Patent US4611587A successfully refreshed from Google Patents.
US4611587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for cutting threads in the walls of the acetabular cavity in humans
Assignee: Individual
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Filing: 1984-09-24
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Granted: 1986-09-16
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Expires: 2004-09-24
Abstract
Abstract The invention relates to total hip joint replacements in humans in which the ball-like head of the femur and the cup-shaped cavity of the acetabulum are replaced by metal, plastic or ceramic substitutes and, more particularly, to a device for cutting screw threads in the walls of the acetabulum to receive a threaded substitute hip socket.
Inventors
- 👤 Roy Y. Powlan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:59
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/16; A61B17/1662; A61B17/1664; A61B17/1666; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61F2/30767; A61F2/30771; A61F2002/3085; A61F2/3609; A61F2002/3611; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00029; A61F2310/00179
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
77 words
A device for forming threads in the wall of the acetabular cavity, said device comprising: (a) a cutting head shaped to closely fit within the acetabular cavity, (b) means for positioning said cutting head relative to the cavity, (c) a single cutting tool mounted to project exteriorly of said cutting head, and (d) means for driving the cutting tool in a spiral path so as to cut threads in the generally hemispherical wall of the acetabular cavity.
Claim 2
Independent Claim
77 words
A device for forming threads in the wall of the acetabular cavity, said device comprising: (a) a cutting head shaped to closely fit within the acetabular cavity, (b) means for positioning said cutting head relative to the cavity, (c) a single cutting tool mounted to project exteriorly of said cutting head, and (d) means for driving the cutting tool in a spiral path so as to cut threads in the generally hemispherical wall of the acetabular cavity.
Claim 3
Dependent Claim
23 words
A thread-forming device as set forth in claim 1 wherein the cutting head is carried by the positioning means and rotatable relative thereto.
Claim 4
Dependent Claim
39 words
A thread-cutting device as set forth in claim 2 wherein the positioning means are mounted on a central shaft and the driving means for the cutting tool comprises a drive shaft surrounding the central shaft and rotatable relative thereto.
Claim 5
Dependent Claim
47 words
A thread-cutting device as set forth in claim 3 wherein the central shaft is provided with a lead screw and the the drive shaft with screw thread followers whereby relative rotation of the drive shaft and the central shaft moves the cutting tool through a spiral path.
Claim 6
Dependent Claim
38 words
A thread-cutting device as set forth in claim 4 wherein the central shaft and drive shaft are each provided with manual means for holding the central shaft aligned relative to said cavity and for rotating the drive shaft.
Claim 7
Independent Claim
132 words
A device for cutting threads in the wall of the acetabular cavity, said device comprising: (a) a central shaft having a screw thread formed therein, (b) an alignment disk on one end of the central shaft having means for preventing rotation of the central shaft, (c) a cutting head rotatably mounted on said central shaft and having a longitudinal slot formed therein, (d) a cutting tool mounted in and extending exteriorly of the slot in said cutting head, (e) a drive shaft for the cutting tool and cutting head rotatable relative to the central shaft and having thread followers for engagement with the screw thread on the central shaft, and (f) handle means for rotating the drive shaft relative to the central shaft to rotate the cutting tool in a spiral path.
Claim 8
Independent Claim
132 words
A device for cutting threads in the wall of the acetabular cavity, said device comprising: (a) a central shaft having a screw thread formed therein, (b) an alignment disk on one end of the central shaft having means for preventing rotation of the central shaft, (c) a cutting head rotatably mounted on said central shaft and having a longitudinal slot formed therein, (d) a cutting tool mounted in and extending exteriorly of the slot in said cutting head, (e) a drive shaft for the cutting tool and cutting head rotatable relative to the central shaft and having thread followers for engagement with the screw thread on the central shaft, and (f) handle means for rotating the drive shaft relative to the central shaft to rotate the cutting tool in a spiral path.
Claim 9
Independent Claim
103 words
A device for cutting threads in the wall of the acetabular cavity, said device comprising: (a) a rotatable cutting head shaped to substantially conform to the shape and size of the acetabular cavity and having a longitudinal opening therein, (b) a cutting tool located within the cutting head and having a cutting tool bit extending exteriorly of said cutting head through the opening, (c) means resiliently biasing the cutting tool bit outwardly of said cutting head, and (d) means for driving the cutting tool bit in a spiral path so as to cut threads in the generally hemispherical wall of the acetabular cavity.
Claim 10
Independent Claim
103 words
A device for cutting threads in the wall of the acetabular cavity, said device comprising: (a) a rotatable cutting head shaped to substantially conform to the shape and size of the acetabular cavity and having a longitudinal opening therein, (b) a cutting tool located within the cutting head and having a cutting tool bit extending exteriorly of said cutting head through the opening, (c) means resiliently biasing the cutting tool bit outwardly of said cutting head, and (d) means for driving the cutting tool bit in a spiral path so as to cut threads in the generally hemispherical wall of the acetabular cavity.
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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) | 1989-09-15 | 1990-03-17 | 1990-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-15 | 1994-03-17 | 1994-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-15 | 1998-03-17 | 1998-09-16 | $7700.00 | Window Closed / Lapsed |