Biliary tract drainage catheter with internal and external drainage and stenosis expansion functions

The invention relates to a biliary tract drainage catheter with internal and external drainage and stenosis expansion functions, and belongs to the technical field of medical instruments. An expansion balloon is arranged on the drainage catheter body, side holes are formed in the drainage catheter body on the two sides of the expansion balloon, and the side holes are communicated with a catheter cavity of the drainage catheter body. Based on the PTBD operation under ultrasonic guidance, one-stop conservative treatment of a biliary tract stenosis patient can be achieved according to clinical requirements, and the treatment functions of internal drainage, external drainage and/or stenosis section balloon dilatation are achieved. 本发明涉及一种兼具内外引流及狭窄扩张功能的胆道引流导管，属于医疗器械技术领域。引流导管管体上设有扩张球囊，扩张球囊两侧的引流导管管体上设有侧孔，侧孔与引流导管管体的管腔连通。通过本发明基于超声引导下PTBD术，可根据临床需求，实现对胆道狭窄患者的一站式保守治疗，实现内引流、外引流和/或狭窄段球囊扩张的治疗功能。