Revolving Credit And Term Loan Agreement

Exhibit 10.12.4

February 9, 2005

Enpath Medical, Inc.

Attn: Mike Erdmann

15301 Highway 55 West

Minneapolis, MN 55447

Dear Mr. Erdmann:

Pursuant to the provisions of Section 5.1(f) of the Revolving Credit And Term Loan Agreement (the “Loan Agreement”) dated October 17, 2003, the Borrower agreed it would maintain Tangible Net Worth of not less than $10,000,000 at December 31, 2004.

Pursuant to the provisions of Section 5.1(g) of the Loan Agreement and as amended via Letter Amendment No. 1 dated March 18, 2004 and Letter Amendment No. 2 dated July 19, 2004, the Borrower agreed it would main