Stimuli-Responsive Polymeric Gas Particles for Stable Oxygen Delivery
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Solution Overview
Problem
Current microbubble formulations for oxygen delivery are unstable, prone to breaking under high shear forces, and have a short shelf life due to lipid oxidation and hydrolysis, leading to potential pulmonary embolism and inadequate oxygen supply in hypoxic conditions.
Innovation Solution
Development of gas-filled stable particles with a stimuli-responsive polymeric shell that remains stable until activated by physiological pH, allowing for controlled release of oxygen and minimizing the risk of vascular obstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lipid-based microbubbles are used for oxygen delivery, then oxygen can be delivered to hypoxic subjects, but the microbubbles are unstable and break under high shear forces causing pulmonary embolism
Solution Approach 1:
The patent changes the material parameter from lipid to polymer, which fundamentally alters the mechanical properties and stability of the microbubbles. Polymer-based microbubbles exhibit higher mechanical strength and resistance to shear forces, preventing rupture and pulmonary embolism while maintaining oxygen delivery capability
Solution Approach 2:
The patent employs composite material structure with polymer shell encapsulating gas core, creating a more robust system. The polymer-gas composite provides both structural integrity for stability and functional properties for oxygen delivery, resolving the contradiction between stability and safety
2Duration of action of stationary object
If lipid-based microbubbles are used for oxygen delivery, then oxygen supply is restored in hypoxic conditions, but the microbubbles have short shelf life due to lipid oxidation and hydrolysis
Solution Approach 1:
The patent changes the chemical composition parameter from lipid to polymer, which fundamentally improves storage stability. Polymers are resistant to oxidation and hydrolysis that plague lipid-based systems, extending shelf life from days to months while maintaining structural integrity and oxygen delivery function
Solution Approach 2:
The patent creates a stable, reusable formulation that eliminates the need for frequent replacement due to degradation. The polymer-based microbubbles can be stored for extended periods without losing efficacy, making them practical for clinical use
3Ease of operation
If stabilized particles with stimuli-responsive shell are used, then gas release is controlled upon activation, but the particle structure becomes more complex
Solution Approach 1:
The patent incorporates stimuli-responsive polymers that dynamically change properties in response to environmental triggers such as pH or temperature. This dynamic behavior enables controlled gas release at the target site without requiring complex mechanical structures, achieving ease of operation through smart material response
Solution Approach 2:
The patent replaces complex mechanical release mechanisms with chemical stimuli-responsive behavior. Instead of mechanical valves or pumps, the system uses pH-sensitive or temperature-sensitive polymer properties to automatically control gas release, simplifying the overall structure while maintaining controlled delivery
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 stable particles effectively deliver oxygen to hypoxic subjects, maintaining stability during storage and infusion, reducing the risk of embolism and ensuring consistent oxygen supply, thereby improving survival rates in asphyxial cardiac arrest scenarios.
Implementation Method 1
the polymeric shell of the particles may dissolve immediately upon activation of the release trigger. For instance, upon activation of a release trigger by a pH change, for example resulting from administration of the particles into blood by infusion from a solution having a significantly different pH, the particle releases the gas
Data Source
AI summary
Provided herein are various gas-filled particles having a stimuli-responsive shell encapsulating the gas. The stimuli-responsive shell comprises one or more release triggers. Compositions for medical or non-medical applications, methods of use and treatment, and methods of preparation are also described.