Suction catheter, suction system, and treatment method

1. A method for suctioning an object in a blood vessel, the method comprising:

inserting an expansion portion connected to a shaft portion on a distal portion of the shaft portion into the blood vessel;

expanding the expansion portion in the blood vessel;

inserting a suction catheter along the shaft portion into the blood vessel;

reciprocating at least the expansion portion or the suction catheter relative to each other along an axial axis of the shaft portion;

breaking the object by a proximal side coupling portion of the expansion portion and the suction catheter; and

suctioning the object with the suction catheter.

2. The method according to claim 1 , further comprising:

removing the suction catheter and the expansion portion from the blood vessel.

3. The method according to claim 1 , wherein after the expanding of the expansion portion, the method further comprising:

folding a proximal portion of the expansion portion along the axial axis of the shaft portion into a distal side of the proximal portion of the expansion portion.

4. The method according to claim 3 , wherein after the folding of the proximal portion of the expansion portion, while fixing a positon of a distal side of the expansion portion, the method further comprising:

reciprocating only the proximal portion of the expansion portion along the axial axis of the shaft portion.

5. The method according to claim 1 , wherein the expanding of the expansion portion in the blood vessel comprises:

indwelling the expansion member into the blood vessel.

6. The method according to claim 1 , wherein the expansion portion comprises:

a cylindrical member having a plurality of gaps and being resiliently deformable.

7. A method for suctioning an object in a blood vessel, the method comprising:

inserting an expansion portion connected a shaft portion on a distal portion of the shaft portion into the blood vessel;

expanding the expansion portion in the blood vessel;

inserting a suction catheter along the shaft portion into the blood vessel;

moving a proximal side coupling portion of the expansion portion or the suction catheter along an axial axis of the shaft portion relative to each other along an axial axis of the shaft portion;

breaking the object by the proximal side coupling portion and the suction catheter; and

suctioning the object by the suction catheter.

8. The method according to claim 7 , further comprising:

removing the suction catheter and the expansion portion from the blood vessel.

9. The method according to claim 7 , wherein after the expanding of the expansion portion, the method comprising:

folding a proximal portion of the expansion portion along the axial axis of the shaft portion into a distal side of the proximal portion of the expansion portion.

10. The method according to claim 9 , wherein after the folding of the proximal portion of the expansion portion, while fixing a positon of a distal side of the expansion portion, the method comprising:

reciprocating only the proximal portion of the expansion portion along the axial axis of the shaft portion.

11. A method for suctioning an object in a blood vessel, the method comprising:

inserting an expansion portion connected to a shaft portion on a distal portion of the shaft portion into the blood vessel;

expanding the expansion portion in the blood vessel;

inserting a suction catheter along the shaft portion into the blood vessel;

inserting a breaking device into the blood vessel along the shaft portion;

breaking the object by the breaking device;

moving a proximal side coupling portion of the expansion portion or the suction catheter along an axial axis of the shaft portion relative to each other along an axial axis of the shaft portion;

suctioning a broken object by the suction catheter; and

removing the suction catheter and the expansion portion from the blood vessel.

12. The method according to claim 11 , wherein after the expanding of the expansion portion, the method comprising:

folding a proximal portion of the expansion portion along the axial axis of the shaft portion into a distal side of the proximal portion of the expansion portion.

13. The method according to claim 11 , wherein after the folding of the proximal portion of the expansion portion, while fixing a positon of a distal side of the expansion portion, the method comprising:

moving only the proximal portion along the axial axis of the shaft portion.

14. The method according to claim 11 , wherein the moving of the proximal side coupling portion of the expansion portion or the suction catheter along the axial axis of the shaft portion relative to each other along an axial axis of the shaft portion comprises:

reciprocating the proximal side coupling portion of the expansion portion or the suction catheter along the axial axis of the shaft portion.

15. The method according to claim 11 , wherein after the breaking of the object, the method comprising:

removing the breaking device from the blood vessel.

16. The method according to claim 15 , wherein after the removing of the breaking device, the method comprising:

moving the suction catheter to the expansion portion and suctioning the broken objects in the folded proximal portion by the suction catheter.

17. The method according to claim 11 , wherein the moving the proximal side coupling portion of the expansion portion or the suction catheter along the axial axis of the shaft portion relative to each other along an axial axis of the shaft further comprises:

moving the proximal side coupling portion of the expansion portion to or into a distal opening of the suction catheter to further break the broken object.

18. The method according to claim 11 , wherein the expansion portion is a filter.

19. The method according to claim 11 , comprising:

generating a negative pressure in the suction catheter by pulling a plunger of a syringe connected to the suction catheter; and

adhering the broken objects to the expansion portion.