In the method of manufacturing the dilation tube and the puncture portion thereof, the dilation tube extends in the front-rear direction and includes a tube body portion and a puncture portion, the puncture portion is disposed at the front end of the tube body portion, and the puncture portion is front to back in the front-rear direction The first rigid layer, the second rigid layer and the third rigid layer are connected, and the third rigid layer is connected to the front end of the tubular body portion, and sequentially connects the second and first rigid layers forward, and the third rigid layer The hardness is greater than the hardness of the second rigid layer, and the hardness of the second rigid layer is greater than the hardness of the first rigid layer. Since the hardness of the rigid layer of the present invention is gradually strengthened from front to back, the present invention can be concentrated in the puncture. The strength of the puncture, and the lower hardness of the first rigid layer can reduce the possibility of stabbing blood vessels during the end puncture.本創作係擴張管及其穿刺部的製造方法，擴張管沿前後方向延伸，並包含有管體部及穿刺部，穿刺部設置於管體部的前端，並穿刺部沿前後方向由前至後包含有一第一剛性層、一第二剛性層及一第三剛性層，第三剛性層連接管體部的前端，並依序向前連接第二及第一剛性層，且第三剛性層的硬度大於第二剛性層的硬度，第二剛性層的硬度大於第一剛性層的硬度，由於本創作的剛性層之硬度係由前至後逐漸加強，使本創作在穿刺時，可較為集中其穿刺的力量，且硬度較低的第一剛性層可降低其端部穿刺過程中刺傷血管的可能。
