EP0705572A2
Expired / Lapsed
EP
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Locking plate and bone screw
Assignee: AO Technology AG
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Filing: 1995-05-16
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Granted: —
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Expires: 2015-05-16
Abstract
Abstract The bone plate comprises an upper surface (6) and a lower surface for application to a bone, characterized in that the lower surface (10) is curved to conform to a cylindrical bone and the upper surface (6) has two intersecting planes (7,8).
Inventors
- 👤 Linda Trebing
- 👤 John Thalgott
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 20:46
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/84; A61B17/86; A61B17/8605; A61B17/14; A61B17/15; A61B17/16; A61B17/17; A61B17/1728; A61B17/70; A61B17/7059; A61B17/80; A61B17/8061; A61B17/8625; A61B17/863; A61B17/1739; A61B17/1757; A61B17/8004; A61B17/8052; A61B17/8057
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
37 words
Bone plate comprising an upper surface and a lower surface for application to a bone, characterized in that the lower surface is curved to conform to a cylindrical bone and the upper surface has two intersecting planes.
Claim 2
Dependent Claim
46 words
Bone plate according to claim 1, characterized in that it further comprises a first screw hole in said plate having an axis normal to one of said intersecting planes and a second screw hole in said plate having an axis normal to the other intersecting plane.
Claim 3
Dependent Claim
25 words
Bone plate according to claim 2, characterized in that it further comprises a third screw hole which is unthreaded and furnished with a camming surface.
Claim 4
Dependent Claim
64 words
Bone plate for stabilizing the anterior column of the spine comprising an elongated body of physiologically acceptable metal curved in its longitudinal dimension and having an anterior edge and a posterior edge, characterized in that said anterior edge has a notch and screw holes at the ends of said notch, and that said posterior edge is concave and has screw holes at its ends.
Claim 5
Dependent Claim
14 words
Bone plate according to claim 4, characterized in that said screw holes are threaded.
Claim 6
Dependent Claim
18 words
Bone plate according to claim 5, characterized in that it further comprises a plurality of unthreaded screw holes.
Claim 7
Dependent Claim
37 words
Bone plate for stabilizing the anterior column of the spine having a plurality of threaded screw holes to receive locking screws, characterized in that it further comprises at least one hole, unthreaded, to receive temporary anchoring screws.
Claim 8
Dependent Claim
34 words
Bone plate according to claim 7, characterized in that it comprises an upper surface having a plurality of intersecting planes at least one of said threaded screw holes being in each of said plane.
Claim 9
Dependent Claim
24 words
Bone plate according to claim 8, characterized in that said threaded screw holes have axes normal to the plane on which they are located.
Claim 10
Dependent Claim
35 words
Bone plate according to one of the claims 7 - 9, characterized in that said plate has an anterior edge and a posterior edge, said anterior edge having a notch for receiving a manipulation instrument.
Claim 11
Dependent Claim
14 words
Bone plate according to claim 10, characterized in that said posterior edge is curved.
Claim 12
Dependent Claim
53 words
Bone plate comprising an upper surface and a lower surface, the lower surface being curved for application to a bone and the upper surface having two intersecting planes, in combination with at least one screw hole in each of the planes of said upper surface, said screw holes having axes which are skewed.
Claim 13
Dependent Claim
21 words
Bone plate according to claim 12, characterized in that it further includes a plurality of elongated screw holes having camming surfaces.
Claim 14
Dependent Claim
57 words
Bone screw comprising a shaft, a head and a tip, characterized in that the position of the shaft adjacent said tip has a single start buttress thread and that portion adjacent the head has a two-start machine screw thread, the threads taken as a whole being of constant pitch and the lead being continuous over both threads.
Claim 15
Dependent Claim
14 words
Bone screw according to claim 14, characterized in that it has a pointed tip.
Claim 16
Dependent Claim
16 words
Bone screw according to claim 15, characterized in that it has cutting plates adjacent said tip.
Claim 17
Dependent Claim
42 words
Screw for orthopaedic use comprising a shaft having a tip and a head, characterized in that further comprises a buttress thread adjacent said tip for engagement with cancellous bone and a machine screw thread adjacent said head for engagement with cortical bone.
Claim 18
Dependent Claim
16 words
Screw according to claim 17, characterized in that said machine screw thread is a two-start thread.
Claim 19
Dependent Claim
23 words
Screw according to claim 17 or 18, characterized in that the pitch of said threads is constant over the lengths of said threads.
Claim 20
Dependent Claim
61 words
An orthopaedic fixation system for use in spinal surgery, characterized in that it comprises a bone plate having a plurality of threaded screw holes for receiving locking screws and a plurality of locking screws, each of said screws having a section of single start buttress threads and a section of two-start machine threads the lead being continuous over said two sections.
Claim 21
Dependent Claim
70 words
An orthopaedic fixation system for use in spinal surgery comprising a bone plate having a lower surface for application to the spinal column, an upper surface having two intersecting planes and a threaded screw for each of said screw holes, characterized in that each of said screws has a buttress thread for engagement with cancellous bone and a machine screw thread for engagement with said screw holes and cortical bone.
References Cited (Backward Citations)
No citation records indexed.
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