EP0355035A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Bone plate with conical holes
Assignee: AO Technology AG
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Filing: 1987-11-03
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Granted: —
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Expires: 2007-11-03
Abstract
Abstract The implant for osteosynthesis according to the invention comprises a device (21) connectable with a bone (2) with at least two clearance holes (28) and screws (22) with a head (27) for fastening said device (21) rigidly to said bone (2). The clearance holes (28) have the shape of a cone for receiving a correspondingly shaped screw head (27), whereby said cone has a cone angle smaller than the resulting friction angle in the range corresponding to a cone taper of 1:5 to 1:20. It allows operative treatment of bone fractures with minimal vascular damage to the treated bone.
Inventors
- 👤 Slobodan Tepic
- 👤 Stephen M. Perren
- 👤 Franz Sutter
- 👤 Fritz Straumann
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 09:03
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/80; A61B17/8033; A61B17/8047; A61B17/8052
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
84 words
An implant for osteosynthesis, comprising a device (21) connectable with a bone (2) with at least two clearance holes (28) and screws (22) with a head (27) for fastening said device (21) rigidly to said bone (2), characterized in that said clearance holes (28) have the shape of a cone for receiving a correspondingly shaped screw head (27), whereby said cone has a cone angle smaller than the resulting friction angle, preferably in the range corresponding to a cone taper of 1:5 to 1:20.
Claim 2
Dependent Claim
84 words
An implant for osteosynthesis, comprising a device (21) connectable with a bone (2) with at least two clearance holes (28) and screws (22) with a head (27) for fastening said device (21) rigidly to said bone (2), characterized in that said clearance holes (28) have the shape of a cone for receiving a correspondingly shaped screw head (27), whereby said cone has a cone angle smaller than the resulting friction angle, preferably in the range corresponding to a cone taper of 1:5 to 1:20.
Claim 3
Dependent Claim
53 words
Implant according to claim 1, characterized in that a third body (30) is provided fitting in said clearance hole (28) which is expandable by the conical screw head (27) having a cone angle being smaller than the resulting friction angle, preferably in the range corresponding to a cone taper of 1:5 to 1:20.
Claim 4
Dependent Claim
27 words
Implant according to claim 1 or 2, characterized in that said screws (22) have a reduced length for engagement only with one cortex of said bone (2).
Claim 5
Dependent Claim
18 words
Implant according to one of the claims 1 to 3, characterized in that said screws (22) are self-tapping.
Claim 6
Dependent Claim
47 words
Implant according to one of the claims 1 to 4, characterized in that the contact surface (23) of said device (21) to said bone (2) is reduced to the level necessary only for initially locking said screws (22) to said device (21) at the time of insertion.
Claim 7
Dependent Claim
34 words
Implant according to one of the claims 1 to 5, characterized in that the contact surface of the underside (24) of said device (21) to said bone (2) is reduced to point-like areas (23).
Claim 8
Dependent Claim
45 words
Implant according to one of claims 1 to 6, characterized in that the contact surface of the underside (24) of said device (21) to said bone (2) is less than 5%, preferably less than 2% of the full undersurface area (24) of said device (21).
Claim 9
Dependent Claim
67 words
Implant according to one of the claims 1 to 7, characterized in that the contact surface of the underside (24) of said device (21) to said bone (2) consists of contact buds (29) made of a material which is resorbable or dissoluble in body fluids, preferably in the form of resorbable or dissoluble buds (29) applied on the normal unstructured bone contact surface of said device (21).
Claim 10
Dependent Claim
38 words
Implant according to one of the claims 1 to 8, characterized in that additional clip-on springs (37) are provided for mounting on said device (21) which form bud-like extensions (38) on the undersurface (24) of said device (21).
Claim 11
Dependent Claim
20 words
Implant according to one of the claims 1 to 9, characterized in that said device (21) is of plate-like form.
Claim 12
Dependent Claim
31 words
Implant according to one of the claims 1 to 10, characterized in that said screw heads (27) are expandable by means of a third body (35) insertable into said head (27).
Claim 13
Dependent Claim
25 words
Implant according to claim 1 or 11, characterized in that at least one of said clearance holes (28) is designed as a self compressing hole.
Claim 14
Dependent Claim
26 words
Implant according to one of the claims 1 to 12, characterized in that only one of said clearance holes (28) is designed as self compressing hole.
References Cited (Backward Citations)
No citation records indexed.
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