Laser-Driven Photoacoustic Microfluid Pump for Contactless Fluid Control
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Solution Overview
Problem
Current micropumps face challenges in efficiently transforming light energy into mechanical energy for medical applications, particularly in achieving directional fluidic jets and vortex generation in microfluidic systems without moving parts or electrical contacts.
Innovation Solution
The use of laser-driven photoacoustic microfluid pumps (LDMPs) with photoacoustic materials and fiber optic elements to generate directional ultrasound waves and fluidic jets, allowing for the movement of cylinders and creation of vortices within microfluidic chips, utilizing laser beams to thermally expand and contract photoacoustic layers and implanted metals for fluid manipulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If traditional micropumps are used to transform light energy into mechanical energy, then some mechanical action is achieved, but the transformation efficiency is low and moving parts are required
Solution Approach 1:
The patent replaces traditional mechanical pump components with laser-driven photoacoustic microfluid pumps that use light energy to generate acoustic waves for fluid manipulation. The fiber optic element with photoacoustic material converts laser energy directly into acoustic streaming without mechanical moving parts, achieving contactless fluid control.
Solution Approach 2:
The patent introduces photoacoustic material as an intermediary that converts light energy into acoustic energy. The fiber optic element delivers laser energy to the photoacoustic material, which then generates acoustic waves to drive fluid flow, serving as an energy conversion mediator between optical and mechanical domains.
2Ease of operation
If laser-driven photoacoustic microfluid pumps are used to generate directional fluidic jets, then precise fluid manipulation is achieved, but the device structure becomes more complex
Solution Approach 1:
The patent applies photoacoustic material specifically at the tip of the fiber optic element where fluid manipulation is needed, rather than throughout the entire device. This localized application of functional material achieves precise directional fluid jets while minimizing overall device complexity and material usage.
Solution Approach 2:
The fiber optic element serves multiple functions: it delivers laser energy to the photoacoustic material, acts as a waveguide for acoustic waves, and provides structural support for the microfluidic system. This multi-functionality reduces the need for separate components, simplifying the overall device structure despite the advanced functionality.
3Productivity
If traditional fluid mixing methods are used in microfluidic systems, then mixing is achieved, but cell damage and thrombosis may occur
Solution Approach 1:
The patent replaces mechanical mixing methods that cause shear stress and cell damage with laser-driven acoustic streaming for gentle fluid manipulation. The acoustic waves induce fluid flow and mixing through pressure variations rather than mechanical agitation, preserving cell integrity while achieving effective mixing.
Solution Approach 2:
The photoacoustic microfluid pumps generate fluid flow and mixing through the inherent acoustic streaming effect produced by laser illumination of the photoacoustic material. The system uses the energy from the laser itself to create the fluid motion needed for mixing, eliminating the need for separate mechanical pumps or mixers that could harm cells.
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 efficient, non-contact fluid manipulation and mixing in microfluidic systems, reducing cell damage and thrombosis, with the ability to deliver drugs precisely and enhance microfluidic mixing, suitable for medical applications such as drug delivery and microfluidic surgery.
Implementation Method 1
The layer of photoacoustic material may be configured to generate a directional ultrasound wave in response to a laser beam impinging on the layer
Implementation Method 2
thermally expanding and contracting a photoacoustic layer implanted on an end portion of the cylinder in response to the laser beam striking the photoacoustic layer
Implementation Method 3
The first LDMP is configured to generate a directional fluidic jet from the fluid, and to push the cylinder in a first direction
Data Source
AI summary
An apparatus for controlling a cylinder by a microfluidic stream includes a microtube, a first laser-driven photoacoustic microfluid pump (LDMP), and a fiber optic element. The microtube includes a fluid and a cylinder. The fiber optic element includes a first end and a second end. The first end is disposed on the first LDMP and the second end is disposed in a first end portion of the microtube. The first LDMP is configured to generate a directional fluidic jet from the fluid and to push the cylinder in a direction away from the second end of the fiber optic element.