CYBERONICS INC
SC 13D, 1997-04-07
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D
                    Under the Securities Exchange Act of 1934

                                CYBERONICS, INC.
                                ----------------
                                (Name of Issuer)

                          COMMON STOCK, $.01 PAR VALUE
                          ----------------------------
                         (Title of Class of Securities)

                                   23251P 10 2
                                 (CUSIP Number)

                                 Kevin S. Moore
                Senior Vice President and Chief Financial Officer
                             The Clark Estates, Inc.
                                 30 Wall Street
                            New York, New York 10005
                                 (212) 269-1833

                                 With a copy to:

                             David W. Ambrosia, Esq.
                       Winthrop, Stimson, Putnam & Roberts
                             One Battery Park Plaza
                          New York, New York 10004-1490
                                 (212) 858-1208
- --------------------------------------------------------------------------------
            (Name, Address and Telephone Number of Person Authorized
                     to Receive Notices and Communications)

                                 March 28, 1997
                                 --------------
                          (Date of Event which Requires
                            Filing of this Statement)

If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
Schedule because of Rule 13d- 1(b)(3) or (4), check the following [ ].



<PAGE>



CUSIP No. 23251P 10 2
- --------------------------------------------------------------------------------
         1)       Names of Reporting Persons
                  S.S. or I.R.S. Identification Nos. of Above Persons
                           The Clark Estates, Inc.
                           13-5524538
- --------------------------------------------------------------------------------
         2)       Check the Appropriate Box if a Member of a Group (See 
                  Instructions)
                           (a) |_|
                           (b) |X|
- --------------------------------------------------------------------------------
         3)       SEC Use Only
- --------------------------------------------------------------------------------
         4)       Source of Funds (See Instructions)
                           OO
- --------------------------------------------------------------------------------
         5)       Check if Disclosure of Legal Proceedings is
                  Required Pursuant to Items 2(d) or 2(e)
                           |_|
- --------------------------------------------------------------------------------
         6)       Citizenship or Place of Organization
                           New York
- --------------------------------------------------------------------------------
Number of Shares                    7)      Sole Voting Power
                                                1,226,208
                                     -------------------------------------------
Beneficially                        8)       Shared Voting Power
                                                0
                                     -------------------------------------------
Owned by Each                       9)      Sole Dispositive Power
                                                1,226,208
                                     -------------------------------------------
Reporting Person With               10)     Shared Dispositive Power
                                                0
- --------------------------------------------------------------------------------
         11)      Aggregate Amount Beneficially Owned by Each Reporting Person
                           1,226,208
- --------------------------------------------------------------------------------
         12)      Check if the Aggregate Amount in Row 11) Excludes Certain 
                  Shares (See Instructions)
                           |_|
- --------------------------------------------------------------------------------
         13)      Percent of Class Represented by Amount in Row 11)
                  9.2%
- --------------------------------------------------------------------------------
         14)      Type of Reporting Person  (See Instructions)
                           CO


                                       -2-

<PAGE>



                  The  summary  descriptions  contained  in  this  statement  of
certain agreements and documents are qualified in their entirety by reference to
the complete texts of such  agreements and documents  filed as Exhibits  hereto,
which agreements and documents are hereby incorporated herein by reference.


Item 1.  Security and Issuer

                  This statement relates to the Common Stock, $.01 par value per
share (the "Common  Stock"),  of Cyberonics,  Inc., a Delaware  corporation (the
"Company").  The principal executive offices of the Company are located at 17448
Highway 3, Suite 100, Webster, Texas 77598.


Item 2.  Identity and Background

                  (a) - (c)  This statement is being filed by The Clark Estates,
 Inc. ("Reporting Person").

                  The  Reporting  Person is a New York  corporation  principally
engaged  in the  business  of  providing  administrative  services  relating  to
investments of certain institutional,  corporate,  individual and trust accounts
affiliated with the Clark family.  The principal  business and principal  office
address of the Reporting Person is 30 Wall Street, New York, New York 10005.

                  The name,  business address,  present principal  occupation or
employment of each executive  officer and director of the Reporting  Person (the
"Executive Officers and Directors") are set forth in Schedule I hereto, which is
incorporated herein by reference.

                  (d) - (e) During the last five years,  neither  the  Reporting
Person nor, to the best knowledge of the Reporting Person,  any of the Executive
Officers  and  Directors  has  (A)  been  convicted  in  a  criminal  proceeding
(excluding traffic violations or similar  misdemeanors) or (B) been a party to a
civil proceeding of a judicial or administrative body of competent  jurisdiction
and as a result of such  proceeding  was or is subject to a judgment,  decree or
final  order  enjoining  future  violations  of,  or  prohibiting  or  mandating
activities subject to, federal or state securities laws or finding any violation
with respect to such laws.

                  (f) Each of the  persons  listed in this Item 2 or  Schedule I
hereto is a citizen of the United States of America.


Item 3.  Source and Amount of Funds or Other Consideration

                  On  March  28,  1997,   twenty-four  accounts  for  which  the
Reporting   Person  provides   management  and   administrative   services  (the
"Purchasers"), the Company and certain  other  purchasers  entered  into a Stock
Purchase  Agreement (the "Stock Purchase  Agreement") and a Registration  Rights



                                       -3-

<PAGE>



Agreement (the  "Registration  Rights  Agreement")  whereby the Purchasers  used
personal funds to purchase from the Company in a private  placement an aggregate
of  901,408  shares of  Common  Stock at a price of  $4.4375  per  share,  or an
aggregate  purchase  price of  $3,999,998.  Combined with previous  purchases of
Common Stock made during the Company's  initial public  offering and on the open
market  thereafter,  this  purchase  brought  the  Reporting  Person's  indirect
beneficial  ownership of Common Stock above 5% of such class.  The form of Stock
Purchase  Agreement and the form of Registration  Rights  Agreement are attached
hereto as Exhibits A and B, respectively.


Item 4.  Purpose of Transaction

                  The  shares  of  Common  Stock  purchased  through  the  Stock
Purchase Agreement were acquired for investment  purposes.  The Reporting Person
does not have any  intention  of acquiring  control  over the Company;  however,
depending upon market and other conditions, the Reporting Person or the accounts
for which it provides  administrative  services may acquire additional shares of
Common Stock for investment  purposes if such shares become  available at prices
that are attractive,  or may dispose of all or a portion of the shares currently
owned or hereinafter acquired. In addition, pursuant to a letter agreement dated
March  28,  1997  (the  "Letter  Agreement"),  the  Company  agreed to allow the
Reporting Person to designate one person reasonably acceptable to the Company to
serve on the  Company's  Board of Directors,  which right shall  continue for so
long as accounts for which the Reporting Person provides administrative services
continue  to own an  aggregate  of at  least  600,000  shares  of  Common  Stock
purchased through the Stock Purchase Agreement. The Letter Agreement is attached
hereto as Exhibit C.

                  Except as disclosed  above, the Reporting Person does not have
any plans or  proposals of the type set forth in  Paragraphs  (a) through (j) of
Item 4 of Schedule 13D.


Item 5.  Interest in Securities of the Issuer

                  (a) As of the  close  of  business  on  March  28,  1997,  the
Reporting   Person   beneficially   owns  1,226,208   shares  of  Common  Stock,
constituting approximately 9.2% of the outstanding shares of Common Stock.

                  (b) The  Reporting  Person has sole power to vote or to direct
the vote of the shares of Common Stock  referred to in  paragraph  (a) above and
sole power to dispose or to direct the disposition of any of such shares.

                  (c)  Except as  described  in Item 3,  neither  the  Reporting
Person nor, to the best knowledge of the Reporting Person,  any of the Executive
Officers and Directors,  has effected any transactions in shares of Common Stock
during the past 60 days.

                  (d)      Not applicable.

                  (e)      Not applicable.



                                       -4-

<PAGE>




Item 6.  Contracts, Arrangements, Understandings or Relationships With Respect 
         to Securities of the Issuer

                  Except  for  the  Stock Purchase  Agreement, the  Registration
Rights Agreement and the Letter Agreement, neither the Reporting Person, nor (to
the best  knowledge of the Reporting  Person) any of the Executive  Officers and
Directors, has any contract,  arrangement,  understanding or relationship (legal
or  otherwise)  with any person with respect to any  securities  of the Company,
including  but not limited to the transfer or voting of any of such  securities,
finder's  fees,  joint  ventures,  loan or option  arrangements,  puts or calls,
guarantees  of  profits,  division  of  profits  or  loss or the  giving  or the
withholding of proxies.

                  In the  Stock  Purchase  Agreement,  each  of  the  Purchasers
covenanted not to sell any shares of Common Stock purchased  thereby unless such
transaction  (i) is registered  under the Securities  Act of 1933,  (ii) is made
pursuant to Rule 144 under the  Securities  Act of 1933 or (iii) is made subject
to such  conditions  as the Company shall  impose,  in  accordance  with another
exemption  from the  registration  requirements  of the  Securities Act of 1933.
Notwithstanding  the foregoing,  the Registration Rights Agreement provides that
any Holder of Registrable  Securities may transfer the whole or any part thereof
and all rights  provided  under the  Registration  Rights  Agreement  to certain
affiliated Persons and entities, provided that certain conditions are met.

                  Pursuant to the Registration Rights Agreement, the Company has
granted to the Shareholders  listed on Exhibit A thereto certain "Requested" and
"Piggyback"  registration  rights  with  respect to the  shares of Common  Stock
purchased  through  the  Stock  Purchase  Agreement.   The  Registration  Rights
Agreement also contains  certain holdback  provisions  applicable in the case of
certain registered offerings by the Company.


Item 7.  Material to be Filed as Exhibits

     Exhibit A      Form of Common  Stock  Purchase  Agreement,  dated March 28,
                    1997, between Cyberonics,  Inc. and the purchasers listed on
                    Exhibit A thereto.

     Exhibit  B     Form of Registration Rights Agreement, dated March 28, 1997,
                    by and among Cyberonics, Inc. and the stockholders listed on
                    Exhibit A thereto.

     Exhibit C      Letter  Agreement,  dated March 28, 1997,  from  Cyberonics,
                    Inc. to The Clark Estates, Inc.



                                       -5-

<PAGE>



                  After  reasonable  inquiry and to the best of my knowledge and
belief,  I certify  that the  information  set forth in this  statement is true,
complete and correct.


April 7, 1997
- -----------------------------
Date



/s/ Kevin S. Moore
- -----------------------------
Signature



Kevin S. Moore
Senior Vice President and Chief
  Financial Officer
The Clark Estates, Inc.
- -----------------------------
Name/Title



                                       -6-

<PAGE>





                                   SCHEDULE I

                       Executive Officers and Directors of
                             The Clark Estates, Inc.

         Except where otherwise  indicated,  the business address of each of the
following is The Clark Estates, Inc., 30 Wall Street, New York, New York 10005.

                              Principal Occupation
Name                          and Name of Business
- ----                          --------------------


Edward W. Stack               President and Director
                              The Clark Estates, Inc.
                              Management Services

Jane F. Clark                 Chairman and Director
                              The Clark Estates, Inc.
                              Management Services

Kevin S. Moore                Senior Vice President, Chief
                              Financial Officer and Director
                              The Clark Estates, Inc.
                              Management Services

William T. Burdick            Secretary
                              The Clark Estates, Inc.
                              Management Services

Anne L. Peretz                Director
                              The Clark Estates, Inc.
                              Management Services

Marshall F. Wallach           Director
                              The Clark Estates, Inc.
                              Management Services




<PAGE>
                                                                      EXHIBIT A

                                CYBERONICS, INC.

                            STOCK PURCHASE AGREEMENT


         This Stock Purchase  Agreement is made  as of March 28,  1997,  between
Cyberonics, Inc., a Delaware corporation (the "Company"), and the purchasers who
are signatories hereto and listed on Exhibit A hereto (the "Purchasers").

         WHEREAS,  the  Company  wishes  to sell and the  Purchasers  desire  to
purchase shares of the Company's Common Stock;

         NOW, THEREFORE, the parties hereto hereby agree as follows:

         1.        Sale  and  Purchase  of  Shares.  Subject  to the  terms  and
conditions hereof,  the Company will issue and sell to the Purchasers,  and each
Purchaser  will purchase from the Company,  the number of shares of Common Stock
set opposite such  Purchaser's name on the signature page hereto at the price of
$4.4375 per share. The obligations of each Purchaser  hereunder are separate and
not joint and no  Purchaser  shall be obligated to purchase any number of shares
in excess of the number set opposite its name.  The total amount of Common Stock
sold to the Purchasers pursuant to this Agreement is hereinafter  referred to as
the "Shares."

         2.       Closing Date; Delivery.

                  2.1 Closing Date.  The closing of the purchase and sale of the
Shares  hereunder (the  "Closing") will be held at the offices of Wilson Sonsini
Goodrich & Rosati, 650 Page Mill Road, Palo Alto, California 94304-1050,  on the
date hereof (the "Closing Date"), or at such other time and place as the Company
and the Purchasers may mutually agree upon.

                  2.2 Delivery. At the Closing, the Company will deliver to each
Purchaser a certificate  registered in such Purchaser's  name,  representing the
shares  of  Common  Stock  purchased  by the  Purchaser.  At the  Closing,  each
Purchaser will pay to the Company by certified check or wire transfer the amount
of the  purchase  price set forth  opposite  the name of such  Purchaser  on the
signature page of such Purchaser attached hereto.

         3.        Definitions. Unless the context otherwise requires, the terms
defined  in this  Section 3 shall have the  meanings  herein  specified  for all
purposes of this Agreement.

                   "Affiliate"  shall  have the  meaning  set  forth in Rule 405
under the Securities Act.

                   "Agreement"  means this  agreement,  including  the  exhibits
hereto.

                   "Certificate"  means the Certificate of  Incorporation of the
Company as filed  with the  Delaware  Secretary  of State as amended to the date
hereof.

                  "Closing" is defined in Section 2.1.



                                       -1-

<PAGE>



                  "Closing Date" is defined in Section 2.1.

                  "Commission" means the Securities and Exchange Commission.

                  "Common  Stock"  means the  shares of Common  Stock,  $.01 par
value,  authorized by the  Certificate,  any  additional  shares of Common Stock
which may be authorized  in the future by the Company,  and any stock into which
such Common Stock may hereafter be changed, and shall also include capital stock
of any other class of the Company  which is not  preferred  as to  dividends  or
assets  over any other class of stock of the Company and which is not subject to
redemption.

                  "Company  SEC  Reports"  shall mean the  Company's  (i) Annual
Reports on Form 10-K for the fiscal years ended June 30, 1995 and June 30, 1996,
each as amended,  as filed with the  Commission,  and (ii) Quarterly  Reports on
Form 10-Q for the fiscal  quarters  ended  September  30, 1996 and  December 31,
1996, as filed with the Commission.

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

                  "Securities  Act" means the Securities Act of 1933, as amended
from time to time.

                  "Shares" is defined in Section 1.

         4.        Representations  and  Warranties by the Company.  The Company
represents and warrants to the Purchasers as of the date hereof that:

                  4.1  Organization  and Standing.  The Company is a corporation
duly  organized  and validly  existing  under,  and by virtue of, and is in good
standing  under  the  laws of the  State  of  Delaware,  and  has the  requisite
corporate power and authority to own its properties and to carry on its business
as now being  conducted.  The Company is  qualified  to do business  and in good
standing as a foreign  corporation in every  jurisdiction in which its ownership
of property or conduct of business  requires it so to be qualified  and in which
the failure to so qualify would have a material  adverse affect on the financial
condition or business of the Company.

                  4.2  Reports  and  Financial   Statements.   The  Company  has
furnished  the  Purchasers  with true and  complete  copies of its  Company  SEC
Reports (without  exhibits  thereto).  As of their respective  filing dates, the
Company SEC Reports were prepared in all material  respects in  accordance  with
the  requirements of the Securities Act or the Exchange Act, as the case may be,
and the rules and  regulations of the Commission  thereunder  applicable to such
Company SEC Reports.

                  4.3 No Material Adverse Change.  Since the respective dates as
of which  information  is given in the  Company SEC  Reports,  there has been no
material  adverse  change in the  condition,  financial or  otherwise,  business
affairs or business prospects of the Company and its subsidiaries  considered as
one enterprise, whether or not arising in the normal course of business.




                                       -2-

<PAGE>



                  4.4 Shares.  The Shares,  when issued and paid for pursuant to
the terms of the  Agreement,  will be duly and  validly  authorized,  issued and
outstanding, fully paid, nonassessable and free and clear of all pledges, liens,
encumbrances and restrictions.

                  4.5 Corporate  Acts and  Proceedings.  This Agreement has been
duly authorized by the requisite corporate action and has been duly executed and
delivered by an  authorized  officer of the Company,  and is a valid and binding
obligation of the Company,  enforceable in accordance with its terms,  except as
such  enforceability  may be  limited  by  bankruptcy,  insolvency,  moratorium,
reorganization  or other similar laws  affecting the  enforcement  of creditors'
rights  generally  and as to  limitations  on the  enforcement  of the remedy of
specific  performance  and other  equitable  remedies.  The requisite  corporate
action necessary to the  authorization,  creation,  issuance and delivery of the
Shares has been taken by the Company.

                   4.6  No  Implied   Representations.   All  of  the  Company's
representations  and  warranties  are  contained in this  Agreement and no other
representations or warranties by the Company shall be implied.

         5.        Representations    and   Warranties   by   the    Purchasers;
Restrictions on Transfer.

                   Each Purchaser  hereby  severally  represents and warrants to
the Company as of the date hereof, as follows:

                   5.1  Authorization.  Purchaser  has all  requisite  legal and
corporate or other power and capacity and has taken all  requisite  corporate or
other action to execute and deliver the Agreement,  to purchase the Shares to be
purchased  by it and to carry out and perform all of its  obligations  under the
Agreement.  The Agreement constitutes the legal, valid and binding obligation of
the  Purchaser,  enforceable  in  accordance  with  its  terms,  except  as such
enforceability   may  be  limited   by   bankruptcy,   insolvency,   moratorium,
reorganization  or other similar laws  affecting the  enforcement  of creditors'
rights  generally  and as to  limitations  on the  enforcement  of the remedy of
specific performance and other equitable remedies.

                   5.2  Investment  Experience.   Purchaser  is  an  "accredited
investor" as defined in Rule 501(a)(1), (a)(2), (a)(3), (a)(5), (a)(6) or (a)(7)
or a  "Qualified  Institutional  Buyer"  as  defined  in  Rule  144A  under  the
Securities  Act.  Purchaser  is  aware of the  Company's  business  affairs  and
financial   condition  and  has  had  access  to  and  has  acquired  sufficient
information about the Company to reach an informed and knowledgeable decision to
acquire the Shares.  Purchaser has such business and financial  experience as is
required to give it the capacity to protect its own interests in connection with
the purchase of the Shares. Purchaser is not a "broker" or a "dealer" as defined
in the Exchange Act and is not an  "affiliate"  of the Company as defined in the
Securities Act.

                   5.3 Investment Intent. Purchaser is purchasing the Shares for
its own account as  principal,  for  investment  purposes  only,  and not with a
present view to, or for, resale,  distribution or  fractionalization thereof, in
whole  or  in  part,  within  the  meaning  of  the  Securities  Act.  Purchaser
understands that its acquisition of the Shares has not been registered under the
Securities  Act or registered  or qualified  under any state  securities  law in
reliance on specific  exemptions  therefrom,  which  exemptions may depend upon,
among other things,  the bona fide nature of  Purchaser's  investment  intent as
expressed herein.



                                       -3-

<PAGE>



Purchaser has, in connection  with its decision to purchase the number of Shares
set forth in the Agreement,  relied solely upon  the Company SEC Reports and the
representations  and warranties of the Company contained herein.  Purchaser will
not, directly or indirectly,  offer, sell, pledge, transfer or otherwise dispose
of (or solicit any offers to buy, purchase or otherwise acquire or take a pledge
of) any of the Shares except in compliance with the Securities Act and the rules
and regulations promulgated thereunder.

                   5.4 Registration or Exemption Requirements. Purchaser further
acknowledges  and  understands  that the Shares  may not be resold or  otherwise
transferred  except in a  transaction  registered  under the  Securities  Act or
unless an exemption from such registration is available.   Purchaser understands
that the certificates evidencing the Shares will be imprinted with a legend that
prohibits the transfer of the Shares unless (a) such  transaction  is registered
or such registration is not required,  and (b) if the transfer is pursuant to an
exemption from registration other than Rule 144 under the Securities Act, and if
the Company shall so request in writing,  an opinion reasonably  satisfactory to
the Company,  delivered by counsel  reasonably  satisfactory to the Company,  is
obtained to the effect that the transaction is so exempt.

                   5.5 No Legal, Tax or Investment Advice. Purchaser understands
that nothing in the Company SEC Reports,  the  Agreement or any other  materials
presented to Purchaser  in  connection  with the purchase and sale of the Shares
constitutes legal, tax or investment advice. Purchaser has consulted such legal,
tax and investment advisors as it, in its sole discretion,  has deemed necessary
or appropriate in connection with its purchase of the Shares.

         6.        Restrictions on  Transferability  of Shares;  Compliance with
Securities Act.

                  6.1 Restrictions on  Transferability.  The Shares shall not be
transferable  in the  absence of  registration  under the  Securities  Act or an
exemption  therefrom  or in the  absence  of  compliance  with  any  term of the
Agreement.

                   6.2 Restrictive  Legend.  Each  certificate  representing the
Shares  shall bear  substantially  the  following  legends  (in  addition to any
legends required under applicable state securities laws):

                  THE  SECURITIES  REPRESENTED  BY THIS  CERTIFICATE  HAVE  BEEN
                  ACQUIRED  FOR  INVESTMENT  PURPOSES  ONLY  AND  HAVE  NOT BEEN
                  REGISTERED  UNDER THE SECURITIES ACT OF 1933, AS AMENDED.  THE
                  SECURITIES  MAY NOT BE SOLD OR  TRANSFERRED  IN THE ABSENCE OF
                  SUCH REGISTRATION OR AN EXEMPTION THEREFROM.

                  6.3 Transfer of Shares.  Each Purchaser  hereby covenants with
the  Company  not to make any sale of the  Shares  except  either  (a) a sale of
Shares  in  accordance  with  the  Registration  Statement,  in  which  case the
Purchaser  covenants  to comply with the  requirement  of  delivering  a current
prospectus,  (b) a sale of Shares in accordance with Rule 144, in which case the
Purchaser  covenants  to comply  with Rule 144 and to  deliver  such  additional
certificates and documents as the Company may reasonably request, or (c) subject
to such  conditions  as the  Company in its sole  discretion  shall  impose,  in
accordance  with another  exemption from the  registration  requirements  of the
Securities  Act.  The  legend set forth in  Section  6.2 will be removed  from a
certificate representing Shares following and in



                                       -4-

<PAGE>



connection  with any sale of Shares pursuant to subsection (a) or (b) hereof but
not in connection with any sale of Shares pursuant to subsection (c) hereof.

         7.       Conditions to Closing.

                   7.1 Conditions to Obligations of Purchasers.  The obligations
of each Purchaser hereunder shall be subject to the following conditions:

                            (a)  The   representations  and  warranties  of  the
Company shall be true and accurate on the Closing Date; and

                            (b) The Company  shall have executed and delivered a
Registration  Rights  Agreement  substantially  in the form  attached  hereto as
Exhibit B.

                            (c) The aggregate purchase price for the Shares sold
hereunder shall be equal to or greater than $6,800,000.

                  7.2 Conditions to Obligations of Company.  The  obligations of
the Company hereunder shall be subject to the condition that the representations
and warranties of the Purchasers shall be true and accurate on the Closing Date.

         8.       Miscellaneous.

                  8.1   Survival  of   Representations   and   Warranties.   All
representations and warranties  contained herein shall survive the execution and
delivery of this Agreement,  any  investigation at any time made by or on behalf
of the Purchaser, and the sale and purchase of the Shares and payment therefor.

                  8.2 Parties in Interest.  All the terms and provisions of this
Agreement  shall be binding upon and inure to the benefit of and be  enforceable
by the respective successors and assigns of the parties hereto.

                  8.3 Headings.  The headings of the sections of this  Agreement
have been inserted for  convenience  of reference  only and do not  constitute a
part of this Agreement.

                  8.4 Choice of Law. It is the intention of the parties that the
internal  laws of the  State  of  Delaware,  without  regard  to the body of law
controlling  conflicts of law, shall govern the validity of this Agreement,  the
construction of its terms and the interpretation of the rights and duties of the
parties set forth herein.

                  8.5 Counterparts.  This Agreement may be executed concurrently
in two or more counterparts,  each of which shall be deemed an original, but all
of which together shall constitute one and the same instrument.


                  [Remainder of Page Intentionally Left Blank]




                                       -5-

<PAGE>



         IN WITNESS  WHEREOF,  the parties have caused this Agreement to be duly
executed and delivered by their proper and duly authorized representatives as of
the day and year first above written.


                                       CYBERONICS, INC.



                                       By:/s/ Robert P. Cummins
                                          -------------------------------
                                          Name:  Robert P. Cummins
                                          Title:  Chief Executive Officer


                                       THE FERNLEIGH FOUNDATION


                                       By:/s/ Kevin S. Moore
                                          ------------------------------
                                          Name:  Kevin S. Moore
                                          Title:  Treasurer


                                       THE CLARK FOUNDATION


                                       By:/s/ Kevin S. Moore
                                          -----------------------------
                                          Name:  Kevin S. Moore
                                          Title:  Treasurer


                                       THE SCRIVEN FOUNDATION


                                       By:/s/ Kevin S. Moore
                                          -----------------------------
                                          Name:  Kevin S. Moore
                                          Title:  Treasurer


                                       THE MARY IMOGENE BASSETT HOSPITAL-
                                       SCC RESEARCH FUND


                                       By:/s/ Kevin S. Moore
                                          ------------------------------
                                           Name:  Kevin S. Moore
                                           Title:  Treasurer





                                       -6-

<PAGE>



                                       THE FARMERS' MUSEUM, INC.


                                       By:/s/ Richard C. Vanison
                                          ------------------------------
                                          Name:  Richard C. Vanison
                                          Title:  Treasurer


                                       ANNUITY TRUST FOR KATHRYN J. CLARK
                                       u/w STEPHEN C. CLARK, JR. ART 18


                                       By:/s/ Edward W. Stack
                                          ------------------------------
                                          Name:  Edward W. Stack
                                          Title:  Trustee


                                       TRUST FOR MARTIN PERETZ, 1976


                                       By:/s/ Kevin S. Moore
                                          ------------------------------
                                          Name:  Kevin S. Moore
                                          Title:  Trustee


                                       TRUST FOR ANNE L. PERETZ, 1944


                                       By:/s/ Edward W. Stack
                                          ------------------------------
                                          Name:  Edward W. Stack
                                          Title:  Trustee


                                       EDMUND S. TWINING III


                                       By:/s/ Kevin S. Moore
                                          ------------------------------
                                          Name:  Kevin S. Moore
                                          Title:  Attorney in Fact





                                       -7-

<PAGE>



                                        TRUST FOR DOROTHY POTTER BOARDMAN


                                       By:/s/ Edward W. Stack
                                          ------------------------------
                                          Name:  Edward W. Stack
                                          Title:  Trustee


                                       TRUST FOR SUSAN CLARK TWINING, 1946


                                       By:/s/ Edward W. Stack
                                          ------------------------------
                                          Name:  Edward W. Stack
                                          Title:  Trustee


                                       THE SCRIVEN FOUNDATION - M FUND


                                       By:/s/ Kevin S. Moore
                                          ------------------------------
                                          Name:  Kevin S. Moore
                                          Title:  Treasurer


                                       THE MARY IMOGENE BASSETT HOSPITAL-
                                       TRUSTEE FUND


                                       By:/s/ Kevin S. Moore
                                          ------------------------------
                                           Name:  Kevin S. Moore
                                           Title:  Treasurer


                                       EVE C. LABOUISSE


                                       By:/s/ Kevin S. Moore
                                          ------------------------------
                                          Name:  Kevin S. Moore
                                          Title:  Attorney in Fact





                                       -8-

<PAGE>



                                       NEW YORK STATE HISTORICAL
                                       ASSOCIATION - STEPHEN C. CLARK FUND


                                       By:/s/ Kevin S. Moore
                                          ------------------------------
                                          Name:  Kevin S. Moore
                                          Title:  Treasurer


                                       JANE FORBES CLARK


                                       By:/s/ Kevin S. Moore
                                          ------------------------------
                                          Name:  Kevin S. Moore
                                          Title:  Attorney in Fact


                                       TRUST FOR EVGENIA S. PERETZ


                                       By:/s/ Edward W. Stack
                                          ------------------------------
                                          Name:  Edward W. Stack
                                          Title:  Trustee


                                       TRUST FOR JESSE W. PERETZ


                                       By:/s/ Edward W. Stack
                                          ------------------------------
                                          Name:  Edward W. Stack
                                          Title:  Trustee


                                       TRUST FOR DAVID L. FARNSWORTH


                                       By:/s/ Edward W. Stack
                                          ------------------------------
                                          Name:  Edward W. Stack
                                          Title:  Trustee





                                       -9-

<PAGE>



                                       TRUST FOR ANNE E. FARNSWORTH


                                       By:/s/ Edward W. Stack
                                          ------------------------------
                                          Name:  Edward W. Stack
                                          Title:  Trustee


                                       RESIDUARY TRUST FOR JANE FORBES
                                       CLARK II


                                       By:/s/ Kevin S. Moore
                                          ------------------------------
                                          Name:  Kevin S. Moore
                                          Title:  Trustee


                                       CLARA WELCH THANKSGIVING HOME, INC.


                                       By:/s/ Richard c. Vanison
                                          ------------------------------
                                          Name:  Richard C. Vanison
                                          Title:  Treasurer


                                       RESIDUARY TRUST u/w SUSAN CLARK
                                       TWINING


                                       By:/s/ Jane Forbes Clark
                                          ------------------------------
                                          Name:  Jane Forbes Clark
                                          Title:  Trustee


                                       DIANA R. TWINING


                                       By:/s/ Kevin S. Moore
                                          ------------------------------
                                          Name:  Kevin S. Moore
                                          Title:  Attorney in Fact





                                      -10-

<PAGE>



                                      Capital Research and Management Company on
                                      behalf of SMALLCAP World Fund, Inc.


                                       By:/s/ Catherine M. Ward
                                          ------------------------------
                                          Name:  Catherine M. Ward
                                          Title:  Senior Vice President


                                       AEOW 96, LLC


                                       By:/s/ Will K. Weinstein
                                          ------------------------------
                                          Name:  Will K. Weinstein
                                          Title:  Member Manager



                                       STANLEY H. APPEL, M.D.


                                       By:/s/ Stanley H. Appel
                                          ------------------------------



                                        ROBERT P. CUMMINS


                                       By:/s/ Robert P. Cummins
                                          ------------------------------


                                       MARILYN LUNNEY


                                       By:/s/ Marilyn Lunney
                                          ------------------------------



                                       WILLIAM H. DUFFELL, JR.


                                       By:/s/ William H. Duffell, Jr.
                                          ------------------------------







                                      -11-

<PAGE>



                                       IRA FBO ROBERT P. CUMMINS, DLJSC AS
                                       CUSTODIAN


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



                                      ROBERT P. CUMMINS AS CUSTODIAN FOR
                                      LINDA G. CUMMINS UNDER THE TEXAS
                                      UNIFORM TRANSFERS TO MINORS ACT


                                       By:/s/ Robert P. Cummins
                                          ------------------------------
                                          Name:  Robert P. Cummins
                                          Title:  Custodian








                                      -12-

<PAGE>



                                    EXHIBIT A

                             Schedule of Purchasers




                                                   NUMBER OF          AGGREGATE
                                                     SHARES            PURCHASE
    NAME AND ADDRESS OF PURCHASER                  PURCHASED            PRICE
    -----------------------------                  ---------          ----------
THE FERNLEIGH FOUNDATION                              16,000           71,000.00
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
THE CLARK FOUNDATION                                 347,408        1,541,623.00
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
THE SCRIVEN FOUNDATION                                82,000          363,875.00
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
THE MARY IMOGENE BASSETT HOSPITAL -                   15,000           66,562.50
SCC RESEARCH FUND
c/o The Clark  Estates
30 Wall Street,  
9th Floor New York, NY
10005
THE FARMERS' MUSEUM, INC.                             60,000          266,250.00
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
ANNUITY TRUST FOR KATHRYN J. CLARK                    10,000           44,375.00
u/w STEPHEN C. CLARK, JR. ART. 18
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
TRUST FOR MARTIN PERETZ, 1976                          6,000           26,625.00
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005




                                       -1-

<PAGE>



                                                   NUMBER OF         AGGREGATE
                                                     SHARES           PURCHASE
    NAME AND ADDRESS OF PURCHASER                  PURCHASED           PRICE
TRUST FOR ANNE L. PERETZ, 1944                       20,000            88,750.00
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
EDMUND S. TWINING III                                20,000            88,750.00
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
TRUST FOR DOROTHY POTTER BOARDMAN                    12,000            53,250.00
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
TRUST FOR SUSAN CLARK TWINING, 1946                  14,000            62,125.00
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
THE SCRIVEN FOUNDATION - M FUND                      70,000           310,625.00
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
THE MARY IMOGENE BASSETT HOSPITAL -                  22,000           97,625.00
TRUSTEE FUND
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
EVE C. LABOUISSE                                     30,000           133,125.00
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
NEW YORK STATE HISTORICAL                            30,000           133,125.00
ASSOCIATION - STEPHEN C. CLARK FUND
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
JANE FORBES CLARK                                    70,000           310,625.00
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005




                                       -2-

<PAGE>



                                                   NUMBER OF          AGGREGATE
                                                     SHARES            PURCHASE
    NAME AND ADDRESS OF PURCHASER                  PURCHASED            PRICE

TRUST FOR EVGENIA S. PERETZ                          4,000            17,750.00
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
TRUST FOR JESSE W. PERETZ                            4,000             17,750.00
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
TRUST FOR DAVID L. FARNSWORTH                        4,000            17,750.00
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
TRUST FOR ANNE E. FARNSWORTH                         4,000             17,750.00
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
RESIDUARY TRUST FOR JANE FORBES                     35,000            155,312.50
CLARK II
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
CLARA WELCH THANKSGIVING HOME, INC.                  4,000             17,750.00
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
RESIDUARY TRUST u/w SUSAN CLARK                     20,000             88,750.00
TWINING
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
DIANA R. TWINING                                     2,000              8,875.00
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005







                                       -3-

<PAGE>



                                                   NUMBER OF         AGGREGATE
                                                     SHARES           PURCHASE
    NAME AND ADDRESS OF PURCHASER                  PURCHASED           PRICE
    -----------------------------                  ---------          ----------
SMALLCAP WORLD FUND, INC.                           494,000         2,192,125.00
(Registered in the name of Kane & Co.)
c/o Capital Research & Management Company
Attn:  James P. Ryan
333 South Hope Street
Los Angeles, CA  90071
AEOW 96, LLC                                         56,339           250,004.31
c/o Genesis Merchant Group
Attn:  Will K. Weinstein
909 Montgomery Street, #600
San Francisco, CA  94133
STANLEY H. APPEL, M.D.                               40,000           177,500.00
c/o Baylor College of Medicine
1 Baylor Place
Houston, TX  77030
ROBERT P. CUMMINS                                     7,750           100,953.12
c/o Cyberonics, Inc.
17448 Highway 3, Suite 100
Webster, TX  77598
MARILYN LUNNEY                                        6,000            26,625.00
c/o Cyberonics, Inc.
Attn:  Shawn Lunney
17448 Highway 3, Suite 100
Webster, TX  77598
WILLIAM H. DUFFELL, JR.                               1,127             5,001.06
c/o Cyberonics, Inc.
17448 Highway 3, Suite 100
Webster, TX  77598
IRA FBO ROBERT P. CUMMINS,                            7,750            34,390.63
DLJSC AS CUSTODIAN
c/o Donaldson Lufkin Jenrette







                                       -4-

<PAGE>



                                                   NUMBER OF         AGGREGATE
                                                     SHARES            PURCHASE
    NAME AND ADDRESS OF PURCHASER                  PURCHASED            PRICE
    -----------------------------                  ---------          ----------
ROBERT P. CUMMINS AS CUSTODIAN                       5,000             22,187.50
FOR LINDA G. CUMMINS UNDER THE
TEXAS UNIFORM TRANSFERS TO
MINORS ACT
c/o Cyberonics, Inc.
Attn:  Robert P. Cummins
17448 Highway 3, Suite 100
Webster, TX  77598




                                       -5-

<PAGE>


                         COMMON STOCK PURCHASE AGREEMENT

                                CYBERONICS, INC.




                                                    March 28, 1997




                                       -1-

<PAGE>
                                                                      EXHIBIT B

                          REGISTRATION RIGHTS AGREEMENT


         THIS REGISTRATION RIGHTS AGREEMENT (the "Agreement") is made as of this
28 day of March,  1997, by and among  Cyberonics,  Inc., a Delaware  Corporation
(the  "Company")  and the  stockholders  whose  names are set forth on Exhibit A
hereto (the "Stockholders").

                                    Recitals

         WHEREAS, the Company and the Stockholders are parties to a Common Stock
Purchase  Agreement dated the date hereof pursuant to which the Stockholders are
purchasing an aggregate of up to 1,700,000  shares of the Company's Common Stock
(the "Shares");

         WHEREAS,  the  Company  has agreed to  provide  the  Stockholders  with
certain rights to register the Shares as provided herein;

         NOW THEREFORE,  in  consideration  of the mutual promises and covenants
hereinafter set forth, the parties hereby agree as follows:

         1.       Certain Definitions.  As used in this Agreement, the following
terms shall have the following respective meanings:

                  "Commission" shall mean the Securities and Exchange Commission
or any other federal agency at the time administering the Securities Act.

                  "Exchange Act" shall mean the Securities Exchange Act of 1934,
as amended, and the rules and regulations promulgated thereunder.

                  "Holder"  shall  mean  any  Stockholder   holding  Registrable
Securities  and any Person  holding  Registrable  Securities  to whom the rights
under this  Agreement  have been  transferred  in  accordance  with  Section 3.8
hereof.

                  "Initiating   Holders"   shall   mean  any   Stockholders   or
transferees  of  Stockholders  under Section 3.8 hereof who in the aggregate are
Holders of not less than 50% of the then outstanding Registrable Securities.

                  "Person" shall mean an individual,  corporation,  partnership,
limited liability company,  association,  joint-stock  company,  trust where the
interests  of the  beneficiaries  are  evidenced  by a security,  unincorporated
organization,   estate,   governmental  or  political   subdivision  thereof  or
governmental agency.

                  "Public  Offering"  shall mean the closing of an  underwritten
public  offering  of  Common  Stock  registered  with the  Commission  under the
Securities Act.



                                       -1-

<PAGE>



                  "Registrable  Securities"  means (i) the  Shares  and (ii) any
Common Stock of the Company issued or issuable in respect of the Shares upon any
stock split, stock dividend,  recapitalization,  or similar event;  excluding in
all cases, however, any Registrable Securities sold by a Holder including a sale
pursuant  to a  registration  statement  under  this  Agreement,  a  transaction
pursuant to Rule 144 or any other transaction in which  registration  rights are
not transferred pursuant to Section 3.8 hereof.

                  "Registration  Statement" shall mean a registration  statement
provided  for in Section 6 of the  Securities  Act under  which  securities  are
registered  under the Securities Act,  together with any  preliminary,  final or
summary prospectus  contained therein,  any amendment or supplement thereto, and
any document incorporated by reference therein.

                  The terms "register," "registered" and "registration" refer to
a  registration  effected by preparing  and filing a  registration  statement in
compliance  with the  Securities  Act,  and the  declaration  or ordering of the
effectiveness of such registration statement.

                  "Registration  Expenses"  shall mean all expenses,  other than
Selling  expenses (as defined below),  incurred by the Company in complying with
Sections 3.1 or 3.2 hereof,  including,  without  limitation,  all registration,
qualification  and  filing  fees,  printing  expenses,  escrow  fees,  fees  and
disbursements  of  counsel  for the  Company,  blue sky fees and  expenses,  the
expense of any special audits  incident to or required by any such  registration
(but excluding the compensation of regular  employees of the Company which shall
be paid in any event by the Company) and the reasonable  fees and  disbursements
of one counsel for all Holders.

                  "Rule  144"  shall  mean  Rule  144   promulgated   under  the
Securities Act.

                  "Securities  Act" shall mean the  Securities  Act of 1933,  as
amended,  or any similar  federal  statute and the rules and  regulations of the
Commission thereunder, all as the same shall be in effect at the time.

                  "Selling  Expenses"  shall  mean  all  underwriting  discounts
selling  commissions  and stock  transfer  taxes  applicable  to the  securities
registered  by the  Holders  and,  except  as set  forth  in the  definition  of
"Registration  Expenses"  above,  all fees and  disbursements of counsel for any
Holder.

         2.       Notice of Proposed Transfers.

                  2.1  Restriction  on  Transfer.  The Shares shall not be sold,
assigned,  transferred or pledged  except upon the conditions  specified in this
Agreement,   which  conditions  are  intended  to  ensure  compliance  with  the
provisions  of the  Securities  Act.  Each  Stockholder  will cause any proposed
purchaser,  assignee,  transferee, or pledgee of the Shares to agree to take and
hold such securities subject to the provisions and upon the conditions specified
in this Agreement. If a Holder wishes to sell Registrable Securities (other than
in a registered  offering pursuant to Section 3 hereof,  pursuant to Rule 144 or
pursuant to a  permitted  transfer  pursuant  to Section  2.2  below),  it shall
deliver a written  notice to the Company  disclosing  in  reasonable  detail the
terms and  conditions of the proposed sale and shall provide to the Company,  at
such Holder's expense either (i) a written opinion of legal counsel who


                                       -2-

<PAGE>



shall be, and whose  legal  opinion  shall be,  reasonably  satisfactory  to the
Company,  addressed to the Company,  to the effect that the proposed transfer of
the Shares may be effected  without  registration  under the Securities  Act, or
(ii) a "no action" letter from the Commission to the effect that the transfer of
such securities without  registration will not result in a recommendation by the
staff of the Commission that action be taken with respect thereto.

                  2.2 Permitted Transfers.  Notwithstanding  Section 2.1 hereof,
any Holder may transfer the whole or any part of the Registrable  Securities and
all rights  provided in this Agreement with respect thereto (a) to any entity or
Person whose affairs are under common management with a Stockholder,  (b) to any
partners,  or  retired  partners,  or to the estate of any  partners  or retired
partners of a Stockholder  which is a partnership,  and (c) to any  stockholder,
parent  or  subsidiary  corporation  of a  Stockholder  which is a  corporation;
provided that the Transferee  enters into an Agreement with the Stockholders and
the  Company  in which  the  Transferee  shall be bound by and  entitled  to the
benefit of the provisions of this Agreement.

                  2.3 Stockholder  Covenant.  No Holder shall mortgage,  pledge,
charge,  hypothecate,  grant a security interest in, or otherwise  encumber,  or
allow or permit any charge, security interest,  encumbrance,  pledge,  mortgage,
hypothecation,  lien or adverse claim to attach to,  affect or encumber,  his or
its Registrable Securities or any part thereof, or any interest therein.

                  2.4  Restrictive   Legend.   Each   certificate   representing
Registrable  Securities  shall be stamped or  otherwise  imprinted  with legends
substantially  in the following  form (in addition to any legend  required under
applicable state securities laws or otherwise):

                  "THE SHARES REPRESENTED BY THIS CERTIFICATE HAVE BEEN ACQUIRED
                  FOR  INVESTMENT  AND  HAVE  NOT  BEEN  REGISTERED   UNDER  THE
                  SECURITIES  ACT OF  1933.  SUCH  SHARES  MAY  NOT BE  SOLD  OR
                  TRANSFERRED IN THE ABSENCE OF SUCH  REGISTRATION OR UNLESS THE
                  COMPANY RECEIVES AN OPINION OF COUNSEL  REASONABLY  ACCEPTABLE
                  TO IT STATING  THAT SUCH SALE OR  TRANSFER  IS EXEMPT FROM THE
                  REGISTRATION  AND  PROSPECTUS  DELIVERY  REQUIREMENTS  OF SAID
                  ACT."

                  Each Stockholder  consents to the Company making a notation on
its records and giving instructions to any transfer agent of the Common Stock in
order to implement the restrictions on transfer established in this Agreement.

         3.       Registration Rights.

                  3.1      Requested Registration.

                           (a) In case the Company shall receive from Initiating
Holders  a  written   request   that  the  Company   effect  any   registration,
qualification or compliance with respect to a proposed registration of Shares (a
"Requested  Registration") with an aggregate offering price to the public of (x)
at


                                      -3-

<PAGE>



least $1,000,000 if such registration may be effected pursuant to a Registration
Statement on Form S-3 (or a successor  form) or (y) at least  $5,000,000 if such
registration  is effected  pursuant to a Registration  Statement on a form other
than Form S-3, the Company will:

                                    (i)  promptly  give  written  notice  of the
proposed registration, qualification or compliance to all other Holders; and

                                    (ii) as soon as  practicable,  use its  best
lawful  efforts  to  effect  such  registration,   qualification  or  compliance
(including, without limitation,  appropriate qualification under applicable blue
sky or other state  securities law and  appropriate  compliance  with applicable
regulations   issued  under  the  Securities  Act  and  any  other  governmental
requirements or  regulations)  as may be so requested by the Initiating  Holders
and as would  permit  or  facilitate  the sale and  distribution  of all or such
portion  of such  Registrable  Securities  as are  specified  in  such  request,
together with all or such portion of the  Registrable  Securities of any Holders
joining in such request as are  specified in a written  request  received by the
Company  within 20 days after  receipt of such written  notice from the Company;
provided, however, that the Company shall not be obligated to take any action to
effect any such  registration,  qualification  or  compliance  pursuant  to this
Section 3.1:

                                            (A) In any  particular  jurisdiction
in which the Company  would be required to execute a general  consent to service
of process in effecting such  registration,  qualification or compliance  unless
the Company is already subject to service in such jurisdiction and except as may
be required by the Securities Act;

                                            (B) During the period  starting with
the date sixty (60) days prior to the Company's estimated date of filing of, and
ending on the date three (3) months immediately following the effective date of,
any registration statement pertaining to securities of the Company (other than a
registration  of  securities  in a Rule 145  transaction  or with  respect to an
employee benefit plan), providing that the Company is actively employing in good
faith all  reasonable  efforts to cause such  registration  statement  to become
effective  (and  provided,  further,  that the Company  cannot  pursuant to this
Section  3.l(a)(ii)(B)  delay  implementation  of a demand for registration more
than once in any 12-month period);

                                            (C) After the Company  has  effected
two such  registrations  pursuant to this subsection  3.1(a);  provided,  that a
registration will only be counted for purposes of this Section  3.1(a)(ii)(C) if
(x) such  registration has been declared or ordered  effective,  and (y) no stop
order,  injunction  or the like has been  entered  barring  sales of  securities
thereunder  (other than a stop order,  injunction  or the like which is promptly
resolved,  in which case the Company  shall use its best lawful  efforts to keep
the  Registration  Statement  effective  for an  additional  period equal to the
period during which the stop order, injunction or the like barred sales); or

                                            (D) If the Company  shall furnish to
such Holders a certificate  signed by the President of the Company  stating that
in the good  faith  judgment  of the Board of  Directors  it would be  seriously
detrimental to the Company or its shareholders  for a registration  statement to
be filed in the near  future,  then  the  Company's  obligation  to use its best
lawful efforts to register, qualify or


                                       -4-

<PAGE>



comply under this Section 3.1 shall be deferred once (with respect to any demand
for registration hereunder) for a period not to exceed ninety (90) days from the
date of receipt of written  request from the Initiating  Holders,  provided that
the Company  may, by  furnishing  another  certificate  pursuant to this Section
3.1(a)(ii)(D),  delay  implementation  of a  demand  for  registration  for  one
additional period of up to ninety (90) days. In the event of such a delay by the
Company,  the Initiating  Holders will be entitled to withdraw their request for
such Requested Registration,  in which case such right of Requested Registration
shall be restored under Section 3.1(a)(C) hereof.

                           Subject to the foregoing clauses (A) through (D), the
Company shall file a registration  statement covering the Registrable Securities
so requested  to be  registered  as soon as  practicable,  after  receipt of the
request or requests of the Initiating Holders.

                           (b) The Company may register  securities for sale for
its own account in any registration  requested  pursuant to this Section 3.1 and
may also register restricted  securities held by other  stockholders;  provided,
however,  that in the  event  that the  number of  shares  to be  included  in a
registration is to be limited,  then securities to be sold for the Company's own
account and restricted securities held by other stockholders shall be eliminated
from the  registration  prior to reducing the number of Shares  included in such
registration.

                  3.2      Company Registration.

                           (a)  Notice of  Registration.  If at any time or from
time to time the Company  shall  determine  to register  any of its  securities,
either for its own account or the account of a security holder or holders, other
than (i) a registration  relating  solely to employee  benefit plans,  or (ii) a
registration  relating solely to a Commission Rule 145 transaction,  the Company
will:

                                    (i)  promptly  give to each  Holder  written
notice thereof; and

                                    (ii) include in such  registration  (and any
related  qualification  under  blue sky laws or  other  compliance),  and in any
underwriting  involved therein,  all the Registrable  Securities  specified in a
written  request or requests,  made within 20 days after receipt of such written
notice from the Company, by any Holder (a "Piggyback Registration").

                           (b)  Right to  Terminate  Registration.  The  Company
shall have the right to terminate or withdraw any  registration  initiated by it
under this  Section 3.2 (but not its  obligation  to pay  registration  expenses
pursuant to Section 3.4 hereof) prior to the  effectiveness of such registration
whether  or  not  any  Holder  has  elected  to  include   securities   in  such
registration.

                           (c)   Survival   of   Requested   Registration.    No
registration  of  Registrable  Securities  effected  under Section  3.2(a) shall
relieve the Company of its obligation to effect any Requested Registration under
Section 3.1(a) hereof.

                  3.3      Underwriting.   In  the  event  that  a  registration
pursuant to Section 3.1 or 3.2 is for a registered public offering  involving an
underwriting, the Company shall so advise the Holders as part


                                       -5-

<PAGE>



of the notice given to Holders.  In such event, the Company shall (together with
all Holders and other holders  proposing to distribute their securities  through
such underwriting)  enter into an underwriting  agreement in customary form with
the managing  underwriter  selected for such  underwriting (x) by the Company if
such  registration  is initiated by the Company or (y) by a majority in interest
of the  Holders  initially  requesting  registration  if  such  registration  is
initiated by Holders;  provided,  however, that underwriters selected by Holders
shall be subject to the Company's reasonable approval. Notwithstanding any other
provision of this Section 3.3, if the managing  underwriter  advises the Company
and the Holders in writing that  marketing  factors  require a limitation of the
number of shares to be underwritten on behalf of stockholders,  then the Company
shall so advise all Holders, and the number of shares of Registrable  Securities
that may be included in the registration and underwriting  shall be allocated as
follows:  (i) any shares which were to be included in such registration that are
not "Registrable Securities" under this Agreement would first be eliminated from
the  offering;  (ii) if further  reduction  in the number of shares is required,
then the number of shares to be included on behalf of Holders would be allocated
among all Holders requesting registration of Shares in proportion,  as nearly as
practicable,  to the respective  amounts of Registrable  Securities held by such
Holders  at the  time of  filing  the  registration  statement.  No  Registrable
Securities  excluded  from  the  underwriting  by  reason  of the  underwriter's
marketing  limitation shall be included in such registration.  To facilitate the
allocation of shares in accordance with the above provisions, the Company or the
underwriters  may round the  number of  shares  allocated  to any  Holder to the
nearest 100 shares.

                  If any  Holder of  Registrable  Securities  (or  other  holder
distributing its securities  through the underwriting)  disapproves of the terms
of the  underwriting,  such  person may elect to withdraw  therefrom  by written
notice to the Company and the managing underwriter.  The Registrable  Securities
and/or other securities so withdrawn shall also be withdrawn from registration.

                  3.4  Expenses  of  Registration.   All  Registration  Expenses
incurred in connection  with the  registrations  pursuant to Section 3.1 and all
registrations pursuant to Section 3.2 shall be borne by the Company. All Selling
Expenses  relating to  securities  registered  on behalf of the Holders or other
holders registering  securities shall be borne by the Holders or holders of such
securities pro rata on the basis of the number of shares so registered.

                  3.5 Registration Procedures. In the case of each registration,
qualification or compliance  effected by the Company pursuant to this Agreement,
the Company  will keep each Holder  advised in writing as to the  initiation  of
each  registration,  qualification  and  compliance  and  as to  the  completion
thereof. At its expense, the Company will:

                           (a)   Prepare   and  file  with  the   Commission   a
Registration  Statement  (including  amendments  and  supplements  thereto) with
respect  to such  securities  and use its best  lawful  efforts  to  cause  such
Registration  Statement to become and remain  effective for at least ninety (90)
days or until the distribution  described in the Registration Statement has been
completed;

                           (b) Furnish to each underwriter such number of copies
of a prospectus,  including a  preliminary  prospectus,  in conformity  with the
requirements of the Securities Act, and such other documents as such underwriter
may reasonably request in order to facilitate the public sale of the


                                       -6-

<PAGE>



shares by such  underwriter.  In addition,  the Company will promptly furnish to
each  underwriter  and Holder  notice of any NASDAQ  listing,  and notice of any
stop-order  or  similar  notice  issued by the  Commission  or any state  agency
charged with the  regulation  of  securities,  and use  commercially  reasonable
efforts  to  promptly  obtain  the  withdrawal  of  any  order   suspending  the
effectiveness of such Registration  Statement or sales of securities thereunder;
and

                           (c) At any time when a prospectus relating thereto is
required  to be  delivered  under the  Securities  Act,  notify  each  seller of
Registrable Securities covered by such Registration Statement promptly after the
Company discovers that the prospectus included in such Registration Statement as
then in effect includes an untrue statement of a material fact or omits to state
a  material  fact  required  to be  stated  therein  or  necessary  to make  the
statements  therein,  in the light of the  circumstances  under  which they were
made, not misleading, and at the request of any such seller promptly prepare and
furnish to such seller a reasonable  number of copies of a  supplement  to or an
amendment  of  such  prospectus  as may be  necessary  so  that,  as  thereafter
delivered  to the  purchasers  of such  securities,  such  prospectus  shall not
include 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
the light of the circumstances under which they were made, not misleading.  Each
holder of Registrable Securities agrees that upon receipt of any notice from the
Company of the  happening  of any event of the kind  described  in this  Section
3.5(c),  such holder will discontinue  immediately such holder's  disposition of
securities  pursuant to the  Registration  Statement  until such holder receives
copies of the  supplemented or amended  prospectus  contemplated by this Section
3.5(c)  and,  if so directed  by the  Company,  will  deliver to the Company all
copies,  other than permanent file copies,  then in such holder's  possession of
the prospectus  relating to such Registrable  Securities  current at the time of
receipt of such notice.

                  3.6      Indemnification.

                           (a) To the extent  permitted by law, the Company will
indemnify  each  Holder  participating  in  a  registration   pursuant  to  this
Agreement, each of such Holder's officers, directors, partners and trustees, and
each  person  controlling  such  Holder  within the meaning of Section 15 of the
Securities Act, with respect to which registration,  qualification or compliance
has been effected pursuant to this Agreement, and each underwriter,  if any, and
each person who controls any underwriter within the meaning of Section 15 of the
Securities Act, against all expenses, claims, losses, damages or liabilities (or
actions  in  respect  thereof),  including  any of  the  foregoing  incurred  in
settlement of any litigation,  commenced or threatened,  arising out of or based
on any untrue  statement  (or  alleged  untrue  statement)  of a  material  fact
contained in any registration statement,  prospectus, offering circular or other
document,  or  any  amendment  or  supplement  thereto,  incident  to  any  such
registration,  qualification or compliance, or based on any omission (or alleged
omission)  to state  therein a material  fact  required to be stated  therein or
necessary to make the statements therein, in light of the circumstances in which
they  were  made,  not  misleading,  or  any  violation  by the  Company  of the
Securities  Act or any rule or regulation  promulgated  under the Securities Act
applicable   to  the  Company  in   connection   with  any  such   registration,
qualification or compliance,  and the Company will reimburse each such Holder or
holder, each of its officers,  directors, partners and trustees, and each person
controlling  such Holder or holder,  each such  underwriter  and each person who
controls any such underwriter,  for any legal and any other expenses  reasonably
incurred in  connection  with  investigating,  preparing or  defending  any such
claim, loss,


                                       -7-

<PAGE>



damage, liability or action, provided that the Company will not be liable in any
such case to the extent that any such claim, loss, damage,  liability or expense
arises out of or is based on any untrue  statement or omission or alleged untrue
statement  or omission,  made in reliance  upon and in  conformity  with written
information  furnished  to the  Company by such  Holder,  controlling  person or
underwriter specifically for use therein. Notwithstanding the foregoing, insofar
as the  foregoing  indemnity  relates to any such untrue  statement  (or alleged
untrue  statement)  or omission (or alleged  omission)  made in the  preliminary
prospectus but eliminated or remedied in the amended prospectus on file with the
Commission at the time the registration  statement  becomes  effective or in the
final  prospectus  filed  with the  Commission  pursuant  to Rule  424(b) of the
Commission, the indemnity agreement herein shall not inure to the benefit of any
underwriter  or (if there is no  underwriter)  any Holder if a copy of the final
prospectus  filed  pursuant to Rule 424(b) was delivered to such  underwriter or
Holder,  but was not  furnished  to the  person  or entity  asserting  the loss,
liability,  claim or damage at or prior to the time such  furnishing is required
by the Securities Act.

                           (b) To the extent  permitted  by law,  each Holder or
holder will, if Registrable  Securities or other  securities held by such Holder
or  holder  are  included  in the  securities  as to  which  such  registration,
qualification  or compliance is being effected,  indemnify the Company,  each of
its  directors  and  officers,  each  underwriter,  if  any,  of  the  Company's
securities  covered by such a registration  statement,  each person who controls
the  Company  or such  underwriter  within  the  meaning  of  Section  15 of the
Securities  Act,  and each other such  Holder or holder,  each of its  officers,
directors,  partners  and trustees  and each person  controlling  such Holder or
holder  within the  meaning of Section 15 of the  Securities  Act,  against  all
claims,  losses, damages and liabilities (or actions in respect thereof) arising
out of or based on any untrue  statement  (or  alleged  untrue  statement)  of a
material fact contained in any such registration statement, prospectus, offering
circular or other  document,  or any  omission  (or alleged  omission)  to state
therein a material fact  required to be stated  therein or necessary to make the
statements  therein,  in light of the circumstances in which they were made, not
misleading,  and will  reimburse  the  Company,  such  Holders or holders,  such
directors,  officers,  partners,  trustees,  persons,  underwriters  or  control
persons for any legal or any other  expenses  reasonably  incurred in connection
with  investigating  or defending  any such claim,  loss,  damage,  liability or
action,  in each case to the extent,  but only to the  extent,  that such untrue
statement (or alleged  untrue  statement)  or omission (or alleged  omission) is
made in such  registration  statement,  prospectus,  offering  circular or other
document in reliance upon and in conformity with written  information  furnished
to  the  Company  by  such  Holder  or  holder  specifically  for  use  therein.
Notwithstanding the foregoing, the liability of each Holder or holder under this
subsection  (b) shall be limited in an amount equal to the net proceeds from the
sale of the shares sold by such Holder or holder,  unless such liability  arises
out of or is based on willful  misconduct by such Holder or holder. In addition,
insofar as the  foregoing  indemnity  relates to any such untrue  statement  (or
alleged  untrue  statement)  or  omission  (or  alleged  omission)  made  in the
preliminary  prospectus but eliminated or remedied in the amended  prospectus on
file  with  the  Commission  at the  time  the  registration  statement  becomes
effective  or in the  final  prospectus  filed  pursuant  to Rule  424(b) of the
Commission, the indemnity agreement herein shall not inure to the benefit of the
Company, any underwriter or (if there is no underwriter) any Holder if a copy of
the final  prospectus  filed  pursuant to Rule 424(b) was not  furnished  to the
person or entity asserting the loss,  liability,  claim or damage at or prior to
the time such furnishing is required by the Securities Act.



                                       -8-

<PAGE>



                           (c) Each party entitled to indemnification under this
Section 3.6 (the "Indemnified Party") shall give notice to the party required to
provide   indemnification   (the  "Indemnifying   Party")  promptly  after  such
Indemnified Party has actual knowledge of any claim as to which indemnity may be
sought,  and shall  permit the  Indemnifying  Party to assume the defense of any
such claim or any litigation resulting therefrom,  provided that counsel for the
Indemnifying  Party,  who shall conduct the defense of such claim or litigation,
shall  be  approved  by  the   Indemnified   Party  (whose  approval  shall  not
unreasonably  be withheld),  and the  Indemnified  Party may participate in such
defense at such party's  expense,  and provided  further that the failure of any
Indemnified  Party to give  notice as  provided  herein  shall not  relieve  the
Indemnifying Party of its obligations under this Agreement unless the failure to
give such notice is materially prejudicial to an Indemnifying Party's ability to
defend such action and provided further,  that the Indemnifying  Party shall not
assume the  defense  for  matters as to which there is a conflict of interest or
separate or different  defenses.  No  Indemnifying  Party, in the defense of any
such claim or  litigation,  shall,  except with the consent of each  Indemnified
Party,  consent to entry of any judgment or enter into any settlement which does
not  include as an  unconditional  term  thereof  the giving by the  claimant or
plaintiff to such  Indemnified  Party of a release from all liability in respect
to such claim or litigation.  No Indemnified Party shall consent to entry of any
judgment or enter into any settlement  without the consent of each  Indemnifying
Party.

                           (d)  If the  indemnification  provided  for  in  this
Section 3.6 is  unavailable  to an  Indemnified  Party in respect of any losses,
claims,  damages or  liabilities  referred  to therein,  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,
claims,  damages or  liabilities,  in a proportion  which  reflects the relative
fault of the Company on the one hand and of the stockholders offering securities
in the offering (the "Selling Stockholders") on the other in connection with the
statements  or  omissions  which  resulted in such  losses,  claims,  damages or
liabilities,  as  well  as any  other  relevant  equitable  considerations.  The
relative  fault of the Company on the one hand and the Selling  Stockholders  on
the other shall be determined  by reference to, among other things,  whether the
untrue or alleged  untrue  statement of material fact or the omission or alleged
omission to state a material fact relates to information  supplied in writing by
the Company or by the Selling  Stockholders  and the parties'  relevant  intent,
knowledge,  access to  information  and  opportunity  to correct or prevent such
statement or omission.  The Company and the Selling  Stockholders  agree that it
would not be just and equitable if contribution  pursuant to this Section 3.6(d)
were  based  solely  upon the  number of  entities  from whom  contribution  was
requested  or by any other method of  allocation  which does not take account of
the  equitable  considerations  referred to above in this  Section  3.6(d).  The
amount  paid or  payable  by an  Indemnified  Party as a result  of the  losses,
claims,  damages and liabilities  referred to above in this Section 3.6(d) shall
be deemed to include  any legal or other  expenses  reasonably  incurred by such
Indemnified Party in connection with  investigating or defending any such action
or claim,  subject to the provisions of Section  3.6(c) hereof.  Notwithstanding
the provisions of this Section 3.6(d), no Selling  Stockholder shall be required
to contribute any amount or make any other  payments under this Agreement  which
in the aggregate exceed the proceeds  received by such Selling  Stockholder.  No
person guilty of fraudulent  misrepresentation (within the meaning of Section 11
of the Securities Act) shall be entitled to contribution from any person who was
not guilty of such fraudulent misrepresentation.



                                       -9-

<PAGE>



                  3.7      Information by Holder.

                           (a) The Holder or Holders of  Registrable  Securities
included in any  registration  and the holder or holders of any other securities
included  in any  registration  shall  furnish to the Company  such  information
regarding such Holder or Holders,  holder or holders, the Registrable Securities
or other securities held by them and the distribution proposed by such Holder or
Holders, holder or holders as the Company may request in writing and as shall be
required  in  connection  with any  registration,  qualification  or  compliance
referred to in Section 3.

                           (b)  The   failure   of  any  Holder  or  Holders  of
Registrable  Securities  or any  holder or  holders  of other  securities  to be
included in a  registration  to furnish the  information  requested  pursuant to
Section 3.7(a) shall not affect the obligation of the Company under Section 3 to
the remaining Holder(s) or holder(s) who furnish such information unless, in the
reasonable  opinion of counsel to the Company or the underwriters,  such failure
impairs  or may  impair  the  legality  of  the  Registration  Statement  or the
underlying offering.

                  3.8 Transfer of Registration  Rights.  The rights granted to a
Stockholder  under this Agreement may be assigned to a transferee or assignee in
connection  with any  transfer or  assignment  of  Registrable  Securities  by a
purchaser  provided  that:  (i) such  transfer  may  otherwise  be  effected  in
accordance  with  applicable  securities  laws, (ii) such assignee or transferee
acquires  at  least  100,000  shares  of  Registrable   Securities  (subject  to
appropriate adjustment for stock splits, dividends, subdivisions,  combinations,
recapitalization and the like) and (iii) the Stockholder notifies the Company in
writing of the transfer or assignment  and the assignee or transferee  agrees in
writing to be bound by the provisions of this Agreement.

                  3.9      Holdback Agreements.

                           (a) Each Holder of Common Stock party  hereto  agrees
by  acquisition  of  such  Common  Stock  not  to  effect  any  public  sale  or
distribution of any equity securities of the Company during the seven days prior
to and the 120  days  after  any  Public  Offering,  Requested  Registration  or
Piggyback  Registration  has  become  effective,  except as part of such  Public
Offering, Requested Registration or Piggyback Registration,  as the case may be,
unless the managing underwriter of the Public Offering,  Requested  Registration
or Piggyback Registration otherwise agrees to such sale or distribution.

                           (b) The  Company  agrees (x) not to effect any public
sale or distribution of its equity securities or securities  convertible into or
exchangeable  or exercisable  for any of such  securities  during the seven days
prior to and the 120 days after any Public Offering,  Requested  Registration or
Piggyback  Registration  has  become  effective,  except as part of such  Public
Offering, Requested Registration or Piggyback Registration,  as the case may be,
and except  pursuant  to  registrations  on Form S-4,  S-8 or any  successor  or
similar forms thereto unless the managing  underwriter  otherwise agrees to such
sale or distribution.



                                      -10-

<PAGE>



         4.       Miscellaneous.

                  4.1  GOVERNING  LAW. THIS  AGREEMENT  SHALL BE GOVERNED IN ALL
RESPECTS BY THE INTERNAL LAWS OF THE STATE OF DELAWARE.

                  4.2  Successors  and  Assigns.  Except as  otherwise  provided
herein,  the  provisions  hereof  shall  inure to the benefit of, and be binding
upon,  the  successors,  assigns,  heirs,  executors and  administrators  of the
parties hereto.

                  4.3  Termination.  The  provisions  of  this  Agreement  shall
terminate  as to each  Holder,  at such time as such  Holder may sell all Shares
held by it in any single  three-month  period.  In addition this Agreement shall
terminate in its entirety upon the earliest to occur of the following:

                           (a) three years from the date hereof;

                           (b) the effective date of a corporate  reorganization
of the Company  which  results in the then current  stockholders  of the Company
owning less than 50% of the equity securities of the surviving  company,  or the
sale of all or substantially all of the assets of the Company; and

                           (c)  the  sale  of  all or  substantially  all of the
assets of the Company.

                  4.4  Amendment.   This  Agreement  may  be  amended,   waived,
discharged or terminated  by a written  instrument  signed by the Company and by
the holders of at least sixty  percent (60%) in interest of the aggregate of the
then outstanding Registrable Securities;  provided, however, that any amendment,
waiver,  discharge or termination  of any provision  hereof which would have the
effect of altering the rights of any Holder or Holders in relation to the rights
of any other Holder or Holders shall not be effective unless approved by Holders
of a majority in interest of the adversely affected Registrable Securities.

                  4.5 Entire Agreement.  This Agreement constitutes the full and
entire  understanding  and  agreement  between  the  parties  with regard to the
subject hereof.

                  4.6  Notices,   etc.  All  notices  and  other  communications
required  or  permitted  hereunder  shall be in  writing  and shall be mailed by
registered or certified mail, postage prepaid, or otherwise delivered by hand or
by messenger including Federal Express or similar courier service, addressed (a)
if to a  Stockholder,  at such  Stockholder's  address  set  forth on  Exhibit A
hereto, or at such other address as such Stockholder shall have furnished to the
Company in writing, or (b) if to the Company, to Cyberonics, Inc., 17448 Highway
3, Suite 100, Webster, Texas 77598, Attn: President, or at such other address as
the Company shall have furnished to the Stockholders.  Each such notice or other
communication  shall for all purposes of this  Agreement be treated as effective
upon receipt.

                  4.7 Counterparts. This Agreement may be executed in any number
of  counterparts,  each  of  which  may be  executed  by  less  than  all of the
Stockholders, each of which shall be enforceable


                                      -11-

<PAGE>



against the  parties  actually  executing  such  counterparts,  and all of which
together shall constitute one instrument.

                  4.8  Severability.  In the event  that any  provision  of this
Agreement  becomes or is declared  by a court of  competent  jurisdiction  to be
illegal,  unenforceable or void, this Agreement shall continue in full force and
effect  without said  provision;  provided  that no such  severability  shall be
effective if it materially changes the economic benefit of this Agreement to any
party.

                  4.9 Titles and  Subtitles.  The titles and  subtitles  used in
this  Agreement  are  used  for  convenience  only  and  are not  considered  in
construing or interpreting this Agreement.

                  [REMAINDER OF PAGE LEFT BLANK INTENTIONALLY]



                                      -12-

<PAGE>



         IN WITNESS  WHEREOF,  the undersigned or each of their  respective duly
authorized  officers or representatives  have executed this Agreement  effective
upon the date first set forth above.


                                       "COMPANY"

                                       CYBERONICS, INC.



                                       By:/s/ Robert P. Cummins
                                          ----------------------------
                                          Name:  Robert P. Cummins
                                          Title: Chief Executive Officer



                                       THE FERNLEIGH FOUNDATION


                                       By:/s/ Kevin S. Moore
                                          ----------------------------
                                       Name:   Kevin S. Moore
                                       Title:  Treasurer


                                       THE CLARK FOUNDATION


                                       By:/s/ Kevin S. Moore
                                          ----------------------------
                                       Name:   Kevin S. Moore
                                       Title:  Treasurer


                                       THE SCRIVEN FOUNDATION


                                       By:/s/Kevin S. Moore
                                          ----------------------------
                                       Name:   Kevin S. Moore
                                       Title:  Treasurer




                                      -13-

<PAGE>



                                       THE MARY IMOGENE BASSETT HOSPITAL-SCC
                                       RESEARCH FUND


                                       By:/s/ Kevin S. Moore
                                          ----------------------------
                                          Name:   Kevin S. Moore
                                          Title:  Treasurer


                                       THE FARMERS' MUSEUM, INC.


                                       By:/s/ Richard C. Vanison
                                          ----------------------------
                                          Name:   Richard C. Vanison
                                          Title:  Treasurer


                                       ANNUITY TRUST FOR KATHRYN J. CLARK u/w
                                       STEPHEN C. CLARK, JR. ART 18


                                       By:/s/ Edward W. Stack
                                          ----------------------------
                                          Name:   Edward W. Stack
                                          Title:  Trustee


                                       TRUST FOR MARTIN PERETZ, 1976


                                       By:/s/ Kevin S. Moore
                                          ----------------------------
                                          Name:   Kevin S. Moore
                                          Title:  Trustee


                                       TRUST FOR ANNE L. PERETZ, 1944


                                       By:/s/ Edward W. Stack
                                          ----------------------------
                                          Name:   Edward W. Stack
                                          Title:  Trustee




                                           -14-

<PAGE>



                                       EDMUND S. TWINING III


                                       By:/s/ Kevin S. Moore
                                          ----------------------------
                                          Name:   Kevin S. Moore
                                          Title:  Attorney in Fact


                                       TRUST FOR DOROTHY POTTER BOARDMAN


                                       By:/s/ Edward W. Stack
                                          ----------------------------
                                          Name:   Edward W. Stack
                                          Title:  Trustee


                                       TRUST FOR SUSAN CLARK TWINING, 1946


                                       By:/s/ Edward W. Stack
                                          ----------------------------
                                          Name:   Edward W. Stack
                                          Title:  Trustee


                                       THE SCRIVEN FOUNDATION - M FUND


                                       By:/s/ Kevin S. Moore
                                          ----------------------------
                                          Name:   Kevin S. Moore
                                          Title:  Treasurer


                                       THE MARY IMOGENE BASSETT HOSPITAL-
                                       TRUSTEE FUND


                                       By:/s/ Kevin S. Moore
                                          ----------------------------
                                          Name:   Kevin S. Moore
                                          Title:  Treasurer




                                      -15-

<PAGE>



                                       EVE C. LABOUISSE


                                       By:/s/ Kevin S. Moore
                                          ----------------------------
                                          Name:   Kevin S. Moore
                                          Title:  Attorney in Fact


                                       NEW YORK STATE HISTORICAL
                                       ASSOCIATION - STEPHEN C. CLARK FUND


                                       By:/s/ Kevin S. Moore
                                          ----------------------------
                                          Name:   Kevin S. Moore
                                          Title:  Treasurer


                                       JANE FORBES CLARK


                                       By:/s/ Kevin S. Moore
                                          ----------------------------
                                          Name:   Kevin S. Moore
                                          Title:  Attorney in Fact


                                       TRUST FOR EVGENIA S. PERETZ


                                       By:/s/ Edward W. Stack
                                          ----------------------------
                                          Name:   Edward W. Stack
                                          Title:  Trustee


                                       TRUST FOR JESSE W. PERETZ


                                       By:/s/ Edward W. Stack
                                          ----------------------------
                                          Name:   Edward W. Stack
                                          Title:  Trustee




                                           -16-

<PAGE>



                                       TRUST FOR DAVID L. FARNSWORTH


                                       By:/s/ Edward W. Stack
                                          ----------------------------
                                          Name:   Edward W. Stack
                                          Title:  Trustee


                                       TRUST FOR ANNE E. FARNSWORTH


                                       By:/s/ Edward W. Stack
                                          ----------------------------
                                          Name:   Edward W. Stack
                                          Title:  Trustee


                                       RESIDUARY TRUST FOR JANE FORBES CLARK II


                                       By:/s/ Kevin S. Moore
                                          ----------------------------
                                          Name:   Kevin S. Moore
                                          Title:  Trustee


                                       CLARA WELCH THANKSGIVING HOME, INC.


                                       By:/s/ Richard C. Vanison
                                          ----------------------------
                                          Name:   Richard C. Vanison
                                          Title:  Treasurer


                                       RESIDUARY TRUST u/w SUSAN CLARK TWINING


                                       By:/s/ Jane Forbes Clark
                                          ----------------------------
                                          Name:   Jane Forbes Clark
                                          Title:  Trustee




                                      -17-

<PAGE>



                                       DIANA R. TWINING


                                       By:/s/ Kevin S. Moore
                                          ----------------------------
                                          Name:   Kevin S. Moore
                                          Title:  Attorney in Fact


                                       Capital  Research and Management  Company
                                       on behalf of SMALLCAP World Fund, Inc.


                                       By:/s/ Catherine M. Ward
                                          ----------------------------
                                          Name:   Catherine M. Ward
                                          Title:  Senior Vice President


                                       AEOW 96, LLC


                                       By:/s/  Will K. Weinstein
                                          ----------------------------
                                          Name:   Will K. Weinstein
                                          Title:  Managing Member


                                       STANLEY H. APPEL, M.D.


                                       By:/s/ Stanley H. Appel
                                          ----------------------------


                                       ROBERT P. CUMMINS


                                       By:/s/ Robert P. Cummins
                                          ----------------------------




                                      -18-

<PAGE>



                                       MARILYN LUNNEY


                                       By:/s/ Marilyn Lunney
                                          ----------------------------



                                       WILLIAM H. DUFFELL, JR.


                                       By:/s/ William H. Duffell, Jr.
                                          ----------------------------



                                       IRA FBO ROBERT P. CUMMINS, DLJSC AS
                                       CUSTODIAN


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



                                       ROBERT P. CUMMINS AS CUSTODIAN FOR LINDA
                                       G. CUMMINS UNDER THE TEXAS UNIFORM
                                       TRANSFERS TO MINORS ACT


                                       By:/s/ Robert P. Cummins
                                          ---------------------------- 
                                          Name:   Robert P. Cummins
                                          Title:  Custodian





                                      -19-

<PAGE>



                                    EXHIBIT A

                             Schedule of Purchasers




                                                                      NUMBER OF
                                                                     REGISTRABLE
    NAME AND ADDRESS OF PURCHASER                                     SECURITIES
    -----------------------------                                    -----------
THE FERNLEIGH FOUNDATION                                                16,000
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
THE CLARK FOUNDATION                                                   347,408
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
THE SCRIVEN FOUNDATION                                                  82,000
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
THE MARY IMOGENE BASSETT HOSPITAL 
- - SCC RESEARCH FUND                                                     15,000
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
THE FARMERS' MUSEUM, INC.                                               60,000
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
ANNUITY TRUST FOR KATHRYN J. CLARK u/w STEPHEN C.                       10,000
CLARK, JR. ART. 18
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
TRUST FOR MARTIN PERETZ, 1976                                            6,000
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
TRUST FOR ANNE L. PERETZ, 1944                                          20,000
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005



                                                          -1-

<PAGE>



                                                                      NUMBER OF
                                                                     REGISTRABLE
    NAME AND ADDRESS OF PURCHASER                                     SECURITIES
    -----------------------------                                    -----------
EDMUND S. TWINING III                                                   20,000
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
TRUST FOR DOROTHY POTTER BOARDMAN                                       12,000
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
TRUST FOR SUSAN CLARK TWINING, 1946                                     14,000
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
THE SCRIVEN FOUNDATION - M FUND                                         70,000
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
THE MARY IMOGENE BASSETT HOSPITAL - TRUSTEE FUND                        22,000
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
EVE C. LABOUISSE                                                        30,000
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
NEW YORK STATE HISTORICAL ASSOCIATION - STEPHEN C.                      30,000
CLARK FUND
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
JANE FORBES CLARK                                                       70,000
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
TRUST FOR EVGENIA S. PERETZ                                              4,000
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005



                                       -2-

<PAGE>



                                                                      NUMBER OF
                                                                     REGISTRABLE
    NAME AND ADDRESS OF PURCHASER                                     SECURITIES
    -----------------------------                                    -----------
TRUST FOR JESSE W. PERETZ                                                4,000
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
TRUST FOR DAVID L. FARNSWORTH                                            4,000
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
TRUST FOR ANNE E. FARNSWORTH                                             4,000
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
RESIDUARY TRUST FOR JANE FORBES CLARK II                                35,000
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
CLARA WELCH THANKSGIVING HOME, INC.                                      4,000
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
RESIDUARY TRUST u/w SUSAN CLARK TWINING                                 20,000
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
DIANA R. TWINING                                                         2,000
c/o The Clark Estates
30 Wall Street, 9th Floor
New York, NY 10005
SMALLCAP WORLD FUND, INC.                                              494,000
(Registered in the name of Kane & Co.)
c/o Capital Research & Management Company
Attn:  James P. Ryan
333 South Hope Street
Los Angeles, CA  90071
AEOW 96, LLC                                                            56,339
c/o Genesis Merchant Group
Attn:  Will K. Weinstein
909 Montgomery Street, #600
San Francisco, CA  94133



                                       -3-

<PAGE>



                                                                      NUMBER OF
                                                                     REGISTRABLE
    NAME AND ADDRESS OF PURCHASER                                     SECURITIES
    -----------------------------                                    -----------
STANLEY H. APPEL, M.D.                                                  40,000
c/o Baylor College of Medicine
1 Baylor Place
Houston, TX  77030
ROBERT P. CUMMINS                                                       22,750
c/o Cyberonics, Inc.
17448 Highway 3, Suite 100
Webster, TX  77598
MARILYN LUNNEY                                                           6,000
c/o Cyberonics, Inc.
Attn:  Shawn Lunney
17448 Highway 3, Suite 100
Webster, TX  77598
WILLIAM H. DUFFELL, JR.                                                  1,127
c/o Cyberonics, Inc.
17448 Highway 3, Suite 100
Webster, TX  77598
IRA FBO ROBERT P. CUMMINS,                                               7,750
DLJSC AS CUSTODIAN
c/o Donaldson Lufkin Jenrette
Attn:  ----
- ----
- ----
ROBERT P. CUMMINS AS CUSTODIAN                                           5,000
FOR LINDA G. CUMMINS UNDER THE
TEXAS UNIFORM TRANSFERS TO
MINORS ACT
c/o Cyberonics, Inc.
Attn:  Robert P. Cummins
17448 Highway 3, Suite 100
Webster, TX  77598







                                       -4-

<PAGE>



                          REGISTRATION RIGHTS AGREEMENT

                                CYBERONICS, INC.




                                 March 28, 1997


                                       -1-

<PAGE>


                                TABLE OF CONTENTS

                                                                            Page


 1.       Certain Definitions................................................1

 2.       Notice of Proposed Transfers.......................................2

          2.1         Restriction on Transfer................................2
          2.2         Permitted Transfers....................................3
          2.3         Stockholder Covenant...................................3
          2.4         Restrictive Legend.....................................3

 3.       Registration Rights................................................3

          3.1         Requested Registration.................................3
          3.2         Company Registration...................................5
          3.3         Underwriting...........................................5
          3.4         Expenses of Registration...............................6
          3.5         Registration Procedures................................6
          3.6         Indemnification........................................7
          3.7         Information by Holder.................................10
          3.8         Transfer of Registration Rights.......................10
          3.9         Holdback Agreements...................................10

 4.       Miscellaneous.....................................................11

          4.1         Governing Law.........................................11
          4.2         Successors and Assigns................................11
          4.3         Termination...........................................11
          4.4         Amendment.............................................11
          4.5         Entire Agreement......................................11
          4.6         Notices, etc..........................................11
          4.7         Counterparts..........................................11
          4.8         Severability..........................................12
          4.9         Titles and Subtitles..................................12


                                       -i-

<PAGE>
                                                                      EXHIBIT C
The Clark Estates
c/o Mr. Kevin Moore
Page 1


                                CYBERONICS, INC.







                                       March 28, 1997



The Clark Estates
Attn:  Kevin Moore
30 Wall Street, 9th Floor
New York, NY  10005

         Re:      Designation of Board Member

Dear Kevin:

         By a Common  Stock  Purchase  Agreement  dated the date of this letter,
certain  persons and  entities  whose  business  affairs are managed by or under
common  management  with The Clark Estates (the "Clark Group") are purchasing an
aggregate  of  901,408  shares of the  Common  Stock of  Cyberonics,  Inc.  (the
"Company").  In consideration of such investment,  Cyberonics hereby agrees with
The Clark Estates as follows:

         1. Concurrent with the closing of the securities  purchase  referred to
in the preceding  paragraph,  The Clark  Estates,  on behalf of the Clark Group,
shall  have the right to  designate  one  person  reasonably  acceptable  to the
Company to serve on the Company's Board of Directors. Upon such designation, the
Company  shall  take such  actions  as may be  necessary  to  appoint  The Clark
Estates' designee to the Company's Board of Directors.

         2. For so long as the Clark Group  continues  to own an aggregate of at
least 600,000 of the shares of Common Stock  referred to in the first  paragraph
of this  letter,  the  Company  will  cause one person  designated  by The Clark
Estates to be nominated for election to the Company's Board of Directors at each
meeting of Company stockholders at which directors are being elected.

         3.  If the  person  designated  to  serve  on the  Company's  Board  of
Directors by The Clark  Estates dies or otherwise  becomes  incapacitated  while
serving as a director,  or resigns from the Cyberonics Board, The Clark Estates,
on behalf of the Clark  Group shall have the right to  designate  a  replacement
reasonably acceptable to the Company.  Upon such designation,  the Company shall
take such actions as may be necessary to appoint The Clark Estates'  replacement
designee to the Company's Board of Directors.




<PAGE>


The Clark Estates
c/o Mr. Kevin Moore
Page 2

         4. Failure to exercise the right granted under this letter agreement to
designate a member to serve on the Company's Board of Directors shall not result
in forfeiture of such right.


                                       Very truly yours,

                                       CYBERONICS, INC.



                                       By:/s/ Robert P. Cummins
                                          ----------------------------
                                          Name:  Robert P. Cummins
                                          Title:  Chief Executive Officer





<PAGE>



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