Title:
特殊ねじを備える股関節臼
Document Type and Number:
Japanese Patent JP3807681
Kind Code:
B2
Abstract:
PCT No. PCT/DE97/00793 Sec. 371 Date Oct. 21, 1998 Sec. 102(e) Date Oct. 21, 1998 PCT Filed Apr. 21, 1997 PCT Pub. No. WO97/39702 PCT Pub. Date Oct. 30, 1997The invention concerns a screw-in type artificial hip joint socket with a special thread for implantation in human beings. Hip joint sockets of this type usually have a flat thread with parallel teeth flanks or a triangular thread with a neutral teeth position, the axial pitch being conventionally constant. However, such embodiments are unfavourable because they do not take sufficiently into account the forces which arise during implantation as well as during the intended use, or they cause an unnecessarily extensive bone bed destruction during an eventually required explantation. With the invention a purposefully optimization of the hip joint socket thread is provided, wherein the thread profile, the angular orientation of the thread teeth and a non-linear thread pitch is utilized, in order to ensure an effortless screwing, a stable seat in the long term and an unproblematic explantation (FIG. 3).
Inventors:
Hermanns Drufer, Gerd
Application Number:
JP53759597A
Publication Date:
August 09, 2006
Filing Date:
April 21, 1997
Export Citation:
Assignee:
Hermanns Drufer, Gerd
International Classes:
A61F2/34; A61F2/00; A61F2/30
Domestic Patent References:
| JP2218361A | ||||
| JP4226650A | ||||
| JP3037055A |
Foreign References:
| EP0667134A1 | ||||
| DE4408527A1 | ||||
| US4715859 | ||||
| US4919674 | ||||
| WO1995018586A1 |
Attorney, Agent or Firm:
Kuro Fukami
Toshio Morita
Hidehiko Ito
Yutaka Horii
Toshio Morita
Hidehiko Ito
Yutaka Horii