Patent ID: 8048078
Filing Date: 2011-11-01
Classification: A61B,B23B,Y10T

Abstract:
1. A tool for making drill-holes in bones or removing cylindrical drill-hole cores from bones of the human body, including a tubular tool body which can be driven in rotation about its longitudinal axis, which tool body can be connected in a rotationally fixed and axially non-displaceable manner to a tool holder of the drive device which tightly surrounds it, and is provided with cutting or grinding elements at its outer end, said tool characterized in that the tool body has at its inner end a cutout which extends as far as an end face of the tool body; a protrusion which protrudes radially inward from an inner wall surface of the tool holder and is received in the cutout when the tool body is inserted into the tool holder as far as a stop; an outwardly projecting tongue integrally formed with the wall of the tool body and points towards the outer end of the tool body is provided at an axial distance from the cutout; the tongue, when the tool body is pushed into the tool holder and immediately before the tool body reaches the stop, enters an opening in the wall of the tool holder, in a manner such as to prevent any axial displacements of the tool body in the tool holder, from which opening it can be bent out only with permanent deformation of the tongue in order to remove the tool body from the tool holder; and the tongue has a reduced cross-sectional area in the region of its tongue root due to the provision of a hole through the tongue and said permanent deformation occurs at said reduced cross-sectional area.