Special seaming device for gastroscopy

A nip device special for gastroscopy comprises a nip body, a rotatable valve deck and a hose, the main body structure of the nip body is in an oval barrel shape, an outer end face is arranged at the outer end of the nip body, and an inner end face is arranged at the inner end of the nip body. A limiting ring is arranged on the inner end face of the seaming body and is higher than the side wall of the seaming body, so that the seaming body is in a barrel shape with two large ends and a small middle, a plurality of through holes are formed in the periphery of the outer end face, round pipes are arranged on the through holes, and the round pipes can fix a hose and extend towards the inner end face, so that communication between the inside and the outside can be achieved through the hose. A circular step pipe extending outwards is arranged at the position of the circular hole in the outer end face, a valve cover is fixed to the step pipe so that the valve cover can rotate around the step pipe, a valve pipe is arr