Multi-Shield Spinal Access for Precise Disc Entry
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Solution Overview
Problem
The anatomic window of Kambin's triangle for safe disc access is limited, and existing spinal surgical tools face challenges in safely introducing implants and protecting nervous tissue during microsurgical procedures.
Innovation Solution
A dual-shield system comprising an outer shield with a larger diameter and an inner shield with a smaller diameter is introduced, allowing for safe visualization and protection of nervous tissue, enabling precise instrument guidance and minimal tissue trauma.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard microsurgical access tool with inner diameter 16-30 mm is used, then the access window is sufficient for standard procedures, but the tool cannot safely protect nervous tissue during implant introduction through the limited Kambin's triangle
Solution Approach 1:
The patent employs a nested shield configuration where an inner shield with smaller diameter (5-12 mm) is positioned within an outer shield with larger diameter (12-30 mm). This nested structure allows the inner shield to extend further distally through the limited Kambin's triangle access window while the outer shield provides broader protection and stabilization, enabling safe nerve root protection during implant introduction
2Reliability
If the length of working shield is increased to 8-12 mm diameter reaching from facet joint line to disc entry point, then safe implant introduction is enabled, but the shield size and complexity increase
Solution Approach 1:
The working shield is segmented into two distinct functional components: an outer shield (12-30 mm diameter) that provides stabilization and broader protection, and an inner shield (5-12 mm diameter) that extends distally to the disc entry point for precise implant guidance. This segmentation allows each component to be optimized for its specific function while collectively achieving safe implant introduction
3Object-affected harmful factors
If percutaneous access technique is used, then minimal tissue trauma is achieved, but direct visual control and visualization during the procedure are lost
Solution Approach 1:
The outer shield acts as an intermediary structure that maintains a stable access channel through minimal tissue disruption while providing a platform for integrated visualization instruments. The shield's structured opening allows direct visual control during the procedure while preserving the minimal invasive benefits of percutaneous access
Data Source
AI summary
An access device for accessing an intervertebral disc having an outer shield comprising an access shield with a larger diameter (˜16-30 mm) that reaches from the skin down to the facet line, with an inner shield having a second smaller diameter (˜5-12 mm) extending past the access shield and reaches down to the disc level. This combines the benefits of the direct visual microsurgical/mini open approaches and the percutaneous, “ultra-MIS” techniques.