Elongated medical device, the elongated core, together defining a longitudinal axis and comprises a substantially and flat sheet formed into a tubular body that is disposed around at least a portion of said elongated core, said flat sheet length Ali, the thickness of the cross-section of the seat to change in the length direction of the sheet is. The tubular body has a proximal portion and a distal portion, the cross-sectional thickness of the sheet constituting the distal portion of the tubular body is thinner than the cross-sectional thickness of the sheet constituting the proximal portion of the tubular body. Preferably, the cross-sectional thickness of the sheet constituting the tubular body, which tapers toward the distal portion from the proximal portion. .BACKGROUND 2伸長型医療機器が、伸長芯と、長軸を規定するとともに前記伸長芯の少なくとも一部の周りに配置された管状体へと形成されるほぼ平坦なシートとを具え、前記平坦なシートは長さがあり、当該シートの断面の厚さは当該シートの長さ方向において変化する。管状体は近位部と遠位部を有し、当該管状体の遠位部を構成するシートの断面厚は、この管状体の近位部を構成するシートの断面厚より薄い。好適には、管状体を構成するシートの断面厚が、近位部から遠位部にかけて細くなっている。【選択図】図2
