| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a high-quality catheter with a laminated tube wall structure having a flexible resin layer and a rigid resin layer, whose principal tube is made of a flexible ultra-fine tube, with its inside and outside diameters being uniform throughout its length, which is suitable for medical treatment conditions in that both the compatibility of the flexibility and the rigidity of the principal tube and the fine adjustability in required mechanical properties are improved. <P>SOLUTION: The principal tube of this catheter comprises three layers; a rigid resin tube and a flexible resin tube, which form a gradually-varying laminated tube, and a lining tube applied to the inner surface thereof. The lining tube that is drawn is made different in hardness, by thermal treatment, along the longitudinal direction. <P>COPYRIGHT: (C)2004,JPO |
