Endoscopic Accessory Channel With Slit-Based Large Specimen Retrieval
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Solution Overview
Problem
Current endoscopic retrieval methods are limited by the diameter of the endoscopic channel, requiring removal and reinsertion of the endoscope for specimens larger than the channel diameter, increasing patient risk and prolonging procedures.
Innovation Solution
A multifunctional accessory channel device with a slit-enabled tube attached to an endoscope, allowing specimens larger than the channel diameter to be retrieved externally without removing the endoscope, using a secondary instrument like a net.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the endoscope channel diameter is used to retrieve specimens, then the endoscope structure remains simple, but specimens larger than the channel diameter cannot be retrieved without removing the endoscope
Solution Approach 1:
The accessory channel device is nested within the endoscope channel, with the tube containing a slit that allows specimens to pass through externally. The retrieval net is inserted through the proximal opening of the tube, and the slit opens to allow the net to pass through the tube wall and engage with specimens in the lumen, then closes behind the net. This nested configuration enables large specimen retrieval without modifying the endoscope itself.
Solution Approach 2:
The accessory channel device is divided into separate functional components: the tube with its slit, the retrieval net, and the attachment mechanisms at proximal and distal ends. The slit itself is segmented into openings that can be independently controlled to allow net passage and specimen engagement. This segmentation allows each component to perform its specific function while maintaining overall system simplicity.
2Productivity
If the endoscope is removed and reinserted to retrieve large specimens, then specimens can be retrieved, but patient trauma increases and procedural time is prolonged
Solution Approach 1:
The accessory channel device is prepared and attached to the endoscope before the procedure begins. The tube is positioned within the endoscope channel, and the slit is pre-configured to allow net insertion. During specimen retrieval, the net is inserted through the proximal opening, the slit opens to allow net passage, and the device is ready to engage specimens immediately without requiring endoscope removal. This preliminary preparation eliminates the need for repeated endoscope removal and reinsertion.
3Adaptability or versatility
If the endoscope is removed and reinserted multiple times for multiple specimens, then each specimen can be retrieved, but the procedure is prolonged and specimen loss risk increases
Solution Approach 1:
The accessory channel device enables continuous specimen retrieval without interrupting the endoscopic procedure. After the first specimen is retrieved through the slit and net mechanism, the slit closes behind the net, and the endoscope remains in position. The same device can be used to retrieve subsequent specimens by repeating the net insertion and slit opening sequence, maintaining continuous useful action throughout the procedure without time-consuming endoscope removal and reinsertion cycles.
Data Source
AI summary
A multifunctional accessory channel device is disclosed. The device comprises a tube, a proximal adapter for attachment of the tube to a control section of an endoscope, and a distal adapter for attachment of the tube at or near a distal tip of an endoscope. The tube has a slit that is reversibly locally openable along the length and the depth of the slit by translation of a portion of an accessory through and along the slit but is otherwise fully closed. The tube has a distal end shaped as a notch. The device allows for removal of large specimens from the body of a patient by use of an endoscope without need for removing the endoscope from its position within the body. The device also serves as a secondary channel, allowing for use of other endoscopic instruments or for accessory suction.