Patent ID: 6129731
Filing Date: 2000-10-10
Classification: A61B

Abstract:
A surgical instrument for cutting-out a cranial disc from the skull cap, comprising:a cylindrical trepanning cutter that widens toward a free end thereof into the form of a cylindrical sleeve provided with teeth on its frontal edge, which teeth cut in both peripheral directions;a driving means which drives the trepanning cutter with a periodically altering direction of rotation through an angle of rotation of substantially less than 360.degree., said angle being at least large enough for displacing the teeth by one tooth spacing along the frontal edge; anda support means associated with the trepanning cutter, which support means is displaceable along the rotational axis of the trepanning cutter between a starting position, in which the support means projects beyond the frontal edge, and an end position in which the support means liberates the frontal edge and a section of the trepanning cutter abutting thereon.