Negative pressure suction sheath

A negative pressure suction sheath, comprising a sheath, a negative pressure joint, and a dilator, wherein the negative pressure joint comprises a main channel cavity and a negative pressure suction channel cavity located at one side of the main channel cavity, a proximal end of the sheath is connected to a distal end of the main channel cavity, and the dilator is inserted from a proximal end of the main channel cavity and extends out of a distal end of the sheath, and is detachably connected to the main channel cavity;

• one side of the main channel cavity is provided with a side channel port, and the negative pressure suction channel cavity is communicated with the side channel port;
• a cavity wall of the main channel cavity is further provided with a pressure regulating port, the pressure regulating port is disposed corresponding to the side channel port or disposed at one end, away from the sheath, of the side channel port, and a negative pressure in the sheath may be adjusted by adjusting an opening size of the pressure regulating port, wherein the proximal end of the main channel cavity is further provided with a sealing washer and a fixing member, and the sealing washer is hermetically fixed at the proximal end of the main channel cavity by using the fixing member;
• the sealing washer is provided with an inner hole, so that the dilator and/or a surgical device inserted into the main channel cavity is fixedly sleeved in the inner hole of the sealing washer to achieve a fixed connection with the main channel cavity, wherein in a natural state, a diameter of the inner hole of the sealing washer is not larger than an outer diameter of the dilator and/or the surgical device, wherein in a natural state, a diameter of the inner hole of the sealing washer is larger than an outer diameter of the dilator and/or the surgical device, a degree of compression on the sealing washer is adjusted by using the fixing member, and then a size of the inner hole of the sealing washer is adjusted, so that the dilator and/or the surgical device inserted into the main channel cavity is fixedly sleeved in the inner hole of the sealing washer.