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° C.) in an outer diametrical direction of preferably 0.5×10 -4 to 5.0×10 -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.
A guide wire for MRI comprising a contrast portion generating an artifact one to eight times an actual diameter of an MRI image photographed by a gradient echo method, said contrast portion having an organic coating layer of 0.05 mm-0.3 mm thickness coating at least a part of said contrast portion.
Claim 2
Dependent Claim
51 words
A guide wire for MRI comprising a contrast portion generating an artifact one to eight times an actual diameter of an MRI image photographed by a gradient echo method, said contrast portion having an organic coating layer of 0.05 mm-0.3 mm thickness coating at least a part of said contrast portion.
Claim 3
Dependent Claim
25 words
A guide wire as recited in claim 1, wherein said contrast portion is present in at least a front end portion of the guide wire.
Claim 4
Dependent Claim
35 words
A guide wire as recited in claim 1, wherein said contrast portion is made of an alloy containing a nickel of 40 wt % or more and an iron of 7 wt % or less.
Claim 5
Dependent Claim
18 words
A guide wire as recited in claim 3, wherein said alloy further contains a chrome and a molybdenum.
Claim 6
Dependent Claim
45 words
A guide wire as recited in claim 4, wherein said alloy contains a nickel of 45 wt % or more, an iron of 2 to 7 wt %, a chrome of 10 to 25 wt % and a molybdenum of 10 to 20 wt %.
Claim 7
Dependent Claim
19 words
A guide wire as recited in claim 1, wherein said coating layer is constituted by an organic polymeric layer.
Claim 8
Dependent Claim
39 words
A guide wire as recited in claim 1, including a core member constituted by a metal material having a magnetic susceptibility of 0.5×10 -4 to 5.0×10 -4 in an outer diametrical direction at a temperature close to room temperature.