Nested-Blade Surgical Access for Small-Incision Spine Corridors
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Solution Overview
Problem
Traditional open surgical techniques require large incisions and significant tissue displacement, leading to increased pain, morbidity, and healthcare costs, while minimally invasive approaches like the lateral transpsoas approach have shown promise but can be improved for faster operative times and broader applications.
Innovation Solution
A surgical access system with a dilation assembly and retraction assembly is used to create a lateral access corridor to the spine, featuring a retractor assembly with adjustable blades and nerve monitoring, allowing for precise expansion of the operative corridor without increasing incision size and minimizing nerve damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional open surgical techniques are used, then access to the surgical target site is achieved, but large incisions and significant tissue displacement are required, leading to increased pain, morbidity, and healthcare costs
Solution Approach 1:
The surgical access system divides the access corridor creation into sequential steps using multiple dilators of increasing diameter (e.g., 12mm, 14mm, 16mm, 18mm dilators). Each dilator creates a progressively larger pathway, allowing the surgeon to achieve the necessary access size without requiring a single large incision, thereby reducing tissue disruption while maintaining surgical accessibility
Solution Approach 2:
The retractor assembly features nested blades (first blade, second blade, third blade) that can be inserted within one another in a collapsed state and then deployed outward to expand the access corridor. This nested configuration allows the retractor to be introduced through a small incision while providing large tissue retraction capability once deployed, minimizing incision size while maximizing access
2Object-affected harmful factors
If minimally invasive lateral transpsoas approach is used, then patient morbidity and hospitalization length are reduced, but operative time and surgical precision can be improved
Solution Approach 1:
The system performs preliminary actions by first inserting a guidewire through the psoas muscle to the target vertebral level, then sequentially dilating the tissue along the guidewire path, and finally inserting the retractor over the dilators. This preliminary preparation of the access corridor before introducing the retractor streamlines the procedure, reduces operative time, and maintains the minimally invasive benefits of the lateral approach
Solution Approach 2:
The retractor blades are designed with dynamic adjustment capabilities, allowing the surgeon to independently position and angle each blade (first blade, second blade, third blade) to optimize the access corridor geometry in real-time. This dynamic adjustability enables precise adaptation to different anatomical variations and surgical requirements, improving surgical precision while maintaining efficient operative flow
3Manufacturing precision
If the retractor assembly is designed with adjustable blades for precise expansion, then surgical precision is improved, but device complexity increases
Solution Approach 1:
The retractor assembly is segmented into multiple independent blades (first blade, second blade, third blade), each capable of independent adjustment. This segmentation allows precise control of the access corridor geometry by adjusting individual blades rather than moving the entire retractor structure, achieving high precision while keeping each blade's adjustment mechanism relatively simple
Solution Approach 2:
The retractor blades are designed with multi-functionality, serving both as structural elements that maintain the access corridor and as adjustable components that can be independently positioned to optimize geometry. The blades can function in multiple configurations (retracted, partially extended, fully extended, angled), reducing the need for separate adjustment mechanisms and simplifying the overall device structure while maintaining precision
Data Source
AI summary
A surgical access system comprising a tissue dilation assembly and a tissue retraction assembly, both of which may be equipped with one or more electrodes for use in detecting the existence of (and optionally the distance and/or direction to) neural structures.