发明名称 |
MIXED GAS REFRIGERATION METHOD |
摘要 |
A miniatured mixed gas refrigeration system and method of operation are disclosed, having a coaxial catheter (18) with an inner high pressure supply lumen and an outer low pressure return lumen. An optimum gas mixture is formulated from a group of component fluids, according to calculated thermodynamic properties of a group of candidate flu id mixtures. The gas mixture is pressurized by a compressor (12) to a pressure less than 420 psia, for safety reasons. The distal portio n (20) of the outer lumen contains a micro-miniature heat exchanger constructed of laminated plates or sheets. The plates or sheets establish hi gh pressure and low pressure passageways, with high surface area, having a tortuous path for the gas flow to maximize heat exchange. The high pressure outlet of the heat exchanger is connected to a Joule-Thomson expansion element where the high pressure gas is expanded isenthalpically to a lower temperature at least as low as 183K. This low temperature gas cools a heat transfer element mounted in the outer wall of the catheter, to cool an external object. Return gas flows back through the heat exchanger to pre-cool the incoming high pressure gas mixture.
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申请公布号 |
CA2263382(C) |
申请公布日期 |
2007.04.03 |
申请号 |
CA19972263382 |
申请日期 |
1997.08.06 |
申请人 |
CRYOGEN, INC.;SECRETARY OF COMMERCE OF THE UNITED STATES |
发明人 |
RADEBAUGH, RAY;HUBER, MARCIA L.;MARQUARDT, ERIC D.;DOBAK, JOHN D., III |
分类号 |
F25B19/02;F25D3/10;A61B18/02;C09K5/04;F25B7/00;F25B9/00;F25B9/02;F28D7/12;F28F13/06;F28F21/08 |
主分类号 |
F25B19/02 |
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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