US3852831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Endoprosthetic elbow joint
Assignee: National Research Development Corp UK
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Filing: 1974-01-29
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Granted: 1974-12-10
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Expires: 1994-01-29
Abstract
Abstract An endoprosthetic elbow joint has an ulnar component with a saddle shaped bearing surface and a humeral component including a bifurcated member supporting a bearing member between the free ends of its arms. The humeral bearing member has a bearing surface which is of generally complementary shaping to that of the ulnar component to engage in and across the saddle shaping of the latter for mutual articulation. In a preferred arrangement the ulnar component includes a platform with which a bearing member is releasably connected, suitably by a sliding dovetailsection keying, the connecting interfaces are circularly curved, and the bearing member can pass through the humeral component. With this arrangement the humeral component and ulnar platform are fixed in place and the ulnar bearing member is then passed through the humeral component in bearing engagement therewith to connect with the platform.
Inventors
- 👤 R Dee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:47
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2/3804; A61F2002/30001; A61F2002/30316; A61F2002/30329; A61F2002/30383; A61F2002/30387; A61F2220/00; A61F2220/0025
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
140 words
An endoprosthetic elbow joint device comprising a cooperable pair of ulnar and humeral components; the ulnar component including a first bearing member having a first bearing surface of generally saddle shaped formed as a part of a surface of revolution with concave circumferential form and convex axial form; and the humeral component including a bifurcated member, and a second bearing member bridging the free ends of the arms of said bifurcated member; said second bearing member having a second bearing surface in mutual articulatory generally complementary bearing engagement with said first bearing surface, and shaped as a surface of revolution with its axis of revolution coincident with that of said first bearing surface and extending between said arm free ends, with convex circumferential form of greater angular extent than that of said first bearing surface, and with concave axial form.
Claim 2
Dependent Claim
140 words
An endoprosthetic elbow joint device comprising a cooperable pair of ulnar and humeral components; the ulnar component including a first bearing member having a first bearing surface of generally saddle shaped formed as a part of a surface of revolution with concave circumferential form and convex axial form; and the humeral component including a bifurcated member, and a second bearing member bridging the free ends of the arms of said bifurcated member; said second bearing member having a second bearing surface in mutual articulatory generally complementary bearing engagement with said first bearing surface, and shaped as a surface of revolution with its axis of revolution coincident with that of said first bearing surface and extending between said arm free ends, with convex circumferential form of greater angular extent than that of said first bearing surface, and with concave axial form.
Claim 3
Dependent Claim
26 words
A device according to claim 1 wherein the circumferential curvature of said first bearing surface is greater than the axial curvature of said second bearing surface.
Claim 4
Dependent Claim
43 words
A device according to claim 1 wherein said first bearing member has an overall curved form with an under surface, remote from said first bearing surface, defined by a surface of revolution having an axis parallel to that of said first bearing surface.
Claim 5
Dependent Claim
27 words
A device according to claim 3 wherein said ulnar component comprises a platform member releasably connected with said first bearing member remotely from said first bearing surface.
Claim 6
Dependent Claim
39 words
A device according to claim 4 wherein said first bearing member and said platform member are slidably connected by complementary dovetail-sectioned key and keyway formations respectively formed therein to extend, in the circumferential direction of said first bearing surface.
Claim 7
Dependent Claim
43 words
A device according to claim 5 wherein said platform member has a slot formed in one end thereof to extend parallel to the respective one of said formations, and said first bearing member has a projection from its undersurface engaged with said slot.
Claim 8
Dependent Claim
45 words
A device according to claim 4 wherein said platform member has a low relief configuration formed in its surface remote from said first bearing member, and said bifurcated member has a low relief configuration formed on its arm in mutually outwardly facing surface portions thereof.
Claim 9
Dependent Claim
26 words
A device according to claim 4 wherein said first bearing member is formed and dimensioned to pass through the aperture defined by said second bearing member.
Claim 10
Dependent Claim
51 words
A device according to claim 4 wherein said platform memBer has an intramedullary stem extending integrally from the other end thereof remote from said slot, and said bifurcated member has an intramedullary stem extending integrally from the junction of said arms, both said stems extending generally radially relative to said axis.
Claim 11
Dependent Claim
30 words
A device according to claim 4 wherein said first bearing and platform members are respectively made of plastics material and metal, and said humeral component is of integral metal construction.
References Cited (Backward Citations)
FR1047640A
Cited
US3521302A
Cited
DE1902700A1
Cited
US3656186A
Cited
US3688316A
Cited
US3728742A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |