Medical balloon catheter and manufacturing method of medical balloon catheter
A medical catheter includes a multi-lumen tube including a first lumen and a second lumen; an extension tube fixed to an end surface in a longitudinal direction of the multi-lumen tube, extending from the end surface along the longitudinal direction, and including a third lumen communicating with the first lumen; and an outer wall portion extending from the multi-lumen tube along the extension tube and configured to cover a part of an outer surface of the extension tube, the outer wall portion including a pipeline formed to communicate with the second lumen and having a part of the outer surface in an inner surface of the pipeline.
1 . A medical catheter, comprising:
a multi-lumen tube including a first lumen and a second lumen;
an extension tube fixed to a first end surface in a longitudinal direction of the multi-lumen tube, extending from the first end surface along the longitudinal direction, and including a third lumen communicating with the first lumen; and
an outer wall portion extending from the multi-lumen tube along the extension tube and configured to cover a part of an outer surface of the extension tube, the outer wall portion including a pipeline formed to communicate with the second lumen and having a part of the outer surface in an inner surface of the pipeline: and
a balloon fixed to at least one of the multi-lumen tube, the extension tube, and the outer wall portion,
wherein the outer wall portion having second and third end surfaces each extending in the longitudinal direction and each directly contacting the outer surface of the extension tube,
an internal space of the balloon is formed to surround the extension tube and the internal space communicates with the second lumen through the pipeline, and
the balloon includes a proximal-end tail fixed to at least the outer wall portion, and a distal end of the outer wall portion is disposed at an inner side of the proximal-end tail.
2 . The medical catheter according to claim 1 , wherein the outer wall portion is formed of a same material as a side wall portion along the second lumen in the multi-lumen tube.
3 . The medical catheter according to claim 1 ,
wherein the first lumen and the third lumen are configured such that a guidewire is insertable through the first lumen or the third lumen, and
the second lumen is configured for introducing liquid for inflating the balloon into the internal space.
4 . The medical catheter according to claim 1 , wherein an outer diameter of the extension tube is equal to or larger than 0.4 times and equal to or less than 0.7 times of an outer diameter of the multi-lumen tube.
5 . The medical catheter according to claim 1 , wherein a joint portion of the end surface and the extension tube is disposed at the inner side of the proximal-end tail.
6 . The medical catheter according to claim 1 , wherein the outer wall portion is a plate-shaped protrusion having a substantial U-shaped cross section that is orthogonal to the longitudinal direction.
7 . The medical catheter according to claim 1 ,
wherein the extension tube includes an end portion facing the first end surface, and
a side surface of the end portion of the extension tube is in direct contact with lateral sides extending in the longitudinal direction on the second end surface of the outer wall portion.
8 . The medical catheter according to claim 1 , wherein a proximal-end surface of the extension tube comes into contact with the first end surface.
9 . The medical catheter according to claim 1 , wherein part of the extension tube is disposed so as to intrude into an inner side of the outer wall portion.
10 . The medical catheter according to claim 1 , wherein a proximal-end surface of the extension tube is configured to form a step portion which is in contact with the first end surface in a stepped shape.
11 . The medical catheter according to claim 1 , wherein a cross-sectional area orthogonal to the longitudinal direction in the second lumen at a distal-end side is smaller than that at a proximal-end side.
12 . The medical catheter according to claim 1 , wherein a cross section orthogonal to the longitudinal direction in the second lumen is in a crescent shape at least at a distal end side.
13 . The medical catheter according to claim 1 , wherein the pipeline is configured to eject liquid for inflating the balloon from the second lumen into the balloon to inflate the balloon.
14 . The medical catheter according to claim 1 , wherein a cross section orthogonal to the longitudinal direction in the second lumen is in an elliptic shape.