US3896503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Endosphosthetic ankle joint devices
Assignee: National Research Development Corp UK
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Filing: 1974-02-06
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Granted: 1975-07-29
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Expires: 1994-02-06
Abstract
Abstract An endoprosthetic ankle joint comprises a tibial component and talar component defining respective concave and convex surfaces of substantially complementary, open-ended, generally cylindrical form for mutual articulatory bearing engagement. These surfaces are preferably more precisely cylindrical, but may have curvature in the axial direction for added stability. Fixation is effected with gap-filling cement between the bones and low relief configurations provided on the components remotely from their bearing surfaces.
Inventors
- 👤 Michael Alexander Reyk Freeman
- 👤 Geoffrey Edward Kempson
- 👤 Michael Anthony Tuke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:43
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/42; A61F2/4202; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30138; A61F2002/30153; A61F2002/30154; A61F2002/30316; A61F2002/30329; A61F2002/30331; A61F2/30767; A61F2/30771; A61F2002/30795; A61F2002/30878; A61F2002/30879; A61F2002/30883; A61F2220/00; A61F2220/0025; A61F2220/0033; A61F2230/00; A61F2230/0002; A61F2230/0017; A61F2230/0019; A61F2230/0021
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
130 words
An endoprosthetic ankle joint device comprising: a tibial component in the general form of a first rectangular block having one side grooved to define a concave surface of substantially part-circular cylindrical shape, said concave surface opening at its longitudinal ends into two opposed sides of said first block serially adjacent said one side, and the side of said first block opposite said one side being provided with a low relief configuration; and a talar component in the general form of a second rectangular block having three serially-adjacent sides cut away to define a convex surface of substantially part-circular cylindrical shape complementary to and in mutual articulatory bearing engagement with said concave surface, and the side of said second block opposite said convex surface being provided with a low relief configuration.
Claim 2
Dependent Claim
130 words
An endoprosthetic ankle joint device comprising: a tibial component in the general form of a first rectangular block having one side grooved to define a concave surface of substantially part-circular cylindrical shape, said concave surface opening at its longitudinal ends into two opposed sides of said first block serially adjacent said one side, and the side of said first block opposite said one side being provided with a low relief configuration; and a talar component in the general form of a second rectangular block having three serially-adjacent sides cut away to define a convex surface of substantially part-circular cylindrical shape complementary to and in mutual articulatory bearing engagement with said concave surface, and the side of said second block opposite said convex surface being provided with a low relief configuration.
Claim 3
Dependent Claim
70 words
A device according to claim 1 wherein said first block is substanTially square in plan view relative to said concave surface, and said second block is rectangular in plan view relative to said convex surface, said second block plan view having similar width to and greater length than said first block, with the circular curve of said convex surface cylindrical shape extending in the length direction of said second block.
Claim 4
Dependent Claim
19 words
A device according to claim 2 wherein said first and second blocks are respectively of plastics material and metal.
Claim 5
Dependent Claim
30 words
A device according to claim 1 wherein each of said low relief configurations comprises a plurality of recesses and a stud projecting from the sides including said low relief configurations.
Claim 6
Dependent Claim
234 words
The use of an endoprosthetic bone joint device including: a first component in the form of an open-ended trough defining a concave inner surface of substantially part-cylindrical shape with a circular arcuate cross-sectional profile, and defining an outer surface having a rear surface portion which is located remotely from said concave surface and is provided with a low relief configuration; and a second component of roller form defining a convex outer surface portion of substantially part-cylindrical shape with a circular arcuate cross-sectional profile, which convex surface is generally complementary to said concave surface for engagement therein in mutual articulatory relation, and defining a rear surface portion which is located remotely from said convex surface and provided with a relieved configuration; said use comprising: replacing the articular function of the tibial-talar ankle joint by exposing said joint, resecting the tibia between the tibial medial malleolus and the fibular lateral malleolus, connecting said first component to the resected part of the tibia by way of the respective rear surface portion and with the longitudinal direction of said concave surface extending from one to the other of said malleoli, resecting the talus, connecting said second component to the resected talus by way of the respective rear surface portion and with the longitudinal direction of said convex surface extending parallel to that of said concave surface, and closing said joint to engage said components in said articulatory relation.
Claim 7
Dependent Claim
234 words
The use of an endoprosthetic bone joint device including: a first component in the form of an open-ended trough defining a concave inner surface of substantially part-cylindrical shape with a circular arcuate cross-sectional profile, and defining an outer surface having a rear surface portion which is located remotely from said concave surface and is provided with a low relief configuration; and a second component of roller form defining a convex outer surface portion of substantially part-cylindrical shape with a circular arcuate cross-sectional profile, which convex surface is generally complementary to said concave surface for engagement therein in mutual articulatory relation, and defining a rear surface portion which is located remotely from said convex surface and provided with a relieved configuration; said use comprising: replacing the articular function of the tibial-talar ankle joint by exposing said joint, resecting the tibia between the tibial medial malleolus and the fibular lateral malleolus, connecting said first component to the resected part of the tibia by way of the respective rear surface portion and with the longitudinal direction of said concave surface extending from one to the other of said malleoli, resecting the talus, connecting said second component to the resected talus by way of the respective rear surface portion and with the longitudinal direction of said convex surface extending parallel to that of said concave surface, and closing said joint to engage said components in said articulatory relation.
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) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |