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    • 6. 发明公开
    • TWO-LAYER COIL STRUCTURE
    • EP4437970A1
    • 2024-10-02
    • EP22898526.3
    • 2022-11-21
    • Asahi Intecc Co., Ltd.
    • HASHIMOTO Takaya
    • A61B8/12A61B17/3205F16C1/02
    • A61B17/3205A61B8/12F16C1/02
    • A torque coil (two-layer coil structure) 10 of the disclosed embodiments includes an inner coil 11 formed by spirally winding metal wire 111, and an outer coil 12 arranged to be in close contact with the outer periphery of the inner coil 11 and formed by spirally winding metal wire 121. In the torque coil 10, a winding direction of the inner coil 11 and a winding direction of the outer coil 12 are opposite from each other, and when the torque coil 10 is twisted in the circumferential direction being the direction where the diameter of the inner coil 11 is increased, a change amount of the diameter of the outer coil 12 is larger than a change amount of the diameter of the inner coil 11. A length 1596 mm is set as one unit of each of the inner coil 11 and the outer coil 12, and the change amount d1 of the diameter of the inner coil 11 when the inner coil 11 of the one unit length is twisted by 360° in the circumferential direction being the direction where the diameter of the inner coil 11 is increased, and the change amount d2 of the diameter of the outer coil 12 when the outer coil 12 of the one unit length is twisted by 360° in the circumferential direction being the direction where the diameter of the outer coil 12 is decreased, satisfy the relation of -4.5