Endoscopic Tissue Resection Cap with Ligation Bands
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Solution Overview
Problem
Conventional endoscopic mucosal resection (EMR) techniques face challenges in accurately and efficiently removing sessile polyps without damaging deeper tissue layers, often resulting in complications like perforation, bleeding, and incomplete tissue removal due to the difficulty in grasping flat polyps and ensuring adequate tissue clearance.
Innovation Solution
A tissue resection cap assembly is designed for attachment to an endoscope, featuring a cap structure with ligation bands and a resection device channel, allowing for precise deployment of ligation bands and a resection loop to capture and cut polyps while minimizing the risk of damaging deeper tissue layers, with the capability to deploy multiple ligation bands for repositioning and sequential tissue capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional EMR techniques are used to remove sessile polyps, then tissue removal can be achieved, but the risk of damaging deeper tissue layers increases and complete tissue clearance is difficult to ensure
Solution Approach 1:
The cap assembly is positioned and secured to the endoscope distal end before the resection procedure begins. The ligation bands are pre-positioned on the cap structure and deployed in advance to capture the polyp, establishing a secure framework before cutting occurs. This preliminary setup ensures accurate positioning and prevents damage to deeper tissue layers during the subsequent resection.
2Reliability
If ligation bands are deployed to capture polyps, then tissue can be held securely for resection, but the complexity of the device increases
Solution Approach 1:
The ligation bands are integrated directly into the cap structure, merging the functions of the cap and the ligation mechanism into a single unified component. The bands are positioned on the outside surface of the cap structure and deployed via trigger lines, eliminating the need for separate ligation devices and reducing overall system complexity while maintaining secure polyp capture capability.
3Manufacturing precision
If multiple ligation bands are used for sequential tissue capture, then complete tissue removal can be achieved, but the procedure time increases
Solution Approach 1:
Multiple ligation bands are pre-positioned on the cap structure in advance, ready for sequential deployment. This preliminary arrangement allows the operator to deploy multiple bands in rapid succession without repositioning or reconfiguring the cap assembly between deployments, significantly reducing procedure time while ensuring complete tissue removal through sequential capture of multiple polyp segments.
Data Source
AI summary
A tissue resection cap assembly configured to be secured to the distal end of an elongated medical device, such as an endoscope, and a method for resecting tissue. The cap assembly may include a cap structure comprising a working channel and a resection device channel, wherein the resection device channel extends inside the cap structure to a resection device track positioned substantially around the working channel adjacent the distal end of the cap structure. The resection device channel is adapted to direct a resection device from the working channel of the endoscope to the resection device track. The cap assembly further includes one or more ligation bands on the outside surface of the cap structure and a trigger line for deploying the ligation bands from the distal end of the cap structure. The method includes deploying a ligation band around tissue and using a resecting loop to cut the tissue.