Jaw position impedance limiter for electrosurgical instrument
First Claim
1. An electrosurgical system comprising:
- a radio frequency (RF) current generator;
a handle body;
an end effector comprising;
a first jaw comprising a first energy delivery surface in electrical communication with a first terminal of the RF current generator; and
a second jaw comprising a second energy delivery surface in electrical communication with a second terminal of the RF current generator;
wherein the first jaw and the second jaw form a jaw angle;
a shunt impedance circuit comprising a shunt impedance element having a pre-determined shunt impedance value, wherein the shunt impedance element is reversibly placed electrically in parallel with the first energy delivery surface and the second energy delivery surface when the jaw angle is at least a pre-determined angle, wherein the shunt impedance circuit comprises a spring-loaded contactor; and
an impedance detector in electrical communication with the first energy delivery surface and the second energy delivery surface.
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Accused Products
Abstract
An electrosurgical system may comprise an RF current generator, a handle body, an end effector have a first jaw including a first energizing surface electrically contacting a first terminal of the RF generator, and a second jaw including a second energizing surface electrically contacting a second terminal of the RF current generator, in which the two jaws form a jaw angle. The system may also comprise a shunt impedance circuit including a shunt impedance element having a pre-determined impedance value, in which the shunt impedance element is reversibly placed electrically in parallel with the first and second energizing surfaces when the jaw angle is at least a pre-determined angle. The system may also comprise an impedance detector in electrical communication with the first and second energizing surfaces. The system may be used to measure an impedance between the first and second energizing surfaces by the impedance detector.
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Citations
18 Claims
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1. An electrosurgical system comprising:
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a radio frequency (RF) current generator; a handle body; an end effector comprising; a first jaw comprising a first energy delivery surface in electrical communication with a first terminal of the RF current generator; and a second jaw comprising a second energy delivery surface in electrical communication with a second terminal of the RF current generator; wherein the first jaw and the second jaw form a jaw angle; a shunt impedance circuit comprising a shunt impedance element having a pre-determined shunt impedance value, wherein the shunt impedance element is reversibly placed electrically in parallel with the first energy delivery surface and the second energy delivery surface when the jaw angle is at least a pre-determined angle, wherein the shunt impedance circuit comprises a spring-loaded contactor; and an impedance detector in electrical communication with the first energy delivery surface and the second energy delivery surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An end effector for an electrosurgical device, the end effector comprising:
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a first jaw comprising a first energy delivery surface configured to be in electrical communication with a first terminal of a radio frequency (RF) current generator; a second jaw comprising a second energy delivery surface configured to be in electrical communication with a second terminal of the RF current generator, wherein the first jaw and the second jaw form a jaw angle, and wherein the first jaw, the second jaw, or the first jaw and the second jaw is movable; and a shunt impedance circuit comprising a shunt impedance element having a pre-determined shunt impedance value, wherein the shunt impedance element is reversibly placed electrically in parallel with the first energy delivery surface and the second energy delivery surface when the jaw angle is at least a pre-determined angle; wherein the shunt impedance circuit comprises a spring-loaded contactor in electrical communication with the shunt impedance element. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification