Patent ID: 7947048
Filing Date: 2011-05-24
Classification: A61B,B25B,Y10S

Abstract:
1. A screwdriver for handling a screw in a body of a person or an animal, comprising: a handle, a stem permanently connected to said handle, said stem having a distal end to which a screw can be fitted, an outer tube surrounding said stem, and a locking mechanism for locking said outer tube in at least three different axial displacement positions relative to said stem, said locking mechanism having a locking element engaging into a locking point in each of said at least three different axial displacement positions of said outer tube, wherein said locking element is prevented from moving further in an axial direction at each locking point by a barrier, said barrier can be overcome only by rotating said outer tube and said stem relative to one another about a longitudinal axis, said locking element runs in a guide whose path deviates from a longitudinal axis by an angle α from one locking point to a next locking point, resulting in a stepped path, said stepped path having a locking point at a maximal advanced axial displacement position, and wherein said stepped path is connected to a return path extending from said maximal axial displacement position backwards to a level of a proximal end of said stepped path, and wherein said return path runs beside said stepped path.