securities  Registration  Statement  with respect to the  Underlying
Shares  issuable  on  conversion  and  exercise  of all  outstanding  Tranche  1
Debentures and Tranche 1 Warrants shall have been declared  effective  under the
Securities  Act by the  Commission and such  Underlying  Registration  Statement
shall have remained  effective and shall not be subject to any stop order and no
stop order shall be pending or threatened as at the Tranche 2 Closing Date;

                  (e) No Injunction.  No statute,  rule,  regulation,  executive
order,  decree,   ruling  or  injunction  shall  have  been  enacted,   entered,
promulgated or endorsed by any court or  governmental  authority which prohibits
the  consummation of any of the  transactions  contemplated by this Agreement or
the Registration  Rights Agreement relating to the issuance or conversion of any
of the Securities.

                  (f)  Management.  Dr.  Robert I. Rudko shall not have left the
Company  or  suffered  a  voluntary  or   involuntary   material   lessening  of
responsibility as Chairman, the Purchasers acknowledging the Company's intention
to hire a President and/or Chief Executive Officer.


                                       19





                  (g) No Suspensions of Trading in Common Stock.  The trading in
the Common  Stock  shall not have been  suspended  by the  Commission  or on the
American  Stock  Exchange  (except  for any  suspension  of  trading  of limited
duration solely to permit  dissemination of material  information  regarding the
Company and except if, at the time there is any suspension on the American Stock
Exchange,  the Common  Stock is then listed and  approved for trading on the New
York Stock Exchange, Nasdaq National Market or Nasdaq SmallCap Market within one
(1) Trading Day thereof);

                  (h) Listing of Common Stock.  The Common Stock shall have been
at all times  between the Tranche 1 Closing Date and the Tranche 2 Closing Date,
and on the Tranche 2 Closing  Date shall be,  listed for trading on the American
Stock  Exchange,  New York  Stock  Exchange,  Nasdaq  National  Market or Nasdaq
SmallCap Market.

                  (i) Change of  Control.  No Change of  Control in the  Company
shall have occurred since the Tranche 1 Closing Date.  "Change of Control" means
the  occurrence  of any of  (i) an  acquisition  after  the  date  hereof  by an
individual, group (as defined in Rule 13d-1 promulgated under the Exchange Act),
or legal  entity of in excess of 30% of the voting  securities  of the  Company,
(ii) a replacement  of more than one-half of the members of the Company's  board
of directors  which is not approved by those  individuals who are members of the
board  of  directors  on  the  date  hereof  in  one  or  a  series  of  related
transactions,  (iii) the  merger of the  Company  with or into  another  entity,
consolidation or sale of all or  substantially  all of the assets of the Company
in one or a series of related  transactions or (iv) the execution by the Company
of an  agreement  to which  the  Company  is a party  or by  which it is  bound,
providing for any of the events set forth above in (i), (ii) or (iii).

                  (j) Legal  Opinion.  The Company shall have  delivered to such
Purchaser an opinion of outside  legal  counsel to the Company in  substantially
the forms attached hereto as Exhibit E and dated the Tranche 2 Closing Date;

                  (k) Required Approvals. All Required Approvals shall have been
obtained;

                  (l) Shares of Common Stock.  On the Tranche 2 Closing Date the
Company shall have reserved for issuance to the  Purchasers the number of shares
of Common Stock specified in Section 3.8(a)(ii);

                  (m) Delivery of  Securities.  The Company shall have delivered
to Robinson Silverman (or such other Person acceptable to such Purchaser and the
Company) in escrow pending the Tranche 2 Closing the Convertible  Debentures and
Tranche 2 Warrants being  purchased at the Tranche 2 Closing by such  Purchaser,
registered in the name of such Purchaser,  each in form satisfactory to Robinson
Silverman (or such other Person);

                  (n)  Performance  of  Conversion/Exercise   Obligations.   The
Company shall have (a) delivered  Underlying Shares upon conversion of Tranche 1
Convertible  Debentures  and  exercise  of  Tranche  1  Warrants  and  otherwise
performed its  obligations in accordance  with 


                                       20






the terms,  conditions  and timing  requirements  of the  Tranche 1  Convertible
Debentures and Tranche 1 Warrants; and

                  (o) Market  Price of Common  Stock.  The closing sale price of
the  Common  Stock as  reported  by the  American  Stock  Exchange  or any other
exchange or market on which the Common  Stock is then  listed  shall be at least
$10 per share for each of the fifteen (15) Trading  Days  immediately  preceding
each of the date of  Subsequent  Tranche  Notice and the Tranche 2 Closing Date,
provided that all material  information  regarding the Company has been publicly
disseminated  on a timely  basis,  whether or not the  Company  has a duty under
federal securities laws to disclose such information.

                                     ARTICLE

                                  MISCELLANEOUS

         5.1 Fees and  Expenses.  Each party shall pay the fees and  expenses of
its advisers,  counsel,  accountants  and other  experts,  if any, and all other
expenses  incurred  by such  party  incident  to the  negotiation,  preparation,
execution,  delivery and performance of this  Agreement,  except as set forth in
the  Registration  Rights  Agreement.  The Company shall pay all stamp and other
taxes and duties levied in connection  with the issuance of the Shares  pursuant
hereto.

         5.2 Entire  Agreement;  Amendments.  This Agreement,  together with the
Exhibits  and  Schedules  hereto,   the  Registration   Rights  Agreement,   the
Convertible Debentures, the Warrants and the document, if any, setting forth the
terms  of  the  preferred  stock  into  which  the  Convertible  Debentures  are
exchangeable  as provided under the Convertible  Debentures,  contain the entire
understanding  of the  parties  with  respect to the subject  matter  hereof and
supersede all prior agreements and understandings, oral or written, with respect
to such matters.

         5.3 Notices.  Any and all notices or other communications or deliveries
required or permitted to be provided  hereunder shall be in writing and shall be
deemed given and effective on the earliest of (i) the date of  transmission,  if
such  notice or  communication  is  delivered  via  facsimile  at the  facsimile
telephone  number  specified in this Section  prior to 4:30 p.m.  (New York City
time) on a Business Day,  (ii) the Business Day after the date of  transmission,
if such notice or  communication  is delivered  via  facsimile at the  facsimile
telephone number  specified in the Purchase  Agreement later than 4:30 p.m. (New
York City time) on any date and earlier than 11:59 p.m.  (New York City time) on
such date,  (iii) the Business  Day  following  the date of mailing,  if sent by
nationally  recognized overnight courier service, or (iv) upon actual receipt by
the party to whom such  notice is  required  to be given.  The  address for such
notices and communications shall be as follows:

         If to the Company:         PLC Systems Inc.
                                    10 Forge Park
                                    Franklin, MA  02038


                                       21




                                    Attn:  Chief Executive Officer
                                    Facsimile No.:  (508) 581-7990

         With copies to:            Mintz, Levin, Cohn, Ferris, Glovsky
                                      and Popeo, P.C.
                                    One Financial Center
                                    Boston, MA  02111
                                    Attn:  Neil H. Aronson
                                    Facsimile No.:  (617) 542-2241

         If to the Southbrook:      Southbrook International
                                      Investments, Ltd.
                                    c/o Trippoak Advisors, Inc.
                                    630 Fifth Avenue, Suite 2000
                                    New York, NY  10111
                                    Facsimile No.:  (212) 332-3256
                                    Attn:  Robert L. Miller

         If to HBK Cayman:          HBK Cayman L.P.
                                    c/o HBK Investments L.P.
                                    777 Main Street, Suite 2750
                                    Forth Worth, TX  76102
                                    Facsimile No.:  (817) 870-6234
                                    Attn:  David C. Haley and Michael Reese

         If to HBK Offshore:        HBK Offshore Fund Ltd.
                                    c/o HBK Investments L.P.
                                    777 Main Street, Suite 2750
                                    Forth Worth, TX  76102
                                    Facsimile No.:  (817) 870-6234
                                    Attn:  David C. Haley and Michael Reese

         With copies
         in the case of
         Southbrook, HBK
         Cayman, and HBK
         Offshore to:               Robinson Silverman Pearce
                                      Aronsohn & Berman LLP
                                    1290 Avenue of the Americas
                                    New York, NY  10104
                                    Attn:  Eric L. Cohen
                                    Fax:  (212) 541-4630



                                       22






or such other  address as may be designated  in writing  hereafter,  in the same
manner, by such person.

         5.4 Amendments;  Waivers.  No provision of this Agreement may be waived
or amended except in a written  instrument  signed, in the case of an amendment,
by both the Company and each of the Purchasers;  or, in the case of a waiver, by
the party against whom  enforcement  of any such waiver is sought.  No waiver of
any default with respect to any  provision,  condition  or  requirement  of this
Agreement shall be deemed to be a continuing waiver in the future or a waiver of
any other  provision,  condition or requirement  hereof,  nor shall any delay or
omission of either  party to exercise any right  hereunder in any manner  impair
the exercise of any such right accruing to it thereafter.

         5.5  Headings.  The headings  herein are for  convenience  only, do not
constitute a part of this  Agreement  and shall not be deemed to limit or affect
any of the provisions hereof.

         5.6  Successors and Assigns.  This Agreement  shall be binding upon and
inure to the benefit of the parties and their successors and permitted  assigns.
The Company may not assign this Agreement or any rights or obligations hereunder
without the prior written  consent of each of the  Purchasers.  No Purchaser may
assign this Agreement or any rights or obligations  hereunder  without the prior
written consent of the Company,  except that any Purchaser may assign its rights
hereunder and under the Transaction Documents without the consent of the Company
as long as such assignee  demonstrates  to the  reasonable  satisfaction  of the
Company its  satisfaction  of the  representations  and  warranties set forth in
Section 2.2.  This  provision  shall not limit a  Purchaser's  right to transfer
securities  or transfer or assign  rights  hereunder  or under the  Registration
Rights Agreement.

         5.7 No  Third-Party  Beneficiaries.  This Agreement is intended for the
benefit of the parties  hereto and their  respective  permitted  successors  and
assigns and, other than with respect to Section 3.16,  which is intended for the
benefit of and which may be enforced by Brown Simpson,  LLC, and with respect to
permitted  assignees  under  Section 5.6, is not for the benefit of, nor may any
provision hereof be enforced by, any other Person.

         5.8 Governing  Law. This  Agreement  shall be governed by and construed
and  enforced  in  accordance  with the  internal  laws of the State of New York
without regard to the principles of conflicts of law thereof.

         5.9 Survival. The agreements and covenants contained in Article III, IV
and this Article V shall survive the delivery and conversion of the  Convertible
Debentures  pursuant to this Agreement and the representations and warranties of
the Company and the  Purchasers  contained in Article II shall  survive  until a
date that is three years after the last Closing Date.

         5.10  Execution.  This  Agreement  may  be  executed  in  two  or  more
counterparts,  all of which when taken  together shall be considered one and the
same agreement and shall become effective when  counterparts have been signed by
each party and  delivered  to the other  party,  it being  understood  that both
parties need not sign the same  counterpart.  In the event 



                                       23





that any signature is delivered by facsimile transmission,  such signature shall
create a valid and binding obligation of the party executing (or on whose behalf
such  signature is executed)  the same with the same force and effect as if such
facsimile signature page were an original thereof.

         5.11 Publicity.  The Company shall consult with each Purchaser and each
Purchaser  shall consult with the Company prior to issuing any press releases or
otherwise making public statements with respect to the transactions contemplated
hereby and the Company shall not issue any such press release or otherwise  make
any such public  statement  without the prior written  consent of each Purchaser
and the Purchasers  shall not issue any such press release or otherwise make any
public statement without the prior written consent of the Company, which consent
shall not be  unreasonably  withheld  or delayed,  except that no prior  consent
shall be required if such  disclosure is required by law, in which such case the
disclosing  parties  shall  provide the other  parties with prior notice of such
public statement.

         5.12  Severability.  In case any one or more of the  provisions of this
Agreement  shall be invalid or  unenforceable  in any respect,  the validity and
enforceability of the remaining terms and provisions of this Agreement shall not
in any way be affected or impaired thereby and the parties will attempt to agree
upon a valid and enforceable  provision  which shall be a reasonable  substitute
therefor,  and upon so agreeing,  shall incorporate such substitute provision in
this Agreement.

         5.13  Remedies.  In addition to being  entitled to exercise  all rights
provided herein or granted by law, including recovery of damages, the Purchasers
will be entitled to specific performance of the obligations of the Company under
the Transaction Documents. Each of the Company and the Purchasers (severally and
not jointly) agree that monetary damages would not be adequate  compensation for
any loss  incurred by reason of any breach of its  obligations  described in the
foregoing  sentence  and  hereby  agrees  to waive in any  action  for  specific
performance  of any such  obligation  the defense  that a remedy at law would be
adequate.


                   [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK
                             SIGNATURE PAGE FOLLOWS]



                                       24






         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed as of the date first indicated above.


                                     Company:

                                     PLC SYSTEMS INC.


                                     By:
                                          Name:
                                          Title:


                                     Purchasers:

                                     SOUTHBROOK INTERNATIONAL
                                       INVESTMENTS, LTD.


                                     By:
                                          Name:
                                          Title:


                                     HBK CAYMAN L.P.


                                     By:
                                          Name:
                                          Title:


                                     HBK OFFSHORE FUND LTD.


                                     By:
                                          Name:
                                          Title:



                                       25






                                                                 Schedule 2.1(a)


                                  SUBSIDIARIES
                                 --------------
<TABLE>
<CAPTION>
==================================================== ============================== ================================
                       Name                                  Jurisdiction                     Percentage
                                                                  of                           of Equity
                                                             Organization                  Securities Owned
                                                                                            by the Company
<S>                                                 <C>                            <C>
==================================================== ============================== ================================
PLC Medical Systems, Inc.                            Delaware                                    100%
==================================================== ============================== ================================
PLC Sistemas Medicos Internacionais, Lda             Portugal                                    100%
==================================================== ============================== ================================
PLC Sistemas Medicos GmbH                            Germany                                     100%
==================================================== ============================== ================================
PLC Medical Systems AG                               Switzerland                                 100%
==================================================== ============================== ================================
PLC Medical Systems Asia/Pacific Pte Ltd.            Singapore                                   100%
==================================================== ============================== ================================
PLC Medical Systems France                           France                                      100%
==================================================== ============================== ================================
</TABLE>





EXHIBIT 10b

                         FIRST AMENDMENT TO CONVERTIBLE
                          DEBENTURE PURCHASE AGREEMENT
                          ----------------------------


         THIS FIRST  AMENDMENT TO CONVERTIBLE  DEBENTURE  PURCHASE  AGREEMENT is
entered  into  this  22nd  day of  July,  1997 by and  among  PLC  Systems  Inc,
Southbrook International Investments, Ltd., HBK Cayman, L.P., HBK Offshore Fund,
Ltd., and Brown Simpson Strategic Growth Fund, LP.

         WHEREAS all of the parties,  [other than Brown Simpson Strategic Growth
Fund, LP , a New York limited partnership  (hereinafter "BSSGF")],  have entered
into the  Convertible  Debenture  Purchase  Agreement  dated July 17,  1997 (the
"Agreement")  whereby the Purchasers agreed to purchase,  and the Company agreed
to sell up to $20,000,000 of the Convertible Debentures; and

         WHEREAS BSSGF  desires to  participate  in the financing  upon the same
terms and  conditions  set forth in the  Agreement  whereby  BSSFG shall  invest
$75,000 in the Tranche 1 Closing and up to an additional  $75,000 in the Tranche
2 Closing; and

         WHEREAS,  all of the parties are willing to allow BSSGF to  participate
in accordance with the terms and conditions set forth herein;

         NOW THEREFORE, for good and valuable consideration, the sufficiency and
receipt whereof are hereby acknowledged, the parties hereby agree as follows:

         1.   Incorporation of Terms and Conditions.  Unless otherwise set forth
              herein, all defined terms herein have the meaning ascribed to them
              in  the  Agreement  and  for  purposes  of  this  Amendment,   all
              representations, warranties and covenants in the Agreement made by
              the Company are hereby deemed to be fully made to BSSGF as if made
              on the date  hereof.  All  other  terms of the  Agreement  and the
              Operative Documents not expressly modified herein are ratified and
              confirmed in all respects.  This Amendment,  the Agreement and the
              Operative  Documents as referenced therein constitute the complete
              and entire agreement among the parties.

         2.   Additional  Financing.  BSSGF hereby agrees to invest $75,000 upon
              the  same  terms  and  conditions,  including  pricing  terms,  as
              provided  in the  Tranche 1  Closing.  The  closing  shall take at
              Robinson  Silverman on or before July 24, 1997.  BSSGF also agrees
              to  invest up to an  additional  $75,000  upon the same  terms and
              conditions as provided for the Tranche 2 Closing.  All  references
              in the Agreement  and the other  Operative  Documents  referencing
              "$10,000,000"  in funding for either tranche are hereby amended to
              read  "$10,075,000"  and  all  references  in the  Agreement  to a
              "$20,000,000"  aggregate  financing  are  hereby  amended  to read
              "$20,150,000."  All  references in the  Debentures to a maximum of
              1,000,000 shares to be issued upon






              conversion   of  the   Debentures   is  hereby   amended  to  read
              "1,007,500."  Any and all  references  to  Warrants  for Tranche 1
              Financing  shall be  increased  from  warrants to purchase  65,000
              shares of Common  Stock to warrants to purchase  69,875  shares of
              Common  Stock with the warrant  for the  additional  4,875  shares
              issuable to BSSGF.

         3.   Representations  by BSSGF.  BSSGF hereby agrees to be bound by all
              of the terms and conditions set forth in the Agreement, subject to
              modification as set forth in this Amendment. BSSGF hereby warrants
              and  represents  that all of its limited  partners are  accredited
              investors  within  the  meaning of  Regulation  D of the 1933 Act.
              BSSGF hereby  warrants and represents  that its general partner is
              Brown  Simpson  Capital,  LLC  ("BSC"),  and that two of the three
              members of BSC are "accredited investors" as defined in Regulation
              D but  that one of the  members  is not an  "accredited  investor"
              within the meaning of Regulation D of the 1933 Act. However, BSSGF
              hereby  warrants  and  represents  to the Company  that it and its
              general  partner have such  knowledge and  experience in financial
              and  business  matters  that they are  capable of  evaluating  the
              merits and risks of the prospective  investment and that BSSGF and
              BSC have not been  organized  for the  purpose  of  acquiring  the
              Debentures  and  Warrants  and  shares  of Common  Stock  issuable
              thereunder.

         4.   Issuance of Debenture  and  Warrants;  Registration  Rights.  Upon
              receipt  of the  Tranche  1  funding  by  BSSGF in the  amount  of
              $75,000.00,  the  Company  shall  cause to be  issued to BSSGF the
              Debenture and Warrant in the forms attached hereto as Exhibits "A"
              and "B". Any and all securities  issuable to BSSGF hereunder shall
              be includable in any and enjoy all of the benefits and  privileges
              of  any  and  all  registration  statements  as set  forth  in the
              Registration Rights Agreement.

         5.   Notices.  Any notices  required under the Agreement  shall also be
              sent to BSSGF as follows:  Brown  Simpson  Strategic  Growth Fund,
              L.P., c/o Brown Simpson  Capital,  LLC.,  Carnegie Hall Tower, 152
              West  57th  Street,  New  York,  New  York  10019  (Facsimile  no.
              1-212-247-1329), Attention: Mr. Mitchell Kaye.

         6.   Exclusivity.  By executing this Agreement,  each of the Purchasers
              set forth in the Agreement hereby consent to the addition of BSSGF
              as a Purchaser in accordance with the provisions of Section 2.1(o)
              of the Agreement.


                      [THIS SPACE INTENTIONALLY LEFT BLANK]


                                       2


         IN WITNESS WHEREOF,  the parties have executed this Amendment as of the
date first written above.

                                           PLC SYSTEMS INC.


                                           By:_______________________
                                                 Name:
                                                 Title:

                                           SOUTHBROOK INTERNATIONAL
                                             INVESTMENTS, LTD.


                                           By:_______________________
                                                 Name:
                                                 Title:

                                           HBK CAYMAN L.P.


                                           By:_______________________
                                                 Name:
                                                 Title:

                                           HBK OFFSHORE FUND LTD.


                                           By:_______________________
                                                 Name:
                                                 Title:

                                           BROWN SIMPSON STRATEGIC
                                             GROWTH  FUND, LP
                                           By:  Brown Simpson Capital LLC, 
                                                  General Partner


                                           By:_______________________
                                                Matt Brown, Member,
                                                duly authorized



                                       3


Exhibit 10c

                         SECOND AMENDMENT TO CONVERTIBLE
                          DEBENTURE PURCHASE AGREEMENT
                          ----------------------------

                  THIS  SECOND  AMENDMENT  TO  CONVERTIBLE   DEBENTURE  PURCHASE
AGREEMENT  dated as of August [ ], 1997,  is made by and among PLC Systems  Inc.
(the "Company"),  Soutbrook International Investments, Ltd. ("Southbrook"),  HBK
Cayman L.P. ("HBK  Cayman"),  HBK Offshore Fund Ltd. ("HBK  Offshore") and Brown
Simpson Strategic Growth Fund, LP. ("Brown Simpson"). Southbrook, HBK Cayman and
HBK Offshore are each sometimes referred to herein as a "Initial  Purchaser" and
collectively as the "Initial  Purchasers"  and together with Brown Simpson,  the
"Purchasers".

                  WHEREAS, the Company and the Initial Purchasers are parties to
a certain Convertible  Debenture Purchase Agreement,  dated as of July 17, 1997,
as amended to include Brown  Simpson,  dated as of July 22, 1997 (the  "Purchase
Agreement"),  pursuant to which, among other things, the Company issued and sold
to the Purchasers 5% Convertible  Debentures,  due July 17, 2002 (the "Tranche 1
Debentures") and 5% Convertible Debentures, due July 22, 2002; and

                  WHEREAS,  capitalized terms not otherwise defined herein shall
have the definitions set forth in the Purchase Agreement.

                  WHEREAS,  the  parties  hereto  desire to amend and modify the
Purchase Agreement as set forth herein.

                  IN  CONSIDERATION  of the mutual  covenants and agreements set
forth  herein and for other good and  valuable  consideration,  the  receipt and
sufficiency  of which are  hereby  acknowledged,  the  parties  hereto  agree as
follows:

         1. The  Tranche 2 Closing.  The  Purchasers  hereby  agree to waive the
provisions  of Section  1.2(b) and the  conditions  of Sections  4.1 (b) (to the
extent specifically set forth herein),  (d), (f) (to the extent specifically set
forth herein),  and (i) of the Purchase  Agreement in order to allow the Company
to deliver a  Subsequent  Tranche  Notice,  on the date  hereof,  requiring  the
Purchasers to purchase Convertible Debentures in such aggregate principal amount
up to  $10,075,000  as the  Company may  designate  in such  Subsequent  Tranche
Notice.

         2. Representations and Warranties of the Company. Section 2.1(d) of the
Purchase Agreement is hereby amended and modified as follows:

         The Convertible  Debentures and the Warrants are duly authorized,  and,
         when issued and paid for in accordance with the terms hereof,  shall be
         validly issued,  fully paid and nonassessable.  The Company,  as at the
         Tranche 1 Closing Date and Tranche 2 Closing  Date,  as the case may be
         (each, a "Closing Date" and,  collectively,  the "Closing Dates"),  has
         and at all times while the Convertible







         Debentures and the Warrants are  outstanding  will maintain an adequate
         reserve  of duly  authorized  shares  of  Common  Stock to enable it to
         perform  its  conversion,  exercise  and other  obligations  under this
         Agreement,  the  Warrants  and the  Convertible  Debentures,  and in no
         circumstances  shall such reserved and available shares of Common Stock
         be less  than the sum of (i)  2,515,000  shares  of  Common  Stock  (or
         3,015,000  shares of Common  Stock as provided in Section 4 herein) for
         issuance  upon  conversion  of the Tranche 1  Debentures  and Tranche 2
         Debentures  and to enable the Company to pay  interest on the Tranche 1
         Debentures  and Tranche 2  Debentures  and (ii) the number of shares of
         Common  Stock  which  would be  issuable  upon  exercise in full of the
         Tranche  1  Warrants  and  Tranche  2  Warrants.  The  Company  and the
         Purchasers  agree that all  penalty  interest,  liquidated  damages and
         early   redemption  or  repayment   amounts  payable  pursuant  to  any
         Transaction  Documents shall be paid in cash unless otherwise consented
         to by  the  Purchasers.  The  shares  of  Common  Stock  issuable  upon
         conversion of Convertible  Debentures and upon exercise of the Warrants
         and payable as interest on the Debentures are collectively  referred to
         herein as the  "Underlying  Shares." When issued in accordance with the
         terms of the  Convertible  Debentures and the Warrants,  the Underlying
         Shares  will  be  duly  authorized,  validly  issued,  fully  paid  and
         nonassessable.  The  Convertible  Debentures,  Warrants and  Underlying
         Shares are collectively referred to herein as the "Securities."

         3. Listing and Reservation of Underlying Shares.  Section 3.8(a) of the
Purchase Agreement is hereby amended and modified as follows:

         The Company  shall (a) not later than the fifth  Business Day following
         the Tranche 2 Closing  Date  prepare and file with the  American  Stock
         Exchange (as well as any other national  securities  exchange or market
         on which the  Common  Stock is then  listed or  traded)  an  additional
         shares  listing  application  covering  at least  the sum of  2,665,000
         Underlying  Shares  (or  3,165,000  Underlying  Shares as  provided  in
         Section 4 herein)  (comprised of 2,515,000  shares (or 3,015,000 shares
         as provided in Section 4 herein)  reserved for issuance upon conversion
         of  Tranche 1  Debentures,  Tranche 2  Debentures  and the  payment  of
         interest thereon (but not penalty interest, for which the Company shall
         reserve  additional  shares),  subject to Section  2.1(d)  herein,  and
         150,000  shares  reserved  for  issuance  upon  exercise  of  Tranche 1
         Warrants and Tranche 2 Warrants); (b) take all steps necessary to cause
         such shares to be approved for listing in the American  Stock  Exchange
         (as well as on any  other  national  securities  exchange  or market on
         which the Common Stock is then listed) as soon as possible  thereafter;
         and (c) provide to the  Purchasers  evidence of such  listing,  and the
         Company  shall  maintain  the  listing  of its  Common  Stock  on  such
         exchange.  If the  Tranche 2 Warrants  are issued and  delivered  on or
         after the Tranche 2 Closing  Expiration  Date,  the Company  shall (not
         later than five  Business  Days  thereafter)  prepare and file with the
         American Stock Exchange (as well as any other national


                                       -2-





         securities  exchange or market on which the Common Stock is then listed
         or traded) an additional shares listing application covering the number
         of  Underlying  Shares  issuable upon exercise in full of the Tranche 2
         Warrants,  and take all  steps  necessary  to cause  such  shares to be
         approved for listing thereon as soon as possible thereafter.

         4. Registration of Underlying  Shares. The Company has agreed to file a
registration  statement covering  2,665,000  Underlying Shares (including shares
reserved for issuance upon  conversion  of the Tranche 1  Debentures,  Tranche 2
Debenture and the payment of interest thereon,  and shares reserved for issuance
on exercise of the Tranche 1 Warrants and the Tranche 2 Warrants)  following the
Tranche 2 Closing in accordance  with the  Registration  Rights  Agreement dated
July 17, 1997 among the parties hereto (the  "Registration  Rights  Agreement").
The  Company  agrees  that at any time after this date if either (i) the Company
receives a recommendation of non-approval of its Pre-Market  Application for its
Heart Laser System from the Circulatory  Systems Advisory Panel of the U.S. Food
and Drug  Administration  (the "Panel"),  or (ii) the Company does not receive a
recommendation  of approval of its  Pre-Market  Application  for its Heart Laser
System from the Panel or from the United States Food and Drug  Administration by
August 14,  1998,  then the maximum  number of shares of Common  Stock which the
Company shall be obligated to issue upon  conversion of the Tranche 1 Debentures
and Tranche 2 Debentures shall be increased from 2,515,000 to 3,015,000.  At the
request  of any  of  the  Purchasers  the  Company  shall  immediately  file  an
additional   registration   statement  in  accordance  with  the  terms  of  the
Registration  Rights Agreement with respect to an additional  500,000 Underlying
Shares.

         5. Additional Information. The Company hereby advises the Purchasers of
the  following  additional  developments  since  July 17,  1997  which have been
disclosed in press  releases and which will be stated in the Company's Form 10-Q
filing to be filed with the Securities and Exchange Commission by the end of the
business day on August 14, 1997:

                  (a) On July 28,  1997,  the Panel,  by a vote of 9 to 2, voted
against recommending Pre-Market Approval of the Heart Laser System at this time.
There  can be no  assurance  as to  when,  if  ever,  the  Company  will  obtain
Pre-Market  Approval from the Panel.  Although the Company's plans are to submit
additional  12-month  follow-up  patient  data from its Phase III studies to the
U.S.  Food and Drug  Administration  as soon as possible,  it is  impossible  to
ascertain at this time if the U.S.  Food and Drug  Administration  will consider
such data adequate to resubmit the  application  for Pre Market  Approval to the
Panel and to ultimately  grant PMA for the Heart Laser  System.  There can be no
assurance  that the Company's  Heart Laser System will receive PMA approval on a
timely basis, if at all.

                  (b) Subsequent to the July 28, 1997 Panel meeting, the Company
and certain of its officers have been named as  defendants  in eleven  purported
class action  lawsuits each filed in August 1997 in the United  States  District
Court for the District of Massachusetts.  The suits allege violations of federal
securities  laws.  The plaintiffs  are seeking  damages in connection  with such
alleged  violations.  Although  the  outcome  of these  suits  is not  currently
predictable,


                                       -3-





management  believes that the Company has meritorious  defenses,  and intends to
vigorously defend the suits.

         6.       Miscellaneous.

                  (a) The  headings  herein  are for  convenience  only,  do not
constitute a part of this  Agreement  and shall not be deemed to limit or affect
any of the provisions hereof.

                  (b) This  Agreement  shall be  governed by and  construed  and
enforced in  accordance  with the internal laws of the State of New York without
regard to the principles of conflicts of law thereof.

                  (c)  This   Agreement   may  be   executed   in  two  or  more
counterparts,  all of which when taken  together shall be considered one and the
same agreement and shall become effective when  counterparts have been signed by
each party and  delivered  to the other  party,  it being  understood  that both
parties need not sign the same  counterpart.  In the event that any signature is
delivered by facsimile  transmission,  such  signature  shall create a valid and
binding  obligation of the party executing (or on whose behalf such signature is
executed) the same with the same force and effect as if such facsimile signature
page were an original thereof.


                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK,
                             SIGNATURE PAGE FOLLOWS]



                                      -4-



                  IN WITNESS  WHEREOF,  the  parties  hereto  have  caused  this
Agreement to be duly executed as of the date first indicated above.

                                   PLC SYSTEMS INC.


                                   By:
                                       ---------------------------------
                                        Name:
                                        Title:


                                   SOUTHBROOK INTERNATIONAL
                                     INVESTMENTS, LTD.


                                   By:
                                       ---------------------------------
                                        Name:
                                        Title:


                                   HBK CAYMAN L.P.


                                   By:
                                       ---------------------------------
                                        Name:
                                        Title:


                                   HBK OFFSHORE FUND LTD.


                                   By:
                                       ---------------------------------
                                        Name:
                                        Title:

                                   BROWN SIMPSON STRATEGIC GROWTH
                                   FUND, LP
                                   By:  Brown Simpson Capital, LLC
                                        General Partner

                                   By:
                                       ---------------------------------
                                        Name:
                                        Title:



                                       -5-





Exhibit 10d


         NEITHER THIS DEBENTURE NOR THE SECURITIES  INTO WHICH THIS DEBENTURE IS
CONVERTIBLE HAVE BEEN REGISTERED WITH THE SECURITIES AND EXCHANGE  COMMISSION OR
THE  SECURITIES  COMMISSION  OF ANY STATE IN  RELIANCE  UPON AN  EXEMPTION  FROM
REGISTRATION  UNDER THE UNITED  STATES  SECURITIES  ACT OF 1933, AS AMENDED (THE
"SECURITIES ACT"), AND, ACCORDINGLY,  MAY NOT BE OFFERED OR SOLD EXCEPT PURSUANT
TO AN EFFECTIVE  REGISTRATION  STATEMENT UNDER THE SECURITIES ACT OR PURSUANT TO
AN  AVAILABLE   EXEMPTION  FROM,  OR  IN  A  TRANSACTION  NOT  SUBJECT  TO,  THE
REGISTRATION   REQUIREMENTS  OF  THE  SECURITIES  ACT  AND  IN  ACCORDANCE  WITH
APPLICABLE STATE SECURITIES LAWS.

         THIS  DEBENTURE  IS SUBJECT TO CERTAIN  RESTRICTIONS  ON  TRANSFER  AND
CONVERSION SET FORTH IN A CONVERTIBLE DEBENTURE PURCHASE AGREEMENT,  DATED AS OF
JULY 17,  1997,  AS AMENDED FROM TIME TO TIME,  EXECUTED BY THE ORIGINAL  HOLDER
HEREOF.  A COPY OF THAT  AGREEMENT  IS ON FILE AT THE  PRINCIPAL  OFFICE  OF PLC
SYSTEMS INC.

No. [   ]                                                           U.S. $[    ]


                                PLC SYSTEMS INC.
                     5% CONVERTIBLE DEBENTURE DUE [  ], 2002

         THIS DEBENTURE is one of a duly  authorized  issue of debentures of PLC
Systems Inc. a  corporation  organized  and  existing  under the laws of British
Columbia,  Canada,  having a  principal  place  of  business  at 10 Forge  Park,
Franklin, MA 02038 (the Company ), designated as its 5% Convertible  Debentures,
due [ ],  2002,  in an  aggregate  principal  amount of up to  $20,150,000  (the
"Debentures").

         FOR VALUE RECEIVED,  the Company  promises to pay to [ ], or registered
assigns (the Holder ), the principal sum of [ ] dollars ($[ ]), on or prior to [
], 2002 or such  earlier  date as the  Debentures  are  required to be repaid as
provided hereunder (the Maturity Date ) and to pay interest to the Holder on the
principal sum at the rate of 5% per annum,  payable upon  conversion as provided
hereunder,  or on the Maturity  Date if not earlier  converted.  Interest  shall
accrue daily  commencing  on the  Original  Issue Date (as defined in Section 6)
until payment in full of the principal sum, together with all accrued and unpaid
interest  and other  amounts  which may  become  due  hereunder,  has been made.
Interest  shall be  calculated on the basis of a 360-day year and for the actual
number of days elapsed.  Interest  hereunder will be paid to the person in whose
name this Debenture (or one or more predecessor Debentures) is registered on the
records of the Company  regarding  registration  and transfers of the Debentures
(the  Debenture  Register ) on the  Conversion  Date (as  defined  below) or the
Maturity  Date,  as the  case may be;  provided,  however,  that  the  Company's
obligation to a transferee of this Debenture arises 








only if such transfer,  sale or other disposition is made in accordance with the
terms and conditions hereof and of the Convertible Debenture Purchase Agreement,
dated  as of July  17,  1997,  as  amended  from  time to  time  (the  "Purchase
Agreement"),  executed by the original Holder.  All overdue,  accrued and unpaid
interest and other amounts due hereunder  shall bear interest at the rate of 15%
per annum from the day of  conversion  hereunder or the Maturity Date or earlier
date on which this  Debenture is  accelerated  through and including the date of
payment.  The  principal of, and interest on, and other amounts owing in respect
of this  Debenture  are payable in such coin or currency of the United States of
America  as at the time of payment  is legal  tender  for  payment of public and
private  debts,  at the address of the Holder last  appearing  on the  Debenture
Register,  except that  principal  paid on [ ], 2002 and interest due  hereunder
may, at the Company's  option, be paid in shares of the Common Stock (as defined
in Section 6)  calculated  based upon the average Per Share Market Value for the
five (5) Trading Days immediately  preceding the Conversion Date,  Maturity Date
or the date upon which interest shall cease to accrue, as provided below, as the
case may be. All amounts due hereunder  shall be paid in cash or in Common Stock
as provided herein.  Notwithstanding  anything to the contrary contained herein,
the Company may not issue  shares of the Common  Stock in payment of interest on
the  principal  amount if: (i) the number of shares of Common  Stock at the time
authorized, unissued and unreserved for all purposes, or held as treasury stock,
is insufficient to pay interest  hereunder in shares of Common Stock;  (ii) such
shares are not  registered  for resale  pursuant  to an  effective  registration
statement  that  names  the  recipient  of such  interest  shares  as a  selling
stockholder  thereunder and may not be sold without volume restrictions pursuant
to Rule 144  promulgated  under the  Securities  Act of 1933,  as  amended  (the
"Securities Act"), as determined by counsel to the Company pursuant to a written
opinion letter, addressed to the Holder, in form and substance acceptable to the
Holder;  (iii) such shares are not listed on the American Stock Exchange (or the
Nasdaq National  Market,  Nasdaq National Market or The New York Stock Exchange)
and any other exchange on which the Common Stock is then listed for trading;  or
(iv)  the  issuance  of  such  shares  would  result  in the  recipient  thereof
beneficially  owning  more than 4.999% of the issued and  outstanding  shares of
Common Stock as determined in  accordance  with Rule 13d-3 under the  Securities
Exchange  Act of 1934,  as amended.  Payment of interest  on the  Debentures  in
shares of Common Stock is also subject to the provisions of Section 4(a)(ii).  A
transfer of the right to receive  principal  and interest  under this  Debenture
shall be  transferable  only  through  an  appropriate  entry  in the  Debenture
Register as provided herein.  Notwithstanding anything to the contrary contained
herein,  interest hereunder will cease to accrue if the average Per Share Market
Value for any  consecutive 30 Trading Day period  commencing  after the Original
Issue Date exceeds the Per Share Market Value on the Original Issue Date by more
than 50%. In such event,  interest  accrued  through  such date shall be due and
payable.

         This Debenture is subject to the following additional provisions:

                  Section 1. The Debentures are issuable in denominations of Two
Hundred  Fifty  Thousand  Dollars  ($250,000)  and  integral  multiples of Fifty
Thousand  Dollars  ($50,000) in excess thereof.  The Debentures are exchangeable
for an equal  aggregate  amount of preferred  shares of the Company  which shall
have  identical  terms to the  terms  of this  


                                       2






Debenture,  at any time prior to Maturity  at the option of the Company  upon 30
Trading Days notice to the Holders,  provided,  that no such Notice may be given
by the Company at any time after  notice of a default  which if not timely cured
hereunder would constitute an Event of Default hereunder. No service charge will
be made for such registration of transfer or exchange.

                  Section 2. This  Debenture has been issued  subject to certain
investment  representations  of the  original  Holders set forth in the Purchase
Agreement  and may be  transferred  or  exchanged  only in  compliance  with the
Purchase Agreement. Prior to due presentment to the Company for transfer of this
Debenture,  the  Company  and any agent of the  Company  may treat the person in
whose name this  Debenture is duly  registered on the Debenture  Register as the
owner hereof for the purpose of receiving payment as herein provided and for all
other  purposes,  whether or not this  Debenture  is  overdue,  and  neither the
Company nor any such agent shall be affected by notice to the contrary.

                  Section 3.   Events of Default.

         "Event  of  Default",  wherever  used  herein,  means  any  one  of the
following  events  (whatever  the reason and  whether it shall be  voluntary  or
involuntary or effected by operation of law or pursuant to any judgment,  decree
or order of any court, or any order,  rule or regulation of any Federal,  state,
local or foreign administrative or governmental body):

                  (a) any default in the payment of the principal  of,  interest
         on or  liquidated  damages in respect of, this  Debenture,  free of any
         claim of  subordination,  as and when the  same  shall  become  due and
         payable on the Conversion  Date or the Maturity Date or by acceleration
         or otherwise;

                  (b) the Company  shall fail to observe or perform any warranty
         contained in, or any  representation of the Company shall prove to have
         been incorrect  when given under,  or the Company shall fail to observe
         or perform in any material  respect any covenant or agreement under, or
         otherwise commit any breach of, this Debenture, the Purchase Agreement,
         any Warrant (as defined in the Purchase  Agreement) or the Registration
         Rights  Agreement (as defined in Section 6), and such failure or breach
         shall not have  been  remedied  within 10 days  after the date on which
         notice of such failure or breach shall have been given;

                  (c) the Company or any of its subsidiaries shall commence,  or
         there shall be commenced  against the Company or any such  subsidiary a
         case  under any  applicable  bankruptcy  or  insolvency  laws as now or
         hereafter in effect or any successor thereto,  or the Company commences
         any other proceeding under any reorganization,  arrangement, adjustment
         of debt, relief of debtors,  dissolution,  insolvency or liquidation or
         similar  law of any  jurisdiction  whether now or  hereafter  in effect
         relating to the Company or any subsidiary thereof or there is commenced
         against the  Company or any  subsidiary  thereof  any such  bankruptcy,
         insolvency or other proceeding  which remains  undismissed for a period
         of 60 days;  or the Company or any  subsidiary  thereof is  

 
                                        3






         adjudicated  insolvent  or  bankrupt;  or any  order of relief or other
         order approving any such case or proceeding is entered;  or the Company
         or any subsidiary  thereof  suffers any appointment of any custodian or
         the like for it or any substantial part of its property which continues
         undischarged or unstayed for a period of 60 days; or the Company or any
         subsidiary  thereof  makes a  general  assignment  for the  benefit  of
         creditors;  or the Company shall fail to pay, or shall state that it is
         unable to pay, or shall be unable to pay,  its debts  generally as they
         become  due;  or the  Company or any  subsidiary  thereof  shall call a
         meeting of its  creditors  with a view to  arranging a  composition  or
         adjustment of its debts; or the Company or any subsidiary thereof shall
         by any act or failure to act  indicate  its consent to,  approval of or
         acquiescence in any of the foregoing;  or any corporate or other action
         is taken by the  Company or any  subsidiary  thereof for the purpose of
         effecting any of the foregoing;

                  (d) the Company shall default in any of its obligations  under
         any mortgage,  credit agreement or other facility,  indenture agreement
         or other  instrument  under which there is  indebtedness of the Company
         exceeding one hundred thousand dollars  ($100,000) secured by assets of
         the Company (or any Subsidiary thereon),  whether such indebtedness now
         exists or shall  hereafter be created and such default  shall result in
         such  indebtedness  becoming or being declared due and payable prior to
         the date on which it would otherwise become due and payable;

                  (e) the Common Stock shall be delisted from the American Stock
         Exchange or any other national  securities  exchange or market on which
         such  Common  Stock is listed for  trading or  suspended  from  trading
         thereon without being relisted or having such suspension lifted, as the
         case may be, within three Trading Days; or

                  (f)  the   Company   shall  be  a  party  to  any   merger  or
         consolidation  pursuant to which the Company shall not be the surviving
         entity or shall  dispose of all or  substantially  all of its assets in
         one or more transactions, or shall redeem more than a de minimis number
         of shares of Common Stock (other than an  aggregate  of  $1,000,000  of
         shares of Common Stock which may be  repurchased  from  employees  upon
         their  termination  of  employment  with  the  Company,  calculated  by
         reference  to the market  price of the Common  Stock at such time,  and
         other than redemptions of Underlying Shares (as defined in Section 6)).

If during the time that any portion of this Debenture remains  outstanding,  any
Event of Default  occurs  and is  continuing,  and in every such case,  then the
Holders may, by notice to the Company, declare the full principal amount of this
Debenture, together with all accrued but unpaid interest and other amounts owing
hereunder, to the date of acceleration,  to be, plus the "Adjustment Amount" (as
defined in Section 6)  whereupon  the same  shall  become,  immediately  due and
payable in cash  (notwithstanding  anything  herein  contained to the  contrary)
without presentment,  demand,  protest or other notice of any kind, all of which
are waived by the  Company,  notwithstanding  anything  herein  contained to the
contrary,  and the Holder may  immediately  and without  expiration of any grace
period  enforce any and all of its rights and remedies  hereunder  and all other
remedies available to it under applicable law. 


                                       4






Such  declaration  may be rescinded  and annulled by Holder at any time prior to
payment  hereunder.  No such rescission or annulment shall affect any subsequent
Event of Default or impair any right consequent thereon.

                  Section 4.   Conversion.

                  (a) (i) This Debenture shall be convertible into shares of the
Common  Stock  (subject  to  reduction  pursuant to Section  4(a)(ii)  below and
Section 3.7 of the Purchase  Agreement,  at the option of the Holder in whole or
in part at any time and from time to time  after  the  Original  Issue  Date and
prior to the close of business on the  Maturity  Date.  The Holder  shall effect
conversions by  surrendering  the  Debentures  (or such portions  thereof) to be
converted,  together  with the form of  conversion  notice  attached  hereto  as
Exhibit A (the "Conversion Notice") to the Company. Each Conversion Notice shall
specify the principal  amount of  Debentures  to be converted  (which may not be
less than $100,000 or such less principal amount of Debentures than held by such
Holder) and the date on which such conversion is to be effected,  which date may
not be prior to the date such Conversion Notice is deemed to have been delivered
pursuant to Section  4(h) (the  "Conversion  Date").  If no  Conversion  Date is
specified in a Conversion Notice, the Conversion Date shall be the date that the
Conversion  Notice is deemed  delivered  pursuant  to Section  4(h).  Subject to
Sections  4(a)(ii)  and 4(b) hereof and Section 3.7 of the  Purchase  Agreement,
each  Conversion  Notice,  once given,  shall be  irrevocable.  If the Holder is
converting less than all of the principal amount represented by the Debenture(s)
tendered by the Holder with the Conversion Notice, or if a conversion  hereunder
cannot  be  effected  in full for any  reason,  the  Company  shall  honor  such
conversion to the extent  permissible  hereunder and shall  promptly  deliver to
such Holder (in the manner and within the time set forth in Section  5(b)) a new
Debenture for such principal amount as has not been converted.

                      (ii) Certain  Regulatory  Approval.  If on the  Conversion
Date  applicable  to any  conversion,  (A) the Common  Stock is then  listed for
trading on the American Stock Exchange or Nasdaq National Market or if the rules
of the  Nasdaq  Stock  Market  are  hereafter  amended  to extend  Rule  4460(i)
promulgated  thereby (or any successor or replacement  provision thereof) to the
Nasdaq  SmallCap  Market and the Common Stock is then listed for trading on such
market or  exchange,  (B) the  Conversion  Price then in effect is such that the
aggregate  number of shares of the Common Stock that would then be issuable upon
conversion of the entire  outstanding  principal amount of Debentures,  together
with any  shares of the  Common  Stock  previously  issued  upon  conversion  of
Debentures and in respect of payment of interest hereunder would equal or exceed
20% of the  number of shares of the Common  Stock  outstanding  on the  Original
Issue Date (the  "Issuable  Maximum"),  and (C) the Company  has not  previously
obtained the  Stockholder  Approval (as defined  below),  then the Company shall
issue to the Holder  requesting such  conversion the Issuable  Maximum and, with
respect  to any  shares of the  Common  Stock  that  otherwise  would  have been
issuable  to such  holder in  respect  of the  Conversion  Notice at issue or in
respect of payment of interest hereunder in excess of the Issuable Maximum,  the
Holder shall have the option to require the Company to either (1) as promptly as
possible, but in no event later than 90 days after such Conversion Date, convene
a meeting of the holders of the Common Stock and use its  


                                       5







reasonable efforts to obtain the Stockholder  Approval or (2) prepay, from funds
legally  available  therefor at the time of such prepayment,  the balance of the
principal  amount of the Debentures  subject to such  Conversion  Notice and the
remaining  aggregate principal amount of Debentures then outstanding and held by
such  Holder  at a  price  equal  to the  sum of (A)  the  principal  amount  of
Debentures then outstanding and held by such Holder multiplied by the product of
(i) the average Per Share Market Value for the five (5) Trading Days immediately
preceding  (1) the  Conversion  Date or (2) the date of  payment  in full by the
Company of such  prepayment  price,  whichever  is greater,  divided by (ii) the
Conversion  Price  calculated  on the  Conversion  Date plus (B) all accrued and
unpaid  interest  and other  amounts  then due in  respect  of such  Debentures;
provided,  however,  that if the Holder has  requested  that the Company  obtain
Stockholder  Approval  under  paragraph  (1) above and the Company fails for any
reason to obtain such  Stockholder  Approval within the time period set forth in
(1) above,  the Company  shall be obligated to prepay  Debentures  in accordance
with the  provisions  of  paragraph  (2)  above,  and in such case the  interest
contemplated  by the immediately  succeeding  sentence shall be deemed to accrue
from the  Conversion  Date. If the Holder has requested  that the Company prepay
Debentures  pursuant to this Section and the Company fails for any reason to pay
the  prepayment  price under (2) above  within  seven days after the  Conversion
Date,  the Company will pay interest on such  prepayment  price at a rate of 15%
per annum to the converting Holder,  accruing from the Conversion Date until the
prepayment  price plus any accrued  interest thereon is paid in full. The entire
prepayment  price,   including   interest  thereon,   shall  be  paid  in  cash.
"Stockholder  Approval" means the approval by a majority of the total votes cast
on the proposal,  in person or by proxy, at a meeting of the stockholders of the
Company held in accordance with the Company's  Certificate of Incorporation  and
by-laws,  of the issuance by the Company of shares of the Common Stock exceeding
the Issuable  Maximum as a consequence of the conversion of Debentures  into the
Common Stock at a price less than the greater of the book or market value on the
Original  Issue Date as and to the extent  required  pursuant to Rule 713 of the
American  Stock  Exchange  or Rule  4460(i) of the Nasdaq  Stock  Market (or any
successor or replacement provision thereof), as applicable.

                      (iii) Maximum Conversion Shares.  Notwithstanding anything
to the contrary set forth herein, the Company shall not be obligated to issue in
excess of 2,500,000 shares of Common Stock upon conversion of Debentures,  which
shares shall  constitute  payment in full of all accrued interest and payment of
principal due on the expiration date of such  Debentures,  which number shall be
subject  to  adjustment  pursuant  to  Section 4 (but not in the event  that the
Debentures  are  accelerated  in  accordance   herewith).   Notwithstanding  the
foregoing,  should  the  Company  receive  either  (i) a  recommendation  of new
approval  of its  Pre-Market  Application  for its Heart  Laser  System from the
Circulatory  Systems  Advisory  Panel (the  "Panel")  of the U.S.  Food and Drug
Administration   (the  "FDA"),   or  (ii)  should  the  Company  not  receive  a
recommendation of approval of its Pre-Market  Application for Heart Laser System
from the Panel or the FDA by August 14, 1998,  then the maximum number of shares
of Common Stock which the Company shall be obligated to issue upon conversion of
the Debentures  shall be increased  from  2,500,000 to 3,000,000.  In accordance
with the  Purchase  Agreement  such number of shares shall be available on a pro
rata basis based upon the pro rata purchase price for the Debentures paid by the
Original  Holders of  Debentures.  Shares of Common  Stock  issued in respect of
penalties and liquidated


                                       6






damages  hereunder  shall not count towards the share limits  referenced in this
paragraph and shall be paid in cash unless otherwise agreed to by the Holders.

                  (b) Not later than  three  Trading  Days after the  Conversion
Date, the Company will deliver to the Holder (i) a certificate  or  certificates
which shall be free of restrictive legends and trading  restrictions (other than
those required by Section 3.1 of the Purchase Agreement) representing the number
of shares of the Common Stock being  acquired upon the  conversion of Debentures
(subject to reduction pursuant to Section 4(a)(ii) hereof and Section 3.7 of the
Purchase  Agreement),  (ii)  Debentures  in a  principal  amount  equal  to  the
principal  amount of Debentures not converted;  (iii) a bank check in the amount
of all  accrued and unpaid  interest  (if the Company has elected to pay accrued
interest  in cash),  together  with all other  amounts  then due and  payable in
accordance  with the  terms  hereof,  in  respect  of  Debentures  tendered  for
conversion and (iv) if the Company has elected to pay accrued interest in shares
of the Common Stock,  certificates,  which shall be free of restrictive  legends
and trading  restrictions (other than those required by the Purchase Agreement),
representing  such number of shares of the Common Stock as equals such  interest
divided  by the  average  Per  Share  Market  Value  for the five  Trading  Days
immediately  preceding the Conversion Date; provided,  however, that the Company
shall not be obligated to issue certificates evidencing the shares of the Common
Stock  issuable  upon  conversion of the  principal  amount of Debentures  until
Debentures  are either  delivered for  conversion to the Company or any transfer
agent for the Debentures or the Common Stock, or the Holder notifies the Company
that such  Debenture has been lost,  stolen or destroyed and provides a bond (or
other adequate security) reasonably satisfactory to the Company to indemnify the
Company from any loss incurred by it in connection  therewith (in which case the
Company  shall issue a  replacement  Debenture in like  principal  amount).  The
Company shall,  upon request of the Holder,  use its best efforts to deliver any
certificate or  certificates  required to be delivered by the Company under this
Section  electronically  through the  Depository  Trust  Corporation  or another
established clearing corporation performing similar functions. If in the case of
any Conversion  Notice such certificate or certificates,  including for purposes
hereof,  any shares of the Common Stock to be issued on the  Conversion  Date on
account of accrued but unpaid  interest  hereunder,  are not  delivered to or as
directed by the applicable  Holder by the third Trading Day after the Conversion
Date,  the Holder shall be entitled by written notice to the Company at any time
on or before its receipt of such  certificate  or  certificates  thereafter,  to
rescind such conversion, in which event the Company shall immediately return the
Debentures  tendered  for  conversion.  If the  Company  fails to deliver to the
Holder such certificate or certificates pursuant to this Section,  including for
purposes  hereof,  any shares of the Common Stock to be issued on the Conversion
Date on account of accrued  but unpaid  interest  hereunder,  prior to the fifth
Trading Day after the Conversion Date, the Company shall pay to such Holder,  in
cash, as liquidated damages and not as a penalty, $1,500 for each day after such
fifth Trading Day until such certificates are delivered. If the Company fails to
deliver to the Holder such certificate or certificates  pursuant to this Section
prior to the 15th day after the  Conversion  Date,  the  Company  shall,  at the
Holder's option (i) prepay, from funds legally available therefor at the time of
such  prepayment,  the aggregate of the principal amount of Debentures then held
by such Holder, as requested by such Holder, and (ii) pay all accrued but unpaid
interest on account of the Debentures for which the Company shall have failed to
issue the Common 

                                       7






Stock  certificates  hereunder,  in cash. The prepayment price shall be equal to
the sum of (A) the  aggregate  of all  accrued  but  unpaid  interest  and other
non-principal  amounts then payable in respect of all  Debentures  to be prepaid
hereunder and for which prepayment hereunder is demanded, plus (B) the aggregate
of the principal amount of Debentures then held by such Holder multiplied by (1)
the average Per Share  Market  Value for the five (5) Trading  Days  immediately
preceding  (x) the  Conversion  Date or (y) the date of  payment  in full by the
Company of such  prepayment  price,  whichever  is greater,  divided by, (2) the
Conversion  Price calculated on the Conversion Date. If the Holder has requested
that the Company  prepay  Debentures  pursuant  to this  Section and the Company
fails for any reason to pay the  prepayment  price  within seven days after such
notice is deemed  delivered  pursuant  to Section  4(h),  the  Company  will pay
interest  on the  prepayment  price at a rate of 15% per annum,  in cash to such
Holder,  accruing  from such  seventh  day until  the  prepayment  price and any
accrued interest thereon is paid in full.

                  (c) (i) The  conversion  price  (the  "Conversion  Price")  in
effect on any Conversion Date shall be the lesser of (a) 120% of the average Per
Share Market Value of the Common Stock for the ten (10) Trading Days immediately
preceding the Original Issue Date (the "Initial  Conversion  Price") and (b) the
average  of the five (5)  consecutive  lowest  Per Share  Market  Values for the
thirty (30) Trading Days  immediately  preceding the Conversion Date (which such
thirty  (30)  Trading  Day  period  must  commence  on or the issue date of this
Debenture);  provided that, (a) if the  registration  statement  registering the
resale of the shares of Common Stock issuable upon  conversion of the Debentures
and  payment  of  interest  thereunder  and  naming  the  Holder  as  a  Selling
Stockholder  thereunder (the "Underlying Shares Registration  Statement") is not
filed on or prior to the 30th day  after the  Original  Issue  Date,  or (b) the
Company  fails  to  file  with  the  Securities  and  Exchange  Commission  (the
"Commission")  a  request  for  acceleration  in  accordance  with  Rule  12d1-2
promulgated under the Securities  Exchange Act of 1934, as amended,  within five
(5) days of the  date  that the  Company  is  notified  (orally  or in  writing,
whichever is earlier) by the Commission that an Underlying  Shares  Registration
Statement  will not be "reviewed" or is not subject to further review or comment
by the Commission, or (c) if the Underlying Shares Registration Statement is not
declared  effective  by the  Commission  on or prior to the 90th day  after  the
Original Issue Date, or (d) if such Underlying Shares Registration  Statement is
filed with and declared  effective by the Commission but thereafter ceases to be
effective  as to all  Registrable  Securities  (as such term is  defined  in the
Registration  Rights  Agreement)  at any  time  prior to the  expiration  of the
"Effectiveness  Period"  (as such term as  defined  in the  Registration  Rights
Agreement),   without  being  succeeded  by  a  subsequent   Underlying   Shares
Registration  Statement  filed with and  declared  effective  by the  Commission
within 10  Business  Days (as  defined in  Section  6), or (e) if trading in the
Common Stock shall be suspended for any reason for more than three Trading Days,
or (f) if the  conversion  rights of the  Holders of  Debentures  hereunder  are
suspended for any reason (any such failure being  referred to as an "Event," and
for purposes of clauses (a), (c) and (f) the date on which such Event occurs, or
for  purposes  of  clause  (b) the date on which  such  five (5) days  period is
exceeded,  or for  purposes  of  clause  (d) the  date  which  such 10  Business
Day-period  is  exceeded,  or for  purposes of clause (e) the date on which such
three Trading Day period is exceeded,  being referred to as "Event  Date"),  the
Conversion  Price shall be  decreased by 2.5% on the Event Date and each monthly


                                        8








anniversary  thereof until the earlier to occur of the second month  anniversary
after the Event Date and such time as the applicable  Event is cured (i.e.,  the
Conversion  Price  would  decrease by 2.5% as of the Event Date and 5% as of the
one  month  anniversary  of  such  Event  Date).  Commencing  the  second  month
anniversary  after  the  Event  Date,  at the  option  of each  Holder  for each
applicable  monthly  period either (a) the Company shall pay to the Holders 2.5%
of the product of the principal  amount of outstanding  Debentures  (each Holder
being  entitled  to receive  such  portion of such amount as equals its pro rata
portion of Debentures  then  outstanding),  in cash or (b) the Conversion  Price
shall be  decreased by 2.5% for each  additional  such month (to be effective in
full on the monthly applicable Event Date) as liquidated  damages,  and not as a
penalty on the first day of each monthly anniversary of the Event Date in either
case until  such time as the  applicable  Event is cured.  Any  decrease  in the
Conversion Price pursuant to this Section shall remain in effect notwithstanding
the fact that the Event  causing such decrease has been  subsequently  cured and
further  monthly  decreases have ceased.  The provisions of this Section are not
exclusive  and  shall  in no way  limit  the  Company's  obligations  under  the
Registration Rights Agreement.

                      (iii) If the Company, at any time while any Debentures are
outstanding,  (a) shall pay a stock dividend or otherwise make a distribution or
distributions  on  shares  of its  Common  Stock or any  other  equity or equity
equivalent  securities  payable in shares of the  Common  Stock,  (b)  subdivide
outstanding  shares of the  Common  Stock into a larger  number of  shares,  (c)
combine  outstanding shares of the Common Stock into a smaller number of shares,
or (d) issue by  reclassification  of shares of the  Common  Stock any shares of
capital stock of the Company,  the Initial  Conversion Price shall be multiplied
by a fraction of which the numerator shall be the number of shares of the Common
Stock (excluding  treasury shares, if any) outstanding  before such event and of
which  the  denominator  shall be the  number  of  shares  of the  Common  Stock
outstanding  after such event.  Any  adjustment  made  pursuant to this  Section
4(c)(ii)  shall  become  effective  immediately  after the  record  date for the
determination of stockholders  entitled to receive such dividend or distribution
and shall become effective immediately after the effective date in the case of a
subdivision, combination or re-classification.

                      (iv) If the Company,  at any time while any Debentures are
outstanding,  shall issue  rights or warrants to all holders of the Common Stock
(and not to Holders of  Debentures)  entitling them to subscribe for or purchase
shares of the Common  Stock at a price per share less than the Per Share  Market
Value of the Common  Stock at the  record  date  mentioned  below,  the  Initial
Conversion  Price shall be  multiplied by a fraction,  of which the  denominator
shall be the number of shares of the Common Stock (excluding treasury shares, if
any)  outstanding  on the date of issuance  of such rights or warrants  plus the
number of  additional  shares of the Common Stock  offered for  subscription  or
purchase, and of which the numerator shall be the number of shares of the Common
Stock (excluding treasury shares, if any) outstanding on the date of issuance of
such rights or warrants plus the number of shares which the  aggregate  offering
price of the total number of shares so offered would  purchase at such Per Share
Market Value. Such adjustment shall be made whenever such rights or warrants are
issued,  and shall become  effective  immediately  after the record date for the
determination  of  stockholders  entitled to receive  such  rights or  warrants.
However,  upon the 


                                       9







expiration  of any right or warrant to purchase  shares of the Common  Stock the
issuance of which  resulted in an  adjustment  in the Initial  Conversion  Price
pursuant to this Section  4(c)(iii),  if any such right or warrant  shall expire
and  shall  not  have  been  exercised,   the  Initial  Conversion  Price  shall
immediately  upon such expiration be recomputed and effective  immediately  upon
such  expiration  be  increased  to the  price  which it would  have  been  (but
reflecting any other  adjustments in the Initial  Conversion Price made pursuant
to the  provisions  of this  Section  4 after  the  issuance  of such  rights or
warrants)  had the  adjustment  of the  Initial  Conversion  Price made upon the
issuance  of such  rights or  warrants  been made on the basis of  offering  for
subscription or purchase only that number of shares of the Common Stock actually
purchased upon the exercise of such rights or warrants actually exercised.

                      (v) If the  Company,  at any  time  while  Debentures  are
outstanding,  shall  distribute  to all holders of the Common  Stock (and not to
Holders of  Debentures)  evidences  of its  indebtedness  or assets or rights or
warrants to subscribe for or purchase any security  (excluding those referred to
in  Sections  4(c)(ii)  and (iii)  above),  then in each  such case the  Initial
Conversion Price at which  Debentures  shall thereafter be convertible  shall be
determined by multiplying  the Initial  Conversion  Price in effect  immediately
prior to the record date fixed for  determination  of  stockholders  entitled to
receive such  distribution by a fraction of which the  denominator  shall be the
Per Share  Market  Value of the Common  Stock  determined  as of the record date
mentioned above, and of which the numerator shall be such Per Share Market Value
of the Common  Stock on such record date less the then fair market value at such
record  date of the  portion  of such  assets or  evidence  of  indebtedness  so
distributed  applicable  to  one  outstanding  share  of  the  Common  Stock  as
determined by the Board of Directors in good faith;  provided,  however, that in
the event of a distribution exceeding ten percent (10%) of the net assets of the
Company,  such fair market value shall be determined by a nationally  recognized
or major  regional  investment  banking  firm or firm of  independent  certified
public accountants of recognized  standing (which may be the firm that regularly
examines the financial  statements of the Company) (an "Appraiser")  selected in
good  faith  by the  holders  of a  majority  in  interest  of  Debentures  then
outstanding;  and  provided,  further,  that the Company,  after  receipt of the
determination  by such  Appraiser  shall have the right to select an  additional
Appraiser,  in good faith, in which case the fair market value shall be equal to
the average of the  determinations  by each such  Appraiser.  In either case the
adjustments  shall be  described  in a  statement  provided  to the  holders  of
Debentures of the portion of assets or evidences of  indebtedness so distributed
or such  subscription  rights  applicable to one share of the Common Stock. Such
adjustment shall be made whenever any such distribution is made and shall become
effective immediately after the record date mentioned above.

                      (vi) All  calculations  under this Section 4 shall be made
to the nearest cent or the nearest 1/100th of a share, as the case may be.

                      (vii)  Whenever the Initial  Conversion  Price is adjusted
pursuant to Section  4(c)(ii),(iii)  or (iv), the Company shall promptly mail to
each Holder of  Debentures in  accordance  with Section  5(h), a notice  setting
forth the Initial  Conversion  Price after such  adjustment  and setting forth a
brief statement of the facts requiring such adjustment.


                                       10







                      (viii) In case of any reclassification of the Common Stock
or any compulsory share exchange pursuant to which the Common Stock is converted
into other securities, cash or property, the Holder of this Debenture shall have
the right  thereafter  to,  at its  option,  (A)  convert  the then  outstanding
principal  amount,  together with all accrued but unpaid  interest and any other
amounts then owing  hereunder in respect of this  Debenture only into the shares
of stock and other securities, cash and property receivable upon or deemed to be
held by holders of the Common Stock  following  such  reclassification  or share
exchange, and the Holders of the Debentures shall be entitled upon such event to
receive such amount of securities,  cash or property as the shares of the Common
Stock of the Company into which the then outstanding principal amount,  together
with all accrued but unpaid  interest and any other amounts then owing hereunder
in respect of this Debenture could have been converted immediately prior to such
reclassification  or share  exchange would have been entitled or (B) require the
Company to prepay,  from funds  legally  available  therefor at the time of such
prepayment,  all of its  Debentures  at a  price  equal  to the  sum of (i)  the
aggregate  of the  principal  amount  of  Debentures  then  held  by the  Holder
multiplied  by (a) the average Per Share  Market  Value for the five (5) Trading
Days  immediately  preceding (1) the effective date of the  reclassification  or
share exchange  triggering such  prepayment  right or (2) the date of payment in
full by the Company of the  prepayment  price  hereunder,  whichever is greater,
divided by (b) the Conversion Price calculated on such effective date, plus (ii)
the aggregate of all accrued but unpaid  interest and other amounts then payable
in respect of all Debentures to be repaid hereunder. The entire redemption price
shall be paid in cash, and the terms of payment of such  redemption  price shall
be subject to the  provisions  set forth in Section 5(b).  The terms of any such
reclassification or share exchange shall include such terms so as to continue to
give to the Holder the right to receive the  securities,  cash or  property  set
forth in this Section  4(c)(vii) upon any conversion  following such event. This
provision  shall  similarly  apply  to  successive  reclassifications  or  share
exchanges.

                           (ix)     If:

                                    A.     the Company  shall declare a dividend
                                           (or any  other  distribution)  on its
                                           Common Stock; or

                                    B.     the Company  shall  declare a special
                                           nonrecurring  cash  dividend  on or a
                                           redemption (other than redemptions of
                                           the  stock of  employees  upon  their
                                           termination  of  employment  with the
                                           Company in an aggregate amount not to
                                           exceed   $1,000,000,   calculated  by
                                           reference  to the market price of the
                                           Common  Stock  at such  time)  of its
                                           Common Stock; or

                                    C.     the  Company   shall   authorize  the
                                           granting to all holders of the Common
                                           Stock rights or warrants to subscribe
                                           for or purchase any shares of capital
                                           stock of any class or of any  rights;
                                           or


                                       11








                                    D.     the approval of any  stockholders  of
                                           the  Company  shall  be  required  in
                                           connection with any  reclassification
                                           of the Common  Stock of the  Company,
                                           any  consolidation or merger to which
                                           the  Company is a party,  any sale or
                                           transfer of all or substantially  all
                                           of the assets of the Company,  of any
                                           compulsory  share of exchange whereby
                                           the Common  Stock is  converted  into
                                           other  securities,  cash or property;
                                           or

                                    E.     the  Company   shall   authorize  the
                                           voluntary or involuntary dissolution,
                                           liquidation  or  winding  up  of  the
                                           affairs of the Company;

then the Company shall cause to be filed at each office or agency maintained for
the purpose of conversion of the Debentures, and shall cause to be mailed to the
Holders of  Debentures  at their last  addresses  as they shall  appear upon the
stock books of the Company,  at least 30 calendar  days prior to the  applicable
record or effective date hereinafter specified, a notice stating (x) the date on
which a record is to be taken for the  purpose of such  dividend,  distribution,
redemption,  rights or warrants,  or if a record is not to be taken, the date as
of which the  holders  of the  Common  Stock of record  to be  entitled  to such
dividend, distributions,  redemption, rights or warrants are to be determined or
(y) the  date on  which  such  reclassification,  consolidation,  merger,  sale,
transfer or share  exchange is expected to become  effective  or close,  and the
date as of which it is expected that holders of the Common Stock of record shall
be entitled to exchange their shares of the Common Stock for securities, cash or
other property deliverable upon such  reclassification,  consolidation,  merger,
sale, transfer or share exchange;  provided,  however,  that the failure to mail
such notice or any defect therein or in the mailing thereof shall not affect the
validity of the  corporate  action  required  to be  specified  in such  notice.
Holders are entitled to convert  Debentures  during the 30-day period commencing
the date of such  notice  to the  effective  date of the event  triggering  such
notice.

                  (d) If at any time conditions  shall arise by reason of action
taken by the  Company  which in the  opinion of the Board of  Directors  are not
adequately covered by the other provisions hereof and which might materially and
adversely affect the rights of the Holders (different than or distinguished from
the effect generally on rights of holders of any class of the Company's  capital
stock) or if at any time any such  conditions are expected to arise by reason of
any action contemplated by the Company,  the Company shall mail a written notice
briefly  describing the action  contemplated and the material adverse effects of
such action on the rights of the Holders at least 30 calendar  days prior to the
effective  date of such action,  and an  Appraiser  mutually  acceptable  to the
Holders of majority in interest of the Debentures and the Company shall give its
opinion  as to the  adjustment,  if any (not  inconsistent  with  the  standards
established  in  this  Section  4),  of  the  Conversion  Price  (including,  if
necessary,  any  adjustment  as to the  securities  into  which  Debentures  may
thereafter be convertible) and any distribution which is or would be required to
preserve  without diluting the rights of the Holders.  The  determination of the
Appraiser shall be final.


                                       12







                  (e) The Company  covenants  that it will at all times  reserve
and keep available out of its authorized and unissued shares of the Common Stock
solely for the purpose of issuance upon conversion of the Debentures and payment
of interest on the  Debentures,  each as herein  provided,  free from preemptive
rights or any other actual contingent  purchase rights of persons other than the
Holders, the sum of 3,000,000 shares of Common Stock for issuance (on a pro rata
basis as described in Section  4(a)(iii) upon  conversion of Debentures  (taking
into account the  adjustments  and  restrictions of Section 4(c)) and payment of
interest hereunder in Common Stock. The Company covenants that all shares of the
Common Stock that shall be so issuable  shall,  upon issue,  be duly and validly
authorized,  issued and fully paid,  nonassessable and, if the Underlying Shares
Registration  Statement has been declared  effective  under the Securities  Act,
freely tradeable.

                  (f) Upon a  conversion  hereunder  the  Company  shall  not be
required to issue stock  certificates  representing  fractions  of shares of the
Common Stock, but may if otherwise permitted,  make a cash payment in respect of
any final  fraction of a share based on the Per Share Market Value at such time.
If the Company elects not, or is unable, to make such a cash payment, the holder
shall be  entitled  to receive,  in lieu of the final  fraction of a share,  one
whole share of Common Stock.

                  (g) The  issuance  of  certificates  for  shares of the Common
Stock on  conversion  of the  Debentures  shall be made  without  charge  to the
Holders thereof for any  documentary  stamp or similar taxes that may be payable
in respect  of the issue or  delivery  of such  certificate,  provided  that the
Company  shall not be  required to pay any tax that may be payable in respect of
any transfer  involved in the issuance and delivery of any such certificate upon
conversion  in a name  other  than  that of the  Holder  of such  Debentures  so
converted  and the  Company  shall  not be  required  to issue or  deliver  such
certificates  unless or until the  person or  persons  requesting  the  issuance
thereof  shall  have paid to the  Company  the  amount of such tax or shall have
established to the satisfaction of the Company that such tax has been paid.

                  (h) Any and all notices or other  communications or deliveries
to be provided by the Holders of the Debentures  hereunder,  including,  without
limitation, any Conversion Notice, shall be in writing and delivered personally,
by facsimile,  sent by a nationally recognized overnight courier service or sent
by certified or registered mail, postage prepaid,  addressed to the Company,  at
10 Forge Park,  Franklin,  MA 02038 (facsimile number (508) 581-7990,  attention
Chief Executive Officer with copy to Mintz,  Levin,  Cohn,  Ferris,  Glovsky and
Popeo,  P.C.,  attention Neil H. Aronson  (facsimile number (617) 542-2241),  or
such other  address or  facsimile  number as the  Company  may  specify for such
purposes by notice to the Holders delivered in accordance with this Section. Any
and all  notices or other  communications  or  deliveries  to be provided by the
Company  hereunder shall be in writing and delivered  personally,  by facsimile,
sent by a nationally  recognized  overnight courier service or sent by certified
or registered mail, postage prepaid,  addressed to each Holder of the Debentures
at the  facsimile  telephone  number or address of such Holder  appearing on the
books of the  Company,  or if no such  facsimile  telephone  number  or  address
appears,  at the 


                                       13








principal place of business of the holder. Any notice or other  communication or
deliveries  hereunder shall be deemed given and effective on the earliest of (i)
the date of  transmission,  if such notice or  communication  is  delivered  via
facsimile at the facsimile  telephone  number specified in this Section prior to
4:30 p.m. (New York City time), (ii) the date after the date of transmission, if
such  notice or  communication  is  delivered  via  facsimile  at the  facsimile
telephone  number  specified in this Section later than 4:30 p.m. (New York City
time) on any date and earlier than 11:59 p.m. (New York City time) on such date,
(iii) four days after deposit in the United States mails,  (iv) the Business Day
following  the  date of  mailing,  if send by  nationally  recognized  overnight
courier service,  or (v) upon actual receipt by the party to whom such notice is
required to be given.

                  Section 5.   Company Conversion.

                  Provided  that the  average  Per  Share  Market  Value for any
consecutive 30 Trading Day period  commencing on the Original Issue Date exceeds
the  Initial  Conversion  Price  by more  than  50%,  this  Debenture  shall  be
convertible  in whole or in part into a number of shares of Common  Stock at the
Conversion  Price at the  option of the  Company;  provided,  however,  that the
Company is not  permitted  to deliver a Company  Conversion  Notice (as  defined
below) within 10 days after issuing any press release or other public  statement
relating  to such  conversion  or at any  time  when the  Underlying  Securities
Registration  Statement is not then  effective or shares of Common Stock are not
listed for trading.  The Company  shall effect such  conversion by delivering to
the  Holder a written  notice  in the form  attached  hereto  as  Exhibit B (the
"Company Conversion Notice"), which Company Conversion Notice, once given, shall
be  irrevocable.  Each Company  Conversion  Notice shall  specify the  principal
amount together with accrued interest of Debentures to be converted. The Company
shall  deliver  such  Company  Conversion  Notice at least two (2) Trading  Days
before the Maturity  Date or the date of  conversion  (such date is  hereinafter
referred to as the  "Company  Conversion  Date").  Upon its receipt of a Company
Conversion Notice, the Holder shall surrender the principal amount of Debentures
subject to such notice at the office of the Company or of any transfer agent for
the  Debentures  or Common  Stock.  If the Company is  converting  less than the
aggregate principal amount of all Debentures, the Company shall, upon conversion
of the principal amount of Debentures  subject to such Company Conversion Notice
and receipt of the Debentures surrendered for conversion, deliver to the Holder,
a replacement Debenture for such principal amount of Debentures as have not been
converted. Each of a Holder Conversion Notice and a Company Conversion Notice is
sometimes  referred to herein as a  "Conversion  Notice,"  and each of a "Holder
Conversion Date" and a "Company Conversion Date" is sometimes referred to herein
as a "Conversion Date."

                  Section 6. Definitions. For the purposes hereof, the following
terms shall have the following meanings:

                  "Adjustment  Amount" is equal to (i) the  aggregate  principal
amount of Debentures  then  outstanding  multiplied by (A) the average Per Share
Market Value for the five Trading Days immediately  preceding (1) the applicable
Trigger  Date or (2) the date of payment of all  amounts due as a result of such
Event of Default, whichever is greater, divided 

  
                                       14







by (B) the Conversion  Price with respect to the aggregate  principal  amount of
Debentures then  outstanding  calculated on the applicable  Trigger Date,  minus
(ii) the aggregate  principal  amount of Debentures then  outstanding,  plus all
accrued and unpaid interest  thereon and all other amounts due, except for those
referred to in (i) above pursuant to the terms hereof.

                  "Business Day" means any day except  Saturday,  Sunday and any
day which shall be a legal holiday or a day on which banking institutions in New
York City or in the  Province  of British  Columbia,  Canada are  authorized  or
required by law or other government action to close.

                  "Common Stock" means the Company's  common stock,  without par
value,  of the  Company  and stock of any other class into which such shares may
hereafter have been reclassified or changed.

                  "Original  Issue  Date"  shall  mean  the  date  of the  first
issuance  of  any  Debentures  regardless  of the  number  of  transfers  of any
Debenture  and  regardless of the number of  instruments  which may be issued to
evidence such Debenture.

                  "Per Share Market Value" means on any particular  date (a) the
closing  bid price per share of the  Common  Stock on such date on the  American
Stock Exchange or other stock  exchange or quotation  system on which the Common
Stock is then listed or if there is no such price on such date, then the closing
bid price on such  exchange or quotation  system on the date  nearest  preceding
such date,  or (b) if the Common Stock is not listed then on the American  Stock
Exchange or any stock exchange or quotation system,  the closing bid price for a
share of Common Stock in the over-the-counter  market, as reported by the Nasdaq
Stock  Market  or in the  National  Quotation  Bureau  Incorporated  or  similar
organization or agency  succeeding to its functions of reporting  prices) at the
close of business on such date,  or (c) if the Common Stock is not then reported
by the National Quotation Bureau Incorporated (or similar organization or agency
succeeding to its functions of reporting prices),  then the average of the "Pink
Sheet" quotes for the relevant conversion period, as determined in good faith by
the  Holder,  or (d) if the Common  Stock is not then  publicly  traded the fair
market value of a share of Common Stock as determined  by an appraiser  selected
in good faith by the  Holders  of a  majority  in  interest  of the  Debentures;
provided,  however, that the Company, after receipt of the determination by such
appraiser,  shall  have the right to select an  additional  appraiser,  in which
case, the fair market value shall be equal to the average of the  determinations
by each such appraiser.

                  "Person" means a corporation,  an association,  a partnership,
organization,  a business, an individual,  a government or political subdivision
thereof or a governmental agency.

                  "Registration  Rights Agreement" means the Registration Rights
Agreement,  dated July 17, 1997,  among the Company and the original  holders of
Debentures.


                                       15







                  "Trading  Day"  means (a) a day on which the  Common  Stock is
traded on the American Stock Exchange or other stock exchange or market on which
the Common  Stock has been  listed,  or (b) if the Common Stock is not listed on
the Nasdaq SmallCap  Market or any stock exchange or market,  a day on which the
Common Stock is traded in the  over-the-counter  market,  as reported by the OTC
Bulletin  Board,  or (c) if the Common  Stock is not quoted on the OTC  Bulletin
Board, a day on which the Common Stock is quoted in the over-the-counter  market
as  reported  by the  National  Quotation  Bureau  Incorporated  (or any similar
organization or agency succeeding its functions of reporting prices).

                  "Trigger  Date"  shall mean,  (i) with  respect to an Event of
Default  caused by an event  described in Section 3(a),  the date the payment of
principal or interest at issue was due, (ii) with respect to an Event of Default
caused by an event  described in Section 3(b),  the date  specified in any other
provision of this Debenture,  the Purchase Agreement or the Registration  Rights
Agreement that require  prepayment of the outstanding  principal  amount of this
Debenture as a result of an event so  contemplated,  if not, the date such event
becomes an Event of Default  pursuant to Section 3(b), and (iii) with respect to
an Event of Default caused by an event  described in Section 3(c),  (d), (e) and
(f), the date such event becomes an Event of Default pursuant to such Sections.

                  "Underlying Shares" means the number of shares of Common Stock
into which the  Debentures are  convertible in accordance  with the terms hereof
and the Purchase Agreement.

                  Section 7. Except as expressly  provided herein,  no provision
of this Debenture shall alter or impair the obligation of the Company,  which is
absolute  and  unconditional,  to pay the  principal  of, and  interest on, this
Debenture at the time,  place,  and rate,  and in the coin or  currency,  herein
prescribed. This Debenture is a direct obligation of the Company. This Debenture
ranks pari passu with all other  Debentures  now or  hereafter  issued under the
terms set forth herein.  The Company may only voluntarily prepay the outstanding
principal amount on the Debentures in accordance with Section 5 hereof.

                  Section 8. This Debenture  shall not entitle the Holder to any
of the rights of a stockholder of the Company, including without limitation, the
right to vote, to receive dividends and other  distributions,  or to receive any
notice of, or to attend,  meetings of stockholders  or any other  proceedings of
the Company,  unless and to the extent  converted into shares of Common Stock in
accordance with the terms hereof.

                  Section 9. If this Debenture shall be mutilated,  lost, stolen
or  destroyed,   the  Company  shall  execute  and  deliver,   in  exchange  and
substitution for and upon cancellation of a mutilated  Debenture,  or in lieu of
or in substitution for a lost,  stolen or destroyed  debenture,  a new Debenture
for the  principal  amount  of this  Debenture  so  mutilated,  lost,  stolen or
destroyed but only upon receipt of evidence of such loss,  theft or  destruction
of such Debenture, and of the ownership hereof, and indemnity, if requested, all
reasonably satisfactory to the Company.


                                       16







                  Section 10. This Debenture  shall be governed by and construed
in accordance  with the laws of the State of New York,  without giving effect to
conflicts of laws thereof.

                  Section  11.  Any  waiver by the  Company  or the  Holder of a
breach of any provision of this  Debenture  shall not operate as or be construed
to be a waiver of any other  breach of such  provision  or of any  breach of any
other provision of this  Debenture.  The failure of the Company or the Holder to
insist  upon  strict  adherence  to any  term of this  Debenture  on one or more
occasions  shall not be  considered  a waiver or deprive that party of the right
thereafter  to insist  upon strict  adherence  to that term or any other term of
this Debenture. Any waiver must be in writing.

                  Section 12. If any  provision  of this  Debenture  is invalid,
illegal or unenforceable,  the balance of this Debenture shall remain in effect,
and if any provision is  inapplicable  to any person or  circumstance,  it shall
nevertheless remain applicable to all other persons and circumstances.

                  Section 13. Whenever any payment or other obligation hereunder
shall be due on a day other than a Business  Day,  such payment shall be made on
the next succeeding Business Day (or, if such next succeeding Business Day falls
in the next  calendar  month,  the  preceding  Business  Day in the  appropriate
calendar month).

                   [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK
                            SIGNATURE PAGE TO FOLLOW]


                                       17







                  IN WITNESS WHEREOF,  the Company has caused this instrument to
be duly executed by an officer  thereunto  duly  authorized as of the date first
above indicated.


                                        PLC SYSTEMS INC.



                                        By:________________________________
                                             Name:
                                             Title:

Attest:



By:___________________________
   Name:
   Title:

                                       18







EXHIBIT A

                              NOTICE OF CONVERSION

(To be Executed by the Registered Holder
in order to Convert the Debenture)

The undersigned hereby elects to convert Debenture No. [ ] into shares of Common
Stock,  no par value per share (the "Common  Stock"),  of PLC Systems Inc.  (the
"Company")  according to the conditions hereof, as of the date written below. If
shares  are to be issued in the name of a person  other  than  undersigned,  the
undersigned  will pay all transfer  taxes  payable  with respect  thereto and is
delivering  herewith such  certificates and opinions as reasonably  requested by
the Company in  accordance  therewith.  No fee will be charged to the holder for
any conversion, except for such transfer taxes, if any.

Conversion calculations:
                            ----------------------------------------------------
                            Date to Effect Conversion


                            ----------------------------------------------------
                            Principal Amount of Debentures to be Converted


                            ----------------------------------------------------
                            Number of shares of Common Stock to be Issued


                            ----------------------------------------------------
                            Applicable Conversion Price


                            ----------------------------------------------------
                            Signature


                            ----------------------------------------------------
                            Name

                            ----------------------------------------------------
                            Address

The Company  undertakes to promptly upon its receipt of this  conversion  notice
(and, in any case prior to the time it effects the conversion requested hereby),
notify  the  converting  holder by  facsimile  of the number of shares of Common
Stock  outstanding  on such date and the number of shares of Common  Stock which
would be issuable to the holder if the conversion  requested in this  conversion
notice were effected in full,  whereupon,  if the Company  determines  that such
conversion  would  result in it  owning  in excess of 4.999% of the  outstanding
shares of Common Stock on such date,  the Company  shall convert up to an amount
equal to 4.999%  of the  outstanding  shares  of  Common  Stock and issue to the
holder  one or more  certificates  representing  Debentures  which have not been
converted as a result of this provision.


                                       19








                                    EXHIBIT B

                                PLC SYSTEMS INC.

                              NOTICE OF CONVERSION
                         AT THE ELECTION OF THE COMPANY


The  undersigned  in the name and on behalf of PLC SYSTEMS INC. (the  "Company")
hereby notifies the addressee  hereof that the Company hereby elects to exercise
its right to convert the above Debenture No. [ ] into shares of Common Stock, no
par  value  per share  (the  Common  Stock ), of the  Company  according  to the
conditions  hereof,  as of the date written below. No fee will be charged to the
Holder for any conversion  hereunder,  except for such transfer  taxes,  if any,
which may be incurred by the Company if shares are to be issued in the name of a
person other than the person to whom this notice is addressed.

Conversion calculations:
                            ----------------------------------------------------
                            Date to Effect Conversion


                            ----------------------------------------------------
                            Principal Amount of Debentures to be Converted


                            ----------------------------------------------------
                            Number of shares of Common Stock to be Issued


                            ----------------------------------------------------
                            Applicable Conversion Price


                            ----------------------------------------------------
                            Signature


                            ----------------------------------------------------
                            Name:


                            ----------------------------------------------------
                            Address:








EXHIBIT 10e


NEITHER THIS WARRANT NOR THE  SECURITIES  INTO WHICH THIS WARRANT IS EXERCISABLE
HAVE  BEEN  REGISTERED  WITH  THE  SECURITIES  AND  EXCHANGE  COMMISSION  OR THE
SECURITIES   COMMISSION  OF  ANY  STATE  IN  RELIANCE  UPON  AN  EXEMPTION  FROM
REGISTRATION  UNDER THE  SECURITIES  ACT OF 1933,  AS AMENDED  (THE  "SECURITIES
ACT"),  AND,  ACCORDINGLY,  MAY NOT BE OFFERED  OR SOLD  EXCEPT  PURSUANT  TO AN
EFFECTIVE  REGISTRATION  STATEMENT  UNDER THE  SECURITIES  ACT OR PURSUANT TO AN
AVAILABLE  EXEMPTION  FROM  THE  REGISTRATION  REQUIREMENTS  THEREUNDER  AND  IN
COMPLIANCE WITH APPLICABLE STATE SECURITIES OR BLUE SKY LAWS.


                                PLC SYSTEMS INC.

                               REDEEMABLE WARRANT
                               ------------------

Warrant No. 003                                              Dated July 17, 1997


         PLC Systems Inc., a corporation  organized and existing  under the laws
of British  Columbia,  Canada (the "Company"),  hereby certifies that, for value
received,  HBK Offshore  Fund Ltd., or its  registered  assigns  ("Holder"),  is
entitled,  subject to the terms set forth below, to purchase from the Company up
to a total of 16,250 shares of Common Stock, no par value (the "Common  Stock"),
of the Company  (each such share,  a "Warrant  Share" and all such  shares,  the
"Warrant  Shares") at an exercise  price equal to $27.81 per share (as  adjusted
from time to time as provided in Section 8, the "Exercise  Price"),  at any time
and from time to time from and after the date hereof and  through and  including
July 17, 2002 or earlier as provided herein (the "Expiration Date"), and subject
to the following terms and conditions:

         1.  Registration  of Warrant.  The Company shall register this Warrant,
upon records to be  maintained  by the Company for that  purpose  (the  "Warrant
Register"),  in the name of the  record  Holder  hereof  from time to time.  The
Company may deem and treat the registered Holder of this Warrant as the absolute
owner hereof for the purpose of any exercise  hereof or any  distribution to the
Holder,  and for all other  purposes,  and the Company  shall not be affected by
notice to the contrary.

         2.       Registration of Transfers and Exchanges.

                  (a) The Company shall  register the transfer of any portion of
this Warrant in the Warrant Register,  upon surrender of this Warrant,  with the
Form of Assignment  attached hereto duly completed and signed, to the Company at
the office specified in or pursuant to Section 3(b). Upon any such  registration
or transfer,  a new warrant to purchase Common






Stock, in substantially  the form of this Warrant (any such new warrant,  a "New
Warrant"), evidencing the portion of this Warrant so transferred shall be issued
to the  transferee and a New Warrant  evidencing  the remaining  portion of this
Warrant not so transferred,  if any, shall be issued to the transferring Holder.
The acceptance of the New Warrant by the transferee  thereof shall be deemed the
acceptance of such  transferee of all of the rights and  obligations of a holder
of a Warrant.

                  (b) This Warrant is exchangeable, upon the surrender hereof by
the Holder to the office of the Company specified in or pursuant to Section 3(b)
for one or more New Warrants,  evidencing in the aggregate the right to purchase
the number of Warrant Shares which may then be purchased hereunder. Any such New
Warrant will be dated the date of such exchange.

         3.       Duration, Exercise of Warrants and Redemption.

                  (a) This Warrant shall be exercisable by the registered Holder
on any business day before 5:30 P.M.,  New York time,  at any time and from time
to time on or after the date hereof to and  including  the  Expiration  Date. At
5:30 P.M., New York time on the Expiration Date, the portion of this Warrant not
exercised prior thereto shall be and become void and of no value.

                  (b) Subject to Sections 2(b), 6 and 10, upon surrender of this
Warrant,  with the Form of Election to Purchase  attached  hereto duly completed
and signed, to the Company at its office at 10 Forge Park,  Franklin,  MA 02038,
Attention:  Chief Financial Officer, or at such other address as the Company may
specify  in  writing  to the then  registered  Holder,  and upon  payment of the
Exercise  Price  multiplied  by the  number of  Warrant  Shares  that the Holder
intends to purchase hereunder,  in lawful money of the United States of America,
in cash or by  certified or official  bank check or checks,  all as specified by
the Holder in the Form of Election to Purchase,  the Company shall promptly (but
in no event later than 3 business  days after the Date of  Exercise  (as defined
herein))  issue or cause to be issued and cause to be  delivered  to or upon the
written  order  of the  Holder  and in such  name or  names  as the  Holder  may
designate,  a certificate  for the Warrant  Shares  issuable upon such exercise,
free of restrictive  legends other than as required by the Purchase Agreement of
even date herewith between the Holder and the Company.  Any person so designated
by the Holder to receive Warrant Shares shall be deemed to have become holder of
record of such Warrant Shares as of the Date of Exercise of this Warrant.

                  A "Date of Exercise" means the date on which the Company shall
have  received (i) this Warrant (or any New Warrant,  as  applicable),  with the
Form of Election to Purchase  attached  hereto (or attached to such New Warrant)
appropriately  completed and duly signed, and (ii) payment of the Exercise Price
for the  number  of  Warrant  Shares so  indicated  by the  holder  hereof to be
purchased.

                  (c) This Warrant shall be exercisable,  either in its entirety
or, from time to time,  for a portion of the number of Warrant  Shares.  If less
than all of the Warrant  Shares



                                       2


which may be purchased under this Warrant are exercised at any time, the Company
shall issue or cause to be issued, at its expense,  a New Warrant evidencing the
right to purchase the remaining  number of Warrant  Shares for which no exercise
has been evidenced by this Warrant.

                  (d) If the average  closing sale price of the Common Stock for
any  consecutive 30 Trading Day period  commencing  January 17, 1999 exceeds the
Exercise  Price by more than 50%, the Company shall have the right,  exercisable
at any time upon 30 days  notice to the Holder  given at any time after  January
17,  1999,  to redeem  this  Warrant at a price of $.10 per Warrant  Share.  Any
portion of this Warrant not  exercised by 5:00 p.m.  (New York time) on the 30th
day  following  such notice  (the  "Redemption  Date")  shall be returned to the
Company and the Company shall issue  therefor in full and complete  satisfaction
of its obligations under such remaining portion to the Holder an amount equal to
the number of shares of Common Stock then issuable hereunder  multiplied by $.10
per share (the "Redemption Price"). The Redemption Price shall be payable to the
Holder and shall be mailed to such persons at their  address of record,  and the
Warrant  shall be  cancelled.  The Holder may exercise  this Warrant  during the
period from the date of such call notice through the 29th day thereafter.

         4. Piggyback  Registration Rights.  During the term of this Warrant the
Company may not file any registration statement with the Securities and Exchange
Commission (other than registration  statements of the Company filed on Form S-8
or Form S-4  including  supplements  thereto)  at any time when  there is not an
effective  registration  statement covering the resale of the Warrant Shares and
naming  the Holder as a selling  stockholder  thereunder,  but not  additionally
filed  registration   statements  in  respect  of  such  securities),   each  as
promulgated under the Securities Act of 1933, as amended,  pursuant to which the
Company is registering securities pursuant to a Company employee benefit plan or
pursuant to a merger,  acquisition  or similar  transaction)  unless the Company
provides  the Holder with not less than 20 days notice to each of the Holder and
Robinson Silverman Peace Aronsohn & Berman LLP, attention Eric L. Cohen,  notice
of its intention to file such registration statement and provides the Holder the
option to include  any or all of the  applicable  Warrant  Shares  therein.  The
piggyback  registration  rights  granted to the Holder  pursuant to this Section
shall  continue  until  all of the  Holder's  Warrant  Shares  have been sold in
accordance  with an effective  registration  statement or upon the expiration of
this  Warrant.  The Company  will pay all  registration  expenses in  connection
therewith.

         5. Payment of Taxes.  The Company will pay all documentary  stamp taxes
attributable  to the  issuance  of  Warrant  Shares  upon the  exercise  of this
Warrant;  provided,  however,  that the Company shall not be required to pay any
tax which may be payable in respect of any transfer involved in the registration
of any  certificates for Warrant Shares or Warrants in a name other than that of
the Holder, and the Company shall not be required to issue or cause to be issued
or deliver or cause to be delivered the  certificates  for Warrant Shares unless
or until the person or persons  requesting the issuance  thereof shall have paid
to the  Company  the  amount  of  such  tax or  shall  have  established  to the
satisfaction  of the Company  that such tax has been paid.  The Holder  shall be
responsible for all other tax



                                       3


liability that may arise as a result of holding or transferring  this Warrant or
receiving Warrant Shares upon exercise hereof.

         6. Replacement of Warrant.  If this Warrant is mutilated,  lost, stolen
or destroyed,  the Company may in its discretion  issue or cause to be issued in
exchange and substitution for and upon  cancellation  hereof,  or in lieu of and
substitution for this Warrant, a New Warrant,  but only upon receipt of evidence
reasonably  satisfactory  to the Company of such loss,  theft or destruction and
indemnity,  if reasonably satisfactory to it. Applicants for a New Warrant under
such circumstances shall also comply with such other reasonable  regulations and
procedures and pay such other reasonable charges as the Company may prescribe.

         7. Reservation of Warrant Shares. The Company covenants that it will at
all times reserve and keep  available out of the aggregate of its authorized but
unissued  Common  Stock,  solely for the purpose of enabling it to issue Warrant
Shares upon exercise of this Warrant as herein  provided,  the number of Warrant
Shares which are then issuable and deliverable  upon the exercise of this entire
Warrant,  free from preemptive  rights or any other actual  contingent  purchase
rights of persons  other than the Holders  (taking into account the  adjustments
and  restrictions  of Section 8). The Company  covenants that all Warrant Shares
that shall be so issuable and deliverable  shall,  upon issuance and the payment
of the applicable  Exercise Price in accordance  with the terms hereof,  be duly
and validly authorized, issued and fully paid and nonassessable.

         8. Certain Adjustments. The Exercise Price and number of Warrant Shares
issuable upon  exercise of this Warrant are subject to  adjustment  from time to
time as set forth in this Section 8. Upon each such  adjustment  of the Exercise
Price  pursuant  to this  Section 8, the Holder  shall  thereafter  prior to the
Expiration  Date be entitled to purchase,  at the Exercise Price  resulting from
such  adjustment,  the number of Warrant  Shares  obtained  by  multiplying  the
Exercise Price in effect  immediately  prior to such adjustment by the number of
Warrant Shares issuable upon exercise of this Warrant  immediately prior to such
adjustment and dividing the product thereof by the Exercise Price resulting from
such adjustment.

                  (a)  If the  Company,  at  any  time  while  this  Warrant  is
outstanding,  (i) shall pay a stock dividend or otherwise make a distribution or
distributions  on shares of its Common Stock (as defined  below) or on any other
class of  capital  stock and not the Common  Stock)  payable in shares of Common
Stock, (ii) subdivide outstanding shares of Common Stock into a larger number of
shares,  or (iii)  combine  outstanding  shares of Common  Stock  into a smaller
number of shares,  the Exercise Price shall be multiplied by a fraction of which
the numerator shall be the number of shares of Common Stock (excluding  treasury
shares, if any) outstanding before such event and of which the denominator shall
be the number of shares of Common  Stock  (excluding  treasury  shares,  if any)
outstanding after such event. Any adjustment made pursuant to this Section shall
become  effective  immediately  after the record date for the  determination  of
stockholders  entitled to receive such dividend or distribution and shall become
effective  immediately  after the effective date in the case of a subdivision or
combination, and shall apply to successive subdivisions and combinations.



                                       4



                  (b) In case of any  reclassification  of the Common Stock, any
consolidation or merger of the Company with or into another person,  the sale or
transfer of all or  substantially  all of the assets of the Company in which the
consideration  therefor  is  equity  or  equity  equivalent  securities  or  any
compulsory  share exchange  pursuant to which the Common Stock is converted into
other securities or property, then the Holder shall have the right thereafter to
exercise  this  Warrant only into the shares of stock and other  securities  and
property  receivable  upon or  deemed  to be held by  holders  of  Common  Stock
following such reclassification,  consolidation, merger, sale, transfer or share
exchange,  and the Holder  shall be  entitled  upon such  event to receive  such
amount of  securities  or  property  equal to the amount of Warrant  Shares such
Holder  would have been  entitled  to had such  Holder  exercised  this  Warrant
immediately  prior  to  such  reclassification,   consolidation,  merger,  sale,
transfer or share exchange.  The terms of any such consolidation,  merger, sale,
transfer or share exchange shall include such terms so as to continue to give to
the Holder the right to receive the  securities  or  property  set forth in this
Section   8(b)  upon  any   exercise   following   any  such   reclassification,
consolidation, merger, sale, transfer or share exchange.

                  (c)  If the  Company,  at  any  time  while  this  Warrant  is
outstanding, shall distribute to all holders of Common Stock (and not to holders
of this Warrant)  evidences of its  indebtedness or assets or rights or warrants
to  subscribe  for or purchase  any  security  (excluding  those  referred to in
Sections 8(a), (b) and (d)),  then in each such case the Exercise Price shall be
determined by multiplying the Exercise Price in effect  immediately prior to the
record date fixed for  determination  of  stockholders  entitled to receive such
distribution by a fraction of which the denominator  shall be the Exercise Price
determined  as of the record date  mentioned  above,  and of which the numerator
shall be such Exercise Price on such record date less the then fair market value
at such record date of the portion of such assets or evidence of indebtedness so
distributed applicable to one outstanding share of Common Stock as determined by
a nationally  recognized or major  regional  investment  banking firm or firm of
independent  certified public  accountants of recognized  standing (which may be
the firm that  regularly  examines the financial  statements of the Company) (an
"Appraiser")  mutually  selected  in good faith by the  holders of a majority in
interest of the Warrants then  outstanding  and the Company.  Any  determination
made by the Appraiser shall be final..

                  (d) If, at any time while this  Warrant  is  outstanding,  the
Company  shall  issue or cause to be issued  rights or  warrants  to  acquire or
otherwise  sell or  distribute  shares of Common  Stock to all holders of Common
Stock for a consideration per share less than the Exercise Price then in effect,
then,  forthwith upon such issue or sale, the Exercise Price shall be reduced to
the price  (calculated to the nearest cent) determined by dividing (i) an amount
equal  to the sum of (A) the  number  of  shares  of  Common  Stock  outstanding
immediately  prior to such issue or sale multiplied by the Exercise  Price,  and
(B) the  consideration,  if any, received or receivable by the Company upon such
issue or sale by (ii) the total  number of  shares of Common  Stock  outstanding
immediately after such issue or sale.

                  (e) For the purposes of this Section 8, the following  clauses
shall also be applicable:



                                       5



                           (i) Record  Date.  In case the  Company  shall take a
record of the holders of its Common Stock for the purpose of entitling  them (A)
to  receive a  dividend  or other  distribution  payable  in Common  Stock or in
securities  convertible or  exchangeable  into shares of Common Stock, or (B) to
subscribe for or purchase Common Stock or securities convertible or exchangeable
into  shares of Common  Stock,  then such  record date shall be deemed to be the
date of the  issue or sale of the  shares of  Common  Stock  deemed to have been
issued or sold upon the declaration of such dividend or the making of such other
distribution  or the  date of the  granting  of such  right of  subscription  or
purchase, as the case may be.

                           (ii) Treasury Shares.  The number of shares of Common
Stock outstanding at any given time shall not include shares owned or held by or
for the account of the Company,  and the disposition of any such shares shall be
considered an issue or sale of Common Stock.

                  (f) All calculations under this Section 8 shall be made to the
nearest cent or the nearest 1/100th of a share, as the case may be.

                      If:

                           (i)    the Company  shall  declare a dividend (or any
                                  other distribution) on its Common Stock; or

                           (ii)   the   Company    shall   declare   a   special
                                  nonrecurring  cash dividend on or a redemption
                                  (other  than   redemptions  of  the  stock  of
                                  employees upon their termination of employment
                                  with the Company in an aggregate amount not to
                                  exceed $1,000,000,  calculated by reference to
                                  the market  price of the Common  Stock at such
                                  time) of its Common Stock; or

                           (iii)  the Company  shall  authorize  the granting to
                                  all  holders  of the  Common  Stock  rights or
                                  warrants  to  subscribe  for or  purchase  any
                                  shares of capital stock of any class or of any
                                  rights; or

                           (iv)   the  approval  of  any   stockholders  of  the
                                  Company shall be required in  connection  with
                                  any  reclassification  of the Common  Stock of
                                  the Company,  any  consolidation  or merger to
                                  which  the  Company  is a  party,  any sale or
                                  transfer  of all or  substantially  all of the
                                  assets of the Company, or any compulsory share
                                  exchange whereby the Common Stock is converted
                                  into other securities, cash or property; or




                                       6


                           (v)    the  Company  shall  authorize  the  voluntary
                                  dissolution,  liquidation or winding up of the
                                  affairs of the Company,

then the Company shall cause to be mailed to each Holder at their last addresses
as they shall appear upon the Warrant Register,  at least 30 calendar days prior
to the  applicable  record or effective  date  hereinafter  specified,  a notice
stating  (x) the date on which a record is to be taken for the  purpose  of such
dividend, distribution, redemption, rights or warrants, or if a record is not to
be taken,  the date as of which  the  holders  of  Common  Stock of record to be
entitled to such dividend, distributions,  redemption, rights or warrants are to
be  determined  or (y) the date on which such  reclassification,  consolidation,
merger,  sale,  transfer or share  exchange is expected to become  effective  or
close,  and the date as of which it is expected  that holders of Common Stock of
record  shall  be  entitled  to  exchange  their  shares  of  Common  Stock  for
securities,  cash or other  property  deliverable  upon  such  reclassification,
consolidation,  merger, sale, transfer, share exchange, dissolution, liquidation
or winding up;  provided,  however,  that the failure to mail such notice or any
defect  therein or in the mailing  thereof  shall not affect the validity of the
corporate action required to be specified in such notice.

         9.  Fractional  Shares.  The Company  shall not be required to issue or
cause to be issued  fractional  Warrant  Shares on the exercise of this Warrant.
The number of full Warrant  Shares which shall be issuable  upon the exercise of
this Warrant shall be computed on the basis of the  aggregate  number of Warrant
Shares purchasable on exercise of this Warrant so presented.  If any fraction of
a Warrant Share would,  except for the provisions of this Section 9, be issuable
on the exercise of this Warrant,  the Company shall,  at its option,  (i) pay an
amount in cash equal to the Exercise  Price  multiplied by such fraction or (ii)
round the number of Warrant Shares issuable, up to the next whole number.

         10. Notices.  Any and all notices or other communications or deliveries
hereunder  shall be in writing and shall be deemed  given and  effective  on the
earliest of (i) the date of  transmission,  if such notice or  communication  is
delivered  via  facsimile at the facsimile  telephone  number  specified in this
Section prior to 4:30 p.m.  (Eastern  Standard Time) on a business day, (ii) the
business day after the date of transmission,  if such notice or communication is
delivered  via  facsimile at the facsimile  telephone  number  specified in this
Section  later than 4:30 p.m.  (Eastern  Standard  Time) on any date and earlier
than 11:59 p.m.  (Eastern  Standard  Time) on such date,  (iii) the business day
following  the  date of  mailing,  if sent by  nationally  recognized  overnight
courier service, or (iv) upon actual receipt by the party to whom such notice is
required to be given. The addresses for such communications  shall be: (1) if to
the Company, to PLC Systems Inc., 10 Forge Park, Franklin, MA 02038,  Attention:
Chief  Financial  Officer,  or to facsimile  no. (508)  541-7990  with a copy to
Mintz, Levin, Cohn, Ferris, Glovsky & Popeo, P.C., One Financial Center, Boston,
MA 02111, Attention:  Neil H. Aronson or (ii) if to the Holder, to the Holder at
the address or facsimile  number appearing on the Warrant Register or such other
address  or  facsimile  number as the  Holder  may  provide  to the  Company  in
accordance with this Section 10.

         11.      Warrant Agent.




                                       7


                  (a) The  Company  shall  serve as  warrant  agent  under  this
Warrant.  Upon thirty (30) days' notice to the Holder, the Company may appoint a
new warrant agent.

                  (b) Any corporation  into which the Company or any new warrant
agent may be merged or any corporation resulting from any consolidation to which
the Company or any new  warrant  agent  shall be a party or any  corporation  to
which the Company or any new warrant agent  transfers  substantially  all of its
corporate trust or shareholders  services  business shall be a successor warrant
agent under this Warrant  without any further act.  Any such  successor  warrant
agent shall  promptly  cause  notice of its  succession  as warrant  agent to be
mailed (by first class mail, postage prepaid) to the Holder at the Holder's last
address as shown on the Warrant Register.

         12.      Miscellaneous.

                  (a) This Warrant  shall be binding on and inure to the benefit
of the parties hereto and their  respective  successors  and permitted  assigns.
This  Warrant  may be amended  only in  writing  signed by the  Company  and the
Holder.

                  (b) Subject to Section 12(a),  above,  nothing in this Warrant
shall be construed to give to any person or  corporation  other than the Company
and the Holder any legal or equitable right, remedy or cause under this Warrant;
this Warrant shall be for the sole and exclusive  benefit of the Company and the
Holder.

                  (c)  This  Warrant  shall be  governed  by and  construed  and
enforced in  accordance  with the internal laws of the State of New York without
regard to the principles of conflicts of law thereof.

                  (d) The  headings  herein  are for  convenience  only,  do not
constitute a part of this Warrant and shall not be deemed to limit or affect any
of the provisions hereof.

                  (e) In case any one or more of the  provisions of this Warrant
shall  be  invalid  or   unenforceable   in  any   respect,   the  validity  and
enforceability  of the remaining  terms and provisions of this Warrant shall not
in any way be affected or impaired  thereby and the parties will attempt in good
faith  to  agree  upon a  valid  and  enforceable  provision  which  shall  be a
commercially  reasonable  substitute  therefor,  and  upon  so  agreeing,  shall
incorporate such substitute provision in this Warrant.



                                       8



         IN WITNESS  WHEREOF,  the Company  has caused  this  Warrant to be duly
executed by its authorized officer as of the date first indicated above.


                                           PLC SYSTEMS INC.



                                           By:__________________________________

                                           Name:________________________________

                                           Title:_______________________________




                                        9



                           FORM OF ELECTION O PURCHASE

(To be executed by the Holder to exercise the right to purchase shares of Common
Stock under the foregoing Warrant)

To PLC Systems Inc.:

         In accordance  with the Warrant  enclosed with this Form of Election to
Purchase,  the undersigned hereby  irrevocably elects to purchase  _____________
shares of Common Stock ("Common  Stock"),  no par value, of PLC Systems Inc. and
encloses  herewith  $________  in cash or  certified  or official  bank check or
checks,  which sum  represents  the aggregate  Exercise Price (as defined in the
Warrant) for the number of shares of Common Stock to which this Form of Election
to  Purchase  relates,  together  with  any  applicable  taxes  payable  by  the
undersigned pursuant to the Warrant.

         The  undersigned  requests that  certificates  for the shares of Common
Stock issuable upon this exercise be issued in the name of

                                               PLEASE INSERT SOCIAL SECURITY OR
                                               TAX IDENTIFICATION NUMBER
                                               ________________________________

_______________________________________________________________________________
                         (Please print name and address)
_______________________________________________________________________________

_______________________________________________________________________________


         If the number of shares of Common  Stock  issuable  upon this  exercise
shall not be all of the shares of Common Stock which the undersigned is entitled
to purchase in accordance with the enclosed  Warrant,  the undersigned  requests
that a New Warrant (as defined in the Warrant)  evidencing the right to purchase
the shares of Common  Stock not  issuable  pursuant  to the  exercise  evidenced
hereby be issued in the name of and delivered to:

_______________________________________________________________________________
                         (Please print name and address)
_______________________________________________________________________________

_______________________________________________________________________________


Dated:____________,____                     Name of Holder:

                                            (Print)____________________________
                                            (By:)______________________________
                                            (Name:)____________________________
                                            (Title:)___________________________

(Signature  must  conform in all  respects to name of holder as specified on the
face of the Warrant)



                                       10


           [To be completed and signed only upon transfer of Warrant]

         FOR VALUE RECEIVED, the undersigned hereby sells, assigns and transfers
unto  ________________________________  the  right  represented  by  the  within
Warrant to purchase  ____________  shares of Common Stock of PLC Systems Inc. to
which the within  Warrant  relates  and  appoints  ________________  attorney to
transfer  said  right on the  books  of PLC  Systems  Inc.  with  full  power of
substitution in the premises.

Dated:
_______________, ____


                              --------------------------------------------------
                              (Signature must conform in all respects to name of
                              holder as specified on the face of the Warrant)


                              --------------------------------------------------
                              Address of Transferee

                              --------------------------------------------------

                              --------------------------------------------------



In the presence of:


- ----------------------------------

                                       11



EXHIBIT 10f


                          REGISTRATION RIGHTS AGREEMENT
                          -----------------------------


         This  Registration  Rights  Agreement  (this  "Agreement")  is made and
entered  into as of July  17,  1997,  among  PLC  Systems  Inc.,  a  corporation
organized  and  existing  under  the  laws  of  British  Columbia,  Canada  (the
"Company"),  Southbrook International Investments,  Ltd., a corporation existing
under the laws of the British Virgin Islands ("Southbrook"),  HBK Cayman L.P., a
Cayman Islands exempt limited partnership ("HBK Cayman"),  and HBK Offshore Fund
Ltd., a Cayman Islands exempt company ("HBK Offshore").  Southbrook,  HBK Cayman
and HBK Offshore are each referred to herein as a "Purchaser"  and  collectively
as the "Purchasers".

         This Agreement is made pursuant to the Convertible  Debenture  Purchase
Agreement, dated as of the date hereof among the Company and the Purchasers (the
"Purchase Agreement").

         The Company and the Purchasers hereby agree as follows:

         1.       Definitions

                  Capitalized  terms used and not otherwise defined herein shall
have the meanings  given such terms in the Purchase  Agreement.  As used in this
Agreement, the following terms shall have the following meanings:

                  "Advice" shall have meaning set forth in Section 3(o).

                  "Affiliate"  means,  with  respect  to any  Person,  any other
Person that directly or indirectly  controls or is controlled by or under common
control with such Person.  For the purposes of this definition,  "control," when
used with respect to any Person,  means the possession,  direct or indirect,  of
the power to direct or cause the  direction  of the  management  and policies of
such Person, whether through the ownership of voting securities,  by contract or
otherwise;  and the terms of "affiliated,"  "controlling"  and "controlled" have
meanings correlative to the foregoing.

                  "Business Day" means any day except  Saturday,  Sunday and any
day which shall be a legal holiday or a day on which banking institutions in the
state  of New  York  generally  are  authorized  or  required  by  law or  other
government actions to close.

                  "Closing  Date"  shall  have  the  meaning  set  forth  in the
Purchase Agreement.

                  "Commission" means the Securities and Exchange Commission.






                  "Common Stock" means the Company's  Common Stock,  without par
value.

                  "Debentures"   means  Tranche  1  and  Tranche  2  Convertible
Debentures  of the Company  issued to the  Purchasers  pursuant to the  Purchase
Agreement.

                  "Effectiveness   Date"   means   (i)  with   respect   to  the
Registration Statement to be filed with respect to the Tranche 1 Debentures, the
90th day  following  the  Tranche 1 Closing  Date and (ii) with  respect  to the
Registration Statement to be filed with respect to the Tranche 2 Debentures, the
90th day following the Tranche 2 Closing Date.

                  "Effectiveness  Period"  shall have the  meaning  set forth in
Section 2(a).

                  "Exchange Act" means the  Securities  Exchange Act of 1934, as
amended.

                  "Filing  Date" means (i) with  respect to the shares of Common
Stock  issuable upon  conversion of the Tranche 1 Debentures and exercise of the
Tranche 1 Warrants,  the 30th day  following the Tranche 1 Closing Date and (ii)
with  respect to the shares of Common  Stock  issuable  upon  conversion  of the
Tranche 2  Debentures  and  exercise  of the  Tranche 2  Warrants,  the 30th day
following the Tranche 2 Closing Date.

                  "Holder" or "Holders" means the holder or holders, as the case
may be, from time to time of Registrable Securities.

                  "Indemnified  Party"  shall  have  the  meaning  set  forth in
Section 5(c).

                  "Indemnifying  Party"  shall  have the  meaning  set  forth in
Section 5(c).

                  "Losses" shall have the meaning set forth in Section 5(a).

                  "Person"  means an individual or a  corporation,  partnership,
trust,  incorporated  or  unincorporated  association,  joint  venture,  limited
liability  company,  joint stock company,  government (or an agency or political
subdivision thereof) or other entity of any kind.

                  "Proceeding" means an action,  claim,  suit,  investigation or
proceeding   (including,   without  limitation,   an  investigation  or  partial
proceeding, such as a deposition), whether commenced or threatened.

                  "Prospectus" means the prospectus included in the Registration
Statement  (including,  without  limitation,  a  prospectus  that  includes  any
information  previously  omitted from a prospectus filed as part of an effective
registration  statement  in  reliance  upon  Rule  430A  promulgated  under  the
Securities Act), as amended or supplemented by any prospectus  supplement,  with
respect  to  the  terms  of  the  offering  of any  portion  of the  Registrable
Securities covered by the Registration  Statement,  and all other amendments and
supplements to the  Prospectus,  including  post-effective  amendments,  and all
material  incorporated by reference or deemed to be incorporated by reference in
such Prospectus.



                                       2


                  "Registrable   Securities"  means  (a)  with  respect  to  the
Registration  Statement  to be filed after the Tranche 1 Closing,  the shares of
Common Stock  issuable upon (i)  conversion  of the Tranche 1  Debentures,  (ii)
exercise  of the  Tranche 1 Warrants  issued by the  Company to the  Purchasers,
(iii) payment of interest in respect of such Tranche 1 Debentures  and (iv) upon
exercise  of common  stock  purchase  warrants  issued by the  Company  to Brown
Simpson,  LLC, (b) with respect to the Registration  Statement to be filed after
the Tranche 2 Closing,  the shares of Common Stock  issuable upon (i) conversion
of the Tranche 2 Debentures,  (ii) exercise of the Tranche 2 Warrants  issued by
the Company to the  Purchasers and (iv) payment of interest with respect to such
Debentures;  provided,  however  that in order to account  for the fact that the
number of shares of Common Stock that are issuable upon conversion of Debentures
is  determined  in part upon the market price of the Common Stock at the time of
conversion,  in the case of each of (a) and (b),  Registrable  Securities  shall
include  (but not be limited to) a number of shares of Common  Stock equal to no
less  than the sum of (1) two times the  number of shares of Common  Stock  into
which the  applicable  tranche of  Debentures  are  convertible,  assuming  such
conversion  occurred  on the  particular  Closing  Date  for  such  tranches  of
Debentures,  (2) the  number of shares of Common  Stock  issuable  on payment of
interest on such Debentures during the period after the applicable  Closing Date
and (3) the number of shares of Common Stock  issuable  upon exercise in full of
the Warrants  issued at the applicable  Closing Date described  herein,  or such
other  number  of shares of  Common  Stock as  agreed to by the  parties  to the
Purchase Agreement; provided, further that the Company shall not be obligated to
register,  (A) in respect of the Tranche 1 Closing,  in excess of the sum of (i)
1,000,000  shares  of  Common  Stock  issuable  upon  conversion  of  Tranche  1
Debentures  and to pay interest in respect of the Tranche 1 Debentures in shares
of Common Stock and (ii) 65,000 shares of Common Stock issuable upon exercise of
Tranche 1 Warrants and (B) in respect of the Tranche 2 Closing, in excess of the
sum of (i) 145% of the number of shares of Common Stock issuable upon conversion
in full of the  Tranche 2  Debentures  and to pay  interest  in  respect  of the
Tranche 2  Debentures  in shares of Common  Stock and (ii) a number of shares of
Common  Stock  sufficient  to permit  exercise in full of the Tranche 2 Warrants
(whether such Warrants are issued on the Tranche 2 Closing Date or the Tranche 2
Closing Expiration Date).

                  "Registration  Statement"  means the  registration  statements
contemplated  by  Section  2(a)  (and  any  additional  Registration  Statements
contemplated  in the definition of Registrable  Securities),  including (in each
case) the Prospectus,  amendments and supplements to such registration statement
or  Prospectus,  including  pre- and  post-effective  amendments,  all  exhibits
thereto, and all material incorporated by reference or deemed to be incorporated
by reference in such registration statement.

                  "Rule  144"  means  Rule  144  promulgated  by the  Commission
pursuant to the  Securities  Act, as such Rule may be amended from time to time,
or any similar rule or regulation  hereafter  adopted by the  Commission  having
substantially the same effect as such Rule.




                                       3



                  "Rule  158"  means  Rule  158  promulgated  by the  Commission
pursuant to the  Securities  Act, as such Rule may be amended from time to time,
or any similar rule or regulation  hereafter  adopted by the  Commission  having
substantially the same effect as such Rule.

                  "Rule  415"  means  Rule  415  promulgated  by the  Commission
pursuant to the  Securities  Act, as such Rule may be amended from time to time,
or any similar rule or regulation  hereafter  adopted by the  Commission  having
substantially the same effect as such Rule.

                  "Securities Act" means the Securities Act of 1933, as amended.

                  "Special  Counsel"  means any special  counsel to the Holders,
for which the Holders will be reimbursed by the Company pursuant to Section 4.

                  "Underwritten  Registration or Underwritten  Offering" means a
registration in connection  with which  securities of the Company are sold to an
underwriter for reoffering to the public  pursuant to an effective  registration
statement.

         2.       Shelf Registration

                  (a) On or prior to each  applicable  Filing  Date the  Company
shall  prepare and file with the  Commission  a "Shelf"  Registration  Statement
covering all  Registrable  Securities for an offering to be made on a continuous
basis  pursuant to Rule 415.  The  Registration  Statement  shall be on Form S-3
(except if  otherwise  directed  by the Holders of a majority in interest of the
applicable  Registrable  Securities in accordance  herewith or if the Company is
not then eligible to register for resale the Registrable Securities on Form S-3,
in  which  case  such  registration  shall  be on  another  appropriate  form in
accordance herewith). The Company shall (i) not permit any securities other than
the Registrable Securities to be included in the Registration Statement and (ii)
use its  best  efforts  to  cause  the  Registration  Statement  to be  declared
effective  under the  Securities  Act as promptly  as possible  after the filing
thereof,  but in any event  prior to the  Effectiveness  Date,  and to keep such
Registration Statement continuously effective under the Securities Act until the
date  which is two years  after the date that  such  Registration  Statement  is
declared  effective by the Commission or such earlier date when all  Registrable
Securities covered by such Registration  Statement have been sold or may be sold
without volume restrictions pursuant to Rule 144(k) as determined by the counsel
to the Company pursuant to a written opinion letter,  addressed to the Company's
transfer agent to such effect (the "Effectiveness Period");  provided,  however,
that the Company  shall not be deemed to have used its best  efforts to keep the
Registration   Statement  effective  during  the  Effectiveness   Period  if  it
voluntarily  takes any action that would result in the Holders not being able to
sell the Registrable  Securities  covered by such Registration  Statement during
the Effectiveness Period, unless such action is required under applicable law or
the Company has filed a post-effective  amendment to the Registration  Statement
and the Commission has not declared it effective.



                                       4


                  (b) If the Holders of a majority of the Registrable Securities
so elect,  an offering of Registrable  Securities  pursuant to the  Registration
Statement  may be  effected  on one  occasions  in the  form of an  Underwritten
Offering. In such event, and if the managing underwriters advise the Company and
such  Holders  in  writing  that in their  opinion  the  amount  of  Registrable
Securities proposed to be sold in such Underwritten  Offering exceeds the amount
of Registrable Securities which can be sold in such Underwritten Offering, there
shall be included in such  Underwritten  Offering the amount of such Registrable
Securities  which in the opinion of such managing  underwriters can be sold, and
such amount  shall be  allocated  pro rata among the Holders  proposing  to sell
Registrable Securities in such Underwritten Offering.

                  (c) If any of the Registrable  Securities are to be sold in an
Underwritten  Offering,  the investment  banker in interest that will administer
the  offering  will be selected by the Holders of a majority of the  Registrable
Securities  included in such offering  upon  consultation  with the Company.  No
Holder may participate in any Underwritten Offering hereunder unless such Person
(i)  agrees to sell its  Registrable  Securities  on the basis  provided  in any
underwriting  agreements  approved by the Persons entitled  hereunder to approve
such arrangements and (ii) completes and executes all questionnaires,  powers of
attorney,  indemnities,  underwriting  agreements and other  documents  required
under the terms of such arrangements.

         3.       Registration Procedures

                  In  connection  with the  Company's  registration  obligations
hereunder, the Company shall:

                  (a) Prepare and file with the  Commission  on or prior to each
applicable Filing Date, a Registration Statement on Form S-3 (or such other form
if directed by the Holders in connection with an Underwritten Offering hereunder
or if the Company is not then  eligible to register  for resale the  Registrable
Securities  on Form S-3,  in which  case such  registration  shall be on another
appropriate  form in  accordance  herewith)  in  accordance  with the  method or
methods of distribution thereof as specified by the Holders (except if otherwise
directed  by the  Holders),  and  cause  the  Registration  Statement  to become
effective and remain effective as provided herein;  provided,  however, that not
less  than  five (5)  Business  Days  prior to the  filing  of the  Registration
Statement  or any related  Prospectus  or any  amendment or  supplement  thereto
(including any document that would be  incorporated or deemed to be incorporated
therein by  reference),  the  Company  shall (i) furnish to the  Holders,  their
Special  Counsel and any  managing  underwriters,  copies of all such  documents
proposed to be filed,  which documents (other than those  incorporated or deemed
to be  incorporated by reference) will be subject to the review of such Holders,
their  Special  Counsel  and such  managing  underwriters,  and (ii)  cause  its
officers and directors,  counsel and independent certified public accountants to
respond to such inquiries as shall be necessary,  in the  reasonable  opinion of
respective  counsel  to  such  Holders  and  such  underwriters,  to  conduct  a
reasonable  investigation  within the meaning of the Securities Act. The Company
shall  not  file  the  Registration  Statement  or any  such  Prospectus  or any
amendments  or  supplements  thereto to which the  Holders of a majority  of the
Registrable  Securities,  their Special Counsel,  or any



                                       5


managing  underwriters,  shall  reasonably  object in writing  within  three (3)
Business Days of their receipt thereof.

                  (b) (i) Prepare and file with the Commission such  amendments,
including  post-effective  amendments,  to the Registration  Statement as may be
necessary to keep the Registration  Statement  continuously  effective as to the
applicable  Registrable  Securities for the Effectiveness Period and prepare and
file with the Commission  such  additional  Registration  Statements in order to
register for resale under the Securities Act all of the Registrable  Securities;
(ii) cause the related  Prospectus to be amended or supplemented by any required
Prospectus supplement, and as so supplemented or amended to be filed pursuant to
Rule  424 (or any  similar  provisions  then in  force)  promulgated  under  the
Securities  Act;  (iii)  respond as  promptly  as  practicable  to any  comments
received from the Commission with respect to the  Registration  Statement or any
amendment  thereto and promptly  provide the Holders true and complete copies of
all  correspondence  from and to the  Commission  relating  to the  Registration
Statement;  and (iv) comply with the  provisions of the  Securities  Act and the
Exchange  Act with  respect to the  disposition  of all  Registrable  Securities
covered by the Registration Statement during the applicable period in accordance
with the intended methods of disposition by the Holders thereof set forth in the
Registration Statement as so amended or in such Prospectus as so supplemented.

                  (c) Notify the Holders of  Registrable  Securities to be sold,
their Special  Counsel and any managing  underwriters  immediately  (and, in the
case of (i)(A) below,  not less than five (5) days prior to such filing) and (if
requested by any such  Person)  confirm such notice in writing no later than one
(1) Business Day following  the day (i)(A) when a Prospectus  or any  Prospectus
supplement or post-effective amendment to the Registration Statement is proposed
to be filed; (B) when the Commission  notifies the Company whether there will be
a "review" of such Registration  Statement and whenever the Commission  comments
in  writing  on  such  Registration  Statement  and  (C)  with  respect  to  the
Registration Statement or any post-effective amendment, when the same has become
effective;  (ii) of any request by the  Commission or any other Federal or state
governmental  authority  for  amendments  or  supplements  to  the  Registration
Statement or Prospectus or for additional information;  (iii) of the issuance by
the  Commission  of  any  stop  order   suspending  the   effectiveness  of  the
Registration  Statement covering any or all of the Registrable Securities or the
initiation of any Proceedings  for that purpose;  (iv) if at any time any of the
representations  and  warranties  of the  Company  contained  in  any  agreement
(including any underwriting agreement) contemplated hereby ceases to be true and
correct in all  material  respects;  (v) of the  receipt  by the  Company of any
notification  with respect to the suspension of the  qualification  or exemption
from  qualification  of  any of  the  Registrable  Securities  for  sale  in any
jurisdiction,  or the  initiation  or  threatening  of any  Proceeding  for such
purpose;  and (vi) of the  occurrence of any event that makes any statement made
in the  Registration  Statement or  Prospectus or any document  incorporated  or
deemed to be incorporated therein by reference untrue in any material respect or
that requires any revisions to the Registration  Statement,  Prospectus or other
documents so that, in the case of the Registration  Statement or the Prospectus,
as the case may be, it will not contain any untrue  statement of a material fact
or omit to state




                                       6


any  material  fact  required  to be stated  therein  or  necessary  to make the
statements  therein,  in light of the circumstances  under which they were made,
not misleading.

                  (d) Use its best  efforts  to avoid the  issuance  of,  or, if
issued,  obtain the withdrawal of (i) any order suspending the  effectiveness of
the  Registration  Statement or (ii) any  suspension  of the  qualification  (or
exemption from  qualification) of any of the Registrable  Securities for sale in
any jurisdiction, at the earliest practicable moment.

                  (e) If requested by any managing underwriter or the Holders of
a majority in interest of the  Registrable  Securities  to be sold in connection
with  an  Underwritten  Offering,  (i)  promptly  incorporate  in  a  Prospectus
supplement  or  post-effective  amendment  to the  Registration  Statement  such
information  as such managing  underwriters  and such Holders  reasonably  agree
should be included therein and (ii) make all required filings of such Prospectus
supplement or such  post-effective  amendment as soon as  practicable  after the
Company has  received  notification  of the matters to be  incorporated  in such
Prospectus supplement or post-effective amendment;  provided,  however, that the
Company  shall not be required to take any action  pursuant to this Section 3(e)
that would, in the opinion of counsel for the Company, violate applicable law or
be materially detrimental to the business prospects of the Company.

                  (f)  Furnish to each  Holder,  their  Special  Counsel and any
managing  underwriters,  without  charge,  at least one  conformed  copy of each
Registration   Statement  and  each  amendment  thereto,   including   financial
statements  and  schedules,   all  documents   incorporated   or  deemed  to  be
incorporated  therein by reference,  and all exhibits to the extent requested by
such Person (including those previously  furnished or incorporated by reference)
promptly after the filing of such documents with the Commission.

                  (g) Promptly  deliver to each Holder,  their Special  Counsel,
and any  underwriters,  without  charge,  as many  copies of the  Prospectus  or
Prospectuses   (including  each  form  of  prospectus)  and  each  amendment  or
supplement  thereto as such  Persons  may  reasonably  request;  and the Company
hereby  consents to the use of such  Prospectus and each amendment or supplement
thereto by each of the selling  Holders and any  underwriters in connection with
the offering and sale of the Registrable  Securities  covered by such Prospectus
and any amendment or supplement thereto.

                  (h) Prior to any public  offering of  Registrable  Securities,
use its best  efforts  to  register  or qualify or  cooperate  with the  selling
Holders,  any  underwriters  and their Special  Counsel in  connection  with the
registration  or   qualification   (or  exemption  from  such   registration  or
qualification)  of such  Registrable  Securities  for offer  and sale  under the
securities  or Blue Sky laws of such  jurisdictions  within the United States as
any Holder or underwriter requests in writing, to keep each such registration or
qualification (or exemption therefrom) effective during the Effectiveness Period
and to do any and all other acts or things  necessary or advisable to enable the
disposition in such  jurisdictions  of the Registrable  Securities  covered by a
Registration  Statement;  provided,  however,  that  the  Company  shall  not be
required to qualify generally to do business in any jurisdiction where it is not
then so


                                       7



qualified  or to take any  action  that would  subject it to general  service of
process in any such jurisdiction  where it is not then so subject or subject the
Company to any  material  tax in any such  jurisdiction  where it is not then so
subject.

                  (i) Cooperate  with the Holders and any managing  underwriters
to facilitate the timely  preparation and delivery of certificates  representing
Registrable  Securities to be sold pursuant to a Registration  Statement,  which
certificates  shall  be free of all  restrictive  legends,  and to  enable  such
Registrable  Securities to be in such denominations and registered in such names
as any such managing  underwriters  or Holders may request at least two Business
Days prior to any sale of Registrable Securities.

                  (j) Upon the occurrence of any event  contemplated  by Section
3(c)(vi),  as  promptly  as  practicable,  prepare a  supplement  or  amendment,
including  a  post-effective  amendment,  to  the  Registration  Statement  or a
supplement to the related  Prospectus or any document  incorporated or deemed to
be incorporated  therein by reference,  and file any other required  document so
that,  as  thereafter  delivered,  neither the  Registration  Statement nor such
Prospectus will contain an untrue  statement of a material fact or omit to state
a  material  fact  required  to be  stated  therein  or  necessary  to make  the
statements  therein,  in light of the circumstances  under which they were made,
not misleading.

                  (k) Use its best efforts to cause all  Registrable  Securities
relating  to such  Registration  Statement  to be listed on the  American  Stock
Exchange  and  any  other  securities  exchange,  quotation  system,  market  or
over-the-counter  bulletin board, if any, on which similar  securities issued by
the  Company  are then  listed as and when  required  pursuant  to the  Purchase
Agreement.

                  (l) Enter  into such  agreements  (including  an  underwriting
agreement  in  form,  scope  and  substance  as  is  customary  in  Underwritten
Offerings)  and take all such other actions in connection  therewith  (including
those  reasonably  requested by any managing  underwriters  and the Holders of a
majority  of the  Registrable  Securities  being  sold) in order to  expedite or
facilitate the disposition of such Registrable Securities, and whether or not an
underwriting  agreement  is  entered  into,  (i) make such  representations  and
warranties  to such Holders and such  underwriters  as are  customarily  made by
issuers to underwriters in underwritten  public offerings,  and confirm the same
if and when requested;  (ii) in the case of an Underwritten  Offering obtain and
deliver  copies  thereof to the  managing  underwriters,  if any, of opinions of
counsel to the Company and updates thereof  addressed to each such  underwriter,
in form,  scope  and  substance  reasonably  satisfactory  to any such  managing
underwriters  covering the matters  customarily covered in opinions requested in
Underwritten  Offerings and such other matters as may be reasonably requested by
such  underwriters;   (iii)  immediately  prior  to  the  effectiveness  of  the
Registration  Statement,  and, in the case of an Underwritten  Offering,  at the
time of delivery of any Registrable Securities sold pursuant thereto, obtain and
deliver  copies to the Holders and the managing  underwriters,  if any, of "cold
comfort"  letters and updates  thereof  from the  independent  certified  public
accountants of the Company (and, if necessary,  any other independent  certified
public  accountants of any subsidiary of the Company or of any business acquired
by the Company  for which  financial



                                       8


statements  and  financial  data  is,  or is  required  to be,  included  in the
Registration  Statement),  addressed  to each  selling  Holder  and  each of the
underwriters,  if any, in form and substance as are customary in connection with
Underwritten  Offerings;  (iv) if an underwriting agreement is entered into, the
same shall contain  indemnification  provisions and procedures no less favorable
to the selling  Holders and the  underwriters,  if any,  than those set forth in
Section 6 (or such other  provisions and  procedures  acceptable to the managing
underwriters,  if any,  and  holders of a  majority  of  Registrable  Securities
participating in such Underwritten  Offering; and (v) deliver such documents and
certificates as may be reasonably  requested by the Holders of a majority of the
Registrable  Securities  being sold,  their  Special  Counsel  and any  managing
underwriters  to evidence  the  continued  validity of the  representations  and
warranties made pursuant to clause 3(l)(i) above and to evidence compliance with
any  customary  conditions  contained  in the  underwriting  agreement  or other
agreement entered into by the Company.

                  (m) Make  available for inspection by the selling  Holders,  a
representative of such Holders, an underwriter  participating in any disposition
of  Registrable  Securities,  and an  attorney  or  accountant  retained by such
selling  Holders or  underwriters,  at the offices where normally  kept,  during
reasonable business hours, all financial and other records,  pertinent corporate
documents  and  properties  of the Company and its  subsidiaries,  and cause the
officers, directors, agents and employees of the Company and its subsidiaries to
supply all  information  in each case  reasonably  requested by any such Holder,
representative,  underwriter,  attorney or  accountant  in  connection  with the
Registration  Statement;   provided,  however,  that  any  information  that  is
determined  in good faith by the  Company  in  writing  to be of a  confidential
nature at the time of delivery of such information shall be kept confidential by
such Persons,  unless (i) disclosure of such information is required by court or
administrative  order or is  necessary  to respond to  inquiries  of  regulatory
authorities;  (ii) disclosure of such information,  in the opinion of counsel to
such  Person,  is  required by law;  (iii) such  information  becomes  generally
available  to the public  other than as a result of a  disclosure  or failure to
safeguard by such Person;  or (iv) such  information  becomes  available to such
Person from a source other than the Company and such source is not known by such
Person to be bound by a confidentiality agreement with the Company.

                  (n) Comply with all  applicable  rules and  regulations of the
Commission  and  make  generally  available  to  its  security  holders  earning
statements  satisfying the provisions of Section 11(a) of the Securities Act and
Rule 158 not later than 45 days after the end of any 12-month period (or 90 days
after  the end of any  12-month  period  if such  period  is a fiscal  year) (i)
commencing at the end of any fiscal quarter in which Registrable  Securities are
sold to underwriters in a firm commitment or best efforts Underwritten  Offering
and (ii) if not sold to  underwriters  in such an  offering,  commencing  on the
first day of the first fiscal quarter of the Company after the effective date of
the Registration Statement, which statement shall cover said 12-month period, or
end shorter periods as is consistent with the requirements of Rule 158.

                  (o) The Company may require each selling  Holder to furnish to
the Company such  information  regarding the  distribution  of such  Registrable
Securities as is required by law to be disclosed in the  Registration  Statement
and the Company may exclude



                                       9


from  such  registration  the  Registrable  Securities  of any such  Holder  who
unreasonably  fails to furnish such  information  within a reasonable time after
receiving such request.

                  If the Registration  Statement refers to any Holder by name or
otherwise as the holder of any securities of the Company, then such Holder shall
have the right to require (if such reference to such Holder by name or otherwise
is not required by the  Securities  Act or any similar  Federal  statute then in
force)  the  deletion  of the  reference  to such  Holder  in any  amendment  or
supplement to the  Registration  Statement  filed or prepared  subsequent to the
time that such reference ceases to be required.

                  The  Purchaser  covenants and agrees that (i) it will not sell
any  Registrable  Securities  under  the  Registration  Statement  until  it has
received   copies  of  the  Prospectus  as  then  amended  or   supplemented  as
contemplated in Section 3(g) and notice from the Company that such  Registration
Statement and any  post-effective  amendments  thereto have become  effective as
contemplated by Section 3(c) and (ii) the Purchaser and its officers,  directors
or Affiliates,  if any, will comply with the prospectus delivery requirements of
the Securities Act as applicable to them in connection with sales of Registrable
Securities pursuant to the Registration Statement.

                  Each  Holder  agrees by its  acquisition  of such  Registrable
Securities  that, upon receipt of a notice from the Company of the occurrence of
any  event of the kind  described  in  Section  3(c)(ii),  3(c)(iii),  3(c)(iv),
3(c)(v) or 3(c)(vi),  such Holder will forthwith discontinue disposition of such
Registrable  Securities  until  such  Holder's  receipt  of  the  copies  of the
supplemented  Prospectus and/or amended Registration  Statement  contemplated by
Section  3(j),  or until it is advised in writing (the  "Advice") by the Company
that the use of the applicable  Prospectus may be resumed,  and, in either case,
has  received  copies  of  any  additional  or  supplemental  filings  that  are
incorporated  or deemed to be  incorporated  by reference in such  Prospectus or
Registration Statement.

                  If (a) there is material non-public  information regarding the
Company which the Board  reasonably  determines  not to be in the Company's best
interest  to  disclose  and which  the  Company  is not  otherwise  required  to
disclose, or (b) there is a significant business opportunity  (including but not
limited to the  acquisition or disposition of assets (other than in the ordinary
course of business) or any merger, consolidation,  tender offer or other similar
transaction)  available to the Company which the Board reasonably determines not
to be in the Company's best interest to disclose,  then the Company may postpone
or suspend filing or effectiveness of a registration  statement for a period not
to exceed 20  consecutive  days,  provided  that the Company may not postpone or
suspend its obligation under this Section for more than 60 days in the aggregate
during any 12 month period;  provided,  however,  that no such  postponement  of
suspension shall be permitted for consecutive 20 day periods, arising out of the
same set as of facts, circumstances or transactions.



                                       10



         4.       Registration Expenses

                  (a) All fees and expenses  incident to the  performance  of or
compliance with this Agreement by the Company shall, except as and to the extent
specified in Section 4(b), be borne by the Company whether or not pursuant to an
Underwritten Offering and whether or not the Registration  Statement is filed or
becomes  effective  and  whether  or not any  Registrable  Securities  are  sold
pursuant to the Registration Statement. The fees and expenses referred to in the
foregoing sentence shall include,  without limitation,  (i) all registration and
filing fees (including,  without limitation,  fees and expenses (A) with respect
to filings  required to be made with The American  Stock Exchange and each other
securities  exchange  or market on which  Registrable  Securities  are  required
hereunder to be listed and (B) in compliance  with state  securities or Blue Sky
laws (including,  without limitation,  fees and disbursements of counsel for the
Holders in connection with Blue Sky qualifications of the Registrable Securities
and  determination  of  the  eligibility  of  the  Registrable   Securities  for
investment under the laws of such jurisdictions as the managing underwriters, if
any, or the Holders of a majority of  Registrable  Securities  may  designate)),
(ii) printing  expenses  (including,  without  limitation,  expenses of printing
certificates  for  Registrable  Securities and of printing  prospectuses  if the
printing of prospectuses is requested by the managing  underwriters,  if any, or
by the  holders of a majority  of the  Registrable  Securities  included  in the
Registration Statement), (iii) messenger,  telephone and delivery expenses, (iv)
fees and  disbursements  of counsel for the Company and Special  Counsel for the
Holders,  in the case of the Special Counsel, to a maximum amount of $5,000, (v)
Securities Act liability  insurance,  if the Company so desires such  insurance,
and (vi) fees and  expenses  of all other  Persons  retained  by the  Company in
connection  with  the  consummation  of the  transactions  contemplated  by this
Agreement. In addition, the Company shall be responsible for all of its internal
expenses  incurred  in  connection  with the  consummation  of the  transactions
contemplated by this Agreement (including,  without limitation, all salaries and
expenses of its officers and employees  performing legal or accounting  duties),
the expense of any annual  audit,  the fees and expenses  incurred in connection
with the listing of the  Registrable  Securities on any  securities  exchange as
required hereunder.

                  (b) If the Holders require an Underwritten  Offering  pursuant
to the terms hereof,  the Company shall be responsible  for all costs,  fees and
expenses in connection  therewith,  except for the fees and disbursements of the
Underwriters  (including any  underwriting  commissions and discounts) and their
legal counsel and accountants (which shall be borne by the Holders).  Therefore,
in such  circumstances  the  Holder  shall  bear  the  expenses  of the fees and
disbursements   of  any  legal  counsel  or  accounting  firm  retained  by  the
underwriters in connection with such Underwritten  Offering and the costs of any
determination  (but not filing) by the  underwriters  of the  eligibility of the
Registrable  Securities for investment  under the  applicable  state  securities
laws.  By way of  illustration  which  is not  intended  to  diminish  from  the
provisions of Section 4(a),  the Holders shall not be  responsible  for, and the
Company  shall be  required  to pay the fees or  disbursements  incurred  by the
Company (including by its legal counsel and accountants) in connection with, the
preparation  and filing of a Registration  Statement and related  Prospectus for
such offering, the maintenance of such Registration Statement in accordance with
the terms hereof,  the listing of



                                       11


the  Registrable  Securities in accordance  with the  requirements  hereof,  and
printing expenses incurred to comply with the requirements hereof.

         5.       Indemnification

                  (a)  Indemnification  by  the  Company.   The  Company  shall,
notwithstanding  any termination of this Agreement,  indemnify and hold harmless
each  Holder,  the  officers,  directors,  agents  (including  any  underwriters
retained by such  Holder in  connection  with the offer and sale of  Registrable
Securities),   brokers   (including  brokers  who  offer  and  sell  Registrable
Securities  as principal as a result of a pledge or any failure to perform under
a margin call of Common  Stock),  investment  advisors and  employees of each of
them, each Person who controls any such Holder (within the meaning of Section 15
of the  Securities  Act or Section  20 of the  Exchange  Act) and the  officers,
directors,  agents and employees of each such controlling Person, to the fullest
extent permitted by applicable law, from and against any and all losses, claims,
damages, liabilities, costs (including, without limitation, costs of preparation
and attorneys' fees) and expenses (collectively, "Losses"), as incurred, arising
out of or relating to any untrue or alleged untrue  statement of a material fact
contained  in  the  Registration  Statement,  any  Prospectus  or  any  form  of
prospectus  or in any  amendment  or  supplement  thereto or in any  preliminary
prospectus, or arising out of or relating to any omission or alleged omission of
a  material  fact  required  to be  stated  therein  or  necessary  to make  the
statements  therein  (in the case of any  Prospectus  or form of  prospectus  or
supplement  thereto,  in light of the circumstances  under which they were made)
not misleading,  except to the extent, but only to the extent,  that such untrue
statements or omissions are based solely upon information  regarding such Holder
furnished in writing to the Company by or on behalf of such Holder expressly for
use therein,  or to the extent that such  information  relates to such Holder or
such Holder's proposed method of distribution of Registrable  Securities and was
reviewed and expressly  approved in writing by such Holder  expressly for use in
the Registration Statement, such Prospectus or such form of Prospectus or in any
amendment or supplement  thereto.  The Company shall notify the Holders promptly
of the  institution,  threat or assertion of any Proceeding of which the Company
is aware in connection with the transactions contemplated by this Agreement.

                  (b) Indemnification by Holders.  Each Holder shall,  severally
and not  jointly,  indemnify  and hold  harmless  the  Company,  the  directors,
officers, agents and employees, each Person who controls the Company (within the
meaning of Section 15 of the Securities Act and Section 20 of the Exchange Act),
and the directors, officers, agents or employees of such controlling Persons, to
the fullest extent  permitted by applicable law, from and against all Losses (as
determined by a court of competent  jurisdiction in a final judgment not subject
to appeal or  review)  arising  solely  out of or based  solely  upon any untrue
statement  of a material  fact  contained  in the  Registration  Statement,  any
Prospectus,  or any form of prospectus, or arising solely out of or based solely
upon any omission of a material fact required to be stated  therein or necessary
to make the  statements  therein not  misleading to the extent,  but only to the
extent,  that such untrue  statement or omission is contained in any information
so furnished in writing by such Holder to the Company specifically for inclusion
in the  Registration  Statement  or such  Prospectus  or to the extent that such
information  relates



                                       12


to such Holder or such Holder's  proposed  method of distribution of Registrable
Securities  and was  reviewed and  expressly  approved in writing by such Holder
expressly for use in the Registration Statement, such Prospectus or such form of
Prospectus.  In no event shall the liability of any selling Holder  hereunder be
greater in amount than the dollar  amount of the net  proceeds  received by such
Holder  upon  the  sale  of the  Registrable  Securities  giving  rise  to  such
indemnification obligation.

                  (c) Conduct of Indemnification  Proceedings. If any Proceeding
shall be brought or asserted against any Person entitled to indemnity  hereunder
(an  "Indemnified  Party"),  such  Indemnified  Party  promptly shall notify the
Person from whom indemnity is sought (the "Indemnifying  Party") in writing, and
the  Indemnifying  Party  shall  assume  the  defense  thereof,   including  the
employment of counsel  reasonably  satisfactory to the Indemnified Party and the
payment of all fees and expenses  incurred in connection  with defense  thereof;
provided,  that the failure of any  Indemnified  Party to give such notice shall
not relieve the Indemnifying Party of its obligations or liabilities pursuant to
this  Agreement,  except  (and  only) to the  extent  that it  shall be  finally
determined  by a court of competent  jurisdiction  (which  determination  is not
subject to appeal or further  review) that such failure  shall have  proximately
and materially adversely prejudiced the Indemnifying Party.

                  An Indemnified  Party shall have the right to employ  separate
counsel in any such  Proceeding and to participate in the defense  thereof,  but
the  fees  and  expenses  of  such  counsel  shall  be at the  expense  of  such
Indemnified  Party or Parties unless:  (1) the Indemnifying  Party has agreed in
writing to pay such fees and expenses;  or (2) the Indemnifying Party shall have
failed  promptly to assume the defense of such  Proceeding and to employ counsel
reasonably satisfactory to such Indemnified Party in any such Proceeding; or (3)
the named  parties to any such  Proceeding  (including  any  impleaded  parties)
include  both  such  Indemnified  Party  and the  Indemnifying  Party,  and such
Indemnified Party shall have been advised by counsel that a conflict of interest
is likely to exist if the same counsel were to represent such Indemnified  Party
and the Indemnifying  Party (in which case, if such  Indemnified  Party notifies
the  Indemnifying  Party in writing that it elects to employ separate counsel at
the expense of the Indemnifying Party, the Indemnifying Party shall not have the
right to assume the defense  thereof and such counsel shall be at the expense of
the  Indemnifying  Party).  The  Indemnifying  Party shall not be liable for any
settlement of any such Proceeding  effected without its written  consent,  which
consent shall not be unreasonably withheld. No Indemnifying Party shall, without
the prior written consent of the Indemnified Party, effect any settlement of any
pending Proceeding in respect of which any Indemnified Party is a party,  unless
such settlement includes an unconditional release of such Indemnified Party from
all liability on claims that are the subject matter of such Proceeding.

                  All fees and  expenses  of the  Indemnified  Party  (including
reasonable  fees  and  expenses  to  the  extent  incurred  in  connection  with
investigating   or  preparing  to  defend  such   Proceeding  in  a  manner  not
inconsistent  with this  Section)  shall be paid to the  Indemnified  Party,  as
incurred,  within 10 Business Days of written notice thereof to the Indemnifying
Party  (regardless  of whether it is ultimately  determined  that an Indemnified
Party  is  not  entitled  to  indemnification  hereunder;   provided,  that  the
Indemnifying  Party may require such



                                       13


Indemnified  Party to undertake  to reimburse  all such fees and expenses to the
extent it is finally  judicially  determined that such Indemnified  Party is not
entitled to indemnification hereunder).

                  (d) Contribution. If a claim for indemnification under Section
5(a) or 5(b) is  unavailable  to an  Indemnified  Party  because of a failure or
refusal  of  a  governmental   authority  to  enforce  such  indemnification  in
accordance  with its terms (by reason of public policy or otherwise),  then each
Indemnifying  Party,  in lieu of  indemnifying  such  Indemnified  Party,  shall
contribute to the amount paid or payable by such  Indemnified  Party as a result
of such Losses,  in such  proportion as is  appropriate  to reflect the relative
fault of the  Indemnifying  Party and  Indemnified  Party in connection with the
actions,  statements  or omissions  that  resulted in such Losses as well as any
other relevant equitable considerations. The relative fault of such Indemnifying
Party and  Indemnified  Party shall be  determined  by reference to, among other
things,  whether any action in question,  including any untrue or alleged untrue
statement of a material fact or omission or alleged omission of a material fact,
has been  taken  or made  by,  or  relates  to  information  supplied  by,  such
Indemnifying  Party or  Indemnified  Party,  and the parties'  relative  intent,
knowledge,  access to  information  and  opportunity  to correct or prevent such
action, statement or omission. The amount paid or payable by a party as a result
of any Losses shall be deemed to include,  subject to the  limitations set forth
in Section 5(c), any reasonable  attorneys' or other reasonable fees or expenses
incurred  by such party in  connection  with any  Proceeding  to the extent such
party   would  have  been   indemnified   for  such  fees  or  expenses  if  the
indemnification  provided  for in this  Section was  available  to such party in
accordance with its terms.

                  The  parties  hereto  agree  that it  would  not be  just  and
equitable if  contribution  pursuant to this Section 5(d) were determined by pro
rata  allocation  or by any other method of  allocation  that does not take into
account the equitable  considerations  referred to in the immediately  preceding
paragraph.  Notwithstanding  the  provisions of this Section 5(d), the Purchaser
shall not be required to contribute,  in the aggregate,  any amount in excess of
the amount by which the proceeds  actually  received by the  Purchaser  from the
sale of the Registrable  Securities subject to the Proceeding exceeds the amount
of any damages that the Purchaser  has otherwise  been required to pay by reason
of such untrue or alleged untrue statement or omission or alleged  omission.  No
Person  guilty of  fraudulent  misrepresentation  (within the meaning of Section
11(f) of the Securities Act) shall be entitled to  contribution  from any Person
who was not guilty of such fraudulent misrepresentation.

                  The indemnity and  contribution  agreements  contained in this
Section are in addition to any liability that the Indemnifying  Parties may have
to the Indemnified Parties.

         6.       Rule 144

                  The Company shall file the reports  required to be filed by it
under the  Securities Act and the Exchange Act in a timely manner and, if at any
time the  Company is not  required  to file such  reports,  they will,  upon the
request of any Holder,  make publicly  available  other  information  so long as
necessary  to permit sales of its  securities  pursuant to Rule 144. The



                                       14


Company  further  covenants  that it will take such further action as any Holder
may reasonably  request,  all to the extent required from time to time to enable
such  Holder  to sell  Registrable  Securities  without  registration  under the
Securities  Act within the  limitation of the  exemptions  provided by Rule 144;
provided, however, that the Company shall not be obligated to provide an opinion
to  any  Holder  regarding  the  sale  of  Registrable  Securities  pursuant  to
exemptions  provided by Rule 144.  Upon the  request of any Holder,  the Company
shall  deliver  to such  Holder a  written  certification  of a duly  authorized
officer as to whether it has complied with such requirements.

         7.       Miscellaneous

                  (a) Remedies.  In the event of a breach by the Company or by a
Holder,  of any of their  obligations  under this Agreement,  each Holder or the
Company,  as the case may be, in  addition to being  entitled  to  exercise  all
rights granted by law and under this Agreement,  including  recovery of damages,
will be entitled to specific performance of its rights under this Agreement. The
Company and each Holder agree that monetary  damages would not provide  adequate
compensation  for any losses  incurred by reason of a breach by it of any of the
provisions of this Agreement and hereby further agrees that, in the event of any
action for specific  performance  in respect of such breach,  it shall waive the
defense that a remedy at law would be adequate.

                  (b) No Inconsistent Agreements. Neither the Company nor any of
its subsidiaries has, as of the date hereof, nor shall the Company or any of its
subsidiaries,  on or after the date of this Agreement,  enter into any agreement
with respect to its securities that is  inconsistent  with the rights granted to
the Holders in this Agreement or otherwise conflicts with the provisions hereof.
Neither the Company nor any of its subsidiaries has previously  entered into any
agreement granting any registration rights with respect to any of its securities
to any Person.  Without  limiting the generality of the  foregoing,  without the
written consent of the Holders of a majority of the then outstanding Registrable
Securities,  the Company  shall not grant to any Person the right to request the
Company to register  any  securities  of the Company  under the  Securities  Act
unless the rights so granted are subject in all  respects to the prior rights in
full of the  Holders  set forth  herein,  and are not  otherwise  in conflict or
inconsistent with the provisions of this Agreement.

                  (c) No Piggyback on Registrations. Neither the Company nor any
of its  security  holders  (other  than the  Holders in such  capacity  pursuant
hereto) may include  securities  of the  Company in the  Registration  Statement
other than the Registrable Securities,  and the Company shall not enter into any
agreement providing any such right to any of its securityholders.

                  (d) Piggy-Back Registrations. If at any time when there is not
an effective  Registration  Statement the Company shall determine to prepare and
file with the  Commission a registration  statement  relating to an offering for
its own account or the account of others under the  Securities Act of any of its
equity securities, other than on Form S-4 or Form S-8 (each as promulgated under
the Securities Act) or their then equivalents  relating to equity  securities to



                                       15



be issued solely in connection with any acquisition of any entity or business or
equity  securities  issuable in connection  with stock option or other  employee
benefit plans,  the Company shall send to each holder of Registrable  Securities
written  notice of such  determination  and,  if within  twenty  (20) days after
receipt of such notice, any such holder shall so request in writing, the Company
shall include in such registration  statement all or any part of the Registrable
Securities  such holder  requests to be registered.  No right to registration of
Registrable  Securities  under  this  Section  shall be  construed  to limit any
registration otherwise required hereunder.

                  (e) Amendments and Waivers.  The provisions of this Agreement,
including  the  provisions  of this  sentence,  may not be amended,  modified or
supplemented,  and waivers or consents to departures from the provisions  hereof
may not be given,  unless the same shall be in writing and signed by the Company
and the  Holders  of at least a  majority  of the then  outstanding  Registrable
Securities;  provided,  however,  that,  for  the  purposes  of  this  sentence,
Registrable  Securities that are owned, directly or indirectly,  by the Company,
or an Affiliate of the Company are not deemed  outstanding.  Notwithstanding the
foregoing, a waiver or consent to depart from the provisions hereof with respect
to a matter that relates  exclusively to the rights of Holders and that does not
directly  or  indirectly  affect  the  rights of other  Holders  may be given by
Holders  of at least a  majority  of the  Registrable  Securities  to which such
waiver or  consent  relates;  provided,  however,  that the  provisions  of this
sentence may not be amended, modified, or supplemented except in accordance with
the provisions of the immediately preceding sentence.

                  (f) Notices.  Any and all notices or other  communications  or
deliveries  required or permitted to be provided  hereunder  shall be in writing
and  shall be deemed  given and  effective  on the  earliest  of (i) the date of
transmission,  if such notice or communication is delivered via facsimile at the
facsimile  telephone  number  specified in this Section  prior to 4:30 p.m. (New
York City  time) on a  Business  Day,  (ii) the  Business  Day after the date of
transmission,  if such notice or communication is delivered via facsimile at the
facsimile  telephone number specified in the Purchase  Agreement later than 4:30
p.m. (New York City time) on any date and earlier than 11:59 p.m. (New York City
time) on such date,  (iii) the Business Day  following  the date of mailing,  if
sent by nationally  recognized  overnight  courier service,  or (iv) upon actual
receipt by the party to whom such notice is required to be given.

         If to the Company:         PLC Systems Inc.
                                    10 Forge Park
                                    Franklin, MA  02038
                                    Attn:  Chief Executive Officer
                                    Facsimile No.:  (508) 541-7990



                                       16



         With copies to:            Mintz, Levin, Cohn, Ferris, Glovsky
                                      and Popeo, P.C.
                                    One Financial Center
                                    Boston, MA  02111
                                    Attn:  Neil H. Aronson
                                    Facsimile No.:  (617) 542-2241

         If to the Southbrook:      Southbrook International
                                      Investments, Ltd.
                                    c/o Trippoak Advisors, Inc.
                                    630 Fifth Avenue, Suite 2000
                                    New York, NY  10111
                                    Facsimile No.:  (212) 332-3256
                                    Attn:  Robert L. Miller

         If to HBK Cayman:          HBK Cayman L.P.
                                    c/o HBK Investments L.P.
                                    777 Main Street, Suite 2750
                                    Forth Worth, TX  76102
                                    Facsimile No.:  (817) 870-6234
                                    Attn:  David C. Haley and Michael Reese

         If to HBK Offshore:        HBK Offshore Fund Ltd.
                                    c/o HBK Investments L.P.
                                    777 Main Street, Suite 2750
                                    Forth Worth, TX  76102
                                    Facsimile No.:  (817) 870-6234
                                    Attn:  David C. Haley and Michael Reese

         With copies in the case of
         Southbrook, HBK Cayman, and
         HBK Offshore to:           Robinson Silverman Pearce
                                      Aronsohn & Berman LLP
                                    1290 Avenue of the Americas
                                    New York, NY  10104
                                    Attn:  Eric L. Cohen
                                    Fax:  (212) 541-4630

         If to any other Person who is then the registered Holder:

                                    To the address of such Holder as it appears
                                    in the stock transfer books of the Company

or such other  address as may be designated  in writing  hereafter,  in the same
manner, by such Person.



                                       17


                  (g) Successors and Assigns.  This Agreement shall inure to the
benefit of and be binding upon the successors  and permitted  assigns of each of
the parties and shall inure to the benefit of each  Holder.  The Company may not
assign its rights or obligations  hereunder without the prior written consent of
each Holder.  The Purchaser may assign its rights hereunder in the manner and to
the Persons as permitted under the Purchase Agreement.

                  (h)  Assignment  of  Registration  Rights.  The  rights of the
Purchaser hereunder, including the right to have the Company register for resale
Registrable Securities in accordance with the terms of this Agreement,  shall be
automatically  assignable by the Purchasers to any assignee or transferee of all
or a portion of the Debentures,  the Warrants or the Registrable  Securities if:
(i) the  Purchaser  agrees in writing with the  transferee or assignee to assign
such rights,  and a copy of such  agreement is furnished to the Company within a
reasonable time after such assignment,  (ii) the Company is, within a reasonable
time after such transfer or assignment, furnished with written notice of (a) the
name and address of such  transferee or assignee,  and (b) the  securities  with
respect to such  registration  rights are being  transferred or assigned,  (iii)
following such transfer or assignment the further disposition of such securities
by  the  transferee  or  assignees  restricted  under  the  Securities  Act  and
applicable  state  securities  laws,  (iv) at or  before  the time  the  Company
receives the written  notice  contemplated  by clause (ii) of this Section,  the
transferee or assignee  agrees in writing with the Company to be bound by all of
the provisions of this Agreement,  and (v) such transfer shall have been made in
accordance  with the  applicable  requirements  of the Purchase  Agreement.  The
rights  to  assignment  shall  apply  to the  Purchaser's  (and  to  subsequent)
successors and assigns.

                  (i) Counterparts. This Agreement may be executed in any number
of  counterparts,  each of  which  when so  executed  shall be  deemed  to be an
original  and, all of which taken  together  shall  constitute  one and the same
Agreement.   In  the  event  that  any   signature  is  delivered  by  facsimile
transmission,  such  signature  shall create a valid  binding  obligation of the
party  executing  (or on whose behalf such  signature is executed) the same with
the same  force and  effect as if such  facsimile  signature  were the  original
thereof.

                  (j)  Governing  Law. This  Agreement  shall be governed by and
construed in accordance  with the laws of the State of New York,  without regard
to principles of conflicts of law.

                  (k)  Cumulative  Remedies.  The remedies  provided  herein are
cumulative and not exclusive of any remedies provided by law.

                  (l)  Severability.   If  any  term,  provision,   covenant  or
restriction of this Agreement is held by a court of competent jurisdiction to be
invalid, illegal, void or unenforceable, the remainder of the terms, provisions,
covenants  and  restrictions  set forth  herein  shall  remain in full force and
effect and shall in no way be affected, impaired or invalidated, and the parties
hereto  shall use their  reasonable  efforts to find and  employ an  alternative
means to achieve the same or substantially  the same result as that contemplated
by



                                       18


such term,  provision,  covenant or  restriction.  It is hereby  stipulated  and
declared to be the  intention of the parties  that they would have  executed the
remaining terms, provisions, covenants and restrictions without including any of
such that may be hereafter declared invalid, illegal, void or unenforceable.

                  (m)  Headings.   The  headings  in  this   Agreement  are  for
convenience  of  reference  only and  shall not limit or  otherwise  affect  the
meaning hereof.

                  (n) Shares Held by The Company  and its  Affiliates.  Whenever
the  consent or approval of Holders of a  specified  percentage  of  Registrable
Securities is required hereunder,  Registrable Securities held by the Company or
its Affiliates (other than the Purchaser or transferees or successors or assigns
thereof if such  Persons are deemed to be  Affiliates  solely by reason of their
holdings of such  Registrable  Securities)  shall not be counted in  determining
whether  such  consent or  approval  was given by the  Holders of such  required
percentage.


                   [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK
                            SIGNATURE PAGE TO FOLLOW]




                                       19




         IN WITNESS WHEREOF,  the parties have executed this Agreement as of the
date first written above.

                                    PLC SYSTEMS INC.



                                    By:________________________
                                        Name:
                                        Title:


                   SOUTHBROOK INTERNATIONAL INVESTMENTS, LTD.



                                    By:________________________
                                        Name:
                                        Title:


                                    HBK CAYMAN L.P.



                                    By:________________________
                                        Name:
                                        Title:


                                    HBK OFFSHORE FUND LTD.



                                    By:________________________
                                        Name:
                                        Title:


                                       20


                                                                      EXHIBIT 11





                                PLC SYSTEMS INC.
                   CALCULATION OF NET INCOME (LOSS) PER SHARE
                      (In thousands, except per share data)


<TABLE>
<CAPTION>

                                  Three Months Ended      Six Months Ended
                                       June 30,               June 30,
                                  ------------------      ----------------
                                   1997       1996         1997      1996
                                  ------     ------       ------    ------

<S>                              <C>         <C>         <C>         <C>   
Weighted average number of
 common shares outstanding       16,632      16,441      16,021      16,246

Common stock equivalents (1)       --          --          --           968
                               --------    --------    --------    --------

 Shares used to compute net
 income (loss) per share         16,632      16,441      16,021      17,214

 Net income (loss)             $ (2,697)   $   (903)   $ (5,719)   $    374


 Net income (loss) per share   $  (0.16)   $  (0.05)   $  (0.36)   $   0.02

</TABLE>


(1)  The net loss per share is calculated  using the weighted  average number of
     shares  outstanding  during the period and does not  include  common  stock
     equivalents as their inclusion would be antidilutive.





<TABLE> <S> <C>


     <ARTICLE>5
       
  <S><C>
<PERIOD-TYPE>             3-MOS
<FISCAL-YEAR-END>                       DEC-31-1996
<PERIOD-END>                            JUN-30-1997  
<CASH>                                    1,680,000
<SECURITIES>                                      0
<RECEIVABLES>                             3,862,000
<ALLOWANCES>                                (76,000)
<INVENTORY>                               3,052,000
<CURRENT-ASSETS>                          9,107,000
<PP&E>                                    8,333,000
<DEPRECIATION>                           (3,180,000)
<TOTAL-ASSETS>                           14,931,000
<CURRENT-LIABILITIES>                     3,717,000
<BONDS>                                           0
                             0
                                       0
<COMMON>                                 54,639,000
<OTHER-SE>                              (43,446,000)              
<TOTAL-LIABILITY-AND-EQUITY>             14,931,000
<SALES>                                   2,525,000
<TOTAL-REVENUES>                          3,422,000
<CGS>                                     1,470,000
<TOTAL-COSTS>                             4,664,000
<OTHER-EXPENSES>                            (27,000)
<LOSS-PROVISION>                                  0
<INTEREST-EXPENSE>                          (42,000)
<INCOME-PRETAX>                          (2,697,000)
<INCOME-TAX>                                      0
<INCOME-CONTINUING>                      (2,697,000)
<DISCONTINUED>                                    0
<EXTRAORDINARY>                                   0
<CHANGES>                                         0
<NET-INCOME>                             (2,697,000)
<EPS-PRIMARY>                                  (.16)
<EPS-DILUTED>                                  (.16)
                            


</TABLE>


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