Offset Hohmann Retractor Blade Asymmetry
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Solution Overview
Problem
Existing Hohmann blades are limited in their ability to efficiently and effectively access and retract tissue in various surgical procedures, particularly in complex anatomical regions such as the spine, due to their fixed directional retraction.
Innovation Solution
A surgical retractor tool with a handle and a blade where the distal portion of the blade has a tissue engaging surface that extends along a distal blade plane, which is obliquely and laterally offset relative to the handle axis, allowing for more versatile tissue engagement and retraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Hohmann blades are configured with fixed directional retraction (handle axis parallel to or intersecting blade retraction axis), then the structure is simple and easy to manufacture, but the adaptability to different surgical directions and anatomical regions is limited
Solution Approach 1:
The patent applies asymmetry by configuring the blade with a proximal portion and distal portion where the distal portion is laterally offset from the proximal portion when viewed from the proximal end. The blade includes a hook portion at the distal end that curves in a direction transverse to the handle axis, creating an asymmetric geometry that enables retraction in multiple directions while maintaining structural integrity
Solution Approach 2:
The patent introduces a lateral dimension to the blade geometry by offsetting the distal portion laterally relative to the proximal portion. This dimensional change allows the blade to engage tissue in directions transverse to the handle axis, enabling multi-directional retraction capability without requiring multiple separate tools
2Ease of operation
If Hohmann blades use conventional straight blade geometry, then manufacturing is simple, but the ability to access deep surgical regions and tightly situated spaces is limited
Solution Approach 1:
The blade is segmented into distinct functional portions: a proximal portion for insertion, a distal portion for tissue engagement, and a hook portion for retraction. This segmentation allows each portion to be optimized for its specific function while collectively enabling access to deep surgical regions through a combination of lateral offset and directional hook configuration
Solution Approach 2:
The hook portion of the blade incorporates curvature that allows it to engage and retract tissue in directions transverse to the handle axis. This curved configuration enables the blade to navigate around anatomical structures and access deep regions that would be difficult to reach with a straight blade geometry
3Object-affected harmful factors
If conventional Hohmann blades are used, then the tool design is simple, but tissue damage occurs more frequently due to less precise tissue engagement
Solution Approach 1:
The blade is designed with different local qualities: the proximal portion has a configuration for insertion and positioning, while the distal portion includes a hook portion with specific curvature for tissue engagement. This local differentiation allows precise control over tissue interaction at the distal end while maintaining simplicity in the proximal portion, reducing overall tissue damage risk
Data Source
AI summary
A surgical retractor tool includes a handle and a blade extending transversely from a front end of the handle. The blade includes a proximal portion and a distal portion with respective proximal and distal tissue engaging surfaces. The distal tissue engaging surface may be skewed relative to the proximal tissue engaging surface such that the handle may be angled relative to a direction of retraction when the surgical retractor tool is used. A distal tip of the retractor may include a curved tongue that may be curved in a direction opposite the direction of retraction.