Medical device

1. A medical device for endoscopically conducting negative pressure therapy on a bursiform cavity having an opening in a body, the medical device comprising:

a longitudinal axis member comprising a lumen extending from a proximal end to a distal end of the longitudinal axis member along a longitudinal axis and that is configured to be inserted through the bursiform cavity, the longitudinal axis member is configured to be inserted into the body;

an expansion part which is provided at the distal end of the longitudinal axis member, the expansion part having a plurality of wire members being deformed outward in a radial direction of the longitudinal axis member to follow an inner wall of the bursiform cavity;

a suction member comprising a porous sponge member including a plurality of vacancies and covers an outer surface of the expansion part, the suction member is configured to be inserted into the bursiform cavity in an axial direction of the longitudinal axis member from an opening of the bursiform cavity to a position where the suction member contacts with a bottom of the bursiform cavity to determine a position at which the expansion part is expanded, and when the suction member is inserted into the bursiform cavity and the expansion part is expanded, a region from the opening of the bursiform cavity to the inner wall of the bursiform cavity is closely contacted by a contact surface of the suction member and sucked by the suction member;

a suction source which is provided at the proximal end of the longitudinal axis member and connected to the lumen to suck the inner wall of the bursiform cavity via the suction member; and

a closing member which is provided at an axial end of the suction member to close the opening of the bursiform cavity to airtightly seal the bursiform cavity.

2. The medical device according to claim 1 , wherein the closing member is curved toward the suction member in a concave shape.

3. The medical device according to claim 1 , further comprising a pusher for moving the closing member, wherein

the lumen is connected with the suction member, and

the closing member is mounted on the longitudinal axis member.

4. The medical device according to claim 3 , wherein the closing member is formed of an elastically deformable material, is introduced into the body in a state in which a diameter thereof is reduced less than that of an initial shape, and is restored to the initial shape in the body.

5. The medical device according to claim 1 , further comprising:

a manipulation member which is used to deform the expansion part between a first shape and a second shape enlarged over the first shape.

6. A medical device for conducting negative pressure therapy on a local site in a body, the medical device comprising:

a longitudinal axis member which has a lumen extending from a proximal end to a distal end of the longitudinal axis member along a longitudinal axis and configured to be inserted into the body;

an expansion part which is provided at the distal end of the longitudinal axis member, the expansion part having a wire member that is formed in a cylindrical shape with a predetermined length along the longitudinal axis and configured to be enlarged to a predetermined diameter;

a suction member comprising a porous sponge member including a plurality of vacancies, covers an lateral surface of the expansion part and is provided at a distal end of the longitudinal axis member, and when the suction member is inserted into the tubular cavity and the expansion part is expanded, a predetermined region of the inner wall of the tubular cavity is closely contacted by a contact surface of the suction member and sucked by the suction member;

a suction source which is provided at a proximal end of the longitudinal axis member and connected to the lumen, the suction source sucking the inner wall of the tubular cavity via the suction member; and

a closing member which is provided at two axial ends of the suction member to airtightly seal the inner wall of the tubular cavity that is closely contacted by the contact surface of the suction member.

7. The medical device according to claim 6 , wherein the expansion part that is formed in an approximately cylindrical shape, is disposed inside the suction member, and enlarges dimensions of the suction member by changing from a first shape to a second shape.

8. The medical device according to claim 7 , further comprising a covering member that is mounted on an outer or inner peripheral surface of the expansion part and retains airtightness of an inner cavity of the expansion part.

9. The medical device according to claim 6 , wherein the expansion part is expanded by a negative pressure from the suction member via a tube which is provided at the closing member provided at the distal end of the longitudinal axis member.