自制气体节流冷却射频针性能初探  

A Preliminary Performance Test on the Self-made Gas J-T Cooling Radiofrequency Probe

作　　者：赵庆孝[1] 常兆华 王玉凯[1] 杨鹏飞[3] 

机构地区：[1]上海理工大学,上海200093 [2]上海导向医疗系统有限公司,上海201318 [3]国家食品药品监督管理局医疗器械技术审评中心,北京100044

出　　处：《制冷学报》2011年第3期74-78,共5页Journal of Refrigeration

基　　金：2009年上海市联盟计划-难题招标专项基金资助(09LM14)~~

摘　　要：为测试自制气冷射频针的性能,验证气冷射频技术的可行性及有效性,设计了8种实验工况,实验过程中实时记录距射频针0.5cm、1.0cm、1.5cm处的温度值及消融时间,确定氮气压力、射频功率、冷却方式对消融效果的影响。实验结果表明:气冷射频针能显著延长射频消融时间,提高射频针外围的温度,温度提高幅度、消融时间均与氮气压力正相关;同样工况下,间断冷却比先冷时各点温度稍高,消融时间稍长,但并无显著性差异;30W功率时的各点温度均显著高于对应的45W功率时的温度,常温氮气节流后产生的冷量不足以有效延长45W以上功率时的消融时间。Eight types of experimental conditions were designed to test the performance of the self-made gas J-T cooling radiofrequency probe and evaluate its feasibility and efficacy.The temperatures which were 0.5cm,1.0cm,1.5cm away from the wall of RF probe and the ablation time were recorded in real time to evaluate the effects of nitrogen pressure,RF power and cooling mode on the results of RFA.The results indicated that the gas J-T cooling RF probe could significantly prolong the ablation time and create the higher temperatures,and two of them were both in directive correlation with nitrogen pressure.In comparison with simultaneous cooling,intermittent cooling could create a little higher temperature and had a little longer application time,but the difference was not significant.Temperatures around the probe with 30W power input were significantly higher than the corresponding temperatures with 45W power input,which indicated that the cooling power created by nitrogen throttling at room temperature was too small to efficaciously prolong the ablation time when the power input was over 45W.

关 键 词：热工学 气体节流冷却 射频针 温度 消融时间 

分 类 号：TB69[一般工业技术—制冷工程]