MRI-Detectable Drug-Eluting Microspheres for Tumor Vascular Occlusion
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Solution Overview
Problem
Current treatments for solid tumors lack effective methods for vascular occlusion and targeted drug delivery directly to tumors, limiting the efficacy of chemotherapy and imaging capabilities.
Innovation Solution
Development of biomaterials in the form of drug-eluting, MRI-detectable microspheres composed of polymers like acrylate, vinyl sulfonate, and iron oxide particles, which can be administered to occlude blood vessels associated with tumors and deliver chemotherapeutic agents like doxorubicin or irinotecan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional chemotherapy is used to treat solid tumors, then systemic drug delivery is achieved, but the drug cannot be targeted specifically to tumors and vascular occlusion cannot be accomplished
Solution Approach 1:
The patent combines multiple functions into a single microsphere system: vascular occlusion (via embolic properties), drug delivery (chemotherapeutic agents), and imaging (MRI detectability using iron oxide). This merging resolves the contradiction by achieving high targeting precision through localized delivery while maintaining functional versatility through the multi-functional design of the microspheres.
Solution Approach 2:
The microspheres are designed to perform multiple functions simultaneously: they occlude blood vessels, deliver drugs, and provide imaging capability. This multi-functionality directly addresses the contradiction by enabling precise tumor targeting while maintaining the versatility needed for comprehensive cancer treatment.
2Reliability
If vascular occlusion is achieved using embolic agents, then blood flow to tumors is blocked, but targeted drug delivery capability is lost
Solution Approach 1:
The patent merges the vascular occlusion function and drug delivery function into a single integrated microsphere system. The microspheres simultaneously block blood flow and release chemotherapeutic agents, resolving the contradiction by maintaining both high occlusion reliability and sustained drug delivery efficiency through the dual-functional design.
3Measurement precision
If MRI detectable materials are incorporated into implants, then imaging and monitoring capabilities are enhanced, but the complexity of the biomaterial composition increases
Solution Approach 1:
The patent uses composite materials by incorporating iron oxide particles into the polymer matrix of the microspheres. This composite approach enhances MRI detectability while managing complexity through the use of well-established materials and straightforward composite fabrication methods.
4Productivity
If chemotherapeutic drugs are delivered systemically, then broad coverage is achieved, but the efficacy at the tumor site is limited due to lack of targeted delivery
Solution Approach 1:
The patent segments the drug delivery system into discrete microspheres that can be selectively delivered to tumor sites via catheter injection. This segmentation enables targeted delivery by dividing the therapeutic agent into controllable units that can be localized to specific vascular territories supplying the tumor, thereby improving both efficacy and targeting accuracy.
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 biomaterials enable precise vascular occlusion and targeted drug delivery to tumors, enhancing chemotherapy efficacy while allowing for MRI detection and monitoring.
Implementation Method 1
Magnetic Resonance Imaging ("MRI") detectable implants
Implementation Method 2
a drug is releasably associated with the microsphere
Data Source
AI summary
Biomaterials suitable for use as drug eluting, Magnetic Resonance Imaging (“MRI”) detectable implants for vascular occlusion are provided, as are methods of producing such biomaterials. Further, methods of treating an individual suffering from a solid tumor are provided.