Anterior Spinal Retraction With Offset Blade Segmentation
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Solution Overview
Problem
Current surgical access methods for the spine, such as anterior and posterior approaches, face challenges in accessing multiple levels like L5-S1 and L4-L5 due to anatomical limitations, requiring surgeons to choose between approaches that either compromise on access or patient positioning during procedures.
Innovation Solution
A retractor assembly with a main frame and offset retractor blades, allowing for an operative corridor creation with adjustable and independent blade positioning, enabling flexible access to the lumbar spine from an anterior approach, particularly suitable for Lateral ALIF procedures, minimizing interference with tool manipulation and imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a lateral approach is used to access the spine, then access to upper levels (L4-L5) is achieved with large exposure and avoidance of muscle stripping, but access to lower levels (L5-S1) is blocked by the iliac crest
Solution Approach 1:
The retractor system is divided into a main retractor assembly and an independent offset retractor blade. The main retractor provides the primary lateral approach exposure for upper levels, while the independent offset blade can be positioned medially to access the L5-S1 disc space that would otherwise be blocked by the iliac crest. This segmentation allows each retractor component to address specific anatomical challenges at different spinal levels.
Solution Approach 2:
The independent offset retractor blade acts as an intermediary structure that bridges the gap between the lateral approach and the need to access medial structures at L5-S1. By positioning this blade medially relative to the main retractor, the system creates a combined exposure that allows instrument access to both upper levels through the lateral approach and lower levels through the offset blade's medial positioning.
2Adaptability or versatility
If anterior approach is used to access L5-S1, then access to lower levels is achieved, but patient repositioning is required when combining with lateral approach for upper levels
Solution Approach 1:
The main retractor and independent offset retractor blade are combined into a single integrated system that maintains both components in position simultaneously. This merging eliminates the need to remove and reposition the patient between procedures, as both the lateral approach (for upper levels) and the offset medial access (for L5-S1) are maintained concurrently through the combined retractor structure.
3Device complexity
If traditional retractor assemblies are used, then simple structure is maintained, but interference with tool manipulation and imaging occurs
Solution Approach 1:
The independent offset retractor blade is extracted as a separate, independently positionable component from the main retractor assembly. This extraction allows the offset blade to be positioned medially without requiring complex mechanical linkages to the main retractor, maintaining relative structural simplicity while creating sufficient space for tool manipulation and imaging equipment access through the operative corridor.
Data Source
AI summary
A surgical retractor assembly is provided having a frame that releasably couples two retractor blades. The retractor blades are coupled to the frame via a pair of mobile carriages that engage a track on the frame. A third retractor blade is configured to be independent of the frame with the first two retractor blades. The independent blade may be fixably positionable in the patient by a direct coupling to a rigid table mount. The retractor assembly may be utilized for creating anterior access to spinal target site while the patient is oriented in the lateral decubitus position.