Electrosurgical instrument and method of use
First Claim
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1. An electrosurgical jaw structure for delivering energy to engaged tissue, the structure comprising:
- first and second openable-closeable jaw members, at least one jaw member defining a first peripheral portion and a second central portion wherein the second portion is recessed relative to the first portion;
at least one jaw carrying a conductive material comprising a positive temperature coefficient material, the a positive temperature coefficient material capable of conducting current to engaged tissue; and
an Rf source operatively coupled to the conductive material.
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Abstract
An electrosurgical medical device and method for creating thermal welds in engaged tissue. In one embodiment, at least one jaw of the instrument defines a tissue engagement plane that carries a recessed central portion. In another embodiment, the controller coupled to the Rf source is adapted to switch from a power control operational mode to a voltage controlled operational mode at a selected transition impedance level.
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Citations
15 Claims
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1. An electrosurgical jaw structure for delivering energy to engaged tissue, the structure comprising:
- first and second openable-closeable jaw members, at least one jaw member defining a first peripheral portion and a second central portion wherein the second portion is recessed relative to the first portion;
at least one jaw carrying a conductive material comprising a positive temperature coefficient material, the a positive temperature coefficient material capable of conducting current to engaged tissue; and
an Rf source operatively coupled to the conductive material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 13)
- first and second openable-closeable jaw members, at least one jaw member defining a first peripheral portion and a second central portion wherein the second portion is recessed relative to the first portion;
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8. An electrosurgical jaw structure for delivering energy to engaged tissue, the structure comprising:
- first and second paired jaw members each defining a respective surface engagement plane for contacting tissue, the paired jaw members moveable between an open and closed position;
the paired jaw members defining a peripheral portion and a central portion;
wherein the paired jaw members in the closed position define an engagement gap between respective engagement planes that has a first dimension in the peripheral portion and a second dimension in the central portion, and wherein said second dimension is greater than said first dimension, wherein a portion of at least of one the jaw members comprises a positive temperature coefficient material, the a positive temperature coefficient material capable of conducting current to engaged tissue. - View Dependent Claims (9, 10, 11, 12, 14, 15)
- first and second paired jaw members each defining a respective surface engagement plane for contacting tissue, the paired jaw members moveable between an open and closed position;
Specification