Patent ID: 8197483

Claim:
Surgical bone punch, comprising: a stationary shaft joined to a handgrip, a slide shaft mounted for longitudinal displacement on the stationary shaft, and a motorized drive in the handgrip for displacement of the slide shaft from a proximal inoperative position to a distal operative position with a preset forward displacement force, wherein: the slide shaft carries a stop, which, during displacement of the slide shaft to the operative position, strikes an elastic spring element, which is supported on the stationary shaft, and, during displacement of the slide shaft, counteracts the forward displacement force of the drive, the stop does not contact the elastic spring element with a compressive force in a first portion of a path of displacement; and the stop of the slide shaft, the elastic spring element and a support of the elastic spring element on the stationary shaft are so arranged and dimensioned that the elastic spring element, during the displacement of the slide shaft from the inoperative position to the operative position, becomes operative and counteracts the forward displacement force only during displacement of the slide shaft along a second portion of the path of the displacement.