Catheter system

1. A catheter system comprising:

a shaft main body having an elongated shape, a rotation axis lumen including a rotation central axis, and a revolving lumen that revolves around the rotation axis lumen when the shaft main body is rotated about the rotation central axis,

a protective shaft that is inserted into the rotation axis lumen and protrudes from the rotation axis lumen; and

a protective member provided on a distal side of the protective shaft and configured to limit flow of a fluid in a living body lumen; wherein

the shaft main body includes a side-by-side portion in which at least a portion of the rotation axis lumen and a portion of the revolving lumen exist in side-by-side relationship;

the shaft main body includes a branch part at which the revolving lumen branches off from the side-by-side portion to form a distal shaft that is not in side-by-side relationship with the rotation axis lumen, the protective shaft protruding further distally than the distal shaft, and

the distal shaft has a proximal-side bending portion that bends in such a direction as to become farther away from the rotation axis lumen in a radial direction and an opening that communicates with the revolving lumen.

2. The catheter system according to claim 1 , wherein

the distal shaft has one or a plurality of distal-side bending portions that bend in a different direction from the proximal-side bending portion.

3. The catheter system according to claim 2 , wherein

for at least one of the distal-side bending portions, a central point that defines a radius of curvature of a central axis of the revolving lumen at the distal-side bending portion is located between the rotation central axis and the distal-side bending portion.

4. The catheter system according to claim 2 , wherein

a central axis of the revolving lumen from the branch part to any one of the distal-side bending portions is located in a first plane and at least part of the central axis of the revolving lumen on the distal side relative to the distal-side bending portion is located in a second plane intersecting the first plane.

5. The catheter system according to claim 1 , wherein

the opening is disposed to face inside in the radial direction of rotation across a whole circumference when the distal shaft rotates around the rotation central axis of the rotation axis lumen.

6. The catheter system according to claim 1 , wherein:

the protective member comprises a balloon catheter having a balloon, and

the protective shaft is caused to swing or rotate when the shaft main body rotates around the rotation central axis of the rotation axis lumen.

7. The catheter system according to claim 6 , wherein

the side-by-side portion, the distal shaft, and the protective shaft each rotate at a different maximum diameter when the shaft main body rotates around the rotation central axis of the rotation axis lumen.

8. A catheter system comprising:

a shaft main body having an elongated shape and a lumen defining an axis of the shaft main body, said lumen being in communication with an opening;

a distal shaft for aspiration having a distal end on a distal side of the opening and being disposed such that a distance between the distal shaft and the axis increases toward the distal end of the distal shaft;

a suction apparatus in communication with a lumen of the distal shaft; and

a balloon catheter or a filter positionable in the lumen of the shaft main body during aspiration.

9. The catheter system according to claim 8 , wherein a distalmost end portion of the shaft main body is parallel to the axis of the shaft main body.

10. The catheter system according to claim 8 , wherein the suction apparatus comprises a syringe.

11. A catheter system comprising:

a shaft main body having an elongated shape and a lumen defining an axis of the shaft main body, said lumen being in communication with an opening;

a distal shaft for aspiration having a distal end on a distal side of the opening and being disposed such that a distance between the distal shaft and the axis increases toward the distal end of the distal shaft;

a balloon catheter or a filter positionable in the lumen of the shaft main body during aspiration; and

a suction apparatus in communication with a lumen of the distal shaft and with the lumen of the main shaft body.

12. The catheter system according to claim 11 , wherein the suction apparatus comprises a syringe.