The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 02, 2001
Filed:
Apr. 05, 1999
Nandkishor G. Patke, Shoreview, MN (US);
Adel A. Mikhail, Bloomington, MN (US);
Gene E. Stobbs, Brooklyn Park, MN (US);
Medical CV, Inc., Inver Grove Heights, MN (US);
Abstract
A bileaflet heart valve comprising an annular base and pivoting leaflets. Each leaflet is “free-floating” within recesses without fixed rotational axis in order to increase translational movement and redistribute stresses. Each recess fluidly communicates with a groove extending at least partially around the inner surface of the annular base and fluid flow is directed through the recesses at different angles during antegrade circulation, retograde circulation, and valve closure. A recess entrance angle to each of the recesses in certain embodiments is preferably less than about 35° and the pivoting mechanism within each recess includes first and second fulcrum edges of each leaflet shiftably engaged with side surfaces of the respective recesses. The leaflets have a beveled bottom side having two separate planar surfaces which lie at an angle to one another. In certain embodiments, an up planar surface of the bottom surface of each leaflet lies at an angle of greater than ninety (90) degrees with respect to a horizontal plane passing through a horizontal cross-section of the annular base when the leaflet is in a fully open position. In preferred embodiments, the angle between the top surface and upper bottom surface is about 2 to about 8 degrees.