Modular Vertebral Reduction Instrument With Scissor Mechanism
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Solution Overview
Problem
Current spinal reduction instruments for spondylolisthesis treatment lack the flexibility to perform reduction at any spinal level, especially in the cervical spine, and cannot independently control translation and distraction/compression, limiting their effectiveness in correcting vertebral body displacement.
Innovation Solution
A reduction instrument with modular design allowing independent orthogonal translations, featuring a base unit that attaches to vertebral anchors and a primary device with a scissor mechanism to control Translation-1 and Translation-2, enabling intuitive and controlled correction of vertebral segment deformities, compatible with various spinal implant systems including the DePuy Expedium pedicle screw system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If prior spinal reduction instruments are used, then stabilization of the segment can be accomplished, but the reduction of the deformity is limited and cannot independently control translation and distraction/compression
Solution Approach 1:
The reduction instrument is divided into separate functional components: a base unit that attaches to vertebral anchors and a primary device with scissor mechanism. This segmentation allows independent control of translation and distraction/compression movements, enabling precise correction of vertebral body displacement without requiring complex integrated systems.
Solution Approach 2:
The instrument incorporates a scissor mechanism that provides dynamic, continuous adjustment capabilities for both translation and distraction/compression. This dynamic design allows the instrument to adapt to different spinal levels and deformity configurations, particularly enabling reduction in the cervical spine where fixed designs would be ineffective.
2Adaptability or versatility
If current reduction instruments are used, then some reduction capability is provided, but they lack flexibility to perform reduction at any spinal level, especially in the cervical spine
Solution Approach 1:
The reduction instrument is designed with universal applicability across different spinal levels including cervical, thoracic, and lumbar regions. The base unit with vertebral anchor attachment and the scissor mechanism primary device can be configured for various spinal anatomies, providing multi-functional capability that enables reduction at any spinal level without requiring level-specific instruments.
3Manufacturing precision
If prior instruments with coupled control are used, then device simplicity is maintained, but uncoupled control of translation and distraction/compression is not achieved
Solution Approach 1:
The instrument separates the control mechanisms for translation and distraction/compression into independent systems. The base unit handles anchor attachment while the primary device with scissor mechanism provides independent control of both movement types. This segmentation enables precise correction by allowing each degree of freedom to be controlled separately, achieving uncoupled control without requiring overly complex integrated mechanisms.
Data Source
AI summary
Featured is a reduction instrument being configured and arranged to allow correction of vertebral translation and applying distraction across a segment in an independent fashion. Such a reduction instrument embodies one or more identical modules that are configured as needed for correcting the deformity. In more particular embodiments, each of the one or more modules has two degrees of freedom (DOF) with uncoupled orthogonal translations. Such a reduction instrument allows the reorientation of the vertebral segment as needed via uncoupled orthogonal translations. Such a reduction instrument also is usable in combination with a plurality of vertebral anchors, such vertebral anchors being any such vertebral anchors as are know to those skilled in the art (e.g., conventional spinal pedicle screw instrumentation) or hereinafter developed so as to form a spinal implant system. Also featured are treatment methods utilizing such a reduction instrument.