Self-Distracting Interbody Cage for Minimally Invasive Spinal Fusion
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Solution Overview
Problem
Current interbody cage systems face challenges in maintaining proper vertebral separation, requiring additional tools for distraction, difficulty in delivering fluids to the disk space, and ease of removal during spinal fusion procedures.
Innovation Solution
An interbody cage system with tapered insertion and gripping surfaces, an insertion tool for self-distraction and rotation, and a delivery device for fluid delivery, facilitating easy insertion, stabilization, and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a typical interbody cage is used, then bone graft material can be packed and fusion can be facilitated, but proper separation between vertebrae cannot be maintained during insertion
Solution Approach 1:
The cage is designed with pre-formed distraction surfaces that automatically separate the vertebrae during insertion. The tapered distraction surfaces are built into the cage structure before surgery, allowing the cage to perform the distraction function as it is inserted, eliminating the need for separate distraction tools or steps.
Solution Approach 2:
The cage performs multiple functions simultaneously: it provides structural support, maintains vertebral separation through its distraction surfaces, and facilitates insertion through its tapered geometry. The cage is self-distracting during insertion, meaning the act of inserting the cage itself creates the necessary separation between vertebrae without requiring additional active intervention.
2Reliability
If additional distraction tools are used, then proper vertebral separation can be achieved, but device complexity and surgical tool requirements increase
Solution Approach 1:
The distraction function is merged with the cage structure itself. The distraction surfaces are integrated into the cage body, combining the support function and separation function into a single device. This eliminates the need for separate distraction tools, reducing overall device complexity while maintaining reliable vertebral separation.
3Length of moving object
If a minimally invasive approach is used, then percutaneous aperture size is reduced, but cage insertion and distraction become more difficult
Solution Approach 1:
The cage is designed with a tapered geometry that segments the insertion path into different zones. The tapered distraction surfaces create a progressive insertion pathway that allows the cage to be introduced through a smaller aperture while automatically creating the necessary distraction space as it advances, making minimally invasive insertion feasible.
4Ease of operation
If the cage is designed for easy removal, then cage extraction is simplified, but structural stability during fusion may be compromised
Solution Approach 1:
The cage design incorporates features that allow it to transition from a stable, load-bearing structure during fusion to a removable configuration. The tapered distraction surfaces and internal geometry are designed to provide stable anchoring during the fusion process while allowing controlled removal through the same tapered pathways, balancing stability and removability.
Data Source
AI summary
An interbody cage system includes an interbody cage having a proximal end, a distal end, and an interior. The interbody cage system also includes an insertion tool. A portion of the insertion tool extends into the proximal end and the interior.