EP0077681A2
Expired / Lapsed
EP
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Bone fixation screws
Assignee: D Howse & Co Ltd
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Filing: 1982-10-18
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Granted: —
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Expires: 2002-10-18
Abstract
Abstract A bone fixation screw having a shaft 10 with a head 11 at one end and a screw thread 12 at the other end is also provided with a screw thread 15 on the shaft under and adjacent to the head. In use the screw thread 15 will engage with the hard cortex bone to provide a firmer fixation. The head 11 may have in known manner a screw-threaded projection 13 for receiving a nut 14 which can tighten up a fixation plate against the head.
Inventors
- 👤 Derek Leslie Howse
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 19:32
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/80; A61B17/84; A61B17/86; A61B17/8605; F; F16; F16B; F16B5/00; F16B5/02; F16B5/0275
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
40 words
A bone fixation screw having a shaft provided with a head at one end and a screw thread at the other end, which screw is also provided with a screw thread on the shaft under and adjacent to the head.
Claim 2
Dependent Claim
40 words
A bone fixation screw having a shaft provided with a head at one end and a screw thread at the other end, which screw is also provided with a screw thread on the shaft under and adjacent to the head.
Claim 3
Dependent Claim
18 words
A bone fixation screw according to claim 1 wherein the second-said screw thread is immediately under the head.
Claim 4
Dependent Claim
22 words
A bone fixation screw according to claim 1 or claim 2 wherein the shaft has an unthreaded part separating said screw threads.
Claim 5
Dependent Claim
28 words
A bone fixation screw according to any preceding claim wherein the diameter of the screw thread under the head is greater than that of the first-said screw thread.
Claim 6
Dependent Claim
12 words
A bone fixation screw according to any preceding claim which is cannulated.
Claim 7
Dependent Claim
38 words
A bone fixation screw according to any preceding claim having a head shaped like a nut and a projection . from the head on the opposite side from the shaft, which projection is screw-threaded for carrying a nut.
Claim 8
Dependent Claim
22 words
A bone fixation screw according to claim 6 in combination with a perforated fixation plate adapted to be received on the projection.
Claim 9
Dependent Claim
21 words
A bone fixation screw according to any of claims 1 to 5 wherein the head provides one extremity of the screw.
Claim 10
Dependent Claim
13 words
A bone fixation screw according to claim 8 wherein the head is slotted.
Claim 11
Dependent Claim
36 words
A bone fixation screw according to claim 8 or claim 9 wherein the screw thread at the opposite end of the shaft from the head is adjoined by a substantially longer unthreaded part of the shaft.
Claim 12
Dependent Claim
43 words
A bone fixation screw according to any of claims 8 to 10 wherein the screw thread under the head extends over only a minor part of the length of the shaft and a substantial part of the length of the shaft is unthreaded.
References Cited (Backward Citations)
No citation records indexed.
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