JP-2026075954-A - extracorporeal correction device

Abstract

[Problem] To provide an external corrective device that can correct spinal deformities through external manipulation, thereby ensuring a desired correction rate, eliminating the complexity of corrective fixation surgery using a spinal deformity correction and fixation system, and ultimately reducing the burden on the patient. [Solution] The external orthodontic device 1A comprises a shaft member 27 that is detachably attached to each screw member and extends outward from the patient's body, and first and second orthodontic means 28 and 29 that orthodontic and hold the multiple shaft members 27 arranged along the patient's head-to-tail direction according to the surgeon's intentions, with the first and second orthodontic means 28 and 29 provided in pairs above and below each shaft member 27. This ensures the desired correction rate and eliminates the complexity of orthodontic fixation surgery using a spinal deformity correction and fixation system, thereby further reducing the burden on the patient. [Selection Diagram] Figure 6

Inventors

• 江原 宗平

Assignees

• ミズホ株式会社

Dates

Publication Date

20260511

Application Date

20241023

Claims (6)

1. An external corrective device for correcting and fixing spinal deformities by manipulating the spinal deformity from outside the body, when correcting and fixing spinal deformities using a spinal deformity correction and fixing system comprising a vertebral fixation device fixed to each vertebra of the spine and a rod member connected to the vertebral fixation device, wherein the spinal deformity is corrected by external manipulation to assist the correction and fixing by the spinal deformity correction and fixing system, Each vertebral fixation device, which is fixed to each vertebra of the spine, is detachably attached to a shaft member that extends outward from the patient's body, It comprises a corrective means for correcting and holding multiple shaft members positioned along the head-to-tail direction of the patient, according to the operator's intentions, An external orthopedic device characterized by providing a pair of corrective means on the upper and lower parts of each shaft member.
2. The external orthodontic device according to claim 1, characterized in that the corrective means comprises a pair of clamping plates that correct and hold the outer surfaces of multiple shaft members by clamping them from the left and right directions of the patient.
3. The external orthodontic device according to claim 2, characterized in that the corrective means comprises a pressing mechanism that presses the pair of clamping plates together so that they are close to each other.
4. The extracorporeal orthodontic device according to claim 2 or 3, characterized in that a plate member made of synthetic resin is fixed to the opposing inner surfaces of the pair of clamping plates.
5. The external orthopedic device according to claim 1, characterized in that the orthodontic means comprises an orthodontic holding plate arranged along each of the shaft members, and an orthodontic screw mechanism that pulls each of the shaft members towards the orthodontic holding plate.
6. The external orthopedic device according to claim 5, characterized in that the orthodontic retaining plate is curved to conform to the lordosis and/or kyphosis of the spine.

Description

This invention relates to an external corrective device that can be used to assist in correcting and fixing spinal deformities during spinal deformity correction and fixation surgery. The system comprises vertebral fixation devices fixed to multiple vertebrae, and rod members connected to these vertebral fixation devices. In a normal state, the spine is generally straight when viewed from behind, and when viewed from the side, it exhibits a roughly S-shape, with the cervical and lumbar vertebrae curving forward and the thoracic and sacral vertebrae curving backward. On the other hand, spinal deformities, which cause abnormalities in the spine, are diseases in which the spine is deformed, such as scoliosis, kyphosis, and lateral kyphosis. Scoliosis is a disease in which the spine curves to the right or left (laterally) and twists. Kyphosis is a disease in which the angle of thoracic kyphosis becomes extremely large, or the lumbar lordosis is lost and the spine deforms into kyphosis. Furthermore, lateral kyphosis is a combination of scoliosis and kyphosis. In treating spinal deformities, spinal deformity correction and fusion surgery is widely performed. This surgery uses a spinal deformity correction and fusion system (implantable material, so-called implant) to correct and fix the deformed spine to a normal or near-normal state. Posterior or anterior correction and fusion techniques are applied. Posterior correction and fusion, in particular, is performed as follows: The patient is positioned prone on the operating table, and a surgical incision, or a minimally invasive percutaneous incision, is made in the midline of the patient's back to expose the posterior elements of the spine. Subsequently, a spinal deformity correction and fusion system (see, for example, Patent Document 1) is attached to the spine to correct the spinal deformity three-dimensionally and fix it in that state. Generally, spinal deformity correction and stabilization systems employ components such as multiple screw members that are screwed into each vertebra via a pair of pedicles on the left and right sides of each vertebra, and a pair of rod members connected to the top-open grooves of each screw member, extending along the axial direction of the spine and spaced apart in the left-right direction of the patient. For example, in a posterior corrective fusion surgery for a patient with scoliosis, where the aforementioned spinal deformity correction and fusion system is attached to the spine to correct and fix the deformity, the screw members are first fixed to each of the vertebrae to be corrected. Next, the rod members are engaged with the top open grooves of the screw members. At this point, although the spine is deformed, the rod members extend in a straight line, making it very difficult to engage them with the top open grooves of the screw members. Therefore, the surgeon uses a specialized surgical instrument to bend the rod members to conform to the scoliotic deformity of the spine. Then, these bent rods are engaged with the top open grooves of the screw members fixed to each vertebra, and the set screws are temporarily fastened to the top open grooves of each screw member to prevent the rod members from coming out. Next, the outer surface of the rod member is gripped with a specialized surgical instrument equivalent to pliers (such as a rod gripper), and the instrument is rotated approximately 90°. This rotation of the rod member around its axis corrects the scoliotic deformation, including the twisting of the spine. Furthermore, using other specialized surgical instruments, compressive or tensile loads are applied to multiple screw members, for example, arranged along the axial direction of the spine, to correct the scoliotic deformation. After these corrective operations, the set screws are tightened to firmly connect the rod member to each screw member, thereby correcting and fixing the spine. Japanese Patent Publication No. 2012-213625 Figure 1 is a cross-sectional view of a spinal deformity correction and fixation system to which the external corrective devices according to the first and second embodiments of the present invention are applied.Figure 2 is a perspective view showing a state in which a rod member is fixed to a screw member of a spinal deformity correction and fixation system to which the external orthodontic device according to the first and second embodiments of the present invention is applied.Figure 3 is a perspective view of the screw member shown in Figure 2.Figure 4 is a plan view showing screw members fixed to each vertebra of the spine of a patient suffering from scoliosis.Figure 5 is a plan view showing the state in which the scoliosis of the spine has been corrected and fixed by a spinal deformity correction and fixation system.Figure 6 is a perspective view of an external orthopedic device according to the first embodiment of the present invention.Figure 7 is a perspective view of an external orthodo