Tissue Resection Device with Straight Edge Opening for Tessellated Cuts
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Solution Overview
Problem
Conventional endoscopic mucosal resection (EMR) tools face challenges in completely removing large areas of tissue without damaging surrounding tissue or muscle layers, often leaving behind potentially diseased tissue that can lead to additional procedures or metastatic cancer.
Innovation Solution
A resection device with a distal end opening featuring at least one straight edge, angled relative to the longitudinal axis, allowing for tessellated cuts that enable complete removal of tissue without overlapping, using a cutting guide with a cap assembly and a cutting device like a wire loop for precise tissue resection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional circular EMR caps are used to remove large areas of tissue, then the risk of perforating the muscularis layer is reduced by avoiding overlapping cuts, but areas between adjacent circular cuts are not removed, leaving potentially diseased tissue behind
Solution Approach 1:
The patent applies asymmetry by transitioning from conventional circular cap geometries to non-circular geometries (rectangular, square, triangular, or irregular shapes with straight edges). This geometric asymmetry enables tessellated cutting patterns where adjacent caps can be positioned edge-to-edge without gaps, allowing complete removal of large tissue areas while maintaining safety margins from the muscularis layer.
Solution Approach 2:
The patent segments the resection process into multiple adjacent rectangular or polygonal sections that can be removed in a systematic tessellated pattern. Each cap removes a discrete geometric section, and multiple sections can be joined edge-to-edge to cover large areas completely, eliminating the gaps that occur with circular cuts.
2Object-affected harmful factors
If multiple separate circular cuts are used to remove large areas of tissue, then the risk of perforation is minimized, but additional procedures are required to remove remaining tissue areas
Solution Approach 1:
By using non-circular caps with straight edges that can be arranged in tessellated patterns, the invention eliminates gaps between adjacent resection areas. This allows complete removal of large tissue areas in a single procedure rather than requiring multiple separate procedures to address residual tissue between circular cuts.
3Ease of manufacture
If conventional circular EMR caps are used, then the device structure is simple and easy to manufacture, but adjacent tissue sections cannot be removed continuously without leaving gaps
Solution Approach 1:
The patent employs non-circular geometries (rectangular, square, triangular) with straight edges that are equally easy to manufacture using conventional techniques but enable continuous tessellated cutting patterns. These geometric shapes can be arranged edge-to-edge like tiles, ensuring continuous removal of adjacent tissue sections without gaps, unlike circular shapes that leave interstitial areas.
Data Source
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AI summary
A device configured to facilitate resection of tissue. The device may include a proximal end configured to be secured to a distal portion of an introduction sheath and a distal end defining an opening that may communicate with a channel extending between the proximal and distal ends. The opening may be defined by at least one straight edge.