10 Cryosurgical apparatus for use in performing ablative surgery; medical devices, namely, cryotherapy and cryosurgical devices, namely, surgical and treatment probes, catheters, and control systems for cryotherapy and cryosurgical devices, namely, apparatuses for controlling the flow of cryogens, and for controlling bleeder and pressure reduction valves for maintaining pressure in cryotherapy and cryosurgical devices and delivery systems; cryosurgical apparatus and instruments, namely, catheters; cryosurgical tools or units used to destroy tissue during surgical procedures, namely, catheters for the introduction of a cryogen to a target tissue; cryotherapy and cryosurgical delivery systems and components thereof for delivering cryogens to a patient, namely, surgical and treatment probes, and catheters; cryosurgical and cryotherapy device control systems, namely, apparatuses for controlling the flow of cryogens, bleeder and pressure reduction valves for maintaining pressure in cryotherapy and cryosurgical devices and delivery systems, and catheters; cryotherapy and cryosurgical delivery systems and components thereof, namely, apparatuses for controlling the flow of cryogens, bleeder and pressure reduction valves for maintaining pressure in the cryotherapy and cryosurgical devices and delivery systems, and catheters