Patent ID: 8172865

Claim:
A biological tissue cutting device comprising: a cutting tip having one or more ports; a cutter within the cutting tip for reciprocating movement across the one or more ports for severing and manipulating tissue drawn into the one or more ports; a drive shaft including at least a first and a second groove defining first and second cut profiles, respectively; a locking mechanism coupled to the drive shaft such that the locking mechanism does not rotate relative to the drive shaft; at least a first and a second drive housing wherein the first drive housing surrounds the first groove and the second drive housing surrounds the second groove, the first and second drive housings further including structure for holding a ball placed within each of the first and second grooves and wherein the cutter is connected to the second drive housing; and wherein when the first drive housing is rotated in a first direction the locking mechanism engages with and prevents rotation of the second drive housing relative to the drive shaft such that the cutter reciprocates according to the first cut profile and when the first drive housing is rotated in an opposite direction the locking mechanism engages with and prevents rotation of the first drive housing relative to the drive shaft such that the cutter reciprocates according to the second cut profile.