Flexible Circuit Adhesion on Renal Nerve Modulation Balloon
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Solution Overview
Problem
Existing renal denervation balloons face issues with delamination and high withdrawal forces during insertion and refolding, leading to inefficient refolding and potential damage during retraction.
Innovation Solution
A renal denervation balloon with flexible circuits adhesively bonded to its exterior surface, featuring selectively applied adhesive on pads and splines to reduce stress and allow free movement, combined with laser-induced micro patterns for enhanced bonding and micro-latching mechanisms to prevent delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flexible circuits are adhesively bonded to the balloon exterior surface, then the circuits remain stable during the procedure, but delamination occurs during insertion and refolding
Solution Approach 1:
The patent applies adhesive selectively to specific regions of the balloon exterior surface rather than uniformly across the entire surface. This localized adhesive application is concentrated at key attachment points where flexible circuits need to be secured, allowing the circuits to remain stable during the procedure while permitting controlled movement during insertion and refolding to prevent delamination
Solution Approach 2:
The adhesive bonding is divided into multiple discrete regions or segments along the balloon surface, with each segment serving a specific function. This segmentation allows different portions of the balloon to have different adhesive properties - some areas with strong bonding for circuit stability, and other areas without adhesive to allow free movement during refolding and retraction
2Strength
If adhesive is applied to secure flexible circuits, then bonding strength increases, but withdrawal forces increase causing damage
Solution Approach 1:
The adhesive is applied in a localized manner at specific attachment points on the balloon surface rather than as a continuous layer. This creates discrete bonding zones with high strength where needed, while leaving other areas free of adhesive to reduce overall withdrawal forces and prevent damage during retraction
Solution Approach 2:
The patent applies adhesive partially rather than completely across the entire contact surface. This partial adhesive application provides sufficient bonding strength to secure the flexible circuits during the procedure, while the absence of adhesive in other areas reduces the total withdrawal force required during insertion and refolding, preventing damage
3Strength
If adhesive is applied to secure flexible circuits, then bonding strength increases, but delamination occurs during refolding
Solution Approach 1:
Adhesive is applied selectively to specific regions of the balloon surface where flexible circuits need to be secured, rather than uniformly across the entire surface. This localized application maintains strong bonding at critical attachment points while allowing other areas to move freely during refolding, preventing delamination
Solution Approach 2:
The adhesive bonding is segmented into discrete regions along the balloon surface, with each segment serving a specific function. This segmentation allows the balloon to refold without causing delamination while maintaining reliable bonding where the flexible circuits need to remain attached
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 reduces delamination and withdrawal forces, enabling efficient refolding and retraction of the balloon, thereby minimizing damage and ensuring robustness during the renal denervation procedure.
Implementation Method 1
adhesive is selectively applied to the outer surface of the balloon, to the flexible circuit or to both such that the adhesive is selectively deposited on the at least a portion of the at least two pads or on the at least a portion of the at least two pads and to a portion of the distal spline
Implementation Method 2
laser-induced micro patterns for enhanced bonding
Data Source
AI summary
A balloon for renal nerve modulation is disclosed. The balloon may include a polymer material forming a balloon wall having an outer surface and flexible circuits comprising a base selectively adhered to the exterior surface of the balloon wall. Adhesive is selectively applied to the outer surface of the balloon, to the flexible circuit or to both such that the adhesive is selectively deposited on the at least a portion of the at least two pads or on the at least a portion of the at least two pads and to a portion of the distal spline. The portion of the at least two pads or the portion of the at least two pads and a portion of the distal spline are adhered to the outer surface of the balloon and a remainder of the flexible circuit moves freely with respect to the outer surface of the balloon.