| 摘要 |
PROBLEM TO BE SOLVED: To suppress the wear of a casting mold and arbor and to necessitate the mere exchange of only a worn tool in spite of wearing by mounting a tubular catheter at this arbor, mounting the arbor at the heated casting mold, molding the catheter, inserting the finned catheter into a jig and cutting fins. SOLUTION: The tubular catheter 1 consisting of polytetrafluoroethylene, etc., is mounted at the coaxial arbor 2. The arbor 2 is inserted to the inner side of the bore 3 of a catheter cannula and is put into the state of extending beyond the catheter end 5. The casting mold 6 having a convergent inner flank 7 is heated to a suitable temp. and the catheter 1 and the arbor 2 are inserted into the casting mold. The catheter 1 is then softened and molded. As a result, the front end 8 of the fin is formed at the catheter 1. The casting mold 6 and the catheter 1 are cooled and the finned catheter 1 is removed. The fin 8 is cut off by a definning jig, by which the desired venous catheter is obtd. As a result, the casting mold and arbor are not used as cutting tools and, therefore, the wear thereof is suppressed. |
