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冷冻治疗器在用于人体器官的深部病灶,尤以在窄小而深藏的术野施术时,要求冷冻头的非治疗部份要有良好的隔冷性能,以免冻伤正常组织。目前较有效的隔冷多是采用真空腔隔冷,即在冷冻头非治疗部位的外周做一密封的真空腔,如同热水瓶胆的真空隔热层一样。为隔冷效果好则真空腔需较大,真空度需保持在10~(-4)mmHg 以上。故工艺精密复杂、造价较高,且难做得很细又易损坏。据1986年第三届全国冷冻及医疗器械学术会议提供的资料表明,有些用电热或保温
Cryosurgery in the deep lesions used in human organs, especially in the narrow and deep surgical field surgery, the frozen head requires non-treated parts have good cooling performance, so as to prevent frostbite normal tissue. At present, more effective cooling is the use of vacuum chamber cooling, that is, in the frozen head non-treatment part of the outer periphery of a sealed vacuum chamber, the same as the thermos flask vacuum insulation. For the cooling effect is good vacuum chamber to be larger, the degree of vacuum to be maintained at 10 ~ (-4) mmHg above. Therefore, the process is complicated and complicated, the cost is high, and it is difficult to make it thin and easily damaged. According to the information provided by the Third National Conference on Cryosurgery and Medical Devices in 1986, some people use electric or thermal insulation