Spindle assembly with mechanical fuse for surgical instruments

摘要

A spindle assembly of a surgical instrument is provided which includes a body and a cutter pin. The body has at least one wall forming first and second channels therein. The cutter pin is disposed within the second channel and operably coupled to a knife rod extending therethrough and is operatively coupled at its distal end to a knife. When the knife rod is moved between a retracted position and a deployed position, the spindle assembly is moved between a first and a second position along the shaft. The cutter pin is configured to deform and exit the body when the knife is deployed and disposed in a trapped condition and in response to an applied force, thereby decoupling the knife from the spindle assembly.

主权项

1. A surgical instrument, comprising:
a housing; a shaft having a proximal end positioned within the housing and a distal end positioned remote from the housing, the shaft having a longitudinal axis defined between the proximal and distal ends; a pair of jaw members operably coupled to the distal end of the shaft; a movable knife rod at least partially disposed within the shaft; a knife operably coupled to a distal end of the knife rod; an actuator operably coupled to the proximal end of the shaft and moveable relative to the housing between a first position and a second position for moving the jaw members between an open position and a substantially closed position; a trigger extending from the housing and configured to actuate the knife; and a movable spindle assembly having:
a body movably disposed on the proximal end of the shaft and operably coupled to the trigger; anda cutter pin removably coupled to the body and fixed to the knife rod in an axial position along the knife rod such that actuation of the trigger axially moves the body to effect axial movement of the knife rod, wherein upon application of a threshold amount of force on the cutter pin by the body in a proximally-oriented direction, the cutter pin folds such that the cutter pin detaches from the body and the body is movable in a proximal direction relative to the cutter pin and the knife rod.