Self-Expandable Vascular Device Radial Force Control
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Solution Overview
Problem
Current devices for treating vasculature and bodily ducts, such as stents and flow diverters, are inadequate for effectively addressing aneurysms, stenoses, and embolic obstructions, requiring improved methods and devices for deployment and retrieval within the body.
Innovation Solution
A self-expandable vascular treatment device with a plurality of cell structures that transition from a compact delivery position to a radially expanded position, featuring a proximal end portion, cylindrical main body portion, and distal end portion, allowing for deployment within bodily ducts or vasculature, and a method for embolic obstruction removal using a delivery catheter and elongate flexible wire with a self-expandable member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a self-expandable member with cell structures is used to treat vasculature and bodily ducts, then the device can effectively address aneurysms, stenoses, and embolic obstructions, but the device complexity increases compared to traditional stents and flow diverters
Solution Approach 1:
The self-expandable member is divided into multiple cell structures arranged in a pattern along its length, with each cell capable of independent expansion and contraction. This segmentation allows the device to effectively address complex vascular pathologies while maintaining a modular structure that can be manufactured and deployed systematically
Solution Approach 2:
The self-expandable member is designed to perform multiple functions including treating aneurysms through radial expansion, addressing stenoses through vessel support, and removing embolic obstructions through engagement and retrieval mechanisms, replacing the need for multiple specialized devices
2Ease of operation
If the self-expandable member is designed to transition from a compact delivery position to a radially expanded position, then the device can be delivered through tortuous anatomy and deployed at the target site, but the device length increases to accommodate both compressed and expanded states
Solution Approach 1:
The self-expandable member is designed to nest within itself or within the delivery catheter during the compressed delivery state, allowing it to pass through tortuous anatomy and delivery systems. Upon deployment, the nested structure expands radially to provide full therapeutic effect at the target site without requiring excessive device length
3Stability of the object's composition
If the cell structures in the main body portion extend circumferentially around the longitudinal axis, then the device provides uniform radial support and engagement, but the device rigidity increases making navigation through tortuous anatomy more difficult
Solution Approach 1:
The cell structures are designed to be dynamic, transitioning from a flexible compressed state during delivery to a stable expanded state at the target site. The circumferential arrangement provides uniform radial support when expanded, while the ability to compress reduces rigidity during navigation through tortuous anatomy
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 device enables effective deployment and retrieval of embolic obstructions by exerting radial force to engage and remove obstructions, while maintaining flexibility for navigation through tortuous anatomy and allowing for retraction into a delivery catheter, enhancing treatment efficacy for aneurysms and stenoses.
Implementation Method 1
an elongate self-expandable member movable from a first delivery position to a second placement position, in the first delivery position the expandable member being in an unexpanded position and having a nominal first diameter and in the second position the expandable member being in a radially expanded position and having a second nominal diameter greater than the first nominal diameter
Data Source
AI summary
A clot retrieval device including a self-expandable member having a proximal end portion and a main body portion. The self-expandable member is expandable from a first delivery position to a second placement position. In the first delivery position the expandable member has a first overall diameter In one implementation the cell structures that form the self-expandable member have dimensional and material characteristics that result in about a −1.0N to about a −1.7N overall reduction in radial force along the length of the expandable member per millimeter of expansion during about an initial 0.50 mm diametric range of expansion from the first overall diameter and that results in about a −0.10N to about a −0.35N overall reduction in radial force along the length of the expandable member per millimeter of expansion during subsequent diametric ranges of expansion.