Combined flip cutter and drill

摘要

A flip cutter and drill instrument and method of antegrade drilling and retrograde cutting using such an instrument. The flip cutter and drill instrument is provided with a drill which has a multi-blade configuration and which engages an inner tube or inner member of the instrument to articulate between at least a first “straight” position (for example, about parallel to the longitudinal axis of the instrument) when the instrument is in the drilling mode, and at least a second “flip” position (for example, a non-parallel position relative to the longitudinal axis of the instrument) when the instrument is in the cutting mode.

主权项

1. A surgical instrument comprising:
a cannulated shaft extending from a distal end to a proximal end along a longitudinal axis, the distal end having a slot extending diametrically through the cannulated shaft and defining distal opposing shoulders in the cannulated shaft, and the cannulated shaft housing an inner elongated member, such that the inner elongated member is configured for axial sliding along the longitudinal axis through the cannulated shaft; and a cutting member comprising a drill provided with a sharp tip and a plurality of side cutting edges, the cutting member being pivotally coupled to a distal-most end of the inner elongated member by a pivot pin, wherein the cutting member pivots about the pivot pin relative to the inner elongated member and the cannulated shaft, the pivot pin extending through a proximal portion of the cutting member and through the inner elongated member and across the diametrical slot of the cannulated shaft, the cutting member being configured to antegrade drill into bone when disposed in a first position aligned with the longitudinal axis of the cannulated shaft and the inner elongated member, the cutting member being configured to cut into the bone in a retrograde manner when pivoted about the pivot pin and received and secured in the diametrical slot in a second position which is not aligned with the longitudinal axis of the cannulated shaft and the inner elongated member, wherein in the second position the proximal portion of the cutting member is secured in the diametrical slot and is seated on the distal opposing shoulders of the cannulated shaft, the cutting member is lockably controlled for articulation from the first position to the second position; and an actuating mechanism coupled to the proximal end of the cannulated shaft and the inner elongated member for allowing axial movement of the inner elongated member within the cannulated shaft to articulate the cutting member from the first position to the second position, and for locking the cutting member in the second position by prohibiting axial movement of the inner elongated member within the cannulated shaft; wherein the distal end of the cannulated shaft extends beyond the cutting member when the cutting member is locked in the second position.