Spinal Interbody Implant Bone Screw Retention Plate
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Solution Overview
Problem
There is a need for spinal interbody devices that remain in place after implantation and provide stabilization and torsional resistance to promote vertebral fusion, while also preventing bone screws from backing out.
Innovation Solution
The implementation of a bone screw retention mechanism, which includes a retention plate and a configured plate retention area in the spinal interbody implant, uses a flexible or rigid plate with fasteners to secure the bone screws in place, preventing them from reversing once installed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If bone screws are installed to secure the interbody device, then the device stability is improved, but the risk of screw backout increases
Solution Approach 1:
A retention plate is introduced as an intermediary component between the bone screws and the interbody device. The retention plate receives the bone screws and provides a barrier that prevents them from backing out, while the configured retention area in the interbody device secures the retention plate in place. This mediator structure solves the contradiction by adding a layer of protection without compromising device stability.
2Reliability
If a retention plate is added to prevent screw backout, then screw retention is improved, but the device complexity increases
Solution Approach 1:
The retention plate and retention area are designed to work together as an integrated system. The retention plate fits into the configured retention area that is part of the interbody device structure. By merging these components into a coordinated assembly, the design achieves reliable screw retention while minimizing the increase in overall device complexity.
Solution Approach 2:
The retention mechanism is segmented into distinct functional components: the retention plate that directly contacts and retains the bone screws, and the configured retention area in the interbody device that secures the retention plate. This segmentation allows each component to be optimized for its specific function while maintaining overall system simplicity.
Data Source
AI summary
A spinal interbody implant has a bone screw retention mechanism that prohibits bone screws from backing out after the bone screws are installed. A bone screw retention plate is received in a plate retention area of the implant to provide a barrier that keeps the installed bone screws from backing out of their bone screw pocket. The bone screw retention mechanism consists of a retention plate and a configured plate retention area in a face of the implant body. Retention plate fasteners may be used to retain the configured plate. In one form, the bone screw retention mechanism consists of a retention plate, a configured plate retention area in a face of the implant body, and a retention plate bolt. In another form, the bone screw retention mechanism consists of a retention plate, a configured plate retention area in a face of the implant body, and a retention plate bolt.