Electric wire connection structure, electric wire connection method, medical device, and method for manufacturing the same

1. An electric wire connection structure, comprising:

insulated electric wires each including a core and an insulation coating covering the core, the cores of the insulated electric wires being connected to pads provided on a substrate,

wherein the insulated electric wires are arranged with an interval that is less than an outer diameter of the insulated electric wire along a predetermined alignment direction and arranged parallel to each other,

wherein the insulation coating is removed at a part in a longitudinal direction of each of the insulated electric wires to expose the core, and exposed portions of the cores are connected to the pads, respectively,

wherein the exposed portion of the core is formed in an area except a tip end of each of the insulated electric wires,

wherein at least one of the insulated electric wires is configured in such a manner that the core is exposed in an area where the insulation coatings of adjacent ones of other insulated electric wires in the alignment direction are not removed.

2. The electric wire connection structure according to claim 1 , wherein a space is formed between the insulated electric wires.

3. The electric wire connection structure according to claim 2 , wherein an outer diameter of the core is 0.1 mm or less.

4. The electric wire connection structure according to claim 1 , wherein the exposed portions of the cores are alternately aligned at a first position and a second position, with a predetermined interval in a direction perpendicular to the alignment direction.

5. A medical device, comprising:

a catheter cable comprising insulated electric wires each including a core and an insulation coating covering the core, and a substrate including pads connected to the cores of the insulated electric wires, one of both ends in a longitudinal direction of the catheter cable being configured to be inserted into a human body,

wherein the cores of the insulated electric wires are connected to the pads respectively by the electric wire connection structure according to claim 1 .

6. The electric wire connection structure according to claim 1 , wherein the interval of the insulated electric wires in the alignment direction is 20% or more and 80% or less of the outer diameter of the insulated electric wire.

7. An electrical wire connection method for connecting cores of insulated electric wires each including the core and an insulation coating covering the core with pads provided on a substrate, the method comprising:

holding the insulated electric wires at a point at a tip end in the longitudinal direction and a point distant from the tip end in the longitudinal direction, and aligning the insulated electric wires parallel to each other with an interval that is less than an outer diameter of the insulated electric wire along a predetermined alignment direction;

removing the insulation coating to expose the core in a part in a longitudinal direction of each of the insulated electric wires; and

arranging the insulated electric wires in such a manner that the alignment direction is parallel to the substrate and connecting the exposed cores to the pads, and connecting the cores of the insulated electric wires to the pads respectively, while a longitudinal tension is applied to the insulated electric wires,

wherein at least one of the insulated electric wires is configured in such a manner that the core is exposed in an area where the insulation coatings of adjacent ones of other insulated electric wires in the alignment direction are not removed, and

wherein, in the connecting, the cores of the insulated electric wires are connected to the pads respectively between the first point and the second point.

8. A method for manufacturing a medical device including a catheter cable including insulated electric wires each including a core and an insulation coating covering the core, and a substrate including pads connected to the cores of the insulated electric wires, one of both ends in a longitudinal direction of the catheter cable being configured to be inserted into a human body, the method comprising:

connecting the cores of the insulated electric wires to the pads respectively by the electric wire connection method according to claim 7 .