Interventional catheter with distance measuring function

The invention discloses an interventional catheter with a distance measuring function. The interventional catheter comprises a catheter body and a distance measuring structure, the distance measuring structure comprises a telescopic rod which telescopically moves along the axial direction and a shell which is used for sleeving the telescopic rod; a springback structure for driving the telescopic rod is arranged between the telescopic rod and the shell; the distance measuring structure can respond to the state of the telescopic rod and feed back position/displacement/motion signals of the telescopic rod through the signal conversion module. Whether the interventional catheter is placed in place or not is determined by measuring the distance from the far end of the acting part of the interventional catheter to a critical interface; besides, based on the distance between the interventional catheter action part and the critical interface, the working state of the interventional catheter action part can be control