Patent · US Expired

Bone screw

US5169400A · kind A · utility

451Cited by

8References

15Claims

0Family size

Assignee

Aesculap AG · DE

Inventors

Joachim Muhling · Bergneustadt, DE
Theodor Lutze · Spaichingen, DE
Hans Pistner · Würzburg, DE
Achim Hurst · Tuttlingen, DE

Key dates

Filing date	Nov 9, 1990
Grant date	Dec 8, 1992
Priority date	—
Expiry date	Nov 9, 2010

Classification

Technology area (CPC A)Human Necessities
CPC primaryA61B17/8875
WIPO fieldMedical technology
WIPO sectorInstruments

Abstract

In order to reduce the risk that a bone screw, in particular one made of resorbing plastic material, with an externally threaded shaft will be destroyed by high screw-in torques, it is proposed that an insertion channel open at the top, arranged concentrically with the shaft and extending along most of the length of the shaft be located in the shaft for an insertion tool and have a cross-section which is non-circular and corresponds to the cross-section of the screwing-in tool.

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