Strain Relief Intersection Structures for Stretchable Interconnects
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Solution Overview
Problem
Rigid electronic systems are not suitable for applications involving soft and curved biological tissues, as they fail to conform to the delicate and non-two-dimensional nature of biological structures, limiting their effectiveness in medical and non-medical data gathering applications.
Innovation Solution
The development of stretchable interconnects with strain relief structures, embedded in flexible polymers, which allow for effective redistribution of mechanical strain across multiple layers, enabling the electronic systems to stretch up to several hundred percent without micro-crack formation or detachment, and maintaining electrical performance and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If rigid electronic systems are used, then structural integrity is maintained, but adaptability to curved and soft biological tissues deteriorates
Solution Approach 1:
The patent employs flexible polymer substrates and thin-film interconnect structures that can conform to curved and soft biological tissues. The interconnects are designed with serpentine patterns and bypass regions that allow the structure to flex and stretch while maintaining electrical connectivity, enabling adaptation to irregular tissue surfaces without compromising structural integrity.
Solution Approach 2:
The electronic system incorporates dynamic strain relief mechanisms that allow the interconnects to deform elastically under mechanical stress. The serpentine geometry and bypass regions enable the structure to dynamically adjust its shape during stretching or bending, maintaining electrical performance while adapting to the mechanical demands of curved tissue surfaces.
2Adaptability or versatility
If stretchable interconnects are used to improve conformability, then adaptability to curved surfaces improves, but mechanical strain concentration at intersection regions worsens
Solution Approach 1:
The interconnect structure is segmented into multiple functional regions including serpentine sections, bypass regions, and intersection structures. This segmentation allows strain to be distributed across different segments rather than concentrated at single points. The bypass regions act as separate pathways that can accommodate strain independently, reducing stress concentration at intersection regions where multiple interconnects meet.
Solution Approach 2:
The intersection structure serves as an intermediary element between crossing interconnects, providing a strain-relief mechanism that protects the electrical connections. This intermediary structure distributes mechanical loads and prevents direct stress transmission between perpendicular interconnects, maintaining reliability at critical junction points while preserving overall conformability.
3Adaptability or versatility
If multiple layers of stretchable interconnects are used, then device complexity and functionality improve, but strain redistribution requirements and manufacturing difficulty worsen
Solution Approach 1:
The patent implements a multi-layer interconnect architecture where conductive traces are embedded within flexible polymer layers in a nested configuration. Each layer contains complete interconnect patterns that can function independently or in combination with other layers. This nesting approach allows complex multi-layer functionality to be achieved while maintaining manufacturability through sequential fabrication processes.
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
These conformable electronic systems can be stretched significantly without mechanical failure, making them suitable for applications like biomedical devices, wearable electronics, and cardiac catheters, while maintaining electrical performance and structural integrity.
Implementation Method 1
the intersection structure has elastic properties that relieve a mechanical strain on the first bypass region and the second bypass region during stretching of the first conductive stretchable interconnect and/or the second conductive stretchable interconnect
Data Source
AI summary
Intersection structures are provided to reduce a strain in a conformable electronic system that includes multi-level arrangements of stretchable interconnect structures. Bypass regions are formed in areas of the stretchable interconnect structures that may ordinarily cross or pass each other. The bypass regions of the stretchable interconnects are disposed relative to each other such that the intersection structure encompasses at least a portion of the bypass regions of each stretchable interconnect structure. The intersection structure has elastic properties that relieve a mechanical strain on the bypass regions during stretching at least one of the stretchable interconnect structures.