Patent ID: 8652028

Claim:
A medical device, comprising: an endoscope including an endoscope handle and a tubular member, the tubular member having a length, an inner surface, a first lumen defined along at least a portion of the length, and a second lumen defined along at least a portion of the length; a shaft slidably disposed in the first lumen, the shaft having a proximal end, a distal end, a length, and an outer surface; wherein the shaft has a substantially circular cross-sectional shape; a non-expandable sleeve disposed along and fixed to the outer surface of the shaft; an optical scope disposed in second lumen; wherein the sleeve has a transverse cross-sectional shape that is polygonal along a portion of its length; wherein the tubular member has an inner diameter and the polygonal shape of the sleeve defines a maximum outer diameter of the sleeve that is substantially equal to the inner diameter of the tubular member; and an end effector disposed adjacent the distal end of the shaft, the end effector including a biopsy tool.