Endoscopic surgical clip applier

An apparatus for application of surgical clips to body tissue, the apparatus comprising:

• a handle assembly;
• and
• a shaft assembly selectively connectable to the handle assembly and actuatable upon actuation of the handle assembly, the shaft assembly including:
• a pair of jaws movable between a spaced-apart position and an approximated position;
• an elongated spindle having a proximal portion configured to be coupled to an actuator, and a distal portion operably coupled to the pair of jaws to selectively approximate the pair of jaws during distal advancement of the spindle;
• a trip block reciprocally supported on the proximal portion of the spindle and axially movable both with and relative to the spindle;
• a biasing member extending between the proximal portion of the spindle and the trip block;
• and
• a pusher bar having a proximal portion fixedly coupled to the trip block, and a distal portion configured to load a distal-most surgical clip into the pair of jaws during distal movement of the trip block, via distal movement of the spindle, and remain in a distally advanced position during approximation of the pair of jaws;
• and
• wherein both the trip block and the pusher bar are configured to move with the spindle in response to a first distal movement of the spindle to engage the distal portion of the pusher bar with the distal-most surgical clip, and movement of both the trip block and the pusher bar with the spindle is resisted during a second distal movement of the spindle.