Apparatus for performing an electrosurgical procedure
An endoscopic forceps is provided and includes a housing having a shaft that extends therefrom. An end effector assembly is operatively connected to a distal end of the shaft and includes a pair of pivotably coupled first and second jaw members. One of the jaw members is movable relative to the other jaw member. A drive mechanism includes a driving structure in operative communication with a cam slot operably disposed on one of the first and second jaw members. The driving structure includes a detent.
1. An endoscopic forceps, comprising:
a housing having a shaft that extends therefrom and defines a longitudinal axis therethrough;
an end effector assembly operatively connected to a distal end of the shaft and including a pair of first and second jaw members pivotably coupled to one another, at least one of the first and second jaw members movable relative to the other jaw member from an open position, wherein the first and second jaw members are disposed in spaced relation relative to one another, to a clamping position, wherein the first and second jaw members cooperate to grasp tissue therebetween; and
a drive mechanism including a driving structure having at least one detent supported thereon, the driving structure including a distal end with a distal tip in operative communication with at least one cam slot operably defined within the at least one movable jaw member, the distal end disposed distally relative to the at least one detent and proximally relative to the distal tip,
wherein the distal end of the driving structure is substantially resilient and functions as a cantilever spring configured to flex away from the longitudinal axis when the distal tip is positioned at a proximal end of the cam slot and tissue is positioned between the first and second jaw members, wherein the distal end of the driving structure translates within the at least one cam slot, and
wherein the at least one cam slot includes a generally straight configuration having a proximal end that is substantially aligned with a pivot pin that pivotably couples the first and second jaw members, and a distal end that is offset from the proximal end and above the pivot pin.
2. An endoscopic forceps according to claim 1 , wherein a distal end of at least one stop member disposed within the shaft contacts a proximal end of the at least one detent when the driving structure is moved proximally.
3. An endoscopic forceps according to claim 1 , wherein a camming structure is operably coupled to the distal tip of the driving structure and operably disposed within the at least one cam slot.
4. An endoscopic forceps according to claim 1 , wherein at least one stop member is operably disposed adjacent a distal end of the shaft and configured to contact the at least one detent when the driving structure is moved proximally such that contact between the at least one stop member and the at least one detent corresponds to the distal tip being positioned at a proximal end of the cam slot causing the at least one movable jaw member to move from the open position to the clamping position.
5. An endoscopic forceps according to claim 4 , wherein when the distal tip of the driving structure is disposed at the proximal end of the cam slot and tissue is positioned between the first and second jaw members, a closure force ranging from about 3 kg/cm 2 to about 16 kg/cm 2 is generated between the first and second jaw members.
6. An endoscopic forceps according to claim 1 , wherein the driving structure is selected from the group consisting of a wire, rod, cable and band.
7. An endoscopic forceps according to claim 1 , further comprising a movable handle that is operably associated with the endoscopic forceps and configured to actuate the driving mechanism when the movable handle is moved proximally such that the at least one movable jaw member moves from the open position to the clamping position.