Gun type casing and tieing device for proctopolypus

The utility model relates to a gun type ligation device for rectal polyp, which comprises a gun body. The inside of the gun body is provided with a negative pressure attracting device and a he advancing device of a ligation ring (22), wherein, the negative pressure attracting device is composed of a negative pressure cylinder (21), a piston (23), a connecting plate (20), a trigger (18), a reset spring (19) and an end cover (1), and the advancing device of the ligation ring (22) is composed of a negative pressure pipe (15), a sleeve pipe (16), a reset spring (25), a suction inlet (8) and a sliding sleeve (6). The utility model is mainly characterized in that the gun body is also provided with an observation device which is composed of an observation pipe (4), an eyepiece (3) and an observation mirror (7), and a light source device which is composed of a conducting line (17), an electrical ball (13), a spotlight cylinder (29), a light transmission mirror (9) and a power supply. The utility model can carry out ligation treatment to the rectal polyp within the range of 20 centimeters far away form the anus under the direct vision of human eyes. The wound surface can automatically heal. The utility model has the advantages of short treating time, good treating effect, etc.