Microfluidic Device with Dissolvable Matrix for Blood Cell Detection
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Solution Overview
Problem
Current assays for detecting analytes in liquid samples are limited in their ability to efficiently process and analyze bodily fluids, particularly in detecting specific cells like CD4+ and CD3+ cells, due to challenges in lysing red blood cells and stabilizing antibodies within microfluidic systems.
Innovation Solution
A microfluidic device with a capillary inlet containing a matrix that is partially dissolvable in the sample, comprising anti-CD4+ and anti-CD3+ antibodies labeled with fluorescent dyes, and a lyoprotectant, which allows for the lysing of red blood cells and stabilization of antibodies, enabling efficient detection of analytes by forming complexes with optical labels and differential pressure manipulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a matrix is used to stabilize antibodies and lyse red blood cells in the capillary inlet, then the detection reliability is improved, but the device complexity increases due to the need for partial dissolvability and lyoprotectant incorporation
Solution Approach 1:
The matrix is prepared in advance as a lyophilisate containing pre-formulated reagents for red blood cell lysis and antibody stabilization. This preliminary preparation allows the matrix to be stored in a stable dry state and only activated when needed, resolving the contradiction by enabling reliable detection functionality while maintaining device simplicity through pre-packaged solutions.
Solution Approach 2:
The matrix transitions from a dry, stable lyophilisate state to a dissolved, active state upon contact with the liquid sample. This parameter change (from solid to dissolved) enables the matrix to perform its detection functions while allowing for controlled activation, thereby improving reliability without permanently increasing device complexity.
2Ease of operation
If the matrix is made partially dissolvable in the sample, then the ease of operation is improved by enabling automatic activation, but the manufacturing precision requirements increase
Solution Approach 1:
The matrix is designed to automatically dissolve and activate upon contact with the liquid sample without requiring external intervention. The partial dissolvability enables the matrix to self-activate, improving ease of operation while the standardized lyophilisate formulation maintains manufacturing precision through controlled material composition.
Solution Approach 2:
The matrix employs a porous or particulate structure that facilitates controlled dissolution in the liquid sample. This structure allows the matrix to maintain structural integrity during manufacturing while enabling predictable dissolution behavior in use, thereby balancing ease of operation with manufacturing precision requirements.
3Productivity
If differential pressure manipulation is applied to move the liquid sample through the microfluidic channel, then the productivity is improved, but the device complexity increases due to the deformable wall mechanism
Solution Approach 1:
The microfluidic channel incorporates a deformable wall that can dynamically change its shape or position in response to pressure changes. This dynamic feature enables efficient liquid sample transport through differential pressure manipulation, improving productivity while the deformable wall design itself remains relatively simple, thus minimizing the increase in device complexity.
Solution Approach 2:
The device uses differential pressure (pneumatic/hydraulic principle) to drive the liquid sample through the microfluidic channel. This approach improves productivity by enabling controlled fluid transport without complex mechanical pumps, and the deformable wall serves as a simple pressure-responsive element rather than a complex mechanism.
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 device effectively detects analytes by forming complexes with optical labels and applying differential pressure, enhancing the analysis of bodily fluids and improving the detection of specific cells like CD4+ and CD3+ cells within the microfluidic system.
Implementation Method 1
a matrix covering at least a sub-section of the cross-sectional area of the capillary inlet and not filling the entire length of the capillary structure and allowing a flow through of liquid sample, wherein said matrix is at least partially dissolvable in the sample and is a lyophilisate comprising an anti-CD4+-antibody labelled with a first fluorescent dye and an anti-CD3+-antibody labelled with a second fluorescent dye
Implementation Method 2
an anti-CD4+-antibody labelled with a first fluorescent dye and an anti-CD3+-antibody labelled with a second fluorescent dye
Implementation Method 3
wherein the matrix comprises means for lysing red blood cells, and a lyoprotectant
Implementation Method 4
introducing at least a portion of the liquid sample into the microfluidic flow path of the device by reducing a pressure acting on a liquid sample-gas interface of the liquid sample, wherein the reducing a pressure is performed by compressing at least a portion of the microfluidic flow path to displace gas therefrom and subsequently decompressing the at least a portion of the microfluidic flow path
Implementation Method 5
a microfluidic channel including a capillary inlet
Data Source
Figure 1~2
Figure 3a
Figure 3b~3g
AI summary
A method for assaying a sample for each of multiple analytes is described. The method includes contacting an array of spaced-apart test zones with a liquid sample (e.g., whole blood). The test zones disposed within a channel of a microfluidic device. The channel is defined by at least one flexible wall and a second wall which may or may not be flexible. Each test zone comprising a probe compound specific for a respective target analyte. The microfluidic device is compressed to reduce the thickness of the channel, which is the distance between the inner surfaces of the walls within the channel. The presence of each analyte is determined by optically detecting an interaction at each of multiple test zones for which the distance between the inner surfaces at the corresponding location is reduced. The interaction at each test zone is indicative of the presence in the sample of a target analyte. Capillary structures of the devices or used in the methods may comprise a matrix and the devices may comprise control elements and methods for assaying of sample may use corresponding controlling activities.