Living Neural Electrodes With ECM Core for Stable Brain Interfaces
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Solution Overview
Problem
Current Brain Machine Interface (BMI) strategies using penetrating microelectrode arrays and optogenetics suffer from impermanence, non-specificity, and a significant foreign body response due to non-organic electrodes, leading to diminished recording and stimulation quality.
Innovation Solution
Development of implantable living electrodes comprising a cylindrical extracellular matrix core with spheroidal aggregates of aggregated neurons, designed to promote axon growth and integration with host neurons, providing a biocompatible and specific stimulation/recording interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-organic electrodes are used for BMI, then recording and stimulation can be achieved, but foreign body response increases and recording quality diminishes over time
Solution Approach 1:
The patent uses an extracellular matrix core as an intermediary between the non-organic electrode and host tissue. This matrix, composed of biocompatible materials like collagen and laminin, mediates the interaction by providing a natural interface that reduces foreign body response while maintaining electrical conductivity for recording and stimulation functions.
Solution Approach 2:
The electrode construct employs composite materials combining non-organic conductive elements with organic biocompatible extracellular matrix materials. This composite structure integrates the electrical functionality of synthetic materials with the biocompatibility of natural materials, resolving the contradiction between recording capability and foreign body response.
2Adaptability or versatility
If penetrating microelectrode arrays are implanted, then direct neural communication is achieved, but the solution is impermanent and lacks specificity
Solution Approach 1:
The extracellular matrix is pre-assembled with neurotrophic factors and growth cues before implantation. This preliminary preparation creates a pre-conditioned environment that actively promotes neuronal migration, axon growth, and synaptogenesis, enabling permanent integration rather than temporary placement.
Solution Approach 2:
The patent modifies the chemical and physical parameters of the implant interface by using soft, compliant extracellular matrix materials with specific mechanical properties matching brain tissue. This parameter change from rigid to soft materials enables long-term integration without mechanical mismatch damage, achieving permanence.
3Measurement precision
If non-specific stimulation is used, then broad neural activation occurs, but targeting precision is reduced
Solution Approach 1:
The extracellular matrix is functionalized with specific molecular cues and neurotrophic factors at localized regions to guide axonal growth toward specific targets. This local quality enhancement creates directional specificity in neural integration, allowing precise targeting while maintaining efficient synaptic formation at the desired location.
Data Source
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AI summary
In one aspect, the invention comprises an implantable living electrode comprising a substantially cylindrical extracellular matrix core; one or more neurons implanted along or within the substantially cylindrical extracellular matrix core, the one or more neurons including one or more optogenetic or magnetogenetic neurons proximal to a first end of the implantable living electrode.