Screwdriver for bone screws

US8087329B2 · kind B2 · utility

Assignee

• Aesculap AG · DE

Inventors

• Joerg Schumacher · Teltow, DE
• Ulrich Kramer · Bensberg, DE

Key dates

• Filing date: Feb 15, 2008
• Grant date: Jan 3, 2012
• Expiry date: Jul 3, 2030

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B25B23/108
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

In a screwdriver for bone screws, having a handle and rotationally fixedly held thereon a shaft, the free end of which has a non-circular cross section and is insertable in a positively locked manner in a non-circular receiving opening in the head of a bone screw, at least one expander element being mounted so as to be displaceable in the longitudinal direction in the shaft and so as to slide, when displaced in the longitudinal direction, along a slide surface in the area of the free end of the shaft in such a way that it projects laterally over the contour of the shaft, in order to simplify the actuation of the at least one expander element, it is proposed that the at least one expander element be pretensioned by an elastic spring element in the direction towards the free end of the shaft and be retractable against the action of the spring element in the shaft until it no longer projects laterally over the contour of the shaft.