Monolithic IC for Simultaneous Neural Recording and Optogenetic Control
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Solution Overview
Problem
Current electrophysiological recording techniques for neural activity are limited in their ability to inhibit action potentials and lack cell type specificity, making it difficult to control complex neuronal functions and neural disorders effectively.
Innovation Solution
An integrated circuit that combines neural recording amplifiers with an optogenetic controller, allowing for simultaneous recording and control of neural activity using light delivered via optical fibers or implantable LED sources, featuring a programmable optical driver and real-time spike sorting unit for precise control of neuronal firing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrical stimulation is used to control neuronal activity, then neural signals can be monitored with precision, but action potentials cannot be inhibited and cell type specificity is lost
Solution Approach 1:
The patent combines electrical recording capabilities with optical stimulation capabilities into a single integrated circuit. The circuit includes both electrophysiological recording functions to monitor neural signals with precision and optogenetic stimulation functions to selectively activate or inhibit specific cell types using light, thereby resolving the contradiction between measurement precision and adaptability.
Solution Approach 2:
The integrated circuit is designed to perform multiple functions: it can record electrophysiological signals, deliver optical stimulation, and control neuronal activity. This multi-functionality allows the system to maintain measurement precision while gaining cell type specificity through optogenetic control, eliminating the need to choose between electrical stimulation limitations.
2Productivity
If external stimulation techniques are used to manipulate neural circuits, then neural signals can be enhanced or interrupted, but control over complex neuronal functions becomes limited
Solution Approach 1:
The patent merges electrophysiological recording and optogenetic stimulation into a single integrated system. This combination enables the circuit to not only monitor neural signals with high precision but also to selectively manipulate specific neuronal populations with cell type specificity, thereby enhancing control over complex neuronal functions while maintaining high productivity in signal manipulation.
3Measurement precision
If conventional recording amplifiers are used, then neural signals can be detected, but simultaneous optogenetic control cannot be achieved
Solution Approach 1:
The patent integrates conventional recording amplifier functionality with optogenetic control capabilities into a single circuit. The amplifier section maintains high input impedance and low noise characteristics for precise neural signal detection, while the integrated optical driver section enables simultaneous optogenetic stimulation or inhibition, achieving both functions without requiring separate external systems.
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
Enables precise control of neuronal activity, allowing for the inhibition or stimulation of specific neurons, overcoming limitations of existing techniques by providing cell type specificity and the ability to detect and counter abnormal neural firing patterns, potentially treating neural disorders.
Implementation Method 1
an interface to receive signals from one or more optrodes measuring a target neuron
Implementation Method 2
a programmable optical driver to control a laser to provide optogenetic stimulation or inhibition of the target neuron
Implementation Method 3
The programmable optical driver may include a laser driver and/or a light emitting diode driver
Data Source
AI summary
Various embodiments of the present technology generally relate to a single monolithic IC to perform simultaneous optogenetic neural inhibition and extracellular electrophysiological recording in-vivo. Some embodiments include a low input capacitance (e.g., 9.7 pF) amplifier particularly tailored for the use of high-impedance electrodes to conduct single neuron extracellular recording integrated with programmable high current drivers for optogenetic stimulation or inhibition on the same IC chip. Some embodiments use a noise model to guide the IC design process to obtain parameters for optimal signal-to-noise ratio. The performance of the IC chip was demonstrated on an anesthetized gerbil expressed with inhibitory optogenetic protein (Halorhodopsin). Spontaneous action potentials from the fifth nerve of the brainstem were recorded by the amplifier and were subsequently inhibited by laser illumination. As a result, various embodiments of the IC allow neuroscience research and neural engineering applications to be conducted in an entirely new direction and can potentially be used in treatments for human mental diseases in the future.