Patent ID: 6530922
Filing Date: 2003-03-11
Classification: A61B

Abstract:
A cluster electrode instrument for use with a high frequency generator to induce coherent high frequency heat ablation volumes within targeted tissue of a patient, which comprises:a hub; and at least three electrodes each including: a substantially rigid elongated shaft extending from the hub and terminating in a sealed distal end section having an exposed conductive tip portion configured to be inserted into the targeted tissue and adapted at a proximal end section to be coupled to a high frequency generator to simultaneously apply an equal output voltage to each of the exposed conductive tip portions; wherein the conductive tip portions of the at least three electrodes are arrayed relative to each other in a predetermined non-linear geometric spatial relationship relative to a longitudinal axis of the instrument such that upon application of an output voltage to the conductive tip portions, a coherent ablation isotherm is generated which encloses a desired target volume of the tissue to induce a large heat ablation volume; and a closed-loop fluid communication channel pathway which includes an inflow opening adapted for connection to a coolant fluid supply, a channel portion in fluid communication with the inflow opening, which extends distally inside the conductive tip portion to carry coolant to the inside of the conductive tip portion and further extends proximally back to an outlet opening adapted to carry coolant away from the conductive tip portion.