Cryoablation catheter with heat insulation capsule

Abstract

The invention relates to a cryoablation catheter with a heat insulation capsule. The cryoablation catheter comprises a catheter body and a freezing unit, the catheter body comprises a cold source air inlet cavity, a cold source air return cavity and a filling cavity, the cold source air inlet cavity axially extends along the catheter body, the freezing unit is arranged at a far end of the catheter body and comprises a first capsule and the heat insulation capsule, the first capsule is communicated with the cold source air inlet cavity and the cold source air return cavity, and the heat insulation capsule is communicated with the filling cavity. When the first capsule expands, a heat insulation medium is placed into the heat insulation capsule by the filling cavity, an area occupied by the heat insulation capsule is an energy transmission isolation area, and energy transmission of the freezing unit to corresponding space of the heat insulation area is stopped. A freezing energy release area can be effectively limited the cryoablation catheter, so that complication probability is reduced, and the cryoablation catheter is wide in application.

Description

technical field [0001] The invention belongs to the field of cryoablation medical equipment, and in particular relates to a cryoablation catheter with a thermal insulation capsule. Background technique [0002] Cryoablation destroys cells by forming ice balls inside and outside cells through low temperature. During cryoablation, the cryoprobe is placed on the surface of the tissue, and the low temperature is induced by refrigeration, so that ice balls are formed inside and outside the cells around the probe. As the temperature drops, the cells inside the puck are irreversibly damaged. The cryoablation injury process can be divided into three stages: (1) freezing / rewarming period; (2) hemorrhage and inflammation period; (3) fibrosis period. [0003] Cryoablation is a useful treatment modality in a wide range of catheter-based interventional procedures. For example, cryoablation can be used to ablate the vestibule of the pulmonary vein, resulting in electrical isolation of ...

AI Technical Summary

Problems solved by technology

[0005] Chinese patent CN201710096224.0 discloses a heat preservation device for protecting the esophagus during cryoablation of the pulmonary vein with a cryoballoon catheter. The balloon is equipped with a thermocouple of the balloon wall, a thermocouple in the balloon, a thermal cycle heat preservation device, and a thermocouple of the balloon wall and the thermocouple in the balloon are respectively attached to the inner and outer walls of the balloon to realize real-time temperature measurement. The thermal cycle heat preservation device is connected to the heat preservation module, the temperature control module is connected to the thermocouple of the balloon wall, and the thermocouple in the balloon and the heat preservation module are used to control And the feedback balloon temperature, intelligently matching and controlling the cold and heat of the thermal cycle heat preservation device, keeping the temperature of the esophagus near the pulmonary vein ablation area at 20-30°C; The thermal insulation balloon is used at the same time in the pulmonary vein to protect the esophagus adjacent to the pulmonary vein cryoablation area, prevent the esophagus from serious damage such as esophageal fistula caused by cryoablation, eliminate the limitation of CBA cryoablation of pulmonary vein in the treatment of atrial fibrillation, and facilitate the popularization and promotion of CBA catheter ablation of pulmonary vein; This heat preservation device adds a lot of parts and has a complex structure, which is only suitable for the treatment of specific target tissues, and the cost is relatively high

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