| 摘要 |
PCT No. PCT/CH92/00122 Sec. 371 Date Feb. 9, 1993 Sec. 102(e) Date Feb. 9, 1993 PCT Filed Jun. 24, 1992 PCT Pub. No. WO93/00518 PCT Pub. Date Jan. 7, 1993.The fastener, which is especially adapted for bones, consists of a shaft (2) bearing a thread (1) with variable pitch, a front end (3) and a rear end (4). The thread (1) is present over the entire area of the shaft (2), and in the area of the rear end (4) is characterized by a smaller pitch than in the area of the front end (3). Thanks to the diminishing pitch of the thread (1) in the proximal direction, a locally differentiated intraosseous pressure generation takes place. In accord with the well-known Wolff's Law, this leads to a controlled bone growth along the loading axis and thus an improvement in the stability of the implanted fastener.
|
