Segmented Surgical Cutting Device for Fibrous Tissue Resection
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Solution Overview
Problem
Current surgical instruments face challenges in quickly and efficiently removing tumors and fibrous tissues with high collagen content, as they often tear rather than efficiently resecting the tissue, leading to suboptimal debulking results.
Innovation Solution
A surgical cutting device comprising an outer blade with a tubular body and end cap forming a cutting window, and an inner blade with a cutting tip that is coaxially disposed within the outer blade, featuring castellations and radially extending teeth, which is designed to work with a powered surgical tool for effective tissue resection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional surgical cutting instruments are used to resect fibrous tissues with high collagen content, then the tissue can be removed, but the tissue is torn rather than cleanly resected, resulting in suboptimal debulking results
Solution Approach 1:
The cutting device is segmented into an outer blade with a cutting window and an inner blade with a cutting tip. This segmentation allows the inner blade to rotate within the outer blade, creating multiple cutting edges that engage the tissue sequentially, resulting in clean resection without tearing while maintaining high debulking efficiency
Solution Approach 2:
The inner blade is designed to rotate within the outer blade during operation. This dynamic motion allows the cutting tip to engage and resect tissue continuously as it rotates, providing both precise cutting action and high productivity through continuous tissue removal rather than static cutting
2Productivity
If a debulker blade is used to remove tissue, then tissue can be resected, but the blade tears off chunks of tissue rather than providing clean resection
Solution Approach 1:
The inner blade is nested within the outer blade, with the cutting tip of the inner blade rotating within the cutting window of the outer blade. This nested configuration allows the cutting action to occur within a contained space, providing clean resection while the suction system simultaneously removes tissue debris, maintaining both cutting quality and removal efficiency
3Ease of operation
If irrigation fluid is forced between blade members, then tissue can be flushed and aspirated, but tissue drag increases during the cutting process
Solution Approach 1:
The irrigation and aspiration function is extracted as a separate system from the cutting action. Irrigation fluid is delivered to flush tissue toward the cutting window, and a suction system simultaneously removes flushed tissue and excess fluid. This separation allows effective tissue flushing without the irrigation fluid interfering with the cutting action or increasing tissue drag
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device enables efficient resection of fibrous tissues by providing a cutting window with beveled edges and teeth that facilitate smooth cutting and aspiration, significantly improving debulking speed and minimizing tissue drag, as demonstrated by higher resection rates compared to traditional methods.
Implementation Method 1
a mixture of irrigant and resected tissue is drawn down the lumen of the inner blade member via suction and travels from the distal end to the proximal end
Implementation Method 2
applying a lubricating coating to an outer surface of the inner blade
Data Source
Figure 1
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Figure 3A
AI summary
A cutting device for use with a powered surgical tool comprising an outer blade (24) having a distal end (28) having an end cap (128). The end cap is planar and perpendicular to cylindrical sides of the outer blade. A distal cutting window (26) is formed in the end cap and the cylindrical sides, and the distal cutting window is defined by edges (130, 132) having protrusions and window teeth (134). The cutting device comprises an inner blade (20) having a distal portion including a cutting tip (22). The cutting tip includes teeth (116a, 116b) configured in pairs that extend radially toward one another across a first opening and castellations (112a, 112b) that extend parallel to a longitudinal axis of the inner blade toward the end cap of the outer blade. The castellations extend along the distal portion between the first opening and a second opening, and the second opening is circumferentially spaced from the first opening. The inner blade is disposed coaxially within the outer blade along a longitudinal axis with the cutting tip aligned within the cutting window. The window teeth of the cutting window are longitudinally offset from the teeth of the cutting tip.