Bending Distal End for Selective Bile Duct Cannulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional endoscopic treatment instruments face challenges in selectively cannulating branch sections of luminal tissues, such as the bile duct, due to difficulties in navigating the duodenal papilla and maintaining contact with the inner wall, requiring high skill and often resulting in inaccurate placement and reduced success rates.
Innovation Solution
The endoscopic treatment instrument features a bending-movement section at its distal end, capable of bending to make contact with the inner wall of the common duct at two opposing points, allowing for stable insertion and navigation through the duct's curvature, facilitating precise cannulation into the bile duct without requiring excessive skill.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional endoscopic treatment instrument is used for selective cannulation, then the procedure requires high skill and has low success rate, but using a more complex instrument with bending capability increases device complexity
Solution Approach 1:
The instrument is divided into distinct functional sections: a rigid proximal section for stability and control, and a flexible distal section with bending capability for navigation. This segmentation allows the instrument to combine ease of manipulation with the ability to navigate complex anatomical paths, thereby improving cannulation success rate without requiring excessive overall complexity
Solution Approach 2:
The distal end of the instrument incorporates a bending mechanism that allows dynamic adjustment of the tip orientation. This dynamic capability enables the operator to adapt the instrument's shape to match the anatomical curvature of the duct system, improving the reliability of selective cannulation while maintaining a relatively simple overall device structure
2Ease of operation
If the distal end of the instrument is made rigid for stable insertion, then navigation through duct curvature becomes difficult, but making it flexible reduces contact stability with the inner wall
Solution Approach 1:
The instrument shaft is segmented into rigid and flexible portions, allowing the proximal rigid section to provide stable contact and support while the distal flexible section navigates curvatures. This segmentation resolves the contradiction by assigning different mechanical properties to different sections of the same instrument
Solution Approach 2:
The distal end incorporates a flexible sheath or membrane structure that can bend and conform to the duct curvature while maintaining continuous contact with the inner wall. This flexible structure allows navigation through curves without sacrificing contact stability, as the flexibility enables adaptation to the anatomical path while maintaining wall apposition
3Measurement precision
If the instrument is designed to contact the inner wall at multiple points for stability, then the structure becomes more complex, but single-point contact simplifies the structure while reducing accuracy
Solution Approach 1:
The bending mechanism at the distal end allows the instrument to dynamically conform to the duct anatomy and make contact at multiple points along its length. This dynamic adaptation achieves accurate placement and stable multi-point contact without requiring complex mechanical structures, as the flexibility itself provides the necessary contact geometry
Data Source
AI summary
A selective cannulation method for a lumenal tissue's branch section includes: a first step for guiding an endoscope having a channel to an aperture section of the lumenal tissue; a second step for inserting a distal end of an endoscopic treatment instrument through the channel into the aperture section of the lumenal tissue; a third step for having the distal end of the endoscopic treatment instrument make contact with a pipe wall extending from the aperture section of the lumenal tissue to the branch section at two opposed points on the pipe wall by deforming the distal end of the endoscopic treatment instrument; a fourth step for sliding and moving the distal end of the endoscopic treatment instrument to the branch section while having the distal end of the endoscopic treatment instrument make contact with the pipe wall; and a fifth step for inserting the distal end of the endoscopic treatment instrument into a predetermined branch lumen divided from the branch section.