Stent Deploying with Rotation to Reduce Expansive Force
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Solution Overview
Problem
Conventional stent systems for retrieving blood clots from blood vessels have limitations in capturing and removing clots effectively, leading to lower retrieval rates and potential damage to the vascular wall due to high expansive forces and rigidity.
Innovation Solution
A stent designed to deploy while rotating and swinging when pushed out of a catheter, with a structure comprising rings and coiled elements that allow for radial compression and expansion, reducing expansive force per unit length to 0.05 N/mm or less, enhancing clot capture and retrieval efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the stent has high expansive force to ensure adequate vessel wall support, then the stent can maintain its position and provide structural support, but the risk of vascular wall damage increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the expansive force parameter to be 0.05 N/mm or less per unit length. This quantitative parameter optimization allows the stent to provide adequate structural support while minimizing the risk of vascular wall damage, resolving the contradiction between strength and harmful effects.
Solution Approach 2:
The stent is designed with dynamic deployment characteristics, rotating and swinging during expansion to adapt to the vascular structure. This dynamic behavior allows the stent to achieve proper positioning and support with reduced expansive force, thereby lowering the risk of vascular wall damage while maintaining structural integrity.
2Strength
If the stent is designed with high rigidity to maintain structural integrity, then the stent can resist deformation and provide stable support, but the flexibility to conform to complex vascular structures decreases
Solution Approach 1:
The stent incorporates dynamic deployment characteristics with rotation and swinging motions that enable it to adapt to complex vascular structures during expansion. This dynamic design maintains structural integrity while achieving flexibility in conforming to various vessel geometries.
Solution Approach 2:
The stent structure includes multiple segments or units that can move relative to each other during deployment, allowing the overall structure to maintain integrity while adapting to complex vascular shapes through coordinated segmental motion.
3Strength
If the stent uses conventional high expansive force design, then the stent can ensure adequate vessel wall support, but the blood clot retrieval rate decreases due to potential clot damage
Solution Approach 1:
The patent optimizes the expansive force parameter to 0.05 N/mm or less per unit length, which is sufficient for vessel wall support while minimizing damage to captured blood clots. This parameter optimization directly improves the blood clot retrieval rate by preventing clot fragmentation during stent expansion.
Solution Approach 2:
The stent design incorporates a controlled expansion mechanism that gradually applies force, cushioning the impact on captured blood clots. This prior cushioning approach prevents sudden force application that could damage the clot structure, thereby improving retrieval success rates.
4Reliability
If the stent is designed to rotate and swing during deployment, then the blood clot capture ability improves, but the device complexity increases
Solution Approach 1:
The stent utilizes intrinsic dynamic properties of its structure to enable rotation and swinging during deployment without requiring additional active control mechanisms. The dynamic behavior emerges from the stent's geometric design and material properties, improving clot capture while avoiding excessive device complexity.
Solution Approach 2:
The stent's rotation and swinging during deployment occur automatically as a result of the deployment process itself, without requiring separate control systems or additional actuators. This self-service dynamic behavior enhances clot capture capability while maintaining relatively simple device architecture.
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 achieves a higher blood clot retrieval rate with reduced risk of vascular wall damage and improved flexibility, allowing for effective capture and removal of blood clots while conforming to complex vascular structures.
Implementation Method 1
a stent (11) configured to be inserted into a catheter (12) and to be pushed out of the catheter (12)
Implementation Method 2
the stent (11) having an expansive force of 0.05 N/mm or less per unit length
Data Source
AI summary
The stent has an expansive force 0.05 N/mm or less per unit length when it has a diameter equal to the lower limit diameter of the target blood vessel and is measured under the following conditions. A radial force testing system manufactured by Blockwise Engineering LLC is used as a tester. The test conditions include a temperature of 37° C.±2° C. in the chamber of the tester; a stent diameter of 0.5 mm for start of test, and a rate of increase of diameter of 0.5 mm/s in the tester. The test method includes radially compressing the stent disposed in the chamber; recording an expansive force while gradually increasing the diameter of the chamber at the rate of increase of diameter; and dividing the expansive force by the effective length of the stent to calculate an expansive force per unit length.