Stay wire ring assembly, first pull ring main body, second pull ring main body and bending adjusting sheath tube

The invention provides a pull wire ring assembly, a first pull ring body, a second pull ring body and a bending adjusting sheathing canal, and relates to the technical field of medical instruments. The pull wire ring assembly comprises a first pull ring body, a second pull ring body and a third pull ring body, the first pull ring body is provided with a plurality of abutting pieces protruding towards the far end side, and the two sides of each abutting piece are each provided with a pull wire hole penetrating through the first pull ring body in the axial direction; the second pull ring body is located on the far end side of the first pull ring body, and the second pull ring body is provided with a bearing and abutting part opposite to the pull wire hole. The bending adjusting wire penetrates through the wire pulling hole, so that when the first free end and the second free end of the bending adjusting wire extend to the outer side of the first pull ring body, the first free end and the second free end can mov