Spinal Correction via Multi-Axial Screw Derotation
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Solution Overview
Problem
Current surgical methods for correcting spinal disorders, such as scoliosis and kyphosis, often require invasive procedures and struggle to effectively derotate vertebral bodies while maintaining precise alignment, leading to incomplete correction and potential complications.
Innovation Solution
A spinal correction system and method involving the use of multi-axial pedicle screws, reduction instruments, and pre-formed spinal rods to derotate vertebral bodies by rotating the screws relative to the rods, allowing for precise sagittal and coronal plane correction through minimally invasive techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional surgical methods are used to correct spinal deformities, then the procedures are invasive and complex, but the ability to effectively derotate vertebral bodies while maintaining precise alignment is limited
Solution Approach 1:
The correction system is divided into separate functional components: a longitudinal element with implant cavities for structural support, and multiple independent fasteners with derotation capabilities for precise vertebral alignment. This segmentation allows each component to be optimized independently while simplifying the overall surgical procedure.
Solution Approach 2:
The fasteners incorporate movable elements that allow dynamic adjustment during surgery. The first element can move relative to the second element to enable derotation of vertebral bodies, and the implant cavities can accommodate the longitudinal element in various orientations, providing dynamic correction capabilities.
2Ease of operation
If minimally invasive techniques are used, then patient recovery is enhanced and surgical outcomes are improved, but the ability to perform precise derotation and alignment is reduced
Solution Approach 1:
The longitudinal element acts as an intermediary structure that connects multiple vertebrae through implant cavities. This mediator allows precise alignment and derotation to be achieved through the fasteners while maintaining a minimally invasive approach, as the correction is transmitted through the rigid longitudinal element rather than requiring direct manipulation of each vertebra.
Solution Approach 2:
The fasteners are designed with nested components where the second element (penetrating element) is positioned within or relative to the first element (defining the implant cavity). This nested structure allows compact, minimally invasive insertion while maintaining the mechanical leverage needed for precise derotation and alignment control.
Data Source
AI summary
A method for treating a spine comprises the steps of: fastening a plurality of fasteners with a lateral portion of vertebrae, each of the fasteners including a first element that defines an implant cavity and a second element configured for penetrating the vertebrae; providing a longitudinal element including a portion having a selected curvature; disposing the longitudinal element with the implant cavities such that the portion is disposed in a selected orientation relative to the vertebrae; and moving a first element of at least one of the fasteners relative to the portion such that a second element of the at least one of the fasteners derotates the vertebrae while maintaining the portion in the selected orientation. Systems and implants are disclosed.