Balloon catheter

Abstract

To provide a balloon catheter that possesses desired pushability and pressure resistance, while also having improved passability. [Solution] In the inner shaft 120 of the tip shaft 110 of the balloon catheter 10, in at least a portion of the part that overlaps with the balloon 300 in the axial direction, in a cross-sectional area perpendicular to the axis of the shaft portion 100, the cross-sectional space occupancy rate of the tube wall portion of the inner shaft is 30% or more and 40% or less of the total cross-sectional area including the outer circumference of the inner shaft 120, and in a predetermined range on the tip side of the guide wire port 123a, the three-point bending load per unit deflection is 0.10 N / mm or more and 0.25 N / mm or less.

Claims

1. A balloon catheter comprising a shaft portion and a balloon positioned at the tip of the shaft portion, The aforementioned shaft portion is The tip shaft is configured to include an inner shaft having a guidewire lumen through which a guidewire can be inserted and a guidewire port located at the base end of the guidewire lumen, and an outer shaft positioned between the inner shaft and the fluid lumen through which fluid for expanding the balloon can flow, In at least a portion of the inner shaft that overlaps with the balloon in the axial direction, in a cross-sectional area perpendicular to the axis of the shaft portion, the cross-sectional space occupancy rate of the tube wall portion of the inner shaft relative to the total cross-sectional area including the outer circumference of the inner shaft is 30% or more and 40% or less. The tip shaft of the balloon catheter has a three-point bending load per unit deflection of 0.10 N / mm or more and 0.25 N / mm or less in a predetermined range on the tip side of the guide wire port.

2. The inner shaft has a tip region positioned to overlap with the balloon in the axial direction, and a base region positioned closer to the base than the tip region and having a larger outer diameter than the tip region. The tip and base of the balloon are positioned to overlap in the axial direction with the tip region of the inner shaft. The balloon catheter according to claim 1, wherein the tip shaft has a three-point bending load per unit deflection of 0.10 N / mm or more and 0.25 N / mm or less in the range on the proximal end side of the position where it overlaps with the proximal end of the balloon in the axial direction, and in the proximal end region, at least in the tip region.

3. The shaft portion has a core wire that reinforces it, At least a portion of the core wire is arranged to overlap the base end region in the axial direction, The balloon catheter according to claim 2, wherein the tip shaft has a three-point bending load per unit deflection of 0.10 N / mm or more and 0.25 N / mm or less from a position where it overlaps axially with the proximal end of the balloon in at least the tip region to the tip of the core wire.

4. The balloon catheter according to claim 2 or 3, wherein the axial length of the tip region of the inner shaft is longer than the axial length of the proximal region.

5. The balloon catheter according to claim 2 or 3, wherein the axial length of the proximal region of the inner shaft is longer than the axial length of the tip region.

6. The balloon catheter according to claim 2, wherein, in a cross-sectional area perpendicular to the axis of the shaft portion, the cross-sectional space occupancy rate of the tube wall portion of the proximal end region of the inner shaft relative to the cross-sectional area of ​​the lumen of the outer shaft is 22% or more and 34% or less.

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