Patent US3728742A successfully refreshed from Google Patents.
US3728742A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Knee or elbow prosthesis
Assignee: MTG Divestitures LLC
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Filing: 1971-06-18
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Granted: 1973-04-24
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Expires: 1991-06-18
Abstract
Abstract A total knee or elbow joint prosthesis having opposing condyle and plateau replacing members for attachment respectively to the upper and lower arm or leg bones, the members having respectively convex and concave spherical mating surfaces.
Inventors
- 👤 R Averill
- 👤 A Khowaylo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:58
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2/3804
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
167 words
A joint prosthesis suitable for knee or elbow comprising an upper member and a mating lower member, the upper member having a pair of spaced condyle portions joined by an intercondyloidal segment, each condyle portion being formed with a spherically curved downwardly facing convex surface, and the lower member having a pair of spaced plateau portions joined by an interplateau segment, each plateau portion being formed with a spherically curved upwardly facing concave surface engageable with the corresponding convex surface, the radius of each spherical condyle surface being no greater than that of the corresponding spherical plateau surface, said upper and lower members including means for attachment to a bone structure and providing for substantial articulation of such bone members in a single plane, and said intercondyloidal segment and interplateau segment being substantially narrower than the respective condyle portions and plateau portions thereby providing intercondyloidal and interplateau apertures for receiving cruciate ligaments connecting upper and lower bone structures to which the prosthesis is adapted to be attached.
Claim 2
Dependent Claim
167 words
A joint prosthesis suitable for knee or elbow comprising an upper member and a mating lower member, the upper member having a pair of spaced condyle portions joined by an intercondyloidal segment, each condyle portion being formed with a spherically curved downwardly facing convex surface, and the lower member having a pair of spaced plateau portions joined by an interplateau segment, each plateau portion being formed with a spherically curved upwardly facing concave surface engageable with the corresponding convex surface, the radius of each spherical condyle surface being no greater than that of the corresponding spherical plateau surface, said upper and lower members including means for attachment to a bone structure and providing for substantial articulation of such bone members in a single plane, and said intercondyloidal segment and interplateau segment being substantially narrower than the respective condyle portions and plateau portions thereby providing intercondyloidal and interplateau apertures for receiving cruciate ligaments connecting upper and lower bone structures to which the prosthesis is adapted to be attached.
Claim 3
Dependent Claim
26 words
A joint prosthesis according to claim 1 in which the upper member is metallic and the lower bone member is made mainly of an organic polymer.
Claim 4
Dependent Claim
29 words
A joint prosthesis according to claim 1 in which the radius of each spherical condyle surface is less than the radius of curvature of each mating spherical plateau surface.
Claim 5
Dependent Claim
16 words
A joint prosthesis according to claim 1 in which both upper and lower members are metallic.
Claim 6
Dependent Claim
27 words
A joint prosthesis according to claim 1 in which the upper member is metallic and comprises individually formed and surfaced condyle portions attached to said intercondyloidal segment.
Claim 7
Dependent Claim
29 words
A joint prosthesis according to claim 1 in which each spherically curved condyle portion and plateau portion has a front-to-back dimension that is substantially greater than its side-to-side dimension.
Claim 8
Dependent Claim
18 words
A joint prosthesis according to claim 6 in which the front-to-back dimension is substantially twice the side-to-side dimension.
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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |