STERIS CORP
S-3, 1996-06-21
ORTHOPEDIC, PROSTHETIC & SURGICAL APPLIANCES & SUPPLIES
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<PAGE>   1
      As filed with the Securities and Exchange Commission on June 21, 1996
                                                      Registration No. 33-
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


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

                                    FORM S-3
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

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

                               STERIS CORPORATION
             (Exact name of Registrant as specified in its charter)
                 OHIO                                       34-1482024
     (STATE OR OTHER JURISDICTION                        (I.R.S. EMPLOYER
   OF INCORPORATION OR ORGANIZATION)                  IDENTIFICATION NUMBER)

            5960 HEISLEY ROAD, MENTOR, OHIO 44060-1868 (216) 354-2600
    (Address, including zip code, and telephone number, including area code,
                  of Registrant's principal executive offices)

                MICHAEL A. KERESMAN, III, SENIOR VICE PRESIDENT,
                     CHIEF FINANCIAL OFFICER AND SECRETARY
  STERIS CORPORATION, 5960 HEISLEY ROAD, MENTOR, OHIO 44060-1868 (216) 354-2600
            (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)

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


      ROY L. TURNELL, ESQ.        COPIES TO:      DAVID A. BRITTENHAM,  ESQ.
  THOMPSON HINE & FLORY P.L.L.                       DEBEVOISE & PLIMPTON
       3900 SOCIETY CENTER                             875 THIRD AVENUE
        127 PUBLIC SQUARE                          NEW YORK, NEW YORK 10022
      CLEVELAND, OHIO 44114                             (212) 909-6000
         (216) 566-5500

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

 APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE OF SECURITIES TO THE PUBLIC:
               As soon as practicable after the effective date of
                          this Registration Statement.

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

            If the only securities being registered on this form are being
offered pursuant to dividend or interest reinvestment plans, please check the
following box. / /

            If any of the securities being registered on this form are to be
offered on a delayed or continuous basis pursuant to Rule 415 under the
Securities Act of 1933, other than securities offered only in connection with
dividend or interest reinvestment plans, check the following box. /X/

            If this Form is filed to register additional securities for an
offering pursuant to Rule 462(b) under the Securities Act, please check the
following box and list the Securities Act registration statement number of the
earlier effective registration statement for the same offering. / /

            If this Form is a post-effective amendment filed pursuant to Rule
462(c) under the Securities Act, check the following box and list the Securities
Act registration statement number of the earlier effective registration
statement for the same offering. / /

            If delivery of the prospectus is expected to be made pursuant to
Rule 434, please check the following box. / /


                         CALCULATION OF REGISTRATION FEE
                         -------------------------------
<TABLE>
<CAPTION>
============================================================================================================================
                                                   PROPOSED MAXIMUM        PROPOSED MAXIMUM
    TITLE OF SHARES TO BE      AMOUNT TO BE         AGGREGATE PRICE       AGGREGATE OFFERING            AMOUNT OF
          REGISTERED            REGISTERED             PER UNIT(1)               PRICE               REGISTRATION FEE
- ----------------------------------------------------------------------------------------------------------------------------
<S>                               <C>                   <C>                    <C>                       <C>
        Common Shares,
      without par value           727,938               $33.00                 $24,021,954               $8,283.43
============================================================================================================================

<FN>
1 Pursuant to Rule 457(c), the proposed offering price is based upon the average
of the high and low prices of the Common Stock on June 20, 1996 as reported by
the Nasdaq National Market System.
</TABLE>

THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR DATES
AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL FILE
A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION STATEMENT
SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF THE
SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(a),
MAY DETERMINE.



<PAGE>   2



                    727,938 COMMON SHARES, WITHOUT PAR VALUE

                               STERIS CORPORATION

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

            This Prospectus relates to up to 727,938 common shares, without par
value (the "Shares") of STERIS Corporation ("STERIS or the "Company"). The
Shares may be offered by a shareholder of the Company (the "Selling
Shareholder"). 690,000 of the Shares are issuable by the Company upon the
exercise of options issued by the Company to the Selling Shareholder and 37,938
Shares are held by the Selling Shareholder pursuant to a Restricted Stock
Agreement between the Selling Shareholder and AMSCO International, Inc., a
wholly-owned subsidiary of the Company. See "Selling Shareholder".

            The Selling Shareholder has not advised STERIS of any specific plans
for the distribution of the Shares. The Shares may be sold from time to time in
transactions (which may include block transactions) on the Nasdaq National
Market at the market price then prevailing. Sales of the Shares may also be made
through negotiated transactions or otherwise. The Selling Shareholder and the
brokers and dealers through which the sales of the Shares may be made may be
deemed to be "underwriters" within the meaning set forth in the Securities Act
of 1933, as amended, and their commissions and discounts and other compensation
may be regarded as underwriters' compensation.

            STERIS will not receive any proceeds from the sale of Shares by the
Selling Shareholder. All expenses incurred in connection with this offering are
being borne by STERIS, other than any commissions or discounts paid or allowed
by the Selling Shareholder to underwriters, dealers, brokers or agents.

            STERIS Common Shares are listed on the Nasdaq National Market under
the symbol "STRL." On June 20, 1996, the last reported sale price of STERIS
Common Shares reported on the Nasdaq National Market was $32 3/8 per share.

SEE "RISK FACTORS" BEGINNING ON PAGE 3 WHICH SHOULD BE CONSIDERED CAREFULLY BY
PROSPECTIVE PURCHASERS OF THE SHARES.

THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE
SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
COMMISSION NOR HAS THE SECURITIES AND EXCHANGE COMMISSION OR ANY
STATE SECURITIES COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF
THIS PROSPECTUS.  ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL
OFFENSE.

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

                         The date of this Prospectus is
                                  June __, 1996



<PAGE>   3




                              AVAILABLE INFORMATION

            STERIS is subject to the informational requirements of the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), and in
accordance therewith, files reports, proxy statements, and other information
with the Securities and Exchange Commission (the "Commission"). These reports,
proxy statements, and other information filed by STERIS with the Commission can
be inspected and copied at the Commission's public reference room located at
Judiciary Plaza, 450 Fifth Street, N.W., Room 1024, Washington, D.C. 20549, and
at the public reference facilities in the Commission's regional offices located
at Suite 1300, 7 World Trade Center, New York, New York 10048, and Citicorp
Center, Suite 1400, 500 West Madison Street, Chicago, Illinois 60661. Copies of
such material can be obtained at prescribed rates by writing to the Commission,
Public Reference Section, 450 Fifth Street, N.W., Washington, D.C. 20549. The
Commission maintains a web site that contains reports, proxy and information
statements and other information regarding registrants that file electronically
with the Commission. The address of the Commission's web site is
http://www.sec.gov. The STERIS Common Shares are quoted on The National 
Association of Securities Dealers Automated Quotation National Market ("Nasdaq
National Market") and, as such, the periodic reports, proxy statements, and 
other information filed by STERIS with the Commission may be inspected at the 
National Association of Securities Dealers, Inc., 1735 K Street, N.W., 
Washington, D.C. 20549.

            STERIS has filed with the Commission a Registration Statement on
Form S-3 (the "Registration Statement") under the Securities Act of 1933, as
amended (the "Securities Act"), with respect to the Shares offered hereby. This
Prospectus does not contain all of the information set forth in the Registration
Statement or the exhibits thereto. As permitted by the rules and regulations of
the Commission, this Prospectus omits certain information contained or
incorporated by reference in the Registration Statement. Statements contained in
this Prospectus as to the contents of any contract or other document filed or
incorporated by reference as an exhibit to the Registration Statement are not
necessarily complete, and in each instance reference is made to the copy of such
contract or other document filed as an exhibit to the Registration Statement.
For further information, reference is hereby made to the Registration Statement
and exhibits thereto, copies of which may be inspected at the offices of the
Commission at 450 Fifth Street, N.W., Washington, D.C. 20549 or obtained from
the Commission at the same addressed at prescribed rates. Electronic
registration statements made through the Electronic Data Gathering, Analysis,
and Retreval system are publicly available through the Commission's web site
(http://www.sec.gov.).

                INCORPORATION OF CERTAIN INFORMATION BY REFERENCE

            The following documents filed with the Commission by STERIS (File
No. 0-20165) are incorporated herein by reference: (a) STERIS's Annual Report on
Form 10-K for the fiscal year ended March 31, 1995 filed with the Commission on
June 28, 1995, (b) STERIS's Quarterly Reports on Form 10-Q for the quarterly
periods ended June 30, 1995, September 30, 1995, and December 31, 1995 filed
with the Commission on July 25, 1995, November 2, 1995, and February 13, 1996,
respectively, (d) STERIS's Current Reports on Form 8-K dated December 16, 1995
and May 13, 1996 filed with the Commission on December 26, 1995 and May 28, 
1996, (e) the description of STERIS's Common Shares contained in STERIS's
Registration Statement on Form 8-A filed with the Commission pursuant to Section
12(g) of the Exchange Act on May 1, 1992 and (f) STERIS'S Registration 
Statement on Form S-4 (Registration No. 333-1610).



<PAGE>   4



            The following documents filed with the Commission by AMSCO (File No.
1-10705) are incorporated herein by reference: (a) AMSCO's Annual Report on Form
10-K for the fiscal year ended December 31, 1995 filed with the Commission on
March 26, 1996 and (b) AMSCO's Quarterly Report on Form 10-Q for the quarterly
period ended March 31, 1996 filed with the Commission on May 3, 1996.

            All documents filed by STERIS pursuant to Section 13(a), 13(c), 14,
and 15(d) of the Exchange Act subsequent to the date hereof shall be deemed to
be incorporated herein by reference and to be a part hereof from the date of
such filing. Any statement contained herein or in a document incorporated or
deemed to be incorporated herein by reference shall be deemed to be modified or
superseded for purposes hereof to the extent that a statement contained herein
or in any other subsequently filed document which also is, or is deemed to be,
incorporated herein by reference modifies or supersedes such statement. Any such
statement so modified or superseded shall not be deemed to constitute a part
hereof, except as so modified or superseded.

            This Prospectus incorporates documents by reference which are not
presented herein or delivered herewith. Copies of these documents (excluding
exhibits unless such exhibits are specifically incorporated by reference into
the information incorporated herein) will be provided by first class mail
without charge to each person to whom this Prospectus is delivered, upon written
or oral request by such person to Michael A. Keresman, III, STERIS Corporation,
5960 Heisley Road, Mentor, Ohio 44060 (telephone 216-354-2600).

            No person is authorized to give any information or to make any
representation not contained in this Prospectus or in the documents incorporated
or deemed to be incorporated herein by reference in connection with the
solicitation and the offering made hereby, and, if given or made, such
information or representation should not be relied upon as having been
authorized by STERIS. This Prospectus does not constitute an offer to sell, or a
solicitation of an offer to purchase, the securities offered by this Prospectus
in any jurisdiction in which it is unlawful to make such offer or solicitation
of an offer. Neither the delivery of this Prospectus nor any distribution of the
securities made under this Prospectus shall, under any circumstances, create an
implication that the information contained herein is correct as of any time
subsequent to the date hereof.


<PAGE>   5



                                  RISK FACTORS

            The Shares offered hereby are speculative in nature and involve a
high degree of risk. In addition to the other information set forth in this
Prospectus (including the information set forth in the documents incorporated
herein by reference), the following factors should be considered carefully by
prospective investors in evaluating an investment in the Shares offered by this
Prospectus.

            On May 13, 1996, STERIS Acquisition Corporation, a Delaware
corporation and a wholly-owned subsidiary of STERIS merged (the "Merger") with
and into AMSCO International, Inc., a Delaware corporation ("AMSCO") with AMSCO
being the surviving corporation in the Merger. As a result of the Merger,
AMSCO became a wholly-owned subsidiary of STERIS. Although AMSCO will continue
to be operated as a separate entity under its own name, the operating results
and financial condition of AMSCO will be reflected in the future in the
consolidated financial statements of STERIS, its parent company. The operating
results and financial condition of STERIS after the Merger will be based on the
operations of STERIS and all of its subsidiaries, direct or indirect.

            UNKNOWN EFFECTS OF MERGER. The Merger may have negative consequences
on the financial condition and results of operations of STERIS. These negative
consequences include (a) the possibility that STERIS may not continue its past
rapid growth, (b) the potential negative reaction of customers to the combined
operations of STERIS and AMSCO, (c) currently unanticipated difficulties that 
could arise in integrating the operations of STERIS and AMSCO, and (d) the 
possible failure to realize synergies expected from combining the operations of
AMSCO and STERIS.

            PRODUCT LIABILITY EXPOSURE. The manufacturing and marketing of
STERIS's and AMSCO's products, notably production of ethylene oxide ("EtO")
sterilizers by AMSCO, entails risks of product liability claims. If a patient
were injured during an invasive procedure and the source of the injury could be
traced either to an unsterile instrument that was processed with STERIS's or
AMSCO's products or to another product that was manufactured by STERIS or AMSCO,
STERIS or AMSCO could be subject to significant liabilities. Product liability
lawsuits have been filed from time to time against AMSCO, including by persons
alleging exposure to unsafe levels of EtO from AMSCO's sterilizers. As of
December 31, 1995, 12 product liability lawsuits related to EtO were pending
against AMSCO (including four actions in which AMSCO is the sole defendant, and
not including one action where a complaint, naming AMSCO as a co-defendant, was
filed in state court in December 1995, but was not served on AMSCO until
February 1996). A significant number of suits related to EtO have been either
dismissed or settled without a finding of liability. These settlements and the
monetary damages in the one case where a verdict was returned against AMSCO have
been nominal or have been covered by insurance.

            Product liability suits have also been filed against AMSCO by
persons claiming injury caused by AMSCO's various other products, including
non-EtO sterilizers, surgical tables and OR lights. Many of these suits have
been filed by patients, or healthcare workers allegedly injured while working
with AMSCO's products. A significant number of these suits have been either
dismissed or settled without a finding of liability. Most of these settlements
have been nominal, and all have been covered by insurance. As of December 31,
1995, 20 product

                                       -1-

<PAGE>   6



liability lawsuits unrelated to EtO were pending against AMSCO, including eight
actions and one claim (where no complaint has been filed) where AMSCO is the
sole defendant. The Company believes that a verdict rendered against AMSCO in,
or settlement of, any of these actions would be covered by insurance.

            AMSCO continues to defend itself vigorously in all of the above
actions. Although there can be no assurance that the outcome of any of these
pending lawsuits will be favorable to AMSCO, the Company believes that pending
litigation will not have a material adverse effect on AMSCO's business or
financial condition. Furthermore, there can be no assurance that additional
lawsuits will not be brought and, if brought, would not have a material adverse
effect on the Company's business, financial condition or results of operations.

            HOSPITAL CUSTOMER BASE. The domestic market for infection control
products for healthcare customers is relatively mature and the growth rate for
hospitals is flat to declining. More surgical procedures and medical treatments
are being provided in non-traditional "alternate care" sites; AMSCO does not
have a significant presence in this market segment. Current trends in the
hospital industry toward retrenchment and consolidation have had and may
continue to have adverse effects on AMSCO. The cost of a significant portion of
medical care in the United States is funded by government and private insurance
programs, such as Medicare, Medicaid, and corporate health insurance plans. In
recent years, governmentally-imposed limits on reimbursement of hospitals and
other healthcare providers, including the diagnosis-related group reimbursement
system used by Medicare, have had a significant impact on the capital spending
budgets of hospitals. Private third-party reimbursement plans are also
developing increasingly sophisticated methods of delivering healthcare. A
material decrease in current reimbursement levels for purchases of capital
equipment could adversely affect future sales of AMSCO's products.

            GOVERNMENT REGULATION. Many of AMSCO's and STERIS's products and
manufacturing processes are subject to regulation by the Federal Drug
Administration (the "FDA"), the United States Environmental Protection Agency
(the "EPA"), and other governmental authorities. Similar regulatory agencies
exist in other countries with a wide variety of regulatory review processes and
procedures. AMSCO's and STERIS's respective products are also subject to review
or certification by various non-governmental certification authorities,
including Underwriters' Laboratories, Canadian Standards Association, ASME and
TUV/VDE (Europe). Domestic and foreign government regulatory and certification
authorities may delay or prevent product introductions, require additional
studies or tests prior to product introduction, require product modifications
or recalls, or mandate cessation of production and marketing of existing
products. The cost of compliance with applicable regulations represents a
considerable expense for each of AMSCO and STERIS and significant changes in
such regulations or in their interpretation could have a material adverse
impact.

            In the United States, the FDA regulates the introduction,
manufacturing, labeling, and recordkeeping procedures for medical devices,
including the majority of products manufactured by AMSCO and STERIS. The process
of obtaining marketing clearance from the FDA for new

                                       -2-

<PAGE>   7



products, new applications for existing products, and changes to existing
products can be time-consuming and expensive. In addition, whether separate
marketing clearance is required under applicable regulations for any particular
product is often a matter of judgment. There is no assurance that marketing
clearances will be granted, that the FDA will agree or continue to agree with
all judgments made from time to time by AMSCO and STERIS with respect to whether
or not marketing clearance is required for any particular new or existing
product, or that FDA review will not involve delays that would adversely affect
AMSCO's and STERIS's ability to commercialize additional products or additional
applications for existing products. Similar approvals by comparable agencies are
required in most foreign countries. Foreign regulatory requirements may vary
widely from country to country. The time required to obtain market clearance
from a foreign country may be longer or shorter than that required by the FDA or
other such agencies, and clearance or approval or other product requirements may
differ.

            Even if regulatory approvals to market a product are obtained from
the FDA or comparable foreign agencies, these approvals may entail limitations
on the indicated uses of the product. Product approvals granted by the FDA or
comparable foreign agencies can also be withdrawn due to failure to comply with
regulatory standards or the occurrence of unforeseen problems following initial
approval. The FDA could also limit or prevent the manufacture or distribution of
AMSCO's or STERIS's products and has the power to require the recall of such
products. FDA regulations depend heavily on administrative interpretation, and
there can be no assurance that future interpretations made by the FDA or other
regulatory bodies, with possible retroactive effect, will not adversely affect
AMSCO or STERIS. Further, additional government regulation may be established
that could prevent, delay, or result in the rejection of, regulatory approval of
AMSCO's or STERIS's products. The effect of government regulation that may arise
from future legislation or administrative action cannot be predicted.

            The FDA, various state agencies, and foreign regulatory agencies
also have the right to inspect AMSCO's and STERIS's facilities from time to time
to determine whether AMSCO and STERIS are in compliance with various regulations
relating to good manufacturing practices ("GMP Regulations"), validation,
testing, quality control, and product labeling. In complying with GMP
Regulations, manufacturers must continue to expend time, money, and effort in
the areas of production and quality control in order to ensure full technical
compliance.

            Failure to comply with any applicable regulatory requirements could
result in sanctions being imposed on AMSCO or STERIS, including warning letters,
injunctions, civil money penalties, failure of the FDA or comparable foreign
agencies to grant premarket clearance or premarket approval of medical devices,
product recalls, operating restrictions, and, in extreme cases, criminal
sanctions.

            In addition, both STERIS and AMSCO are and may be subject to
regulation under state, federal, and foreign law regarding occupational safety,
environmental protection, and hazardous and toxic substance control, and to
other present and possible future local, state, federal, and foreign regulation.


                                       -3-

<PAGE>   8



            During the third quarter of 1994, the FDA conducted an inspection of
AMSCO's hydrogen peroxide vapor sterilizer pre-market notifications submitted
under Section 510(k) of the Federal Food Drug and Cosmetic Act ("510(k)
notifications"). In connection with this inspection, AMSCO was notified by the
FDA on January 20, 1995 that the FDA has applied its Application Integrity
Policy to AMSCO. Consequently, pre-market approval applications and 510(k)
notifications submitted by AMSCO will not be reviewed by the FDA until AMSCO has
completed certain corrective actions to the satisfaction of the FDA, including
audits of certain previously cleared 510(k) notifications that are being
conducted by a regulatory consultant retained by AMSCO. In addition to the
audits specified by the FDA, AMSCO elected to audit certain additional 510(k)
notifications. The audits finalized to date have identified certain corrective
actions that AMSCO has completed or will complete during 1996. The Company
cannot predict how long 510(k) notifications filed by AMSCO will not be reviewed
by the FDA. The Company believes that there are no material product
introductions planned for 1996 that require pre-market clearance. AMSCO has
entered into discussions with the FDA regarding steps necessary for the FDA to
resume its review of 510(k) notifications filed by AMSCO. AMSCO recorded
reserves of approximately $3,250,000 at December 31, 1994 to cover the estimated
costs of the FDA review, including corrective actions to be completed. Charges
against these reserves amounted to $1,509,000 in 1994 and 1995, leaving residual
reserves of $1,741,000 at December 31, 1995. These residual reserves are
intended primarily to cover professional consulting, legal and other fees
expected to be incurred in connection with the completion of the corrective
actions.

            As a consequence of these corrective actions and given the
experience of other companies subject to the Application Integrity Policy, it is
more likely than not that the FDA will refer this matter to the Department of
Justice (the "DOJ") and that the DOJ will pursue sanctions, including, but not
limited to, fines and/or criminal sanctions. The Company cannot predict, at this
time, the impact on the Company or on AMSCO of this continuing FDA review or
corrective actions resulting therefrom, or the financial or other effect any
fines or sanctions could have on the business, the consolidated financial
position or the results of operations of the Company. In the event the DOJ
pursues sanctions, the DOJ could apply certain guidelines that, if strictly
adhered to, could result in any such fines and/or sanctions being material;
however, the Company believes that there are mitigating factors that, when
considered, could result in any such fines and/or sanctions not being material.

            Subject to the matters with respect to AMSCO described above, the
Company believes that it is currently in conformity in all material respects
with all regulatory requirements. It is, however, possible that the FDA would
disagree with these beliefs and seek to apply one or more of the remedies
available to it under applicable law as described above, which could have a
material adverse effect on the Company. The Company is committed to maintaining
compliance with all applicable FDA, EPA, and other governmental laws and
regulations.

            PATENT PROTECTION. The Company considers certain of the patents held
by STERIS and its subsidiaries to be significant to the Company's business.
There can be no assurance,

                                       -4-

<PAGE>   9



however, that any patent will provide adequate protection for the technology or
product it covers. In addition, the process of obtaining and protecting patents
can be long and expensive.

            COMPETITION. Although the nature of the market environment varies
somewhat among lines of business, each area of business is very competitive and
certain competitors of the Company have greater financial and other resources
than the Company. The research, scientific, and industrial market for
decontamination products is fragmented. The Company has competitors on a
national scale for its service lines of business, as well as a multitude of
competitors in specific geographic markets, including factory-trained
technicians employed by the specific equipment manufacturers. Some existing and
potential customers also choose to utilize in-house service employees. In
addition, a number of companies have developed and introduced disposable medical
instruments and other devices designed to address the risk of contamination.

            INSURANCE COVERAGE. Although the Company currently maintains general
liability insurance coverage that it believes to be adequate for the continued
operation of its business, such insurance is expensive and may become difficult
to obtain or unobtainable in the future on acceptable terms. In addition, the
amount and scope of current or future coverage may be inadequate to protect the
Company in the event of, for example, successful product liability,
environmental, or other actions.

            ENVIRONMENTAL MATTERS. AMSCO has been identified by the EPA as one
of approximately 50 potentially responsible parties ("PRPs") within the meaning
of the Comprehensive Environmental Response, Compensation and Liability Act of
1980 (the "Superfund Act") with respect to a Superfund Act site near Erie,
Pennsylvania (the "Site"). Costs to remediate the Site are estimated by the
government to be approximately $24 million. In 1989, the government commenced a
civil action under the Superfund Act (the "Cost Recovery Suit") to recover the
cost of response actions previously undertaken at the Site by the EPA and the
EPA's contractors. The EPA alleges that its past costs are approximately $13
million. AMSCO and other PRPs were named as third-party defendants and then as
direct defendants in the Cost Recovery Suit. AMSCO and nine other PRPs are in
the final stages of concluding a settlement with the EPA regarding the Cost
Recovery Suit. It is estimated that the work needed to complete the remediation
of the Site will cost between $10 million and $13 million. In 1992, the EPA
issued a unilateral administrative order (the "Administrative Order") to 37
PRPs, including AMSCO, to complete the remediation of the Site. AMSCO, together
with 19 other named PRPs, have formed a group to coordinate efforts to respond
to the EPA's unilateral Administrative Order.

            Also, in 1993, the Pennsylvania Department of Environmental
Resources, now known as the Pennsylvania Department of Environmental Protection
(the "PaDEP") commenced a civil action against the PRPs including AMSCO, seeking
recovery of the PaDEP's costs with respect to the Site and a declaration of
liability with respect to future costs (the "PaDEP Suit"). In 1995, AMSCO and
nine other PRPs settled the PaDEP Suit. Further detail regarding the Cost
Recovery Suit, Administrative Order, and the PaDEP Suit are contained in
AMSCO's Annual Report on Form 10-K for the fiscal year ended December 31, 1995
filed with the Commission on March 26, 1996.

                                       -5-

<PAGE>   10



Although the Company believes that the resolution of its liability with
respect to the Site will not have a material adverse effect on the Company,
there can be no assurance that its ultimate liability will not exceed its
current expectations.

                                   THE COMPANY

            STERIS markets, develops, manufactures, distributes and services
infection control, decontamination, and surgical products for the worldwide
healthcare market.

            STERIS's products address a number of trends in the healthcare
industry: the growth in numbers and types of minimally invasive procedures (such
as laparoscopic cholecystectomy and colonoscopy) that use delicate and expensive
devices; heightened public and professional concern regarding the transmission
of infectious diseases such as AIDS, hepatitis, and tuberculosis; the growth in
the provision of healthcare services in non-hospital settings; and concern
regarding the handling and disposal of biohazardous materials. These trends have
expanded the demand for rapid, safe, and efficient infection prevention systems
for critical tasks such as sterile processing of devices and the handling,
decontamination, destruction, and disposal of potentially infectious
biohazardous waste.

            The fundamental technology of STERIS is the rapid, safe, low
temperature chemical destruction of microorganisms on inanimate surfaces. STERIS
focused its initial development of this technology on sterile processing
applications in the healthcare industry, such as the sterile processing of heat
sensitive sophisticated devices used for minimally invasive surgical and
diagnostic procedures. Recently announced products utilizing anti-microbial
chemistry technology address the safe handling of potentially infectious solid
and fluid waste at or near the point of generation.

            STERIS's principal product line is STERIS SYSTEM 1, a complete
system for just-in-time sterile processing at or near the site of patient care.
STERIS has recently introduced two new product lines into the market: Eco Cycle
10 and Safe Cycle 40. Each of STERIS's product lines are conceptually similar.
Each system addresses a specific infection prevention challenge. The components
of each system include a processor priced at under $20,000, accessories designed
to increase the versatility of each system, processing chambers, a proprietary
single use chemical package, and a variety of supplies and consumables. The only
installation requirements for all systems are tap water, electricity, and a
drain. All systems are easy to use, have relatively short processing cycles, and
are designed to be installed and economically operated at or near the site of
patient care.

            STERIS was incorporated in Ohio in 1985 as Innovative Medical
Technologies Corporation. In 1987 the Company was renamed STERIS Corporation.
Its principal executive offices are located at 5960 Heisley Road, Mentor, Ohio
44060 and its telephone number is (216) 354-2600.


                                       -6-

<PAGE>   11



            In January, 1996, STERIS acquired all of the capital stock of
Ecomed, Inc., a privately held company located in Indianapolis, Indiana
("Ecomed"). Prior to the acquisition, STERIS owned a minority interest in the
outstanding stock of Ecomed. Ecomed previously worked jointly with STERIS under
a business development agreement to produce ECOCYCLE 10(TM), a low-cost
biohazardous waste destruction and decontamination system. With the acquisition,
STERIS obtained all rights on a worldwide basis to Ecomed's proprietary
technology and to the manufacture and distribution of ECOCYCLE 10. On January
31, 1996, Ecomed employed 23 people. The purchase price was not material.

                             RECENT DEVELOPMENTS

            On May 13, 1996, STERIS Acquisition Corporation, a Delaware
corporation and a wholly-owned subsidiary of STERIS merged (the "Merger") with
and into AMSCO International, Inc., a Delaware corporation ("AMSCO") with AMSCO
the surviving corporation in the Merger. As a result of the Merger, AMSCO became
a wholly-owned subsidiary of STERIS.

            In the pro forma balance sheet prepared in connection with the
Merger and filed as part of the Company's Registration Statement on Form S-4
(Registration Number 333-1610), the Company set forth an estimated restructuring
charge in the amount of $65,986,000 of which $38,311,000 is not deductible for
income taxes.  The restructuring charge results from costs to be incurred in
connection with (i) eliminating redundant assets, (ii) executive employment
agreements and other planned employee severance, (iii) write-off of goodwill
related to Finn-Aqua operations, and (iv) other Merger-related activities. The
Company continues to evaluate these matters and anticipates taking charges with
respect to these matters in the first quarter of fiscal 1997.

            AMSCO develops, manufactures, markets, distributes, and services
infection control, decontamination, and surgical products. AMSCO's infection
control and decontamination products, which include sterilizers, washing
equipment, accessories, and related consumable items are used by hospital,
research, scientific, and industrial professionals to prevent the spread of
infectious diseases and biological contamination. AMSCO's general surgical
tables, lights, and stainless steel OR products are used by healthcare providers
in both hospital and non-hospital surgical settings. AMSCO complements its
equipment businesses by providing repair and maintenance services. AMSCO's
approximately 900-member field service organization provides OEM repair and
maintenance for AMSCO's infection control, decontamination, and surgical
equipment, as well as third-party repair, maintenance, and management service
for a wide variety of types and makes of medical equipment installed primarily
in hospitals.

            AMSCO manufactures steam sterilizers, which use saturated steam to
sterilize items through a combination of heat, moisture, and pressure. For those
items that are unable to withstand the high temperatures, pressures, and
humidity that are associated with steam sterilization, AMSCO provides EtO gas
sterilizers, which can be used at low temperatures, pressures, and humidity. In
addition, AMSCO has a line of infection control equipment using hydrogen
peroxide vapor for use in the research, scientific, and industrial market. AMSCO
also manufactures and distributes infection control consumables used to monitor
sterilization and decontamination processes or to control the spread of
infectious diseases. Such products include biological indicators designed to
monitor the effectiveness of steam and EtO sterilization processes; disinfecting
and washing products, such as detergents and surface antiseptic solutions;
sterility maintenance products, such as bagging and pouching products; personnel
safety and monitoring products, such as AMSCO's EtO safety badge; and the
DART(R) daily air removal test product, a pre-assembled, disposable test device
developed by AMSCO to ensure accurate sterilizer cycle confirmation.

            A complaint, purporting to be a class action on behalf of the
stockholders of AMSCO, was filed in the Chancery Court of the State of
Delaware, New Castle County on December 22, 1995. The complaint names AMSCO,
STERIS, and each of the directors of AMSCO, except Richard A. Gilleland, as
defendants. The complaint alleges, among other things, that (a) the AMSCO Board
breached its fiduciary duties in considering and approving the Merger, (b) the
STERIS Board aided and abetted the alleged breach of fiduciary duties by the
AMSCO Board, (c) the AMSCO Board did not negotiate a provision related to the
conversion ratio ensuring that the stockholders receive adequate consideration
in the event of a significant drop in the price of STERIS Common Shares or
permitting AMSCO to terminate the Merger without having to pay a termination
fee to STERIS if the price of STERIS Common Shares dropped significantly, and
(d) the consideration offered to AMSCO stockholders was inadequate because,
under the terms of the Merger, STERIS could acquire AMSCO Common Stock for less
than its market price prior to the announcement of the Merger due to (i) the
terms of the Merger providing for a fixed conversion ratio and (ii) a decrease
in the value of STERIS Common Shares following the announcement. The Company
believes that the complaint is without merit and intends to vigorously defend
the action. On February 12, 1996, AMSCO and the director defendants filed an
Answer, a Motion to Dismiss, a Brief in Support of the Motion to Dismiss, and a
Motion to Stay Discovery with the court.


                                     -7-

<PAGE>   12




                             SELLING SHAREHOLDER

            The Selling Shareholder is Richard A. Gilleland. Mr. Gilleland was
President  and Chief Executive Officer of AMSCO prior to the Merger. Mr.
Gilleland is no longer an officer or director of either AMSCO or STERIS. Mr.
Gilleland is a party to three separate stock option agreements each dated as of
July 11, 1995 and entered into by AMSCO (the "Stock Option Agreements"). As a   
result of the Merger, all the options outstanding under the Stock Option
Agreements were assumed by STERIS and were converted into options to purchase
STERIS Common Shares. 690,000 of the Shares offered hereby are issuable by
STERIS upon the exercise of Mr. Gilleland's options.

            In addition, Mr. Gilleland is a party to a Restricted Stock
Agreement, dated as of July 11, 1995, with AMSCO. As a result of the Merger,
all of the restricted stock awarded to Mr. Gilleland under the Restricted
Stock Agreement were converted into STERIS Common Shares. 37,938 of the Shares
offered hereby are Shares owned by Mr. Gilleland as a result of the award of
restricted stock under the Restricted Stock Agreement.

            As of the date of this prospectus, Mr. Gilleland beneficially owns
727,938 shares of STERIS Common Stock. This represents 2% of the STERIS Common
Shares which would have been outstanding immediately following the Merger if all
of the common stock of AMSCO outstanding on the date of the Merger were
converted to STERIS Common Shares pursuant to the terms of the Merger. Upon
completion of the offering, assuming all of the Shares offered hereby are sold
and that no other changes in the Selling Shareholders' beneficial ownership
occur prior to completion of this offering, the Selling Shareholder will not
beneficially own any STERIS Common Shares.

                       PLAN OF DISTRIBUTION/SALE OF SHARES

            The sale of the Shares by the Selling Shareholder may be affected
from time to time in transactions in the open market, in negotiated transactions
or through a combination of such methods of sale, at fixed prices, which may be
changed, at market prices prevailing at the time of sale, at prices related to
such prevailing market prices or at negotiated prices. The Selling Shareholder
may effect such transactions by selling the Shares to or through broker-dealers,
and any such broker-dealers may receive compensation in the form of discounts,
concessions or commissions from the Selling Shareholder and/or the purchasers of
the Shares for which such broker-dealers may act as agents or to whom they sell
as principals, or both (which compensation as to a particular broker-dealer may
be in excess of customary compensation).

            The Selling Shareholder and any broker-dealers who act in connection
with the sale of the Shares hereunder may be deemed to the "underwriters" within
the meaning of Section 2(11) of the Securities Act, and any commissions received
by them and profit on any resale of the Shares as principals might be deemed to
be underwriting discounts and commissions under the Securities Act.

                                       -8-

<PAGE>   13




            The Company is bearing all of the costs relating to the registration
of the Shares. Any commissions, discounts or other fees payable to a
broker-dealer in connection with the sale of any of the Shares will be borne by
the Selling Shareholder.

                                  LEGAL MATTERS

            The legality of the shares of Common Stock offered hereby has been
passed upon for the Company by Thompson Hine & Flory P.L.L., 3900 Key Center, 
127 Public Square, Cleveland, Ohio 44114. Attorneys at Thompson Hine &
Flory P.L.L. owned approximately 1,400 STERIS Common Shares on April 1, 1996.

                                     EXPERTS

            The consolidated financial statements of STERIS as of March 31, 1995
and 1994 and for each of the three years in the period ended March 31, 1995
incorporated by reference in this Prospectus have been audited by Ernst & Young
LLP, independent auditors, as stated in their report thereon. The financial
statements audited by Ernst & Young LLP have been incorporated herein by
reference in reliance upon their report given upon their authority as experts in
accounting and auditing.

            The consolidated financial statements of AMSCO as of December 31,
1995 and 1994 and for each of the three years in the period ended December 31,
1995, incorporated by reference in this Prospectus have been audited by Arthur
Andersen LLP, independent public accountants, as indicated in their report with
respect thereto, and are incorporated by reference herein in reliance upon the
authority of said firm as experts in accounting and auditing in giving said
reports.

                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

                   OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

            The following items, except for the SEC registration fee, are
estimated. The Registrant has agreed to bear all expenses (other than selling
commissions) in connection with the registration and sale of the Shares.


                                       -9-

<PAGE>   14



<TABLE>
<S>                                                                                     <C>      
         Registration fee to the Securities and
           Exchange Commission.......................................................   $ 8,283.43

         Accounting fees and expenses................................................   $10,000  
         Legal fees and expenses.....................................................   $10,000  
         Blue Sky Filing fees and expenses...........................................   $ 2,500   
         Printing and Mailing expenses...............................................   $   500  
         Miscellaneous expenses......................................................   $ 3,000  

              Total..................................................................   $34,283.43
</TABLE>


                    INDEMNIFICATION OF DIRECTORS AND OFFICERS

         The Company is an Ohio corporation. Under Ohio Law, Ohio corporations
are permitted to indemnify directors, officers, employees, and agents within
prescribed limits and must indemnify them under certain circumstances. Ohio Law
does not authorize the payment by a corporation of judgments against a director,
officer, employee, or agent after a finding of negligence or misconduct in a
derivative suit absent a court order determining that such person is fairly and
reasonably entitled to indemnification. Indemnification is required, however, to
the extent such person succeeds on the merits. In all other cases, if it is
determined that a director, officer, employee, or agent acted in good faith and
in a manner he reasonably believed to be in or not opposed to the best interest
of the corporation, indemnification is discretionary except as otherwise
provided by a corporation's articles of incorporation, code of regulations, or
contract, except with respect to the advancement of expenses of directors.

         The STERIS Regulations provide that STERIS will, in all actions other
than derivative actions, indemnify any director, officer, employee, or agent of
STERIS, or any person serving as a director, trustee, officer, employee, or
agent of another entity at the request of STERIS, against expenses (including
attorneys' fees), judgments, fines and amounts paid in settlement actually and
reasonably incurred by him in connection with the action, suit, or proceeding
unless it is proved by clear and convincing evidence that his action or failure
to act involved an act or omission undertaken with deliberate intent to cause
injury to STERIS or undertaken with reckless disregard for the best interests of
STERIS. With respect to derivative actions, the STERIS Regulations provide that
STERIS will indemnify any director, officer, employee, or agent of STERIS, or
any person serving as a director, officer, employee, or agent of another entity
at the request of STERIS, against expenses actually and reasonably incurred in
the defense and settlement of the action unless it is proved by clear and
convincing evidence that his action or failure to act involved an act or
omission undertaken with deliberate intent to cause injury to STERIS or
undertaken with reckless disregard for the best interests of STERIS.
Notwithstanding the proceeding sentence, STERIS will indemnify such directors,
officers, employees, and agents in a derivative action if the court in which the
action was brought determines that, despite the proof but in view of all the
circumstances of the case, he is fairly and reasonably entitled to indemnity for
such expenses as the court shall deem proper.

                                      -10-

<PAGE>   15




         The statutory right to indemnification is not exclusive in Ohio, and
Ohio corporations may, among other things, purchase insurance to indemnify those
person. the STERIS Regulations likewise provide that STERIS amy purchase
insurance to indemnify directors, officers, employees, or agents of STERIS.

         With respect to the advancement of expenses, Ohio Law provides that a
director (but not an officer, employee, or agent) is entitled to mandatory
advancement of expenses, including attorneys' fees, incurred in defending any
action, including derivative actions, brought against the director, provided
that the director agrees to cooperate with the corporation concerning the matter
and to repay the amount advanced if it is proven by clear and convincing
evidence that his act or failure to act was done with deliberate intent to cause
injury to the corporation or with reckless disregard for the corporation's best
interests. The STERIS Regulations provide that STERIS will advance expenses to a
director (unless the action or suit is one in which the liability of the
director under Section 1701.95 of the Ohio Law is the only liability asserted),
officer, employee, or agent of STERIS is defending any actions, suit, or
proceeding, whether derivative or otherwise, provided that such director,
officer, employee, or agent agrees to both (a) repay the amount advanced if it
is proven by clear and convincing evidence that his or her action or failure to
act involved an act or omission undertaken with deliberate intent to cause
injury to STERIS or undertaken with reckless disregard for the best interests of
STERIS and (b) to cooperate with STERIS concerning the action, suit, or
proceeding.


                                    EXHIBITS

         Reference is made to the Exhibit Index.


                                      -11-

<PAGE>   16



                                  UNDERTAKINGS

          (a)  The undersigned Registrant hereby undertakes:

               (1) To file, during any period in which offers or sales are being
made, a post-effective amendment to this Registration Statement;

               (i) To include any prospectus required by Section 10(a)(3) of the
Securities Act;

               (ii) To reflect in the prospectus any facts or events arising
after the effective date of the Registration Statement (or the most recent
post-effective amendment thereof) which, individually or in the aggregate,
represent a fundamental change in the information set forth in the Registration
Statement. Notwithstanding the foregoing, any increase or decrease in volume of
securities offered (if the total dollar value of securities offered would not
exceed that which was registered) and any deviation from the low or high and of
the estimated maximum offering range may be reflected in the form of prospectus
filed with the Commission pursuant to Rule 424(b) if, in the aggregate, the
changes in volume and price represent no more than 20 percent change in the
maximum aggregate offering price set forth in the "Calculation of Registration
Fee" table in the effective registration statement.

               (iii) To include any material information with respect to the
plan of distribution not previously disclosed in the Registration Statement or
any material change to such information in the Registration Statement;

provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the
information required to be included in a post-effective amendment by those
paragraphs is contained in periodic reports filed with or furnished to the
Commission by the Registrant pursuant to Section 13 or 15(d) of the Exchange Act
that are incorporated by reference in the Registration Statement.

               (2) That, for the purpose of determining any liability under the
Securities Act, each such post-effective amendment shall be deemed to be a new
Registration Statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

               (3) To remove from registration by means of a post-effective
amendment any of the securities being registered which remain unsold at the
termination of the offering.

          (b) The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act, each filing of the  
Registrant's annual report pursuant to Section 13(a) or 15(d) of the  Exchange
Act (and, where applicable, each filing of an employee benefit plan's annual
report pursuant to Section 15(d) of the Exchange Act that is incorporated by
reference in the Registration Statement shall be deemed to be a new
Registration Statement relating to the securities offered therein, and the

                                      -12-

<PAGE>   17


offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

          (h) Insofar as indemnification for liabilities arising under the
Securities Act may be permitted to directors, officers, and controlling persons
of the Registrant pursuant to the foregoing provisions, or otherwise, the
Registrant has been advised that in the opinion of the Commission such
indemnification is against public policy as expressed in the Securities Act and
is, therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by the Registrant of expenses
incurred or paid by a director, officer, or controlling person of the
Registrant in the successful defense of any action, suit or proceeding) is
asserted by such director, officer, or controlling person in connection with
the securities being registered, the Registrant will, unless in the opinion of
its counsel the matter has been settled by controlling precedent, submit to a
court of appropriate jurisdiction the question whether such indemnification by
it is against public policy as expressed in the Securities Act and will be
governed by the final adjudication of such issue.



                                      -13-

<PAGE>   18




                                   SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, the
registrant certifies that it has reasonable grounds to believe that it meet all
of the requirements for filing on Form S-3 and has duly caused this Registration
Statement to be signed in its behalf by the undersigned, thereunto duly
authorized, in the County of Lake, State of Ohio, on June 18, 1996.

                                       STERIS CORPORATION



                                       By:  /s/ Michael A. Keresman, III
                                            --------------------------------
                                            Michael A. Keresman, III
                                            Senior Vice President,
                                            Chief Financial Officer
                                            and Secretary


          Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed below by the following persons in the
capacities and on the dates indicated.

<TABLE>
<CAPTION>
               Title and Description                                                             Date
               ---------------------                                                             ----
<S>                                                                                          <C>
Bill R. Sanford, Chairman of the Board, President,                                           June 18, 1996
Chief Executive Officer, and Director (Principal
Executive Officer); Michael A. Keresman, III, Senior
Vice President, Chief Financial Officer, and Secretary
(Principal Financial and Accounting Officer), Russell
L. Carson, Director, Raymond A. Lancaster, Director,
Thomas J. Magulski, Director, J.B. Richey, Director,
Jerry E. Robertson, Ph.D, Director, Frank E. Samuel,
Jr., Director, Loyal W. Wilson, Director.
</TABLE>



                                       By:  /s/ Michael A. Keresman, III
                                            --------------------------------
                                            Michael A. Keresman, III
                                            Attorney-in-Fact



                                      -14-

<PAGE>   19



                               STERIS CORPORATION
                                    FORM S-3
                             REGISTRATION STATEMENT
                                INDEX TO EXHIBITS
<TABLE>
<CAPTION>
 FORM
  S-3
EXHIBIT
  NO.                           DESCRIPTION
- -------                         -----------

<S>      <C>                                                            <C>
4.1      Specimen form of Common Stock Certificate.                     Incorporated herein by reference to Exhibit 4.5 to
                                                                        Amendment No. 1 to the Registration Statement
                                                                        on Form S-1 filed April 23, 1992.

4.2      1992 Amended Articles of Incorporation                         
         of STERIS Corporation as amended by the                        
         1996 Amendment.                                                Located at sequential page 21.              

4.3      1992 Amended Regulations of STERIS                             Incorporated herein by reference to Exhibit
         Corporation                                                    3(a).4(b) to Form 10-Q filed for the quarter ended
                                                                        June 30, 1992.

4.4      Registration Rights Agreement, dated as of                     Incorporated herein by reference to Exhibit 10.1
         April 26, 1988.                                                to the Registration Statement on Form S-1 filed
                                                                        March 30, 1992.

4.5      First Amendment to Registration Rights                         Incorporated herein by reference to Exhibit 10.2
         Agreement, dated as of March 9, 1989.                          to the Registration Statement on Form S-1 filed
                                                                        March 30, 1992.

4.6      Second Amendment to Registration Rights                        Incorporated herein by reference to Exhibit 10.3
         Agreement, dated as of May 13, 1991.                           to the Registration Statement on Form S-1 filed
                                                                        March 30, 1992.

5.1      Opinion of Thompson Hine & Flory P.L.L. as                     Located at sequential page 31
         to the legality of the securities to be
         registered.

15.1     Letter of Arthur Andersen re:  
         Unaudited Interim Financial Information                        Located at sequential page 33

23.1     Consent of Ernst & Young LLP                                   Located at sequential page 34

23.2     Consent of Arthur Andersen LLP                                 Located at sequential page 35

23.3     Consent of Thompson Hine & Flory P.L.L.                        --
         (included as part of Exhibit 5.1).


24.1     Powers of Attorney.                                            Located at sequential page 36
</TABLE>

                                      -15-


<PAGE>   1
                                                                    Exhibit 4.2


                     1992 AMENDED ARTICLES OF INCORPORATION
                             OF STERIS CORPORATION
                        AS AMENDED BY THE 1996 AMENDMENT

          FIRST. The name of the Corporation is Steris Corporation.

          SECOND. The place in the State of Ohio where the principal office of
     the Corporation is located is the City of Mentor, in Lake County.

          THIRD. The purpose or purposes for which the Corporation is formed are
     to engage in any lawful act or activity for which corporations may be
     formed under Chapter 1701 of the Ohio Revised Code.

          FOURTH. The authorized number of shares of the Corporation is
     103,000,000, of which 100,000,000 shall be Common Shares, without par value
     (the "Common Shares"), and 3,000,000 shall be Serial Preferred Shares,
     without par value (the "Serial Preferred Shares").

                  EXPRESS TERMS OF THE SERIAL PREFERRED SHARES

SECTION 1. SERIES.

     The Serial Preferred Shares may be issued from time to time in series. All
Serial Preferred Shares shall be of equal rank and the express terms thereof
shall be identical, except in respect of the terms that may be fixed by the
Board of Directors as hereinafter provided, and each share of each series shall
be identical with all other shares of such series, except that in the case of
series on which dividends are cumulative the dates from which dividends are
cumulative may vary to reflect differences in the dates of issue. Subject to the
provisions of Section 2 through 7, inclusive, of these Express Terms of Serial
Preferred Shares, which shall apply to all Serial Preferred Shares, the Board of
Directors is hereby authorized to cause Serial Preferred Shares to be issued in
one or more series and with respect to each such series to fix:

          (a) The designation of the series, which may be by distinguishing
     number, letter or title.

          (b) The authorized number of shares of the series, which number the
     Board of Directors may, except to the extent otherwise provided in the
     creation of the series, from time to time, increase or decrease, but not 
     below the number of shares thereof then outstanding.
<PAGE>   2

          (c) The dividend rate or rates (which may be fixed or adjustable) of
     the shares of the series.

          (d) The dates on which dividends, if declared, shall be payable, and
     in the case of series on which dividends are cumulative, the dates from
     which dividends shall be cumulative.

          (e) The redemption rights and price or prices, if any, for shares of
     the series.

          (f) The amount, terms, conditions and manner of operation of any
     retirement or sinking fund to be provided for the purchase or redemption of
     shares of the series.

          (g) The amounts payable on shares of the series in the event of any
     liquidation, dissolution or winding up of the affairs of the Corporation.

          (h) Whether the shares of the series shall be convertible into Common
     Shares or shares of any other series or class, and, if so, the
     specification of such other class or series, the conversion price or prices
     or rate or rates, any adjustment thereof, and all other terms and
     conditions upon which such conversion may be made.

          (i) The restrictions, if any, upon the issue of any additional shares
     of the same series or any other class or series.

     The Board of Directors is authorized to adopt from time to time amendments
to these articles of incorporation fixing, with respect to each series, the
matters described in Clauses (a) through (i), inclusive, of this Section 1.

SECTION 2. DIVIDENDS.

          (a) The holders of Serial Preferred Shares of each series, in 
     preference to the holders of Common Shares and of any other class of 
     shares ranking junior to the Serial Preferred Shares, shall be entitled 
     to receive out of any funds legally available and when and as declared


                                       2

<PAGE>   3

by the Board of Directors dividends in cash at the rate for such series fixed in
accordance with the provisions of Section 1 of these Express Terms of Serial
Preferred Shares and no more, payable on the dividend payment dates fixed for
such series. Such dividends shall be cumulative, in the case of shares of a
series on which dividends are cumulative, from and after the date or dates fixed
with respect to such series. No dividend shall be paid upon or declared and set
apart for any series of the Serial Preferred Shares for any current dividend
period unless:

          (i) as to each series of Serial Preferred Shares entitled to
     cumulative dividends, and any other class of shares entitled to cumulative
     dividends, or series thereof, dividends for all past dividend periods shall
     have been paid or shall have been declared and a sum sufficient for the
     payment thereof set apart; and

          (ii) as to all series of Serial Preferred Shares, and any other class
     of shares, or series thereof, ranking on a parity with the Serial Preferred
     Shares, dividends for the current dividend period shall have been paid or
     be or have been declared and a sum sufficient for the payment thereof set
     apart ratably in accordance with the amounts which would be payable as
     dividends on those shares for the current dividend period if all dividends
     for the current period were declared and paid in full.

No dividend in respect of past dividend periods shall be paid upon or declared
and set apart for payment for any series of the Serial Preferred Shares entitled
to cumulative dividends unless there shall be or have been declared and set
apart for payment on all outstanding series of Serial Preferred Shares entitled
to cumulative dividends, and any other class of shares entitled to cumulative
dividends, or series thereof, ranking on a parity with the Serial Preferred
Shares, dividends for past dividend periods ratably in accordance with the
amounts which would be payable on those shares entitled to cumulative dividends
if all dividends due for all past dividend periods were declared and paid in
full.

     (b) So long as any Serial Preferred Shares shall be outstanding, no
dividend, except a dividend payable in Common Shares or other shares ranking
junior to the Serial Preferred Shares, shall be paid or declared or any
distribution be made, except as aforesaid, on the Common Shares or any other


                                       3
<PAGE>   4

shares ranking junior to the Serial Preferred Shares, nor shall any Common      
Shares or any other shares ranking junior to the Serial Preferred Shares, be
purchased, retired or otherwise acquired by the Corporation or any sinking fund
payment with respect to any other shares of the Corporation be made (except out
of the proceeds of the sale of Common Shares or any other shares ranking junior
to the Serial Preferred Shares received by the Corporation on or subsequent to
the date on which Serial Preferred Shares are first issued) unless, in each
case:

          (i) all dividends as to all series of Serial Preferred Shares entitled
     to cumulative dividends for past dividend periods shall have been declared
     and paid or a sum sufficient for payment thereof set apart;

          (ii) all dividends as to all series of Serial Preferred Shares for the
     current dividend period shall have been declared and paid or a sum
     sufficient for payment thereof set apart; and

          (iii) there shall be no default with respect to the redemption of
     Serial Preferred Shares of any series from, and no default with respect to
     any required payment into, any sinking fund provided for shares of such
     series in accordance with the provisions of Section 1 of these Express
     Terms of Serial Preferred Shares.

SECTION 3. REDEMPTION.

         (a) Subject to the express terms of each series of Serial Preferred
Shares, the Corporation may from time to time redeem all or any part of the
Serial Preferred Shares of any series at the time outstanding which is
redeemable (i) at the option of the Board of Directors at the applicable
redemption price for such series fixed in accordance with the provisions of
Section 1 of these Express Terms of Serial Preferred Shares, or (ii) in
fulfillment of the requirements of any sinking fund provided for shares of such
series at the applicable sinking fund redemption price fixed in accordance with
the provisions of Section 1 of these Express Terms of Serial Preferred Shares,
together in each case with (1) all then unpaid dividends upon such shares
payable on all dividend payment dates for such series occurring on or prior to
the redemption date, plus (2) if the redemption date is not a dividend payment
date for such series, a proportionate dividend, based upon the number of elapsed
days, for the period from the day following the most recent such dividend
payment date through the redemption date.


 

                                        4



<PAGE>   5

                (b) Notice of every such redemption shall be mailed, postage
prepaid, to the holders of record of the Serial Preferred Shares to be redeemed
at their respective addresses then appearing on the books of the Corporation,
not less than 30 days nor more than 60 days prior to the date fixed for such
redemption. At any time after notice has been given as above provided and
before the date of redemption specified in such notice, the Corporation may
deposit the aggregate redemption price of the Serial Preferred Shares to be
redeemed, together with an amount equal to the aggregate amount of the
dividends payable upon such redemption, with any bank or trust company in
Cleveland, Ohio or New York, New York having capital, surplus and undivided
profits aggregating at least of more than $50,000,000, named in such notice, and
direct that such deposited amount be paid to the respective holders of the
Serial Preferred Shares so to be redeemed upon surrender of the stock
certificate or certificates held by such holders. After the mailing of such
notice and the making of such deposit of money such holders shall cease to be
shareholders with respect to such shares and shall have no interest in or claim
against the Corporation with respect to such shares, except only the right to
receive such money from such bank or trust company without interest or to
exercise, before the redemption date, any unexpired privileges of conversion.

                (c) In the event less than all of the outstanding shares of any
series of Serial Preferred Shares are to be redeemed, the Corporation shall
select pro rata or by lot the shares so to be redeemed in such manner as shall
be prescribed by the Board of Directors.

                (d) If the holders of Serial Preferred shares which shall have
been called for redemption shall not, within six years after such deposit,
claim the amount deposited for the redemption thereof, any such bank or trust
company shall, upon demand, pay over to the Corporation such unclaimed amounts
and thereupon such bank and the Corporation shall be relieved of all
responsibility in respect thereof and to such holders.

                (e) Any Serial Preferred Shares (i) redeemed by the Corporation
pursuant to the provisions of this Section 3, (ii) purchased and delivered in
satisfaction of any sinking fund requirements provided for shares of any series
of Serial Preferred Shares, (iii) converted in accordance with the express terms
of any such series, or (iv) otherwise acquired by the Corporation, shall resume
the status of authorized and unissued Serial Preferred Shares without serial
designation.



                                      5
<PAGE>   6

SECTION 4.  LIQUIDATION.

                (a) The holders of Serial Preferred Shares of any series shall,
in case of liquidation, dissolution or winding up of the affairs of the
Corporation, be entitled to receive in full out of the assets of the
Corporation, including its capital, before any amount shall be paid or
distributed among the holders of Common Shares or any other shares ranking
junior to the Serial Preferred Shares, the amounts fixed with respect to shares
of such series in accordance with Section 1 of these Express Terms of Serial
Preferred Shares, plus an amount equal to (i) all then unpaid dividends upon
such shares payable on all dividend payment dates for such series occurring on
or prior to the date of payment of the amount due pursuant to such liquidation,
dissolution or winding up, plus (ii) if such date is not a dividend payment
date for such series, a proportionate dividend, based on the number of elapsed
days, for the period from the day following the most recent such dividend
payment date through such date of payment of the amount due pursuant to such
liquidation, dissolution or winding up. In case the net assets of the
Corporation legally available therefor are insufficient to permit the payment
upon all outstanding Serial Preferred Shares of the full preferential amount to
which they are respectively entitled, then such assets shall be distributed
ratably upon outstanding Serial Preferred Shares and any other class of shares,
or series thereof, on a parity with the Serial Preferred Shares in proportion to
the full preferential amount to which each such share is entitled.

                After payment to holders of Serial Preferred Shares of the full
preferential amounts as aforesaid, holders of Serial Preferred Shares as such
shall have no right or claim to any of the remaining assets of the Corporation.

                (b) The merger or consolidation of the Corporation with or into
any other corporation, or the merger of any other corporation into it, or the
sale, lease, or conveyance of all or substantially all the property or business
of the Corporation shall not be deemed to be a dissolution, liquidation or
winding up for the purposes of this Section 4.

                                      6
<PAGE>   7
SECTION 5. VOTING RIGHTS.

                (a) The holders of Serial Preferred Shares shall be entitled to
one vote for each Serial Preferred Share held by them, respectively, on each
matter properly submitted to shareholders for their vote, consent, waiver,
release or other action; and, except as otherwise provided in this Section 5 or
required by law, the holders of Serial  Preferred Shares and holders of Common
Shares shall vote together as one class on all matters.

                (b) The affirmative vote or consent of the holders of at least
a majority of the then outstanding Serial Preferred Shares, given in person or
by proxy, either in writing or at a meeting called for the purpose at which the
holders of Serial Preferred Shares shall vote separately as a class, shall be
necessary to effect any one or more of the following (but so far as the holders
of Serial Preferred Shares are concerned, such action may be effected with such
vote or consent):

                (i) Any amendment, alteration or repeal of any of the
       provisions of these articles of incorporation or the regulations of the
       Corporation which would be substantially prejudicial to the voting
       powers, rights or preferences of the holders of Serial Preferred Shares;
       provided, however, that for the purpose of this clause (i) only, neither
       the amendment of these articles of incorporation to authorize or to
       increase the authorized or outstanding number of shares of any class
       ranking junior to the Serial Preferred Shares, nor the amendment of the
       regulations so as to change the number of directors of the Corporation
       shall be deemed to be substantially prejudicial to the voting powers,
       rights or preferences of the holders of Serial Preferred Shares; and
       provided further that if such amendment, alteration or repeal would be
       substantially prejudicial to the rights or preferences of one or more
       but not all then outstanding series of Serial Preferred Shares, only the
       affirmative vote or consent of the holders of at least a majority of the
       then outstanding shares of the series so affected shall  be required;

                (ii) The authorization, or the increase in the authorized
       number of, any shares of any class ranking prior to or on a parity 
       with the Serial Preferred Shares;
<PAGE>   8

                        (iii)  The purchase or redemption for sinking fund 
         purposes or otherwise of less than all of the then outstanding
         Serial Preferred Shares except in accordance with a purchase offer
         made to all holders of record of Serial Preferred Shares, unless all
         dividends on all Serial Preferred Shares then outstanding for all
         previous dividend periods shall have been declared and paid or funds
         therefor set apart and all accrued sinking fund obligations
         applicable thereto shall have been complied with; or

                        (iv)  An increase in the authorized number of Serial
         Preferred Shares.

SECTION 6.      PREEMPTIVE RIGHTS.

                        No holder of Serial Preferred Shares shall be entitled
as such as a matter of right to subscribe for or purchase any part of any issue
of shares of the Corporation, of any class whatsoever, or any part of any issue
of securities convertible into shares of the Corporation, of any class
whatsoever, and whether issued for cash, property, services or otherwise.

SECTION 7.      DEFINITIONS.

                        For the purposes of these Express Terms of
                        Serial Preferred Shares:

                        (a)  Whenever reference is made to shares "ranking prior
to the Serial Preferred Shares," such reference shall mean and include all
shares of the Corporation in respect of which the rights of the holders thereof
either as to the payment of dividends or as to distribution in the event of a
liquidation, dissolution or winding up of the Corporation are given preference
over the rights of the holders of Serial Preferred Shares.

                        (b)  Whenever reference is made to shares "on a parity
with the Serial Preferred Shares," such reference shall mean and include all
shares of the Corporation in respect of which the rights of the holders thereof
as to the payment of dividends or as to distributions in the event of a
liquidation, dissolution or winding up of the Corporation rank on an equality
with the rights of the holders of Serial Preferred Shares.


                                      8
<PAGE>   9
                (c)  Whenever reference is made to shares "ranking junior to
the Serial Preferred Shares," such reference shall mean and include all shares
of the Corporation in respect of which the rights of the holders thereof as to
the payment of dividends and as to distributions in the event of a
liquidation, dissolution or winding up of the Corporation are junior or
subordinate to the rights of the holders of Serial Preferred Shares.

                FIFTH.  The Corporation, by action of its directors, and
without action of its shareholders, may purchase its own shares, of any class,
in accordance with the provisions of Chapter 1701 of the Ohio Revised Code. 
Such purchases may be made either in the open market or at public or private
sale, in such manner and amounts, from such holder or holders of outstanding
shares of the Corporation, of any class, and at such prices as the directors
shall from time to time determine.

                SIXTH.  A director or officer of the Corporation shall
not be disqualified by his office from dealing or contracting with the
Corporation as a vendor, purchaser, employee, agent, or otherwise, nor shall
any contract or transaction be void or voidable with respect to the
Corporation for the reason that it is between the Corporation and one or more
of its directors or officers, or between the Corporation and any other person
in which one or more of its directors or officers are directors, trustees, or
officers, or have a financial or personal interest, or for the reason that one
or more interested directors or officers participate in or vote at the meeting
of the directors or a committee thereof that authorizes such contract or
transaction, if in any such case (a) the material facts as to his or their
relationship or interest and as to the contract or transaction are disclosed or
are known to the directors or the committee and the directors or committee, in
good faith reasonably justified by such facts, authorizes the contract or
transaction by the affirmative vote of a majority of the disinterested
directors constitute less than a quorum; or (b) the material facts as to his or
their relationship or interest and as to the contract or transaction are
disclosed or are known to the shareholders entitled to vote thereon and the
contract or transaction is specifically approved at a meeting of the
shareholders held for such purpose by the affirmative vote of the holders of
shares entitling them to exercise a majority of the voting power of the
Corporation held by persons not interested in the contract or transaction; or
(c) the contract or transaction is fair as to the Corporation as of the time it
is authorized or approved by the directors, a committee thereof, or the
shareholder.

                                      9

<PAGE>   10

                SEVENTH.  Notwithstanding any provision in Chapter 1701 of the
Ohio Revised Code requiring for any purpose the vote, consent, waiver, or
release of the holders of a designated proportion (but less than all) of the
voting shares or power of the Corporation, the vote, consent, waiver, or
release of the holders of a majority of the voting shares of the Corporation
regardless of class shall be sufficient to constitute the required
authorization or approval for any such purpose.  In the event that any
provision of these articles of incorporation, the regulations of the
Corporation, or law requires for any purpose the vote, consent, waiver, or
release of the holders of a designated proportion (but less than all) of the
shares of the Corporation of any particular class or classes acting separately
as a class, the vote, consent, waiver, or release of the holders of a majority
of the shares of such class or of each such classes, as the case may be, shall
be sufficient to constitute the required authorization or approval for any such
purpose, notwithstanding any contrary provision of Chapter 1701 of the Ohio
Revised Code.

                EIGHTH.  No holder of shares of the Corporation, of any class,
as such, shall have any preemptive right to purchase or subscribe for shares of
the Corporation, of any class, or other securities of the Corporation, of any
class, whether now or hereafter authorized.

                NINTH.  These 1992 Amended Articles of Incorporation supersede
the 1991 Amended Articles of Incorporation of the Corporation, as heretofore
amended.  

                TENTH.  Section 1701.831 of the Ohio Revised Code shall not
apply to control share acquisitions of shares of the corporation. 
Notwithstanding anything to the contrary in these Articles of Incorporation, to
amend or add to or repeal this Article TENTH shall require the affirmative vote
at a meeting of holders of shares entitled to exercise 75% of the voting power
on such proposal, unless such action is recommended by two-thirds of the
members of the Board of Directors.



                                      10

<PAGE>   1
                                                                     Exhibit 5.1


June 18, 1996

                                                                    216-566-5500


STERIS Corporation
5960 Heisley Road
Mentor, Ohio 44060-1868


Gentlemen:

As counsel for STERIS Corporation ("STERIS"), we are familiar with the
Registration Statement on Form S-3 (the "Registration Statement") to be filed by
STERIS with the Securities and Exchange Commission (the "Commission") under the
Securities Act of 1933, as amended, with respect to 727,938 Common Shares,
without par value, of STERIS to be registered for resale by the Selling
Shareholder (as defined in the Registration Statement). In addition, we have
acted as counsel to STERIS in connection with the May 13, 1996, merger of STERIS
Acquisition Corporation ("SAC") with and into AMSCO International, Inc.
("AMSCO") with AMSCO being the surviving corporation in the merger.

In connection with the above, we have examined the Amended Articles of
Incorporation and the Code of Regulations of STERIS and such other records of
corporate proceedings and such other documents, and such questions of law, as we
deem necessary to examine as a basis for the opinions hereinafter expressed. We
have reviewed the form of Registration Statement on Form S-3 (including exhibits
thereto) proposed to be filed with the Commission. In addition, we have
examined the Restated Agreement and Plan of Merger, dated as of December 16,
1995 and restated as of March 28, 1996, by and among STERIS, SAC, and AMSCO and
related documents. As to matters of facts relevant to our opinion, to the extent
deemed appropriate, we have relied upon representations of officers of STERIS
and upon certificates of public officials as to matters stated therein.
Furthermore, we have assumed the capacity to sign and the genuineness of the
signatures of all persons executing agreements, instruments, or documents
examined or relied upon by us.

Based upon the foregoing and legal matters that we deem relevant, we are of the
opinion that the 37,938 Common Shares held by the Selling Shareholder pursuant
to the Restricted Stock Agreement (as defined in the Registration Statement)
have been duly authorized, legally issued and are fully paid and nonassessable.
With respect to the 690,000 Common Shares issuable upon exercise of the options
outstanding


<PAGE>   2
STERIS Corporation                                                   Exhibit 5.1
June 18, 1996
Page 2


pursuant to the Stock Option Agreements (as defined in the Registration
Statement), we are of the opinion that such shares are  duly authorized and
when issued in accordance with the terms of the Stock  Option Agreements (as
defined in the Registration Statement), will be legally issued, fully
paid and nonassessable.

The information set forth herein is as of the date hereof. We assume no
obligation to advise you of changes that may hereafter be brought to our
attention. Our opinion is based on statutory laws and judicial decisions that
are in effect on the date hereof, and we do not opine with respect to any law,
regulation, rule, or governmental policy that may be enacted or adopted after
the date hereof, nor do we assume any responsibility to advise you of future
changes in our opinion. This opinion is solely for your information in
connection with the registration of the Common Shares with the Commission and is
not to be quoted in whole or in part or otherwise referred to in any of
STERIS's financial statements or other public releases, nor is it to be filed
with any governmental agency or other person without the prior written consent
of this firm. This letter may not be relied upon by any other person or for any
other purposes whatsoever.

We hereby consent to the use of this opinion as an exhibit to STERIS's
Registration Statement as filed with the Commission in connection with the
registration of the Common Shares on Form S-3 and to the use of our name therein
under the caption "Legal Matters".

Very truly yours,



 MLP/dk


<PAGE>   1


                                                                Exhibit 15.1



June 17, 1996

Mr. Michael A. Keresman
Chief Financial Officer
STERIS Corporation
5960 Heisley Road
Mentor, Ohio  44060-1868





Dear Mr. Keresman:

We are aware that STERIS Corporation has incorporated by reference in its
Registration Statement on Form S-3 the AMSCO International, Inc. Form 10-Q for
the quarter ended March 31, 1996, which includes our report dated April 10,
1996, covering the unaudited interim financial information contained therein. 
Pursuant to Regulation C of the Securities Act of 1933, that report is not
considered a part of the registration statement prepared or certified by our
firm or a report prepared or certified by our firm within the meaning of
Sections 7 and 11 of the Act.



ARTHUR ANDERSEN LLP

<PAGE>   1

                                                                Exhibit 23.1


                       CONSENT OF INDEPENDENT AUDITORS




We consent to the reference to our firm under the caption "Experts" in the
Registration Statement (Form S-3) and related Prospectus of STERIS Corporation
for the registration of 727,938 Common Shares and to the incorporation by
reference therein of our report dated April 18, 1995, with respect to the
consolidated financial statements of STERIS Corporation included in its Annual
Report (Form 10-K) for the year ended March 31, 1995, filed with the Securities
and Exchange Commission.


                                                ERNST & YOUNG LLP

Cleveland, Ohio
June 19, 1996

<PAGE>   1
                                                                    Exhibit 23.2


                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

As independent public accountants, we hereby consent to the incorporation by
reference in this Registration Statement (Form S-3) of STERIS Corporation of our
report dated January 31, 1996 (except with respect to the matter discussed in
Note 18, as to which the date is March 21, 1996) included in the AMSCO
International, Inc. Form 10-K for the year ended December 31, 1995, and to all
references to our Firm included in this registration statement.


Pittsburgh, Pennsylvania
June 17, 1996                                                ARTHUR ANDERSEN LLP

<PAGE>   1


                                                                    Exhibit 24.1

                               STERIS CORPORATION
                               ------------------

                                POWER OF ATTORNEY
                                -----------------


               The undersigned, an officer or director, or both an officer and
director of STERIS Corporation ("STERIS"), an Ohio corporation, which
anticipates filing with the Securities and Exchange Commission, Washington, D.C.
under the provisions of the Securities Act of 1933, as amended, a Registration
Statement on Form S-3, with respect to the resale by Mr. Gilleland of 727,938
STERIS Common Shares which were authorized for issuance in connection with the
transactions consummated on May 13, 1996 in accordance with the Agreement and
Plan of Merger, dated December 16, 1995 between STERIS and AMSCO International,
Inc., hereby constitutes and appoints Bill R. Sanford, Michael A. Keresman, III
and Roy L. Turnell, and each of them, as attorney for the undersigned, with full
power of substitution and resubstitution, for and in the name, place, and stead
of the undersigned, to sign and file the proposed Registration Statement and any
and all amendments, post-effective amendments, and exhibits thereto, and any and
all applications and other documents to be filed with the Securities and
Exchange Commission pertaining to such securities or such registration with full
power and authority to do and perform any and all acts and things whatsoever
requisite and necessary to be done in the premises, hereby ratifying and
approving the acts of such attorney or any such substitute or substitutes.

               IN WITNESS WHEREOF, the undersigned has hereunto set his or her
hand as of June 5, 1996.



                               /s/ Bill R. Sanford
                               -------------------------------




<PAGE>   2


                                                                    Exhibit 24.1

                               STERIS CORPORATION
                               ------------------

                                POWER OF ATTORNEY
                                -----------------


               The undersigned, an officer or director, or both an officer and
director of STERIS Corporation ("STERIS"), an Ohio corporation, which
anticipates filing with the Securities and Exchange Commission, Washington, D.C.
under the provisions of the Securities Act of 1933, as amended, a Registration
Statement on Form S-3, with respect to the resale by Mr. Gilleland of 727,938
STERIS Common Shares which were authorized for issuance in connection with the
transactions consummated on May 13, 1996 in accordance with the Agreement and
Plan of Merger, dated December 16, 1995 between STERIS and AMSCO International,
Inc., hereby constitutes and appoints Bill R. Sanford, Michael A. Keresman, III
and Roy L. Turnell, and each of them, as attorney for the undersigned, with full
power of substitution and resubstitution, for and in the name, place, and stead
of the undersigned, to sign and file the proposed Registration Statement and any
and all amendments, post-effective amendments, and exhibits thereto, and any and
all applications and other documents to be filed with the Securities and
Exchange Commission pertaining to such securities or such registration with full
power and authority to do and perform any and all acts and things whatsoever
requisite and necessary to be done in the premises, hereby ratifying and
approving the acts of such attorney or any such substitute or substitutes.

               IN WITNESS WHEREOF, the undersigned has hereunto set his or her
hand as of June 5, 1996.



                              /s/ Russell L. Carson
                              -------------------------------



<PAGE>   3


                                                                    Exhibit 24.1

                               STERIS CORPORATION
                               ------------------

                                POWER OF ATTORNEY
                                -----------------


               The undersigned, an officer or director, or both an officer and
director of STERIS Corporation ("STERIS"), an Ohio corporation, which
anticipates filing with the Securities and Exchange Commission, Washington, D.C.
under the provisions of the Securities Act of 1933, as amended, a Registration
Statement on Form S-3, with respect to the resale by Mr. Gilleland of 727,938
STERIS Common Shares which were authorized for issuance in connection with the
transactions consummated on May 13, 1996 in accordance with the Agreement and
Plan of Merger, dated December 16, 1995 between STERIS and AMSCO International,
Inc., hereby constitutes and appoints Bill R. Sanford, Michael A. Keresman, III
and Roy L. Turnell, and each of them, as attorney for the undersigned, with full
power of substitution and resubstitution, for and in the name, place, and stead
of the undersigned, to sign and file the proposed Registration Statement and any
and all amendments, post-effective amendments, and exhibits thereto, and any and
all applications and other documents to be filed with the Securities and
Exchange Commission pertaining to such securities or such registration with full
power and authority to do and perform any and all acts and things whatsoever
requisite and necessary to be done in the premises, hereby ratifying and
approving the acts of such attorney or any such substitute or substitutes.

               IN WITNESS WHEREOF, the undersigned has hereunto set his or her
hand as of June 5, 1996.
               --


                               /s/ Raymond A. Lancaster
                               -------------------------------



<PAGE>   4


                                                                    Exhibit 24.1

                               STERIS CORPORATION
                               ------------------

                                POWER OF ATTORNEY
                                -----------------


               The undersigned, an officer or director, or both an officer and
director of STERIS Corporation ("STERIS"), an Ohio corporation, which
anticipates filing with the Securities and Exchange Commission, Washington, D.C.
under the provisions of the Securities Act of 1933, as amended, a Registration
Statement on Form S-3, with respect to the resale by Mr. Gilleland of 727,938
STERIS Common Shares which were authorized for issuance in connection with the
transactions consummated on May 13, 1996 in accordance with the Agreement and
Plan of Merger, dated December 16, 1995 between STERIS and AMSCO International,
Inc., hereby constitutes and appoints Bill R. Sanford, Michael A. Keresman, III
and Roy L. Turnell, and each of them, as attorney for the undersigned, with full
power of substitution and resubstitution, for and in the name, place, and stead
of the undersigned, to sign and file the proposed Registration Statement and any
and all amendments, post-effective amendments, and exhibits thereto, and any and
all applications and other documents to be filed with the Securities and
Exchange Commission pertaining to such securities or such registration with full
power and authority to do and perform any and all acts and things whatsoever
requisite and necessary to be done in the premises, hereby ratifying and
approving the acts of such attorney or any such substitute or substitutes.

               IN WITNESS WHEREOF, the undersigned has hereunto set his or her
hand as of June 5, 1996.
               --


                               /s/ Thomas J. Magulski
                               -------------------------------



<PAGE>   5


                                                                    Exhibit 24.1

                               STERIS CORPORATION
                               ------------------

                                POWER OF ATTORNEY
                                -----------------


               The undersigned, an officer or director, or both an officer and
director of STERIS Corporation ("STERIS"), an Ohio corporation, which
anticipates filing with the Securities and Exchange Commission, Washington, D.C.
under the provisions of the Securities Act of 1933, as amended, a Registration
Statement on Form S-3, with respect to the resale by Mr. Gilleland of 727,938
STERIS Common Shares which were authorized for issuance in connection with the
transactions consummated on May 13, 1996 in accordance with the Agreement and
Plan of Merger, dated December 16, 1995 between STERIS and AMSCO International,
Inc., hereby constitutes and appoints Bill R. Sanford, Michael A. Keresman, III
and Roy L. Turnell, and each of them, as attorney for the undersigned, with full
power of substitution and resubstitution, for and in the name, place, and stead
of the undersigned, to sign and file the proposed Registration Statement and any
and all amendments, post-effective amendments, and exhibits thereto, and any and
all applications and other documents to be filed with the Securities and
Exchange Commission pertaining to such securities or such registration with full
power and authority to do and perform any and all acts and things whatsoever
requisite and necessary to be done in the premises, hereby ratifying and
approving the acts of such attorney or any such substitute or substitutes.

               IN WITNESS WHEREOF, the undersigned has hereunto set his or her
hand as of June 5, 1996.
               --


                               /s/ J.B. Richey
                               -------------------------------



<PAGE>   6


                                                                    Exhibit 24.1

                               STERIS CORPORATION
                               ------------------

                                POWER OF ATTORNEY
                                -----------------


               The undersigned, an officer or director, or both an officer and
director of STERIS Corporation ("STERIS"), an Ohio corporation, which
anticipates filing with the Securities and Exchange Commission, Washington, D.C.
under the provisions of the Securities Act of 1933, as amended, a Registration
Statement on Form S-3, with respect to the resale by Mr. Gilleland of 727,938
STERIS Common Shares which were authorized for issuance in connection with the
transactions consummated on May 13, 1996 in accordance with the Agreement and
Plan of Merger, dated December 16, 1995 between STERIS and AMSCO International,
Inc., hereby constitutes and appoints Bill R. Sanford, Michael A. Keresman, III
and Roy L. Turnell, and each of them, as attorney for the undersigned, with full
power of substitution and resubstitution, for and in the name, place, and stead
of the undersigned, to sign and file the proposed Registration Statement and any
and all amendments, post-effective amendments, and exhibits thereto, and any and
all applications and other documents to be filed with the Securities and
Exchange Commission pertaining to such securities or such registration with full
power and authority to do and perform any and all acts and things whatsoever
requisite and necessary to be done in the premises, hereby ratifying and
approving the acts of such attorney or any such substitute or substitutes.

               IN WITNESS WHEREOF, the undersigned has hereunto set his or her
hand as of June 5, 1996.
               --


                               /s/ Jerry E. Robertson, Ph.D.
                               -------------------------------



<PAGE>   7


                                                                    Exhibit 24.1

                               STERIS CORPORATION
                               ------------------

                                POWER OF ATTORNEY
                                -----------------


               The undersigned, an officer or director, or both an officer and
director of STERIS Corporation ("STERIS"), an Ohio corporation, which
anticipates filing with the Securities and Exchange Commission, Washington, D.C.
under the provisions of the Securities Act of 1933, as amended, a Registration
Statement on Form S-3, with respect to the resale by Mr. Gilleland of 727,938
STERIS Common Shares which were authorized for issuance in connection with the
transactions consummated on May 13, 1996 in accordance with the Agreement and
Plan of Merger, dated December 16, 1995 between STERIS and AMSCO International,
Inc., hereby constitutes and appoints Bill R. Sanford, Michael A. Keresman, III
and Roy L. Turnell, and each of them, as attorney for the undersigned, with full
power of substitution and resubstitution, for and in the name, place, and stead
of the undersigned, to sign and file the proposed Registration Statement and any
and all amendments, post-effective amendments, and exhibits thereto, and any and
all applications and other documents to be filed with the Securities and
Exchange Commission pertaining to such securities or such registration with full
power and authority to do and perform any and all acts and things whatsoever
requisite and necessary to be done in the premises, hereby ratifying and
approving the acts of such attorney or any such substitute or substitutes.

               IN WITNESS WHEREOF, the undersigned has hereunto set his or her
hand as of June 5, 1996.
               --


                               /s/ Frank E. Samuel, Jr.
                               -------------------------------



<PAGE>   8


                                                                    Exhibit 24.1

                               STERIS CORPORATION
                               ------------------

                                POWER OF ATTORNEY
                                -----------------


               The undersigned, an officer or director, or both an officer and
director of STERIS Corporation ("STERIS"), an Ohio corporation, which
anticipates filing with the Securities and Exchange Commission, Washington, D.C.
under the provisions of the Securities Act of 1933, as amended, a Registration
Statement on Form S-3, with respect to the resale by Mr. Gilleland of 727,938
STERIS Common Shares which were authorized for issuance in connection with the
transactions consummated on May 13, 1996 in accordance with the Agreement and
Plan of Merger, dated December 16, 1995 between STERIS and AMSCO International,
Inc., hereby constitutes and appoints Bill R. Sanford, Michael A. Keresman, III
and Roy L. Turnell, and each of them, as attorney for the undersigned, with full
power of substitution and resubstitution, for and in the name, place, and stead
of the undersigned, to sign and file the proposed Registration Statement and any
and all amendments, post-effective amendments, and exhibits thereto, and any and
all applications and other documents to be filed with the Securities and
Exchange Commission pertaining to such securities or such registration with full
power and authority to do and perform any and all acts and things whatsoever
requisite and necessary to be done in the premises, hereby ratifying and
approving the acts of such attorney or any such substitute or substitutes.

               IN WITNESS WHEREOF, the undersigned has hereunto set his or her
hand as of June 5, 1996.
               --


                               /s/ Loyal W. Wilson
                               -------------------------------




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