Continuous Microbubble Production via Ultrasonic Flow Chamber
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Solution Overview
Problem
Current methods for producing gas-filled microbubbles are inadequate for large-scale applications, as they require low volume batch production and are not suitable for generating sufficient quantities needed for medical and industrial uses, where stability and controlled release of gas are critical.
Innovation Solution
A microbubble generation system utilizing a sonicator and flow chamber to produce and size-sort gas-filled microbubbles, with a controller to maintain the interface between the lipid solution and gas, allowing for continuous or batch-wise production of stable microbubbles with greater than 50% volume gas and sizes below 10 μm, which can retain their gas payload for extended periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If low volume batch production techniques are used, then imaging applications can be achieved with sufficient microbubbles, but large-scale medical and industrial applications cannot be met due to inadequate quantities
Solution Approach 1:
The production process is divided into two distinct modes: batch production mode for imaging applications and continuous production mode for large-scale applications. The system can switch between these modes by adjusting operational parameters, enabling flexible production volumes to meet different application requirements.
Solution Approach 2:
The system employs dynamic control of production parameters including flow rates, sonication power, and gas flow to transition between batch and continuous production modes. This dynamic adjustment allows the system to optimize microbubble production quantity for both small-scale imaging and large-scale medical/industrial applications.
2Quantity of substance
If microbubbles are produced with high gas concentration, then gas delivery capability is improved, but microbubble stability deteriorates causing rapid gas loss
Solution Approach 1:
The system optimizes multiple parameters simultaneously including lipid concentration (5-20%), sonication power (20-100 W), sonication frequency (20-100 kHz), and gas flow rate (1-100 mL/min) to achieve the optimal balance between gas concentration and stability. These parameter changes enable production of microbubbles with 50-90% gas volume while maintaining stability for extended periods.
Solution Approach 2:
The system incorporates feedback control through monitoring microbubble characteristics during production and adjusting operational parameters accordingly. This includes monitoring bubble size distribution, gas concentration, and stability metrics to optimize the balance between high gas payload and prolonged stability.
3Length of moving object
If microbubble size is reduced to below 10 μm for medical applications, then safety and distribution are improved, but production complexity increases
Solution Approach 1:
The system uses periodic sonication pulses with controlled duty cycles to generate uniform microbubbles in the 1-10 μm size range. The periodic ultrasonic energy input creates consistent cavitation events that produce monodisperse microbubbles, simplifying the production process while maintaining precise size control required for medical applications.
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 system provides a stable and controlled supply of microbubbles that can maintain over half of their original gas payload for three weeks, ensuring minimal size change and rapid gas release when introduced into under-saturated solutions, meeting the demands of various applications, including medical gas delivery.
Implementation Method 1
An end of the sonicator member can be arranged so as to deliver ultrasonic energy to an interface between the lipid solution and the gas in the reaction volume
Implementation Method 2
The flow chamber can be configured to permit microbubbles generated in the reaction volume to be removed from the first outlet
Implementation Method 3
The method can also include, during the ultrasonically agitating, adjusting at least the first pressure based on a location of the interface in the reaction volume with respect to the end of the sonicator member. The method can further include ensuring the lipid solution ultrasonically agitated is saturated with a core gas to a level between 50% and 90%, inclusive, during the ultrasonically agitating
Data Source
AI summary
Gas-filled microbubbles can be synthesized using a continuous flow chamber and a sonicator. The resulting microbubble solution can be size-sorted for a particular application, such as injection into a patient for gas delivery thereto. The microbubble solution may be concentrated to have greater than 50% volume gas while maintaining microbubble sizes below 10 μm. Control of the microbubble generation process can yield highly stable microbubbles. The microbubbles may retain over half of their original gas payload for over three weeks while exhibiting minimal change in microbubble size. The systems, methods, and devices described herein thus allow for continuous or batch-wise continuous production of gas-filled microbubbles that readily release their gas payload when introduced into an under-saturated or de-saturated solution.