Biliary Stent Pulling String Fixation for Stable External Anchoring
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional biliary stents with a pulling string cause patient discomfort due to skin irritation and port movement, risk of inflammation, and require reinsertion due to improper expansion of the stent's inner diameter, and are prone to contamination.
Innovation Solution
A biliary stent with a winding and fixing member that securely winds the pulling string to the skin surface using a cover gauze, ensuring stability and preventing contamination, and allows for easy contraction and expansion of the stent by spacing the knot part from the bent end by 3-10 mm, facilitating smooth insertion and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a port catheter is inserted through the skin and biliary tract to secure the pulling string, then the stent can be held in place, but the patient experiences skin irritation, pain, and discomfort during movement
Solution Approach 1:
The patent removes the port catheter component that causes skin irritation and pain by alternative anchoring methods. The pulling string is directly anchored to the stent structure through bent ends and knots, eliminating the need for a separate port catheter that penetrates the skin and causes discomfort while maintaining stent positioning stability.
Solution Approach 2:
The patent combines the anchoring function previously performed by the port catheter into the stent structure itself. The bent ends and knotting mechanism are integrated directly into the stent design, merging the stent and anchoring components into a single unified structure that eliminates the port catheter.
2Reliability
If the pulling string is woven directly adjacent to the bent end to form a knot, then the stent can be securely anchored, but the inner diameter cannot expand properly during medical procedures
Solution Approach 1:
The patent applies different functional qualities to different parts of the pulling string structure. The distal end is woven through the bent end for anchoring, while the proximal portion maintains a specific spacing (3-10mm) from the bent end to allow proper stent expansion. This local differentiation resolves the conflict between anchoring stability and expansion capability.
Solution Approach 2:
The patent pre-establishes the correct spacing between the knot and bent end during the stent assembly process. This preliminary positioning ensures that when the stent is deployed, the inner diameter can expand properly without interference from the knot structure, while still maintaining adequate anchoring stability.
3Ease of operation
If the pulling string is exposed to the outside of the human body for easy access, then the stent can be easily removed, but the pulling string becomes contaminated by the external environment
Solution Approach 1:
The patent introduces a subcutaneous tunnel as an intermediary pathway between the external environment and the pulling string. The pulling string passes through this underground channel formed in the subcutaneous tissue, which acts as a protective barrier against contamination while still allowing external access for stent removal when needed.
4Adaptability or versatility
If the port catheter is allowed to move freely in the human body, then the patient has movement freedom, but the port catheter may cause inflammation or escape causing stent dislodgement
Solution Approach 1:
The patent removes the port catheter component that causes movement-related problems. By anchoring the pulling string directly to the stent through bent ends and knots without using a port catheter, the system eliminates the risks of catheter movement, inflammation, and escape while maintaining adequate patient movement freedom.
Data Source
AI summary
Disclosed is a biliary stent having a winding and fixing member around which a pulling string is wound, and the biliary stent includes a stent having a cylindrical body having space parts and bent ends formed on both ends thereof and configured such that the pulling string is woven with the space parts in zigzags into a circular band, a knot part is formed firmly so as not to be easily loosened, and a medical procedure is performed to expose the pulling string to an outside of a human body so as to prevent the cylindrical body from slipping inside a biliary tract; the winding and fixing member having a main body including an adhesive part so as to be adhered and fixed to a skin surface; and a cover gauze member configured to cover an entirety of the winding and fixing member and the skin surface.