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Electrode for radiofrequency tissue ablation

An electrode and action technology, which is applied to the electrode field of an electrical operating device, can solve the problems of ineffective expansion of the ablation area and the like

Inactive Publication Date: 2006-05-24
全明基
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when generating RF energy beyond the limit point, the tissue near the electrode is carbonized, so the ablation area is not expanded effectively

Method used

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  • Electrode for radiofrequency tissue ablation
  • Electrode for radiofrequency tissue ablation
  • Electrode for radiofrequency tissue ablation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0043] The test object was cow liver, and the radio frequency generator was a 480 kHz radio frequency generator (Radionics, USA). A 5.85% saline solution was supplied in the electrode at a rate of 80-120 ml / min and injected into living tissue at a rate of 1 ml / cm. By sequentially supplying 30 seconds-1.2A (about 120W), 30 seconds-1.6A (about 160W) and 12~15 seconds-2A (about 200W) output, and keeping the impedance between 50 and 110Ω, 50 ablation and necrosis assays. Ablated and necrotic areas were measured by magnetic resonance imaging (MRI).

[0044] Here, thermocouples are embedded in the electrodes. Measure the temperature of the living tissue near the electrode through the impedance of the thermocouple, and control the RF energy and current applied to the electrode according to the measured temperature, thereby preventing the living tissue from being overheated and carbonized, and can be used in a wider area Ablation and necrosis are performed on the living tissue in t...

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Abstract

The present invention discloses an electrode for an electric operating device, comprising: a hollow electrode in the shape of a hollow tube extending from a closed top end and having an insulating coating on the outer surface except for a predetermined length of the closed top end side; a refrigerant tube , whose diameter is smaller than that of the hollow electrode and inserted into the hollow electrode, the refrigerant tube supplies the refrigerant that cools the living tissue in contact with the closed top end and the hollow electrode into the hollow electrode, and transfers the heat through the gap between the refrigerant tube and the hollow electrode The exchanged refrigerant is discharged outward from the living tissue; at least one first hole is formed on the outer surface of the hollow electrode on which the insulating coating is not formed, and discharges some of the refrigerant supplied through the refrigerant tube from the hollow electrode; and a flow rate The control device is formed on the outer surface of the hollow electrode without an insulating coating, and acts as a discharge resistance to the refrigerant discharged from the first hole to control the flow of the refrigerant. It provides two types of water cooling inside the electrode and discharge of saline solution. The electrode structure of the method.

Description

technical field [0001] The present invention relates to an electrode for an electro-operated device, and more particularly to an electrode for an electro-operated device for ablation and necrosis of living tissue using RF electrical energy. Background technique [0002] In general, a technique of ablating (or coagulating) desired living tissue with RF energy by inserting a long hollow tubular electrode into the living tissue is known. When an electric current is applied to living tissue, the living tissue is heated, thereby ablating the living tissue and blood vessels through complex biochemical processes. The process relies on ablation of cells by thermal transition of cellular proteins above about 60°C. Here, the cells refer to tissues, blood vessels and blood. However, living tissue and blood near the electrodes will be carbonized by excessive ablation. The carbonized living tissue near the electrode acts as an insulator, that is, it becomes an obstacle that hinders th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B18/16A61B18/00A61B18/14
CPCA61B18/1477A61B2018/00023A61B2018/00029A61B2018/00083A61B2218/002A61B18/16
Inventor 全明基
Owner 全明基
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