Electro-Optical Flexible Neural Probes for Tissue-Sparing Recordings
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Solution Overview
Problem
Current microelectrode technologies for measuring neural activity have a large footprint and rigidity, leading to tissue damage and inflammation, which hampers long-term recordings and biocompatibility.
Innovation Solution
Development of multi-modal coaxial microprobes with a minimally invasive footprint, incorporating an optical waveguide with conductive and insulative layers, enabling efficient electrical and optical interrogation of neural networks with negligible inflammatory response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If microelectrode technologies are used for measuring neural activity, then high temporal resolution and individual neuron tracking are achieved, but large footprint and rigidity cause tissue damage and inflammation
Solution Approach 1:
The patent applies flexible shells and thin films by coating the optical waveguide with thin layers of conductive materials (such as iridium oxide and PEDOT:PSS) and insulative materials (such as parylene). These thin film coatings provide the necessary electrical functionality while maintaining the probe's flexibility and minimizing its mechanical footprint, thereby reducing tissue damage while preserving measurement precision.
Solution Approach 2:
The patent employs composite materials by combining the optical waveguide core with multiple functional coatings including conductive materials for electrical recording, insulative materials for isolation, and flexible polymer coatings. This composite structure enables simultaneous optical and electrical interrogation while maintaining mechanical flexibility and biocompatibility, resolving the contradiction between measurement precision and tissue damage.
2Measurement precision
If microelectrode technologies are used for measuring neural activity, then high temporal resolution is achieved, but rigidity leads to inflammation that hampers long-term recordings
Solution Approach 1:
The flexible polymer coatings and thin film structures make the probe mechanically compliant with brain tissue, reducing the immune response and inflammation. This flexibility allows the probe to be tolerated long-term in the tissue while maintaining its electrical and optical measurement capabilities, thus extending recording duration without sacrificing temporal resolution.
Solution Approach 2:
The patent changes the mechanical parameters of the probe by using flexible materials and thin film structures, transforming the probe from a rigid to a mechanically compliant device. This parameter change in mechanical properties reduces tissue damage and inflammation, enabling long-term recordings while preserving the high temporal resolution measurement capability.
3Object-affected harmful factors
If multi-modal coaxial microprobes with minimally invasive footprint are developed, then tissue damage is reduced, but complex manufacturing process is required
Solution Approach 1:
The patent applies segmentation by dividing the probe structure into distinct functional layers: the optical waveguide core, conductive material layers for electrical recording, insulative material layers for isolation, and flexible polymer coatings. This segmented multi-layer structure allows each layer to be optimized independently and deposited using standard sequential coating techniques, making the complex multi-functional probe manufacturable through established processes.
Solution Approach 2:
The patent applies local quality by providing different material properties at different locations and layers of the probe structure. The conductive materials are applied locally where electrical recording is needed, insulative materials are applied where isolation is required, and the optical waveguide core provides optical guidance. This localized functional differentiation enables the minimally invasive footprint while maintaining all necessary functions through a systematic manufacturing approach.
4Adaptability or versatility
If electro-optical mechanically flexible probes are used, then simultaneous electrical recording and optical stimulation are enabled, but device complexity increases
Solution Approach 1:
The patent merges multiple functional modalities into a single coaxial probe structure. The optical waveguide core provides optical stimulation and imaging capabilities, while the surrounding conductive material layers provide electrical recording and stimulation capabilities. By merging these functions into one integrated device with a minimally invasive footprint, the probe achieves multi-modal functionality without proportionally increasing overall device complexity.
Solution Approach 2:
The patent achieves universality by designing a single probe structure that can perform multiple functions: optical waveguiding for stimulation and imaging, electrical recording via conductive coatings, electrical stimulation via the same conductive layers, and mechanical flexibility through polymer coatings. This multi-functional universal probe design enables simultaneous electrical recording and optical stimulation while maintaining a compact structure that does not linearly scale in complexity with added functionality.
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 electro-optical mechanically flexible (EO-Flex) probes allow for simultaneous electrical recording and optical stimulation with minimal tissue response, enabling long-term interfacing with neural circuits and reducing immune reactions.
Implementation Method 1
an optical waveguide including first and second ends and a side surface between the first and the second ends
Implementation Method 2
a first layer including a first electrically conductive material disposed over the side surface of the optical waveguide
Implementation Method 3
an isolation layer including an electrically insulative material disposed the second layer and a remaining portion of the first layer that is not covered by the second layer
Data Source
AI summary
Electro-optical microprobes and methods for forming and using the electro-optical microprobes are disclosed. In one aspect, an electro-optical microprobe includes an optical waveguide including first and second ends and a side surface between the first and the second ends, a first layer including a first electrically conductive material disposed over the side surface of the optical waveguide, a second layer including an electrically conductive polymer disposed on a portion of the first layer proximate to the first end of the optical waveguide, and an isolation layer including an electrically insulative material disposed the second layer and a remaining portion of the first layer that is not covered by the second layer.