US3840905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Endoprosthetic knee joint
Assignee: National Research Development Corp UK
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Filing: 1973-09-17
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Granted: 1974-10-15
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Expires: 1993-09-17
Abstract
Abstract An endoprosthetic knee joint device comprises femoral and tibial components having respective generally concave and convex bearing surfaces for mutual articulatory engagement, which surfaces are of similar saddle shapes including pommels at one pair of corresponding ends, and the longitudinal medial profiles of which shapes are mutually divergent. Preferably the lateral profiles of the saddle shapes are substantially complementary at their other ends remote from their pommels, but are progressively mutually divergent towards the one ends.
Inventors
- 👤 G Deane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:32
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2/3886
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
55 words
An endoprosthetic knee joint device comprising femoral and tibial components having respective generally concave and convex bearing surfaces for mutual articulatory engagement with the latter received in the former, which surfaces are of similar saddle shapes including pommels at one pair of corresponding ends, and the longitudinal medial profiles of which shapes are mutually divergent.
Claim 2
Dependent Claim
55 words
An endoprosthetic knee joint device comprising femoral and tibial components having respective generally concave and convex bearing surfaces for mutual articulatory engagement with the latter received in the former, which surfaces are of similar saddle shapes including pommels at one pair of corresponding ends, and the longitudinal medial profiles of which shapes are mutually divergent.
Claim 3
Dependent Claim
39 words
A device according to claim 1 wherein the lateral profiles of said saddle shapes are substantially complementary at their other pair of corresponding ends remote from said pommels, but are progressively mutually divergent towards said one pair of ends.
Claim 4
Dependent Claim
39 words
A device according to claim 1 wherein the intermediate portion of the longitudinal medial profile of said concave saddle shape extending between said one and other ends thereof corresponds to the same profile portion of a natural femoral condyle.
Claim 5
Dependent Claim
22 words
A device according to claim 1, wherein each of said saddle shapes is extending into flared portions along its longitudinal side peripheries.
Claim 6
Dependent Claim
28 words
A device according to claim 1 wherein the remaining exterior surface of said femoral component has a general shaping which is a simplified form of said saddle shaping.
Claim 7
Dependent Claim
31 words
A device according to claim 1 wherein the remaining exterior surface of said tibial component comprises two ridge portions and a groove therebetween extending longitudinally relative to the associated saddle shaping.
Claim 8
Dependent Claim
28 words
A device according to claim 6 wherein said tibial component remaining exterior surface further comprises a web bridging said ridge portions across said one end of said groove.
Claim 9
Dependent Claim
11 words
A device according to claim 7 wherein said web is apertured.
Claim 10
Dependent Claim
24 words
A device according to claim 1 wherein the remaining exterior surface of at least one of said components is formed with a low-relief structure.
Claim 11
Dependent Claim
20 words
A device according to claim 1 wherein said femoral and tibial components are respectively made of plastics material and metal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |