Bioactive Cochlear Implant Electrode Array with Neurotrophin Gradient
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Solution Overview
Problem
Current cochlear implant technologies face challenges in noisy environments and decoding intonation and music due to the 'electrode-neuron gap', which limits the ability to establish effective synaptic connections between transplanted stem cell-derived neurons and endogenous spiral ganglion neurons.
Innovation Solution
A bioactive implant with an electrode array coupled with a polyhedrin delivery system that generates a brain-derived neurotrophic factor (BDNF) concentration gradient, facilitating neuronal differentiation and directed neurite outgrowth of human pluripotent stem cell-derived spiral ganglion neurons, thereby establishing a neuro-regenerative nexus that bridges the electrode-neuron gap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional cochlear implant electrode array is used to stimulate auditory neurons, then hearing restoration is achieved, but the electrode-neuron gap causes current spread that disables neighboring electrodes and reduces information channels
Solution Approach 1:
The patent introduces an extracellular matrix (ECM) coating as an intermediary substance between the electrode array and auditory neurons. This ECM layer acts as a mediator that reduces the electrode-neuron gap, enabling more direct and efficient electrical coupling without causing current spread to neighboring electrodes, thereby preserving information channels while maintaining hearing restoration effectiveness
Solution Approach 2:
The patent modifies the physical and chemical parameters of the electrode surface by coating it with ECM materials. This changes the electrical impedance and surface properties of the electrode, creating optimal conditions for neuronal attachment and signal transmission, which reduces the excitation field required and prevents current spread
2Reliability
If larger CI excitation fields are used to bridge the electrode-neuron gap, then neuron stimulation is improved, but current spread increases that disables neighboring electrodes
Solution Approach 1:
The ECM coating serves as an intermediary that enhances the coupling efficiency between the electrode and neuron. This allows for smaller excitation fields to achieve the same neuronal stimulation effect, thereby preventing current spread to neighboring electrodes while maintaining reliable neuron activation
Solution Approach 2:
The patent replaces the reliance on high-intensity electrical fields with a biochemical-mechanical interface through the ECM coating. The ECM provides physical and chemical cues that facilitate direct neuronal attachment and signal transmission, substituting the need for large excitation fields with a more efficient biological interface
3Reliability
If transplanted hPSC-derived SGNs are used to bridge the electrode-neuron gap, then synaptic connections may be established, but the gap width of hundreds of μm prevents sufficient directed neurite outgrowth
Solution Approach 1:
The patent applies ECM coating to the electrode array before implantation, creating a pre-prepared biological interface that guides and supports neurite outgrowth. This preliminary preparation of the electrode surface provides immediate structural and chemical cues to transplanted neurons, facilitating their navigation across the electrode-neuron gap and establishment of synaptic connections
Solution Approach 2:
The ECM coating acts as an intermediary scaffold that spans the electrode-neuron gap. This biological matrix provides physical support and chemical guidance cues that facilitate directed neurite extension across the hundreds of micrometers gap, enabling transplanted hPSC-derived SGNs to establish synaptic connections with the electrode array
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 solution reduces electrical impedance and current requirements, enabling more precise neurite growth and synaptogenesis, potentially enhancing cochlear implant performance in decoding complex auditory signals.
Implementation Method 1
generating a neurotrophin concentration gradient that facilitates a neuro-regenerative nexus
Data Source
AI summary
In one aspect, this invention relates to a bioactive implant comprising an electrode array; and a source of neurotrophins coupled with the electrode array for generating a neurotrophin concentration gradient that facilitates a neuro-regenerative nexus (NRN) for survival, neuronal differentiation toward spiral ganglion neurons (SGNs), and directed neurite extension of human pluripotent stem cell (hPSC)-derived SGNs. The invention in another aspect also relates to a method for realization of the NRN in conjunction with an implant, comprising coupling a source of neurotrophins with the electrode array to generate a neurotrophin concentration gradient that facilitates the NRN for survival, neuronal differentiation toward SGNs, and directed neurite extension of hPSC-derived SGNs.