Patent · US Expired

Threaded fastener especially for orthopaedic purposes

US5403136A · kind A · utility

153Cited by
10References
5Claims
0Family size

Assignee

Inventor

Key dates

Filing dateFeb 9, 1993
Grant dateApr 4, 1995
Priority date—
Expiry dateFeb 9, 2013

Classification

  • Technology area (CPC A)Human Necessities
  • CPC primaryA61B17/863
  • WIPO fieldMedical technology
  • WIPO sectorInstruments

Abstract

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.