Patent US4623349A successfully refreshed from Google Patents.
US4623349A
Expired / Lapsed
US
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Osteal prosthesis and the production thereof
Assignee: Howmedica Osteonics Corp
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Filing: 1983-06-27
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Granted: 1986-11-18
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Expires: 2003-06-27
Abstract
Abstract An osteal prosthesis having an outer surface splined in a direction generally parallel to its mean axis is capable of being secured in the bone without cement, the bone tissue developing so as to at least partly occupy the interior or hollow between the splines. The cross-sectional profile of the splines is such that it imparts a bone tissue retaining capability, and the longitudinal interior surface or hollow of the splines, which are non-cylindrical, has a shape which tapers from the end of the prosthesis (lower end) which is the most deeply embedded in the bone to the other end (upper end), the prosthesis being thus capable of being extracted from the bone tissue by a tractive movement.
Inventors
- 👤 Gerald Lord
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:20
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30767; A61F2/30771; A61F2/32; A61F2/36; A61F2/3662; A61F2/3094; A61F2/367; A61F2/3672; A61F2/3676; A61F2002/30795; A61F2002/308; A61F2002/3082; A61F2002/30827; A61F2002/30828; A61F2002/30878; A61F2002/30879; A61F2/30942; A61F2002/30957; A61F2/3609; A61F2002/3625; A61F2002/3631; A61F2/46; A61F2/4603; A61F2002/4619; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00017
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
149 words
An osteal prosthesis comprising: an elongate stem for insertion and fixing in bone; means at a proximal end of said stem for permitting said stem to be inserted in bone by initial insertion in said bone of a distal end of said stem opposite said proximal end; and spline means on said stem and extending generally in the direction of elongation of said stem, said spline means comprising: (a) a plurality of raised spline elements tapered so as to have increased width towards said proximal end, and (b) a plurality of troughs defined between said spline elements, said troughs being tapered so as to have increased width towards said distal end, wherein the cross-sectional profiles of said spline elements and troughs is such that said spline elements and troughs impart a bone tissue retaining capability and said prosthesis is capable of being extracted from the bone by tractive movement.
Claim 2
Dependent Claim
149 words
An osteal prosthesis comprising: an elongate stem for insertion and fixing in bone; means at a proximal end of said stem for permitting said stem to be inserted in bone by initial insertion in said bone of a distal end of said stem opposite said proximal end; and spline means on said stem and extending generally in the direction of elongation of said stem, said spline means comprising: (a) a plurality of raised spline elements tapered so as to have increased width towards said proximal end, and (b) a plurality of troughs defined between said spline elements, said troughs being tapered so as to have increased width towards said distal end, wherein the cross-sectional profiles of said spline elements and troughs is such that said spline elements and troughs impart a bone tissue retaining capability and said prosthesis is capable of being extracted from the bone by tractive movement.
Claim 3
Dependent Claim
34 words
A prosthesis according to claim 1 wherein the cross-sectional profile of at least some of the spline elements is such as to define at least partly a narrowed part in an adjacent said trough.
Claim 4
Dependent Claim
14 words
A prosthesis according to claim 2, wherein said spline element cross-sectional profile is curvilinear.
Claim 5
Dependent Claim
14 words
A prosthesis according to claim 2, wherein said spline element cross-sectional profile is circular.
Claim 6
Dependent Claim
21 words
A prosthesis according to claim 2, wherein said spline element cross-sectional profile has a combination of circular and noncircular curvilinear portions.
Claim 7
Dependent Claim
21 words
A prosthesis according to claim 5 including rectilinear portions of said spline element cross-sectional profile interconnecting said curvilinear and circular portions.
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) | 1989-11-17 | 1990-05-19 | 1990-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-17 | 1994-05-19 | 1994-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-17 | 1998-05-19 | 1998-11-18 | $7700.00 | Window Closed / Lapsed |