Special catheter with fixing structure for ERCP nasobiliary duct and negative pressure drainage apparatus

The utility model discloses a special catheter with a fixing structure for an ERCP nasobiliary duct and a negative pressure drainage apparatus, which comprises a connecting catheter, the connecting catheter is detachably provided with the fixing structure, the fixing structure comprises a connecting base, the end face of one side of the connecting base is fixedly connected with a bearing plate through a fixing rod, and the end face of the other side of the connecting base is fixedly connected with the fixing rod. A bonding layer is arranged on the end face, away from the bearing plate, of the connecting base, a mounting groove is fixedly formed in the bearing plate, the connecting guide pipe is detachably mounted in the mounting groove, a rotating ring is coaxially and rotationally connected to the side wall of the bearing plate, and a protective cover is detachably mounted on the end face, close to the mounting groove, of the rotating ring; the side wall of the protective cover is provided with an opening fo