Resilient Coupling Assembly for Controlled Stent Release
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Solution Overview
Problem
Conventional stent engagement members face challenges such as requiring multiple pad diameters for different stent sizes, leading to manufacturing complexities, and issues with stent engagement persisting after deployment, especially in tortuous vessels, causing incomplete expansion and retrieval difficulties.
Innovation Solution
A medical device delivery system featuring a coupling assembly with engagement and release members that allow for stent expansion and prevent unintended engagement, using resilient materials and spacers to facilitate smooth delivery and deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional engagement members with multiple pad diameters are used for different stent sizes, then stent engagement is achieved, but manufacturing complexity increases
Solution Approach 1:
The engagement member is designed with a single pad diameter that can engage multiple stent sizes through the resilient member's ability to deform and adapt. The resilient member allows the engagement pad to conform to different stent outer diameters, eliminating the need for multiple fixed-diameter pads while maintaining engagement capability across various stent sizes.
Solution Approach 2:
The resilient member enables dynamic change in the engagement pad's effective diameter through elastic deformation. When force is applied, the resilient member deforms to accommodate different stent sizes, allowing a single engagement member design to adapt to varying stent dimensions without requiring multiple discrete components.
2Ease of operation
If conventional engagement members are used in tortuous vessels, then stent delivery is attempted, but engagement persists after deployment causing incomplete expansion
Solution Approach 1:
The resilient member provides dynamic engagement that can be controlled through axial force application. During delivery, the resilient member remains compressed to maintain engagement. Upon deployment, releasing the axial force allows the resilient member to expand and disengage from the stent, ensuring complete stent expansion without persistent engagement even in tortuous vessels.
Solution Approach 2:
The resilient member is pre-compressed during the delivery phase to maintain engagement through tortuous vessel sections. This preliminary compression state allows the system to navigate complex vasculature while keeping the stent engaged, and the subsequent release of this compression ensures clean disengagement for complete deployment.
3Ease of operation
If conventional engagement members are used in tortuous vessels, then stent delivery is attempted, but retrieval becomes difficult
Solution Approach 1:
The resilient member's dynamic compression and expansion properties enable controlled engagement during delivery and easy disengagement during retrieval. By applying axial force to compress the resilient member, the stent remains engaged for delivery through tortuous vessels. For retrieval, releasing the axial force allows the resilient member to expand and release the stent, facilitating straightforward retrieval without difficulty.
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 system enables efficient stent delivery and deployment, reducing manufacturing complexity and ensuring complete expansion and retrieval, even in complex vasculature, by using a coupling assembly with resilient members and spacers to manage stent engagement and expansion.
Implementation Method 1
a resilient member positioned about the core member, wherein the resilient member is movable between a first state in which an outer diameter of the resilient member is smaller than the outer diameter of the engagement member and a second state in which the outer diameter of the resilient member is at least as large as the outer diameter of the engagement member
Data Source
AI summary
Medical device delivery devices, systems, and methods are disclosed herein. According to some embodiments, a medical device delivery system includes a core member and a coupling assembly positioned about the core member. The coupling assembly may include an engagement member having projections configured to engage a medical device and a release member that is movable between a compressed configuration and an expanded configuration. A medical device can extend along the core member such that, when the release member is in the compressed configuration, the projections of the engagement member engage the medical device and when the release member is in the expanded configuration, the release member prevents the projections from engaging the medical device and/or facilitates expansion of the medical device.