MINNTECH CORP
10-K405, 1996-07-12
SURGICAL & MEDICAL INSTRUMENTS & APPARATUS
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
 
                            ------------------------
 
                                   FORM 10-K
 
/X/ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT
OF 1934
  FOR THE FISCAL YEAR ENDED MARCH 31, 1996 OR
 
/ / Transition report pursuant to Section 13 or 15(d) of the Securities Exchange
Act of 1934
  For the transition period from       to
 
COMMISSION FILE NUMBER 0-11278
 
                              MINNTECH CORPORATION
             (Exact name of registrant as specified in its charter)
 
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  <S>                                  <C>
               MINNESOTA                           41-1229121
    (State or other jurisdiction of      (I.R.S. Employer Identification
    incorporation or organization)                    No.)
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                           14605 - 28TH AVENUE NORTH
                          MINNEAPOLIS, MINNESOTA 55447
                    (Address of principal executive offices)
       Registrant's telephone number, including area code: (6L2) 553-3300
 
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        Securities registered pursuant to Section 12(b) of the Act: NONE
 
          Securities registered pursuant to Section 12(g) of the Act:
 
                     COMMON STOCK, PAR VALUE $.05 PER SHARE
 
                            ------------------------
 
    Indicate  by check  mark whether  the registrant  (1) has  filed all reports
required to be filed by  Section 13 or 15(d) of  the Securities Exchange Act  of
1934  during  the preceding  12  months (or  for  such shorter  period  that the
registrant was required to file such reports), and (2) has been subject to  such
filing requirements for the past 90 days. Yes _X_ No ___
 
    Indicate  by check mark if disclosure  of delinquent filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's  knowledge, in definitive  proxy or information  statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. _X_
 
    As  of June 28, 1996,  6,653,214 shares of Common  Stock, par value $.05 per
share, were outstanding, and the aggregate market value of the shares of  Common
Stock  (based upon the closing transaction price on such date as reported on the
NASDAQ National  Market System)  held by  non-affiliates of  the registrant  was
approximately $55,912,323.
 
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                      DOCUMENTS INCORPORATED BY REFERENCE
 
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                  DOCUMENTS INCORPORATED BY REFERENCE                    10-K PART AND ITEM WHERE INCORPORATED
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1. Certain portions of the Definitive Proxy Statement for the Annual     Part III: Items 10, 11, 12 and 13
   Meeting of Shareholders of the Registrant to be held August 28, 1996
</TABLE>
 
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                                     PART I
 
ITEM 1.  BUSINESS
 
GENERAL DEVELOPMENT OF THE BUSINESS
 
    Minntech  Corporation (the "Company")  was incorporated on  January 30, 1974
under the  laws  of  Minnesota.  The Company  is  engaged  in  the  development,
manufacturing  and  marketing of  medical supplies  and devices,  sterilants and
water filtration products. The Company's  products are used primarily in  kidney
dialysis  and in open-heart surgery. The trade name of Renal Systems is used for
products sold in the  dialysis market, the  trade name of  Minntech is used  for
products  sold in the  cardiosurgery market, and  the trade name  of Fibercor is
used for marketing water filtration products. The Company has core  technologies
in  electronics, fibers,  plastics, and  chemical solutions,  all of  which were
internally developed.
 
INDUSTRY SEGMENTS
 
    Through March 31, 1996,  the Company has been  engaged in a single  industry
segment  -- medical  devices and supplies.  The Company  also markets filtration
devices for industrial water purification applications. Through March 31,  1996,
sales revenues from such filtration devices have not been material.
 
PRODUCTS
 
    The Company has four interrelated product groups:
 
    - Dialysis Supplies and Devices
    - Reprocessing Products
    - Cardiosurgery Products
    - Water Filtration Products
 
    DIALYSIS SUPPLIES AND DEVICES
 
    The Company's main dialysis supply product is a line of concentrates used by
kidney   centers  to  prepare  dialysate  (a  salt  solution)  for  hemodialysis
treatments. The  Company provides  the industry's  most complete  line of  these
concentrates  in both liquid and powder forms  for use in virtually all types of
kidney dialysis machines. Sales of concentrate products accounted for more  than
70% of all sales in this product group in each of the past three fiscal years.
 
    The Company in fiscal 1992 introduced its first dialyzer (artificial kidney)
- --  the Renaflo-Registered  Trademark- HDF  1350 dialyzer.  In fiscal  1993, the
Company introduced the  Primus-Registered Trademark- line  of second  generation
dialyzers  in Europe. In August 1994,  the Company received FDA market clearance
to sell the Primus-Registered  Trademark- dialyzer in  the United States.  These
dialyzer  products  contain  the  Company's  proprietary  high  flux polysulfone
membrane, and the Company is one of only three manufacturers of such polysulfone
devices in the  world. High flux  dialyzers allow for  more rapid dialysis,  are
capable  of shortening patient  treatment time, and are  less traumatic to blood
than dialyzers containing traditional membranes.  Dialyzers are the single  most
expensive  supply  item used  in hemodialysis  treatments. The  worldwide annual
market for high flux  types of dialyzers is  estimated to be approximately  $180
million.  (Market size is based on  published information on patient populations
and the Company's estimate of the  percentage of treatments performed with  high
flux  dialyzers.) The Company's market share at March 31, 1996 was approximately
one percent.
 
    The Company's major dialysis electronic products are the Sonalarm-Registered
Trademark-  Foam  Detector,  a   device  that  detects   air  in  blood   during
hemodialysis,  the Minipump-TM-  Hemodialysis Blood Pump  which circulates blood
during hemodialysis,  and a  peritoneal dialysis  pump. The  Sonalarm-Registered
Trademark-  and the Minipump-TM- are sold to  end users and in component form to
other manufacturers of blood processing  equipment. The peritoneal pump is  sold
as an OEM component to another manufacturer.
 
    These  dialysis products accounted for approximately  29% of sales in fiscal
1996, 33% of sales in fiscal 1995 and 34% of sales in fiscal 1994.
 
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    REPROCESSING PRODUCTS
 
    Reprocessing products  include the  Renatron-Registered Trademark-  Dialyzer
Reprocessing   System  and  associated   supplies  including  Renalin-Registered
Trademark-, a cold  sterilant solution which  replaces formaldehyde in  dialyzer
reprocessing,  and Actril-Registered Trademark- Cold Sterilant, a kidney machine
disinfectant.
 
    In response  to government-mandated  cost  containment measures,  many  U.S.
dialysis  centers in the late 1970s began reusing dialyzers (artificial kidneys)
instead of discarding them after a  single use. In 1982, the Company  introduced
the  Renatron-Registered Trademark-, a machine that provides an automated method
of rinsing, cleaning, testing, and sterilizing dialyzers for multiple reuse.  In
1985  dialysis centers  began using Renalin-Registered  Trademark- sterilant for
manual reprocessing  of dialyzers.  In  1990, the  Company  began sales  of  the
Renatron-Registered  Trademark- II, a  second generation system  that includes a
bar  code  reader,  computer   and  Renalog-Registered  Trademark-software   for
automated  record keeping and analysis. Recent  data released by the Centers for
Disease Control ("CDC") indicate that, as of 1993, 79% of all U.S.  hemodialysis
patients  were treated  in centers that  reuse dialyzers. The  CDC also reported
that 73% of all dialysis centers in the United States reuse dialyzers and 51% of
these centers used Renalin-Registered  Trademark- to sterilize their  dialyzers.
The  other  dialysis  centers  used  primarily  formaldehyde  or  glutaraldehyde
disinfectants to reprocess dialyzers.
 
    The Company believes its Renatron-Registered Trademark- system is faster and
easier to use than competitive automated systems. The Company also believes that
the Renatron-Registered Trademark- system is the top selling automated  dialyzer
reprocessing  system  in  the world.  At  March  31, 1996,  the  Company  had an
installed customer  base  of  more  than  2,500  Renatron-Registered  Trademark-
systems.
 
    During  fiscal  1994,  the Company  completed  the purchase  of  a sterilant
product line from a German firm as part of its strategy of geographic  expansion
of its reprocessing business. Unlike the United States market, dialyzer reuse is
in  the formative stages  in Europe. The Company  has increased its reprocessing
product sales  in Europe  by  employing direct  salespersons in  major  dialysis
markets and promoting the advantages of reuse.
 
    In  September 1994, the  Company purchased an  endoscope reprocessor product
line from Bard Interventional Products, a  division of C.R. Bard, Inc.  ("Bard")
for  $934,000 in  cash. Manufacturing of  the products was  assimilated into the
Company's electronic  device production  facility  in Plymouth,  Minnesota.  The
endoscope  reprocessing machine  provides high  level disinfection  for flexible
endoscopes and is marketed to gastroenterology units of hospitals and ambulatory
care units.
 
    The Company began sales of the Cathetron-Registered Trademark-  Reprocessing
System  in  Europe in  April 1994.  The Cathetron-Registered  Trademark- System,
along with its companion cold sterilant CATHx-Registered Trademark-, provides an
automated method  of  cleaning  and  sterilizing  cardiovascular  catheters  for
subsequent reuse. At March 31, 1996, the Company remained in the early stages of
marketing the Cathetron-Registered Trademark- System in Europe and certain other
international  markets. A changing regulatory  environment in Europe is limiting
the ability  to sell  a  device to  reprocess  an angioplasty  catheter  labeled
"single  use only."  In order  to address this  concern, the  Company intends to
market with the Cathetron-Registered Trademark- a catheter labeled for "multiple
use." The Company expects to have  this catheter available in fiscal year  1997.
The  Company plans to submit an  Investigational Device Exemption application to
the FDA in fiscal 1997  so that clinical trials can  be conducted in the  United
States.
 
    Reprocessing  products accounted  for approximately  34% of  sales in fiscal
1996, 32% of sales in fiscal 1995, and 28% of sales in fiscal 1994.
 
    CARDIOSURGERY PRODUCTS
 
    The primary products  in this  group at March  31, 1996  consisted of  three
hollow fiber devices.
 
    OXYGENATORS
 
    Since  1987, the Company has manufactured a hollow-fiber membrane oxygenator
for  use  in  open-heart  surgery.  The  device  contains  a  highly  efficient,
integrated  heat exchanger, and the Company believes that the unit is capable of
transferring more oxygen than competitive products. Since 1987, the Company  has
manufactured  the oxygenator for exclusive worldwide distribution pursuant to an
 
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agreement with Bard under  the terms of the  agreement, Bard agreed to  purchase
certain  minimum quantities of  the oxygenator through  December 31, 1995. These
minimum quantities had an annual sales value to the Company of approximately $10
million, and  Bard's  annual purchases  through  March 31,  1995  exceeded  such
minimums.
 
    In  April 1995, Bard  and the Company  entered into a  new agreement for the
sale  of  the  oxygenator  whereby  Bard  agreed  to  purchase  certain  minimum
quantities  of the  oxygenator through  March 31,  1997, but  the agreement also
allows Bard to continue purchasing the oxygenator through June 30, 1997, without
any minimum purchase  obligation. Bard will  have exclusive distribution  rights
through  March  31,  1997  and nonexclusive  rights  thereafter.  Bard's minimum
purchase obligation under the  agreement for the period  April 1, 1995 to  March
31,  1997 has  a sales value  to the  Company of approximately  $20 million. The
agreement restricts  Bard from  selling any  other oxygenator  until January  1,
1997,  but permits the Company to begin worldwide sales of its second generation
oxygenator  whenever  it  becomes   commercially  available.  See   "Significant
Customers."
 
    The Company has developed the Borcor-TM- 200, a second generation oxygenator
that requires less priming volume while improving the performance over its first
product.  The device  incorporates the Company's  proprietary weaving technology
for the  membrane oxygenation  compartment and  heat exchange  compartment.  The
product  was introduced in Europe in November 1995, and the Company is currently
awaiting FDA clearance of a 510(k) application submitted in August 1995.
 
    HEMOCONCENTRATORS
 
    Since 1985,  the  Company has  manufactured  and sold  hemoconcentrators,  a
filtration  device that removes excess body fluids during open-heart surgery. In
1988,  the  Company  introduced  a   second  generation  product,  the   Hemocor
Plus-Registered Trademark- hemoconcentrator, a rinse-free device that allows for
faster  set-up during surgery. In February 1994, the Company received FDA market
clearance for a third generation product, the Hemocor HPH-Registered  Trademark-
line  which contains  a higher  performance hollow  fiber membrane.  The Company
estimates that  hemoconcentration is  currently used  in 25%  of all  open-heart
procedures  in the United States and to a lesser extent internationally and that
such  procedures  require  up  to  125,000  hemoconcentrator  devices   annually
worldwide.  At March  31, 1996, the  Company held more  than a 70%  share of the
United States hemoconcentrator market.
 
    HEMOFILTERS
 
    The Renaflo-Registered  Trademark-  Hemofilter,  introduced in  1985,  is  a
device   that  performs  continuous   arteriovenous  hemofiltration  (CAVH),  an
intensive care therapy  that treats acute  renal failure and  fluid overload  in
critically  ill patients.  CAVH is an  alternative to  conventional dialysis for
these patients.
 
    In  April   1995,   the   Company   completed   the   acquisition   of   the
hemoconcentrator,  hemofilter  and dialysate  filter  product lines  from Amicon
Ireland Ltd, an indirect subsidiary of W.R. Grace & Co. ("Amicon"). The purchase
price was approximately $1.4  million, paid in cash.  The Company also signed  a
six-month  supply agreement with Amicon whereby Amicon manufactured products for
the Company to be sold in Europe. The Company began manufacturing these products
in its Minneapolis facility in the first quarter of fiscal 1997.
 
    Cardiosurgery products accounted  for approximately 34%  of sales in  fiscal
1996, 33% of sales in fiscal 1995, and 37% of sales in fiscal 1994.
 
    WATER FILTRATION PRODUCTS
 
    There  are two major products  in this group: Fiberflo-Registered Trademark-
Microfilters and Minncare-Registered Trademark- Disinfectant. The
Fiberflo-Registered Trademark- Microfilter  is a  hollow fiber  filter that  has
"point-of-use"  applications in industrial water purification. These filters are
being used  for finer  filtration  in the  pharmaceutical, medical  device,  and
biotechnology industries. Minncare-Registered Trademark- Disinfectant is used to
disinfect  water  treatment systems.  Through March  31, 1996,  water filtration
products sales revenues have not been material, accounting for 2.5% of sales  in
fiscal 1996, 2.2% of sales in fiscal 1995, and 1.1% of sales in fiscal 1994.
 
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MARKETS AND DISTRIBUTION
 
    The  Company sells  its medical products  in the United  States primarily to
hospitals, clinics,  and kidney  treatment centers.  The Company  markets  these
products   in  the  United  States  through  direct  sales  forces  and  through
independent stocking distributors.  At March  31, 1995, the  Company employed  a
total  of  seven  dialysis  sales  representatives  in  the  United  States, two
cardiosurgery sales representatives, two water filtration sales representatives,
and one  endoscope reprocessor  sales representative.  In addition,  a  customer
service  staff and a  technical services department  support field activity. The
Company also operates its  own trucks to expedite  delivery of certain  products
and minimize shipping costs.
 
    Until   1991,   the   Company  had   historically   marketed   its  products
internationally through independent distributors. Starting in 1991, the  Company
began establishing direct sales operations in Europe to enhance marketing of its
products.  The  Company's goal  is to  increase its  revenues in  Europe through
expanded direct sales activities. The Company established a headquarters for its
European operations in the Netherlands in April 1995 and employed a total of  14
people in Europe at March 31, 1996.
 
    The  Company's  dialysis marketing  programs  are directed  at nephrologists
(doctors who specialize in treating kidney disease), nurses, hospital and clinic
administrators, and  others who  influence purchasing  decisions.  Cardiosurgery
marketing  programs  are  directed  at  perfusionists  (technicians  who operate
heart-lung bypass equipment) and  cardiovascular surgeons. The Company  supports
its   field  organization  and  network  of  distributors  through  advertising,
distribution of sales  materials, publication of  articles in medical  journals,
and attendance at medical conferences.
 
SOURCES AND AVAILABILITY OF MATERIALS
 
    The  majority of the materials  and components that the  Company uses in its
manufacturing operations are readily obtainable from multiple sources worldwide.
In addition, the Company constructs many  of its injection molds and also  molds
and extrudes many of its component plastic parts.
 
PATENTS AND TRADEMARKS
 
    The  Company holds  rights under  125 patents  worldwide (including  34 U.S.
patents) covering its  products or components  thereof. At March  31, 1996,  the
Company also had a total of 100 pending patent applications in the United States
and  in foreign  countries. The  Company also  holds rights  under 163 trademark
registrations worldwide and has 61 applications pending.
 
    The Company  believes that  patent  protection is  a significant  factor  in
maintaining  its market position  but the rapid changes  of technology in kidney
dialysis therapy,  cardiosurgery,  and the  other  areas in  which  the  Company
competes may limit the value of the Company's existing patents.
 
    While  patents have a presumption of validity under the law, the issuance of
a patent is not conclusive  as to its validity or  the enforceable scope of  its
claims.  Accordingly,  there can  be no  assurance  that the  Company's existing
patents will afford protection against  competitors with similar inventions  nor
can  there be any  assurance that the  Company's patents will  not be infringed.
Competitors also may obtain  patents that the Company  would need to license  or
design  around. These  factors also  tend to  limit the  value of  the Company's
existing patents. Consequently, in certain  instances, the Company may  consider
trade  secret  protection  to be  a  more  effective method  of  maintaining its
proprietary positions.
 
SEASONALITY OF THE BUSINESS
 
    The Company's business is not seasonal.
 
WORKING CAPITAL AND BACKLOG
 
    The Company's  credit  practices  and  related  working  capital  needs  are
comparable  to  those of  other  companies in  the  medical device  and supplies
industry. The Company generally fills orders
 
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within 30 days of receipt. No material order backlogs existed at March 31, 1996.
An order backlog existed for  hemoconcentrators, dialyzers and water filters  at
March 31, 1995. This backlog had an estimated aggregate sales value of $600,000,
and the Company filled these orders in fiscal 1996.
 
SIGNIFICANT CUSTOMERS
 
    The   Company's  five  largest  customers   in  fiscal  1996  accounted  for
approximately 36% of total sales. Sales of oxygenators to Bard accounted for 20%
or more of sales in fiscal years  1996, 1995, and 1994. Bard agreed to  purchase
certain  minimum quantities  of the  oxygenator under  a contract  that began in
fiscal 1988 and was scheduled to terminate  December 31, 1995. In April 1995,  a
new  agreement was reached extending the term to June 30, 1997. The loss of Bard
as a customer  would likely have  a material adverse  effect upon the  Company's
business  if the Company was unable  to successfully market its second generator
oxygenator itself or to arrange for  other means of distribution. See  "Products
- -- Cardiosurgery Products -- Oxygenators."
 
RENEGOTIATION OR TERMINATION OF GOVERNMENT CONTRACTS
 
    No material portion of the Company's business is subject to renegotiation of
profits  or  termination of  contracts or  subcontracts at  the election  of the
Government.
 
COMPETITION AND MARKET CONDITIONS
 
    The Company's  dialysis  and reprocessing  products  are sold  in  a  highly
competitive market, and the Company competes with many other firms. The dialysis
market  is dominated  by a few  firms including Baxter  International, Gambro AB
(CGH Medical), W.R. Grace & Co. (National Medical Care), and Fresenius AG. These
firms have  substantially greater  financial and  personnel resources  than  the
Company  and most of them produce and sell a more comprehensive line of dialysis
equipment  and  supplies.  The  Company   also  faces  competition  from   other
international  companies and several smaller companies that carry a limited line
of products.
 
    The Company's first  generation membrane oxygenator  is sold exclusively  by
Bard  Cardiopulmonary Division of Bard.  Bard's major competitors are Medtronic,
Inc., CGH Medical,  Bentley Laboratories,  Inc., Terumo  Corporation and  Avecor
Cardiovascular,   Inc.  The   Company's  new   Borcor-TM-  oxygenator   is  sold
internationally  by  a  network  of  independent  distributors.  The   Company's
hemoconcentrators  are sold by  its own direct  sales force and  by a network of
independent medical distributors. The major competitors in the  hemoconcentrator
market are CGH Medical, Bentley Laboratories, Inc. and Research Industries.
 
    The   health  care  industry  in  the  United  States  operates  under  cost
containment pressures imposed by the  federal government, employers, and  health
insurance  carriers.  One major  influence is  the Medicare  Prospective Payment
System, implemented in 1983, which provides for fixed payments to hospitals  for
care of Medicare patients based on diagnosis rather than actual hospital charges
(the DRG system). In addition, the Company's end user customers for its dialysis
and  reprocessing products  are subject  to fixed  payments per  treatment under
separate Medicare regulations which have been in place for more than 20 years.
 
    Health care providers,  in general,  have responded  by shortening  hospital
stays  through quicker clinical diagnoses and by employing less invasive medical
procedures and more efficient therapies. In addition, hospitals and other health
care providers have  sought to  lower their  costs by  reducing their  purchased
supplies  costs and by improving their  utilization of facilities and equipment.
Dialysis centers, in particular, have also responded by reprocessing and reusing
dialyzers and other supplies and by shortening treatment times.
 
    Under the current cost containment  environment, the competitive factors  in
the  medical markets  served by the  Company are  such that cost  reduction is a
prime consideration. Although cost containment may adversely affect some of  the
Company's  supply products, cost containment pressures  may be a positive factor
for certain  of  the  Company's  products  such  as  its  dialyzer  reprocessing
products,    hemoconcentrators,   and    the   Cathetron-Registered   Trademark-
Reprocessing System.
 
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RESEARCH AND PRODUCT DEVELOPMENT
 
    The Company strives to design and develop technologically advanced  products
that  are cost effective and,  in the case of  its medical products, improve the
quality of patient care. The Company emphasizes product development rather  than
basic  research. The ability of the  Company to compete effectively depends upon
its ability  to  anticipate  changing  market  needs  and  successfully  develop
products to meet those needs.
 
    As of March 31, 1996, 21 of the Company's employees were engaged in research
and  development. In addition  to its own research  activities, the Company from
time  to  time   obtains  experimental  and   clinical  research  from   outside
investigators, consultants and institutions.
 
    Over  the past three years the Company has expended a total of $9,149,000 in
research and development as follows: fiscal  1994 -- $2,893,000, fiscal 1995  --
$3,133,000  and fiscal 1996 -- $3,123,000. Such costs represented 6.1%, 5.6% and
4.8% of revenues, respectively, in each such period.
 
    The Company's current research and  development efforts are directed  toward
reprocessing  applications, blood filtration  and oxygenation technologies, cold
sterilant/disinfection applications and water filtration.
 
GOVERNMENT REGULATION
 
    The medical products manufactured and marketed by the Company are subject to
the Federal Food,  Drug and Cosmetic  Act and the  Medical Device Amendments  of
1976   (collectively,  the   "FDCA").  These  laws   give  the   Food  and  Drug
Administration ("FDA")  extensive  regulatory authority  over  medical  products
developed,  manufactured or  marketed by the  Company in the  United States. The
FDCA requires  the Company  to register  with the  FDA, provide  updated  device
listings  and submit a premarket notification to  FDA when (i) a device is being
introduced into the  market for the  first time; (ii)  the manufacturer makes  a
significant  change or  modification to  an already  marketed device  that could
affect safety or effectiveness; or (iii) there is a major change or modification
in the intended  use of  the device.  The FDCA  also requires  that the  Company
submit  a premarket approval application for devices that are life supporting or
sustaining, or present a  potential unreasonable risk of  injury or illness.  In
addition,  the  FDCA subjects  the Company  to  the Good  Manufacturing Practice
regulations under which  the FDA  conducts periodic  unannounced inspections  to
verify  compliance.  Further, the  FDCA  imposes certain  requirements regarding
manufacturing  procedures,  distribution,  advertising,  labeling,  and   record
keeping.  The FDA  also has  the power to  order suspension  of manufacturing or
marketing or to recall products that are not in compliance with law.
 
    Before introducing its  products into  the market, the  Company must  comply
with  the premarket  approval and/or notification  provisions of  the FDCA. Data
regarding the product's safety and effectiveness  must be submitted to the  FDA.
In some instances, clinical studies may be necessary to obtain this data. Before
commencing clinical trials, the Company must apply for an Investigational Device
Exemption  ("IDE"). Under an approved  IDE, a device is  exempt from certain FDA
provisions including  misbranding,  registration, listing,  premarket  approval,
records  and  reports  and  good  manufacturing  practices,  thus  enabling  the
applicant company  to  test a  device  clinically.  Before an  IDE  is  granted,
sufficient  nonclinical data must be submitted to demonstrate that the device is
safe and effective.  Significant time  and expense  may be  associated with  the
collection  of both clinical  and nonclinical data and  there are no assurances,
that the necessary FDA premarket approvals or clearances will be granted.
 
    During 1992  and 1993,  the time  between submission  to the  FDA and  final
clearance  for marketing increased  substantially; however, review  times by the
FDA are beginning  to decrease.  Notwithstanding, there are  no assurances  that
this  trend  will continue,  and  the Company  is  still experiencing  delays in
receiving product clearances.
 
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    In January  1995,  the  Company  received ISO  9001  certification  for  its
Minneapolis  facilities. This  certification allows the  Company to self-certify
its  products  for  sale  throughout   the  European  Community.  In  order   to
self-certify,  the Company  must maintain  certain records  and files  which are
reviewed by  a "notified  body" organization  on an  annual basis.  Many of  the
Company's products now display the CE mark.
 
    Certain  products of the  Company are also subject  to registration with the
Environmental  Protection  Agency  (EPA).  The  registration  process  generally
entails  the collection  and submission of  data to support  the products' label
claims. Considerable time and cost may  be involved with the collection of  data
to support these submissions, and there are no assurances that the necessary EPA
approvals will be granted for the Company's new products. Currently, EPA and FDA
have  entered into a memorandum of  understanding whereby the agencies intend to
cooperate on chemical  product submissions  that are  currently duplicative  for
both applicants and the agencies.
 
    Compliance   with  federal,  state,  and  local  provisions  regulating  the
discharge of  materials  into the  environment,  or otherwise  relating  to  the
protection  of the environment, do  not have a material  adverse effect upon the
capital expenditures, earnings, and competitive position of the Company.
 
EMPLOYEES
 
    As of March 31,  1996, the Company employed  17 part-time and 434  full-time
employees,  including  334  persons  in manufacturing  operations.  None  of the
employees is  covered by  a  collective bargaining  agreement, and  the  Company
believes its employee relations are good.
 
GEOGRAPHIC AREA INFORMATION
 
    The  major foreign markets for the Company's products are Europe and the Far
East. Sales outside the United States for  the years ended March 31, 1994,  1995
and   1996   were   approximately  $4,586,000,   $7,261,000,   and  $10,462,000,
respectively. Sales outside the United  States accounted for approximately  10%,
13% and 16% of total sales, respectively, in each such period.
 
                      EXECUTIVE OFFICERS OF THE REGISTRANT
 
    The  executive officers of the Company, their ages, and the year they became
executive officers are listed below:
 
<TABLE>
<CAPTION>
                                                                                                           FIRST ELECTED
           NAME                                      POSITION WITH COMPANY                           AGE    AS OFFICER
- ---------------------------  ----------------------------------------------------------------------  ---   -------------
<S>                          <C>                                                                     <C>   <C>
Louis C. Cosentino, Ph.D.    President, Chief Executive Officer and Director                         52        1974
LeRoy J. Fischbach           Vice President -- Regulatory Affairs                                    52        1980
Thomas J. McGoldrick         Executive Vice President                                                55        1985
Daniel H. Schyma             Vice President -- International                                         54        1992
Douglas A. Luehmann          Vice President -- Dialysis                                              53        1993
Richard P. Goldhaber         Vice President -- Technology                                            52        1993
Barbara A. Wrigley           Vice President, General Counsel and Secretary                           45        1994
Robert W. Johnson            Vice President -- Quality Assurance                                     40        1994
Luis J. Berga                Vice President, Manufacturing -- Cardiovascular                         43        1995
Warren M. White              Chief Financial Officer                                                 54        1995
</TABLE>
 
                                       7
<PAGE>
    Executive officers are elected annually by the Board of Directors and  serve
until  their successors are duly elected and qualified. Dr. Cosentino and Mssrs.
Fischbach, McGoldrick, Schyma and Luehmann have been employed by the Company  in
an executive or management capacity for more than five years.
 
    Mr.  Goldhaber joined the  Company in November  1993, having previously been
employed  by  Baxter  Healthcare  Corporation  from  1965  to  1993  in  various
manufacturing  and engineering capacities including  Vice President, New Product
Development for Baxter's European operations.
 
    Ms. Wrigley joined  the Company  in September 1991,  having previously  been
associated  with the Minneapolis law firm of  Dorsey & Whitney from 1989 to 1991
and the Cleveland-based firm of Jones, Day, Reavis & Pogue during 1991. While in
private practice, Ms. Wrigley specialized in the areas of intellectual  property
and general corporate law.
 
    Mr. Berga joined the Company in August 1995, having previously been employed
from  1986 to 1995 by Baxter Healthcare Corporation in various manufacturing and
operations capacities, including most recently Vice President, Operations.
 
    Mr. White  joined  the Company  in  December 1995,  having  previously  been
employed from 1983 to 1995 by Dotronix, Inc. as Vice President Finance.
 
ITEM 2.  PROPERTIES
 
    UNITED STATES
 
    The  Company owns  two facilities  located on  adjacent sites,  comprising a
total of 14 acres of land in  Plymouth, a suburb of Minneapolis, Minnesota.  One
facility  is a 65,000 square-foot building,  occupied by the Company since 1977,
which is used for manufacturing and warehousing operations. The second  facility
is  a 110,000 square-foot building, purchased in 1990, that houses the Company's
executive, administrative  and  sales  staffs,  and  research  operations.  This
building is also used for manufacturing and warehousing.
 
    The  Company also  owns two  parcels of  undeveloped land  adjacent to these
facilities comprising a total of 7.8 acres.
 
    EUROPE
 
    The Company  owns  a 21,000  square-foot  building on  a  4.4 acre  site  in
Heerlen, The Netherlands. Occupancy commenced in April 1995. The facility serves
as  the Company's  European headquarters  and is being  used as  a sales office,
warehouse and manufacturing facility.
 
    The Company believes its  facilities are in  good condition, being  utilized
for their intended purposes, and have sufficient capacity to meet its reasonably
anticipated needs.
 
ITEM 3.  LEGAL PROCEEDINGS
 
    The  Company is  not aware  of any  pending or  threatened legal proceedings
which it regards as likely to have a material adverse effect on its business.
 
ITEM 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS
 
    There were no  matters submitted to  a vote of  security holders during  the
fourth quarter of the fiscal year ended March 31, 1996.
 
                                       8
<PAGE>
                                    PART II
 
ITEM 5.  MARKET FOR REGISTRANT'S COMMON STOCK AND RELATED
       STOCKHOLDER MATTERS
 
    The  Company's common stock  is traded on the  NASDAQ National Market System
under the  symbol "MNTX."  The prices  below are  the high  and low  transaction
prices as reported in each quarter of the last two fiscal years.
 
<TABLE>
<CAPTION>
                                                                        YEARS ENDED MARCH 31
                                                                ------------------------------------
                                                                      1996                1995
FISCAL                                                          ----------------    ----------------
QUARTER PRICES                                                   HIGH      LOW       HIGH      LOW
- ------------------------------------------------------------    ------    ------    ------    ------
<S>                                                             <C>       <C>       <C>       <C>
First Quarter...............................................    $15.50    $11.50    $12.50    $10.50
Second Quarter..............................................     19.25     13.75     16.50     11.50
Third Quarter...............................................     23.63     16.00     16.00     12.25
Fourth Quarter..............................................     22.50     17.00     16.50     14.50
</TABLE>
 
    As  of  June 28,  1996, the  Company had  approximately 510  shareholders of
record.
 
    The Company paid annual cash dividends of ten cents per share on its  common
stock in September 1994 and September 1995. The Board of Directors will consider
annually  the  payment of  dividends. However,  any  future determination  as to
payment of cash dividends will depend  upon the financial condition and  results
of  operations of the Company and such other factors that are deemed relevant by
the Board of Directors.
 
                                       9
<PAGE>
ITEM 6.  SELECTED FINANCIAL DATA
 
FIVE-YEAR SUMMARY OF SELECTED FINANCIAL DATA
 
<TABLE>
<CAPTION>
                                                                                   YEARS ENDED MARCH 31,
                                                              ---------------------------------------------------------------
                                                                 1996         1995         1994         1993         1992
                                                              -----------  -----------  -----------  -----------  -----------
<S>                                                           <C>          <C>          <C>          <C>          <C>
STATEMENTS OF EARNINGS DATA
Net sales -- products.......................................  $64,769,143  $55,882,512  $47,487,981  $44,016,645  $34,793,390
Contract revenues...........................................      --           300,000      300,000      300,000      100,000
                                                              -----------  -----------  -----------  -----------  -----------
Total revenues..............................................   64,769,143   56,182,512   47,787,981   44,316,645   34,893,390
Cost of product sales.......................................   38,108,313   31,774,240   26,620,243   24,799,821   19,709,208
Research and development expenses...........................    3,123,065    3,133,075    2,892,514    2,404,838    2,099,375
Selling, general and administrative expenses................   15,319,533   11,939,902   10,053,196    9,552,534    7,013,315
Amortization of intangible assets...........................      762,552      358,068      197,578      141,473      105,573
Loss due to fiber production scale-up.......................      936,000      --           --           --           --
                                                              -----------  -----------  -----------  -----------  -----------
Earnings from operations....................................    6,519,680    8,977,227    8,024,450    7,417,979    5,965,919
Other income (expense), net.................................       42,535      236,630      (44,345)     115,181      (11,519)
                                                              -----------  -----------  -----------  -----------  -----------
Earnings before income taxes................................    6,562,215    9,213,857    7,980,105    7,533,160    5,954,400
Provision for income taxes..................................    2,394,000    3,294,000    3,045,000    2,814,000    2,128,000
Minority interest...........................................     (140,024)     --           --           --           --
                                                              -----------  -----------  -----------  -----------  -----------
Net earnings................................................  $ 4,308,239  $ 5,919,857  $ 4,935,105  $ 4,719,160  $ 3,826,400
                                                              -----------  -----------  -----------  -----------  -----------
                                                              -----------  -----------  -----------  -----------  -----------
Net earnings per share......................................  $       .62  $       .90  $       .78  $       .72  $       .58
Weighted average common and common equivalent shares........    6,923,821    6,613,391    6,354,348    6,524,277    6,630,797
BALANCE SHEET DATA
Cash, cash equivalents and marketable securities............  $ 5,218,727  $ 4,487,345  $ 7,698,787  $ 6,249,516  $ 7,120,991
Working capital.............................................   22,128,080   18,105,889   17,874,988   13,653,062   11,239,365
Property and equipment, net.................................   17,323,495   15,631,510   12,899,800   12,039,244   10,909,692
Total assets................................................   50,046,500   41,273,591   36,029,630   31,352,470   27,943,534
Long-term debt..............................................      --           --         1,905,920    1,942,577    1,961,966
Stockholders' equity........................................   41,210,272   35,052,404   28,704,406   23,066,499   19,131,053
Book value per common share.................................  $      6.21  $      5.49  $      4.66  $      3.80  $      3.26
GENERAL DATA AND RATIOS
Current ratio...............................................         4.17         4.56         5.36         3.71         3.08
Gross margin on net product sales...........................         41.2%        43.1%        43.9%        43.7%        43.4%
Net earnings as a % of total revenues.......................          6.7%        10.5%        10.3%        10.6%        11.0%
Return on average stockholders' equity......................         11.3%        18.6%        19.1%        22.4%        22.9%
</TABLE>
 
                                       10
<PAGE>
ITEM 7.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
CONDITION AND RESULTS OF OPERATIONS
 
RESULTS OF OPERATIONS
 
    REVENUES
 
    Revenues  in fiscal year 1996 increased by $8,587,000, or 15%, due primarily
to increased  unit sales  of dialyzer  reprocessing and  endoscope  reprocessing
products  and increased sales of  cardiosurgery products. Sales of cardiosurgery
products  grew  22%  due  to  increased  unit  sales  of  hemoconcentrators  and
hemofilters  which more than offset a small decline in oxygenator sales. Product
lines acquired in the first quarter of the fiscal year contributed to the growth
of cardiosurgery product sales. Product price increases in fiscal year 1996  did
not have a significant impact on revenues.
 
    Sales  of  membrane oxygenators  to Bard  accounted for  20% of  revenues in
fiscal year 1996 compared to 25%  in fiscal 1995. The Company's supply  contract
with  Bard expires on June  30, 1997. Sales of  oxygenators under this agreement
are scheduled to  decrease substantially  in fiscal  year 1997.  The decline  in
sales  to Bard  is expected to  be offset  to a certain  extent by  sales of the
Company's second  generation oxygenator  -- the  Biocor-TM- 200.  Sales of  this
product  commenced in Europe in the third  quarter of fiscal year 1996. At March
31, 1996,  the Company  was awaiting  FDA market  clearance to  sell its  Biocor
oxygenator in the United States.
 
    Revenues  in  fiscal  year 1995  increased  by  $8,395,000, or  18%,  due to
increased unit sales of all major product lines except for sales of  oxygenators
to Bard which remained approximately constant with the prior year. Product price
increases in fiscal year 1995 accounted for approximately 10% of the increase in
revenue dollars.
 
    Changes in foreign currency exchange rates did not have a significant impact
on the Company's revenues in fiscal years 1996, 1995 and 1994.
 
    Product  sales have  grown at a  compound annual  rate of 14%  over the past
three years. The following table indicates sales and percent of total  corporate
sales by product group for each of the last three fiscal years:
 
<TABLE>
<CAPTION>
                                                                         1996                1995                1994
                                                                   -----------------   -----------------   -----------------
<S>                                                                <C>          <C>    <C>          <C>    <C>          <C>
Dialysis supplies and devices....................................  $18,648,000   29%   $18,552,000   33%   $16,223,000   34%
Reprocessing products............................................   22,220,000   34     17,816,000   32     13,127,000   28
Cardiosurgery products...........................................   22,298,000   34     18,263,000   33     17,637,000   37
Water filtration products........................................   1,603,0003    3      1,252,000    2        501,000    1
                                                                   -----------  ----   -----------  ----   -----------  ----
                                                                   $64,769,000  100%   $55,883,000  100%   $47,488,000  100%
                                                                   -----------  ----   -----------  ----   -----------  ----
                                                                   -----------  ----   -----------  ----   -----------  ----
</TABLE>
 
    GROSS MARGINS
 
    Gross  profit from product sales in fiscal 1996 was $26,661,000, or 41.2% of
net sales, compared to $24,108,000, or 43.1%, in fiscal 1995 and $20,868,000, or
43.9%, in fiscal  1994. The  decrease in  gross margin  in fiscal  1996 was  due
primarily  to lower  margins on certain  hollow fiber products.  The decrease in
gross margin in fiscal 1995 resulted primarily from reduced dialysis concentrate
margins. Unabsorbed dialyzer manufacturing costs depressed gross margins in each
of fiscal years 1996, 1995, and 1994.
 
    Some of the Company's research and  development efforts are directed to  the
development  of new versions of existing products.  Gross margin in the past has
not  been  materially  impacted  by  obsolete  inventories  resulting  from  the
introduction of new products. The Company does not expect inventory obsolescence
to impact gross margins significantly in the foreseeable future.
 
    RESEARCH AND DEVELOPMENT
 
    Research and development expenses in fiscal 1996 were $3,123,000, or 4.8% of
revenues,  compared  to  $3,133,00, or  5.6%  of  revenues, in  fiscal  1995 and
$2,893,000, or 6.1% of revenues, in fiscal
 
                                       11
<PAGE>
1994. The Company  intends to continue  investing a substantial  portion of  its
revenues in new product development. The Company expects that total research and
development expenses in fiscal 1997 will approximate 6% of revenues.
 
    SELLING, GENERAL AND ADMINISTRATIVE
 
    Selling,  general and  administrative expenses  as a  percentage of revenues
increased to 23.7% in fiscal 1996 compared to 21.3% in fiscal 1995 and 21.0%  in
fiscal  1994. The higher costs in fiscal  years 1996 and 1995 were due primarily
to increases in sales and  administrative staffs and expanded marketing  efforts
in  the United States, Europe and Japan  (in 1996). The Company expects selling,
general and administrative expenses will  approximate 24% of revenues in  fiscal
1997.
 
    INCOME TAXES
 
    The  Company recorded an income tax  provision in fiscal 1996 of $2,394,000,
an effective tax  rate of 36.5%,  compared to  effective tax rates  of 35.8%  in
fiscal  1995 and  38.1% in  fiscal 1994.  The Company  benefited from deductible
losses related to investments in foreign subsidiaries in both fiscal years  1996
and  1995. The Company's effective  income tax rate may  increase in fiscal 1997
and any such  increase will  vary depending upon  the operating  results of  its
foreign subsidiaries.
 
    NET EARNINGS
 
    Net earnings decreased by 27% in fiscal 1996 and totaled $4,308,000, or 6.7%
of revenues, compared to earnings of $5,920,000, or 10.5% of revenues, in fiscal
1995  and earnings  of $4,935,000,  or 10.3%  of revenues,  in fiscal  1994. The
decrease in earnings and net margin in  fiscal 1996 was due to higher  operating
expenses,  lower gross margin, and fiber  production scale-up losses of $936,000
incurred in the second quarter. The increase in earnings in fiscal 1995 was  due
to higher sales revenues.
 
    INFLATION
 
    Management believes inflation has not had a material effect on the Company's
results of operations or on its financial condition.
 
    LIQUIDITY AND CAPITAL RESOURCES
 
    The  Company continues to  maintain a strong balance  sheet, as evidenced by
the following liquidity trends:
 
<TABLE>
<CAPTION>
                                                                                      MARCH 31
                                                                        -------------------------------------
                                                                           1996         1995         1994
                                                                        -----------  -----------  -----------
<S>                                                                     <C>          <C>          <C>
Cash, cash equivalents and marketable securities......................  $ 5,219,000  $ 4,487,000  $ 7,699,000
Working capital.......................................................   22,128,000   18,106,000   17,875,000
Long-term debt........................................................      --           --         1,906,000
Stockholders' equity..................................................   41,210,000   35,052,000   28,704,000
Cash flow from operations.............................................    5,312,000    5,615,000    5,183,000
Cash dividends paid...................................................      653,000      623,000      --
</TABLE>
 
    The increases in cash and working capital  in fiscal 1996 were due to  funds
generated from operations. The decrease in cash in fiscal 1995 was due primarily
to  real estate acquisitions, retirement of  long-term debt, and the acquisition
of a product line. The  Company's current ratio at March  31, 1996 was 4.2 to  1
compared  to 4.6 to 1  at March 31, 1995. The  Company has an unused $10,000,000
bank line of credit which allows the Company to borrow on an unsecured basis  at
the prime rate of interest (8.25% at March 31, 1996).
 
    Accounts  receivable  increased  during  fiscal 1996  due  primarily  to the
increased  level  of  sales.  Inventories   increased  during  fiscal  1996   to
accommodate  increased sales in the U.S. and  internationally and as a result of
higher production  levels  of fiber  products.  Sales backlog  conditions  which
existed at the end of the prior year were eliminated in fiscal 1996.
 
                                       12
<PAGE>
    The  Company  continued  to  expand its  production  facilities  to increase
capacity to manufacture  new products  in fiscal  1996. The  Company expended  a
total of $4,333,000 for plant improvements and equipment in fiscal 1996 compared
to $3,573,000 in fiscal 1995 and $2,970,000 in fiscal 1994. The Company plans to
invest  approximately $4,000,000 in capital equipment in fiscal 1997 to meet the
needs of its  expanding business. During  fiscal 1995, the  Company purchased  a
building in The Netherlands for $1,539,000, acquired land in Plymouth, Minnesota
for $530,000, and retired mortgage debt of $1,942,000.
 
    The  Company in the first quarter of  fiscal 1996 acquired a group of hollow
fiber product lines for $1,402,000 in cash. In fiscal 1995, the Company acquired
an endoscope reprocessing product line for $934,000 in cash. Assets acquired  in
both of these transactions included inventory, equipment, and goodwill.
 
    Over  the past three years, proceeds  from stock option exercises provided a
total of $3,209,000  in equity capital  as follows: fiscal  1996 --  $1,979,000;
fiscal 1995 -- $909,000; and fiscal 1994 -- $321,000.
 
    In fiscal 1994, the Company repurchased 27,500 shares of its common stock in
open market transactions for $264,000.
 
    The  Company believes that its strong financial condition at March 31, 1996,
along with funds expected to be generated from operations, will be sufficient to
meet its working capital and capital equipment needs in fiscal 1997.
 
FOREIGN CURRENCY TRANSACTIONS
 
    Substantially all of the Company's U.S.-based export sales are invoiced  and
paid  in  U.S.  dollars.  The transactions  of  the  Company's Netherlands-based
subsidiary are invoiced and paid in several currencies including Dutch guilders,
German marks and U.S. dollars. The Company does not currently hedge its  foreign
currency  transactions. Accordingly, the Company  is subject to risks associated
with fluctuations in currency exchange rates.
 
ITEM 8.  FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA
 
    The  Financial  Statements  and  Reports  of  Independent  Certified  Public
Accountants are contained on pages 19 through 31 of this report.
 
    QUARTERLY FINANCIAL DATA
 
    Quarterly financial data has not been submitted because the Company has less
than 800 shareholders of record.
 
ITEM 9.  CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
         FINANCIAL DISCLOSURE
 
    Grant  Thornton LLP, the  Company's independent accountants  since 1974, was
dismissed on January  30, 1995  and Price Waterhouse  LLP was  appointed as  the
Company's  new independent accountants. Grant Thornton's report on the financial
statements for the year ended March 31, 1994 was unqualified. Price Waterhouse's
report on  the  financial statements  for  the year  ended  March 31,  1995  was
unqualified.  There have been no disagreements  with Grant Thornton LLP or Price
Waterhouse LLP on any  matter of accounting  principles or practices,  financial
statement  disclosure, or  auditing scope or  procedure. There  have occurred no
"reportable events" as defined in Item 304(a) of Regulation S-K. The decision to
change accountants was recommended by the Audit Committee of the Company's Board
of Directors and approved by the Board of Directors.
 
                                       13
<PAGE>
                                    PART III
 
ITEM 10.  DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT
 
    The information required under this Item  with respect to directors will  be
included  under the heading "Election of  Directors" in the Company's definitive
Proxy Statement for  the Annual Meeting  of Shareholders to  be held August  28,
1996, and is incorporated herein by reference.
 
    Pursuant  to Instruction 3 to Item  401(b) of Regulation S-K, information as
to executive officers of the  Company is set forth in  Part I of this Form  10-K
under the caption "Executive Officers of the Registrant."
 
ITEM 11.  EXECUTIVE COMPENSATION
 
    The  information required under this Item will be included under the heading
"Executive Compensation and Other Information" in the Company's definitive Proxy
Statement for the Annual Meeting of Shareholders to be held August 28, 1996, and
is incorporated herein by reference.
 
ITEM 12.  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT
 
    The information required under this Item will be included under the  heading
"Security  Ownership  of  Certain  Beneficial  Owners  and  Management"  in  the
Company's definitive Proxy Statement for  the Annual Meeting of Shareholders  to
be held August 28, 1996, and is incorporated herein by reference.
 
ITEM 13.  CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS
 
    None
 
                                    PART IV
 
ITEM 14.  EXHIBITS, FINANCIAL STATEMENT SCHEDULES, AND REPORTS ON FORM 8-K
 
    (a) Documents filed as part of report:
 
<TABLE>
<C>   <S>     <C>
  1           Financial Statements.
              The following consolidated financial statements of the Company and its
              subsidiaries are filed as a part of this Form 10-K
      (i)     Consolidated Balance Sheets March 31, 1996 and 1995
      (ii)    Consolidated Statements of Earnings three years ended March 31, 1996,
              1995, and 1994
      (iii)   Consolidated Statements of Stockholders' Equity three years ended
              March 31, 1996, 1995, and 1994
      (iv)    Consolidated Statements of Cash Flows three years ended March 31,
              1996, 1995, and 1994
      (v)     Notes to Consolidated Financial Statements
      (vi)    Reports of Independent Certified Public Accountants
  2           Schedules filed as part of this Form 10-K: none
              All schedules are omitted because they are not applicable to the
              Company or because the information required is included in the
              consolidated financial statements and notes thereto.
  3           Exhibits included herein:
  3   (a)     Articles of Incorporation, as amended (1)
  3   (b)     Amendment of By-Laws in March 1986 (2)
  3   (c)     Restated By-Laws (2)
  4           Form of Specimen Common Stock Certificate (3)
</TABLE>
 
                                       14
<PAGE>
<TABLE>
<C>   <S>     <C>
 10   (a)     1989 Stock Plan, as amended August 28, 1991 and August 25, 1993 (4)
 10   (b)     Restated 1982 Incentive Stock Option Plan, as amended (1)
 10   (c)     Form of Employment Agreement dated April 22, 1986 with certain
              officers of the Company (5)
 10   (d)     Form of Amendment dated February 27, 1989 to Employment Agreements
              dated April 22, 1986 (5)
 10   (e)     Form of Employment Agreement dated February 27,1989 with certain
              officers and key employees of the Company (5)
 10   (f)     1990 Employee Stock Purchase Plan, as amended June 1, 1993 (3)
 10   (g)     Supplemental Executive Retirement Plan effective April 1, 1996 (6)
 23   (a)     Consent of Price Waterhouse LLP
 23   (b)     Consent of Grant Thornton LLP
 27           Financial Data Schedule
</TABLE>
 
- ------------------------
(1)  Incorporated by  reference to  the specified exhibit  filed as  part of the
    Company's Annual Report on Form 10-K for the year ended March 31, 1988, File
    No. 0-11278.
 
(2) Incorporated by  reference to  the specified exhibit  filed as  part of  the
    Company's report on Form 8-K on March 12, 1986, File No. 0-11278.
 
(3)  Incorporated by  reference to  the specified exhibit  filed as  part of the
    Company's Annual Report on Form 10-K for the year ended March 31, 1993, File
    No. 0-11278.
 
(4) Incorporated by  reference to exhibit  4(a) filed as  part of the  Company's
    registration  statement on Form  S-8, which became  effective on December 5,
    1989, File No. 33-32070.
 
(5) Incorporated by  reference to  the specified exhibit  filed as  part of  the
    Company's Annual Report on Form 10-K for the year ended March 31, 1989, File
    No. 0-11278
 
(6)  Incorporated by  reference to  the specified exhibit  filed as  part of the
    Company's Annual Report on Form 10-K for the year ended March 31, 1995, File
    No. 0-11278.
 
    (b) Reports on Form 8-K.
 
    None.
 
                                       15
<PAGE>
                              MINNTECH CORPORATION
                          CONSOLIDATED BALANCE SHEETS
                                     ASSETS
 
<TABLE>
<CAPTION>
                                                                                 MARCH 31
                                                                        --------------------------
                                                                            1996          1995
                                                                        ------------  ------------
<S>                                                                     <C>           <C>
CURRENT ASSETS
  Cash and cash equivalents...........................................  $  4,064,391  $  3,324,738
  Marketable securities...............................................     1,154,336     1,162,607
  Accounts receivable, less allowance for doubtful accounts of
   $215,000 and $125,000..............................................    11,261,603    10,329,512
  Inventories.........................................................    11,435,335     7,463,675
  Prepaid expenses and other current assets...........................     1,196,796       911,544
                                                                        ------------  ------------
    TOTAL CURRENT ASSETS..............................................    29,112,461    23,192,076
PROPERTY AND EQUIPMENT, AT COST
  Land, buildings and improvements....................................     9,325,804     9,145,529
  Machinery and equipment.............................................    18,366,494    15,024,370
  Office and sales equipment..........................................     2,658,104     2,000,058
                                                                        ------------  ------------
                                                                          30,350,402    26,169,957
  Less accumulated depreciation.......................................   (13,026,907)  (10,538,447)
                                                                        ------------  ------------
                                                                          17,323,495    15,631,510
OTHER ASSETS
  Patent costs, net of accumulated amortization of $734,400 and
   $520,300...........................................................       801,961       617,254
  Goodwill, net of accumulated amortization of $603,000 and
   $181,600...........................................................     1,769,542     1,151,185
  Other...............................................................     1,039,121       681,566
                                                                        ------------  ------------
                                                                        $ 50,046,580  $ 41,273,591
                                                                        ------------  ------------
                                                                        ------------  ------------
</TABLE>
 
                      LIABILITIES AND STOCKHOLDERS' EQUITY
 
<TABLE>
<S>                                                                     <C>           <C>
CURRENT LIABILITIES
  Accounts payable....................................................  $  5,188,951  $  2,810,844
  Accrued compensation................................................     1,170,454     1,684,072
  Other accrued expenses..............................................       624,976       519,416
  Income taxes payable................................................       --             71,855
                                                                        ------------  ------------
    TOTAL CURRENT LIABILITIES.........................................     6,984,381     5,086,187
DEFERRED INCOME TAXES.................................................     1,412,000     1,135,000
DEFERRED COMPENSATION.................................................       129,455       --
MINORITY INTEREST.....................................................       310,472       --
COMMITMENTS...........................................................       --
STOCKHOLDERS' EQUITY
  Preferred stock -- 5,000,000 shares authorized, none outstanding....       --
  Common stock -- $.05 par value; 10,000,000 shares authorized;
   6,635,134 and 6,384,758 shares issued and outstanding..............       331,757       319,238
  Additional paid-in capital..........................................    11,646,498     9,124,098
  Retained earnings...................................................    29,232,017    25,609,068
                                                                        ------------  ------------
                                                                          41,210,272    35,052,404
                                                                        ------------  ------------
                                                                        $ 50,046,580  $ 41,273,591
                                                                        ------------  ------------
                                                                        ------------  ------------
</TABLE>
 
        The accompanying notes are an integral part of these statements.
 
                                       16
<PAGE>
                              MINNTECH CORPORATION
                      CONSOLIDATED STATEMENTS OF EARNINGS
 
<TABLE>
<CAPTION>
                                                                                YEARS ENDED MARCH 31
                                                                        -------------------------------------
                                                                           1996         1995         1994
                                                                        -----------  -----------  -----------
<S>                                                                     <C>          <C>          <C>
REVENUES
  Net sales -- products...............................................  $64,769,143  $55,882,512  $47,487,981
  Contract revenues...................................................      --           300,000      300,000
                                                                        -----------  -----------  -----------
    Total revenues....................................................   64,769,143   56,182,512   47,787,981
OPERATING COSTS AND EXPENSES
  Cost of product sales...............................................   38,108,313   31,774,240   26,620,243
  Research and development............................................    3,123,065    3,133,075    2,892,514
  Selling, general and administrative.................................   15,319,533   11,939,902   10,053,196
  Amortization of intangible assets...................................      762,552      358,068      197,578
  Loss due to fiber production scale-up...............................      936,000      --           --
                                                                        -----------  -----------  -----------
    Total operating costs and expenses................................   58,249,463   47,205,285   39,763,531
                                                                        -----------  -----------  -----------
EARNINGS FROM OPERATIONS..............................................    6,519,680    8,977,227    8,024,450
OTHER INCOME (EXPENSE)
  Interest expense....................................................       (1,849)    (192,009)    (250,697)
  Interest income and other, net......................................       44,384      428,639      206,352
                                                                        -----------  -----------  -----------
                                                                             42,535      236,630      (44,345)
                                                                        -----------  -----------  -----------
EARNINGS BEFORE INCOME TAXES AND MINORITY INTEREST....................    6,562,215    9,213,857    7,980,105
  Provision for income taxes..........................................    2,394,000    3,294,000    3,045,000
  Minority interest...................................................     (140,024)     --           --
                                                                        -----------  -----------  -----------
NET EARNINGS..........................................................  $ 4,308,239  $ 5,919,857  $ 4,935,105
                                                                        -----------  -----------  -----------
                                                                        -----------  -----------  -----------
NET EARNINGS PER SHARE                                                  $       .62  $       .90  $       .78
                                                                        -----------  -----------  -----------
                                                                        -----------  -----------  -----------
Weighted average common and common equivalent shares..................    6,923,821    6,613,391    6,354,348
                                                                        -----------  -----------  -----------
                                                                        -----------  -----------  -----------
</TABLE>
 
        The accompanying notes are an integral part of these statements.
 
                                       17
<PAGE>
                              MINNTECH CORPORATION
                CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
                   YEARS ENDED MARCH 31, 1996, 1995 AND 1994
 
<TABLE>
<CAPTION>
                                               COMMON STOCK
                                          ----------------------
                                            SHARES                ADDITIONAL
                                          ISSUED AND                PAID-IN     RETAINED
                                          OUTSTANDING    AMOUNT     CAPITAL     EARNINGS       TOTAL
                                          -----------   --------  -----------  -----------  -----------
<S>                                       <C>           <C>       <C>          <C>          <C>
BALANCES APRIL 1, 1993..................    6,066,954   $303,347  $ 7,461,143  $15,302,009  $23,066,499
Exercise of stock options, net of 19,971
 shares surrendered in payment..........      124,303      6,215      314,488      --           320,703
Tax benefit from exercise of stock
 options................................      --           --         648,100      --           648,100
Repurchases of common stock.............      (27,500)    (1,375)    (262,188)     --          (263,563)
Foreign currency translation
 adjustment.............................      --           --         --            (2,438)      (2,438)
Net earnings............................      --           --         --         4,935,105    4,935,105
                                          -----------   --------  -----------  -----------  -----------
BALANCES MARCH 31, 1994.................    6,163,757    308,187    8,161,543   20,234,676   28,704,406
Exercise of stock options, net of 25,465
 shares surrendered in payment..........      221,001     11,051      898,355           --      909,406
Tax benefit from exercise of stock
 options................................      --           --          64,200      --            64,200
Dividend paid...........................      --           --         --          (623,250)    (623,250)
Unrealized holding losses on
 investments............................                                          (153,803)    (153,803)
Foreign currency translation
 adjustment.............................      --           --         --           231,588      231,588
Net earnings............................      --           --         --         5,919,857    5,919,857
                                          -----------   --------  -----------  -----------  -----------
BALANCES MARCH 31, 1995.................    6,384,758    319,238    9,124,098   25,609,068   35,052,404
Exercise of stock options, net of 40,555
 shares surrendered in payment..........      250,376     12,519    1,966,540      --         1,979,059
Tax benefit from exercise of stock
 options................................      --           --         555,860      --           555,860
Dividend paid...........................      --           --         --          (652,542)    (652,542)
Reduction of unrealized holding losses
 on investments.........................      --           --         --            80,120       80,120
Foreign currency translation
 adjustment.............................      --           --         --          (112,868)    (112,868)
Net earnings............................      --           --         --         4,308,239    4,308,239
                                          -----------   --------  -----------  -----------  -----------
BALANCES MARCH 31, 1996.................    6,635,134   $331,757  $11,646,498  $29,232,017  $41,210,272
                                          -----------   --------  -----------  -----------  -----------
                                          -----------   --------  -----------  -----------  -----------
</TABLE>
 
        The accompanying notes are an integral part of these statements.
 
                                       18
<PAGE>
                              MINNTECH CORPORATION
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
 
<TABLE>
<CAPTION>
                                                                               YEARS ENDED MARCH 31
                                                                        ----------------------------------
                                                                           1996        1995        1994
                                                                        ----------  ----------  ----------
<S>                                                                     <C>         <C>         <C>
CASH FLOWS FROM OPERATING ACTIVITIES
Net earnings..........................................................  $4,308,239  $5,919,857  $4,935,105
  Adjustments to reconcile net earnings to net cash provided by
   operating activities
    Depreciation and amortization.....................................   3,406,339   2,775,352   2,290,535
    Tax benefit from stock option exercises...........................     555,860      64,200     648,100
    Deferred contract revenue.........................................      --        (300,000)   (300,000)
    Foreign currency exchange (gain) loss.............................     159,150    (204,146)     --
    Deferred income taxes.............................................    (143,600)     31,800     105,000
    Minority interest.................................................    (140,024)     --          --
    Other.............................................................     (65,177)     90,528     118,790
    Changes in assets and liabilities:
      Accounts receivable.............................................  (1,059,931) (2,429,575)   (994,149)
      Inventories.....................................................  (3,658,623) (1,198,859)   (537,629)
      Prepaid expenses................................................     135,348    (157,777)   (140,930)
      Accounts payable................................................   2,399,860     432,485     (60,532)
      Accrued expenses................................................    (513,618)    837,459    (762,346)
      Income taxes payable............................................     (71,855)   (246,647)   (119,242)
                                                                        ----------  ----------  ----------
      Total adjustments...............................................   1,003,729    (305,180)    247,597
                                                                        ----------  ----------  ----------
NET CASH PROVIDED BY OPERATING ACTIVITIES.............................   5,311,968   5,614,677   5,182,702
CASH FLOWS FROM INVESTING ACTIVITIES
  Purchases of property and equipment.................................  (4,333,385) (5,111,925) (2,970,214)
  Purchase of undeveloped land........................................      --        (529,842)     --
  Proceeds from sale of equipment.....................................      --          18,772      22,965
  Patent application costs............................................    (543,464)   (385,725)   (268,120)
  Acquisition of product lines........................................  (1,402,087)   (933,600)   (467,453)
  Other...............................................................      (2,387)     (1,742)     (2,572)
                                                                        ----------  ----------  ----------
NET CASH USED IN INVESTING ACTIVITIES.................................  (6,281,323) (6,944,062) (3,685,394)
CASH FLOWS FROM FINANCING ACTIVITIES
  Payments of long-term debt..........................................      --      (1,942,384)    (29,402)
  Proceeds from exercise of stock options.............................   1,979,059     909,406     320,703
  Minority interest capital contribution..............................     450,496      --          --
  Payment of cash dividends...........................................    (652,542)   (623,250)     --
  Repurchases of common stock.........................................      --          --        (263,563)
                                                                        ----------  ----------  ----------
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES...................   1,777,013  (1,656,228)     27,738
Effects of exchange rate changes on foreign currency cash balances....     (68,005)    103,533       1,872
                                                                        ----------  ----------  ----------
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS..................     739,653  (2,882,080)  1,526,918
Cash and cash equivalents at beginning of year........................   3,324,738   6,206,818   4,679,900
                                                                        ----------  ----------  ----------
CASH AND CASH EQUIVALENTS AT END OF YEAR..............................  $4,064,391  $3,324,738  $6,206,818
                                                                        ----------  ----------  ----------
                                                                        ----------  ----------  ----------
</TABLE>
 
        The accompanying notes are an integral part of these statements.
 
                                       19
<PAGE>
                              MINNTECH CORPORATION
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
NOTE A -- SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
    BUSINESS DESCRIPTION
 
    Minntech  Corporation is a leader in developing, manufacturing and marketing
medical  devices,  sterilants  and  water  filtration  products.  The  Company's
products  are used in kidney dialysis,  open-heart surgery, endoscopy and in the
preparation of pure water for medical, industrial and laboratory use.
 
    CONSOLIDATION POLICY
 
    The consolidated financial statements include  the accounts of the  Company,
its   majority-owned   subsidiary   and  its   wholly-owned   subsidiaries.  All
intercompany balances and transactions have been eliminated in consolidation.
 
    USE OF ESTIMATES
 
    The  preparation  of  financial  statements  in  conformity  with  generally
accepted  accounting  principles  requires  management  to  make  estimates  and
assumptions that  affect the  reported  amounts of  assets and  liabilities  and
disclosures  of contingent assets  and liabilities at the  date of the financial
statements and  the  reported  amounts  of  revenues  and  expenses  during  the
reporting period. Actual results could differ from those estimates.
 
    REVENUE RECOGNITION
 
    Sales  are recognized at  the time products are  shipped. The Company allows
customers to  return products  for credit  upon written  authorization from  the
Company.
 
    Contract  revenues  derived from  development  and marketing  agreements are
recorded as earned based on the performance requirements of the contract.
 
    FAIR VALUE DISCLOSURE OF FINANCIAL INSTRUMENTS
 
    The Company's  financial  instruments  consist  of  cash,  short-term  trade
receivables  and payables for  which their current  carrying amounts approximate
fair market value.
 
    CASH AND CASH EQUIVALENTS
 
    The Company considers all highly liquid temporary investments with  original
maturities  of  three months  or  less to  be  cash equivalents.  Cash  and cash
equivalents consisted of:
 
<TABLE>
<CAPTION>
                                                                            MARCH 31
                                                                  ----------------------------
                                                                      1996           1995
                                                                  -------------  -------------
<S>                                                               <C>            <C>
Cash............................................................  $   2,117,793  $   1,819,125
Money market mutual funds.......................................      1,946,598       --
Commercial paper................................................       --              502,213
Municipal bonds.................................................       --            1,003,400
                                                                  -------------  -------------
                                                                  $   4,064,391  $   3,324,738
                                                                  -------------  -------------
                                                                  -------------  -------------
</TABLE>
 
    A substantial  portion  of the  Company's  cash  balances are  held  in  one
financial institution.
 
    Commercial  paper, money market mutual funds  and municipal bonds are stated
at fair value, which approximates cost at March 31, 1996 and 1995.
 
    MARKETABLE SECURITIES
 
    The Company  adopted the  provisions of  Statement of  Financial  Accounting
Standards  No.  115,  "Accounting for  Certain  Investments in  Debt  and Equity
Securities" (SFAS 115), on April 1, 1994. In
 
                                       20
<PAGE>
                              MINNTECH CORPORATION
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
NOTE A -- SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
accordance with SFAS 115, prior period financial statements were not restated to
reflect the  change in  accounting principle.  The effect  of applying  the  new
standard  to prior periods would not have had a material impact on the Company's
financial statements.
 
    Marketable securities consisted of investments  in bond funds. At March  31,
1996  and 1995,  the adjusted cost  of the  funds exceed fair  market value. The
unrealized holding losses, net of income  taxes, are reported as a reduction  in
stockholders' equity.
 
    Marketable securities consisted of:
 
<TABLE>
<CAPTION>
                                                                            MARCH 31
                                                                  ----------------------------
                                                                      1996           1995
                                                                  -------------  -------------
<S>                                                               <C>            <C>
Adjusted cost...................................................  $   1,269,019  $   1,402,410
Unrealized holding loss.........................................        114,683        239,803
                                                                  -------------  -------------
Fair market value...............................................  $   1,154,336  $   1,162,607
                                                                  -------------  -------------
                                                                  -------------  -------------
</TABLE>
 
    INVENTORIES
 
    Inventories  are valued at the lower of cost or market, with cost determined
by the first-in, first-out method.
 
    Inventories consisted of:
 
<TABLE>
<CAPTION>
                                                                           MARCH 31
                                                                 -----------------------------
                                                                      1996           1995
                                                                 --------------  -------------
<S>                                                              <C>             <C>
Finished goods.................................................  $    4,768,680  $   2,658,231
Materials and work-in-process..................................       6,666,655      4,805,444
                                                                 --------------  -------------
                                                                 $   11,435,335  $   7,463,675
                                                                 --------------  -------------
                                                                 --------------  -------------
</TABLE>
 
    PROPERTY AND EQUIPMENT
 
    Property and equipment are depreciated  on a straight-line basis over  their
estimated  service  lives. Accelerated  and straight-line  methods are  used for
income tax reporting purposes.
 
    PATENT COSTS
 
    Patent application costs consist  principally of legal  and filing fees  and
are capitalized and amortized over five years.
 
    GOODWILL
 
    Goodwill  represents the  cost in  excess of  the fair  value of  net assets
acquired and is  amortized using  the straight-line  method over  five to  seven
years.  The Company periodically evaluates  the existence of goodwill impairment
on the  basis of  whether  the goodwill  is  fully recoverable  from  projected,
undiscounted net cash flows of the related business unit.
 
    RESEARCH AND DEVELOPMENT
 
    Research and development costs are charged to operations as incurred.
 
    INCOME TAXES
 
    Effective  April  1,  1993,  the  Company  adopted  Statement  of  Financial
Accounting Standards  No.  109, "Accounting  for  Income Taxes."  This  standard
required a change from the deferred method of accounting for income taxes. Under
the    asset   and   liability   method   of   Statement   109,   deferred   tax
 
                                       21
<PAGE>
                              MINNTECH CORPORATION
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
NOTE A -- SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
assets  and  liabilities  are  recognized   for  the  future  tax   consequences
attributable  to differences between the financial statement carrying amounts of
existing assets and liabilities and their respective tax bases. The adoption  of
this  standard  did  not  have  a material  impact  on  the  Company's financial
statements and no cumulative effect adjustment was required.
 
    FOREIGN CURRENCY TRANSLATION
 
    Foreign assets and liabilities  are translated to  U.S. dollars at  year-end
exchange  rates. Revenues  and expenses are  translated at  the average exchange
rates in effect for the year. Unrealized translation adjustments are reported as
a component of stockholders' equity.
 
NOTE B -- LINE OF CREDIT
    At March  31,  1996,  the Company  had  an  unused line  of  credit  with  a
commercial  bank which  allows the  Company to  borrow up  to $10,000,000  on an
unsecured basis at the prime  rate of interest (8.25%  at March 31, 1996).  This
line of credit expires August 31, 1997.
 
    Cash  payments  for  interest  on  debt  amounted  to  approximately $2,000,
$192,000 and $251,000 for fiscal years 1996, 1995 and 1994, respectively.
 
NOTE C -- SIGNIFICANT CUSTOMERS AND EXPORT SALES
    Sales to one unaffiliated customer accounted for approximately 23%, 25%  and
30%  of sales in fiscal years 1996, 1995 and 1994, respectively. The Company has
a corresponding concentration  of accounts  receivable due  from this  customer.
Sales  to this customer are  made under a contract  which is scheduled to expire
June 30, 1997.
 
    Consolidated sales outside  the United States,  principally to customers  in
Europe  and the Far East, amounted to $10,462,000, $7,261,000 and $4,586,000, in
fiscal years 1996, 1995 and 1994, respectively.
 
NOTE D -- INCOME TAXES
    The provision for income taxes consisted of the following:
 
<TABLE>
<CAPTION>
YEAR ENDED MARCH 31,                                    FEDERAL        STATE         TOTAL
- ---------------------------------------------------  -------------  -----------  -------------
<S>                                                  <C>            <C>          <C>
1996
Currently payable..................................  $   2,375,600  $   162,000  $   2,537,600
Deferred...........................................       (146,100)       2,500       (143,600)
                                                     -------------  -----------  -------------
                                                     $   2,229,500  $   164,500  $   2,394,000
                                                     -------------  -----------  -------------
                                                     -------------  -----------  -------------
1995
Currently payable..................................  $   3,016,300  $   245,900  $   3,262,200
Deferred...........................................         25,800        6,000         31,800
                                                     -------------  -----------  -------------
                                                     $   3,042,100  $   251,900  $   3,294,000
                                                     -------------  -----------  -------------
                                                     -------------  -----------  -------------
1994
Currently payable..................................  $   2,721,000  $   219,000  $   2,940,000
Deferred...........................................        102,000        3,000        105,000
                                                     -------------  -----------  -------------
                                                     $   2,823,000  $   222,000  $   3,045,000
                                                     -------------  -----------  -------------
                                                     -------------  -----------  -------------
</TABLE>
 
                                       22
<PAGE>
                              MINNTECH CORPORATION
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
NOTE D -- INCOME TAXES (CONTINUED)
    The provision for income taxes differs  from the statutory U.S. federal  tax
rate of 34% applied to earnings before income taxes as follows:
 
<TABLE>
<CAPTION>
                                                                        YEARS ENDED MARCH 31
                                                             -------------------------------------------
                                                                 1996           1995           1994
                                                             -------------  -------------  -------------
<S>                                                          <C>            <C>            <C>
Income tax expense at statutory federal income tax rates...  $   2,254,700  $   3,132,700  $   2,713,200
Foreign subsidiary losses..................................        671,600        261,800        224,800
State income taxes, net of federal tax benefit.............        108,500        166,300        155,000
Exempt income attributable to foreign sales................        (51,000)       (59,200)      --
Loss on investment in foreign subsidiary...................       (593,800)      (189,700)      --
Other, net.................................................          4,000        (17,900)       (48,000)
                                                             -------------  -------------  -------------
                                                             $   2,394,000  $   3,294,000  $   3,045,000
                                                             -------------  -------------  -------------
                                                             -------------  -------------  -------------
</TABLE>
 
    The  tax  effects  of cumulative  temporary  differences that  give  rise to
significant portions of the deferred tax assets and liabilities are as follows:
 
<TABLE>
<CAPTION>
                                                                                     MARCH 31
                                                                           -----------------------------
                                                                                1996           1995
                                                                           --------------  -------------
<S>                                                                        <C>             <C>
Deferred tax assets
  Foreign subsidiary net operating losses................................  $    1,525,000  $     705,300
  Allowance for doubtful accounts........................................          50,700         45,000
  Inventories............................................................         230,900        108,200
  Unrealized holding losses on investments...............................          40,900         86,000
  Accrued vacation pay...................................................         152,500        126,000
  Amortization of goodwill...............................................         100,700       --
  Other, net.............................................................         179,000         14,000
                                                                           --------------  -------------
  Gross deferred tax asset...............................................       2,279,700      1,084,500
  Valuation allowance....................................................      (1,525,000)      (705,300)
                                                                           --------------  -------------
  Net deferred tax asset.................................................  $      754,700  $     379,200
                                                                           --------------  -------------
                                                                           --------------  -------------
Deferred tax liability
  Plant and equipment depreciation.......................................  $    1,412,000  $   1,135,000
                                                                           --------------  -------------
                                                                           --------------  -------------
</TABLE>
 
    The Company recorded valuation allowances related to foreign subsidiary  net
operating  losses which are  not recognized until  their ultimate realization is
considered to be more likely than not.
 
    Cash payments for income taxes were approximately $2,345,000, $3,452,000 and
$2,475,900 in fiscal years 1996, 1995 and 1994, respectively.
 
NOTE E -- COMMITMENTS
 
    OPERATING LEASES
 
    Total rental expense for  operating leases for fiscal  years 1996, 1995  and
1994 was approximately $905,000, $808,000 and $680,000, respectively.
 
                                       23
<PAGE>
                              MINNTECH CORPORATION
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
NOTE E -- COMMITMENTS (CONTINUED)
    Future  minimum  lease payments  for operating  leases, net  of cancellation
clauses, consist of the following at March 31, 1996:
 
<TABLE>
<CAPTION>
  FISCAL YEAR                                                    AMOUNT
- -------------------------------------------------------------  -----------
<S>                                                            <C>
  1997.......................................................  $   479,900
  1998.......................................................      315,800
  1999.......................................................       73,700
  2000.......................................................        9,000
  2001.......................................................        8,300
                                                               -----------
                                                               $   886,700
                                                               -----------
                                                               -----------
</TABLE>
 
    SEVERANCE AGREEMENTS
 
    The Company has  employment agreements  with certain  officers that  provide
severance pay benefits if there is a change in control of the Company. Under the
agreements,  these officers receive 100% of  such severance benefits if they are
involuntarily terminated and 50% of such severance benefits if they  voluntarily
terminate.  The maximum contingent liability under these agreements at March 31,
1996 was approximately $2,248,000.
 
NOTE F -- STOCK OPTIONS
    At March 31, 1996, the Company had 1,817,408 shares of common stock reserved
under its  1982 Incentive  Stock Option  Plan  and 1989  Stock Plan.  The  plans
provide  for  incentive  stock  options  and  other  options  to  be  granted to
directors, officers, key  employees, and  consultants at an  exercise price  not
less than fair market value of the common stock at the date of grant.
 
    Option transactions under these plans during the three years ended March 31,
1996 are summarized as follows:
 
<TABLE>
<CAPTION>
                                                               NUMBER      AVERAGE          OPTION
                                                              OF SHARES  OPTION PRICE     PRICE RANGE
                                                              ---------  ------------   ---------------
<S>                                                           <C>        <C>            <C>
Outstanding at April 1, 1993................................  1,472,532     $10.03      $ 2.03 - $17.25
Granted.....................................................    398,150      11.31        9.50 -  11.50
Exercised...................................................   (128,722)      2.90        2.03 -  11.25
Cancelled...................................................   (176,438)     12.29        4.83 -  16.75
                                                              ---------  ------------   ---------------
Outstanding at March 31, 1994...............................  1,565,522       9.87        2.03 -  16.75
Granted.....................................................     96,150      14.45       10.88 -  15.83
Exercised...................................................   (231,421)      4.89        2.03 -  13.75
Cancelled...................................................   (121,035)     12.60        9.50 -  15.83
                                                              ---------  ------------   ---------------
Outstanding at March 31, 1995...............................  1,309,216      10.84        2.03 -  16.75
Granted.....................................................    677,010      17.29       13.50 -  20.50
Exercised...................................................   (273,058)      8.94        2.03 -  13.75
Cancelled...................................................    (88,753)     13.27        9.50 -  19.25
                                                              ---------  ------------   ---------------
Outstanding at March 31, 1996...............................  1,624,415      13.97        2.03 -  20.50
                                                              ---------  ------------   ---------------
                                                              ---------  ------------   ---------------
</TABLE>
 
    In  July 1993, 234,000 options granted in 1991 and 1992 with exercise prices
ranging from $14.00  to $17.25  were repriced to  $11.25 per  share, the  market
price at the time of repricing.
 
    Options to purchase 957,912 shares were exercisable at March 31, 1996.
 
                                       24
<PAGE>
                              MINNTECH CORPORATION
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
NOTE F -- STOCK OPTIONS (CONTINUED)
    The  Company adopted an employee stock purchase  plan on June 1, 1990. Under
the plan, 562,500 shares of common stock were reserved for issuance to  eligible
employees.  The  plan allows  employees to  designate  up to  10% of  their base
salaries for purchase of common stock at 85% of fair market value.
 
    A total of 81,363 shares have been issued under the plan since inception  as
follows:
 
<TABLE>
<CAPTION>
                                                                     NUMBER
  MAY 31                                                            OF SHARES
- -----------------------------------------------------------------  -----------
<S>                                                                <C>
  1995...........................................................      17,873
  1994...........................................................      15,045
  1993...........................................................      15,552
  1992...........................................................      14,787
  1991...........................................................      18,106
</TABLE>
 
    At  March  31,  1996,  the  Company held  a  total  of  $162,800  in payroll
withholdings for the purchase of stock under the plan.
 
    The Financial Accounting Standards Board has issued FAS 123, "Accounting for
Stock Based Compensation."  FAS 123  establishes a  fair value  based method  of
accounting  for employee stock based compensation plans and encourages companies
to adopt that method. However, it also allows companies to continue to apply the
intrinsic value  based method  currently prescribed  under APB  Opinion No.  25,
provided  certain pro forma disclosures are made.  FAS 123 is not required to be
adopted by the Company until fiscal year 1997. The Company currently intends  to
continue  to apply the accounting method  prescribed by APB 25 and, accordingly,
the adoption of FAS 123 will not have a material impact on the Company.
 
NOTE G -- PROFIT SHARING AND RETIREMENT SAVINGS
    The Company has a  401(k) retirement savings and  profit sharing plan  under
which eligible employees may contribute up to 10% of their salaries. The Company
matches  10%  of  employee  contributions  to a  maximum  of  6/10ths  of  1% of
compensation. The Company also makes annual profit sharing contributions to  the
plan  at the discretion  of the Board of  Directors. The Company's contributions
are as follows:
 
<TABLE>
<CAPTION>
                                                    YEARS ENDED MARCH 31
                                               -------------------------------
                                                 1996       1995       1994
                                               ---------  ---------  ---------
<S>                                            <C>        <C>        <C>
Matching 401(k)contributions.................  $  42,800  $  38,800  $  32,900
Profit sharing contributions.................     --        363,600    171,700
                                               ---------  ---------  ---------
                                               $  42,800  $ 402,400  $ 204,600
                                               ---------  ---------  ---------
                                               ---------  ---------  ---------
</TABLE>
 
NOTE H -- PREFERRED STOCK
    The Company's Board of Directors is authorized to issue five million  shares
of  no par value preferred stock in one  or more series. The board can determine
voting, conversion, dividend  and redemption  rights, and  other preferences  of
each series. No shares have been issued under this authorization.
 
                                       25
<PAGE>
                              MINNTECH CORPORATION
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
NOTE I -- FOREIGN OPERATIONS
    Amounts attributable to foreign operations, primarily in Europe, included in
the  consolidated financial statements at  March 31, 1996 and  for the year then
ended are as follows:
 
<TABLE>
<S>                                                              <C>
Net sales of consolidated foreign subsidiaries.................  $ 6,439,973
Operating losses of consolidated foreign subsidiaries..........  $(1,582,564)
Total assets of consolidated foreign subsidiaries..............  $ 7,307,790
</TABLE>
 
NOTE J -- NET EARNINGS PER SHARE
    Net earnings per share are computed based on the weighted average number  of
common shares and common equivalent shares outstanding. Common share equivalents
include  potentially dilutive stock options  using the "modified treasury stock"
method. Shares used in the computations are as follows:
 
<TABLE>
<CAPTION>
                                                 YEARS ENDED MARCH 31
                                            -------------------------------
                                              1996       1995       1994
                                            ---------  ---------  ---------
<S>                                         <C>        <C>        <C>
Weighted average common shares
 outstanding..............................  6,517,126  6,274,270  6,129,153
Weighted average common equivalent shares
 for stock options........................    406,695    339,121    225,195
                                            ---------  ---------  ---------
                                            6,923,821  6,613,391  6,354,348
                                            ---------  ---------  ---------
                                            ---------  ---------  ---------
</TABLE>
 
                                       26
<PAGE>
                       REPORT OF INDEPENDENT ACCOUNTANTS
 
Board of Directors and Stockholders
Minntech Corporation
 
    In  our opinion, the accompanying consolidated balance sheet and the related
consolidated statements of earnings, of  stockholders' equity and of cash  flows
present  fairly, in  all material respects,  the financial  position of Minntech
Corporation and its subsidiaries at March 31, 1996 and 1995, and the results  of
their  operations and their  cash flows for  the years then  ended in conformity
with generally accepted  accounting principles. These  financial statements  are
the responsibility of the Company's management; our responsibility is to express
an  opinion on these financial statements based  on our audits. We conducted our
audits of  these  statements  in accordance  with  generally  accepted  auditing
standards  which require that we plan and perform the audit to obtain reasonable
assurance  about  whether  the  financial   statements  are  free  of   material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the  amounts  and  disclosures  in  the  financial  statements,  assessing   the
accounting  principles used  and significant  estimates made  by management, and
evaluating the overall  financial statement  presentation. We  believe that  our
audits provide a reasonable basis for the opinion expressed above.
 
                                          Price Waterhouse LLP
 
Minneapolis, Minnesota
June 12, 1996
 
                                       27
<PAGE>
               REPORT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS
 
Board of Directors and Stockholders
Minntech Corporation and Subsidiaries
 
    We  have  audited  the  accompanying  consolidated  statements  of earnings,
stockholders' equity,  and  cash  flows of  Minntech  Corporation  (a  Minnesota
corporation) and Subsidiaries for the year ended March 31, 1994. These financial
statements   are   the   responsibility  of   the   Company's   management.  Our
responsibility is to express an opinion  on these financial statements based  on
our audit.
 
    We  conducted  our  audit  in accordance  with  generally  accepted auditing
standards. These standards require that we plan and perform the audit to  obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also  includes
assessing  the  accounting principles  used  and significant  estimates  made by
management, as well as evaluating the overall financial statement  presentation.
We believe our audit provides a reasonable basis for our opinion.
 
    In  our opinion, the financial statements  referred to above present fairly,
in  all  material   respects,  the  consolidated   results  of  operations   and
consolidated  cash flows of  Minntech Corporation and  Subsidiaries for the year
ended  March  31,  1994  in   conformity  with  generally  accepted   accounting
principles.
 
                                          Grant Thornton LLP
 
Minneapolis, Minnesota
May 20, 1994
 
                                       28
<PAGE>
                                   SIGNATURES
 
    Pursuant  to  the requirements  of  Section 13  or  15(d) of  the Securities
Exchange Act of 1934, the registrant has duly caused this report to be signed on
its behalf by the undersigned, thereunto duly authorized.
 
                                          MINNTECH CORPORATION
                                            (Registrant)
 
                                          By        LOUIS COSENTINO, PH.D.
                                            ------------------------------------
                                                    Louis Cosentino, Ph.D.
                                              PRESIDENT AND CHIEF EXECUTIVE
                                             OFFICER
 
Date:  July 12, 1996
 
    Pursuant to the requirements of the Securities Exchange Act of 1934, this
report has been signed below by the following persons on behalf of the
registrant and in the capacities and on the dates indicated.
 
<TABLE>
<CAPTION>
                   SIGNATURE                                          TITLE                             DATE
- -----------------------------------------------  -----------------------------------------------  ----------------
<S>                                              <C>                                              <C>
 
           LOUIS C. COSENTINO, PH.D.             President, Chief Executive Officer and Director   July 12, 1996
- ------------------------------------               (Principal Executive Officer)
           Louis C. Cosentino, Ph.D.
 
                WARREN M. WHITE                  Chief Financial Officer (Principal Accounting     July 12, 1996
- ------------------------------------               and Financial Officer)
                Warren M. White
 
                 GEORGE HEENAN                   Director                                          July 12, 1996
- ------------------------------------
                 George Heenan
 
                AMOS HEILICHER                   Director                                          July 12, 1996
- ------------------------------------
                Amos Heilicher
 
                  NORMAN DANN                    Director                                          July 12, 1996
- ------------------------------------
                  Norman Dann
 
             FRED L. SHAPIRO, M.D.               Director                                          July 12, 1996
- ------------------------------------
             Fred L. Shapiro, M.D.
 
               DONALD H. SOUKUP                  Director                                          July 12, 1996
- ------------------------------------
               Donald H. Soukup
</TABLE>
 
                                       29
<PAGE>
                              MINNTECH CORPORATION
 
                 INDEX OF EXHIBITS TO ANNUAL REPORT ON FORM 10K
 
<TABLE>
<CAPTION>
 EXHIBIT                                   DESCRIPTION OF EXHIBIT                                    FORM OF FILING
- ---------  ---------------------------------------------------------------------------------------  ----------------
<S>        <C>                                                                                      <C>
 3(a)      Articles of Incorporation, as amended (1)
 3(b)      Amendment of By-Laws in March 1986 (2)
 3(c)      Restated By-Laws (2)
 4         Form of Specimen Common Stock Certificate (3)
10(a)      1989 Stock Plan, as amended August 28, 1991 and August 25, 1993 (4)
10(b)      Restated 1982 Incentive Stock Option Plan, as amended (1)
10(c)      Form of Employment Agreement dated April 22, 1986 with certain officers of the Company
           (5)
10(d)      Form of Amendment dated February 27, 1989 to Employment Agreements dated April 22, 1986
           (5)
10(e)      Form of Employment Agreement dated February 27, 1989 with certain officers and key
           employees of the Company (5)
10(f)      1990 Employee Stock Purchase Plan, as amended June 1, 1993 (3)
10(g)      Supplemental Executive Retirement Plan effective April 1, 1996 (6)
23(a)      Consent of Price Waterhouse LLP                                                             Electronic
                                                                                                      Transmission
23(b)      Consent of Grant Thornton LLP                                                               Electronic
                                                                                                      Transmission
27         Financial Data Schedule                                                                     Electronic
                                                                                                      Transmission
</TABLE>
 
- ------------------------
(1)  Incorporated by  reference to  the specified exhibit  filed as  part of the
    Company's Annual Report on Form 10-K for the year ended March 31, 1988, File
    No. 0-11278.
 
(2) Incorporated by  reference to  the specified exhibit  filed as  part of  the
    Company's report on Form 8-K on March 12, 1986, File No. 0-11278.
 
(3)  Incorporated by  reference to  the specified exhibit  filed as  part of the
    Company's Annual Report on Form 10-K for the year ended March 31, 1993, File
    No. 0-11278.
 
(4) Incorporated by  reference to exhibit  4(a) filed as  part of the  Company's
    registration  statement on Form  S-8, which became  effective on December 5,
    1989, File No. 33-32070.
 
(5) Incorporated by  reference to  the specified exhibit  filed as  part of  the
    Company's Annual Report on Form 10-K for the year ended March 31, 1989, File
    No. 0-11278
 
(6)  Incorporated by  reference to  the specified exhibit  filed as  part of the
    Company's Annual Report on Form 10-K for the year ended March 31, 1995, File
    No. 0-11278.

<PAGE>
                                                                   EXHIBIT 23(a)
 
                       CONSENT OF INDEPENDENT ACCOUNTANTS
 
    We  hereby consent  to the  incorporation by  reference in  the Registration
Statements on  Form S-8  (File No.  2-99511 effective  July 18,  1985; File  No.
33-32070  effective December 5, 1989; File  No. 33-34621 effective May 20, 1990;
File No. 33-35368 effective July 1,  1990; File No. 33-35990 effective July  24,
1990;  and File No. 33-45351 effective January 28, 1992) of Minntech Corporation
of our report dated June 12, 1996, appearing on page 27 of this Form 10-K.
 
                                          Price Waterhouse LLP
 
Minneapolis, Minnesota
July 11, 1996

<PAGE>
                                                                   EXHIBIT 23(b)
 
              CONSENT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS
 
    We  have issued our report dated May 20,  1994, appearing on page 28 of this
Form 10-K, accompanying  the consolidated financial  statements included in  the
Annual Report on Form 10-K of Minntech Corporation and Subsidiaries for the year
ended  March 31, 1996.  We hereby consent  to the incorporation  by reference of
said report in the Registration Statements of Minntech Corporation on Forms  S-8
(File  No. 2-99511 effective July 18, 1988; File No. 33-32070 effective December
5, 1989; File No. 33-34621 effective  May 20, 1990; File No. 33-35368  effective
July  1, 1990; File No. 33-335990 effective July 24, 1990; and File No. 33-45351
effective January 28, 1992).
 
                                          Grant Thornton LLP
 
Minneapolis, Minnesota
July 8, 1996

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED BALANCE SHEET AND STATEMENT OF EARNINGS WHICH SHOULD BE READ IN
CONJUNCTION WITH THIS INFORMATION AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE
TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          MAR-31-1996
<PERIOD-START>                             APR-01-1995
<PERIOD-END>                               MAR-31-1996
<CASH>                                         4064391
<SECURITIES>                                   1154336
<RECEIVABLES>                                 11476603
<ALLOWANCES>                                    215000
<INVENTORY>                                   11435335
<CURRENT-ASSETS>                               1196796
<PP&E>                                        30350402
<DEPRECIATION>                                13026907
<TOTAL-ASSETS>                                50046580
<CURRENT-LIABILITIES>                          6984381
<BONDS>                                              0
                         11978255
                                          0
<COMMON>                                             0
<OTHER-SE>                                           0
<TOTAL-LIABILITY-AND-EQUITY>                  50046580
<SALES>                                       64769143
<TOTAL-REVENUES>                              64769143
<CGS>                                         38108313
<TOTAL-COSTS>                                 58249463
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                 66000
<INTEREST-EXPENSE>                                1849
<INCOME-PRETAX>                                6562215
<INCOME-TAX>                                   2394000
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   4308239
<EPS-PRIMARY>                                      .62
<EPS-DILUTED>                                        0
        

</TABLE>


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