Acoustic Nano-Suspension Process Eliminates Metal Shedding
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Solution Overview
Problem
High-shear milling processes for preparing nano-suspensions face challenges such as metal particle shedding, drug degradation, limited drug loading, and difficulties in scaling up, which hinder the commercial production of nano-suspensions for pharmaceutical applications.
Innovation Solution
The process involves applying acoustic energy with frequencies between 10 hertz to 1000 hertz to an admixture of active pharmaceutical compounds, an aqueous dispersion medium, and milling media, creating a standing wave that provides linear acceleration of 10 G's to 100 G's to form nano-suspensions with particle sizes less than 1 micron, allowing for higher drug loading and reduced degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-shear milling is used to prepare nano-suspensions, then particle size reduction is achieved, but metal particle shedding and drug degradation occur
Solution Approach 1:
The patent replaces the mechanical high-shear milling system with an acoustic field-based system. Acoustic waves are used to generate cavitation and micro-jetting effects in the liquid medium, which mechanically break down particles without requiring direct mechanical contact between high-shear elements and the drug substance, thereby eliminating metal particle shedding while maintaining particle size reduction capability.
Solution Approach 2:
The patent employs acoustic vibration at specific frequencies (typically ultrasonic frequencies) to create oscillating pressure waves in the liquid medium. These vibrations generate cavitation bubbles that collapse and produce localized high-shear forces, enabling particle size reduction through a different mechanical mechanism that avoids direct contact between milling media and drug substance.
2Manufacturing precision
If high-shear milling is used to prepare nano-suspensions, then particle size reduction is achieved, but drug degradation occurs
Solution Approach 1:
The patent substitutes direct mechanical shear forces with acoustic field-induced cavitation and micro-jetting. This indirect mechanical action reduces the risk of drug degradation by avoiding prolonged exposure to high-shear forces and metal particle contact, while still achieving the required particle size reduction through the energy released during cavitation bubble collapse.
3Productivity
If high-shear milling equipment is used, then nano-suspension preparation is possible, but scaling up is difficult
Solution Approach 1:
The patent replaces complex mechanical high-shear milling equipment with acoustic field generation systems. Acoustic waves can be easily scaled in power and volume without requiring proportional increases in mechanical complexity, as the acoustic energy can be distributed uniformly throughout the liquid medium. This enables straightforward scaling from laboratory to industrial production while maintaining consistent particle size reduction and avoiding metal particle shedding.
4Productivity
If high-shear mixing chamber is used, then nano-suspension can be prepared, but aseptic manufacturing is compromised
Solution Approach 1:
The patent replaces the high-shear mixing chamber with an acoustic field-based preparation system that can be configured for aseptic manufacturing. The acoustic waves can be generated outside the sterile containment, and the cavitation effects occur within the liquid medium without requiring direct mechanical contact that would compromise sterile barriers. This enables nano-suspension preparation under aseptic conditions, eliminating the risk of contamination from mechanical components.
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
This method results in nano-suspensions with higher active pharmaceutical compound loadings, reduced agglomeration, and lower degradation products, facilitating more efficient and stable production, including scalability from bench-scale to commercial production while maintaining aseptic conditions.
Implementation Method 1
applying acoustic energy having a frequency of from about 10 hertz to 1000 hertz to said admixture, wherein preferably the acoustic energy is a standing wave supplying a linear acceleration of from about 10 G's to about 100 G's
Implementation Method 2
applying acoustic energy having a frequency of from about 10 hertz to 1000 hertz to said admixture, wherein preferably the acoustic energy is a standing wave supplying a linear acceleration of from about 10 G's to about 100 G's
Data Source
AI summary
Described herein is a process for preparing nano-suspensions, wherein the process comprises: providing an admixture of at least one active pharmaceutical compound, an aqueous dispersion medium, and milling media and applying thereto acoustic energy having a frequency of from about 10 hertz to 1000 hertz and which supplies a linear acceleration of from about 10 G's to about 100 G's (where “G” is the force of gravity) for a period sufficient to supply a nano-suspension having a D50 of less than about 1 micron, preferably less than about 500 nm. Described also are nano-suspensions having novel properties prepared via the inventive process.