Balloon catheter

Abstract

The present invention provides a balloon catheter that can improve kink resistance, fluid flow, and resistance to bending while suppressing an increase in the diameter of the proximal shaft. [Solution] The balloon catheter 10 comprises a shaft portion 100 and a balloon 300 positioned at the tip of the shaft portion. The shaft portion includes a tip shaft 110 having a guidewire lumen 125 through which a guidewire GW can be inserted, a guidewire port 123a positioned at the proximal end of the guidewire lumen, and a first fluid lumen 135 through which fluid for expanding the balloon can flow. The proximal shaft 150 has a second fluid lumen 155 communicating with the first fluid lumen, is positioned on the proximal end side of the guidewire port, and extends to the proximal end of the shaft portion. The proximal shaft has a Vickers hardness of 350 HV or more and 380 HV 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 A tip shaft comprising a guidewire lumen through which a guidewire can be inserted, a guidewire port located at the base end of the guidewire lumen, and a first fluid lumen through which fluid for expanding the balloon can flow, It comprises a second fluid lumen communicating with the first fluid lumen, and a base shaft positioned on the base end side of the guide wire port and extending to the base end of the shaft portion, The aforementioned proximal shaft is a balloon catheter having a Vickers hardness of 350 HV or more and 380 HV or less.

2. The second moment of area of ​​the base shaft is 0.0145 mm ４ The above is 0.0160 mm ４ The balloon catheter according to claim 1, which is as follows:

3. The balloon catheter according to claim 1, wherein, after inserting the proximal shaft into a substantially annular test tube in a plan view for 1 second or more, and then removing the proximal shaft from the test tube, the bending angle formed by the proximal shaft is 90° or less.

4. The balloon catheter according to claim 1, wherein the proximal shaft has a bending strength of 691 gf or more and 819 gf or less.

5. The inner diameter of the base shaft is 0.56 mm or more and 0.71 mm or less. The balloon catheter according to claim 1, wherein the outer diameter of the proximal shaft is 0.80 mm or more and 0.90 mm or less.

6. A balloon catheter comprising a shaft portion and a balloon positioned at the tip of the shaft portion, The aforementioned shaft portion is A tip shaft comprising a guidewire lumen through which a guidewire can be inserted, a guidewire port located at the base end of the guidewire lumen, and a first fluid lumen through which fluid for expanding the balloon can flow, It comprises a second fluid lumen communicating with the first fluid lumen, and a base shaft positioned on the base end side of the guide wire port and extending to the base end of the shaft portion, The base shaft has a bending strength of 691 gf or more and 819 gf or less. A balloon catheter in which, with both axial ends of the proximal shaft fixed to fixing fixtures, the distance between the fixing fixtures is gradually reduced from a state where the distance between the fixing fixtures is 100 mm, and the load displacement is measured by autograph while pushing at a speed of 400 mm / second, and the kink distance is defined based on the measured load displacement, the kink distance is 40 mm or more and 85 mm or less.

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