US 12,459,139 B2
Bending structure and joint function part
Motoyuki Otsuka, Yokohama (JP); Takafumi Hirata, Yokohama (JP); Shimpei Kurokawa, Yokohama (JP); and Yuki Hotoda, Yokohama (JP)
Assigned to NHK Spring Co., Ltd.
Appl. No. 17/799,384
Filed by NHK SPRING CO., LTD., Yokohama (JP)
PCT Filed Feb. 12, 2021, PCT No. PCT/JP2021/005247
§ 371(c)(1), (2) Date Aug. 12, 2022,
PCT Pub. No. WO2021/162089, PCT Pub. Date Aug. 19, 2021.
Claims priority of application No. 2020-022901 (JP), filed on Feb. 13, 2020.
Prior Publication US 2023/0339124 A1, Oct. 26, 2023
Int. Cl. B25J 18/06 (2006.01); A61B 17/29 (2006.01); A61B 34/30 (2016.01); A61M 25/01 (2006.01)
CPC B25J 18/06 (2013.01) [A61B 2017/2905 (2013.01); A61B 2034/301 (2016.02); A61M 25/0138 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A bending structure being bendable with respect to an axial direction, comprising:
an outer coiled part formed of a wire which is wound in a coiled shape to have a plurality of coils in the axial direction; and
an inner coiled part formed of a wire which is wound in a coiled shape to have a plurality of coils in the axial direction and located inside the outer coiled part, wherein
the outer coiled part has a plurality of gaps to distance adjacent coils in the axial direction,
the coils of the inner coiled part are provided so as to correspond to the gaps of the outer coiled part and fit between the adjacent coils of the outer coiled part while being in contact with the adjacent coils of the outer coiled part, and
a dimension (P) is set in a range meeting π(R)/4(N)≤P<(d)−π(R)/4(N) in which (P) is the dimension of a gap of the outer coiled part in the axial direction in a free state, (N) is the number of turns of the outer coiled part, (R) is a diameter of the outer coiled part, and (d) is a wire diameter of the wire of the inner coiled part.