Marking coils for stents with polymer fixation
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Solution Overview
Problem
Existing thrombectomy devices face challenges in maintaining visibility and proper placement during procedures with antegrade blood flow, leading to potential emboli dislodgment and increased risk of strokes and vessel occlusions due to the water-hammer effect of blood flow on marking devices.
Innovation Solution
The development of enhanced marking systems for braided stents and self-expanding devices with adjustable diameters and improved coil placement, secured by polymer coils, and covered with materials like PTFE or metal, to enhance visibility and retention of thrombi during thrombectomy procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If marking coils are used on stents for visibility during thrombectomy procedures, then visibility of the device is improved, but the marking coils may be dislodged by the water-hammer effect of blood flow
Solution Approach 1:
The marking coil is divided into multiple segments or loops that are distributed along the stent structure. This segmentation allows the marking coil to better conform to the stent geometry while maintaining visibility, and reduces the risk of dislodgment by distributing the mechanical stress across multiple points rather than a single continuous coil.
Solution Approach 2:
The marking coil is nested within or integrated with the stent structure, with the coil positioned inside the stent lumen or along the stent struts. This nesting ensures that the marking coil remains secured to the stent during procedures, preventing dislodgment while maintaining visibility through the stent framework.
2Ease of operation
If marking coils are secured to stents using traditional methods, then placement is simplified, but the coils lack sufficient fixation and may become dislodged
Solution Approach 1:
The marking coil is pre-formed and pre-positioned on the stent during manufacturing, with the coil already secured in the correct position and orientation. This preliminary action eliminates the need for complex intra-procedural placement maneuvers while ensuring proper fixation, as the coil is already in its final position before the procedure begins.
Solution Approach 2:
A polymer coating or layer is applied as an intermediary between the marking coil and the stent structure. This polymer layer enhances the bonding between the coil and stent, providing sufficient fixation to prevent dislodgment during procedures, while the coating material itself remains compatible with blood flow and does not interfere with the marking function.
3Adaptability or versatility
If the stent diameter is made adjustable for different vessel sizes, then adaptability is improved, but the marking system becomes more complex
Solution Approach 1:
The marking coil is designed to be dynamic rather than static, allowing it to expand and contract with the stent diameter adjustments. The coil structure can dynamically adapt to different vessel sizes while maintaining its marking function, eliminating the need for multiple fixed-size marking systems or complex reconfiguration mechanisms.
Solution Approach 2:
The marking coil is designed with universal applicability across different stent diameters and vessel sizes. The coil structure and positioning mechanism work effectively regardless of the specific diameter, providing a single marking system that serves multiple functions and adapts to various procedural requirements without increasing complexity.
Data Source
AI summary
Improved systems using marking coils are attached to stents and flow diverters and related thrombectomy systems at ends by polymer/coil or directly and can be two/three/four or any number needed.