Intervertebral Fusion Device Anterior Window Bone Graft Insertion
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Solution Overview
Problem
Intervertebral disc degeneration (DDD) leads to mechanical instability, nerve irritation, and pain due to the degradation of the extracellular matrix and impaired nutrient and waste flow, with existing treatments like fusion devices not adequately addressing the need for secure bone graft insertion and fixation.
Innovation Solution
An intervertebral fusion device with a cage having a front wall window for bone graft insertion and a faceplate for secure fixation to vertebral bodies, featuring a single vertical throughhole and screwholes for stable anchoring, allowing for bone graft placement and secure device fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a fusion device is used to replace the degenerated disc, then mechanical instability is restored and disc height is restored, but the device complexity increases and requires multiple components (cage, faceplate, screws)
Solution Approach 1:
The faceplate is integrated with the cage to form a unified fusion device structure. The faceplate is positioned at the anterior aspect of the cage and includes screwholes that align with the cage structure, creating a combined assembly that functions as a single implant unit while providing both structural support and fixation capabilities
Solution Approach 2:
The fusion device serves multiple functions: the cage provides structural support and maintains disc height, while the integrated faceplate provides fixation to the vertebral body through screws. This multi-functional design addresses both the structural and fixation requirements in a single device assembly
2Reliability
If bone graft is inserted through the cage after placement, then secure bone graft fixation is achieved, but the insertion process becomes more time-consuming and complex
Solution Approach 1:
The cage is designed with a pre-formed window in its anterior wall before implantation. This window is specifically configured to receive and accommodate bone graft material, allowing for straightforward insertion without requiring additional surgical steps to create access pathways or modify the cage structure during the procedure
3Ease of manufacture
If the cage has a window for bone graft insertion, then bone graft can be effectively inserted and secured, but the structural integrity and stability of the cage may be compromised
Solution Approach 1:
The window is positioned specifically in the anterior wall of the cage where it provides bone graft access while maintaining structural integrity in the critical load-bearing regions. The faceplate is integrated to provide additional structural support at the anterior aspect, compensating for the presence of the window and ensuring overall cage stability
Data Source
AI summary
An intervertebral fusion device having a cage having an opening or window in its front wall that allows for the insertion of bone graft therethrough after the cage has been placed into the disc space. The device further has a faceplate that covers the front wall of the cage and provides features for securing bone screws to the adjacent vertebral bodies.