Double-Helix Microfluidic Artificial Muscle for Smooth High-Force Actuation

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Solution Overview

Problem

Existing actuation systems for robotic applications, such as exoskeletons and prosthetics, face challenges with electromagnetic motors that require significant power and generate excess heat, while pneumatics struggle with jerky motion when scaled down, necessitating a more efficient and reliable actuation method for artificial muscles.

Innovation Solution

A double-helix weave architecture for microcapacitor arrays in artificial muscles, featuring independent microfluidic channels entwined in a double helix and maintained at opposite electrical polarity, with a scalable wiring scheme that ensures mechanical strength, efficient fluidic filling, and balanced electrical connectivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If electromagnetic motors are used for actuation, then precision and convenience of power supply are improved, but power consumption increases and heat generation occurs

Engineering Contradiction:

Improveactuation precisionVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent replaces electromagnetic motors with a microfluidic-based artificial muscle system that uses fluid pressure to drive actuation. The double-helix weave architecture with microcapacitor arrays uses electrostatic actuation rather than electromagnetic motors, eliminating the need for strong permanent magnets or solenoids while reducing power consumption and heat generation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention employs microfluidic channels to deliver pressurized fluid to the microcapacitor arrays, enabling actuation through hydraulic pressure. The double-helix weave structure allows fluid to be distributed efficiently through entwined channels, converting fluid pressure into mechanical motion without requiring electromagnetic components.

Inventive Principle:

Principle #29Pneumatics and hydraulics

2Volume of moving object

If pneumatic systems are scaled down for compact systems, then space is reduced, but force output decreases and motion becomes jerky

Engineering Contradiction:

Improvesystem sizeVSAvoidforce output

Core Design Contradiction:

Volume of moving objectVSForce

Solution Approach 1:

The patent divides the pneumatic system into numerous micro-scale segments - specifically, arrays of microcapacitors with individual microfluidic channels. This segmentation allows the system to maintain compact size while distributing force across many small actuators, preventing jerky motion through parallel operation of multiple micro-actuators.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention transitions from traditional 2D pneumatic actuation to a 3D double-helix weave architecture. The entwined microfluidic channels and microcapacitor arrays create a three-dimensional structure that packs actuators more efficiently in space, maintaining high force density while reducing overall system volume.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Ease of manufacture

If microcapacitor arrays are wired traditionally, then electrical connectivity is achieved, but mechanical strength and fluidic filling efficiency are compromised

Engineering Contradiction:

Improvewiring simplicityVSAvoidmechanical strength

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The patent merges the electrical wiring function with the mechanical structure by integrating microfluidic channels directly into the double-helix weave architecture. The same entwined structure that provides mechanical strength also serves as the fluidic pathway, eliminating separate wiring channels and simplifying manufacturing while maintaining structural integrity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The double-helix weave structure serves multiple functions simultaneously: it provides mechanical strength through its entwined architecture, enables efficient fluidic filling through its interconnected channels, and establishes electrical connectivity through the microcapacitor arrays. This multi-functional design eliminates the need for separate dedicated wiring structures.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

The solution provides a scalable and efficient actuation system that achieves high force density and smooth motion, overcoming mechanical, fluidic, and electrical challenges, making it suitable for a wide range of applications including exoskeletal locomotion and biomimetic robots.

Implementation Method 1

arrays of microcapacitor stacks defined microfluidically and connected in parallel can produce a longitudinal contractive force density that scales as the square of applied voltage

Methodology Applied

Scientific EffectElectrostatic actuation: Electrostatics

Data Source

PatentUS12472080B2Scalable microfluidic double-helix weave architecture for 3D-printable biomimetic artificial muscles

Publication Date: 2025.11.18 THE GOVERNMENT OF THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY DEPARTMENT OF HEALTH & HUMAN SERVICES

AI summary

A double-helix weave architecture for an artificial muscle is described. The artificial muscle includes a number of microfluidic channels that are arranged into artificial muscles fibers, where each artificial muscle fiber includes two independent mutually-unconnected microfluidic channels that are entwined in a double helix weave and maintained at opposite electrical polarity.