Catheter

1 . A catheter having a shaft, the shaft comprising:

a wire lumen that extends in a longitudinal direction of the shaft;

a sensor lumen that is arranged side by side with the wire lumen;

a projection part that includes the wire lumen, projects to a more distal side than a distal end of the sensor lumen, and has a distal end opening in communication with the wire lumen at a distal end of the projection part;

a first notch that is a notch formed on a more proximal end side than the projection part, and is in communication with the wire lumen,

wherein the first notch is formed on a side surface of the shaft, the side surface being positioned on an opposite side of the sensor lumen relative to a center axis of the wire lumen, and the shaft includes, in a section including the first notch, a bottom portion facing the first notch and a pair of side walls extending from the bottom portion to the opposite side of the sensor lumen;

a branching lumen between a distal end and a proximal end of the shaft the branching lumen extending from the wire lumen; and

a branching part that is formed at a connection portion between the wire lumen and the branching lumen,

wherein:

a distal end side of the branching lumen is connected to the wire lumen,

a proximal end side of the branching lumen is positioned on a more proximal end side of the shaft than a distal end side,

the proximal end side of the branching lumen is in communication with an outside through a port formed on a side surface of the shaft, and

the branching part includes:

a large diameter portion with an inner diameter larger than an inner diameter of the wire lumen,

a boundary wall separating the wire lumen and the branching lumen from each other on a more proximal end side than the large diameter portion, and

a raised portion that is raised toward a side of the extending branching lumen, in an area on a more distal end side than the large diameter portion and on an opposite side of the extending branching lumen, in an inner peripheral surface defining the wire lumen.

2 . The catheter according to claim 1 ,

wherein the first notch has an elliptical shape including a first long axis extending along the center axis of the wire lumen and a first short axis extending vertically to the center axis in side view of the wire lumen, and

a length of the first short axis is equal to an inner diameter of the wire lumen.

3 . The catheter according to claim 1 ,

wherein the shaft further comprises a second notch that is a notch formed on a more distal end side or the more proximal end side than the first notch, and is in communication with the wire lumen,

the second notch is formed on the side surface of the shaft, the side surface being on a same side as the first notch, and

the shaft includes, in a section with the second notch, a bottom portion facing the second notch and a pair of side walls extending from the bottom portion to the opposite side of the sensor lumen.

4 . The catheter according to claim 3 ,

wherein the second notch has an elliptical shape including a second long axis extending along the center axis of the wire lumen and a second short axis extending vertically to the center axis in side view of the wire lumen, and

a length of the second short axis is equal to the inner diameter of the wire lumen and a length of the second long axis is shorter than a length of the first long axis of the first notch.

5 . The catheter according to claim 1 ,

wherein the port is inclined relative to the center axis of the shaft, and

a distal end of the boundary wall is positioned at the same position as a distal end of the port or on the more distal end side than the distal end of the port in the longitudinal direction of the shaft.

6 . The catheter according to claim 1 ,

wherein a length in the longitudinal direction of the shaft of the boundary wall is equal to or longer than a length in the longitudinal direction of the shaft of the port.

7 . The catheter according to claim 1 ,

wherein, in a first case that a wire is inserted to the wire lumen from the distal end opening, a proximal end portion of the wire is brought into contact with the raised portion and guided toward the branching lumen, and

in a second case that a wire is inserted to the wire lumen from the proximal end side of the shaft, the distal end portion of the wire is brought into contact with the boundary wall to suppress advancement of the distal end portion of the wire toward the branching lumen.

8 . The catheter according to claim 2 ,

wherein the shaft further comprises a second notch that is a notch formed on a more distal end side or the more proximal end side than the first notch, and is in communication with the wire lumen,

the second notch is formed on the side surface of the shaft, the side surface being on a same side as the first notch, and

the shaft includes, in a section with the second notch, a bottom portion facing the second notch and a pair of side walls extending from the bottom portion to the opposite side of the sensor lumen.

9 . The catheter according to claim 8 ,

wherein the second notch has an elliptical shape including a second long axis extending along the center axis of the wire lumen and a second short axis extending vertically to the center axis in side view of the wire lumen, and

a length of the second short axis is equal to the inner diameter of the wire lumen and a length of the second long axis is shorter than a length of the first long axis of the first notch.