US3886601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prosthetic knee joint assembly
Assignee: Individual
•
Filing: 1974-09-09
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Granted: 1975-06-03
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Expires: 1994-09-09
Abstract
Abstract A prosthetic limb joint consisting of two joint members adapted for connection to respective bones such as a femur and a tibia, one member being formed with a spherical ball end having opposed cylindrical trunnions and the other member being formed with a spherical socket that extends over more than 180* and has a rim provided with cut-out recesses to receive the opposed trunnions defining an open end that is sufficiently resilient to receive the ball with snap-engagement during assembly and hold it in the socket during flexing of the joint.
Inventors
- 👤 Eric George Findlay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:20
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2/3836; A61F2/3854
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
174 words
A prosthetic knee joint assembly comprising first and second joint members respectively formed to be rigidly attached to the femur and tibia to be interconnected by the joint, wherein a ball on the first member is adapted to fit for rocking movement within a socket of the second member which socket extends over more than 180* of arc with respect to the axis of rocking so as to support the suspended weight of the lower leg and resist dislocation of the joint following snap-engagement of the ball in the socket for bearing compressive forces acting on the joint and there being a pair of diametrally extending cylindrical trunnions projecting on opposite sides of the ball on a common lateral axis thereof to be received in corresponding recesses in a rim of the socket for limiting relative angular movement between the members in two opposite directions, said recesses consisting of cut-outs in said rim breaking the continuity of said socket so as to permit escape of fluid from the socket as said snap-engagement takes place.
Claim 2
Dependent Claim
174 words
A prosthetic knee joint assembly comprising first and second joint members respectively formed to be rigidly attached to the femur and tibia to be interconnected by the joint, wherein a ball on the first member is adapted to fit for rocking movement within a socket of the second member which socket extends over more than 180* of arc with respect to the axis of rocking so as to support the suspended weight of the lower leg and resist dislocation of the joint following snap-engagement of the ball in the socket for bearing compressive forces acting on the joint and there being a pair of diametrally extending cylindrical trunnions projecting on opposite sides of the ball on a common lateral axis thereof to be received in corresponding recesses in a rim of the socket for limiting relative angular movement between the members in two opposite directions, said recesses consisting of cut-outs in said rim breaking the continuity of said socket so as to permit escape of fluid from the socket as said snap-engagement takes place.
Claim 3
Dependent Claim
174 words
A prosthetic knee joint assembly comprising first and second joint members respectively formed to be rigidly attached to the femur and tibia to be interconnected by the joint, wherein a ball on the first member is adapted to fit for rocking movement within a socket of the second member which socket extends over more than 180* of arc with respect to the axis of rocking so as to support the suspended weight of the lower leg and resist dislocation of the joint following snap-engagement of the ball in the socket for bearing compressive forces acting on the joint and there being a pair of diametrally extending cylindrical trunnions projecting on opposite sides of the ball on a common lateral axis thereof to be received in corresponding recesses in a rim of the socket for limiting relative angular movement between the members in two opposite directions, said recesses consisting of cut-outs in said rim breaking the continuity of said socket so as to permit escape of fluid from the socket as said snap-engagement takes place.
Claim 4
Dependent Claim
174 words
A prosthetic knee joint assembly comprising first and second joint members respectively formed to be rigidly attached to the femur and tibia to be interconnected by the joint, wherein a ball on the first member is adapted to fit for rocking movement within a socket of the second member which socket extends over more than 180* of arc with respect to the axis of rocking so as to support the suspended weight of the lower leg and resist dislocation of the joint following snap-engagement of the ball in the socket for bearing compressive forces acting on the joint and there being a pair of diametrally extending cylindrical trunnions projecting on opposite sides of the ball on a common lateral axis thereof to be received in corresponding recesses in a rim of the socket for limiting relative angular movement between the members in two opposite directions, said recesses consisting of cut-outs in said rim breaking the continuity of said socket so as to permit escape of fluid from the socket as said snap-engagement takes place.
Claim 5
Dependent Claim
30 words
An assembly according to claim 1, wherein the first member is a metal component and the second member is formed from synthetic plastics material sufficiently resilient to permit said snap-engagement.
Claim 6
Dependent Claim
16 words
An assembly according to claim 2 wherein said synthetic plastics material is of high density polyethylene.
Claim 7
Dependent Claim
25 words
An assembly according to claim 1, wherein the member adapted to be fixed to the femur includes a front shield for location behind the patella.
Claim 8
Dependent Claim
24 words
An assembly according to claim 1, wherein said joint members each comprise a flange for abutment with the prepared end of the associated bone.
Claim 9
Dependent Claim
25 words
An assembly according to claim 1, wherein said joint members each comprise a spike for axial insertion into an end part of the associated bone.
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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |