Gas throttling cooling type radio frequency ablation electrode

Abstract

The invention discloses a gas throttling cooling radiofrequency ablation electrode; the front end of an electrode needle is coated with insulation materials and engraved with a scale, the needle tip is exposed, the invention is provided with a built-in miniature spiral finned tube heat exchanger, the front end of the heat exchanger is embedded with a miniature throttling tube, the back end is connected with a high-pressure gas slim tube; the high-pressure gas passes the high-pressure gas tube, is carried out the throttling refrigeration at the top part of the electrode needle, passes the heat exchanger and is exhausted from an exhaust cavity which is arranged between a thermal insulation sleeve in the needle and the high-pressure gas tube. A radiofrequency wire and a thermocouple are penetrated out from the middle of the miniature spiral finned tube heat exchanger and are respectively arranged at the top part in the electrode needle. The invention applies the gas throttling cooling to control and expand the scope of ablation fast and high efficiently, and the invention can be widely applied in the radiofrequency ablation of the tumors.

Description

technical field [0001] The invention relates to a gas throttling cooling type radio frequency ablation electrode, which is a radio frequency ablation electrode which uses gas throttling cooling to quickly control and expand the ablation range. Background technique [0002] Radiofrequency ablation of tumors involves inserting electrode needles into the diseased tissue, applying alternating high-frequency electromagnetic waves to alternately change the movement direction of ions in the tumor tissue, and converting ion kinetic energy into heat energy to increase the temperature of the diseased tissue, thereby achieving the purpose of treatment. The direct thermal ablation effect is related to the temperature to which the tissue is exposed, which is determined by the applied energy, the rate of heating, and the thermal sensitivity of the tissue. Generally, the heating temperature is 41°C-45°C and the time is 30-60min, which can cause irreversible cell damage. The inactivation o...

AI Technical Summary

Problems solved by technology

The multiple curved sub-needles of the above-mentioned multi-bullet ablation electrode can be deployed simultaneously to form a spherical shape, thereby forming a spherical coagulation necrosis area. It greatly increases the potential risk of damaging adjacent important tissues, and the operation is more complicated, and it is difficult to insert it into the target tissue correctly; in addition, the ablation area of ​​the multi-bullet ablation electrode is irregular, which is easy to cause bleeding and infection symptoms

However, due to the limited size of the water inlet and outlet pipes, the flow rate of the cooling solution is slow and the flow rate is not large. When the temperature of the electrode needle is high, the flow resistance is large, resulting in low heat transfer efficiency and poor cooling effect.

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