Flow regulating assembly and flexible cryoprobe with adjustable flow

Abstract

The present invention provides a flow regulating assembly, including a mandrel, where a regulating chamber is provided in the mandrel; a first end portion of the mandrel is provided with a large air outlet, a side wall of the mandrel is provided with a small air outlet, and the large air outlet has an inner diameter less than that of the regulating chamber; a second end portion of the mandrel is connected to a front end of a J-T slot, and a rear end of the J-T slot is connected to a bypass pipe; a sealing member is arranged in the regulating chamber, and the sealing member has an outer diameter less than or equal to the inner diameter of the regulating chamber and greater than the inner diameter of the large air outlet; the sealing member is connected to one end of a traction member, and the other end of the traction member is led out through the bypass pipe. The sealing member axially moves in the regulating chamber under an action of the traction member, and a quantity of effective air outlets is changed by adjusting a position of the sealing member. This solves the problems that flow regulation methods in related technologies are all implemented through internal control of a host, which is prone to unstable flow, a severe loss of cold energy, an excessively-narrow adjustable range of an operating pressure, and a corresponding excessively-narrow adjustable flow range.