Warp Knit Constrained Device with Multi-Zone Release
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Solution Overview
Problem
Existing minimally invasive delivery techniques for implantable medical devices, such as stents and stent-grafts, face challenges in efficiently constraining and deploying these devices during delivery, as they require precise control over expansion and deployment to avoid excessive force and trauma.
Innovation Solution
A removable constraining device comprising interlocking strands in a warp knit configuration with defined release zones and deployment lines, allowing for simultaneous tensioning to release the device from its constrained state, facilitating controlled expansion and deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single deployment line is used to release the constraining device, then the device structure is simpler, but the control precision over deployment timing and location is insufficient
Solution Approach 1:
The deployment line is segmented into multiple independent strands (first deployment line and second deployment line) that can be tensioned independently. Each deployment line controls a specific release zone, enabling precise control over deployment timing and location while maintaining manageable structural complexity through modular design
2Stability of the object's composition
If the constraining device holds high internal pressure to maintain constrained state, then the device remains stable during delivery, but the force required to deploy the device increases
Solution Approach 1:
The deployment lines are extracted as separate, dedicated elements from the constraining device structure. These deployment lines are specifically designed to counteract the internal pressure holding the constrained state by providing a mechanical advantage system that reduces the force needed to overcome the pressure and initiate deployment
Solution Approach 2:
The constraining device transitions from a static high-pressure constrained state to a dynamic deployment process. The deployment lines enable controlled release by converting the static internal pressure into a dynamic expansion motion, allowing the device to progressively transition from constrained to expanded state with manageable force application
3Ease of operation
If the deployment lines are tensioned simultaneously, then the deployment is more controlled and symmetric, but the operational complexity increases
Solution Approach 1:
The first and second deployment lines are merged into a single lumen of the delivery catheter, allowing both lines to be advanced and tensioned through the same access path. This merging simplifies the delivery mechanism while enabling controlled simultaneous tensioning of both lines for symmetric and balanced deployment of the device
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
Enables controlled deployment of medical devices with a high radial force to deployment force ratio, ensuring safe and effective expansion from a constrained to a deployed diameter, reducing the risk of trauma and improving delivery precision.
Implementation Method 1
a plurality of strands interlocking to form a cover body having a length, the plurality of strands in the form of a warp knit
Implementation Method 2
the first deployment line is configured to release the cover body along the first release zone by tensioning the first deployment line and the second deployment line is configured to release the cover body along the second release zone by tensioning the second deployment line
Implementation Method 3
the medical device to be delivered begins in a diametrically compressed state for delivery and then is expanded (e.g., self-expanding or manually expandable) at a treatment site in the body of a patient
Data Source
AI summary
A removable constraining device, systems, and methods for constraining and delivering an expandable member is disclosed. The removable constraining device includes a plurality of strands interlocking to form a cover body having a length, the plurality of strands in the form of a warp knit, and the plurality of strands including at least a first set of strands and a second set of strands. The removable constraining device also includes a first release zone defined by the first set of strands of the cover body along the length of the cover body and a second release zone defined by the seconds set of strands of the cover body, the second release zone being coextensive with the first release zone along at least a portion of the length of the cover body. The removable constraining device may be released at release zones by substantially simultaneously tensioning deployment lines.