Acoustic Ordering for Droplet Occupancy Control

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Solution Overview

Problem

Existing droplet loading processes are inefficient due to random Poisson statistics, leading to either empty droplets or droplets with multiple particles, which are undesirable scenarios.

Innovation Solution

The use of microfluidic devices equipped with a source of acoustic energy to propagate acoustic waves with nodes, allowing for the ordered placement of particles within droplets, thereby controlling the occupancy of droplets with particles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If particle concentration is reduced to prevent multiple particles per droplet, then droplet occupancy uniformity is improved, but the number of empty droplets increases

Engineering Contradiction:

Improvedroplet occupancy uniformityVSAvoideffective droplet yield

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The system performs preliminary sorting and ordering of particles in microfluidic channels before droplet formation. By pre-organizing particles into specific spatial patterns and using acoustic waves to position them at predetermined locations, the system ensures that each droplet receives the exact intended number of particles, eliminating both empty droplets and droplets with excessive particles without needing to reduce overall particle concentration

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system incorporates detection mechanisms that monitor particle presence and droplet formation in real-time. Based on this feedback, the system can adjust acoustic wave parameters, flow rates, and particle injection timing to compensate for variations and ensure consistent droplet occupancy, thereby maintaining high productivity while achieving uniform particle distribution

Inventive Principle:

Principle #23Feedback

2Manufacturing precision

If particle concentration is increased to ensure single particle per droplet, then droplet occupancy control is improved, but the number of droplets with multiple particles increases

Engineering Contradiction:

Improvedroplet occupancy controlVSAvoiddroplet particle composition consistency

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The system divides the particle suspension into separate microfluidic channels or zones where particles are individually tracked and positioned. By segmenting the particle delivery process and using acoustic waves to precisely control particle placement in each segment, the system maintains high particle concentration overall while ensuring controlled, consistent occupancy in each individual droplet

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system replaces conventional mechanical mixing and random diffusion methods with acoustic wave-based particle positioning. Acoustic waves provide precise, non-contact control over particle movement, enabling the system to maintain high particle concentrations while achieving uniform and consistent droplet occupancy through controlled acoustic field interactions

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Productivity

If acoustic energy is used to order particles, then droplet formation efficiency is improved, but device complexity increases

Engineering Contradiction:

Improvedroplet formation efficiencyVSAvoidacoustic ordering system complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The acoustic ordering system is integrated with the existing microfluidic droplet generation apparatus, allowing the same device to perform multiple functions: particle ordering via acoustic waves, droplet formation through microfluidic channels, and real-time monitoring. This multi-functionality reduces overall system complexity by consolidating components rather than requiring separate systems for each function

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system uses adjustable acoustic wave parameters (frequency, amplitude, duration) to optimize particle ordering for different droplet types and particle sizes. By changing these parameters rather than redesigning the physical structure, the system achieves high droplet formation efficiency while keeping the device complexity manageable through software/control-based optimization

Inventive Principle:

Principle #35Parameter changes

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 approach enables accurate and consistent placement of reagent materials within droplets, reducing stochastic processes and improving the efficiency of droplet formation by ensuring a specified number of particles per droplet.

Implementation Method 1

propagates an acoustic wave having one or more nodes in the first channel where the particles in the liquid in the first channel are ordered according to the one or more nodes

Methodology Applied

Scientific EffectAcoustic streaming: Acoustic Radiation Pressure

Data Source

PatentUS20250196143A1Devices and systems incorporating acoustic ordering and methods of use thereof

Publication Date: 2025.06.19 10X GENOMICS INC

AI summary

Devices, systems, and their methods of use, for generating droplets are provided. One or more geometric parameters of a microfluidic channel can be selected to generate droplets of a desired and predictable droplet size.