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Abstract

A cryosurgical apparatus capable of operating both a first cryoprobe with a pressure-resistant return run and a second cryoprobe with an unpressurized return run. The apparatus has a first mode for operating the first cryoprobe and a second mode for operating the second cryoprobe. The apparatus includes a controller, a fluid source for providing a fluid for cooling the cryoprobes by of the Joule-Thomson effect, at least two cryoprobe connections one of which is connected to the first and second cryoprobe in the first and second mode, respectively, and a pressure-setting device with at least one proportional valve. The pressure-setting device can regulate, in the first and second modes, the pressure ratio of the admission run to the return run of the cryoprobe and the pressure in the admission run of the cryoprobe, respectively. The controller controls the cooling power of the cryoprobes by way of setting the proportional valve.

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First Claim