多探针冷冻外科冻结过程分析

Analysis of the Freeze Processes in Cryosurgery with Multiple Probes

用有限元方法对建立在焓法基础上的多探针冷冻条件下组织冻结过程进行理论分析 .计算结果与文献中实验测量结果符合较好 ,证明了方法的可行性 .对单探针、双探针和三探针组合的组织冻结过程进一步比较分析表明 ,在相同的降温条件下 ,单探针外冰球直径为 1 2 mm时 ,双探针和三探针分别达到 2 0 mm和 2 1 .5 mm.组织内达到的最低温度分别为 - 1 2°C(单探针 ) ,- 49°C(双探针 ) ,- 88°C(三探针 ) .但在多探针平行放置时 ,冰球的上下端中心会出现温度较高的等温线凹穴 ;y方向温度梯度增大 ,而探针间

The numerical model based on enthalpy method and solved by finite element scheme around multiple probes was presented and the result is consistent with the experimental result. The calculation result demonstrates that with the same force temperature procedure, when the diameter of the ice ball is 12 mm, it has got 20 mm and 21.5 mm around two and three probes respectively. And the lowest temperatures in the tissue are -12°C, -49°C, -88°C for single, double and three probes respectively. As the probes are parallel to each other, the gradient on y direction is more acute for more probes but the gradient on x direction is much more lower outside multiple probes.