Embolic Coil Proximal End Inversion for Kick-Back Prevention
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Solution Overview
Problem
Existing embolic coils often experience 'kick-back' into the parent vessel after deployment, leading to potential disruption of blood flow and thrombosis due to the proximal end protruding into the parent vasculature.
Innovation Solution
The design of embolic coils with a proximal end that retracts into a secondary shape, such as a cone, cylinder, or sphere, upon deployment within the vasculature, ensuring accurate placement and preventing protrusion into the parent vessel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If embolic coils are deployed to achieve adequate density for embolus formation, then the treatment effectiveness is improved, but the proximal end protrudes into the parent vessel causing kick-back
Solution Approach 1:
The proximal end of the coil is designed to invert its configuration after deployment. Instead of protruding outward as in conventional coils, the proximal end bends back inward toward the coil body, reversing the typical outward expansion pattern and preventing kick-back into the parent vessel while maintaining embolus formation effectiveness
2Ease of operation
If the proximal end of the coil is designed to extend for delivery, then the delivery through catheter is facilitated, but the proximal end protrudes into the parent vessel after release
Solution Approach 1:
The coil is designed with dynamic shape-changing capabilities. The proximal end transitions from an extended linear configuration during delivery to a bent-inward configuration after release. This dynamic transformation allows the coil to maintain deliverability through the catheter while automatically preventing protrusion into the parent vessel upon deployment
3Reliability
If multiple embolic coils are implanted to achieve adequate density, then the embolus formation is improved, but the risk of thrombosis increases due to kick-back
Solution Approach 1:
By inverting the proximal end configuration, the coil eliminates kick-back that would otherwise disrupt blood flow and cause thrombosis. This allows multiple coils to be implanted to achieve adequate embolus density without proportionally increasing thrombosis risk, as each coil's inverted design prevents harmful blood flow disruption
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
This solution effectively prevents the proximal end from extending into the parent vasculature, maintaining blood flow and reducing the risk of thrombosis by allowing the coil to retract into a defined volume, ensuring precise placement and functionality within the target site.
Implementation Method 1
The coil is then wrapped around a larger, secondary mandrel, and heated to impart a secondary shape... the primary shape is formed into a secondary shape in which a free energy state of the secondary shape
Data Source
AI summary
The present disclosure relates to embolic coils that eliminate kick-back into a parent vessel by providing a proximal end that retracts following deployment within the vasculature. Also disclosed are methods of making such coils, delivery systems that comprise such coils, and methods of delivering such coils to a patient.