A balloon system for treating sinusitis or allergic rhinitis comprises an axially extending central inner tube (1), a balloon (2), and a balloon external guiding pipe (3). The central inner tube (1) axially comprises a far-end part (11) and a near-end part (12) detachably connected to each other through a connecting piece (4). A first end (21) of the balloon (2) is connected to the far-end part (11). A second end (22) of the balloon (2) is detachably connected to the balloon external guiding pipe (3) through the connecting piece (4). The balloon external guiding pipe (3) and the near-end part (12) are kept facing outwardly and separated. The connecting piece (4) comprises a first cushion ring (41) and a second cushion ring (42) rotatable coaxially and fastened to each other axially. The first cushion ring (41) and the second cushion ring (42) both have at least one air guiding hole (410, 420). The balloon system may be used for drug administration based on dosage during a minimally invasive procedure and/or after a minimally invasive procedure, and may also be directly used after rotary varicotomy for sinuses or without rotary varicotomy. By leaving an inflated balloon (2) at a focus position of a patient, a short-term or long-term temporary supporting effect can be achieved.La présente invention concerne un système de ballonnet pour le traitement de la sinusite ou de la rhinite allergique, le système de ballonnet comprenant un tube interne central s'étendant axialement (1), un ballonnet (2), et un tuyau de guidage externe de ballonnet (3). Le tube interne central (1) s'étendant axialement comprend une partie d'extrémité distale (11) et une partie d'extrémité proximale (12) raccordées de manière amovible l'une à l'autre par un raccord (4). Une première extrémité (21) du ballonnet (2) est raccordée à la partie d'extrémité distale (11). Une seconde extrémité (22) du ballonnet (2) est raccordée de manière amovible au tuyau de guidage externe de ballonnet (3) par le rac
