制冷学报2024，Vol.45Issue(2)：160-166,7.DOI:10.3969/j.issn.0253-4339.2024.02.160
冷冻活检针中CO2节流降温特性的实验研究
Experimental Study on Throttling and Cooling Characteristics of CO2 in Cryoprobes
摘要
Abstract
By comparing the cooling characteristics of four types of cryoprobes under different inlet pressures,the effects of the inlet pressure,J-T slot inner diameter,and backflow channel size on the cooling of cryoprobes are analyzed,and the size of ice hockey balls formed in gelatin are tested.The results show that the temperatures of 1.8-0.42 mm,1.8-0.30 mm,1.8-0.12 mm,and 1.1 mm cryoprobes are the fastest under the inlet pressure of 4.5 MPa,4.0 MPa,5.5 MPa,and 5.5 MPa,respectively.When the pressure is low,the cooling rate is positively correlated with the inlet pressure.When the inlet pressure is greater than the optimal pressure,the ice blockage increases with increasing pressure.Among the cryoprobes,a smaller inner diameter of the J-T slot improves the cooling rate of the cryoprobes and lowers the temperature of the tip,and a larger backflow channel can reduce ice blockage in the pipe and improve the cooling rate;1.8-0.42,1.8-0.30,1.8-0.12 mm,and 1.1 mm cryoprobes have the largest ice hockey ball diameters under air supply pressures of 4.5,4.5,6.0,and 6.0 MPa,respectively.When the inner diameter of the J-T slot decreases,its optimal air supply pressure increases.关键词
冷冻活检/J-T效应/降温速率/活检针Key words
transbronchial lung cryobiopsy/Joule-Thomson effect/cooling rate/cryoprobe分类
通用工业技术引用本文复制引用
金斌辉,刘宝林,杨迟,徐彬凯..冷冻活检针中CO2节流降温特性的实验研究[J].制冷学报,2024,45(2):160-166,7.基金项目
本文受上海市科委项目(20S31903100)资助.(The pro-ject was sponsored by the Shanghai Municipal Science and Tech-nology Commission Project(No.20S31903100).) （20S31903100）
