Patent US3816853A successfully refreshed from Google Patents.
US3816853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Implantable prosthetic knee joint
Assignee: Individual
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Filing: 1972-11-16
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Granted: 1974-06-18
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Expires: 1992-11-16
Abstract
Abstract A prosthetic knee joint comprising a tibial member having a stem for insertion into, and securing to, the tibia, and spindle means at the end of the member opposite to the stem, the spindle means extending transversely to the stem; and two bearing bushes designed for anchorage in femoral condyles to extend laterally of the knee, the bearing bushes pivotally supporting opposite ends of the spindle means.
Inventors
- 👤 R Elson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:06
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2/3836; A61F2/384; A61F2/3845; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32606; Y10T403/32951; Y10T403/32967
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
81 words
A prosthetic knee joint for implantation into a natural leg, comprising a tibial member having a stem for location within the tibia, and spindle means at the end of the member opposite to the stem, the spindle means extending transversely to each side of the stem; and two discrete bearing bushes, each bearing bush for direct anchorage in femoral condyles in spaced apart relationship, each bush respectively surrounding and pivotally supporting one of the opposite end portions of the spindle means.
Claim 2
Dependent Claim
81 words
A prosthetic knee joint for implantation into a natural leg, comprising a tibial member having a stem for location within the tibia, and spindle means at the end of the member opposite to the stem, the spindle means extending transversely to each side of the stem; and two discrete bearing bushes, each bearing bush for direct anchorage in femoral condyles in spaced apart relationship, each bush respectively surrounding and pivotally supporting one of the opposite end portions of the spindle means.
Claim 3
Dependent Claim
56 words
A prosthetic knee joint according to claim 1 in which the tibial member comprises said stem and an extension from the upper end of said stem, the axis of said extension making an obtuse angle with the axis of said stem and said spindle means extending to either side of the free end of said extension.
Claim 4
Dependent Claim
41 words
A prosthetic knee joint according to claim 2 in which said extension is formed at its free end with a bore and the spindle means is a circular-section spindle fitting through said bore and projecting to each side of said extension.
Claim 5
Dependent Claim
33 words
A prosthetic knee joint according to claim 3 in which said spindle has a central section oF greater diameter than the remainder thereof, said central section being a force fit in said bore.
Claim 6
Dependent Claim
28 words
A prosthetic knee joint according to claim 1 in which each said bearing bush is substantially in the form of a hollow cylinder closed at one end thereof.
Claim 7
Dependent Claim
28 words
A prosthetic knee joint according to claim 1 in which said tibial member is made from stainless steel and said bearing bushes are made from high density polyethylene.
Claim 8
Dependent Claim
100 words
A prosthetic knee joint for implantation into a natural leg comprising a tibial member having a stem for insertion into, and securing to, the tibia, and spindle means at the end of the member opposite to the stem, the spindle means extending transversely to the stem; and two bearing bushes for anchorage in femoral condyles to extend laterally with respect to the knee, said bearing bushes being substantially in the form of a hollow cylinder one end of which is closed, the outer surface of each bush being grooved, said bearing bushes pivotally supporting opposite ends of the spindle means.
Claim 9
Dependent Claim
100 words
A prosthetic knee joint for implantation into a natural leg comprising a tibial member having a stem for insertion into, and securing to, the tibia, and spindle means at the end of the member opposite to the stem, the spindle means extending transversely to the stem; and two bearing bushes for anchorage in femoral condyles to extend laterally with respect to the knee, said bearing bushes being substantially in the form of a hollow cylinder one end of which is closed, the outer surface of each bush being grooved, said bearing bushes pivotally supporting opposite ends of the spindle means.
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) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |