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Design and experiment of a new ultra-cryoablation system.

[In Chinese. / En chinois.]

Author(s) : ZHAO Q., YANG P., CHANG Z.

Type of article: Article

Summary

A new type of an ultra-cryoablation system was developed to obtain the needed low-temperature on the tip of a cryoprobe by J-T effect using precooling nitrogen. The input-pressure and the precooling temperature of nitrogen were determined to be 8.5 MPa and -125°C, respectively, by the experiment and in consideration of the economic factor. The performance test shows that the cryoprobe could generate an ice ball with a diameter of up to 4 cm and the length of 5.8 cm in 20°C water for ten minutes, better than an argon-helium cryoprobe. An ice ball with a diameter of 3.7 cm were generated in a pig liver in the first ten minutes and it grew fast. In the experiment on a living pig, the liver cells in the frozen section were completely dead after four days and connective tissue was generated at the edge of the frozen section after fifteen days.

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Pages: pp. 57-60

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