A medical apparatus may include an inflatable tubular component that can be inflated into a U-shaped structure, a plurality of connecting portions formed on a main body. In one embodiment, the connecting portion can be used for inflating an inflatable cylindrical component formed in the U-shaped structure. The medical apparatus treatment may further include a plurality of control filaments disposed on an inner surface of the U-shaped structure to control the size thereof, so the inner surface of the U-shaped structure can tightly press against an outer surface of the inflatable cylindrical component when it is inflated, and a chamber is formed in the U-shaped structure next to the inflated cylindrical component. When in use, the stones can be trapped into the chamber and chemical reagents can be introduced to either dissolve or disrupt the stones.
