Multiphoton Flow Cytometer for Intact Multicellular Aggregates
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Solution Overview
Problem
Conventional flow cytometry systems are not well-suited for analyzing multicellular aggregates due to shear forces that disrupt these structures and lack the ability to effectively assess three-dimensional cellular structures, making it difficult to determine viability and functional competence of cultured cells for regenerative medicine applications.
Innovation Solution
A flow cytometry system with a specially designed fluid handling system that reduces shear forces, combined with multiphoton laser scanning microscopy for non-destructive interior fluorescence measurements, allowing for real-time characterization and sorting of multicellular aggregates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If conventional flow cytometry is used to analyze multicellular aggregates, then automated monitoring capability is achieved, but shear forces disrupt the intercellular connections of the aggregates
Solution Approach 1:
The patent changes the flow rate parameter from conventional high-speed flow to low flow rates (0.1-1 mL/min), which reduces shear forces below the threshold that would disrupt intercellular connections. This parameter modification allows automated monitoring to proceed without damaging the multicellular aggregates.
Solution Approach 2:
The patent employs a specialized hydraulic system with controlled fluid dynamics, using a flow cell design that minimizes turbulent flow and shear stress. The system uses precisely controlled liquid flow to transport aggregates through the imaging chamber without subjecting them to disruptive mechanical forces.
2Extent of automation
If conventional flow cytometry monitoring systems are used, then automated cell analysis is achieved, but the systems are not well adapted for analysis of three-dimensional cellular structures
Solution Approach 1:
The patent transitions from conventional two-dimensional flow cytometry detection to three-dimensional multiphoton laser scanning microscopy. This enables optical sectioning and visualization of interior cells within the aggregate at different depths, providing true 3D structural analysis capability while maintaining automated operation.
Solution Approach 2:
The patent replaces conventional single-photon fluorescence detection with multiphoton laser scanning microscopy. This substitution enables deeper penetration into the aggregate and provides optical sectioning capability, allowing automated analysis of three-dimensional cellular structures without physical disruption.
3Measurement precision
If low flow rates are used to stabilize cells for multiphoton laser scanning microscopy, then interior structure analysis is enabled, but processing speed is reduced
Solution Approach 1:
The patent implements a dynamic system that adjusts flow conditions to match the specific requirements of each aggregate size and type. The system can modulate flow rates in real-time, optimizing both stabilization for imaging and throughput by processing different aggregate types at appropriately adjusted speeds.
Solution Approach 2:
The patent maintains continuous automated operation by implementing rapid image acquisition and processing protocols. The multiphoton laser scanning microscope is configured to capture necessary data efficiently, and the system continuously processes aggregates through the flow cell without interruption, maximizing throughput within the constraints of low-flow stabilization requirements.
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 the rapid characterization of interior cells within multicellular aggregates without damaging inter-cell connections, providing sophisticated analysis metrics and enabling automated sorting while maintaining the integrity of the aggregates.
Implementation Method 1
A multiphoton laser scanning microscope is positioned to illuminate multicellular aggregates within the liquid flow and to record fluorescence of multiple cells of the multicellular aggregates
Implementation Method 2
The channel and volume flow are designed to provide a hydrodynamic focusing of multicellular aggregates within the liquid without disruption of intercellular connections
Data Source
AI summary
A flow cytometry system suitable for characterizing multicellular aggregates during culture and before implantation combines a low shear flow channel with a multiphoton laser scanning microscope, the latter permitting the characterization of interior and exterior cells in optical isolation from other cells for a representative sampling of fluorescent activity. Imaging capabilities permit sophisticated statistical measurements reflecting individual cell characteristics.