Stent Crimping Tool Insert Core Body
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Solution Overview
Problem
Stent crimping tools often result in over-crimping due to mechanical variations, material thickness variances, and environmental conditions, leading to undue strain on stent struts and potential cracking or expansion issues, especially with polymeric stents.
Innovation Solution
A stent crimping tool insert system that includes a core body with a core surface configured to withstand compressive force without diameter reduction, featuring half-pipes that engage and disengage to form a catheter passageway, and a support member with a cylindrical outer surface, which resists the inward movement of crimping surfaces to prevent over-crimping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a stent crimping tool is set or preprogrammed to crimp the stent to a preselected diameter or apply maximum force, then the crimping process can be automated and standardized, but over-crimping may still occur due to mechanical variations, material thickness variances, and environmental conditions
Solution Approach 1:
A core body is introduced as an intermediary component between the crimping tool and the stent. The core body has a core surface that contacts the stent during crimping and is configured to withstand compressive force without deforming. This intermediary ensures precise diameter control by physically limiting the maximum compression, preventing over-crimping even when automated force application varies due to mechanical or environmental factors.
Solution Approach 2:
The invention changes the physical parameters of the crimping interface by introducing a core body with specific dimensional parameters. The core surface diameter is precisely controlled to match the desired stent crimped diameter, and the core body's mechanical properties (compressive strength, rigidity) are optimized to maintain this diameter under crimping forces. This parameter-based approach ensures consistent crimping precision across automated operations.
2Strength
If the crimping tool applies maximum force to ensure adequate crimping, then the stent will be securely crimped, but excessive force may cause cracking of stent struts or other damage
Solution Approach 1:
The core body serves as a protective intermediary that distributes the compressive force uniformly across the stent's circumference. By providing a rigid, dimensionally stable contact surface, it prevents localized stress concentrations that could cause strut cracking. The core body absorbs and distributes the maximum crimping force, allowing adequate crimping strength to be achieved without harmful stress peaks.
Solution Approach 2:
The core body provides beforehand cushioning by being in place before crimping begins. It pre-establishes a protective barrier between the crimping tool and the stent, ready to absorb and distribute forces before they are applied. This prevents sudden force transmission that could cause damage, allowing the crimping process to proceed with maximum force safely.
3Length of moving object
If the stent is crimped to a smaller diameter to fit through small passageways, then the stent can be delivered through the catheter, but reducing the diameter increases the risk of over-crimping and strut strain
Solution Approach 1:
The core body acts as a mediator that enables the stent to be crimped to the necessary small diameter for delivery while preventing excessive reduction. The core surface diameter is precisely controlled to match the minimum required stent diameter, ensuring the stent can be compressed enough to fit through the catheter while maintaining structural integrity and avoiding over-crimping.
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
Prevents over-crimping by maintaining the desired stent diameter, reducing strain on stent struts, and ensuring accurate crimping, thereby enhancing the reliability and safety of stent deployment.
Implementation Method 1
the first half-pipe and the second half-pipe are magnetically attracted to each other
Data Source
AI summary
A stent crimping tool insert comprises a core body configured for insertion into and removal from within a crimping chamber of a stent crimping tool. The core body has a core surface configured to withstand a compressive force without a reduction in diameter of the core surface.