Abstract: Provided is a plasma guide wire including a core shaft, a coil, a tip, a coil-core shaft joining region, and first to third insulating resin tubes. The first insulating resin tube is disposed on the outer periphery of the coil, and extends proximally from the tip to beyond the coil-core shaft joining region. The second insulating resin tube is disposed on the outer periphery of the core shaft, is joined to the proximal end of the first insulating resin tube, and extends from the proximal end of the first insulating resin tube to the proximal side of the core shaft. The second insulating resin tube is harder than the first insulating resin tube. The third insulating resin tube is disposed on at least a portion of a region of the inner periphery of the first insulating resin tube, proximal to a location facing the proximal end of the coil.

Abstract: A guide wire that includes a core shaft that is made of a first material, a coil that is provided to cover an outer periphery of the core shaft and is formed by twisting a first wire made of the first material and a plurality of second wires made of a second material different from the first material, and a distal end joint that joints a distal end of the core shaft and a distal end of the coil, and the distal end joint is made of the first material and is continuous from the distal end of the core shaft and the distal end of the first wire, and the distal end joint wraps the distal ends of the plurality of second wires.

Abstract: A guidewire has a distal-most end portion that retains its desired shape. The guidewire includes a first brazing member joining a distal end of a core shaft to a distal end of an outer coil, and a second brazing member provided adjacent to and on a proximal side of the first brazing member. The guidewire also includes an outer coil surrounding an outer periphery of the core shaft, and an inner coil provided between the outer coil and the core shaft. The second brazing member is provided between the outer coil and the inner coil, but is not provided between the inner coil and the core shaft. The melting point of the first brazing member is higher than the melting point of the second brazing member.

Abstract: A guide wire that includes a core shaft that is made of a first material, a coil that is provided to cover an outer periphery of the core shaft and is formed by twisting a first wire made of the first material and a plurality of second wires made of a second material different from the first material, and a distal end joint that joints a distal end of the core shaft and a distal end of the coil, and the distal end joint is made of the first material and is continuous from the distal end of the core shaft and the distal end of the first wire, and the distal end joint wraps the distal ends of the plurality of second wires.

Abstract: Provided is a plasma guide wire including a core shaft, a coil, a tip, a coil-core shaft joining region, and first to third insulating resin tubes. The first insulating resin tube is disposed on the outer periphery of the coil, and extends proximally from the tip to beyond the coil-core shaft joining region. The second insulating resin tube is disposed on the outer periphery of the core shaft, is joined to the proximal end of the first insulating resin tube, and extends from the proximal end of the first insulating resin tube to the proximal side of the core shaft. The second insulating resin tube is harder than the first insulating resin tube. The third insulating resin tube is disposed on at least a portion of a region of the inner periphery of the first insulating resin tube, proximal to a location facing the proximal end of the coil.

Abstract: A guidewire has a distal-most end portion that retains its desired shape. The guidewire includes a first brazing member joining a distal end of a core shaft to a distal end of an outer coil, and a second brazing member provided adjacent to and on a proximal side of the first brazing member. The guidewire also includes an outer coil surrounding an outer periphery of the core shaft, and an inner coil provided between the outer coil and the core shaft. The second brazing member is provided between the outer coil and the inner coil, but is not provided between the inner coil and the core shaft. The melting point of the first brazing member is higher than the melting point of the second brazing member.

Abstract: A guidewire has a distal-most end portion that retains its desired shape. The guidewire includes a first brazing member joining a distal end of a core shaft to a distal end of an outer coil, and a second brazing member provided adjacent to and on a proximal side of the first brazing member. The melting point of the first brazing member is higher than the melting point of the second brazing member. As a result, deformation of the first brazing member due to a heat produced during formation of the second brazing member is prevented or minimized.

Abstract: A guidewire is capable of pressing against a lesion without bending excessively, thereby ensuring reliable use. The guidewire includes a shaft, an outer coil provided around a distal portion of the shaft, a first inner coil provided within a distal portion of the outer coil, and a second inner coil provided proximal to the first inner coil within the outer coil. A first joining member joins the shaft to a proximal end of the first inner coil, or a proximal portion of the first inner coil distal to the proximal end of the first inner coil. A second joining member joins the shaft to a distal end of the second inner coil, or a distal portion of the second inner coil proximal to the distal end of the second inner coil. The first joining member and the second joining member are spaced from each other in a longitudinal direction of the guidewire.

Abstract: A guidewire includes a shaft, an outer coil wound around a distal end portion of the shaft, and an inner coil provided within the outer coil. The outer coil is formed by winding a plurality of stranded wires in a spiral manner, each of the stranded wires being formed of a plurality of elemental wires twisted together, and the direction of winding of the outer coil is opposite to the direction of winding of the inner coil.

Abstract: A stranded wire whose deformation or breakage is suppressed so that sufficient safety is ensured, and a guidewire employing the stranded wire. The stranded wire includes a core element wire and side element wires wound so as to cover a circumference of the core element wire, the core element wire and the side element wires being stranded together. The side element wires include at least a pair of first side element wires arranged point-symmetrically around the core element wire, and a second side element wire having a tensile strength lower than a tensile strength of the core element wire and a tensile strength of the first side element wires.

Abstract: A coil-type guidewire includes a core shaft, a coil body, and a plurality of bonding portions that bond the core shaft and the coil body to each other. At least one loosely wound coil portion is provided in at least one of regions bounded by the bonding portions, and densely wound coil portions are disposed near the bonding portions.

Abstract: A guidewire includes a core shaft, and a coiled body wound around the outer circumferential surface of the core shaft. A bulged portion is provided at the tip portion of the core shaft. The front end of the coiled body is bonded to the front end of the core shaft with a bonding portion. The bonding portion is provided to enclose the bulged portion provided at the tip portion of the core shaft.

Abstract: A guidewire includes a core shaft, a coil body that covers the core shaft, and a joining portion formed of metal solder that couples the core shaft and the coil body. The coil body includes a tungsten wire and a noble metal plating layer that covers at least a portion of a surface of the tungsten wire. A surface of the noble metal plating layer has a first uneven shape, including at least one recess and at least one protrusion.

Abstract: A guidewire includes a core shaft, a coil body that covers the core shaft, and a joining portion formed of metal solder that couples the core shaft and the coil body. The coil body includes a tungsten wire and a noble metal plating layer that covers at least a portion of a surface of the tungsten wire. A surface of the noble metal plating layer has a first uneven shape, including at least one recess and at least one protrusion.

Abstract: A guidewire includes a core shaft, and a coiled body wound around the outer circumferential surface of the core shaft. A bulged portion is provided at the tip portion of the core shaft. The front end of the coiled body is bonded to the front end of the core shaft with a bonding portion. The bonding portion is provided to enclose the bulged portion provided at the tip portion of the core shaft.

Abstract: A medical guide wire 1 has a front helical spring 4 which is formed by two stranded wire units 41, 42 in a helically-wired spring configuration in which the two stranded wire units 41, 42 are further twisted in a helically-wired multiple spring configuration. This imparts an increased flexibility to the front helical spring 4, compared to the case in which a front helical spring is formed by a single wire to be diametrically identical to the front helical spring 4. With the favorable flexibility and sufficient torque-transmissibility, it is possible to reduce a risk of having a damage on a blood vessel upon inserting the medical guide wire 1 into the blood vessel.

Abstract: A steel having good wear resistance which contains 0.55-1.10% of C, up to 2.0% of Si, up to 2.0% of Mn, 12.0-25.0% of Cr and particularly suitable as a material for piston rings or rocker arms. Further addition of 0.05-1.10% of Al to the above steel gives a steel improved in properties for spheroidization of carbides and uniformization of carbide particle size, leading to further enhancement of wear resistance. If required 0.20-2.0% of Ni may be added to the steels, whereby corrosion resistance, toughness and hardenability are improved. An addition of at least one of 0.2-3.0% of Mo, 0.1-1.5% of V and 0.05-0.70% of Nb to the steels improves high-temperature strength and surface hardness. The steel is surface treated by gas nitriding of the like in a surface area for sliding contact with an opponent member.

Abstract: A steel having good wear resistance which contains 0.55-1.10% of C, up to 2.0% of Si, up to 2.0% of Mn, 12.0-25.0% of Cr and particularly suitable as a material for piston rings or rocker arms. Further addition of 0.05-1.10% of Al to the above steel gives a steel improved in properties for spheroidization of carbides and uniformization of carbide particle size, leading to further enhancement of wear resistance. If required 0.20-2.0% of Ni may be added to the steels, whereby corrosion resistance, toughness and hardenability are improved. An addition of at least one of 0.2-3.0% of Mo, 0.1-1.5% of V and 0.05-0.70% of Nb to the steels improves high-temperature strength and surface hardness. The steel is surface treated by gas nitriding of the like in a surface area for sliding contact with an opponent member.