# US 2021/0330360 A1 · Rod group, arcuate rod, s-shaped rod, spine stabilization system, and rod manufacturing method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0330360 A1 - Document ID: US20210330360A1 - Status: Published application - Kind: A1 - Application number: 16/337,450 - Filed: 2018-08-01 - Published: 2021-10-28 - Earliest claimed: 2018-02-28 - Assignees: National University Corporation Hokkaido University; Robert Reid, Inc. - Applicants: National University Corporation Hokkaido University; Robert Reid, Inc. - Inventors: Hideki Sudo; Satoshi Kanai; Terufumi Kokabu; Yuichiro Abe; Tsuyoshi Segawa - Web page: https://patentgrep.com/patent/US20210330360A1 ## CPC - A61B 17/7011: {Longitudinal element being non-straight, e.g. curved, angled or branched (adjustable length longitudinal elements A61B17/7014; A61B17/7019 takes precedence, e.g. coil springs)} - A61B 17/7013: {the shape of the element being adjustable before use (adjustable length plates A61B17/7014)} - A61B 17/7085: {for insertion of a longitudinal element down one or more hollow screw or hook extensions, i.e. at least a part of the element within an extension has a component of movement parallel to the extension's axis} - A61B 2017/00526: {Methods of manufacturing} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract A rod group includes a plurality of first rods that has an arcuate first curve, the first rods having mutually different lengths; and a plurality of second rods that has an S-shaped second curve, the second rods having mutually different lengths. The first rods and the second rods have shapes for treatment of scoliosis by (i) guiding the postoperative apex of the thoracic kyphosis to be located at the thoracic vertebrae T6 to T8, and (ii) guiding a postoperative apex of the thoracic kyphosis to be located at a position different from a preoperative apex of the thoracic kyphosis and the second rod each have a shape extending along an anatomically normal spinal column arrangement. ## Claims ### Claim 1 A rod group comprising: a plurality of first rods that has an arcuate first curve, the first rods having mutually different lengths; and a plurality of second rods that has an S-shaped second curve, the second rods having mutually different lengths, wherein the first rods have (i) in a shape extending along thoracic kyphosis of an anatomically normal spinal column arrangement, a curved section and a straight section to be attached to thoracic vertebrae, or (ii) in a shape extending along thoracic kyphosis of an anatomically normal spinal column arrangement, a curved section and reverse curved section to be attached to the thoracic vertebrae, the second rods have (i) in a shape extending along thoracic kyphosis of an anatomically normal spinal column arrangement, a first curved section to be attached to the thoracic vertebrae, and (ii) in a shape extending along lumbar lordosis of an anatomically normal spinal column arrangement, a second curved section to be attached to lumbar vertebrae, and the first rods and the second rods have shapes for treatment of scoliosis by (i) guiding the postoperative apex of the thoracic kyphosis to be located at the thoracic vertebrae T6 to T8, and (ii) guiding a postoperative apex of the thoracic kyphosis to be located at a position different from a preoperative apex of the thoracic kyphosis and the second rod each have a shape extending along an anatomically normal spinal column arrangement. ### Claim 2 An arcuate rod for treatment of scoliosis and having that has an arcuate curve, wherein the arcuate rod has (i) in a shape extending along thoracic kyphosis of an anatomically normal spinal column arrangement, a curved section and a straight section to be attached to thoracic vertebrae, or (ii) in a shape extending along thoracic kyphosis of an anatomically normal spinal column arrangement, a curved section and reverse curved section to be attached to the thoracic vertebrae, and the arcuate rod has a shape for treatment of scoliosis by (i) guiding a postoperative apex of the thoracic kyphosis to be located at the thoracic vertebrae T6 to T8, and (ii) guiding the postoperative apex of the thoracic kyphosis to be located at a position different from a preoperative apex of the thoracic kyphosis. ### Claim 3 (depends on 2) The arcuate rod according to claim 2, comprising: a curved section and a straight section, wherein a length of the straight section is one quarter to one half a rod length, inclusive. ### Claim 4 (depends on 2) The arcuate rod according to claim 2, comprising: a curved section and a reverse curved section that curves in an opposite direction to the curved section, wherein a length of the reverse curved section is less than or equal to a fifth of a rod length. ### Claim 5 An S-shaped rod for treatment of scoliosis and having that has an S-shaped curve comprising: a first curved section; and a second curved section that curves in an opposite direction to the first curved section, wherein the first curved section has a shape extending along thoracic kyphosis of an anatomically normal spinal column arrangement, and the second curved section has a shape extending along lumbar lordosis of an anatomically normal spinal column arrangement the S-shaped rod has (i) in a shape extending along thoracic kyphosis of an anatomically normal spinal column arrangement, a first curved section to be attached to thoracic vertebrae, and (ii) in a shape extending along lumbar lordosis of an anatomically normal spinal column arrangement, a second curved section to be attached to lumbar vertebrae, and the S-shaped rod has a shape for (i) guiding the postoperative apex of the thoracic kyphosis to be located at the thoracic vertebrae T6 to T8, and (ii) guiding the postoperative apex of the thoracic kyphosis to be located at a position different from a preoperative apex of the thoracic kyphosis. ### Claim 6 (depends on 5) The S-shaped rod according to claim 5, wherein a length of the first curved section is one half to two-thirds of a rod length, inclusive. ### Claim 7 (depends on 2) A spine stabilization system comprising: the arcuate rod according to claim 2; and a plurality of coupling device attachment elements for attaching the arcuate rod to a spinal column. ### Claim 8 (depends on 5) The spine stabilization system comprising: the S-shaped rod according to claim 5; and a plurality of coupling device attachment elements for attaching the S-shaped rod to a spinal column. ### Claim 9 A rod manufacturing method comprising: a rod data acquisition step of acquiring data indicating a plurality of rod shapes that was bent into shapes extending along anatomically normal spinal column arrangements; a length classification step of classifying data indicating the rod shapes acquired at the rod data acquisition step into groups of rod lengths with a difference of reference length; a rod shape acquisition step of acquiring data indicating best-fit curves from the rod shapes included in groups classified at the length classification step; and a rod making step of making rods used in spinal deformity correction and fusion, according to the best-fit curves acquired at the rod shape acquisition step. ### Claim 10 (depends on 2) An arcuate rod according to claim 2, wherein the arcuate rod has a length matching a length of the spinal column of a patient. ### Claim 11 (depends on 5) An S-shaped rod according to claim 5, wherein the S-shaped rod has a length matching a length of the spinal column of a patient. ### Claim 12 A method for treatment of scoliosis comprising: a prediction step of predicting an anatomically normal spinal column arrangement without thoracic idiopathic scoliosis for a patient with thoracic idiopathic scoliosis; a rod attachment step of attaching to the spinal column of the patient a pair of rods having shapes extending along the spinal column arrangement predicted in the prediction step; a rod rotation step of rotating the attached pair of rods; wherein the method guides the postoperative apex of the thoracic kyphosis to the thoracic vertebrae T6 to T8 and guides the postoperative apex to a position different from a preoperative apex of the thoracic kyphosis. ### Claim 13 (depends on 12) The method for treatment of scoliosis according to claim 12, wherein in the prediction step, the spinal column arrangement is predicted for which the apex of the thoracic kyphosis is located at the thoracic vertebrae T6 to T8. ### Claim 14 (depends on 12) The method for treatment of scoliosis according to claim 12, wherein in the rod attachment step the facet joints are resectioned, and the rods are attached to the spinal column of the patient by coupling device attachment elements. ### Claim 15 (depends on 12) The method for treatment of scoliosis according to claim 12, wherein in the rod attachment step, a plurality of first rods and a plurality of second rods are selected to match lengths of the spinal column of the patient, the first rods having an arcuate first curve and mutually different lengths, the second rods having an S-shaped second curve and mutually different lengths, and the selected first rods or second rods are attached to the spinal column of the patient. ### Claim 16 (depends on 15) The method for treatment of scoliosis according to claim 15, wherein the first rods have (i) in a shape extending along thoracic kyphosis of an anatomically normal spinal column arrangement, a curved section and a straight section to be attached to thoracic vertebrae, or (ii) in a shape extending along thoracic kyphosis of an anatomically normal spinal column arrangement, a curved section and reverse curved section to be attached to thoracic vertebrae, the second rods have (i) in a shape extending along thoracic kyphosis of an anatomically normal spinal column arrangement, a first curved section to be attached to the thoracic vertebrae, and (ii) in a shape extending along lumbar lordosis of an anatomically normal spinal column arrangement, a second curved section to be attached to lumbar vertebrae, the first rods and the second rods having shapes for (i) guiding a postoperative apex of the thoracic kyphosis to be located at the thoracic vertebrae T6 to T8, and (ii) guiding the postoperative apex of the thoracic kyphosis to be located at a position different from a preoperative apex of the thoracic kyphosis. ### Claim 17 (depends on 12) The method for treatment of scoliosis according to claim 12, further comprising: a rod processing step of processing the pair of rods into a shape extending along the spinal column arrangement predicted in the prediction step. ### Claim 18 (depends on 17) The method for treatment of scoliosis according to claim 17, wherein the rod processing step comprises: a layering step of lamination into rod-shaped laminate bodies by layered manufacturing; and a heat treatment step of heat treating to eliminate residual stresses in a lamination direction of the rod-shaped laminate bodies.