Warp Knit Constraining Fiber for Controlled Stent Deployment
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Solution Overview
Problem
Existing delivery systems for stents and stent-grafts face challenges in preventing premature deployment due to the radial force exerted by constrained devices, which can lead to unintended expansion during delivery.
Innovation Solution
A constraining mechanism using warp knit patterns with interwoven fibers, featuring knots with additional loop portions to resist premature deployment, allowing controlled release and deployment of medical devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a simple constraining mechanism is used to hold the medical device, then the device can be easily deployed, but premature deployment occurs due to insufficient resistance against stored radial force
Solution Approach 1:
The constraining mechanism is segmented into multiple knitted loops arranged in series along the constraining fiber. Each loop acts as an independent constraint element that must be sequentially overcome for deployment to occur. This segmentation increases the complexity of the constraining mechanism while significantly improving reliability by preventing premature deployment through cumulative resistance.
Solution Approach 2:
The knitted loops are pre-configured in a constrained state during manufacturing, creating stored resistance that must be overcome before deployment. The loops are arranged and tensioned in advance to provide progressive resistance against the radial force of the medical device, ensuring that deployment only occurs when sufficient force is deliberately applied.
2Ease of operation
If multiple knitted loops are used to prevent premature deployment, then deployment control is improved, but the mechanism becomes more complex
Solution Approach 1:
The single constraining fiber performs multiple functions by forming both the structural framework and the deployment control mechanism. The same fiber that provides the constraining structure also provides the controlled deployment function through its knitted loop configuration, eliminating the need for separate control mechanisms and reducing overall system complexity.
Solution Approach 2:
The knitted loops are designed to dynamically transition from a constrained state to a deployed state. The loops can elastically deform and reconfigure under applied force, allowing the mechanism to adapt its resistance characteristics during deployment. This dynamic behavior enables controlled deployment while maintaining structural integrity throughout the process.
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 warp knit constraining mechanism effectively prevents premature deployment by increasing the required displacement for unknitting, ensuring precise and controlled deployment of stents and stent-grafts at target locations.
Implementation Method 1
the at least one constraining fiber include a first series of loops forming the warp knit with at least one of the first series of loops including a first portion forming a knot and a second portion arranged in addition to the knot
Implementation Method 2
the first portion forming a knot and a second portion arranged in addition to the knot
Implementation Method 3
at least one of the first series of loops including a first portion forming a knot
Data Source
AI summary
Various aspects of the present disclosure are directed toward medical device deployment apparatuses, systems, and methods. The apparatuses, systems, and methods may include at least one constraining fiber configured to form a warp knit surrounding a medical device with a first series of loops forming the warp knit with at least one of the first series of loops including a first portion forming a knot and a second portion arranged in addition to the knot.