US5092896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Finger joint prosthesis
Assignee: Protek AG
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Filing: 1990-09-24
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Granted: 1992-03-03
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Expires: 2010-09-24
Abstract
Abstract A finger joint prosthesis is provided with consists of two pegs of sintered hydroxylapatite for anchoring in adjacent finger bones and which is provided with an intermediate slide layer of polyurethane between the pegs to permit relative movement therebetween. The pegs together with the intermediate layer which may be anchored on one of the pegs form concave and convex bearing areas mating with each other to allow a guided motion in the bend-stretch plane.
Inventors
- 👤 Hans-Christoph Meuli
- 👤 Otto Frey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:06
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/42; A61F2/4241; A61F2/30767; A61F2/30907; A61F2002/30001; A61F2002/30003; A61F2002/3006; A61F2002/30062; A61F2002/30064; A61F2/3094; A61F2002/30968; A61F2002/4243; A61F2210/00; A61F2210/0004; A61F2310/00; A61F2310/00005; A61F2310/00179; A61F2310/00293
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
70 words
A finger joint prosthesis comprising a first peg of sintered hydroxylapatite for anchoring in one finger bone; a second peg of sintered hydroxylapatite for anchoring in a second finger bone; an intermediate slide layer between and separating said pegs to permit relative movement between said pegs and being of a material to impede build-up of bone; and an elastic hose of resorbable material surrounding said pegs and said intermediate layer.
Claim 2
Dependent Claim
70 words
A finger joint prosthesis comprising a first peg of sintered hydroxylapatite for anchoring in one finger bone; a second peg of sintered hydroxylapatite for anchoring in a second finger bone; an intermediate slide layer between and separating said pegs to permit relative movement between said pegs and being of a material to impede build-up of bone; and an elastic hose of resorbable material surrounding said pegs and said intermediate layer.
Claim 3
Dependent Claim
30 words
A finger joint prosthesis as set forth in claim 1 wherein each peg is tapered and has a plurality of undercuts in an outer surface for ingrowth of bone therein.
Claim 4
Dependent Claim
41 words
A finger joint prosthesis as set forth in claim 1 wherein said intermediate layer and one of said pegs have mating bearing surfaces facing each other with one of said surfaces being concave and the other of said surfaces being convex.
Claim 5
Dependent Claim
21 words
A finger joint prosthesis as set forth in claim 1 wherein said intermediate layer is anchored in one of said pegs.
Claim 6
Dependent Claim
41 words
A finger joint prosthesis as set forth in claim 4 wherein said layer and the other of said pegs have mating bearing surfaces facing each other with one of said surfaces being concave and the other of said surfaces being convex.
Claim 7
Dependent Claim
17 words
A finger joint prosthesis as set forth in claim 1 wherein said layer is made of polyurethane.
Claim 8
Dependent Claim
21 words
A finger joint prosthesis as set forth in claim 1 wherein said hose is made of one of gelatin and polylactate.
Claim 9
Dependent Claim
73 words
A finger joint prosthesis comprising a first tapered peg of sintered hydroxylapatite for anchoring in one finger bone; a second tapered peg of sintered hydroxylapatite for anchoring in a second finger bone; an intermediate layer anchored on one of said pegs for sliding of the other of said pegs thereon and being of a material to impede bone build-up; and an elastic hose of resorbable material surrounding said pegs and said intermediate layer.
Claim 10
Dependent Claim
73 words
A finger joint prosthesis comprising a first tapered peg of sintered hydroxylapatite for anchoring in one finger bone; a second tapered peg of sintered hydroxylapatite for anchoring in a second finger bone; an intermediate layer anchored on one of said pegs for sliding of the other of said pegs thereon and being of a material to impede bone build-up; and an elastic hose of resorbable material surrounding said pegs and said intermediate layer.
Claim 11
Dependent Claim
22 words
A finger joint prosthesis as set forth in claim 8 wherein each peg has a plurality of undercuts in an outer surface.
Claim 12
Dependent Claim
21 words
A finger joint prosthesis as set forth in claim 8 wherein said layer is made of polyurethane or other biocompatible plastics.
Claim 13
Dependent Claim
39 words
A finger joint prosthesis as set forth in claim 8 wherein said layer and said other peg have mating bearing surfaces facing each other with one of said surfaces being concave and the other of said surfaces being convex.
Claim 14
Dependent Claim
21 words
A finger joint prosthesis as set forth in claim 8 wherein said hose is made of one of gelatin and polylactate.
References Cited (Backward Citations)
US3879767A
Cited
US4097935A
Cited
US4231121A
Cited
EP0176711A1
Cited
US4685919A
Cited
FR2605878A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-03-03 | 1995-09-02 | 1996-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-03 | 1999-09-02 | 2000-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-03 | 2003-09-02 | 2004-03-03 | $7700.00 | Window Closed / Lapsed |