Multiple firing stroke surgical instrument incorporating electroactive polymer anti-backup mechanism
First Claim
1. A surgical instrument, comprising:
- an end effector;
a longitudinally reciprocating firing member distally coupled to the end effector;
a shaft having a distal end attached to the end effector and operatively configured to guide the firing member;
a handle attached to a proximal end of the shaft operatively configured to distally advance the firing member in a sequence of strokes; and
an electrical actuator physically grounded to the handle and responsive to an electrical signal to move between a non-binding and a binding position with the firing member to prevent longitudinal movement thereof,wherein the electrical actuator comprises an electroactive polymer actuator;
wherein the shaft further comprises a frame ground longitudinally positioned by the handle, the electroactive polymer actuator comprising an electroactive polymer sleeve at least partially encompassing the firing member and attached to the frame ground.
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Accused Products
Abstract
A surgical stapling and severing instrument particularly suited to endoscopic procedures incorporates a handle that produces separate closing and firing motions to actuate an end effector. In particular, the handle produces multiple firing strokes in order to reduce the required amount of force required to fire (i.e., staple and sever) the end effector. A firing member reciprocates within an elongate shaft to the end effector to transfer this firing motion. A retraction spring retracts the firing member after full firing. Between firing strokes as the firing trigger is released, an anti-backup mechanism activates an electrical actuator (e.g., elecroactive polymer actuator) that is physically grounded to the handle to bind the firing member preventing inadvertent retraction.
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Citations
20 Claims
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1. A surgical instrument, comprising:
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an end effector; a longitudinally reciprocating firing member distally coupled to the end effector; a shaft having a distal end attached to the end effector and operatively configured to guide the firing member; a handle attached to a proximal end of the shaft operatively configured to distally advance the firing member in a sequence of strokes; and an electrical actuator physically grounded to the handle and responsive to an electrical signal to move between a non-binding and a binding position with the firing member to prevent longitudinal movement thereof,wherein the electrical actuator comprises an electroactive polymer actuator; wherein the shaft further comprises a frame ground longitudinally positioned by the handle, the electroactive polymer actuator comprising an electroactive polymer sleeve at least partially encompassing the firing member and attached to the frame ground. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A surgical instrument, comprising:
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an end effector; a longitudinally reciprocating firing member distally coupled to the end effector; a shaft having a distal end attached to the end effector and operatively configured to guide the firing member; a handle attached to a proximal end of the shaft operatively configured to distally advance the firing member in a sequence of strokes; and an electrical actuator physically grounded to the handle and responsive to an electrical signal to move between a non-binding and a binding position with the firing member to prevent longitudinal movement thereof, wherein the electrical actuator further comprises; a locking plate of the electrical actuator having a through hole encompassing the firing member, the locking plate through hole sized for the locking plate to be in nonbinding contact with the firing member when the locking plate is in an unlocked state perpendicular to the firing member, and for the locking plate to be in binding contact with the firing member when the locking plate is in a locked state when tipped at an angle from perpendicular, the electrical actuator positioned to move the locking plate from a selected state to the other state of a group consisting of the unlocked state and the locked state.
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Specification