A CRYOGENIC SYSTEM AND METHOD OF USE

摘要

A cryogenic medical device for deliv-ery of subcooled liquid cryogen to various configura-tions of cryoprobes is designed for the treatment of damaged, diseased, cancerous or other unwanted tis-sues. The device is a closed or semi-closed system in which the liquid cryogen is contained in both the sup-ply and return stages. The device is capable of gener-ating cryogen to a supercritical state and may be uti-lized in any rapid cooling systems. As designed, the device comprises a number of parts including a vacu-um insulated outer dewar, submersible cryogen pump, baffled linear heat exchanger, multiple pressurization cartridges, a return chamber, and a series of valves to control the flow of the liquid cryogen interconnected with cryotreatment devices including cryoprobes and catheters. The cryogenic medical device promotes subcooling to the tips of various external cryogenic instrument configurations.