Two-Dimensional Flow Channel Baffles for Lipid Nanoparticle Size Control
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Solution Overview
Problem
Conventional methods for preparing lipid nanoparticles struggle to achieve precise control over particle diameter, particularly in the range of 10 nm to 100 nm, which is critical for effective drug delivery systems.
Innovation Solution
A flow channel structure with a two-dimensional design, featuring baffles of fixed width alternately disposed from both side surfaces, is used to precisely form nano-sized lipid particles or micelles. This structure relies on molecular diffusion for mixing and dilution, allowing for adjustable dilution rates by varying the width, length, and arrangement of the baffles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods such as extrusion or ultrasonic treatment are used to prepare lipid nanoparticles, then the preparation process is simple, but it is difficult to precisely control particle diameter within the range of 10 nm to 100 nm
Solution Approach 1:
The flow channel is segmented into multiple sections with progressively narrower widths, creating a series of dilution zones. This segmentation allows stepwise control of the lipid solution dilution process, enabling precise particle diameter control within 10-100 nm range while maintaining a relatively simple continuous flow structure
Solution Approach 2:
The invention transitions from conventional one-dimensional mixing approaches to a two-dimensional flow channel design where the channel width varies along the flow direction. This dimensional change creates multiple dilution zones that enable precise control over particle formation and size without requiring complex three-dimensional mixing structures
2Manufacturing precision
If microdevices with three-dimensional mixer structure are used to prepare lipid nanoparticles, then particle diameter can be precisely controlled, but the microdevices are difficult to fabricate and process
Solution Approach 1:
The invention extracts the essential mixing function from complex three-dimensional mixer structures and implements it through a simplified two-dimensional flow channel with varying width. This extraction maintains particle diameter control capability while eliminating the fabrication difficulties associated with three-dimensional mixing structures
Solution Approach 2:
The invention replaces mechanical three-dimensional mixing structures with a flow-based dilution system where the channel geometry itself controls the mixing and dilution process. This substitution eliminates the need for complex mechanical mixer components, making the device much easier to fabricate while maintaining precise particle size control
3Adaptability or versatility
If microdevices with three-dimensional mixer structure are used, then lipid nanoparticles can be prepared, but the range of particle diameter is narrow
Solution Approach 1:
The flow channel width is designed to dynamically vary along the flow direction, creating multiple dilution zones with different dilution ratios. This dynamic geometry allows the system to produce lipid nanoparticles across a wide particle diameter range (10-100 nm) by adjusting flow rates, while the underlying structure remains a simple two-dimensional channel without complex moving parts
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 proposed flow channel structure enables the precise formation of lipid particles or micelles with a high degree of particle diameter controllability, achieving sizes within the 10 nm to 100 nm range with minimal variation, thus enhancing their utility as carriers in drug delivery systems.
Implementation Method 1
Mixing and dilution with this two-dimensional microchannel are dependent on molecular diffusion
Data Source
AI summary
Provided are: a flow channel structure with which lipid particles or micelles, which are useful as nano-sized carriers, for example, in drug delivery systems, are produced with good control of particle size; and a method for forming lipid particles or micelles using the same. Said flow channel structure has a two-dimensional structure such as one in which multiple structural elements (baffles) of a specified width are alternately disposed from the two side faces in a micro-sized flow channel through which feedstock solutions are flowed.