Telescopic Vascular Occluder for Variable Access Distances
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Solution Overview
Problem
Current transcatheter procedures for cardiovascular abnormalities, particularly caval-aortic access, face challenges such as variable access distances, inadequate hemostasis, and complications from femoral artery access, including vascular complications and limited guidewire access.
Innovation Solution
A telescopic prosthesis design with radially expandable braided mesh bodies connected by a resilient member, featuring a coil spring for axial collapse and radial expansion, and an outer fabric for enhanced hemostasis, along with a delivery system that includes a guidewire lumen and radiopaque markers for precise alignment and deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed-size occluder device is used, then the device structure is simple, but it cannot accommodate variable distances between aortic and caval access ports
Solution Approach 1:
The occluder device incorporates a dynamic telescoping structure with nested components that can extend and retract along the longitudinal axis. The distal and proximal discs are connected by expandable mesh bodies that can change length, allowing the device to adapt to variable distances between access ports while maintaining a compact delivery profile.
Solution Approach 2:
The device employs a nested configuration where the distal disc is positioned within or adjacent to the proximal disc in the compressed state for delivery. The expandable mesh bodies are nested between the discs, allowing compact packaging while enabling extension to variable lengths for different anatomical configurations.
2Reliability
If conventional occluder devices are used, then the device structure is simple, but hemostasis is inadequate due to insufficient sealing against vessel walls
Solution Approach 1:
The occluder device incorporates flexible sealing elements including fabric-covered discs and expandable mesh bodies that can conform to the irregular surfaces of vessel walls. These flexible structures create effective seals by adapting to the anatomical geometry, ensuring hemostasis while allowing for natural vessel movement and pulsation.
Solution Approach 2:
The device utilizes composite construction combining metallic frameworks with fabric coverings and mesh materials. The fabric-covered discs provide enhanced sealing surfaces, while the mesh bodies offer both structural support and sealing capability, creating a multi-material system that achieves superior hemostasis.
3Ease of operation
If the prosthesis cannot be compressed radially, then the structural support is strong, but it cannot be delivered through catheters
Solution Approach 1:
The device employs dynamic structural elements including expandable mesh bodies and collapsible disc configurations that transition from a compressed low-profile state for catheter delivery to an expanded high-strength state for structural support. The mesh materials provide both compressibility during delivery and radial strength when deployed.
4Adaptability or versatility
If the prosthesis is fixed in length, then the manufacturing is simple, but it cannot accommodate different anatomical configurations
Solution Approach 1:
The occluder device incorporates adjustable length mechanisms through telescoping sections and expandable mesh bodies that can be configured to different lengths. The nested disc and mesh construction allows the device to extend or retract to match the specific distance between aortic and caval access ports in each patient, providing anatomical adaptability.
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 solution allows for adjustable and secure closure of vascular openings, improved hemostasis, and reduced vascular complications by accommodating varying anatomies and facilitating precise placement and retention of the prosthesis, enhancing the safety and effectiveness of transcatheter procedures.
Implementation Method 1
featuring a coil spring for axial collapse and radial expansion
Implementation Method 2
radiopaque markers for precise alignment and deployment
Implementation Method 3
radially expandable braided mesh bodies
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 2A~2D
AI summary
The present disclosure provides a variety of prostheses, delivery systems and techniques to facilitate closure of transvascular or transcameral access ports. Various embodiments of prostheses are provided including a plurality of radially expandable discs that can be filled with material to facilitate coagulation and to reduce or stop leakage from punctures in vessel walls.