Stent Inflow Prevention Surface for Bile Duct Backflow
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing stents for bile and pancreatic ducts fail to effectively prevent the backflow of food residue and bile flow obstruction, leading to inefficiencies in bile drainage and potential complications.
Innovation Solution
A stent design featuring an umbrella section with bony and membranous portions that form an inflow prevention surface, covering the second opening section with gaps to prevent backflow, and a valve unit at the base end to manage bile flow, ensuring efficient bile drainage while preventing food residue entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the second opening section is provided at the base end portion to communicate with the internal space, then bile drainage efficiency is improved, but food residue may enter and cause backflow obstruction
Solution Approach 1:
The inflow prevention surface is positioned to cover the second opening section before food residue can enter, creating a preliminary barrier that prevents backflow while allowing bile to drain through the gaps in the surface
Solution Approach 2:
The inflow prevention surface has a specific structure with gaps that provides different properties for different functions: the surface covers the opening to prevent food residue entry, while the gaps allow bile fluid to pass through for drainage
2Object-affected harmful factors
If the inflow prevention surface covers the second opening section, then food residue entry is prevented, but bile flow may be obstructed
Solution Approach 1:
The inflow prevention surface is designed with gaps that function as a porous structure, allowing bile fluid to pass through while blocking larger food particles, thus maintaining both prevention and drainage functions simultaneously
3Productivity
If a valve unit is added at the base end to manage bile flow, then bile drainage control is improved, but device complexity increases
Solution Approach 1:
The valve unit is integrated into the base end portion of the stent, combining multiple functions including bile flow regulation, structural support, and coordination with the inflow prevention surface to reduce overall device complexity while maintaining control capabilities
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 stent effectively prevents the backflow of food residue and ensures efficient bile drainage by utilizing the umbrella section's gaps and the valve unit, reducing the burden on patients during insertion and maintaining patency of the bile duct.
Implementation Method 1
each having a first end section formed of a material having elasticity and fixed closer to the base end than the second opening section, and a second end section extending toward the front end in a natural state and spaced apart from a circumferential surface of the major axis member outward in the radial direction
Data Source
AI summary
A stent includes a major axis member which has an internal space extending from a front end portion toward a base end portion, first opening section provided at the front end portion to communicate with the internal space, and second opening section provided at the base end portion to communicate with the internal space, and inflow prevention section which has an inflow prevention surface covering the second opening section with a gap with respect to the second opening section, wherein a first edge section of the inflow prevention surface is fixed to the major axis member closer to a base end than the second opening section, and a second edge section of the inflow prevention surface is disposed closer to a front end than the second opening section and extends from a side surface of the major axis member toward a position spaced apart therefrom outward in a radial direction.