Mixed gas feeder of target knife and method for controlling cooling capacity output

Abstract

The invention relates to a mixed gas feeder of a target knife and a method for controlling refrigeration capacity output. The feeder comprises two steel cylinders, two gas flow controllers, a mixing chamber, a high-voltage pressure controller, a high-voltage magnetic valve, a low-voltage pressure controller, a low-voltage magnetic valve, a controller, a pre-cooling system and a target knife, wherein different gases with the Joule-Thomson effect are filled in the two steel cylinders; the gases flow out of the steel cylinders, enters the mixing chamber to be fully mixed after being subjected to flow regulation by the flow controller, flows through the pressure controllers and the magnetic valves in sequence, enters the pre-cooling system to be pre-cooled, and flows to a target zone for throttling cooling. According to the invention, the flow of the two steel cylinders can be regulated to be different through the controller so as to realize the situation that two gases are mixed in an arbitrary mixing rate; the throttling cooling property of N2 and Ar is fully utilized, so that the cooling capacity of an input knife head is accurately controlled, different cooling capacity requirements for cryoablation of tumors at different parts are met, the cryoablation effect is guaranteed and effective utilization rate of the cooling capacity of the pre-cooling system is improved at the same time, the gas source is saved, and burdens of a patient are alleviated.

Description

technical field [0001] The invention relates to a mixed gas supply device and a method for controlling cold output of a targeted knife for cryoablation of tumors, which are used to control the cold input into the targeted area after the targeted area of ​​the targeted knife is rapidly reduced to the ablation temperature. quantity. Background technique [0002] In 2010, malignant tumor has become the disease with the highest death rate in the world. If no action is taken, there will be an estimated 26 million new cases and 17 million deaths worldwide by 2030. Because only about 20% of tumor patients can receive surgical resection, minimally invasive tumor treatment technologies such as cryoablation, radiofrequency ablation, microwave, and laser hyperthermia are becoming the forefront of contemporary clinical medicine development, and cryoablation is one of the representative methods. Technology. It mainly uses low-temperature equipment to control the lesion tissue through ...

AI Technical Summary

Problems solved by technology

The liquid nitrogen system targeted knife can be regarded as the first generation targeted knife, which has the following disadvantages: the cooling speed of the knife head is slow, which is not conducive to the killing of tumor cells; the diameter of the targeted knife is large, which is not conducive to minimally invasive treatment; the equipment volume Larger, liquid nitrogen storage requires special equipment, not easy to transport

Therefore, simply supplying pre-cooled nitrogen (N 2 ) or argon (Ar), or there is insufficient cooling capacity, or there are problems such as slow initial cooling, etc., which cannot effectively meet the actual clinical needs, resulting in waste of resources and increasing the economic burden of patients

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