Packing Coil With Open And Closed Loops For Neurovascular Stability
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Solution Overview
Problem
Current neuro-embolic microcoils lack stability and versatility for deployment in varying target sites, limiting their efficacy and application in occluding body cavities and blood vessels.
Innovation Solution
A microcoil design featuring a relaxed configuration with a combination of closed and open loop portions, formed from biocompatible materials like platinum and Nitinol, allowing for improved stability and space-seeking ability within target sites of varying sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional microcoil designs are used, then the device can be deployed in blood vessels, but the coil lacks stability and is prone to displacement and fragmentation
Solution Approach 1:
The microcoil is divided into multiple loop portions (open loops, closed loops, and combinations) along its length, allowing each segment to contribute differently to stability and occlusion. The segmented structure prevents uniform displacement and reduces fragmentation risk compared to traditional uniform coils.
Solution Approach 2:
The microcoil incorporates both open and closed loop portions that can dynamically adapt to the target site geometry. The open loops provide flexibility for navigation and deployment, while the closed loops provide structural stability once deployed, creating a dynamic balance between adaptability and stability.
2Adaptability or versatility
If traditional microcoil designs are used, then the device can occlude blood vessels, but the coil lacks versatility for varying target site sizes
Solution Approach 1:
The microcoil design incorporates multiple loop configurations (open, closed, and combinations) that can adapt to various target site geometries and sizes. This multi-functional structure allows a single coil design to effectively occlude different types of vascular defects including aneurysms, fistulas, and defects, enhancing versatility without compromising occlusion reliability.
Solution Approach 2:
The microcoil can be manufactured with varying proportions of open to closed loops, different wire diameters, and different loop sizes to match specific target site requirements. These parameter variations allow the same basic design to be optimized for different anatomical locations and defect sizes while maintaining reliable occlusion.
3Ease of manufacture
If simple coil designs are used, then the manufacturing process is straightforward, but the coil lacks space-seeking ability within target sites
Solution Approach 1:
The coil is manufactured as a continuous wire formed into segmented loop portions, maintaining manufacturing simplicity while achieving space-seeking ability. The segmentation is achieved through controlled forming processes that create open and closed loops in sequence, allowing the coil to naturally seek and fill three-dimensional target spaces without complex assembly.
Solution Approach 2:
The combination of open and closed loops creates a three-dimensional structure that can seek and fill complex spatial configurations within target sites. The open loops provide radial expansion capability while closed loops maintain structural integrity, enabling the coil to effectively occupy and occlude irregular three-dimensional vascular defects.
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 microcoil design enhances stability and efficacy by maintaining a deployed configuration within target sites, preventing displacement and fragmentation, and accommodating a range of anatomical sizes for effective occlusion.
Implementation Method 1
A packing coil is disclosed having a relaxed configuration comprising a plurality of open loop portions interposed between a plurality of closed loop portions
Implementation Method 2
These microcoils may be made of biocompatible metal alloy(s) (typically a radio-opaque material such as platinum or tungsten)
Data Source
AI summary
An occlusion device formed of a microcoil having a three-dimensional relaxed state employing open looped portions interposed between closed loop portions. Planes defined by sequentially formed open looped and closed loop portions are neither coincident nor parallel to one another.