Guide wire
A guide wire includes a first core shaft, a second core shaft, and a covering portion. The second core shaft is made of a material more susceptible to plastic deformation than a material of the first core shaft, and has a proximal end side joined to a distal end side of the first core shaft. The covering portion covers (i) a joint part between the first and second core shafts, and (ii) at least a part of the second core shaft on a distal end side of the joint part. The guide wire includes a first region where the second core shaft on a distal end side of the joint part is covered by the covering portion, and a second region adjacent to the first region, where the joint part is covered by the covering portion. The first region is more susceptible to plastic deformation than the second region.
1 . A guide wire comprising:
a first core shaft made of a superelastic material and having a small-diameter portion, a decreasing-diameter portion in which an outer diameter of the first core shaft decreases in a distal direction, and a large-diameter portion, in this order from a distal end side of the first core shaft to a proximal end side of the first core shaft;
a second core shaft made of a material more susceptible to plastic deformation than the superelastic material of the first core shaft and having a proximal end side laterally joined to the small-diameter portion of the first core shaft;
a covering portion covering (i) a joint part between the first core shaft and the second core shaft and (ii) at least a part of the second core shaft that is on a distal end side of the joint part;
a distal end-side fixation portion fixed to a distal end portion of the second core shaft and a distal end portion of the covering portion; and
a coil body covering the second core shaft and the covering portion,
wherein:
the guide wire includes, from a distal end side of the guide wire toward a proximal end side of the guide wire:
a first region where the second core shaft on a distal end side of the joint part is covered by the covering portion, and
a second region adjacent to the first region, where the joint part is covered by the covering portion,
the first region is more susceptible to plastic deformation than the second region;
the covering portion is configured to be less susceptible to plastic deformation than the second core shaft and more susceptible to plastic deformation than the first core shaft, and
the distal end portion of the covering portion is fixed to the second core shaft by the distal end-side fixation portion, and a proximal end portion of the covering portion is not fixed to the first core shaft.
2 . The guide wire according to claim 1 , further including:
a distal end region disposed on a distal end side of the first region, and where the second core shaft is exposed from the covering portion,
wherein the distal end region is more susceptible to plastic deformation than the first region.
3 . The guide wire according to claim 1 , further including:
a third region disposed on a proximal end side of the second region, and where the first core shaft is covered by the covering portion,
wherein:
the covering portion further covers at least a part of the first core shaft that is on a proximal end side of the joint part, and
the third region is less susceptible to plastic deformation than the second region.
4 . The guide wire according to claim 3 , further including:
a fourth region disposed on a proximal end side of the third region, and where the first core shaft is exposed from the covering portion,
wherein the fourth region is less susceptible to plastic deformation than the third region.
5 . The guide wire according to claim 1 , wherein:
in the joint part, a transverse sectional shape of the first core shaft is different from a transverse sectional shape of the second core shaft.
6 . The guide wire according to claim 1 , wherein:
the first core shaft in the joint part has a substantially rectangular transverse sectional shape, and
the second core shaft in the joint part has a substantially elliptical transverse sectional shape.
7 . The guide wire according to claim 1 , wherein the joint part is disposed at the decreasing-diameter portion.
8 . The guide wire according to claim 2 , further including:
a third region disposed on a proximal end side of the second region, and where the first core shaft is covered by the covering portion,
wherein:
the covering portion further covers at least a part of the first core shaft that is on a proximal end side of the joint part, and
the third region is less susceptible to plastic deformation than the second region.
9 . The guide wire according to claim 8 , further including:
a fourth region disposed on a proximal end side of the third region, and where the first core shaft is exposed from the covering portion,
wherein the fourth region is less susceptible to plastic deformation than the third region.
10 . The guide wire according to claim 2 , wherein:
in the joint part, a transverse sectional shape of the first core shaft is different from a transverse sectional shape of the second core shaft.
11 . The guide wire according to claim 2 , wherein:
the first core shaft in the joint part has a substantially rectangular transverse sectional shape, and
the second core shaft in the joint part has a substantially elliptical transverse sectional shape.
12 . The guide wire according to claim 2 , wherein the joint part is disposed at the decreasing-diameter portion.
13 . The guide wire according to claim 3 , wherein:
in the joint part, a transverse sectional shape of the first core shaft is different from a transverse sectional shape of the second core shaft.
14 . The guide wire according to claim 1 , wherein a proximal end of the covering portion is located in a middle region of the decreasing-diameter portion.
15 . A guide wire comprising:
a first core shaft made of a superelastic material and having a small-diameter portion, a decreasing-diameter portion in which an outer diameter of the first core shaft decreases in a distal direction, and a large-diameter portion, in this order from a distal end side of the first core shaft to a proximal end side of the first core shaft;
a second core shaft made of a material more susceptible to plastic deformation than the superelastic material of the first core shaft and having a proximal end side laterally joined to the small-diameter portion of the first core shaft;
a covering portion covering (i) a joint part between the first core shaft and the second core shaft and (ii) at least a part of the second core shaft that is on a distal end side of the joint part;
a distal end-side fixation portion fixed to a distal end portion of the second core shaft and a distal end portion of the covering portion; and
a coil body covering the second core shaft and the covering portion,
wherein:
the guide wire includes, from a distal end side of the guide wire toward a proximal end side of the guide wire:
a first region where the second core shaft on a distal end side of the joint part is covered by the covering portion, and
a second region adjacent to the first region, where the joint part is covered by the covering portion,
the first region is more susceptible to plastic deformation than the second region;
in each section where the coil body covers the covering portion, the coil body contacts only the distal end-side fixation portion, and
the distal end portion of the covering portion is fixed to the second core shaft by the distal end-side fixation portion, and a proximal end portion of the covering portion is not fixed to the first core shaft.
16 . A guide wire comprising:
a core shaft having a first core shaft and a second core shaft;
the first core shaft having a small-diameter portion, a decreasing-diameter portion in which an outer diameter of the first core shaft decreases in a distal direction, and a large-diameter portion, in this order from a distal end side of the first core shaft to a proximal end side of the first core shaft;
a joint part that contacts a distal end of the first core shaft and a proximal end of the second core shaft;
a covering portion covering (i) the joint part and (ii) at least a part of the second core shaft that is on a distal end side of the joint part;
a distal end-side fixation portion fixed to a distal end portion of the second core shaft and a distal end portion of the covering portion; and
a coil body covering the second core shaft and the covering portion, wherein
the guide wire includes, from a distal end side of the guide wire toward a proximal end side of the guide wire:
a first region where the second core shaft on the distal end side of the joint part is covered by the covering portion, and
a second region adjacent to the first region, where the joint part is covered by the covering portion,
in each section where the coil body covers the covering portion, the coil body contacts only the distal end-side fixation portion, and
the distal end portion of the covering portion is fixed to the second core shaft by the distal end-side fixation portion, and a proximal end portion of the covering portion is not fixed to the first core shaft.
17 . The guide wire according to claim 16 , wherein the second core shaft has a proximal end side laterally joined to the small-diameter portion of the first core shaft.
18 . The guide wire according to claim 16 , wherein the first region is more susceptible to plastic deformation than the second region.
19 . The guide wire according to claim 16 , wherein the outer diameter of the distal end-side fixation portion is greater than the outer diameter of the covering portion.
20 . The guide wire according to claim 16 , wherein a maximum outer diameter of the second core shaft is greater than the outer diameter of the covering portion.
21 . The guide wire according to claim 16 , wherein the proximal end portion of the covering portion is not fixed.