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Cardiovascular prosthetic devices and implants with porous systems

  • US 4,101,984 A
  • Filed: 05/05/1976
  • Issued: 07/25/1978
  • Est. Priority Date: 05/09/1975
  • Status: Expired due to Term
First Claim
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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.

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