US3579830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bone implant
Assignee: Individual
•
Filing: 1969-10-01
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Granted: 1971-05-25
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Expires: 1989-10-01
Abstract
Abstract A bone prothesis implant as disclosed is formed by a metal rod which terminates in a screw in the form of a gimlet of conical pitch with rounded edges. This screw, intended to be introduced into the bone, is characterized in that each of its threads, except that of the point, appears in elevation as a truncated cone, of which the bases are inclined relatively to the axis of the screw. The end of the screw preferably ends in a point, so as to be able easily to penetrate into the bone.
Inventors
- 👤 Joseph Morel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:34
CPC Classifications
A; A61; A61C; A61C8/00; A61C8/0018; A61C8/0022; A61C8/0028; A61C8/0089; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30767; A61F2/30771
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
130 words
An implant for fixation in bone tissue, comprising a metal rod ending in a point, wherein said rod is screw threaded in its portion terminating at said point, said screw having a conical pitch and when viewed in elevation appearing as a succession of truncated cones, each having a base wherein each said cone base is inclined relatively to the axis of said screw, wherein the height of each of said truncated cones is equal to 1 to 2 times the diameter of its larger base, the ratio between the diameter of the large base and the diameter of the small base of the truncated cone is from 1.5 to 2.5, and the angle at the apex of said truncated cones and of said point is from 20* to 45*.
Claim 2
Dependent Claim
130 words
An implant for fixation in bone tissue, comprising a metal rod ending in a point, wherein said rod is screw threaded in its portion terminating at said point, said screw having a conical pitch and when viewed in elevation appearing as a succession of truncated cones, each having a base wherein each said cone base is inclined relatively to the axis of said screw, wherein the height of each of said truncated cones is equal to 1 to 2 times the diameter of its larger base, the ratio between the diameter of the large base and the diameter of the small base of the truncated cone is from 1.5 to 2.5, and the angle at the apex of said truncated cones and of said point is from 20* to 45*.
Claim 3
Dependent Claim
34 words
An implant according to claim 1, particularly intended for odontological prothesis, wherein the external diameter of said screw is from 0.8 to 1.5 mm, and 5 to 15 truncated cones are provided per centimeter.
Claim 4
Dependent Claim
21 words
An implant according to claim 1, wherein the external surface of the threads of the screw carries transverse cavities or striations.
Claim 5
Dependent Claim
18 words
An implant according to claim 1, wherein the overall contour of the screw shows a very slight conicity.
Claim 6
Dependent Claim
37 words
An implant according to claim 1, wherein the end of the rod opposite to the threaded portion carries a mandrel, which is adapted to fit a surgical or odontological instrument and is held fast with the rod.
Claim 7
Dependent Claim
11 words
An implant according to claim 1 formed of a cobalt-chrome alloy.
Claim 8
Dependent Claim
81 words
An implant in accordance with claim 1 wherein the height of each said truncated cone is equal to 1.3 to 1.7 times the diameter of its larger base, the ratio of the diameter of the large base to the same base is 1.75 to 2.25, the angle of inclination of each cone is 30* to 40*, the external diameter of the screw is 0.8 to 1.5 mm, and 6 to 10 cones are provided per centimeter of length of said screw.
References Cited (Backward Citations)
US3466748A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |