Patent ID: 7549992

Claim:
A surgical instrument for the dissection of bone or other tissue having a motor with a power output, the surgical instrument comprising: a dissection tool having an elongated shaft, a proximal end, and a distal end; a coupling assembly for coupling the power output to the proximal end of the dissection tool, the coupling assembly extending along a longitudinal axis; an attachment tube having a proximal portion movably coupled to the coupling assembly and an internal passage extending from the proximal portion to an opposite distal portion, the proximal portion of the internal passage extending substantially along the longitudinal axis and the distal portion of the internal passage extending at an oblique angle with respect to the longitudinal axis; and a locking assembly movably coupled to the coupling assembly, the locking assembly movable between a locked position wherein the attachment tube is locked to the coupling assembly, a guiding position wherein the attachment tube is moveably coupled to the coupling assembly, and an open position wherein the attachment tube is removable from the coupling assembly, wherein the attachment tube is movable along the longitudinal axis between a first coupled position and a second coupled position with respect to the coupling assembly such that the distal end of the dissection tool extends beyond the distal portion of the attachment tube a first distance in the first coupled position and the distal end of the dissection tool extends beyond the distal portion of the attachment tube a second distance in the second coupled position, wherein the second distance is greater than the first distance.