Air-pressure-type constant-tensile force orthodontic apparatus

The invention discloses an air-pressure-type constant-tensile force orthodontic apparatus which includes a cylinder body. An upper cover of the cylinder body is connected to a buckle ring via a bolt.A piston is located in the cylinder body. A sealing ring is bonded to edge of the piston via medical bio-glue, so that the piston is sealed relative to the inner wall of the cylinder body. An elasticpositioning clip is fixed to a projection on the piston via a bolt. One end of an arch wire passes through a central hole in the buckle ring and enters the cylinder body, then is positioned at the geometric center of the piston via a right angle groove in the elastic positioning clip and is clamped and fixed by the bolt and a nut. A seal gasket and a bottom plate are fixed to the bottom of the cylinder body. The orthodontic apparatus can generate a constant traction force to teeth, which is free of attenuation. 本发明公开了种气压式恒拉力口腔正畸装置，包括缸体，缸体上盖与扣环通过螺栓连接，缸体内设有活塞，医用生物胶将密封圈与活塞的边缘粘结，使活塞能够与缸体内壁密封，弹性定位夹通过螺栓固定在活塞的凸起上，弓丝端穿过扣环的中心孔进