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US 2019/0159775 A1Published application
Surgical stapling instrument and associated trigger mechanisms
AssigneeCovidien LP
InventorsJeevan Shankar Setty Maddur, Sabastian Koduthully George, Syed Sarfraz Ahamed, Anant Tiwari
Life of this patent
Estimating the term…
Abstract
A trigger mechanism for a surgical instrument, particularly, a surgical stapling instrument provides significant mechanical advantages by increasing the length of the firing stroke of the surgical instrument while reducing the degree of movement of the trigger associated with the trigger mechanism. The trigger mechanism also reduces the forces required to actuate the trigger thereby enhancing usability and minimizing operator fatigue.
Claims8
A surgical instrument, comprising:
- a handle including a handle frame defining a longitudinal handle axis;
- an elongate member extending from the handle frame;
- an end effector coupled to the elongate member;
- a thrust member extending through the elongate member and coupled to the end effector, the thrust member configured for longitudinal movement to control operation of the end effector;
- and
- a trigger mechanism including:
- a trigger pivotally mounted to the handle frame and configured for movement between an initial position and an actuated position;
- and
- a thrust link coupled to the trigger and operatively engageable with the thrust member, the thrust link extending relative to the longitudinal axis at a fixed link angle, the thrust link longitudinally advanceable while maintaining the fixed link angle upon movement of the trigger from the initial position to the actuated position to cause corresponding advancing movement of the thrust member and operation of the end effector.
6 more elements
A surgical instrument, comprising:
- a handle including a handle frame defining a longitudinal handle axis;
- an elongate member extending from the handle frame;
- an end effector coupled to the elongate member;
- a thrust member extending through the elongate member and coupled to the end effector, the thrust member configured for longitudinal movement to control operation of the end effector;
- and
- a trigger mechanism including:
- a trigger pivotally mounted to the handle frame and configured for movement between an initial position and an actuated position;
- and
- a thrust link coupled to the trigger and operatively engageable with the thrust member, the thrust link defining an elongated slot for reception of a thrust link pin mounted to the trigger, the thrust link configured to pivot about the thrust link pin and to longitudinally advance upon movement of the trigger from the initial position to the actuated position to cause corresponding advancing movement of the thrust member to operate the end effector.
6 more elements
A surgical instrument, comprising:
- a handle including a handle frame defining a longitudinal handle axis and having an internal guide member with an internal guide surface;
- an elongate member extending from the handle frame;
- an end effector coupled to the elongate member;
- a thrust member extending through the elongate member and coupled to the end effector, the thrust member configured for longitudinal movement to control operation of the end effector, the thrust member defining a thrust bar arm;
- and
- a trigger mechanism, including:
- a trigger pivotally mounted to the handle frame and configured for movement between an initial position and an actuated position;
- and
- a thrust link coupled to the trigger, the thrust link having a forward drive cam engageable with the thrust bar arm of the thrust member and a guide cam engageable with the internal guide surface of the guide member of the handle frame, the thrust link configured to pivot upon movement of the trigger from the initial position to the actuated position through traversing movement of the guide cam along the internal guide surface of the guide member to cause corresponding traversing movement of the forward drive cam of the thrust link along the thrust bar arm of the thrust member to cause advancing movement of the thrust member through at least a first stage of longitudinal movement to operate the end effector.
6 more elements
Dependencies are inferred from the claim text.