a fluid medium supplied within an internal space between the shaft and an intermediate lumen positioned between the shaft and a central feeding lumen of the cryosurgical instrument the temperature of the fluid medium is controlled to provide control of the temperature differential application_number US 81281909 A description fig1 a fig1 b and fig1 c show an axial cross section of a cryoprobe according to some embodiments of the present invention with an intermediate lumen for receiving a temperature controlling fluid preferably a heating and insulating gas and a quick coupling construction for easy assembly this embodiment of cryoprobe 100 comprises the elongated external shaft 101 which terminates at its distal edge with cryotip 102 a central feeding pipe 103 is situated in shaft 101 preferably the proximal end of the central feeding pipe 103 protrudes from the proximal end of shaft 101 the proximal sections of the elongated external shaft 101 and the central feeding pipe 103 serve for installation of a male unit 119 for quick coupling the extreme proximal section of the shaft 101 is preferably somewhat radially projected to prevent movement past a certain point with regard to male unit 119 thermal insulation of the elongated external shaft 101 is ensured by an intermediate tube 104 with two flanged ends 105 and 106 wherein the outer diameter of the formed flanges 105 and 106 conforms to the internal diameter of the shaft friction between the internal surface of the elongated external shaft 101 and flanged ends 105 and 106 ensures stable.