Porphyrin-Phospholipid Microbubble Shell Stability and Imaging
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Solution Overview
Problem
Current microbubbles used in ultrasound imaging have stability issues due to the incorporation of fluorophores, which affect the shell's integrity and longevity, and lack optimal multimodal imaging capabilities.
Innovation Solution
Development of microbubbles with a porphyrin-phospholipid shell, where porphyrin is covalently attached to a lipid side chain, forming a monolayer with a PEGylated emulsifier, enhancing stability and multimodal imaging properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fluorophores are incorporated into the microbubble shell to verify binding and disruption, then imaging capability is improved, but microbubble shell stability deteriorates
Solution Approach 1:
The patent uses porphyrin-phospholipid conjugates as composite materials that combine the structural properties of phospholipids with the imaging properties of porphyrins. This integration allows the shell to maintain stability while providing robust intrinsic multimodal imaging capabilities through fluorescence, photoacoustic, MR and PET imaging modes.
Solution Approach 2:
The patent merges the structural function of phospholipid shells with the imaging function of porphyrins by covalently attaching porphyrin to the phospholipid side chain. This creates a unified material that simultaneously provides both shell integrity and imaging capability, eliminating the need to add separate fluorophore molecules that would compromise stability.
2Stability of the object's composition
If porphyrin-phospholipid conjugate is used to form the microbubble shell, then stability and shell stiffness are improved, but device complexity increases
Solution Approach 1:
The patent modifies the chemical structure of phospholipids by attaching porphyrin groups to their side chains at specific positions (sn-1 or sn-2). This parameter change in the molecular structure provides both enhanced stability and imaging capability without fundamentally changing the overall shell architecture or self-assembly behavior of the microbubbles.
Solution Approach 2:
The porphyrin-phospholipid conjugates self-assemble into stable monolayer shells through their inherent amphiphilic properties, without requiring complex external stabilization mechanisms. The conjugated structure inherently provides both structural integrity and imaging functionality, making the system self-sufficient.
3Adaptability or versatility
If porphyrin-phospholipid conjugate is incorporated into the microbubble shell, then multimodal imaging capability is improved, but manufacturing complexity increases
Solution Approach 1:
The porphyrin-phospholipid conjugates are pre-synthesized with porphyrin attached to the phospholipid side chain before microbubble formation. This preliminary preparation ensures that the imaging capability is built-in from the start, eliminating the need for post-formation modification steps and simplifying the overall manufacturing process despite the complexity of the conjugated structure.
Solution Approach 2:
The porphyrin-phospholipid conjugate serves multiple functions simultaneously: it provides structural stability as a shell component, enables fluorescence imaging, photoacoustic imaging, MR imaging, and PET imaging. This multi-functionality is achieved through a single material design, reducing the need for multiple separate components and simplifying manufacturing.
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 porphyrin-phospholipid microbubbles demonstrate improved stability, monodispersity, and enhanced ultrasound and photoacoustic imaging capabilities, with a longer half-life in serum and increased shell stiffness, suitable for various clinical and diagnostic applications.
Implementation Method 1
microbubbles are typically formed from fluorinated gases incorporated into a self-assembled phospholipid shell
Implementation Method 2
the porphyrin-phospholipid microbubbles demonstrate improved stability, monodispersity, and enhanced ultrasound and photoacoustic imaging capabilities, with a longer half-life in serum and increased shell stiffness
Implementation Method 3
Microbubbles are gas-filled microspheres which confer acoustic contrast for ultrasound imaging
Implementation Method 4
Ultrasound is one of the most affordable and accessible imaging modalities
Implementation Method 5
the porphyrin-phospholipid microbubbles demonstrate improved stability, monodispersity, and enhanced ultrasound and photoacoustic imaging capabilities
Data Source
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AI summary
The present invention relates to a microbubble comprising a monolayer of porphyrin-phospholipid conjugate, said microbubble having encapsulated therein, and to the use of said microbubble in ultrasound imaging of a target area in a subject.