US4938772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Femoral prosthesis
Assignee: Sulzer AG
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Filing: 1989-10-03
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Granted: 1990-07-03
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Expires: 2009-10-03
Abstract
Abstract The prosthesis stem is provided with a recess on each side having boundary walls concentric to a common center of curvature. Each recess receives a molding which carries a wire mesh structure for the invasion of bone tissue after implantation. Bending of the proximal zone of the stem occurs without movement of the molding so that shear stresses are not imposed upon the bone tissue invading the wire mesh. A peg-like projection on each molding fits with a clearance in a further recess in the metal stem to avoid accidential sliding out of each recess.
Inventors
- 👤 Otto Frey
- 👤 Rudolf Kock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:03
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30721; A61F2/30734; A61F2/30767; A61F2/30907; A61F2/32; A61F2/36; A61F2/3662; A61F2/367; A61F2002/30929
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
83 words
A femoral prosthesis comprising: a metal stem having a recess in a proximal zone of each of two opposite sides thereof, each recess having a proximal boundary wall and a distal boundary wall, said walls being disposed an concentric arcs having a common center of curvature distal of said walls; at least one plastic molding inserted in each recess, each molding having curved surfaces engaging said walls of a respective recess; and a surface structure on each molding for an ingrowth of tissue.
Claim 2
Dependent Claim
83 words
A femoral prosthesis comprising: a metal stem having a recess in a proximal zone of each of two opposite sides thereof, each recess having a proximal boundary wall and a distal boundary wall, said walls being disposed an concentric arcs having a common center of curvature distal of said walls; at least one plastic molding inserted in each recess, each molding having curved surfaces engaging said walls of a respective recess; and a surface structure on each molding for an ingrowth of tissue.
Claim 3
Dependent Claim
22 words
A prosthesis as set forth in claim 1 wherein each wall extends laterally to medially over an entire side of said stem.
Claim 4
Dependent Claim
32 words
A femoral prosthesis as set forth in claim 1 which further comprises a second recess within each recess of said stem and a peg-like projection on each molding fitting into second recess.
Claim 5
Dependent Claim
31 words
A femoral prosthesis as set forth in claim 1 wherein said molding on one side said stem is of different thickness from said molding on the other side of said stem.
Claim 6
Dependent Claim
20 words
A femoral prosthesis as set forth in claim 4 wherein each molding is of increasing thickness in a proximal direction.
Claim 7
Dependent Claim
19 words
A femoral prosthesis as set forth in claim 1 wherein each molding is of increasing in a proximal direction.
Claim 8
Dependent Claim
24 words
A femoral prosthesis as set forth in claim 1 wherein each recess is of dove-tail cross-section and slidably receives a respective plastic molding therein.
Claim 9
Dependent Claim
32 words
A femoral prosthesis as set forth in claim 7 which further comprises a second recess with each recess of said stem and a peg-like on each molding fitting into said second recess.
Claim 10
Dependent Claim
83 words
A femoral prosthesis comprising a metal stem having a recess in a proximal zone on at least one side thereof, said recess having a proximal boundary wall and a distal boundary wall, said walls being disposed an concentric ars having a common center of curvature distal of said walls; at least one plastic molding inserted in said recess, each molding having curved surfaces slidably engaging said walls of a respective recess; and a surface structure on each molding for an ingrowth of tissue.
Claim 11
Dependent Claim
83 words
A femoral prosthesis comprising a metal stem having a recess in a proximal zone on at least one side thereof, said recess having a proximal boundary wall and a distal boundary wall, said walls being disposed an concentric ars having a common center of curvature distal of said walls; at least one plastic molding inserted in said recess, each molding having curved surfaces slidably engaging said walls of a respective recess; and a surface structure on each molding for an ingrowth of tissue.
Claim 12
Dependent Claim
22 words
A prosthesis as set forth in claim 9 wherein each wall extends laterally to medially over an entire side of said stem.
Claim 13
Dependent Claim
36 words
A femoral prosthesis as set forth in claim 10 which further comprises a second recess with said recess of said stem and a peg-like projection on said molding fitting into said second recess with a clearance.
Claim 14
Dependent Claim
16 words
A femoral prosthesis as set forth in claim 10 wherein said recess is of dove-tail cross-section.
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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) | 1993-07-02 | 1994-01-01 | 1994-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-02 | 1998-01-01 | 1998-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-02 | 2002-01-01 | 2002-07-03 | $7700.00 | Window Closed / Lapsed |