exhibit 10. 23 quit claim assignment whereas, i, curtis amplatz, a citizen of the united states of america residing at 1200 juno ave., st. paul, minnesota 551116, am a named inventor of the inventions disclosed and claimed in u. s. patent nos. 5, 725, 552 and 6, 123, 715 ; am a named licensor in a license agreement between microvena corporation and frank kotula, kurt amplatz and curtis amplatz ( dated november 7, 1994 and executed by me on november 7, 1994 ) ; am a named inventor on a royalty agreement between aga medical corporation and frank kotula, curtis amplatz ( dated april 22, 1996 and executed by me on may 8, 1996 ) ; and am a named assignor of the assignment executed by me on may 8, 1996 and recorded in the patent and trademark office reel 7996, frame 0869 on may 14, 1996. whereas, aga medical corporation, a minnesota corporation having a principal place of business at 682 mendelssohn avenue, golden valley, minnesota 55427 ( hereinafter referred to as “ aga medical ” ) has asserted ownership rights in the inventions disclosed in u. s. patent application serial no. 08 / 272, 335, filed july 8, 1994 ; the inventions disclosed and claimed in u. s. patent nos. 5, 725, 552 and 6, 123, 715 ; the license agreement between microvena corporation and frank kotula, kurt amplatz and curtis amplatz dated november 7, 1994 ; the royalty agreement between aga medical corporation and frank kotula, curtis amplatz dated april 22, 1996 ; and the assignment executed on may 8, 1996 and recorded in the patent and trademark office reel 7996, frame 0869 on may 14, 1996 ; and whereas, the parties to this quit claim assignment wish to resolve certain ownership issues in the inventions disclosed in u. s. patent application serial no. 08 / 272, 335, filed july 8, 1994 ; the inventions disclosed and claimed in u. s. patent nos. 5, 725, 552 and 6, 123, 715 ; the license agreement between microvena corporation and frank kotula, kurt amplatz and curtis amplatz dated november 7, 1994 ; the royalty agreement between aga medical corporation and frank kotula, curtis amp