US4634445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Joint prosthesis
Assignee: OEC Europe Ltd
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Filing: 1982-01-29
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Granted: 1987-01-06
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Expires: 2002-01-29
Abstract
Abstract A small joint spacing prosthesis comprises an elongate silicone rubber body reinforced by a Dacron or nylon string and is made by moulding the body with the string therein. The middle of the body forms a spacer of spherical shape with flat end faces providing shoulders for abutment of the bone ends. The remainder of the body forms intramedullary stems with rounded outer ends.
Inventors
- 👤 Basil H. Helal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:30
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/42; A61F2/4225; A61F2/3094; A61F2/30965; A61F2/4241; A61F2/30721; A61F2/30724; A61F2002/30001; A61F2002/30003; A61F2002/3006; A61F2002/30069; A61F2002/30108; A61F2002/30199; A61F2002/30286; A61F2002/30316; A61F2002/30535; A61F2002/30563; A61F2002/4233; A61F2002/4243; A61F2002/4251; A61F2002/4256; A61F2002/4258; A61F2230/00; A61F2230/0063
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
126 words
A joint prosthesis comprising: a spacer for insertion between first and second bones, and, first and second intermedullary stems extending from opposite ends of said spacer for insertion into said bones and remaining slidable within said bones, the spacer having a greater width than the stems and thus is relatively more rigid than said stems, said spacer including at least two shoulders, said shoulders being designed and arranged to abut said bones when said stems are implanted therein where the spacer is spherically shaped and said shoulders define flat end faces, said spacer and said stems being designed and arranged such that when the prosthesis is implanted in said bones, bending of the joint prosthesis occurs in each of the stems and not in the spacer.
Claim 2
Dependent Claim
126 words
A joint prosthesis comprising: a spacer for insertion between first and second bones, and, first and second intermedullary stems extending from opposite ends of said spacer for insertion into said bones and remaining slidable within said bones, the spacer having a greater width than the stems and thus is relatively more rigid than said stems, said spacer including at least two shoulders, said shoulders being designed and arranged to abut said bones when said stems are implanted therein where the spacer is spherically shaped and said shoulders define flat end faces, said spacer and said stems being designed and arranged such that when the prosthesis is implanted in said bones, bending of the joint prosthesis occurs in each of the stems and not in the spacer.
Claim 3
Dependent Claim
18 words
A prosthesis according to claim 1, wherein said one piece has been molded with said flexible member therein.
Claim 4
Dependent Claim
14 words
A prosthesis according to claim 1, wherein said stems have their terminal ends rounded.
Claim 5
Dependent Claim
16 words
A joint prosthesis according to claim 1 wherein said prosthesis is comprised of an elastomeric material.
Claim 6
Dependent Claim
17 words
A joint prosthesis according to claim 4 wherein said prosthesis has an elongated flexible member embedded therein.
Claim 7
Dependent Claim
16 words
A joint prosthesis according to claim 5 wherein said flexible member is a piece of string.
Claim 8
Dependent Claim
24 words
A joint prosthesis according to claim 1 wherein said spacer and said stems are in one piece and are made of unitary elastomeric material.
Claim 9
Dependent Claim
20 words
A joint prosthesis according to claim 7 wherein said spacer and said stems have an elongated flexible member embedded therein.
Claim 10
Dependent Claim
16 words
A joint prosthesis according to claim 8 wherein said flexible member is a piece of string.
Claim 11
Dependent Claim
26 words
A joint prosthesis according to claim 1 wherein said spacer and said stems are a solid piece of elastomeric material having a flexible member embedded therein.
Claim 12
Dependent Claim
16 words
A joint prosthesis according to claim 10 where said stems are of a substantially constant thickness.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-01-05 | 1990-07-07 | 1991-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-05 | 1994-07-07 | 1995-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-05 | 1998-07-07 | 1999-01-06 | $7700.00 | Window Closed / Lapsed |