Wire-Structured Ureteral Stent for Anti-Blockage Urine Flow
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Solution Overview
Problem
Conventional ureteral stents made from polyurethane are prone to failure due to blockage of through holes by proliferative tissues, leading to impaired fluid guiding performance.
Innovation Solution
A ureteral stent design featuring an outer structure made from a first wire, which can be elastic or a memory alloy, and an inner structure with fluid guiding gaps, allowing the stent to maintain urine flow even when compressed, preventing tissue blockage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional polyurethane pigtail stents with through holes are used, then high radial strength and structural stability are achieved, but the through holes become blocked by proliferative tissues leading to fluid guiding failure
Solution Approach 1:
The patent replaces the rigid polyurethane structure with a flexible wire-based outer structure that can deform elastically. This flexible wire structure maintains radial strength while allowing the material to move and adapt, preventing tissue proliferation blockage of fluid channels.
Solution Approach 2:
The patent changes the material parameter from rigid polyurethane to elastic wire materials (such as nitinol or stainless steel wires). This parameter change enables the stent to exhibit elastic deformation characteristics, allowing it to expand and contract while maintaining structural integrity and preventing tissue ingrowth into fluid channels.
2Stability of the object's composition
If the outer structure is made from rigid polyurethane, then structural stability is maintained, but the stent cannot deform adequately for proper placement and support
Solution Approach 1:
The patent creates a composite structure combining an inner support structure with an outer wire-based structure. The inner structure provides structural stability while the outer wire structure provides deformability and flexibility, allowing the stent to maintain stability when needed while deforming for placement and support.
Solution Approach 2:
The patent transitions from a static rigid structure to a dynamic elastic structure. The outer wire structure can dynamically deform in response to forces applied during placement and then return to its original shape, providing adaptability while maintaining structural stability during use.
3Reliability
If through holes are provided in the stent wall, then fluid guiding performance is improved, but the holes are blocked by proliferative tissues after prolonged use
Solution Approach 1:
The patent extracts the traditional through-hole design and replaces it with a wire-based structure where fluid channels are formed by the arrangement and spacing of the wires themselves. This eliminates the need for discrete through holes that can be blocked, as the fluid channels are integrated into the structural framework.
Solution Approach 2:
The patent uses a porous wire-based structure where the spacing between wires creates inherent fluid channels. This porous structure prevents tissue proliferation blockage because the wires themselves form the channels rather than requiring separate through holes, allowing prolonged service life while maintaining fluid guiding performance.
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 design effectively reduces stent failure by ensuring continuous urine flow and preventing tissue blockage, maintaining effective fluid guiding capabilities.
Implementation Method 1
the first wire may be an elastic thread
Implementation Method 2
the first wire may be a memory alloy thread
Implementation Method 3
the knitted second wire may be provided with fluid guiding gaps for fluid guiding therein
Data Source
AI summary
A ureteral stent and a manufacturing method of a ureteral stent are applied to the technical field of medical instruments, to effectively reduce ureteral stent failure in fluid guiding. The ureteral stent comprises an inner structure (200), and an outer structure (100) sleeved on the inner structure (200), wherein the outer structure (100) is a tube-shaped structure, and the outer structure (100) is made from a first wire (110). The ureteral stent can effectively reduce ureteral stent failure in fluid guiding.