Microfluidic Cell Lysis Device With Pneumatic Bead Agitation
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Solution Overview
Problem
There is a need for an efficient cell lysis method compatible with microfluidic devices, as existing methods like bead beating are not effectively adapted for such devices.
Innovation Solution
A method involving a microfluidic device with a first chamber containing beads, where a liquid volume fraction of 0.6 or less is maintained, and agitation is used to lyse cells or viruses, utilizing a flexible membrane and pneumatic or ultrasonic agitation to induce bead collisions for cell disruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If bead beating is performed with traditional table top equipment, then cell lysis can be achieved, but the method is not compatible with microfluidic devices
Solution Approach 1:
The device is divided into multiple chambers including a first chamber for bead beating, a second chamber for pneumatic actuation, and a third chamber for collection. This segmentation allows the complex bead beating process to be adapted for microfluidic integration by separating functions into discrete, manageable chambers that can be fabricated using standard microfluidic techniques.
Solution Approach 2:
A flexible membrane is introduced as an intermediary element between the pneumatic chamber and the bead beating chamber. The membrane transmits mechanical force from pneumatic pressure to the beads and sample, enabling cell lysis without requiring direct mechanical contact or complex moving parts within the microfluidic device.
2Quantity of substance
If liquid volume is reduced for microfluidic operation, then reagent consumption is minimized, but cell lysis efficiency may be compromised
Solution Approach 1:
The patent optimizes the liquid volume fraction parameter to a specific range (0.4-0.6) to achieve effective cell lysis in microfluidic conditions. By controlling this parameter, the system maintains high lysis efficiency with minimal liquid volume, resolving the contradiction between reduced reagent consumption and maintained productivity.
Solution Approach 2:
The device creates localized high-shear regions within the first chamber where beads collide with cells during agitation. This local concentration of mechanical energy ensures effective lysis occurs in a small volume, allowing microfluidic operation with minimal liquid while maintaining high cell disruption efficiency.
3Productivity
If vigorous agitation is applied for effective bead beating, then cell disruption is enhanced, but device complexity increases
Solution Approach 1:
The complex mechanical agitation system is replaced with a pneumatic actuation system. By applying pneumatic pressure to the second chamber, the flexible membrane transmits force to induce bead movement and collision in the first chamber, achieving vigorous agitation without complex mechanical moving parts.
Solution Approach 2:
Pneumatic pressure is used to drive the cell lysis process. The third chamber receives pneumatic input that translates to membrane deformation and subsequent bead agitation in the first chamber, providing an simple yet effective means to achieve vigorous mixing and cell disruption in a microfluidic context.
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 method achieves high cell lysis efficiency with minimal liquid volume, allowing for efficient extraction of nucleic acids without the need for additional purification steps, as demonstrated by the comparison with enzymatic and benchtop vortexing methods.
Implementation Method 1
a flexible membrane sealably disposed between the first and second chambers
Implementation Method 2
agitation is used to lyse cells or viruses
Implementation Method 3
pneumatic or ultrasonic agitation to induce bead collisions for cell disruption
Implementation Method 4
ultrasonic agitation to induce bead collisions
Implementation Method 5
a diameter of the beads is larger than a diameter of the net and the outlet
Data Source
AI summary
A method of lysing at least one of a cell and a virus, the method including: contacting a sample, which includes at least one of a cell and a virus, with a plurality of beads which are disposed in a first chamber to obtain a combination of the sample and the beads; and agitating the combination of the sample and the beads to lyse the at least one of the cell and the virus, wherein in the first chamber a liquid volume fraction is 0.6 or less, and wherein the liquid volume fraction is a value obtained by dividing a liquid volume of the first chamber by a pure void volume equivalent to a sum of the liquid volume of the first chamber and a void volume of the first chamber.