Abstract: Cryogenic apparatus, consisting of a connector that has a connector base plate configured for connection to a conduit carrying a cryogen, and a slot extending across the base plate. The apparatus has a plug, which is configured for insertion into an opening in the base plate. The apparatus also has a latch plate that is configured to slide within the slot between a first position, in which the plug is inserted through an aperture in the latch plate into the opening, and a second position, in which a cryogenic probe is inserted through the aperture and brought into fluid communication with the opening. There is a sensor, which is coupled to control a flow of the cryogen through the conduit by detecting whether the latch plate is in the first position or the second position.

Abstract: Apparatus, consisting of a single insulated container, configured to contain a cryogen. The apparatus also has a first pump and a second pump, both disposed in the single insulated container and configured to pump the cryogen from the single insulated container while immersed in the cryogen. A first probe and a second probe, having respective first and second proximal ends, are coupled to receive concurrently the cryogen pumped by the first pump and the second pump, respectively. The probes have respective first and second distal ends, which are chilled by the cryogen received through the first and second proximal ends and which are configured to be inserted into a body of a living subject.