Dual-Mode Contrast Agent with Drug-Loaded Nanoparticles
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Solution Overview
Problem
Current contrast agents for ultrasound and photoacoustic imaging have limited capacity for drug loading, making it difficult to enhance treatment effects simultaneously with diagnosis, and are not suitable for dual-modality imaging.
Innovation Solution
A dual-purpose contrast agent comprising a microbubble containing gas and porphyrin, combined with nanoparticles bound on its surface that carry a drug, allowing for both ultrasound and photoacoustic image diagnosis with enhanced accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional contrast agents are used for ultrasound or photoacoustic imaging, then imaging capability is achieved, but drug loading capacity is limited and treatment enhancement is difficult
Solution Approach 1:
The patent embeds nanoparticles containing drugs within the microbubble structure. The nanoparticles are positioned inside the microbubble cavity, creating a nested configuration where the microbubble serves as a container for both the gas required for ultrasound contrast and the drug-loaded nanoparticles for therapeutic delivery. This nesting approach increases drug loading capacity while maintaining imaging functionality.
Solution Approach 2:
The patent creates a composite contrast agent system combining microbubbles with nanoparticles. The microbubble provides ultrasound contrast properties while the nanoparticles contribute drug delivery capabilities and photoacoustic signal enhancement. This composite structure enables simultaneous diagnosis and treatment functions that single agents cannot achieve.
2Adaptability or versatility
If single-modality contrast agents are used, then imaging specificity is maintained, but comprehensive diagnostic capability is insufficient
Solution Approach 1:
The patent designs a universal contrast agent that performs multiple functions: ultrasound imaging through microbubble acoustic reflection, photoacoustic imaging through porphyrin absorption, and drug delivery through nanoparticle载药. This multi-functional design allows a single agent to serve across different imaging modalities and therapeutic applications, eliminating the need for separate agents for each function.
3Quantity of substance
If contrast agents are designed for high drug loading, then treatment effectiveness improves, but imaging quality may deteriorate
Solution Approach 1:
The patent segments the contrast agent into distinct functional components: the microbubble structure handles ultrasound imaging, the porphyrin molecules handle photoacoustic imaging, and the nanoparticles handle drug delivery. This segmentation allows each component to optimize its specific function without compromising the others, as the microbubble provides the structural framework that accommodates nanoparticles while maintaining acoustic properties.
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 contrast agent significantly increases the accuracy of photoacoustic images and enables simultaneous diagnosis and treatment by effectively delivering drugs to cancer tissues, utilizing the enhanced permeability and retention effect.
Implementation Method 1
When an ultrasound contrast agent is administered to a subject, and then ultrasound is applied to the subject, the ultrasound waves are reflected by microbubbles in the contrast agent, making the image of an internal organ more obvious.
Implementation Method 2
when laser is irradiated onto a biological tissue, acoustic pressure is generated from a tissue site which acts as a source of generating initial ultrasound waves in the tissue as a short electromagnetic pulse of the laser is absorbed in the biological tissue
Implementation Method 3
effectively delivering drugs to cancer tissues, utilizing the enhanced permeability and retention effect
Data Source
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AI summary
The present invention provides a dual-purpose photoacoustic tomography (PAT)/ultrasound contrast agent comprising: (a) a micro-bubble containing gas and porphyrin therein; and (b) nanoparticles bound on a surface of the micro-bubble and containing a drug. The contrast agent of the present invention can be used in both the ultrasound diagnosis and the photoacoustic image diagnosis, and can significantly increase the accuracy of photoacoustic images.