Claims
- 1. An implant for osteosynthesis comprising a biocompatible device for attachment to a bone, and a plurality of screws for attaching the device to the bone, the heads of said screws and the device having a predetermined friction angle relative to one another, said screws having conical heads and said device having complementary conical holes for receiving said heads in surface contact therewith, the cone angle of the conical holes being less than the friction angle between the holes and the screw head, thereby locking said screws to said device to prevent said device from sliding down the screw heads.
- 2. The implant claimed in claim 1, wherein the cone defining the hole has a cone taper of from about 1:5 to about 1:20.
- 3. The implant claimed in claim 1, wherein said device includes a plurality of clearance holes, each of said clearance holes having a compressible insert, each insert having one of said conical holes.
- 4. The implant claimed in claim 1, wherein the screws are self-tapping.
- 5. The implant claimed in claim 1, wherein the length of the screws are such that they will engage only one of the cortices of the bone to which the device is applied.
- 6. The implant claimed in claim 1, wherein the contact of the underside of said device with said bone is at a plurality of points.
- 7. The implant claimed in claim 1, wherein the device has a undersurface for application to the surface of a bone to be treated, the bone contact areas of said undersurface being less than 5% of the full undersurface area.
- 8. The implant claimed in claim 7, wherein the bone contact area is less than 2% of the full undersurface area.
- 9. Implant as claimed in claim 7, wherein the bone contact areas of the undersurface consist of contact studs made of a material which resorbable or dissoluble in body fluids.
- 10. The implant claimed in claim 1 and comprising clip-on springs mounted on said device and forming extensions on the undersurface of said device.
- 11. The implant claimed in claim 1, wherein said device is a plate.
- 12. The implant claimed in claim 1, wherein the heads of said screws have sockets and including elements for insertion into the sockets of said screw heads to expand said screw heads.
- 13. The implant claimed in claim 1, wherein the device includes a self compressing screw hole.
- 14. The implant claimed in claim 13, wherein the device includes a self-compressing screw hole.
Priority Claims (1)
Number |
Date |
Country |
Kind |
PCT/EP87/00663 |
Nov 1987 |
EPX |
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Parent Case Info
This application is a division of our copending application Ser. No. 492,403, filed Mar. 8, 1990, now U.S. Pat. No. 5,053,036, which application is a continuation of our application Ser. No. 247,357, filed Sep. 21, 1988, and is now abandoned.
Foreign Referenced Citations (2)
Number |
Date |
Country |
0048038 |
Mar 1982 |
EPX |
2933637 |
Apr 1980 |
DEX |
Divisions (1)
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Number |
Date |
Country |
Parent |
492403 |
Mar 1990 |
|
Continuations (1)
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Number |
Date |
Country |
Parent |
247357 |
Sep 1988 |
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