| abstract |
1316809 Prosthetic device ONTARIO RESEARCH FOUNDATION 24 May 1971 [4 June 1970 4 Feb 1971] 27110/70 and 3964/71 Heading A5R [Also in Division B2] A surgical prosthetic device comprises a composite structure consisting of a solid metallic substrate (10) and a porous metallic coating (12) adhering to the substrate and extending at least partially over the surface of said substrate, the metallic material of the substrate and coating being substantially non-corrodable by body fluids, the coating consisting of a plurality of metallic particles contacting each other to define a plurality of connected interstitial pores in the coating, the particles being of such a size and spacing from each other as to establish an average pore size of at least 20 microns and a coating porosity of between 10% and 40%. One such device may be formed by degreasing a 1/4" diameter rod of a cobalt alloy and coating to a depth of 1/32" with an aqueous slurry of +325 mesh, powdered cobalt alloy, an aqueous solution of 1% methylcellulose, an aqueous solution of 2¢% dioctyl sodium sulfosuccinate, and ammonium hydroxide. After drying the coated rod is sintered at 2200‹F for approximately two hours in a dry hydrogen atmosphere, thus providing coatings with pore sizes ranging from 50 to 100 microns. The device may be used to replace bone or repair damaged hard and soft tissue. It may also be used in the form of a disc for the cranium, a hip joint prosthesis, surgical staple, dental implant, or a valve connecting internal parts of the body to external treatment devices. |