Micro Device for Neural Stimulus Delivery and Recording
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Solution Overview
Problem
Current neural recording techniques struggle to deliver chemical stimuli with high spatial and temporal resolution, making it difficult to analyze neural network reconfiguration, plasticity, and behavior in vitro, as existing methods either activate all receptors or lack control over timing and distribution of stimuli.
Innovation Solution
A micro device with a chamber and electrode system that allows for precise delivery of chemical stimuli using laminar flow and adjustable guide fluids to target specific regions of brain tissue, enabling high spatial and temporal control over stimulation and recording.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a chemical bath is used to stimulate brain tissue, then all relevant receptors are activated, but spatial resolution is lost and it becomes difficult to ascertain underlying cellular mechanisms
Solution Approach 1:
The device segments the chemical stimulus delivery system into multiple independently controllable channels, each targeting specific regions of the brain tissue slice. This allows selective activation of different receptor populations while maintaining spatial resolution, resolving the contradiction between comprehensive coverage and precise localization.
Solution Approach 2:
The device implements local quality by enabling different chemical stimuli to be delivered to different regions of the tissue simultaneously through the multi-channel system. Each channel can provide tailored chemical composition and concentration to specific areas, allowing precise investigation of cellular mechanisms while maintaining comprehensive stimulus coverage.
2Manufacturing precision
If microinjection technique is used to localize chemical stimulus, then spatial resolution is improved, but control over timing and distribution of chemical stimulus is lost
Solution Approach 1:
The device introduces dynamic control through independently adjustable flow rates and timing for each channel, allowing real-time modulation of stimulus delivery. This enables precise control over when and where chemicals are delivered while maintaining the spatial localization benefits of microinjection techniques.
Solution Approach 2:
The device uses hydraulic flow control mechanisms to regulate the timing and distribution of chemical stimuli through the microchannels. By controlling fluid pressure and flow rates, the system achieves precise temporal and spatial control over stimulus delivery, resolving the limitation of static microinjection techniques.
3Quantity of substance
If large electrodes are used to record neural activity, then recording of large populations of nerve cells is achieved, but spatial precision and control are reduced
Solution Approach 1:
The device segments the recording function into multiple small electrodes arranged in an array, where each electrode can record from specific neuronal populations. This segmentation allows simultaneous recording from many cells while maintaining spatial precision, as each electrode's location can be precisely controlled and assigned to record from特定 regions.
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 recording and stimulation of neural activity with high spatial and temporal resolution, allowing for detailed analysis of neural networks and potential discoveries in learning, memory, and motor control.
Implementation Method 1
The first and second guide fluids and the stimulation fluid flow along corresponding axial flow paths in laminar flow
Implementation Method 2
A pulse fluid flows between the output of the output portion of the first pulse channel and the input of the output portion first pulse channel
Data Source
AI summary
A micro device and method are provided for examining and testing a slice of a biological object, such as brain tissue. The micro device includes a body defining a chamber and a channel in communication with the chamber. A stimulation fluid flows axially along a flow path in the channel and engages a user selectable region of the slice. An array of electrodes in the chamber engages the slice and allows for the multi-channel electrical recording and stimulation of the slice at each of the electrode sites.