Abstract: A blood vessel embolization method includes inserting a balloon catheter into a blood vessel of a human or an animal having a lesion site and disposing a balloon of the balloon catheter at a portion located at a proximal side of the blood vessel and in a neighborhood of the lesion site thereof; shutting off a blood flow in the blood vessel by expanding the balloon; discharging a glucose solution from a distal end of the balloon catheter in a state in which the blood flow in the blood vessel is shut off; discharging a cyanoacrylate-based embolization substance-containing liquid from the distal end of the balloon catheter after the glucose solution injection step; hardening an embolization substance by maintaining a blood flow shut-off state of the blood vessel after the embolization substance injection step; and removing the balloon catheter from the blood vessel after the embolization substance-hardening step.

Abstract: A guide wire (1A) shown in FIG. 1 of an Embodiment of the present invention is constituted by a core member (2) and a coil (3) wound around an outer periphery of the core member (2) all around the length of the core member (2). Stopper members (4) and (5) are provided in both ends of the core member (2), respectively. At least either of the core member (2) and the coil (3), thin film thereon, or a thin plate placed thereon is constituted by an alloy containing a nickel of 45 wt % or more, an iron of 3 to 6 wt %, a chrome of 10 to 25 wt % and a molybdenum of 10 to 20 wt %, or a metal material having a magnetic susceptibility at a temperature close to a room temperature (about 10 to 40.degree. C.) in an outer diametrical direction of preferably 0.5.times.10.sup.-4 to 5.0.times.10.sup.-4. The guide wire (1A) of this kind generates an artifact 1 to 7 times an actual outer diameter on an MRI image photographed by a gradient echo method, thereby suitably recognized in a monitor image by the MRI.

Abstract: A blood vessel piercing instrument includes an outer tube assembly and an inner needle assembly. The outer tube assembly has an outer tube and an outer tube hub attached to the rear end portion of said outer tube. The outer tube has a metal tubular member made of a superelastic metal and a resin tubular member which covers the outside surface of the metal tubular member and has the front end portion extending beyond the front end of the metal tubular member. The inner needle assembly includes an inner needle which is extractably inserted in said outer tube assembly and has a piercing edged surface formed at the front end protruding from said outer tube and an inner needle hub which is attached to the rear end portion of said inner needle and engages with the rear end of said outer tube hub. An inside diameter of said front end portion of said resin tubular member is smaller than the inside diameter of said metal tubular member and substantially equal to an outside diameter of said inner needle.