Spinal Cross Connector Single Locking Mechanism
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Solution Overview
Problem
Existing spinal fixation systems face challenges in providing maximum strength and stability while being easy to use, particularly due to the time-consuming process of locking multiple mechanisms and vulnerability to torsional forces.
Innovation Solution
A cross connector assembly composed of surgical-grade materials, featuring a set screw, adjustable wedge, housing, closure plate, and securing blocks, which securely engages elongate members to resist torsional stress and facilitate easy assembly and disassembly during spinal surgery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple locking mechanisms are used in spinal cross connectors, then the stability and strength of the fixation system is improved, but the implantation time and operational complexity increase
Solution Approach 1:
The patent combines multiple locking functions into a single integrated locking mechanism. The set screw simultaneously locks the rod to the cross connector body and secures the securing block in place, eliminating the need for separate locking steps and reducing implantation time while maintaining stability.
Solution Approach 2:
The set screw performs multiple functions: it acts as both a locking mechanism for the rod and a securing mechanism for the blocking element. This multi-functional design reduces the number of components and locking operations required during surgery.
2Strength
If traditional cross connectors are used to resist torsional forces, then the strength of the fixation system is improved, but the device complexity and number of components increase
Solution Approach 1:
The patent integrates the rod locking function and the securing block locking function into a single set screw mechanism. This unified approach maintains the strength needed to resist torsional forces while reducing device complexity and the number of moving parts.
Solution Approach 2:
The cross connector is divided into distinct functional elements (housing, securing blocks, set screw) that work together through a single locking action. This segmentation allows each component to be optimized for its specific function while simplifying the overall assembly process.
3Adaptability or versatility
If modular spinal fixation systems are used to accommodate patient-specific anatomy, then the adaptability is improved, but the assembly complexity increases
Solution Approach 1:
The cross connector design provides universal adaptability through its modular nature and ability to accommodate different rod configurations while maintaining a simple, consistent assembly process. The same set screw mechanism works for various rod sizes and connector configurations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The cross connector assembly enhances the stability and strength of spinal fixation systems by evenly distributing force across elongate members, reducing the complexity of assembly, and minimizing dural impingement, thereby improving surgical outcomes.
Implementation Method 1
threadably receiving the set screw into the housing. The advancement of the set screw into the housing secures the elongate members to the cross connector assembly.
Implementation Method 2
adjustable wedge, housing, closure plate, and securing blocks, which securely engages elongate members to resist torsional stress
Data Source
AI summary
The present application describes a spinal cross-connector and related methods for augmenting and stiffening spinal fixation constructs. The cross connector may include multiple rod-stabilization members that simultaneously engage respective rods of a fixation construct. Simultaneous engagement by the rod-stabilization members may be effectuated by a single locking step.