Minimally invasive surgical device

A minimally invasive surgical device comprising:

• a main body comprising an inner tube and an outer tube, the inner tube being disposed in the outer tube;
• an elastic assembly, one end of the elastic assembly being connected to the inner tube;
• and
• a cutter bit connected to an opposite end of the elastic assembly and having a cutting portion, wherein when the cutting portion is in contact with an object, the elastic assembly is adapted to enable the cutter bit to move relatively to the inner tube to decrease a cutting force between the cutting portion and the object, and is adapted to enable the cutting portion to be tilted along with a surface of the object,
• wherein the elastic assembly comprises an elastic member and a universal joint, the elastic assembly connects the inner tube and the cutter bit and is at least partially disposed in the inner tube, the universal joint is connected between the elastic member and the cutter bit, the elastic member of the elastic assembly is entirely located inside the inner tube, and the elastic member is located outside the universal joint, and
• the universal joint is slidably disposed in the inner tube along a direction parallel to a center axis of the inner tube, the center axis passes through the universal joint, the cutting portion is located on an upper surface of the universal joint and is extended outward from the center axis along a radial direction of the center axis.