Electromechanical Gel Microfluidic Pump for Polymer Substrates
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Solution Overview
Problem
Existing microfluidic pump technologies face challenges in efficiently controlling small volumes of fluids and are difficult to manufacture, especially when integrated on polymer-based substrates for biomechanical assays.
Innovation Solution
A microfluidic pump apparatus utilizing an electromechanical gel within a microfluidic channel, controlled by electrodes to deform and create cavities or restrictions, enabling fluid pumping through sequential voltage applications, with optional controlling circuitry and a higher viscosity film for enhanced functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional microfluidic pump technologies are used, then fluid control capability is achieved, but manufacturing complexity and cost increase due to requirement of micro-electromechanical systems
Solution Approach 1:
The patent replaces complex micro-electromechanical systems with a simplified electromechanical gel-based actuation mechanism. The gel responds to electrical signals by changing its mechanical properties, eliminating the need for traditional MEMS components while achieving the same fluid pumping function. This substitution dramatically reduces manufacturing complexity and enables production on standard polymer substrates.
Solution Approach 2:
The invention utilizes changes in the electromechanical gel's physical parameters (viscosity, elasticity) in response to applied electrical fields. By controlling the electrical parameters applied to the gel, the system achieves precise fluid control without mechanical moving parts. The gel transitions between different states (rigid/soft) based on electrical input, enabling pump operation through parameter modulation rather than mechanical actuation.
2Ease of manufacture
If electromechanical gel is used for fluid control, then manufacturing on polymer substrates is enabled, but precision of small volume fluid handling may be compromised
Solution Approach 1:
The microfluidic channel is divided into multiple segments, each containing an electromechanical gel actuator. By segmenting the channel and using multiple independently controllable gel regions, the system achieves precise control over small fluid volumes. Each segment can be actuated separately, enabling accurate metering and handling of microliter quantities through coordinated activation of individual segments.
Solution Approach 2:
The electromechanical gel acts as an intermediary between the electrical control signals and the fluid. This intermediate layer translates electrical inputs into mechanical deformations that precisely control fluid movement. The gel's unique properties allow it to transmit control signals accurately while maintaining compatibility with polymer substrate manufacturing processes, bridging the gap between electrical control and precise fluid handling.
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 control of fluid flow, facilitating the handling of small volumes, such as μL quantities, and simplifies manufacturing by eliminating the need for micro-electromechanical systems, making the apparatus more cost-effective and suitable for biochemical assays.
Implementation Method 1
the at least one pair of electrodes are configured to control the electric field across the microfluidic channel to cause the electromechanical gel to deform in response to a voltage applied to the electrodes
Data Source
AI summary
An apparatus and method, the apparatus comprising: a microfluidic channel (3); an electromechanical gel (5) provided within the microfluidic channel (3); at least one pair of electrodes (7) wherein the at least one pair of electrodes (7) are configured to control the electric field across the microfluidic channel (3) to cause the electromechanical gel (5) to deform in response to a voltage applied to the electrodes (7) such that the deformation enables fluid to be pumped through the microfluidic channel (3).