Apparatus for lifting maxillary sinus

An apparatus for lifting a maxillary sinus, comprising:

• a pillar, having a top portion and a bottom portion, wherein the top portion is a cutting blade and the bottom portion is an engaging base;
• a transmission shaft, having a top portion, wherein the top portion is a transmission base, and a shape of the transmission base is corresponds to that of the engaging base;
• an elastic element, wherein one end of the elastic element is physically connected to the engaging base, the other end of the elastic element is physically connected to the transmission base, so as to provide an elastic force between the engaging base and the transmission base;
• and
• a seal element, wrapping the engaging base, the elastic element, and the transmission base;
• wherein when the cutting blade encounters a drag force, the transmission base moves toward the engaging base, presses the elastic element located inside the seal element, and causes the transmission base and the engaging base to be engaged with each other.