BACKGROUND OF THE INVENTION

Field of the Invention

The present application relates generally to surgical occlusion instruments and, more particularly, to surgical staplers.

Description of the Related Art

Surgical staplers are used to approximate or clamp tissue and to staple the clamped tissue together. As such, surgical staplers have mechanisms to ensure that tissue is properly positioned and captured and to drive staples through the tissue. As a result, this has produced, for example, multiple triggers and handles in conjunction with complex mechanisms to provide proper stapling of the clamped tissue. With these complex mechanisms, surgical staplers can have increased manufacturing burdens, as well as potential sources for device failure and confusion for the user. Thus, reliable stapling of clamped tissue without complex mechanisms is desired.

SUMMARY OF THE INVENTION

In certain embodiments, a surgical stapler is provided herein. The surgical stapler comprises an elongate shaft, a jaw assembly, and a handle assembly. The elongate shaft has a proximal end and a distal end. The elongate shaft defines a longitudinal axis between the proximal end and the distal end. The jaw assembly is positioned at the distal end of the elongate shaft. The jaw assembly comprises a first jaw, a second jaw, and a plurality of staples. The jaw assembly is selectively positionable in one of a closed configuration, an open configuration, and a firing configuration. The handle assembly is positioned at the proximal end of the elongate shaft. The handle assembly comprises a stationary handle, a movable trigger pivotably coupled to the stationary handle, and an actuation shaft. The actuation shaft is longitudinally slidable within the handle assembly with respect to the longitudinal axis of the actuation shaft and rotatable within the handle assembly with respect to the longitudinal axis. The actuation shaft is operably coupled to the jaw assembly and the actuation shaft is longitudinally slidable in a first direction from a first position corresponding to the open configuration of the jaw assembly to a second position corresponding to the closed configuration of the jaw assembly and from the second position to a third position corresponding to the firing configuration. The actuation shaft is operably coupled to the movable trigger. The actuation shaft is rotatable between a first orientation in which movement of the trigger moves the actuation shaft between the second position and the third position and a second orientation in which movement of the trigger moves the actuation shaft from the third position to the first position.

In certain embodiments, a handle assembly for a surgical stapler is provided. The surgical stapler comprises an elongate shaft having a proximal end and a distal end, the elongate shaft defining a longitudinal axis between the proximal end and the distal end, and a jaw assembly disposed at the distal end of the elongate shaft. The handle assembly comprises a housing, a stationary handle disposed on the housing, a movable handle, an actuation mechanism, and a coupler. The movable handle is pivotably coupled to the housing and pivotable between an open position spaced apart from the stationary handle and a closed position adjacent the stationary handle. The actuation mechanism comprises an advancing driver, a reversing driver, and an actuation shaft. The advancing driver is operably coupled to the movable handle and translatable distally with respect to the longitudinal axis responsive to movement of the movable handle from the open position to the closed position. The reversing driver is operably coupled to the movable handle and translatable proximally with respect to the longitudinal axis responsive to movement of the movable handle from the open position to the closed position. The actuation shaft extends along the longitudinal axis. The actuation shaft is rotatably coupled to the housing with respect to the longitudinal axis. The actuation shaft comprises an advancing surface and a reversing surface. The advancing surface extends longitudinally along the actuation shaft. The reversing surface extends longitudinally along the actuation shaft. The reversing surface is angularly offset from the advancing surface. The actuation shaft is rotatable between a first orientation in which the advancing driver engages the advancing surface and a second orientation in which the reversing driver engages the reversing surface. The coupler is adapted to engage the elongate shaft of the surgical stapler.

In certain embodiments, a handle assembly for a surgical stapler is provided. The handle assembly comprises a housing, a trigger pivotably coupled to the housing, and an actuation mechanism. The actuation mechanism comprises a forward driver, a reverse driver, an actuation shaft, and a selector. The forward driver is operably coupled to the trigger. The reverse driver is operably coupled to the trigger. The actuation shaft has a longitudinal axis. The actuation shaft is rotatably coupled to the housing relative to the longitudinal axis. The actuation shaft comprises a forward interface surface and a reverse interface surface angularly offset from the forward interface surface. The actuation shaft is rotatable between a first orientation in which the forward interface surface engages the forward driver to move the actuation shaft in a first direction responsive to pivotal movement of the trigger and a second orientation in which the reverse interface surface engages the reverse driver to move the actuation shaft in a second direction opposite the first direction responsive to pivotal movement of the trigger. The selector is operably coupled to the actuation shaft to selectively rotate the actuation shaft between the first orientation and the second orientation.

