| 摘要 |
PURPOSE:To provide a balloon catheter for expanding the celom capable of easily and exactly progressing the balloon membrane of the balloon catheter down into the constricted part position of the celom and effectively exhibiting the celom expanding function of the balloon catheter even if the constricted part formed in the celom, such as blood vessel, is narrow, is hard, is eccentric or meanders. CONSTITUTION:The outside diameter at the front end 7 of the cylindrical balloon membrane 4 and the outside diameter in the central part 22 thereof, which are respectively defined as RS and R1, and the film thicknesses at the front end 7 and central part 22 of the cylindrical balloon membrane 4, which are respectively defined as tS and t1, are so set that the relation therebetween satisfies an equation R1Xt1-t1<2>>=0.9X(RSXtS-tS<2>). Production of the balloon membrane 4 satisfying such relation is executed by first preparing a tubular parison which is larger in the film thickness in the central part than the film thickness at both ends. This parison is then subjected to blow molding. |
