Patent ID: 8490852

Claim:
A surgical instrument comprising: a handle having an elongate tubular member extending distally from the handle; an end effector provided on a distal end of the elongate tubular member; a driver mounted for movement relative to the elongate tubular member to operate the end effector; an energy storage mechanism for storing and providing energy to move the driver, the energy storage mechanism having a cylinder, a piston located within the cylinder to define a first chamber of the cylinder and a second chamber of the cylinder, the piston being in sealed relation with an inner wall of the cylinder, a fluid being located within the cylinder, the first and second chambers being connected to allow the fluid to pass between the first and second chambers; an actuation mechanism communicating with the energy storage mechanism to control the release of the energy stored in the energy storage mechanism, wherein the piston is operably associated with the driver to effect movement of the driver in a distal direction; and an energizing handle operatively attached with the piston for storing energy in the energy storage mechanism.