Spinal Rod Locking Device With Hinged Lid
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Solution Overview
Problem
Pedicle screw and rod systems used in spinal fusion surgery are complex, leading to challenges such as multiple pieces that can be misplaced or difficult to assemble, resulting in increased surgery time and patient discomfort due to their high profile and polyaxial movement complications.
Innovation Solution
A bone attachment device with a collar and spinal rod locking mechanism that includes a hinged lid, washer, and nut system, which simplifies assembly and stabilization by locking the spinal rod in place, preventing translational motion and reducing the number of pieces required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a polyaxial screw system with multiple pieces is used to allow rod placement at various angles, then adaptability is improved, but device complexity increases and assembly becomes more difficult
Solution Approach 1:
The patent combines the polyaxial adjustment mechanism, rod coupling interface, and locking function into a single integrated coupler assembly. The yoke-like coupler integrates the rod receiving portion with the screw head engagement mechanism, eliminating the need for separate alignment tools and multiple operators. This merging reduces the number of discrete pieces while maintaining the ability to accommodate various rod angles through the integrated polyaxial design.
2Adaptability or versatility
If a polyaxial screw system with multiple pieces is used to allow rod placement at various angles, then adaptability is improved, but surgery time increases
Solution Approach 1:
The coupler is pre-assembled with the rod and locking mechanism before surgery, with the rod already positioned at the desired angle within the yoke-like structure. The set screw is pre-positioned to engage the rod. This preliminary preparation eliminates the need for complex intraoperative alignment procedures and reduces the time required to secure the rod to the screws, while still allowing for angular adjustment capabilities.
3Stability of the object's composition
If a high profile system is used to provide stable spinal segment immobilization, then stability is improved, but patient comfort deteriorates
Solution Approach 1:
The patent employs a nested configuration where the rod is received within the yoke-like coupler structure, and the coupler itself is positioned around the screw head. This nesting arrangement allows the components to be compactly arranged, reducing the overall profile and height of the assembly. The set screw locks the rod within the coupler, maintaining stability while the nested geometry minimizes the external dimensions that would cause patient discomfort.
Data Source
AI summary
A bone attachment device comprises an attachment collar having a hinged lid is disclosed. The bone attachment device may also comprise a bone fastener (such as a bone screw). A bone attachment device including an attachment collar and a spinal rod locking device is disclosed. A bone attachment device as described herein may be used together with a spinal stabilization rod and one or more additional bone attachment devices. Such devices are adapted to clamp and hold a spinal stabilization rod. Methods for implanting a spinal stabilizer having a bone attachment device including a hinged lid are disclosed.