Side-Opening Suction Chamber for Endoscopic Mucosal Resection
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Solution Overview
Problem
Current endoscopic mucosal resection methods are invasive and risk perforation or burns, as they often require suction at the distal end of the endoscope and use flexible snares, which are not as effective for parallel tissue resection.
Innovation Solution
A medical apparatus with a side-opening suction chamber and a rigid electrosurgical wire for transection, along with a flexible, perforated tissue stop to limit tissue depth and reduce perforation and burn risks, allowing for safer and more effective mucosal resection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If suction is applied at the distal end of the endoscope, then tissue can be drawn into the chamber, but the risk of perforation and burns increases
Solution Approach 1:
The suction opening is repositioned from the distal end (perpendicular to long axis) to the lateral side of the endoscope (parallel to long axis). This dimensional change in opening orientation allows the suction chamber to engage tissue from the side rather than the tip, reducing the risk of perforation and burns while maintaining effective tissue engagement for resection.
2Productivity
If flexible electrosurgical snares are used, then tissue can be excised, but the effectiveness for parallel tissue resection is limited
Solution Approach 1:
The cutting element is changed from a flexible snare to a rigid electrosurgical wire. This parameter change in structural rigidity enables the wire to be drawn across or pushed across the chamber opening to excise entrapped tissue, providing superior effectiveness for parallel tissue resection compared to flexible snares.
3Productivity
If no tissue depth limit is provided, then more tissue can be resected, but the risk of alimentary canal perforation increases
Solution Approach 1:
A flexible, electrically conductive tissue stop is introduced as an intermediary element within the suction chamber. This tissue stop limits the depth of tissue that can enter the chamber for resection, providing greater safety by reducing the risk of alimentary canal perforation while still allowing effective resection of the intended tissue volume.
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 apparatus enables less invasive mucosal resection with reduced risk of perforation and burns, improving safety and efficiency by using a side-opening suction chamber and a rigid cutting wire with a conductive tissue stop for precise tissue sampling.
Implementation Method 1
the suction chamber of the present device can open laterally, or on the side of apparatus corresponding to the long axis of the endoscope
Implementation Method 2
an electrosurgical wire can be used for transection
Data Source
AI summary
A medical apparatus and method useful for resecting tissue from the gastrointestinal tract are disclosed. The apparatus can include an RF tissue cutting device disposed inward of a side opening in the device. A tissue stop can be used to control the depth of tissue resected, and the tissue stop can include holes for communicating vacuum for drawing tissue into the side opening. The tissue stop can be electrically grounded with respect to the RF tissue cutting device, and the tissue stop can provide one pole of an RF electrical circuit.