Electrosurgical instrument
First Claim
1. An electrosurgical instrument for applying energy to a body structure, the instrument comprising first and second jaws carrying respective first and second energy-delivery elements coupled to an RF source by a first circuit component, the first energy-delivery element coupled to a resistive body in the first jaw, wherein the first energy-delivery element and the resistive body are coupled the RF source by a second circuit component, and wherein the second energy-delivery element is a positive temperature coefficient (PTC) composition and the resistive body is a PTC composition and the second energy-delivery element PTC composition and the resistive body PTC composition define different temperature-impedance curves.
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Accused Products
Abstract
An embodiment of the invention includes an electrosurgical jaw structure that carries cooperating PTC bodies in both series and parallel circuit components for controlled RF energy application to engaged tissue to effectively weld tissue.
466 Citations
17 Claims
- 1. An electrosurgical instrument for applying energy to a body structure, the instrument comprising first and second jaws carrying respective first and second energy-delivery elements coupled to an RF source by a first circuit component, the first energy-delivery element coupled to a resistive body in the first jaw, wherein the first energy-delivery element and the resistive body are coupled the RF source by a second circuit component, and wherein the second energy-delivery element is a positive temperature coefficient (PTC) composition and the resistive body is a PTC composition and the second energy-delivery element PTC composition and the resistive body PTC composition define different temperature-impedance curves.
- 6. An electrosurgical instrument comprising first and second jaws coupled to an RF source and actuatable between a first open position and a second closed position, the jaws in a closed position define an engagement gap, wherein the first jaw carries a first energy-delivery element and the second jaw carries a second energy-delivery element of PTC composition, the first energy-delivery element coupled to a resistive body PTC composition in the first jaw, and the second energy-delivery element PTC composition and the resistive body PTC composition define different temperature-impedance curves.
Specification