| 摘要 |
<p>A catheter tube for medical treatment having a high degree of freedom in having its rigidity and flexibility changed stepwise and enabling the setting of a bending rigidity changing position according to a variety of access routes and a method of manufacturing the catheter tube. The catheter tube comprises an inner layer tube, a reinforcement material layer, a marker, and an outer layer tube which are formed integrally with each other. The catheter tube is so formed that a line body forming the reinforcement material layer is densely wound at its tip part, the marker formed of an X-ray impermeable metal wire adjacent to the tip thereof is also densely wound, and comprises a leading-edge part where the reinforcement material layer and the marker are not present. Accordingly, the bending rigidity of the catheter tube from the base part to ward the tip part is stepwise or continuously decreased by the presence of the reinforcement material layer and the outer layer tube. The winding of the line body is terminated at the base part after its interval and tilt angle are changed at positions between the densely wound portion of the tip part and a portion near the base part, and the outer layer tube has a stepwise-changing hardness arrangement. As a result, the catheter tube can be set to a variety of bending rigidity changing positions.</p> |
