Endoscope Tool for Bile Duct Access via Papilla Deformation
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Solution Overview
Problem
Current endoscopic procedures for accessing the bile duct from the duodenum face challenges in accurately locating and incising the bile duct due to its non-uniform position and shape, making pre-cutting difficult without clear visual cues.
Innovation Solution
An endoscope treatment tool with a sheath, pressing member, and high-frequency knife that deforms the duodenal papilla tissue, allowing for precise visualization and incision of the bile duct by stretching the tissue and using color indices, along with optional use of indocyanine green for enhanced visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the bile duct is accessed through the papilla opening, then the access route can be formed, but the position and shape of the bile duct are not uniform and vary from person to person, making accurate location difficult
Solution Approach 1:
The pressing member is pressed against the duodenal papilla tissue before incision to deform and flatten the tissue surface in advance. This preliminary deformation creates a consistent reference surface that allows for accurate visualization and location of the bile duct, regardless of its natural position variability.
Solution Approach 2:
The patent utilizes color indices of the mucous membrane (pink), sphincter (white), and bile (yellow) as visual cues to locate the bile duct. By pressing the tissue to create a flat surface, these color differences become more distinct and easier to recognize, enabling accurate identification of the bile duct structure.
2Measurement precision
If shallow incisions are repeated to find the bile duct, then the bile duct can be located, but the process is time-consuming and the incision depth is difficult to control
Solution Approach 1:
The pressing member deforms the tissue surface before incision, creating a flattened reference surface that allows the incision to reach the bile duct in a single controlled motion rather than requiring multiple shallow incisions. This preliminary preparation enables both accurate identification and controlled incision depth simultaneously.
Solution Approach 2:
The visual feedback from color indices (pink mucous membrane, white sphincter, yellow bile) becomes more distinct when the tissue is pressed flat, allowing the operator to immediately recognize the bile duct structure and control incision depth based on real-time visual information without repeated trial incisions.
3Measurement precision
If the tissue is pressed to deform it, then the bile duct becomes visible, but the pressing member must be positioned precisely
Solution Approach 1:
The pressing member serves multiple functions: it deforms the tissue surface to flatten it, provides a reference surface for incision, and helps visualize the bile duct through color contrast. This multi-functionality consolidates several operations into a single positioning action, making the procedure more efficient and less demanding in terms of positioning precision.
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
Facilitates accurate and uniform pre-cutting by clearly visualizing the bile duct and sphincter, reducing the risk of deep incisions and improving the success rate of bile duct access.
Implementation Method 1
deforming a tissue of a duodenal papilla by pressing the treatment tool against the duodenal papilla
Data Source
AI summary
An access route formation method for a bile duct includes: inserting a treatment tool into a duodenum as a target; deforming a tissue of a duodenal papilla by pressing the treatment tool against the duodenal papilla; observing a deformed tissue; and forming an opening in the bile duct located below the deformed tissue by incising the deformed tissue or puncturing the deformed tissue in a state in which the treatment tool is pressed against the deformed tissue.