US3843975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prosthesis for femoral shaft
Assignee: Individual
•
Filing: 1973-04-09
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Granted: 1974-10-29
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Expires: 1993-04-09
Abstract
Abstract A prosthesis for femoral shaft having a ball at one end, a medullary stem at the other end, a neck connecting the ball to the stem, a head at the connection between the stem and the neck and including means for fastening the prosthesis to the femur and outrigger knives on the head on either side of the head oriented to dig into the femur, from the side so that the bone fits between the knives.
Inventors
- 👤 R Tronzo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:18
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61F2/3662; A61F2/30721; A61F2/30739; A61B; A61B17/00; A61B17/32; A61F2/30767; A61F2/367; A61F2/30771; A61F2002/30841
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
In a prosthesis for a femoral shaft fixation, a ball at one end, a medullary stem at the other end, a neck connecting the ball and the stem, a head at the connection between the stem and the neck and including means for fastening the medullary stem to the bone and outrigger knives on the head, oriented for insertion into the bone, having on the outside surface of the medullary stem from 20 to 50 percent pore area, at least 100 microns in depth of pores, between 20 and 40 percent of the surface pore area being small pores of between 50 and 200 microns diameter, between 20 and 40 percent of the surface pore area being intermediate pores of between about 200 and 800 microns in diameter, and between 20 and 40 percent of the surface pore area being large pores exceeding 800 and not exceeding 3500 microns in diameter.
Claim 2
Dependent Claim
151 words
In a prosthesis for a femoral shaft fixation, a ball at one end, a medullary stem at the other end, a neck connecting the ball and the stem, a head at the connection between the stem and the neck and including means for fastening the medullary stem to the bone and outrigger knives on the head, oriented for insertion into the bone, having on the outside surface of the medullary stem from 20 to 50 percent pore area, at least 100 microns in depth of pores, between 20 and 40 percent of the surface pore area being small pores of between 50 and 200 microns diameter, between 20 and 40 percent of the surface pore area being intermediate pores of between about 200 and 800 microns in diameter, and between 20 and 40 percent of the surface pore area being large pores exceeding 800 and not exceeding 3500 microns in diameter.
References Cited (Backward Citations)
GB1215737A
Cited
US3605123A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |