US5580352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Distal shaft with fast and slow screw threads
Assignee: Individual
•
Filing: 1991-06-06
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Granted: 1996-12-03
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Expires: 2011-06-06
Abstract
Abstract A femoral prosthesis adapted for insertion into the medullary cavity of a femur. The prosthesis including a distal shaft, a neck portion detachable from the distal shaft and a joint head detachable from the neck portion. The distal shaft having two spaced tapered threaded portion thereabout with differing pitch to prevent undesired counter rotation of the prosthesis thereby preventing axial withdrawal of the distal shaft from the femur.
Inventors
- 👤 Ronald Sekel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:44
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61F2/3662; A61F2/367; A61F2/3676; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30138; A61F2002/30143; A61F2002/30316; A61F2002/30329; A61F2002/30331; A61F2002/30332; A61F2002/30339; A61F2002/30535; A61F2002/30604; A61F2002/30616; A61F2/30767; A61F2/30771; A61F2002/3085; A61F2002/30859; A61F2/3609; A61F2002/3611; A61F2002/3625; A61F2002/365; A61F2002/3652; A61F2/46; A61F2/4603; A61F2002/4619; A61F2220/00; A61F2220/0025; A61F2220/0033; A61F2230/00; A61F2230/0002; A61F2230/0017; A61F2310/00; A61F2310/00389; A61F2310/00592; A61F2310/00796
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
86 words
A distal shaft for use with a hip prosthesis which includes a detachable elbow component and a detachable head component, the shaft being insertable wholly within and in axial alignment with a medullary cavity of a femur, the shaft having a flared proximal end provided with a tapered recess in axial alignment with the shaft for receiving the elbow component and also having a tapered distal end, the shaft being provided with a first helical thread and a second helical thread spaced apart from one another.
Claim 2
Dependent Claim
86 words
A distal shaft for use with a hip prosthesis which includes a detachable elbow component and a detachable head component, the shaft being insertable wholly within and in axial alignment with a medullary cavity of a femur, the shaft having a flared proximal end provided with a tapered recess in axial alignment with the shaft for receiving the elbow component and also having a tapered distal end, the shaft being provided with a first helical thread and a second helical thread spaced apart from one another.
Claim 3
Dependent Claim
45 words
A distal shaft according to claim 1 wherein the first thread is a wide tapered helical thread located proximately to the flared proximal end of the shaft and the second thread is a narrow helical thread disposed towards the narrow distal end of the shaft.
Claim 4
Dependent Claim
19 words
A distal shaft according to claim 2 wherein the threads are equal in length with respect to the shaft.
Claim 5
Dependent Claim
19 words
A distal shaft according to claim 2 wherein the threads are different in length with respect to the shaft.
Claim 6
Dependent Claim
46 words
A distal shaft according to claim 1 wherein said first and second threads are structured to have different helix configurations such that when said shaft is inserted into the medullary cavity of a femur, said first and second threads induce a compression force into the femur.
Claim 7
Dependent Claim
19 words
A distal shaft according to claim 5 wherein the said first thread and said second thread have similar pitches.
Claim 8
Dependent Claim
19 words
A distal shaft according to claim 5 wherein the said first thread and said second thread have different pitches.
Claim 9
Dependent Claim
27 words
A distal shaft according to claim 5 wherein the elbow component is capable of rotation relative to the shaft prior to effecting tight interfitting with the shaft.
Claim 10
Dependent Claim
18 words
A distal shaft according to claim 5 wherein the tapered recess in the shaft is a Morse taper.
Claim 11
Dependent Claim
28 words
A distal shaft according to claim 1 wherein the first and the second helical thread are spaced apart from one another by a threadless section of the shaft.
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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) | 1999-12-03 | 2000-06-03 | 2000-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-12-03 | 2004-06-03 | 2004-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-12-03 | 2008-06-03 | 2008-12-03 | $7700.00 | Window Closed / Lapsed |