Cervical Plate Screw Lock Retention Clip
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Solution Overview
Problem
Current spinal implants for stabilizing vertebrae are invasive and require prolonged recovery, and existing cervical plates lack effective mechanisms to prevent screw migration and ensure secure, long-lasting attachment to bone fragments.
Innovation Solution
A cervical plate with improved mounting screws that employ retention clips and a PEEK spring mechanism, which automatically engages screw heads during insertion and prevents backout, providing a visual indicator for proper positioning and ensuring secure fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional mounting screws are used without retention mechanism, then the device structure is simple, but the screws may migrate out of bone material during use reducing reliability
Solution Approach 1:
The retention clip is designed to automatically engage with the screw head during insertion without requiring separate manual engagement steps. The spring-loaded mechanism self-activates when the screw is inserted, pushing the screw head into the retention groove and securing it in place, thereby eliminating the need for additional manual locking operations.
Solution Approach 2:
The retention clip acts as an intermediary component between the screw and the plate body. It provides a mechanical interface that translates the simple act of screw insertion into secure retention, mediating the connection between the fastening element (screw) and the structural component (plate) while preventing screw migration.
2Reliability
If retention clips automatically engage screw heads, then screw positioning is secured, but the insertion process becomes more complex
Solution Approach 1:
The retention clip is pre-positioned in the plate with its engagement features already configured. The spring mechanism is pre-loaded and ready to activate automatically upon screw insertion. This preliminary preparation ensures that the complex retention function is triggered simply by the act of insertion itself, without requiring the operator to perform additional steps.
Solution Approach 2:
The retention clip's spring mechanism automatically engages the screw head during insertion without requiring separate manual engagement operations. The system self-activates through the insertion motion itself, transforming a potentially complex multi-step process into a single intuitive action.
3Manufacturing precision
If visual indicator for proper screw positioning is provided, then installation accuracy is improved, but the device structure becomes more complex
Solution Approach 1:
The retention clip incorporates visual indicators such as color-coded features or transparent sections that change appearance based on engagement status. When the screw is properly positioned and retained, the clip displays a specific visual signal (e.g., green indicator visible, or alignment of colored markers), providing immediate feedback to the operator without requiring complex measurement tools or procedures.
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 cervical plate achieves secure and stable fixation of vertebrae, reducing the risk of screw migration and facilitating easier post-operative removal, thereby enhancing surgical outcomes and patient recovery.
Implementation Method 1
The retention clip is constructed to automatically engage the head portion of the screws during insertion of the screw into countersunk apertures. The screw head engages the PEEK spring that is constructed and arranged to form a taper, wherein the screw head stretches the PEEK spring during installation and prevents the screw from reversing.
Data Source
AI summary
A cervical plate having improved mounting screws that employ a retention clip for automatically engaging the head portion of the screw during insertion into countersunk apertures. The arrangement prevents the mounting screws from migrating out of the bone material during use.