Dual-Blade Tumor Resection Device with Counter-Rotating Cutters
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Solution Overview
Problem
Current surgical instruments for brain tumor removal, such as CUSA and laser knives, often cause unintended damage to surrounding tissues due to their design and operation, leading to potential impairment and the risk of cancerous matter spray during treatment.
Innovation Solution
A surgical cutting device with a dual-blade system comprising an inner and outer blade assembly, where the inner blade is coaxially disposed within the outer blade, allowing for precise cutting and aspiration with minimized collateral damage, featuring a cutting tip and window configuration that reduces tissue drag and promotes clean cuts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CUSA or laser knife is used for tumor removal, then tumor tissue can be removed, but surrounding healthy tissue may be damaged due to high frequency cutting or thermal insult
Solution Approach 1:
The cutting implement is segmented into an inner blade and an outer blade that rotate in opposite directions, allowing each blade to perform complementary cutting functions. The inner blade provides primary cutting while the outer blade reinforces the cut and reduces tissue drag, enabling effective tumor removal with minimal collateral damage to surrounding healthy tissue.
Solution Approach 2:
The inner and outer blades rotate in opposite directions, with the inner blade rotating clockwise and the outer blade rotating counterclockwise. This inverse rotation creates a shearing action that cleanly separates tumor tissue from healthy tissue, reducing thermal insult and mechanical damage to surrounding structures compared to single-direction rotation.
2Productivity
If conventional microdebrider blades are used, then tissue can be removed, but the blade jerks during rotation and tears tissue instead of providing clean cuts
Solution Approach 1:
The cutting implement is divided into two counter-rotating blades with specific geometric features. The inner blade has a distal portion with a first diameter and the outer blade has a distal portion with a second diameter, creating a precise cutting gap. This segmentation allows each blade to be optimized for its specific cutting function, eliminating the jerking motion and tissue tearing associated with conventional single-blade designs.
Solution Approach 2:
The blades are designed with specific diameter parameters and rotational speed parameters that optimize cutting performance. The inner blade rotates at a different speed than the outer blade, and their diameters are precisely controlled to create the desired cutting gap. These parameter changes eliminate the jerking motion and provide clean, precise cuts throughout the cutting process.
3Object-affected harmful factors
If the cutting tip is placed close to tumor tissue for precise removal, then tumor can be removed with minimal damage, but it becomes difficult to visually confirm placement due to the small size of the handpiece
Solution Approach 1:
The cutting implement incorporates visual indicators such as colored bands or markings on the inner and outer blades that are visible through the transparent or translucent distal portion of the outer blade. These color changes or visual markers allow the surgeon to easily confirm the position and orientation of the cutting tip relative to the tumor, even when the handpiece is small and the working area is confined.
4Productivity
If ultrasonic devices are used for tumor removal, then tissue can be destroyed, but cancerous matter spray occurs during treatment
Solution Approach 1:
The device incorporates an irrigation channel that delivers irrigation fluid to the cutting tip and an aspiration pathway that removes debris and cancerous matter during cutting. The irrigation fluid flushes away cancerous matter before it can spray, while the aspiration pathway actively sucks up debris. This pneumatic and hydraulic system effectively controls the spread of cancerous matter during tumor removal while maintaining high productivity.
Data Source
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Figure 3A
AI summary
A cutting device for use with a powered surgical tool includes an outer blade and an inner blade. The outer blade includes a tubular body having side walls, a planar distal end extending at an angle to the side walls, and a cutting window formed in the distal end and the side walls. The inner blade has a distal portion. The distal portion includes a cutting tip having side and end cutting surfaces. The inner blade is co-axially disposed within the outer blade with the cutting tip rotatably exposed at the cutting window. The cutting tip directly contacts the distal end portion of the outer blade.