Cardiovascular prosthetic devices and implants with porous systems
First Claim
1. A heart valve structure comprising an occluder, an occluder seating ring and occluder guide means, each of said occluder seating ring and occluder guide means being constructed of metal inert to blood and consisting of a dense rigid, coherent metal substrate and a rigid porous metal coating adhered to at least a substantial portion of said substrate, said porous metal coating including a plurality of metal particles bonded together at their points of contact with each other and with said substrate to form a network of interconnected pores substantially uniformly distributed through the coating, said porous coating having a porosity of about 10 to about 50% and a thickness of about 20 to about 300 microns, said porous coating and the coating-substrate interface having a shear strength greater than about 1000 psi, the composite of said porous coating and substrate having a high fatigue tolerance, said metal particles having a particle size of -500 mesh.
0 Assignments
0 Petitions
Accused Products
Abstract
A novel cardiovascular prosthetic device or implant having many useful cardiovascular applications comprises a porous surface and a network of interconnected interstitial pores below the surface in fluid flow communication with the surface pores. Tissue forms a smooth thin adherent coating of self-determining thickness on the porous surface making it resistant to the formation of the blood clots normally associated with the presence of foreign bodies in the blood stream.
238 Citations
6 Claims
- 1. A heart valve structure comprising an occluder, an occluder seating ring and occluder guide means, each of said occluder seating ring and occluder guide means being constructed of metal inert to blood and consisting of a dense rigid, coherent metal substrate and a rigid porous metal coating adhered to at least a substantial portion of said substrate, said porous metal coating including a plurality of metal particles bonded together at their points of contact with each other and with said substrate to form a network of interconnected pores substantially uniformly distributed through the coating, said porous coating having a porosity of about 10 to about 50% and a thickness of about 20 to about 300 microns, said porous coating and the coating-substrate interface having a shear strength greater than about 1000 psi, the composite of said porous coating and substrate having a high fatigue tolerance, said metal particles having a particle size of -500 mesh.
-
6. A heart valve structure comprising an occluder, an occluder seating ring having sewing ring mounting means, occluder guide means, and a flexible sewing ring constructed of polymeric material inert to blood and body fluids and adhered to said sewing ring mounting means, each of said occluder seating ring and occluder guide means being constructed of metal inert to blood,
at least a substantial proportion of each of occluder seating ring and occluder guide means consisting of a dense rigid coherent metal substrate and a rigid porous metal coating adhered to said substrate, said porous coating including a plurality of metal particles bonded together at their points of contact with each other and with said substrate to form a network of interconnected pores substantially uniformly distributed throughout said coating, said sewing ring comprising an outer layer of porous polymeric material having a plurality of interconnected pores distributed therethrough adhered to a flexible coherent polymeric substrate, said sewing ring being adhered to said sewing ring mounting means by interlock of said flexible coherent polymeric substrate in the interconnected pore network of the porous metal coating on said sewing ring mounting means.
Specification