A medical device includes a tubular body having a first lumen so designed as to receive a fluid from an opening at one end of the first lumen and discharge the fluid from an opening at the other end of the first lumen, and an expandable body attached to the tubular body. The first lumen communicates with the space inside the expandable body and the expandable body expands by the internal pressure of the fluid which is injected from the opening at one end and enters the space inside the expandable body through the first lumen.
