US3938198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hip joint prosthesis
Assignee: Bayer Corp
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Filing: 1973-09-27
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Granted: 1976-02-17
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Expires: 1993-09-27
Abstract
Abstract A prosthesis for replacement of a damaged joint or load-bearing structure in an animal or human body comprises a shaped structural member, a relatively thick or cushioning coating of a physiologically inert elastomer over the surfaces of the structural member in load-bearing relationship with the skeletal structure of the body, and an open-pore, tissue-ingrowth-receptive fabric coating the elastomer, all elements being firmly bonded to each other. In many embodiments, a stem of the prosthesis comprising the above elements is adapted to be inserted into a bone cavity, and is eventually affixed firmly thereto by fibrous tissue and bony ingrowth. Stability of the stem portion is enhanced by buttresses integral with the base of the stem.
Inventors
- 👤 Paul Kahn
- 👤 James A. Stubstad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:14
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/50; A61L27/56; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30767; A61F2/30907; A61L27/02; A61L27/04; A61L27/28; A61L27/34; A61F2/3094; A61F2/30965; A61F2/32; A61F2/36; A61F2/3662; A61F2002/30001; A61F2002/30003; A61F2002/3006; A61F2002/30069; A61F2002/3007; A61F2002/30316; A61F2002/30329; A61F2002/30448; A61F2002/30461; A61F2002/30535; A61F2002/30563; A61F2002/30906; A61F2002/3092; A61F2/34; A61F2002/3429; A61F2002/3445; A61F2002/3448; A61F2/3609; A61F2002/3625; A61F2002/3631; A61F2220/00; A61F2220/0025; A61F2220/005; A61F2220/0075
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
116 words
A hip prosthesis for repairing a damaged hip joint in an animal skeletal structure, comprising in combination: I. an acetabulum prosthesis having a. a hemispherical metal cup having an exterior annular flange at its base, a concave surface and a convex surface, b. a relatively thick cushioning layer of an elastomer disposed over and covering said convex face and said flange, c. an open pore, physiologically inert coating of fabric disposed over and covering said elastomer, and adapted to receive host tissue ingrowth, d. said cup, said elastomer and said coating all being firmly bonded to each other, and Ii. a femoral head prosthesis having a ball at one end, said ball fitting in said cup.
Claim 2
Dependent Claim
116 words
A hip prosthesis for repairing a damaged hip joint in an animal skeletal structure, comprising in combination: I. an acetabulum prosthesis having a. a hemispherical metal cup having an exterior annular flange at its base, a concave surface and a convex surface, b. a relatively thick cushioning layer of an elastomer disposed over and covering said convex face and said flange, c. an open pore, physiologically inert coating of fabric disposed over and covering said elastomer, and adapted to receive host tissue ingrowth, d. said cup, said elastomer and said coating all being firmly bonded to each other, and Ii. a femoral head prosthesis having a ball at one end, said ball fitting in said cup.
Claim 3
Dependent Claim
29 words
The prosthesis of claim 1 wherein the concave surface of the metal cup has affixed to it a polymeric surface adapted to receive and coact with said femoral head.
Claim 4
Dependent Claim
37 words
The prosthesis of claim 2 wherein said polymeric surface's annular flange lies beyond the arc of the hemisphere and has an annular exterior recess, and a metal band in said recess retaining said ball in said cup.
Claim 5
Dependent Claim
26 words
The prosthesis of claim 3 wherein said metal cup has a radial flange extending around said cup, for securing pins for temporary anchoring to bone structure.
Claim 6
Dependent Claim
184 words
A hip prosthesis for repairing a damaged hip joint in an animal skeletal structure, comprising in combination: I. an acetabulum prosthesis having a. a hemispherical metal cup having an exterior annular flange at its base, a concave surface and a convex surface, b. a relatively thick cushioning layer of an elastomer disposed over and covering said convex face and said flange, c. an open pore, physiologically inert coating of fabric disposed over and covering said elastomer, and adapted to receive host tissue ingrowth, and d. said cup, said elastomer and said coating all being firmly bonded to each other, and Ii. a femoral head prosthesis having a ball at one end, said ball fitting in said cup, said femoral head prosthesis comprising a. a stem adapted to be inserted into a medullary canal of a bone of said structure, b. a reinforcing core extending into said stem, c. a cushioning coating of elastomer over said core, secured to and at least partially enclosing the same, and d. a surface covering of open-pore material secured to said elastomer and adapted to receive host tissue ingrowth.
Claim 7
Dependent Claim
184 words
A hip prosthesis for repairing a damaged hip joint in an animal skeletal structure, comprising in combination: I. an acetabulum prosthesis having a. a hemispherical metal cup having an exterior annular flange at its base, a concave surface and a convex surface, b. a relatively thick cushioning layer of an elastomer disposed over and covering said convex face and said flange, c. an open pore, physiologically inert coating of fabric disposed over and covering said elastomer, and adapted to receive host tissue ingrowth, and d. said cup, said elastomer and said coating all being firmly bonded to each other, and Ii. a femoral head prosthesis having a ball at one end, said ball fitting in said cup, said femoral head prosthesis comprising a. a stem adapted to be inserted into a medullary canal of a bone of said structure, b. a reinforcing core extending into said stem, c. a cushioning coating of elastomer over said core, secured to and at least partially enclosing the same, and d. a surface covering of open-pore material secured to said elastomer and adapted to receive host tissue ingrowth.
Claim 8
Dependent Claim
65 words
A femoral head prosthesis, including in combination: a. a rigid ball member, b. a rigid stem core member extending from said ball member and integral therewith, c. a cushioning coating of elastomer secured to and at least partially enclosing said stem core member, and d. a surface layer of fibrous material capable of receiving tissue ingrowth secured to at least a portion of said elastomer.
Claim 9
Dependent Claim
65 words
A femoral head prosthesis, including in combination: a. a rigid ball member, b. a rigid stem core member extending from said ball member and integral therewith, c. a cushioning coating of elastomer secured to and at least partially enclosing said stem core member, and d. a surface layer of fibrous material capable of receiving tissue ingrowth secured to at least a portion of said elastomer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-16 | 1979-08-18 | 1980-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-16 | 1983-08-18 | 1984-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-16 | 1987-08-18 | 1988-02-17 | $7700.00 | Window Closed / Lapsed |