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Erschienen in:
1986 | OriginalPaper | Buchkapitel
The Development of Cryosurgical Instruments for Internal Medicine
verfasst von : J. D. Montmayeur, P. Le Pivert, J. Verdier
Erschienen in: Advances in Cryogenic Engineering
Verlag: Springer US
Enthalten in: Professional Book Archive
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New types of cryoprobes have been developed for the cryodestruction of varicose veins and internal lesions such as bronchial, gastric, colonic tumors or oesophageal tumors or varices. These probes can be introduced inside the operative channels of commercially available endoscopes dues to their small diameter (2 or 3 mm) and flexibility. The operating principle is J.-T.expansion of nitrous oxyde inside the tip of the probe where a heat exchanger and self controled flow to avoid cooling down of the feeder. Furthermore the probes are designed for monitoring the size of the frozen area by means of the bioelectrical low frequency impedance method which is essential for correct use and standardisation of the procedure. The probes are described and examples are given of the field of application.