Flexible CNS Surface Electrode for Low-Trauma Neural Conformability
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Solution Overview
Problem
Existing surface electrodes for the central nervous system are excessively thick, hard, and inflexible, leading to damage to nerve tissues, limited compatibility with medical imaging, and inadequate signal recording and stimulation capabilities due to mismatched mechanical properties and channel limitations.
Innovation Solution
Development of an ultra-thin and ultra-flexible surface electrode with a multilayer structure, using polymer insulating layers and non-magnetic metals, optimized for minimal invasiveness and compatibility with medical imaging, allowing customizable shape and channel configurations for improved signal acquisition and stimulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional surface electrodes are manufactured using tape casting and chemical deposition methods, then the electrode structure can be formed, but the electrode becomes excessively thick and hard, causing damage to nerve tissues and limited compatibility with medical imaging
Solution Approach 1:
The patent applies thin film technology to replace conventional thick electrode substrates. The electrode uses ultra-thin insulating layers (polyimide or PDMS) with thickness controlled at the micrometer or nanometer level, allowing the electrode to be flexible enough to conform to nerve surfaces without causing mechanical damage, while still maintaining sufficient structural integrity for electrical signal transmission.
Solution Approach 2:
The patent employs composite material structures combining multiple layers with different properties: conductive wire layers (gold, platinum, or their alloys), insulating polymer layers (polyimide, PDMS), and adhesive layers. This composite structure achieves both mechanical flexibility to avoid nerve damage and electrical conductivity for signal transmission, resolving the contradiction between strength and harmlessness.
2Manufacturing precision
If conventional electrodes are made thicker to ensure structural stability, then manufacturing precision can be maintained, but the electrode loses flexibility and cannot be flattened to fit tissue surfaces
Solution Approach 1:
The patent divides the electrode into multiple thin segments or layers rather than using a single thick structure. Each insulating layer is separated by conductive wire layers, creating a segmented multilayer architecture. This segmentation allows each layer to be manufactured with high precision at thin thickness, while the overall structure maintains flexibility and conformability to tissue surfaces.
Solution Approach 2:
The patent fundamentally changes the thickness parameter of the electrode from conventional millimeter or micrometer scale to micrometer or nanometer scale. By controlling the thickness of individual insulating layers at these ultra-thin dimensions, the electrode achieves both manufacturing precision and flexibility, enabling it to be flattened and conform to curved tissue surfaces.
3Ease of manufacture
If conventional electrodes use standard materials and structures, then manufacturing processes are simpler, but the electrode cannot achieve long-term stable signal recording and stimulation due to mechanical mismatch with tissue
Solution Approach 1:
The patent uses flexible thin film structures made from biocompatible materials (polyimide, PDMS, gold, platinum) that can be manufactured using established semiconductor and microfabrication processes. These thin films provide mechanical compliance matching neural tissue, enabling long-term stable contact without causing damage or triggering immune responses, thus achieving both ease of manufacture and long-term reliability.
Solution Approach 2:
The patent employs composite material layers including conductive metals (gold, platinum, nickel-copper) combined with flexible polymers (polyimide, PDMS) and adhesive layers. This composite structure maintains electrical conductivity for signal transmission while providing mechanical flexibility and biocompatibility, ensuring long-term stable operation without compromising manufacturing feasibility.
4Ease of manufacture
If conventional electrodes are designed with fixed structures, then manufacturing is easier, but the electrode cannot be customized for different central nervous system regions or applications
Solution Approach 1:
The patent designs the electrode with modular segmented structures where conductive wire layers, insulating layers, and adhesive layers can be independently configured. This segmentation enables customization of electrode geometry, wire density, and layer thickness to match different CNS regions (cerebrum, spinal cord, peripheral nerves) while maintaining compatibility with standardized manufacturing processes through microfabrication techniques.
Solution Approach 2:
The patent creates a dynamic, adaptable electrode structure where the multilayer configuration can be adjusted to accommodate different application requirements. The electrode can be customized in terms of shape, size, wire arrangement, and thickness to match specific CNS anatomy, while the underlying manufacturing framework remains standardized, enabling flexible adaptation without compromising production efficiency.
Data Source
AI summary
The present disclosure provides a surface electrode for a central nervous system and a method for preparing said electrode. The surface electrode includes: at least one implantable and flexible electrode plate, wherein each of the at least one electrode plate includes: a wire, located between a first insulating layer and a second insulating layer of the flexible electrode; and an electrode site, located on the outer surface of at least one of the first insulating layer and the second insulating layer, and electrically coupled to the wire by means of a through hole in the at least one insulating layer. The surface electrode is configured to be flattened and attached to the surface of the central nervous system biological tissue after implantation.