Special catheter with flow rate adjusting function for ERCP nasobiliary duct and negative pressure drainage apparatus

The utility model discloses a special catheter for an ERCP nasobiliary duct and a negative pressure drainage apparatus with a flow rate adjusting function, which comprises a connecting catheter, and a flow rate adjusting device is detachably mounted on the connecting catheter; the flow speed adjusting device comprises a working shell, a mounting groove for clamping the connecting guide pipe is formed in the working shell, a locking structure for extruding the connecting guide pipe is arranged in the working shell, a driving rod for driving the locking structure is rotatably mounted in the working shell, and a worm gear is coaxially and fixedly mounted on the driving rod. An adjusting rod is rotationally mounted in the working shell, one end of the adjusting rod rotationally penetrates through the side wall of the working shell, and a worm in meshed connection with the worm gear is coaxially mounted on the adjusting rod and located in the working shell; the flow speed of the connecting guide pipe is adjusted t