Laser Drilled Microfluidic Orifices for Disposable Flow Cells
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Solution Overview
Problem
Conventional microfluidic flow-through elements, such as nozzle tips, face challenges in precise manufacturing due to the hardness of materials like jewels and ceramics, leading to difficulties in achieving predictable and reproducible results, and the need for specialized assembly techniques, which are costly and labor-intensive. Additionally, existing methods for creating orifice regions in microfluidic channels are limited by material constraints and require multiple components, resulting in potential leakages and non-ideal fluid conditions.
Innovation Solution
A process involving the use of electromagnetic radiation, specifically laser drilling, to form orifices in microfluidic flow-through elements, allowing for precise alignment and creation of orifice regions with defined geometries, enabling the production of low-cost, disposable, and sterilizable microfluidic elements with improved manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional materials like jewels or ceramics are used to create orifice regions, then the orifices are durable and resistant to wear, but the manufacturing process becomes difficult, laborious, and expensive due to material hardness
Solution Approach 1:
The patent replaces mechanical drilling or cutting methods with laser-based electromagnetic radiation to create orifices. The laser ablates the material to form precise orifice geometries without mechanical contact, eliminating the difficulties associated with machining hard materials like jewels and ceramics while maintaining their durability
Solution Approach 2:
The patent changes the physical state and properties of materials by using laser energy to melt, vaporize, or ablate material. By controlling laser parameters (power, pulse duration, focal point), precise orifice geometries are created in various materials including polymers, glass, and ceramics, resolving the contradiction between material hardness and manufacturability
2Adaptability or versatility
If multiple laminated layers are stacked to form microfluidic channels, then the structure is modular and adaptable, but the fluid flow path geometries are limited to square or rectangular orifices
Solution Approach 1:
The patent uses laser drilling to create orifices with arbitrary geometries (circular, elliptical, irregular shapes) that cannot be achieved with conventional laminated layer stacking. The laser can precisely control the orifice shape and size independent of the layer structure, enabling complex flow path geometries while maintaining modular device construction
Solution Approach 2:
The patent transitions from two-dimensional laminated layer stacking to three-dimensional laser drilling through the layers. The laser can drill at angles, create intersecting channels, and form complex 3D geometries that go beyond the limitations of planar lamination, enabling sophisticated fluid flow paths
3Manufacturing precision
If ceramic molding with fine pins is used to create orifices, then precise orifice geometries can be achieved, but the molding pins are prone to damage, wear, and misalignment
Solution Approach 1:
The patent replaces mechanical molding pins with a laser beam to create orifices. The laser beam has no physical contact with the workpiece, eliminating wear, damage, and misalignment issues associated with fine molding pins. The laser can be precisely positioned and focused to achieve the same or better geometric precision without the reliability problems of mechanical systems
Solution Approach 2:
The patent uses laser scanning to replicate precise orifice geometries by following digital design data. The laser beam can be programmed to trace any desired orifice shape with high accuracy, replacing the need for physical master molds or precision-machined pins that are susceptible to degradation
4Ease of manufacture
If conventional manufacturing methods are used, then orifices can be created in traditional materials, but the production cost is high and assembly requires special techniques
Solution Approach 1:
The patent combines orifice creation with the base substrate manufacturing process by using laser drilling on the finished or near-finished substrate. This eliminates separate assembly steps for installing orifice components, reduces the number of parts, and simplifies manufacturing while maintaining the ability to create precise orifices in various materials
Solution Approach 2:
The patent enables cost-effective manufacturing of disposable microfluidic devices by using laser drilling on inexpensive polymer substrates. The laser process is well-suited for high-volume production of single-use devices, eliminating the need for expensive reusable components and complex assembly techniques
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 method enables the production of microfluidic flow-through elements with precise orifice geometries, ensuring consistent and reproducible fluid flow, reducing manufacturing costs, and allowing for the creation of disposable components suitable for high-throughput applications in flow cytometry and other microfluidic systems.
Implementation Method 1
directing a beam from the laser in a flow-path direction. The process may further include impinging the beam from the laser onto the end wall of the base substrate to thereby form an orifice region through the end wall of the base substrate with the beam from the laser
Data Source
AI summary
Microfluidic flow-through elements and methods for forming and using the same, particularly, low cost, easily sterilized, disposable microfluidic flow-through elements may include an orifice region suitable, for example, for fluid jet formation (such as in a droplet sorter or flow cell) or sample injection or hydrodynamic focusing (such as in a non-droplet flow cytometer). Laser drilling, for example laser ablation, may be used to form an orifice region extending through an orifice wall section of a base substrate. The base substrate may be unitarily-formed by injection molding a polymeric material. The orifice region may be advantageously configured to form a predetermined geometry by controlling the characteristics of the ablating beam.