Motor-Driven Open Flow for Mesoscale Cell Sorting Accuracy

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Solution Overview

Problem

Existing technologies struggle to automate the manipulation and sorting of mesoscale bioparticles (100 μm to 1 mm) due to their size, which is too small for milli-liquid handling and too large for microfluidic systems, leading to loss or clogging, and require high-content screening methods like image-based analysis.

Innovation Solution

A device using arrays of computer-controlled stepper micromotors to drive open flow in unconfined conditions, mimicking channel flow without confinement, enabling modular and programmable mesoscale flow control with linear closed-loop control and image-based sorting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If robotic liquid handling technologies are used for manipulation, then milli-scale particles can be handled, but mesoscale bioparticles are lost in marginal pipetting errors

Engineering Contradiction:

Improverobotic liquid handling capabilityVSAvoidpositioning accuracy for mesoscale particles

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent replaces robotic liquid handling mechanical systems with a magnetic field-based manipulation system. Magnetic fields provide contactless, precise control of mesoscale particles without the mechanical errors inherent in pipetting and robotic manipulation, resolving the contradiction between ease of operation and measurement precision.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces magnetic fields as an intermediary between the control system and mesoscale particles. This intermediary enables precise positioning and manipulation of particles in the mesoscale range (100 μm to 1 mm) without direct mechanical contact, avoiding the loss and positioning errors associated with robotic liquid handling.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If microfluidic technologies are used for manipulation, then microscale particles can be handled, but mesoscale bioparticles may clog microfluidic channel flows

Engineering Contradiction:

Improvemicrofluidic flow control capabilityVSAvoidcompatibility with mesoscale particle sizes

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The patent substitutes microfluidic channel-based mechanical flow control with magnetic field-driven particle manipulation. This eliminates the physical constraints of microfluidic channels that cause clogging with mesoscale particles, while maintaining precise flow control capabilities through magnetic actuation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent transitions from two-dimensional microfluidic channel confinement to three-dimensional magnetic field manipulation in open space. This dimensional change allows mesoscale particles to be manipulated without the geometric constraints and clogging issues inherent in microfluidic channels.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Measurement precision

If image-based analysis is implemented for high-content screening, then complex structures can be analyzed, but system complexity increases

Engineering Contradiction:

Improveanalysis accuracy for complex structuresVSAvoidsystem integration complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent merges magnetic manipulation and image-based analysis into a unified platform. The magnetic manipulation system positions particles for optimal imaging, while the analysis software integrates with the manipulation control, creating a coordinated system that achieves high-content screening without proportionally increasing overall system complexity.

Inventive Principle:

Principle #5Merging (Combining)

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 precise and automated manipulation and sorting of mesoscale bioparticles with real-time feedback, bypassing the need for microfabrication and external pumps, and achieving high accuracy in sorting and analysis.

Implementation Method 1

uses rotating shafts in a Stokes flow regime to robotically manipulate biological objects

Methodology Applied

Scientific EffectStokes flow:

Data Source

PatentUS20260022327A1Device and method for automatic cellular sorting and analysis via robotic motor-driven flow

Publication Date: 2026.01.22 RGT UNIV OF CALIFORNIA

AI summary

Automating operations and handling of mesoscale biological objects that range in size from ˜100 μm to ˜1 mm can accelerate the advancement of disease modeling and drug discovery based on organoids and cell-carrier systems. The device leverages flow driven by rotating shafts in a Stokes flow regime to develop a gentle robotic manipulation system for objects based on controllable arrays of micro-motors. The underlying motor-flow mechanics was investigated that enable linear flow control from one pair of motors to an ensemble of reconfigurable motors. This robotic motor-flow driving system can operate in standard cell culture containers (e.g., Petri dish) to perform precise and real-time control of mesoscale cellular constructs in diverse biocompatible carrier fluids such as cell media. Using optional image-based feedback, a fully automated bioparticle sorting system may be created based on the device.