MEDAMICUS INC
SC 13D/A, 2000-09-28
SURGICAL & MEDICAL INSTRUMENTS & APPARATUS
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934

                                Amendment No. 2

                                 Medamicus, Inc.
--------------------------------------------------------------------------------
                                (Name of Issuer)

                                  Common Stock
--------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   584027-10-6
--------------------------------------------------------------------------------
                                 (CUSIP Number)


                               Robert T. Montague
                         Robins, Kaplan, Miller & Ciresi
                         800 LaSalle Avenue, Suite 2800
                              Minneapolis, MN 55408
                                  612-349-8500
            (Name, Address and Telephone Number of Person Authorized
                     to receive Notices and Communications)

                               September 21, 2000
--------------------------------------------------------------------------------
             (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.

*The remainder of this cover page should be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).


<PAGE>   2



                               Page 1 of ___ Pages


CUSIP No. 584027-10-6

       (1)    Names of Reporting Persons S.S. or I.R.S. Identification Nos. of
              Above Persons

                Pyramid Trading Limited Partnership 36-3723624
--------------------------------------------------------------------------------

       (2)    Check the Appropriate Box if a Member of a Group
                                                                 (a)     [ x ]
                                                                 (b)     [   ]
--------------------------------------------------------------------------------

       (3)    SEC Use Only

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

       (4)    Source of Funds

                                       WC
--------------------------------------------------------------------------------
       (5)    Check if Disclosure of Legal Proceedings is Required Pursuant to
              Items 2(d) or 2(e)                                         [    ]

--------------------------------------------------------------------------------
       (6)    Citizenship or Place of Organization

                                    Illinois
--------------------------------------------------------------------------------

  Number of       (7)      Sole Voting Power                           0  shares
Shares Bene-      --------------------------------------------------------------
 ficially         (8)      Shared Voting Power                   285,692  shares
 Owned by         --------------------------------------------------------------
Each Report-      (9)      Sole Dispositive Power                      0  shares
 ing Person       --------------------------------------------------------------
   With           (10)     Shared Dispositive Power              285,692  shares
--------------------------------------------------------------------------------
       (11)   Aggregate Amount Beneficially Owned by Each Reporting Person

                                 285,692 shares
--------------------------------------------------------------------------------
       (12)   Check if the Aggregate Amount in Row (11) Excludes Certain Shares
         [      ]
--------------------------------------------------------------------------------
       (13)   Percent of Class Represented by Amount in Row (11)
                                      6.9%

--------------------------------------------------------------------------------
       (14)   Type of Reporting Person (See Instructions)

                                   BD, PN, IV
--------------------------------------------------------------------------------




<PAGE>   3



                               Page 1 of ___ Pages


CUSIP No. 54027-10-6

       (1)    Names of Reporting Persons S.S. or I.R.S. Identification Nos. of
              Above Persons

                      Oakmont Investments, LLC 36-3996171
--------------------------------------------------------------------------------

       (2)    Check the Appropriate Box if a Member of a Group
                                                                    (a)   [   ]
                                                                    (b)   [ x ]
--------------------------------------------------------------------------------
       (3)    SEC Use Only

--------------------------------------------------------------------------------
       (4)    Source of Funds

                                       N/A
--------------------------------------------------------------------------------
       (5)    Check if Disclosure of Legal Proceedings is Required Pursuant to
              Items 2(d) or 2(e)                                          [   ]

--------------------------------------------------------------------------------
       (6)    Citizenship or Place of Organization

                                    Illinois
--------------------------------------------------------------------------------
 Number of        (7)      Sole Voting Power                           0  shares
Shares Bene-      --------------------------------------------------------------
 ficially         (8)      Shared Voting Power                   285,692  shares
 Owned by         --------------------------------------------------------------
Each Report-      (9)      Sole Dispositive Power                      0  shares
 ing Person       --------------------------------------------------------------
   With           (10)     Shared Dispositive Power              285,692  shares
--------------------------------------------------------------------------------
       (11)   Aggregate Amount Beneficially Owned by Each Reporting Person

                                 285,692 shares
--------------------------------------------------------------------------------
       (12)   Check if the Aggregate Amount in Row (11) Excludes Certain Shares
         [   ]
--------------------------------------------------------------------------------
       (13)   Percent of Class Represented by Amount in Row (11)
                                      6.9%

--------------------------------------------------------------------------------
       (14)   Type of Reporting Person (See Instructions)

                                     CO, IV
--------------------------------------------------------------------------------





<PAGE>   4



                               Page 1 of ___ Pages


CUSIP No. 584027-10-6

       (1)    Names of Reporting Persons S.S. or I.R.S. Identification Nos. of
              Above Persons

                            Daniel Asher ###-##-####
--------------------------------------------------------------------------------

       (2)    Check the Appropriate Box if a Member of a Group
                                                                    (a)   [ x ]
                                                                    (b)   [   ]
--------------------------------------------------------------------------------
       (3)    SEC Use Only

--------------------------------------------------------------------------------
       (4)    Source of Funds

                                      N/A
--------------------------------------------------------------------------------
       (5)    Check if Disclosure of Legal Proceedings is Required Pursuant to
              Items 2(d) or 2(e)                                          [   ]

--------------------------------------------------------------------------------
       (6)    Citizenship or Place of Organization

                                  United States
--------------------------------------------------------------------------------
 Number of        (7)      Sole Voting Power                          0  shares
Shares Bene-      --------------------------------------------------------------
 ficially         (8)      Shared Voting Power                  285,692  shares
 Owned by         --------------------------------------------------------------
Each Report-      (9)      Sole Dispositive Power                     0  shares
 ing Person       --------------------------------------------------------------
  With            (10)     Shared Dispositive Power             285,692  shares
--------------------------------------------------------------------------------
       (11)   Aggregate Amount Beneficially Owned by Each Reporting Person

                                 285,692 shares
--------------------------------------------------------------------------------
       (12)   Check if the Aggregate Amount in Row (11) Excludes Certain Shares
         [   ]
--------------------------------------------------------------------------------
       (13)   Percent of Class Represented by Amount in Row (11)
                                       6.9%

--------------------------------------------------------------------------------
       (14)   Type of Reporting Person (See Instructions)

                                       IN
--------------------------------------------------------------------------------



<PAGE>   5



                               Page 1 of ___ Pages


CUSIP No. 584027-10-6

       (1)    Names of Reporting Persons S.S. or I.R.S. Identification Nos. of
              Above Persons

                             Gary Kohler ###-##-####
--------------------------------------------------------------------------------

       (2)    Check the Appropriate Box if a Member of a Group
                                                                    (a)   [ x ]
                                                                    (b)   [   ]
--------------------------------------------------------------------------------
       (3)    SEC Use Only

--------------------------------------------------------------------------------
       (4)    Source of Funds

                                       PF
--------------------------------------------------------------------------------
       (5)    Check if Disclosure of Legal Proceedings is Required Pursuant to
              Items 2(d) or 2(e)                                          [   ]

--------------------------------------------------------------------------------
       (6)    Citizenship or Place of Organization

                                  United States
--------------------------------------------------------------------------------
 Number of        (7)      Sole Voting Power                     80,500 shares
Shares Bene-      --------------------------------------------------------------
 ficially         (8)      Shared Voting Power                        0 shares
 Owned by         --------------------------------------------------------------
Each Report-      (9)      Sole Dispositive Power                80,500 shares
 ing Person       --------------------------------------------------------------
   With           (10)     Shared Dispositive Power                   0 shares
--------------------------------------------------------------------------------
       (11)   Aggregate Amount Beneficially Owned by Each Reporting Person

                                 80,500 shares
--------------------------------------------------------------------------------
       (12)   Check if the Aggregate Amount in Row (11) Excludes Certain Shares
         [   ]
--------------------------------------------------------------------------------
       (13)   Percent of Class Represented by Amount in Row (11)
                                       1.9%

--------------------------------------------------------------------------------
       (14)   Type of Reporting Person (See Instructions)

                                       IN
--------------------------------------------------------------------------------




<PAGE>   6



                               Page 1 of ___ Pages


CUSIP No. 584027-10-6

       (1)    Names of Reporting Persons S.S. or I.R.S. Identification Nos. of
              Above Persons

                            Andrew Redleaf ###-##-####
--------------------------------------------------------------------------------

       (2)    Check the Appropriate Box if a Member of a Group
                                                                    (a)   [ x ]
                                                                    (b)   [   ]
--------------------------------------------------------------------------------
       (3)    SEC Use Only

--------------------------------------------------------------------------------
       (4)    Source of Funds

                                       PF
--------------------------------------------------------------------------------
       (5)    Check if Disclosure of Legal Proceedings is Required Pursuant to
              Items 2(d) or 2(e)                                          [   ]

--------------------------------------------------------------------------------
       (6)    Citizenship or Place of Organization

                                  United States
--------------------------------------------------------------------------------
 Number of        (7)      Sole Voting Power                     79,713  shares
Shares Bene-      --------------------------------------------------------------
 ficially         (8)      Shared Voting Power                        0  shares
 Owned by         --------------------------------------------------------------
Each Report-      (9)      Sole Dispositive Power                79,713  shares
 ing Person       --------------------------------------------------------------
  With            (10)     Shared Dispositive Power                   0  shares
--------------------------------------------------------------------------------
       (11)   Aggregate Amount Beneficially Owned by Each Reporting Person

                                 79,713 shares
--------------------------------------------------------------------------------
       (12)   Check if the Aggregate Amount in Row (11) Excludes Certain Shares
         [      ]
--------------------------------------------------------------------------------
       (13)   Percent of Class Represented by Amount in Row (11)
                                       1.9%

--------------------------------------------------------------------------------
       (14)   Type of Reporting Person (See Instructions)

                                       IN
--------------------------------------------------------------------------------




<PAGE>   7


                               Page 2 of ___ pages




         This Amendment No. 2 ("Amendment No. 2") amends the Statement on
Schedule 13D (the "Schedule 13D") filed on December 29, 1999 and amended by
Amendment No. 1 filed on May 1, 2000 by Pyramid Trading Limited Partnership
("PT"), Oakmont Investments, LLC, the general partner of PT ("OI"), Daniel
Asher, as Manager of OI and individually ("DA"), Gary Kohler ("GK") and Andrew
Redleaf ("AR"), (collectively the "Reporting Persons") with respect to their
beneficial ownership of common stock, par value $.01 per share ( the "Common
Stock"), of Medamicus, Inc., a Minnesota corporation (the "Company"). The
principal executive offices of the Company are located at 15301 Highway 55 West,
Plymouth, MN 55447. Items 3, 4 and 5 are hereby amended to read as follows:



<PAGE>   8



ITEM 3.           SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION

         From 06/09/00 to 09/21/00, PT purchased 49,100 additional shares of
Common Stock for an aggregate consideration of $134,425 (including brokerage
commissions) and thereby increased its holdings to a total of 285,692 shares
as of 09/26/00. PT acquired such shares using working capital.

<PAGE>   9



                            Page ____ of _____ pages

ITEM 4.  PURPOSE OF TRANSACTION

         The Reporting Persons have increased their position in the Company
based on their belief that management is also of the opinion that the Company's
stock is undervalued and that management is focused on improving shareholder
value.

ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER

         (a) As of 09/26/00, the Reporting Persons beneficially owned
the amounts of Common Stock respectively set forth below. The percentage set
forth below represents the percentage of the outstanding shares of Common Stock
based on 4,129,474 shares outstanding as of 06/30/00 as set forth in
the Company's Form 10Q-SB filed 07/31/00.

<TABLE>
<CAPTION>
        Reporting          Shares   of                   Percent of
        Person             Common Stock          Outstanding Common Stock
        ---------          ------------          ------------------------
<S>                          <C>                            <C>
        PT, OI, DA           285,692                        6.9%
        GK                    80,500                        1.9
        AR                    79,713                        1.9
 </TABLE>

         As of 09/26/00, the Reporting Persons beneficially owned an aggregate
of 445,905 shares of Common Stock.

         (b) The information set forth in Items 7 through 11 of the cover pages
hereto is incorporated herein by reference.

         (c) The information concerning transactions in the Common Stock
effected by the Reporting Persons during the past sixty (60) days is set forth
in Appendix A hereto and incorporated herein by reference. All of transactions
were open market transactions.


ITEM 6.  CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIP
         WITH RESPECT TO THE SECURITIES OF THE ISSUER

         NONE


ITEM 7.  MATERIAL TO BE FILED AS EXHIBITS

         1.       Agreement dated as of 09/27/00 by and among the signatories
                  of this Statement on Schedule 13-D with respect to its filing.


<PAGE>   10



                             Page ____ of ____ pages


                                    SIGNATURE

         After reasonable inquiry and to the best of its knowledge and belief,
the undersigned certifies that the information set forth in this statement is
true, complete and correct.


Date: September 27, 2000        PYRAMID TRADING LIMITED PARTNERSHIP
                                BY OAKMONT INVESTMENTS, LLC ITS GENERAL PARTNER


                                BY   /S/ Daniel Asher
                                     ------------------------------------------
                                         Daniel Asher,
                                         Manager, Oakmont Investments, LLC


                                OAKMONT INVESTMENTS, LLC



                                BY   /S/ Daniel Asher
                                     ------------------------------------------
                                         Daniel Asher, Manager


                                /s/ Daniel Asher
                                -----------------------------------------------
                                DANIEL ASHER



                                /s/ Gary Kohler
                                -----------------------------------------------
                                GARY KOHLER



                                /s/ Andrew Redleaf
                                -----------------------------------------------
                                ANDREW REDLEAF


<PAGE>   11
                            Page _____ of _____ pages


                                                                      APPENDIX A

             Transactions By Pyramid Trading Limited Partnership in
              Medamicus, Inc. Common Stock During the Past 60 Days

<TABLE>
<CAPTION>
Date              # of Shares Bought     Price Per Share ($)      Total Cost ($)*
----              ------------------     -------------------      ---------------
<S>               <C>                         <C>                  <C>
06/09/00                 1,700                 2.0000                 3,435.70
06/12/00                 1,500                 2.0000                 3,031.50
06/19/00                   200                 2.0000                   404.20
06/20/00                   700                 2.0000                 1,414.70
06/21/00                   300                 2.0000                   606.30
06/21/00                 2,700                 2.1250                 5,794.20
06/21/00                   500                 2.1250                 1,073.00
07/31/00                 1,000                 2.5625                 2,583.50
08/03/00                 1,100                 2.6250                 2,910.60
08/04/00                 1,300                 2.6250                 3,439.80
08/10/00                 1,500                 2.6250                 3,969.00
08/11/00                 1,500                 2.6250                 3,969.00
08/11/00                 1,500                 2.6250                 3,969.00
08/11/00                 1,500                 2.6250                 3,969.00
08/11/00                 1,500                 2.6250                 3,969.00
08/11/00                 1,500                 2.6250                 3,969.00
08/11/00                 2,100                 2.6875                 5,687.85
08/11/00                 1,500                 2.6250                 3,969.00
08/16/00                 3,000                 2.6250                 7,938.00
08/16/00                 2,100                 2.6250                 5,556.60
08/17/00                 2,500                 2.6250                 6,615.00
08/18/00                   600                 2.6250                 1,587.60
08/21/00                 1,600                 2.6250                 4,233.60
08/28/00                   500                 3.0000                 1,510.50
09/05/00                 2,500                 3.1250                 7,865.00
09/06/00                 2,000                 3.1250                 6,292.00
09/07/00                 2,000                 3.1250                 6,292.00
09/11/00                 1,200                 3.1250                 3,775.20
09/21/00                 5,000                 3.3000                16,605.00
09/21/00                 2,500                 3.1750                 7,990.00
                        ---------                                  -----------
Total                   49,100.00                                  $134,424.85
</TABLE>

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

         *Commissions included.
<PAGE>   12



                                  EXHIBIT INDEX

EXHIBIT NO.     DOCUMENT

         1        Agreement, dated as of September 27, 2000, by and among the
                  signatories of this Statement with respect to its filing.





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