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:
Apr. 28, 1992
Filed:
May. 30, 1990
Ned H Hwang, Memphis, TN (US);
Other;
Abstract
A heart valve having a pair of leaflets of identical construction provides low pressure drop and freedom from thrombosis and hemolysis. The leaflets have flat sections wherein a pivot mechanism is incorporated and curved sections which are located downstream of the flat sections. The outflow or facing surface of each of the two leaflets is of two-dimensional, convex curvature whereas the opposite or inflow surface regions are of a composite concave-convex curvature on both sides of a central ridge which bisects the curved inflow surface section of each leaflet. The curvature of the downstream regions of each leaflet is fashioned so that a peripheral surface, which extends about the arcuate downstream edge of each leaflet, is of a substantially constant and relatively minimal thickness. As a result, not only is there extremely low boundary layer separation in the blood flowing along the surfaces of the leaflet but there is extremely low turbulence in the bloodstream just past the trailing edge which minimizes hemolysis at this point.