Microstructured Electroadhesion Interface for Tissue-Safe Implant Contact
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Solution Overview
Problem
Existing microstructured devices fail to effectively utilize high field gradients on a micrometer scale for electroadhesion without causing electroporation or electrofusion of tissue, and they struggle with imperfect dielectric contact, leading to suboptimal adhesion forces and potential tissue damage during surgical procedures.
Innovation Solution
The development of electro-microstructured devices with hierarchical microstructures and embedded electrodes that generate localized electric fields, creating Wenzel-Cassie interfaces and altering surface energy gradients to achieve strong adhesion without frictional damage, using a combination of monopolar and bipolar electrode configurations and spatially periodic patterns to enhance electroadhesive forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large electrodes with macroscopically uniform electromagnetic fields are used, then therapeutic effect on tissue is achieved, but electroporation and electrofusion of tissue occur causing damage
Solution Approach 1:
The patent divides the electrode surface into microscale segments (micrometer-scale features) rather than using large macroscopic electrodes. This segmentation creates localized high field gradients at microfeatures while maintaining overall field uniformity, achieving therapeutic effects without tissue damage from excessive field strength
Solution Approach 2:
The patent applies different field characteristics to different spatial scales: microscale high field gradients for therapeutic effect at the tissue interface, while macroscale field uniformity prevents bulk tissue damage. The microstructured surface creates localized quality differences in field distribution
2Force
If high field gradient is applied to achieve strong electroadhesion, then adhesion force is improved, but electroporation and electrofusion of tissue occur
Solution Approach 1:
The electrode is segmented into microscale features that concentrate electric field gradients locally at each microfeature, generating strong electroadhesive forces at the tissue interface without requiring high overall field strength that would cause tissue damage
Solution Approach 2:
The patent transitions from macroscopic field uniformity to microscopic field gradient variation, adding a spatial dimension (micrometer scale) to field distribution. This dimensional change allows high local field gradients for adhesion while maintaining low average field strength for tissue safety
3Force
If conventional electroadhesion is used, then adhesion force is generated, but imperfect dielectric contact reduces effectiveness and causes frictional damage
Solution Approach 1:
The microstructured surface segments the contact interface into numerous micrometer-scale contact points, increasing overall contact area and improving dielectric contact effectiveness while reducing stress concentration and frictional damage at any single point
Solution Approach 2:
The microstructured electrode surface creates a porous or textured interface that improves dielectric contact with tissue, allowing better electric field penetration and electroadhesion while the microstructure reduces direct frictional contact and potential damage
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 devices achieve strong, reversible adhesion to both conductive and non-conductive surfaces without causing tissue damage, leveraging hierarchical microstructures and controlled electric fields to optimize electroadhesive forces and prevent electroporation, thus improving surgical precision and reducing post-surgical complications.
Implementation Method 1
The microstructured device may include at least one of a Wenzel or Cassie wetting state which may be altered by charging an electrode and wherein charging the electrode may generate an electroadhesive state
Implementation Method 2
surfaces can undergo modification of the surface's wetting properties with an applied electric field, which is known as electrowetting
Implementation Method 3
the formation of composite hydrophilic/hydrophobic domains known as Wenzel-Cassie interfaces
Implementation Method 4
fields generated as described below in more detail are on a micrometer scale, they do not cause electroporation and electrofusion of tissue. Thus, high field gradient does not equate with high energy density on microscales
Data Source
AI summary
A microstructured device is disclosed utilizing Coulomb field modification of surface energy and electroadhesion to localize a device surface or to levitate a device surface with respect to a target surface. The surface energy modification can be permanent or reversible depending on whether the charge is externally delivered to the device or derived on the device galvanically. The microstructure aspect of the device induces various hydrophilic/hydrophobic interactions with the target surface. The Coulomb field can be used to enhance or decrease the hydrophilic/hydrophobic interactions. In combination, the disclosed electro-microstructured device provides for localizing implants in a mammalian body, and additionally means for controlling cell interaction with the implant.