| CPC A61B 18/1492 (2013.01) [A61B 18/1477 (2013.01); A61B 2018/00077 (2013.01); A61B 2018/00083 (2013.01); A61B 2018/0022 (2013.01); A61B 2018/00577 (2013.01); A61B 2018/00744 (2013.01); A61B 2018/1467 (2013.01); A61B 2562/0271 (2013.01)] | 10 Claims |
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1. A balloon-type electrode catheter for performing a high frequency ablation treatment, the balloon-type electrode catheter comprising :
an outer tube that has a center lumen and a plurality of sub lumens that are disposed around the center lumen;
an energization connector that is disposed on a proximal end side of the outer tube;
a balloon that has an expansion portion that expands and contracts and a proximal-end-side neck portion and a distal-end-side neck portion, wherein the proximal-end-side neck portion is continuous with an end of the expansion portion and the distal-end-side neck portion is continuous with another end of the expansion portion, the balloon being connected to a distal end side of the outer tube as a result of the proximal-end-side neck portion being fixed to a distal end portion of the outer tube and the expansion portion containing the distal end portion of the outer tube;
an inner shaft that is inserted into the center lumen of the outer tube, the inner shaft extending out through an opening of the center lumen into an inner portion of the balloon, being fixed to the distal-end-side neck portion of the balloon, and extending out to an outside of the balloon;
a surface electrode that is formed by a metal thin film that is formed on an outer surface of the balloon at at least the expansion portion of the balloon; and
a conducting wire that electrically connects the surface electrode and the energization connector to each other,
wherein at least one of the sub lumens of the outer tube is a fluid supply sub lumen in which a fluid, including physiological saline solution, is caused to flow to supply the fluid into the inner portion of the balloon,
wherein at least one of the sub lumens of the outer tube is a fluid drainage sub lumen in which the fluid is caused to flow to drain the fluid supplied into the inner portion of the balloon, from the inner portion of the balloon,
wherein an opening of either one of the fluid supply sub lumen and the fluid drainage sub lumen is located on a distal end side further from an intermediate location in an axial direction in the expansion portion,
wherein an opening of the other of the fluid supply sub lumen and the fluid drainage sub lumen is located at a proximal end of the expansion portion or in a vicinity thereof,
wherein the opening of the fluid supply sub lumen is located on the distal end side from the intermediate location in the axial direction in the expansion portion,
wherein the opening of the fluid drainage sub lumen is located at the proximal end of the expansion portion or in a vicinity thereof,
wherein the outer tube is formed by
a circular tubular part that extends in a proximal end direction from the proximal end of the expansion portion or a location in a vicinity thereof, and
a semicircular tubular part that extends in a distal end direction from the proximal end of the expansion portion or a location in the vicinity thereof in an inner portion of the expansion portion beyond the intermediate location in the axial direction in the expansion portion,
wherein the fluid supply sub lumen is disposed in inner portions of the circular tubular part and the semicircular tubular part and opens in a distal end surface of the semicircular tubular part, and
wherein the fluid drainage sub lumen is disposed in the inner portion of the circular tubular part and opens in a distal end surface of the circular tubular part.
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