SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13D


                    Under the Securities Exchange Act of 1934
                                (Amendment No. 3)


                       Meridian Medical Technologies, Inc.
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                                (Name of Issuer)

                          COMMON STOCK, $.10 par value
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                         (Title of Class of Securities)

                                   589658103
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                                 (CUSIP Number)


       Robert G. Foster, 4 Milk Street, Portland, ME 04101 (207) 780-0904
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(Name, Address, Telephone  Number of Persons Authorized  to  Receive Notices and
Communications)

                                  April 1, 2002
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             (Date of Event which Requires Filing of this Statement)


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

Note: Six copies of this statement, including all exhibits, should be filed with
the  Commission.  See Rule  13d-1(a) for other  parties to whom copies are to be
sent.


                                Page 1 of   Pages

     1        NAME OF REPORTING PERSON
              S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSON

              Commonwealth Bioventures, Inc.

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     2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*        (a) [ ]
                                                                       (b) [X]

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     3        SEC USE ONLY

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     4        SOURCE OF FUNDS*

              Not Applicable
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     5        CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS              [ ]
              REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)


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     6        CITIZENSHIP OR PLACE OF ORGANIZATION                 Massachusetts

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      NUMBER OF SHARES                   7          SOLE VOTING POWER
 BENEFICIALLY OWNED BY EACH
   REPORTING PERSON WITH                                 0
                                ------------------------------------------------
                                         8          SHARED VOTING POWER

                                                         48,271
                                ------------------------------------------------
                                         9          SOLE DISPOSITIVE POWER

                                                         0
                                ------------------------------------------------
                                        10          SHARED DISPOSITIVE POWER

                                                         48,271
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     11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

               48,271
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     12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
               SHARES*                                                     [ ]

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     13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

               1.1%
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     14        TYPE OF REPORTING PERSON*

               CO
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Schedule 13D                                       Commonwealth Bioventures Inc.


ITEM 2.  IDENTITY AND BACKGROUND.

     The  reporting   person's  name  is  Commonwealth   BioVentures,   Inc.,  a
Massachusetts corporation.  The reporting person's principal business is that of
general partner of BioVenture Partners Limited  Partnership,  a Delaware limited
partnership,  which  is the  general  partner  of  two  venture  capital  funds,
Commonwealth BioVentures IV Limited Partnership,  a Delaware limited partnership
("Fund IV"),  and  Commonwealth  BioVentures V Limited  Partnership,  a Delaware
limited  partnership ("Fund V"). The President and principal  stockholder of CBI
is Robert Foster, a U.S. citizen.  The business address for each of the entities
and the individual identified above is 4 Milk Street, Portland, ME 04101.

     During  the  last  five  years,  none  of the  entities  or the  individual
identified  in the  paragraph  above  have  been  (i)  convicted  in a  criminal
proceeding  (excluding  traffic  violations and similar  misdemeanors) or (ii) a
party to a civil  proceeding of a judicial or  administrative  body of competent
jurisdiction  and as a result of such  proceeding  has been or is  subject  to a
judgment,  decree or final order enjoining future  violations of, or prohibiting
or mandating  activities subject to, federal or state securities laws or finding
any violation with respect to such laws.


ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER

     The number of shares of the Issuer's common stock that the reporting person
may be  deemed  to  beneficially  own is  48,271  (the  "Shares"),  representing
approximately  1.1% of the reported  outstanding  shares of the Issuer's  common
stock as of February 28, 2002. By virtue of the relationships  described in Item
2 above among the reporting  person,  Fund IV, Fund V, BVLP and Mr. Foster,  the
reporting  person  shares  the power to vote and  dispose  of (i)  10,484 of the
Shares  held in the name of Fund IV with  Fund IV,  BVLP  and Mr.  Foster,  (ii)
36,297  of the  Shares  held in the  name of Fund V with  Fund V,  BVLP  and Mr.
Foster, and (iii) 1,490 of the Shares held in the name of BVLP with BVLP and Mr.
Foster.  The reporting person ceased to be a beneficial owner of more than 5% of
the Issuer's  common stock between  November 30, 2001 and February 28, 2002 as a
result of a reported  increase in the aggregate number of outstanding  shares of
the Issuer's common stock between those two dates.

     Fund V, a venture  fund, is in its last year of existence and has commenced
liquidating  fund investments in contemplation of its termination and winding up
of its business. On April 1, 2002, Fund V distributed to its limited partners an
aggregate of 150,000 shares of the Issuer's common stock  registered in Fund V's
name in accordance with the terms of Fund V's limited partnership agreement (the
"Distribution").  The  Distribution  was  effected  solely  as part of Fund  V's
investment liquidation process and was not influenced by or otherwise based upon
the  reporting  person's  evaluation  of the  Issuer's  current  or  anticipated
business, financial, or stock price performance.





                                    SIGNATURE

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



                                               COMMONWEALTH BIOVENTURES, INC.

April 2, 2002                                  By:  /s/ Robert G. Foster
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                                                    Robert G. Foster, President