Spinal Correction System Segmental Derotation
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Solution Overview
Problem
Current surgical treatments for spinal disorders, such as scoliosis and kyphosis, often fail to effectively correct deformities and maintain alignment due to limitations in existing implant technologies that stress bone-screw interfaces and lack efficient methods for sagittal, coronal, and axial plane corrections.
Innovation Solution
A spinal correction system and method utilizing multi-axial pedicle screws, sagittal angulation screws, and reduction instruments to segmentally derotate and align vertebrae, minimizing stress on bone-screw interfaces and allowing for precise correction in multiple planes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional implants are used for spinal correction, then surgical treatment can be performed, but the bone-screw interface experiences excessive stress leading to failed corrections
Solution Approach 1:
The invention divides the correction process into segmental derotation steps, where each vertebra is corrected individually through controlled rotation about the longitudinal axis. This segmentation allows for distributed stress application rather than concentrated force, reducing peak stresses at bone-screw interfaces while achieving cumulative correction效果
Solution Approach 2:
The system employs dynamic adjustment capabilities where the degree of derotation can be controlled and adjusted during the surgical procedure. This dynamic approach allows the surgeon to apply correction forces gradually and adaptively, optimizing the balance between achieving correction and minimizing interface stress
2Adaptability or versatility
If existing implant technologies are used, then spinal fixation can be achieved, but efficient correction in multiple planes (sagittal, coronal, axial) is not possible
Solution Approach 1:
The correction system is designed with multi-functional capabilities to address deformities in multiple planes (sagittal, coronal, and axial). The same implant system and surgical approach can correct various types of spinal deformities regardless of the primary plane of deformity, eliminating the need for separate specialized systems for each correction type
Solution Approach 2:
The invention introduces derotation capability around the longitudinal axis (axial plane correction) in addition to traditional sagittal and coronal plane adjustments. This adds a rotational dimension to the correction process, enabling comprehensive three-dimensional alignment control through a unified system rather than requiring separate mechanisms for each plane
3Manufacturing precision
If conventional surgical methods are used, then spinal disorders can be treated, but deformity correction and alignment maintenance are ineffective
Solution Approach 1:
The surgical procedure employs preliminary positioning and temporary fixation steps that establish the desired vertebral alignment before final implant securing. This preliminary action allows the surgeon to plan and execute the precise derotation sequence, ensuring accurate alignment is achieved and maintained throughout the procedure
Data Source
AI summary
A method for treating vertebrae comprises the steps of: connecting at least one fastener with portions of vertebrae; providing a fastener comprising a first portion including a receiver defining an implant cavity and a member disposable with the implant cavity and movable relative to the receiver, and a second portion defining a longitudinal axis and being configured to penetrate vertebral tissue, wherein the receiver is non-pivotable relative to the longitudinal axis and connecting the fastener to the vertebrae; providing a longitudinal element; connecting a first portion of the longitudinal element with the at least one fastener; derotating the vertebrae to a selected orientation; and connecting a second portion of the longitudinal element with the fastener to substantially maintain the vertebrae in the selected orientation. Systems are disclosed.