Three-way orifice joint for electronic imaging catheter

The utility model discloses a three-way cavity joint for an electronic imaging catheter, which relates to the technical field of medical instruments and comprises a three-way cavity joint, a joint cover and a connecting piece, the joint cover is connected with the three-way cavity joint through the connecting piece, and the three-way cavity joint consists of a multifunctional joint, a fixing column and a suction interface. Sampling or treatment of tissue lesions is carried out through biopsy forceps or other instruments under an instrument cavity inlet, and an injector can be connected for dosing; the fixing column connects the three-way cavity joint to the inside of the handle of the imaging catheter; the suction connector can be connected with a negative pressure suction pipeline to suck blood or secretions in the body through negative pressure suction. By means of the design of the single cavity channel and the multiple outlets, the function of negative pressure suction can be achieved while an instrument