Eccentric Cone Guidewire Capture Sheath
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Solution Overview
Problem
Existing guidewire capture devices struggle to efficiently direct a guidewire from one direction into a catheter while maintaining blood flow and minimizing vessel obstruction during vascular procedures.
Innovation Solution
A guidewire capture sheath with an eccentrically oriented cone or petal-like members that can expand and collapse, allowing for the guidewire to be funneled into the catheter while maintaining a larger cross-sectional area to accommodate blood flow, utilizing shape memory materials or temperature-sensitive materials for automatic expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a capture means is expanded to a larger cross-sectional area to facilitate guidewire capture and direction, then the guidewire capture efficiency is improved, but the obstruction to blood flow in the vessel increases
Solution Approach 1:
The capture means is designed to dynamically change its cross-sectional area, expanding when needed for guidewire capture and collapsing when not in use to maintain blood flow. This dynamic transformation allows the device to adapt its configuration based on operational requirements, resolving the contradiction between capture efficiency and blood flow obstruction.
Solution Approach 2:
The capture means is divided into multiple collapsible segments or elements that can be independently controlled to expand or collapse. This segmentation allows the structure to transform from a compact low-profile state during navigation to an expanded high-profile state for guidewire capture, then back to compact state to restore blood flow.
2Object-affected harmful factors
If the capture means is kept in a collapsed state to minimize vessel obstruction, then blood flow is maintained, but the ability to effectively direct the guidewire into the catheter is reduced
Solution Approach 1:
The capture means transitions from a collapsed low-profile configuration during vessel navigation to an expanded high-profile configuration when guidewire capture is required. This dynamic state change allows the device to optimize for different operational phases: minimal obstruction during transit and maximal capture capability during the capture maneuver.
Solution Approach 2:
The capture means is preliminarily positioned in a collapsed state for safe navigation through the vessel, then expanded at the precise moment and location where guidewire capture is needed. This preliminary positioning strategy ensures that the device is ready to capture when required while minimizing obstruction during the majority of the procedure.
3Productivity
If the capture means is designed with a larger cross-sectional area for better guidewire capture, then the capture effectiveness is improved, but the device complexity and difficulty of deployment increase
Solution Approach 1:
The capture means is designed in a nested configuration where the expanded capture structure is contained within a delivery catheter in a collapsed state. This nesting allows the complex expanded structure to be delivered through a relatively simple catheter system, reducing deployment complexity while maintaining capture effectiveness when the structure is expanded.
Solution Approach 2:
The capture means utilizes dynamic transformation mechanisms such as shape memory alloys or balloon expansion to transition from a simple collapsed delivery state to a complex expanded capture state. This dynamic approach allows the device to achieve high capture effectiveness only when needed, while maintaining simplicity during delivery and reduces overall device complexity.
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
Effectively captures and directs the guidewire into the catheter without obstructing blood flow, ensuring downstream cellular and physiologic needs are met during the procedure, and allows for easy deployment of subsequent catheters like graft deploying catheters.
Implementation Method 1
utilizing shape memory materials or temperature-sensitive materials for automatic expansion
Implementation Method 2
utilizing shape memory materials or temperature-sensitive materials for automatic expansion
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
The present invention relates to a device and a method for capturing a guidewire being progressed along the lumen of a bodily duct and to direct it into a catheter. In one aspect a catheter-based eccentric cone capture means is used to engage and direct a guidewire oppositely approaching the capture means.