Nanoscale Orifice Electrolytic Sensor for Capacitance Noise Reduction
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Solution Overview
Problem
Conventional ion channel recording systems are limited by high capacitance noise, which restricts sensitivity and bandwidth, making it difficult to measure small and fast ion channel currents effectively.
Innovation Solution
The system employs a nanoscale orifice with reduced substrate capacitance and integrated measurement electrodes to minimize capacitance at the amplifier input, allowing for higher sensitivity and bandwidth by using a substrate with low conductivity and a thick wall structure, and incorporating a high sensitivity electrical readout circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ion channel recording systems are used, then the system can measure ion channel currents, but the measurement is limited by high capacitance noise which restricts sensitivity and bandwidth
Solution Approach 1:
The patent extracts and removes the source of capacitance noise by using a nanoscale orifice with reduced substrate capacitance design. The measurement system separates the sensing function from the bulk substrate, minimizing the capacitive coupling between the amplifier input and the electrolyte solution, thereby extracting only the necessary ionic current signal while leaving out the harmful capacitance.
Solution Approach 2:
The patent applies local quality by creating a localized measurement region at the nanoscale orifice where the substrate capacitance is specifically minimized. The thick-walled substrate material is used locally at the orifice region to reduce parasitic capacitance, while maintaining other necessary properties elsewhere in the system. This localized optimization improves sensitivity without compromising overall system function.
2Speed
If conventional recording systems are used, then ion channel currents can be measured, but the bandwidth is restricted due to capacitance limitations
Solution Approach 1:
The patent extracts the capacitance limitation by designing a measurement system where the substrate capacitance is minimized through the nanoscale orifice geometry. By removing excess substrate material and using thick-walled construction, the harmful capacitive effect is extracted from the measurement path, allowing high-frequency signals to pass through without being filtered out by RC time constants.
Solution Approach 2:
The patent changes the physical parameters of the substrate by using thick-walled construction with low conductivity material. This parameter change reduces the parasitic capacitance formed between the substrate and electrolyte, thereby extending the frequency response of the measurement system and increasing bandwidth for detecting rapid ion channel transitions.
3Measurement precision
If small and fast ion channel currents are measured, then detailed channel behavior can be observed, but conventional systems lack the sensitivity and bandwidth to do so effectively
Solution Approach 1:
The patent replaces conventional mechanical patch-clamp apparatus with a nanoscale orifice-based measurement system. Instead of using large glass pipettes and manual positioning, the system uses a miniaturized solid substrate with integrated nanoscale openings and embedded electrodes. This substitution eliminates the mechanical complexity of patch formation while achieving superior electrical performance for detecting small, fast currents.
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
This configuration significantly reduces internal noise, enabling measurements with improved sensitivity and bandwidth, allowing for the detection of small and rapid ion channel current variations, and facilitating the use of lower bias voltages or electrolyte concentrations.
Implementation Method 1
reduced substrate capacitance
Implementation Method 2
Establishing a potential difference between the first and second electrodes produces an electric field. The electric field causes an ionic current to flow through the one or more orifices
Implementation Method 3
ionic current to flow through the one or more orifices
Data Source
AI summary
An apparatus and method for sensing time varying ionic current in an electrolytic system having a first fluid chamber and a second fluid chamber separated by a barrier structure is provided, wherein the barrier structure includes thick walls and a substrate having an orifice therein, with the first and second fluid chambers being in communication via the orifice. A potential is applied between electrodes in respective first and second fluid chambers, thus driving an electrical current between them and through the orifice. Total capacitance of the system is less than 10 pF. Analytes are added to one of the first and second fluid chambers and time varying ionic current that passes across the orifice is measured. An amplifier proximal to the barrier structure and electrodes amplifies the ionic current signal.