Biliary Stent Unit With Soft Tube And Pulling String
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Solution Overview
Problem
Biliary stents often separate from the diseased part of the biliary tract due to body or external forces, causing increased stimulus and pain due to the rigidity of the port catheter used in existing biliary stent units.
Innovation Solution
A biliary stent unit featuring a cylindrical body with superelastic shape memory alloy wires, a flexible soft tube to protect the pulling string, a cap with a female thread to secure the string on the skin, and a fixing member to prevent exposure and contamination, allowing for easy removal and reduced stimulus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hard port catheter is used to fix the pulling string, then the stent can be securely positioned, but stimulus inside the human body increases due to body shaking or external force
Solution Approach 1:
The patent replaces the hard port catheter with a soft tube made of flexible material that has a lumen through which the pulling string passes. This flexible shell allows the tube to accommodate body movements and external forces without transmitting rigid stimulus to the internal structures, thereby reducing pain while still providing secure positioning of the stent through the pulling string mechanism.
2Ease of operation
If the pulling string is exposed outside the human body, then it can be easily pulled for stent removal, but contamination risk increases
Solution Approach 1:
The patent introduces a cap as an intermediary component that covers the pulling string at its external exit point. The cap has a through-hole through which the pulling string passes, allowing the string to remain accessible for removal operations while the cap itself acts as a protective barrier that prevents contamination of the pulling string and surrounding area.
3Object-affected harmful factors
If a soft tube is used to protect the pulling string, then internal stimulus is reduced, but the structure becomes more complex
Solution Approach 1:
The patent combines multiple functions into the soft tube structure: it serves as both a protective element to reduce internal stimulus and as a guiding structure that leads the pulling string from the external cap back to the stent inside the body. This merging of protective and guiding functions into a single component minimizes overall structural complexity while achieving the desired stimulus reduction.
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 biliary stent unit effectively prevents separation from the diseased part, reduces internal stimulus, and facilitates easy removal by guiding the stent through a soft tube, while preventing contamination and bile discharge during removal.
Implementation Method 1
a stent having a cylindrical body, which has several spaces formed by twisting or crossing wires made of a superelastic shape memory alloy in a hollow cylindrical net shape
Implementation Method 2
a soft tube in which the pulling string, which is fixed to the hook pulled out of the human body by pulling of the pulling rod, is inserted
Data Source
AI summary
Proposed is a biliary stent unit having a pulling string that is fixed to the skin of a human body to prevent a stent from separating from a diseased part of the biliary tract, and having a soft tube that reduces stimulus in the human body after a surgery because it has flexibility.