Perfluoropentane Microbubble Stability via Partial Pressure Control
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Solution Overview
Problem
Current ultrasound contrast agents based on perfluoropropane microbubbles have stability issues in the bloodstream and acoustic pressure, while attempts with perfluoropentane microbubbles have been unsuccessful due to perfluoropentane remaining in the liquid state in vivo, failing to vaporize and function effectively as ultrasound contrast agents.
Innovation Solution
A method of forming microbubbles with a shell encapsulating perfluoropentane gas, using a stabilizing material and a partial pressure of insoluble gases like perfluoropentane, which are shaken to create stable foam with a narrow size distribution, enhancing their stability and echogenicity for medical imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If perfluoropentane is used as the gas core material, then the microbubbles can remain in liquid state for stable storage, but they fail to vaporize effectively in vivo to produce sufficient echogenicity for ultrasound imaging
Solution Approach 1:
The patent changes the physical state parameter of perfluoropentane from liquid to gas by controlling the partial pressure environment during microbubble formation. By maintaining a partial pressure of perfluoropentane gas of at least 0.2 atm during formation, the microbubbles contain gas core material that can effectively vaporize in vivo to produce sufficient echogenicity for ultrasound imaging.
Solution Approach 2:
The patent utilizes phase transition principles by controlling the phase state of perfluoropentane during microbubble formation and storage. The microbubbles are formed with perfluoropentane in gas phase under controlled partial pressure, allowing them to maintain gas core structure that can effectively vaporize in vivo, while the controlled environment prevents unwanted phase changes during storage.
2Ease of manufacture
If simple air bubbles are used as contrast agents, then the manufacturing process is simple, but the useful lifespan is short due to water-soluble gases leaking into the surrounding solution
Solution Approach 1:
The patent uses perfluoropentane, an inert gas with very low water solubility, to replace water-soluble gases in air bubbles. This inert atmosphere prevents gas leakage into the surrounding aqueous solution, extending the useful lifespan of the microbubbles while maintaining ease of manufacture through simple mixing processes.
Solution Approach 2:
The patent creates a composite microbubble structure combining perfluoropentane gas core with stabilizing materials such as phospholipids or proteins. This composite structure provides both the gas-filled core for echogenicity and the stabilizing shell that prevents gas dissolution, achieving long lifespan while maintaining manufacturing simplicity.
3Duration of action of moving object
If heavy gases with low water solubility are used to extend bubble lifespan, then the useful life increases, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent optimizes the partial pressure parameter of perfluoropentane during microbubble formation to achieve the desired balance between lifespan extension and manufacturing simplicity. By controlling the partial pressure to be at least 0.2 atm, the process achieves effective gas retention without requiring complex high-pressure equipment, maintaining manufacturing simplicity while extending useful lifespan.
4Ease of operation
If microbubbles are made smaller than 6 micrometers to flow through the circulatory system, then the ability to freely flow through vessels is improved, but the stability under acoustic pressure decreases
Solution Approach 1:
The patent creates a composite microbubble structure with a perfluoropentane gas core and a stabilizing shell made of phospholipids or proteins. This composite structure provides mechanical strength to resist acoustic pressure while maintaining the small size needed for circulatory flow. The stabilizing shell acts as a protective barrier that enhances acoustic pressure resistance without significantly increasing the overall microbubble diameter.
Solution Approach 2:
The use of perfluoropentane as an inert gas with low water solubility provides internal pressure stability that helps the microbubbles maintain their structural integrity under acoustic pressure. This inert atmosphere contributes to the overall pressure resistance of the microbubbles while maintaining their small size for effective circulatory flow.
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 perfluoropentane-based microbubble composition achieves improved stability and echogenicity, allowing for effective ultrasound imaging with enhanced resistance to static and acoustic pressures, and a longer shelf life, outperforming previous compositions in terms of bubble production and stability.
Implementation Method 1
a second volume of a mixture comprising one or more microbubble stabilizing materials
Implementation Method 2
introducing a gas into said sealed container, and shaking the container to form said plurality of microbubbles
Data Source
AI summary
A method of forming a plurality of microbubbles, wherein the method disposes in a sealed container comprising a first volume at ambient pressure, a second volume of a mixture comprising one or more microbubble stabilizing materials. The first volume is greater than said second volume. The method further comprises sealing said container, introducing a gas into said sealed container, and shaking the container to form said plurality of microbubbles.