Aspiration system and aspiration method

1 . An aspiration method for capturing and aspirating an object flowing within a lumen of a living body, the aspiration method comprising:

inserting an aspiration device into the lumen of the living body;

inserting a capture device provided with an expandable capture unit and a capture wire extending from the capture unit into an inner cavity of the aspiration device and moving the capture device to a desired position;

inserting the capture wire through a lumen of an excision device and inserting the excision device into the inner cavity of the aspiration device and moving the excision device to a desired position;

excising a lesion with the excision device;

withdrawing the excision device from the aspiration device;

allowing the aspiration device to start aspiration of the object, or the excised lesion, captured by the capture unit; and

allowing the capture wire and the aspiration device to move relatively in a distal direction and a proximal direction at a frequency of 2 times/second to 5 times/second.

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

moving the capture wire and the aspiration device relatively in the distal direction and the proximal direction at a frequency of less than 2 times/second in a state where a distal end opening that causes an aspiration force to act on outside of the aspiration device is surrounded by the object to be aspirated.

3 . The aspiration method according to claim 1 , further comprising:

starting the aspiration of the object, or the excised lesion, captured by the capture unit before moving the capture wire and the aspiration device relatively in the distal direction and the proximal direction at the frequency of 2 times/second to 5 times/second.

4 . The aspiration method according to claim 1 , further comprising:

starting the moving of the capture wire and the aspiration device relatively in the distal direction and the proximal direction at the frequency of 2 times/second to 5 times/second before the aspiration of the object, or the excised lesion, captured by the capture unit.

5 . The aspiration method according to claim 1 , wherein the capture unit includes a plurality of linear members that is deformable and braided into a net-like cylindrical body, a distal side coupler that couples distal portions of the plurality of linear members, and a proximal side coupler that couples proximal portions of the plurality of linear members and is coupled to the capture wire, the proximal side coupler includes an inner tube and an outer tube that surrounds the inner tube, and the inner tube has a proximal portion located closer to a proximal side of the proximal side coupler than a proximal portion of the outer tube.

6 . An aspiration method for capturing and aspirating an object flowing within a lumen of a living body, the aspiration method comprising:

inserting an aspiration device into the lumen of the living body;

inserting a capture device provided with an expandable capture unit and a capture wire extending from the capture unit into an inner cavity of the aspiration device and moving the capture device to a desired position;

inserting the capture wire through a lumen of an excision device and inserting the excision device into the inner cavity of the aspiration device and moving the excision device to a desired position;

excising a lesion with the excision device;

allowing the capture wire and the aspiration device to move relatively in a distal direction and a proximal direction at a frequency of 2 times/second to 5 times/second; and

allowing the aspiration device to start aspiration of the object, or the excised lesion, captured by the capture unit.

7 . The aspiration method according to claim 6 , wherein the capture wire and the aspiration device are relatively moved in the distal direction and the proximal direction at a frequency of less than 2 times/second in a state where a distal end opening that causes an aspiration force to act on outside of the aspiration device is surrounded by the object to be aspirated.

8 . The aspiration method according to claim 6 , further comprising:

starting the aspiration of the object, or the excised lesion, captured by the capture unit before moving the capture wire and the aspiration device relatively in the distal direction and the proximal direction at the frequency of 2 times/second to 5 times/second.

9 . The aspiration method according to claim 6 , further comprising:

starting the moving of the capture wire and the aspiration device relatively in the distal direction and the proximal direction at the frequency of 2 times/second to 5 times/second before the aspiration of the object, or the excised lesion, captured by the capture unit.

10 . The aspiration method according to claim 6 , wherein the capture unit includes a plurality of linear members that is deformable and braided into a net-like cylindrical body, a distal side coupler that couples distal portions of the plurality of linear members, and a proximal side coupler that couples proximal portions of the plurality of linear members and is coupled to the capture wire, the proximal side coupler includes an inner tube and an outer tube that surrounds the inner tube; and the inner tube has a proximal portion located closer to a proximal side of the proximal side coupler than a proximal portion of the outer tube.