Vascular Occlusion Device with Mesh Embolic Ribbon
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Solution Overview
Problem
Existing vascular occlusion devices, such as embolic coils, do not provide a sufficient surface area for blood clotting and can have gaps that allow blood to flow freely, increasing the risk of aneurysm rupture, especially in cranial aneurysms.
Innovation Solution
The development of vascular occlusion devices featuring a support wire with radially extending mesh embolic ribbons, which can be twisted into a spiral pattern and configured as a helical coil, providing a larger surface area for clotting and occupying space between adjacent devices without increasing the risk of rupture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If embolic coils are used to occlude aneurysms, then the procedure avoids open brain surgery, but the surface area for blood clotting is insufficient and gaps between coils allow blood flow
Solution Approach 1:
The patent transitions from one-dimensional wire coils to two-dimensional mesh ribbons that extend radially outward from the support wire. This dimensional change dramatically increases the surface area available for blood contact and clotting, directly resolving the contradiction between maintaining procedural simplicity and improving occlusion effectiveness.
Solution Approach 2:
The device combines a support wire framework with mesh ribbon material to create a composite structure. The support wire provides structural integrity and radial support, while the mesh ribbons provide extensive surface area for clotting, achieving both mechanical stability and effective occlusion.
2Area of stationary object
If more embolic coils are deployed to increase packing density, then surface area for clotting increases, but the risk of aneurysm rupture increases
Solution Approach 1:
The mesh ribbons are designed to extend beyond the immediate aneurysm sac into the parent vessel, creating a gradual transition zone. This partial extension provides sufficient clotting surface area within the aneurysm while the gradual taper reduces stress concentration, preventing rupture risk associated with excessive packing density.
Solution Approach 2:
The thin mesh ribbon structure is flexible and conformable, allowing it to adapt to the aneurysm geometry without creating rigid stress points. This flexibility enables adequate surface area coverage while distributing mechanical stresses evenly, reducing the risk of inducing rupture.
3Quantity of substance
If embolic coils are compressed into the aneurysm, then packing density increases, but the coils may not adequately occupy space between adjacent devices
Solution Approach 1:
The radial extension of mesh ribbons from the support wire creates a three-dimensional structure that occupies volume more effectively than linear coils. The ribbons extend outward in multiple directions simultaneously, filling interstitial spaces between adjacent devices and achieving adequate packing density without excessive compression.
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 mesh embolic ribbons increase the surface area for blood clotting and effectively fill the space within the aneurysm, reducing the risk of rupture and improving the packing density, while being flexible and elastic to accommodate pressure without causing high-pressure situations.
Implementation Method 1
the blood clots on the occlusion device and forms a thrombus
Implementation Method 2
The mesh ribbons are preferably flexible and elastic so that the mesh ribbons may yield to pressure from surrounding occlusion devices and/or the wall of the vessel
Data Source
AI summary
A vascular occlusion device that includes a central support member that has at least one mesh embolic ribbon extending outwardly from the central support member in the generally radial direction is provided. The mesh embolic ribbon has a collapsed and an expanded configuration.