发明名称 |
Method and apparatus for measuring the heat transfer coefficient during cryogen spray cooling of tissue |
摘要 |
The invention is a technique for dynamic measurements of the heat transfer coefficient to the outer layer of the skin surface using a high thermal conductivity metal in an insulating block as the standardized target. The coefficient is dependent on the specific design of the cryogen valve and nozzle, and values up to 11 500 W/m<2>K values were measured for a 100 ms long spurts. The values for longer spurts are dependent on air humidity, as ice/snow formation then tends to form a thermally insulating layer. The average value of the heat transfer coefficient for a 200 ms long spurt was determined to 8000 W/m<2>K for conditions of normal room humidity and temperature. The technique enables an improved prediction of the temperature profile and cooling efficiency during therapy, and may thereby contribute to an improved therapeutic outcome.
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申请公布号 |
US6669688(B2) |
申请公布日期 |
2003.12.30 |
申请号 |
US20010768641 |
申请日期 |
2001.01.23 |
申请人 |
THE REGENTS OF THE UNIVERSITY OF CALIFORNIA |
发明人 |
SVAASAND LARS O.;NELSON J. STUART;BERNS MICHAEL W.;KIMEL SOL |
分类号 |
A61B17/00;A61B18/00;A61B18/02;A61B18/20;(IPC1-7):A61B18/18 |
主分类号 |
A61B17/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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