Patent ID: 7419496
Filing Date: 2008-09-02
Classification: A61B

Abstract:
1. A trocar comprising: a cutting shaft with a cutting surface at a distal end; a hollow obturator defining a longitudinal axis and having an open distal end, the obturator surrounding the cutting shaft and cutting surface; a spring urging the cutting surface to an exposed position; a housing cooperating with the cutting shaft wherein, in a first position, the cutting surface is retracted within the obturator and, upon rotation of the housing in about an axis that is parallel to the longitudinal axis from the first position, the cutting surface moves axially relative to the obturator to a second position wherein the cutting surface is exposed; an obturator longitudinal slot extending from a proximal end of the obturator toward the distal end; a flange provided on the cutting shaft and a pin extending radially outward from the cutting shaft flange, wherein the pin cooperates with the obturator longitudinal slot to secure the cutting shaft from rotational movement relative to the obturator; an obturator flange provided on the obturator spaced from the proximal end such that the longitudinal slot extends from the proximal end to the obturator flange; and a cam slot provided on an inner surface of the housing to receive the pin.