Vertical Microfluidic Chip for Optical Cell Analysis
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Solution Overview
Problem
Existing microfluidic chip designs for particle analysis and imaging suffer from particle settling due to gravity, leading to decreased image quality and inefficient particle sorting, especially when horizontal channels and zigzag configurations are used.
Innovation Solution
The microfluidic chip design addresses particle settling by injecting fluid vertically upwards from vials located below the chip, minimizing horizontal movement and using a short horizontal turn to negate settling effects, while also employing optical forces to suspend cells during analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If horizontal channels and zigzag configurations are used in microfluidic chip designs, then the chip structure is simplified and easier to manufacture, but particle settling due to gravity occurs leading to decreased image quality
Solution Approach 1:
The patent inverts the conventional horizontal microfluidic channel configuration by implementing a vertical channel architecture. The channel extends vertically from the bottom to the top of the chip substrate, with the analysis region positioned at the top surface. This inversion eliminates gravity-induced particle settling that plagues horizontal configurations, thereby maintaining manufacturing simplicity while dramatically improving image quality for particle and cell analysis.
Solution Approach 2:
The patent transitions from a two-dimensional horizontal channel layout to a three-dimensional vertical configuration. By utilizing the vertical dimension (Z-axis) of the chip substrate, the design creates a channel that rises from the bottom surface to the top surface, positioning the analysis region at the highest point. This dimensional change exploits gravity to keep particles suspended in the flow rather than settled, resolving the contradiction between structural simplicity and imaging quality.
2Ease of operation
If vials are located to the side and fluid is pumped horizontally into the channels, then the chip interface is conventional and easier to connect, but significant particle settling occurs due to gravity and dead volume
Solution Approach 1:
The patent inverts the conventional side-mounted vial configuration by positioning vials directly beneath the chip. The fluid delivery system routes fluid vertically upward from the bottom surface of the chip into the vertical channel, eliminating the horizontal pumping path. This inversion removes the dead volume accumulation zones and gravity-driven settling that occur in horizontal connections, thereby improving particle suspension stability while maintaining operational simplicity through direct vertical alignment.
Solution Approach 2:
The patent introduces a vertical fluid delivery intermediary system that connects sub-chip vials to the vertical channel inlet. This intermediary routing mechanism uses vertical tubing or capillaries to transport fluid upward from the vial location beneath the chip directly into the channel base, eliminating horizontal fluid paths and dead volume regions. This intermediary approach maintains ease of operation while ensuring continuous particle suspension through gravity-assisted vertical flow.
3Reliability
If a long horizontal input channel is used to connect vials to the chip, then the connection is stable, but the large diameter required creates low velocity areas that increase particle settling
Solution Approach 1:
The patent inverts the conventional long horizontal input channel by replacing it with a vertical channel configuration that extends from the chip bottom to top surface. This vertical orientation eliminates the large diameter requirements and low velocity zones inherent in horizontal connections, as the vertical flow path maintains higher velocities throughout. The connection stability is preserved through the vertical alignment of vials beneath the chip, while particle sorting efficiency is dramatically improved by eliminating settling-prone horizontal segments.
Solution Approach 2:
The patent extracts and eliminates the problematic horizontal input channel segment from the fluid path. By removing this settling-prone horizontal section entirely and replacing it with a direct vertical channel configuration, the design eliminates the large diameter requirements and low velocity areas that cause particle settling. This extraction improves particle sorting efficiency while connection stability is maintained through the vertical vial-to-channel alignment.
4Strength
If the analysis portion is located at the bottom of the chip, then chip material between microscope and sample is maximized providing structural support, but image clarity is reduced
Solution Approach 1:
The patent inverts the conventional bottom-surface analysis region configuration by positioning the analysis portion at the top surface of the chip. The vertical channel delivers fluid and particles to the top surface, where the analysis region is located with minimal overlying chip material. This inversion dramatically improves image clarity for microscopy and optical detection, while structural support is maintained through the inherent strength of the vertical channel architecture and substrate design.
Solution Approach 2:
The patent transitions the analysis region from a bottom-surface location to a top-surface location, utilizing the vertical dimension of the chip substrate. By positioning the analysis region at the top surface where the vertical channel terminates, the design minimizes the thickness of chip material between the sample and the microscope objective. This dimensional repositioning enhances optical access and image clarity while structural integrity is preserved through the vertical channel reinforcement.
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 design enhances image clarity by reducing the distance between the microscope and the sample, improves particle suspension and sorting efficiency, and allows for label-free detection of cellular changes, making it suitable for cell therapy applications.
Implementation Method 1
The laser also suspends cells in this channel during analysis which prevents them from settling
Implementation Method 2
injection occurs in an upwards vertical direction, and fluid vials are located below the chip in order to minimize particle settling before and at the analysis portion of the chip's channels
Data Source
AI summary
Provided are methods and devices for assessing biological particles for use in cell immunotherapy. By utilizing a microfluidic chip device together with optical force measurement and cell imaging, the methods enable comprehensive assessment and characterization of biological particles with regard to morphology, motility, binding affinities, and susceptibility to external forces, including but not limited to, chemical, biochemical, biological, physical and temperature influences. The methods enable the selection and production of biological particles, such as engineered T-cells, for use in immunotherapy and biomanufacturing.