Electro-hydrodynamic Pumping for CTC Capture Selectivity
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Solution Overview
Problem
Current methods for detecting circulating tumor cells (CTCs) are limited by their low abundance and the challenge of distinguishing them from non-target cells and molecules in liquid samples, leading to inefficiencies in capture and detection.
Innovation Solution
A device and method utilizing a fluidic channel with mutually spaced electrodes that are functionalized to selectively bond with target entities, employing electro-hydrodynamic pumping to enhance the selectivity of attachment based on signal parameters such as voltage or frequency, allowing for the efficient capture of CTCs and other biological entities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional microfluidic devices are used to capture CTCs, then device structure is simple, but capture efficiency and selectivity are insufficient due to low abundance of target cells
Solution Approach 1:
The patent replaces conventional mechanical pumping and passive capture mechanisms with electro-hydrodynamic pumping and electric field-based selective capture. The EHD pumping system uses electrostatic forces to generate fluid flow, while the capture mechanism uses electric field-induced dielectrophoresis to selectively concentrate and capture CTCs based on their electrical properties, significantly improving capture efficiency without proportionally increasing mechanical complexity
Solution Approach 2:
The patent changes the operating parameters from passive flow conditions to actively controlled electric field parameters. By adjusting voltage amplitude, frequency, and electrode configuration, the system can dynamically optimize capture efficiency for different target cell types and flow conditions, enabling high selectivity without requiring complex physical structures
2Measurement precision
If non-specific binding occurs between electrodes and cells, then device operation is simple, but detection accuracy decreases due to inability to distinguish target from non-target entities
Solution Approach 1:
The patent applies different functional properties to different regions of the electrode system. The electrodes are configured with specific geometries and spacing that create localized electric field gradients, while surface coatings are applied selectively to enhance specific binding interactions. This spatial variation in electrode properties enables differentiation between target and non-target entities based on their distinct electrical and binding characteristics
Solution Approach 2:
The patent uses dynamically adjustable electric field parameters to differentiate target from non-target entities. By varying voltage amplitude and frequency, the system can selectively enhance binding of target cells while preventing non-specific binding of other cells. The dynamic control of field strength allows real-time optimization of selectivity without requiring complex physical separation mechanisms
3Productivity
If electro-hydrodynamic pumping is applied to enhance fluid flow and mixing, then capture efficiency improves, but energy consumption increases
Solution Approach 1:
The patent employs periodic alternating current (AC) voltage applied to the electrodes to generate electro-hydrodynamic pumping. The alternating electric field creates periodic electrostatic forces that drive fluid flow through the channel. This periodic action is more energy-efficient than continuous direct current (DC) pumping because it leverages the oscillating nature of the field to achieve net fluid transport with lower average power consumption, while still maintaining effective mixing and cell-electrode interaction
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 approach significantly enhances the capture efficiency and specificity of target entities by controlling shear forces and fluid mixing, enabling the detection of rare cells and molecules in complex samples with improved sensitivity and accuracy.
Implementation Method 1
the mutually spaced electrodes are configured to electro-hydrodynamically pump the liquid sample along the fluidic channel on application of a signal to the electrodes
Implementation Method 2
the mutually spaced electrodes are functionalised to selectively bond to the at least one type of target entity and are configured to electro-hydrodynamically pump the liquid sample
Data Source
AI summary
A device for the detection of target entities, the device including: a fluidic channel to conduct a liquid sample containing at least one type of target entity to be detected; and mutually spaced electrodes disposed along the fluidic channel; wherein the mutually spaced electrodes are functionalized to selectively bond to the at least one type of target entity and are configured to electro-hydrodynamically pump the liquid sample along the fluidic channel on application of a signal to the electrodes, such that selectivity of attachment of the at least one type of target entity to the electrodes is determined by at least one parameter of the signal.