| 摘要 |
Cryosurgical apparatus, for example, a probe (10) is described which produces cooling by vaporization of a liquid cryogen, such as a liquid nitrogen. Means (40) are located adjacent to the cooling region of the probe to define a tortuous flow path for the cryogen to, through, or from, the cooling region, in order to improve the thermal efficiency of the probe. In one form, the means (40) consists of a wire wound into a spring shape to define a helical path between concentric conduits (22, 24) defining inlet and exhaust passages (26 and 28) for the cryogenic fluid.
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