Abstract: A stent includes a cylindrical main body portion, a linkage portion, and a marker attachment portion. The main body portion extends in an axial direction. The linkage portion extends from an end of the main body portion in the axial direction. The marker attachment portion is linked to the main body portion through the linkage portion. The linkage portion includes a bent portion tilting the marker attachment portion outward in a radial direction of the main body portion.

Abstract: A balloon catheter includes an outer shaft, an inner shaft, and an inflatable balloon. The inner shaft is inserted inside the outer shaft. A part of the inner shaft extends from a leading end of the outer shaft. The balloon includes a base end side joint portion joined to the outer shaft and a leading end side joint portion joined to the inner shaft. The inner shaft has an extension portion configured to in an axial line direction. The extension portion is provided further to a base end side than the leading end side joint portion.

Abstract: A guide wire port is formed in a midway position, in an axial line direction, of an outer shaft. A core wire extending across the guide wire port is provided in an outer tube hole of the outer shaft. The core wire has a leading end side area positioned further to a leading end side than the guide wire port and a tapered area provided on a base end side of the leading end side area. The tapered area has a first tapered area including a same position as the guide wire port in the axial line direction and a second tapered area provided continuously from a base end side of the first tapered area. A rate of increase of a transverse cross-sectional area from the leading end side toward the base end side is larger in the first tapered area than in the second tapered area.

Abstract: Provided is a catheter assembly that can increase the degree of freedom for selecting a guide wire to be used. The catheter assembly includes an outer catheter and an inner catheter. The outer catheter is a catheter for introducing a balloon catheter or the like to an affected area and the inner catheter is an insertion-assisting tool that assists insertion by preceding the insertion of the outer catheter when being inserted in a human body. An inner opening by which a guide wire tube hole of the inner catheter is opened at a proximal end side and an outer opening by which the outer tube hole of the outer catheter is opened at a proximal end side are formed at the middle position in the axial line direction, and the openings are formed at an angle with respect to the axial line directions at positions on the same line.

Abstract: An insertion assisting tool inserted into a catheter and positioned ahead of the catheter is provided so as to assist an insertion of the catheter. The insertion assisting tool includes: a distal end portion whose end is tapered and which has a guide wire lumen opening at a tip end and a proximal end of the distal end portion; and a shaft extending from a part of a proximal-end surface of the distal end portion to a proximal end of the insertion assisting tool.

Abstract: Along with a reduction in the resistance of a catheter in passing through a valve in an catheter introducer, the hemostatic effect is improved. A main body of the valve is made of a 3-layer structure, and both front and back layers are provided with narrow slits B, B having a crossing at the center, and the interlayer is provided with narrow slit B having a cut closed by contact with the tip of flap 8 protruded from both sides, where the narrow slit in the interlayer is provided as a penetration hole having a round section with the outer periphery in contact with both the sides of the interlayer and in a perpendicular direction to the narrow slits B, B in the back and front layers, as shown in FIG. 8.