US4004300A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Femoral prosthesis
Assignee: Individual
•
Filing: 1975-10-09
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Granted: 1977-01-25
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Expires: 1995-10-09
Abstract
Abstract A femoral prosthesis comprising a shank, a neck integral with the shank, and a detachable ball head supported on the neck and interchangeable with other ball heads of different external size whereby a common shank and neck can support a ball head of desired external size.
Inventors
- 👤 Thomas Anthony English
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:36
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61F2/3609; A61F2/34; A61F2002/30001; A61F2002/30316; A61F2002/30329; A61F2002/30331; A61F2002/30354; A61F2002/30405; A61F2/3094; A61F2002/30975; A61F2002/3611; A61F2002/365; A61F2/3662; A61F2002/3678; A61F2002/3686; A61F2220/00; A61F2220/0025; A61F2220/0033
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
120 words
A femoral prosthesis of the type having a shank, a neck extending from the shank and fixed ball head carried by the neck, which prosthesis comprises, in combination: a. a split detachable liner for completely enclosing and conforming to the shape of the fixed ball head and a portion of the neck adjacent thereto, which liner includes a first screw thread on a portion of its outer surface; and b. a detachable ball head having a recess corresponding substantially to the outer configuration of the liner, which recess includes a second screw thread corresponding to the first screw thread such that the liner may be snugly fitted and secured within the recess by engaging the first and second screw threads.
Claim 2
Dependent Claim
120 words
A femoral prosthesis of the type having a shank, a neck extending from the shank and fixed ball head carried by the neck, which prosthesis comprises, in combination: a. a split detachable liner for completely enclosing and conforming to the shape of the fixed ball head and a portion of the neck adjacent thereto, which liner includes a first screw thread on a portion of its outer surface; and b. a detachable ball head having a recess corresponding substantially to the outer configuration of the liner, which recess includes a second screw thread corresponding to the first screw thread such that the liner may be snugly fitted and secured within the recess by engaging the first and second screw threads.
Claim 3
Dependent Claim
16 words
The femoral prosthesis of claim 1 wherein the split liner includes two substantially identical half sections.
Claim 4
Dependent Claim
20 words
The femoral prosthesis of claim 2 wherein the half sections include alignment means for facilitating the assembly of the liner.
Claim 5
Dependent Claim
32 words
The femoral prosthesis of claim 3 wherein the alignment means includes at least one pin carried by one half section and a corresponding pin bore hole formed in the other half section.
Claim 6
Dependent Claim
13 words
The femoral prosthesis of claim 1 wherein the liner is of plastic material.
Claim 7
Dependent Claim
29 words
The femoral prosthesis of claim 1 wherein the recess in the detachable ball head includes a substantially hemispherical portion for mating with a corresponding hemispherical portion on the liner.
Claim 8
Dependent Claim
22 words
The femoral prosthesis of claim 1 wherein the liner includes an abutment surface for retaining the liner in the detachable ball head.
Claim 9
Dependent Claim
45 words
The femoral prosthesis of claim 1 wherein the liner includes: a. a substantially hemispherical portion for seating against the bottom of the recess in the detachable ball head; and b. two substantially identical half sections having the first screw thread formed on their outer surfaces.
Claim 10
Dependent Claim
27 words
The femoral prosthesis of claim 1 further including means for cooperating with spanners to thereby facilitate the engagement and disengagement of the first and second screw threads.
Claim 11
Dependent Claim
23 words
The femoral prosthesis of claim 9 wherein said means includes recesses formed in the liner and outer surface of the detachable ball head.
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) | 1980-01-25 | 1980-07-26 | 1981-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-25 | 1984-07-26 | 1985-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-25 | 1988-07-26 | 1989-01-25 | $7700.00 | Window Closed / Lapsed |