Stimulus Responsive Polymer Flexures for Foldable 3D Structures
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Solution Overview
Problem
Current 3D printing technologies are limited in creating materials that can be controllably folded or shaped after manufacturing, lacking access to inner cavities and allowing only limited modifications to shape or configuration, which hinders the production of high-resolution, biocompatible structures like implantable probes that require precise 3D geometry responsive to external stimuli.
Innovation Solution
The development of spatio-temporal stimulus-responsive foldable structures with substrates featuring engineered weaknesses and Stimuli Responsive Polymer (SRP) flexures, which can be actuated by external stimuli such as light, heat, or magnetic fields to bend or fold into predetermined 3D shapes, integrating microfabrication and additive manufacturing techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If 3D printing techniques are used to create structures, then manufacturing capability and complexity are improved, but the ability to controllably fold or reshape after manufacturing is lost
Solution Approach 1:
The substrate is divided into multiple regions with different mechanical properties - rigid regions for structural support and flexible regions for folding. This segmentation allows the structure to maintain overall integrity while enabling controlled folding at specific locations through the flexible regions that can be actuated by stimuli.
Solution Approach 2:
The structure transitions from a static 3D printed form to a dynamic system that can change shape in response to external stimuli. The flexible regions incorporate stimuli-responsive materials that allow the structure to adapt its configuration after manufacturing, enabling post-manufacturing shape modification while maintaining the manufactured precision of the rigid portions.
2Ease of operation
If traditional Origami folding is used, then controlled shaping capability is improved, but manufacturing precision and resolution are limited
Solution Approach 1:
Manual or mechanical folding operations are replaced with stimuli-responsive actuation. The flexible regions contain materials that respond to external stimuli (thermal, optical, chemical, or electrical) to induce folding automatically, eliminating the need for precise mechanical manipulation while achieving high-resolution folding patterns defined by the manufactured substrate geometry.
Solution Approach 2:
The mechanical properties of the flexible regions are engineered to be stimuli-responsive, allowing the same physical structure to exhibit different degrees of flexibility and folding behavior under different conditions. This enables precise control of folding parameters (timing, sequence, degree of folding) through stimulus control rather than mechanical force application.
3Adaptability or versatility
If stimulus-responsive materials are added to enable folding, then adaptability is improved, but device complexity increases
Solution Approach 1:
The structural and functional elements are merged into a single integrated substrate. The flexible regions serve dual purposes: they provide the structural framework for folding while simultaneously containing the stimuli-responsive materials that enable actuation. This eliminates the need for separate actuator components and reduces overall device complexity.
Solution Approach 2:
The flexible regions are designed to perform multiple functions: they provide mechanical flexibility for folding, contain stimuli-responsive materials for actuation, and serve as the interface between the rigid manufactured structure and the external environment. This multi-functionality reduces the number of separate components needed and simplifies the overall device architecture.
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
Enables the creation of high-resolution, biocompatible 3D structures that can be controllably folded into complex shapes, providing access to inner cavities and allowing for precise modifications, suitable for medical applications like implantable neural interfaces with programmable folding sequences and materials that can absorb energy without damage.
Implementation Method 1
A stimulus responsive polymer (SRP) flexure may be included which is disposed at the region of engineered weakness. The SRP flexure is responsive to a predetermined stimulus actuation signal to bend or fold in response to exposure to the stimulus actuation signal
Implementation Method 2
materials that can absorb energy without damage
Data Source
AI summary
The present disclosure relates to a spatio-temporal stimulus responsive foldable structure. The structure may have a substrate having at least a region formed to provide engineered weakness to help facilitate bending or folding of the substrate about the region of engineered weakness. The substrate is formed to have a first shape. A stimulus responsive polymer (SRP) flexure is disposed at the region of engineered weakness. The SRP flexure is responsive to a predetermined stimulus actuation signal to bend or fold in response to exposure to the stimulus actuation signal, to cause the substrate to assume a second shape different from the first shape.