Disclosed is a cannula assembly with a hook-shaped balloon, the cannula assembly comprising a first sealing assembly and a second sealing assembly, wherein the second sealing assembly comprises a lower housing and a hollow cannula connected thereto and extending towards a distal end thereof, the first sealing assembly, the second sealing assembly and the hollow cannula comprise instrument passages communicated and substantially aligned with each other, and the hollow cannula comprises an inner cylindrical surface, an outer cylindrical surface and a cannula wall therebetween and the distal end of the hollow cannula further comprises an open cannula lip, the cannula lip comprises an inclined cylindrical surface between an open lip portion and a transition lip portion, and the inner cylindrical surface and the inclined cylindrical surface define an inclined cannula wall. A balloon assembly comprises a balloon axis, a balloon lip and a balloon body connected thereto, an included angle formed between the balloon body and the balloon axis is an acute angle, and the balloon assembly further comprises an outer cannula or an arc-shaped extending sheet connected to the balloon body, and the hook-shaped appearance thereof is formed by the outer cannula or the extending sheet and the balloon body.Linvention concerne un ensemble canule à ballonnet en forme de crochet, lensemble canule comprenant un premier ensemble détanchéité et un second ensemble détanchéité, le second ensemble détanchéité comprenant un boîtier inférieur et une canule creuse reliée à ce dernier et sétendant vers son extrémité distale, le premier ensemble détanchéité, le second ensemble détanchéité et la canule creuse comprenant des passages dinstrument communiquant et sensiblement alignés les uns avec les autres, et la canule creuse comprenant une surface cylindrique interne, une surface cylindrique externe et une paroi de canule entre ces dernières et lextrémité distale de la canule creuse comprenant en outr
