Patent ID: 7883476

Claim:
A medical device for attaching to a handpiece defined by a distal end and having an inner cutting element including an inner cannula that has an open distal end, said medical device comprising: an outer cannula having a proximal end and a distal end, said outer cannula being sized to accept the inner cutting element including the inner cannula; and a cannula hub having a bore therethrough, said cannula hub being fixedly attached to said proximal end of said outer cannula and supporting said outer cannula, wherein said cannula hub further comprises a cooperating fitting member that is configured for selective positive engagement with a mating fitting disposed on the distal end of the handpiece so as to selectively and removably secure said cannula hub to said handpiece, the cooperating fitting member including a flange having a plurality of wings separated by a plurality of recessed regions, at least one of the wings having a larger circumferential length than at least one of the remaining wings; wherein an instrument is selectively insertable through said bore and into said outer cannula.