| 摘要 |
<p>Provided is a double-tube structure balloon catheter, having an outer tube (10), and an inner tube (30), wherein the inner tube (30) is attached to the inner wall of the outer tube (10) at a site away from the rear end of a balloon (20) toward the base end side thereof. With the diameter of the balloon (20) in mm designated D, the length of the balloon (20) in mm designated L, and the distance from the rear end of the balloon (20) to the attachment site of the inner tube (30) in mm designated G, either formula 1A, G≥45(L/D)−292 (where L/D≤8.0), or formula 1B, G≥70(L/D)−495 (where L/D≥8.0), and formula 2, 30≤G≤150, are satisfied. With this balloon catheter, it is possible to alleviate to a degree the relative misalignment between the outer tube and the inner tube, and it is also possible to maintain the linearity of the balloon shape even if high pressure is applied to the interior of the balloon.</p> |
