Medical device

A medical device operated by an operator to cauterize a puncture hole in a living body, the medical device comprising:

• an expansion body positionable in the puncture hole in the living body and having opposite axial end portions that are relatively movable so that as the opposite axial end portions approach one another the expansion body expands radially outwardly towards the edge of the puncture hole in the living body, and as the opposite axial end portions approach one another the expansion body contracts radially inwardly away from the edge of the puncture hole in the living body, the opposite axial end portions including a proximal end portion and a distal end portion;
• an electrode positioned on the expansion body to contact an edge of the puncture hole in the living body as the expansion body expands radially outwardly to cauterize the edge of the puncture hole;
• an elongated outer tube having a distal end portion fixed to the proximal end portion of the expansion body;
• a shaft positioned in the elongated outer tube, the shaft being axially movable in an axial direction relative to the elongated outer tube and including a portion that extends distally beyond the distal end portion of the elongated outer tube, the portion of the shaft that extends distally beyond the distal end portion of the elongated outer tube being fixed to the distal end portion of the expansion body;
• a housing having an interior through which passes the shaft;
• a manually engageable part that is slidably mounted on the housing and that is manually engageable by the operator to slidably move the manually engageable part in a rearward direction relative to the housing;
• the manually engageable part being operatively connected to the shaft by way of an elastically deformable part so that sliding movement of the manually engageable part in the rearward direction results in movement of the shaft in the rearward direction and elastic deformation of the elastically deformable part.

A medical device comprising:

• an expansion body expandable and contractible in a radial direction, the expansion body possessing a proximal end;
• a shaft portion that is elongated and includes a distal end part including a proximal end fixing portion to which the proximal end of the expansion body is fixed;
• a hand operation unit disposed on a proximal side of the shaft portion;
• the shaft portion including a pulling shaft that is movable in an axial direction to compress the expansion body in the axial direction;
• the hand operation unit including a pulling operation unit that moves the pulling shaft in the axial direction;
• and
• the pulling shaft and the pulling operation unit being connected to each other with a buffer portion interposed between the pulling shaft and the pulling operation unit, the buffer portion being elastically deformable along the axial direction of the pulling shaft.