US4846840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Joint prosthesis
Assignee: Individual
•
Filing: 1987-12-21
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Granted: 1989-07-11
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Expires: 2007-12-21
Abstract
Abstract The joint prosthesis according to the invention is characterized in that it comprises two substantially concentric convex opposite surface portions (1, 2). Preferably the convex surface portions are portions of a sphere which are connected together by a frustoconical portion (3) and one (1) of the convex surface portions has a greater radius of curvature than the other (2).
Inventors
- 👤 Sylvain Leclercq
- 👤 Jacques Aubriot
- 👤 Vincent Mercier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:26
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61F2/3601; A61F2/3603; A61F2/42; A61F2/40; A61F2002/30001; A61F2002/30003; A61F2002/3006; A61F2002/30069; A61F2002/30108; A61F2002/30199; A61F2002/30205; A61F2002/3021; A61F2002/30242; A61F2002/30245; A61F2002/30316; A61F2002/30317; A61F2002/30327; A61F2002/30329; A61F2002/30448; A61F2002/30535; A61F2002/30563; A61F2002/30621; A61F2002/30639; A61F2002/30642; A61F2/3609; A61F2002/3611; A61F2002/3615; A61F2220/00; A61F2220/0025; A61F2220/005; A61F2230/00; A61F2230/0063; A61F2230/0067; A61F2230/0071; A61F2250/00; A61F2250/0014; A61F2250/0039; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00017
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
114 words
A hip joint prosthesis adapted for disposition between the pelvic bone and the femoral head of a hip joint, comprising: (1) a first convex surface portion adapted for rotatable disposition in a cavity formed in the femoral head; (2) a second convex surface portion adapted for rotatable disposition in a cvity formed in the pelvic bone and which is convex in a direction opposite to the convex direction of the said first convex surface portion; (3) a third portion disposed between and immovably affixed to said first and second convex surface portions; and wherein the radius of curvature of the first convex surface portion is smaller than that of the second convex surface portion.
Claim 2
Dependent Claim
114 words
A hip joint prosthesis adapted for disposition between the pelvic bone and the femoral head of a hip joint, comprising: (1) a first convex surface portion adapted for rotatable disposition in a cavity formed in the femoral head; (2) a second convex surface portion adapted for rotatable disposition in a cvity formed in the pelvic bone and which is convex in a direction opposite to the convex direction of the said first convex surface portion; (3) a third portion disposed between and immovably affixed to said first and second convex surface portions; and wherein the radius of curvature of the first convex surface portion is smaller than that of the second convex surface portion.
Claim 3
Dependent Claim
16 words
The device of claim 1 wherein both said convex surface portions are portions of a sphere.
Claim 4
Dependent Claim
20 words
The device of claim 2 wherein the said third portion has a configuration in the shape of a conical frustrum.
Claim 5
Dependent Claim
20 words
The device of claim 3 wherein the base of the frustrum is fixedly attached to said second convex surface portion.
Claim 6
Dependent Claim
59 words
The device of claim 1 wherein the first convex surface portion is disposed in said cavity by positioning said first convex surface portion in a cup means which is configured on one surface thereof to fit with a cavity formed in the femoral head and configured on the opposite surface thereof to the shape of said first convex surface.
Claim 7
Dependent Claim
43 words
The device of claim 1 wherein the second convex surface portion is disposed in said cavity by positioning said second convex surface in a cup means which is configured on one surface thereof to fit with a cavity formed in the pelvic bone.
Claim 8
Dependent Claim
38 words
The device according to claim 1 wherein an elastic member is disposed between the first convex surface and the said third portion and said first convex portion and said third portion are fixedly attached to said elastic member.
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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) | 1992-07-10 | 1993-01-09 | 1993-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-10 | 1997-01-09 | 1997-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-10 | 2001-01-09 | 2001-07-11 | $7700.00 | Window Closed / Lapsed |