Preoperative Spine Alignment Planning for Pre-twisted Rod Precision
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Solution Overview
Problem
Existing methods for preoperative planning to correct spine misalignment lack precision in determining the length and curvature location of pre-twisted rods used to support the spine, leading to incorrect placement and curvature shifts during surgical correction.
Innovation Solution
The method involves a preliminary step of translating and rotating imaged spine vertebrae in the coronal and axial planes to achieve axial alignment, followed by sagittal plane adjustments to ensure precise cervical lordosis, thoracic kyphosis, and lumbar lordosis, allowing for the accurate calculation and manufacturing of pre-twisted rods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If translation and rotation are performed only in the sagittal plane to correct cervical lordosis, thoracic kyphosis, and lumbar lordosis, then the spine curvature alignment is improved, but the precision of rod length and curvature location deteriorates
Solution Approach 1:
The patent extends the correction process from a single sagittal plane to three planes: coronal plane (for scoliosis correction), axial plane (for axial alignment), and sagittal plane (for curvature correction). This multi-dimensional approach ensures that the pre-twisted rod is manufactured with precise length and curvature location by accounting for misalignments in all three anatomical planes, thereby resolving the contradiction between curvature alignment and manufacturing precision.
2Ease of manufacture
If a pre-twisted rod is manufactured based on sagittal plane correction only, then the cervical lordosis, thoracic kyphosis, and lumbar lordosis are corrected, but the rod requires iterative re-twisting during surgery
Solution Approach 1:
The patent performs preliminary corrections in the coronal and axial planes before finalizing the sagittal plane curvature correction. By addressing scoliosis and axial misalignment in advance, the system ensures that the pre-twisted rod is manufactured with accurate length and curvature location, eliminating the need for iterative re-twisting during surgery and improving surgical fit accuracy.
3Device complexity
If translation and rotation in sagittal plane are performed without prior coronal and axial plane corrections, then the process is simpler, but the curvature locations are shifted to wrong vertebrae
Solution Approach 1:
The patent divides the correction process into three distinct sequential segments: (1) coronal plane correction for scoliosis, (2) axial plane correction for axial alignment, and (3) sagittal plane correction for curvatures. This segmentation ensures that each plane is corrected independently and accurately, preventing curvature location shifts while maintaining a systematic and manageable planning process.
Data Source
AI summary
This invention relates to a method of preoperative planning to correct spine misalignment of a patient, comprising a step of making a translation and a rotation, in a sagittal plane, of each vertebra of a set of several cervical and/or thoracic and/or lumbar imaged spine vertebrae, so that said set of imaged vertebrae presents afterwards, in the sagittal plane, the same cervical lordosis and/or the same thoracic kyphosis and/or the same lumbar lordosis as a model adapted for said patient, wherein it also comprises, before said step of making said translation and said rotation in a sagittal plane: a step of making a translation and a rotation, in a coronal plane, of each vertebra of said set of several cervical and/or thoracic and/or lumbar imaged spine vertebrae, so that said set of imaged vertebrae becomes straight in said coronal plane, and of making a rotation, in an axial plane, of each vertebra of said set of several cervical and/or thoracic and/or lumbar imaged spine vertebrae, so that said set of imaged vertebrae becomes axially aligned.