Strontium Phosphate Microparticles for Customizable Radiomicroparticle Dosing
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Solution Overview
Problem
Current radioactive microparticles for medical therapy and imaging lack flexibility in radionuclide selection and dosing, are limited by half-life considerations, and have limitations in manufacturing processes that can degrade or vaporize certain isotopes, leading to suboptimal imaging and treatment outcomes.
Innovation Solution
Development of porous strontium phosphate microparticles with a crystalline surface layer that allows for the adsorption of multiple radioisotopes, enabling customizable dosing and imaging, and avoiding the limitations of existing manufacturing processes by bonding radioisotopes in situ just prior to use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional radioactive microparticles are used, then imaging and therapy can be performed, but flexibility in radionuclide selection and dosing is limited
Solution Approach 1:
The microparticle is divided into distinct functional components: a porous core structure for radionuclide loading and a separate surface layer for imaging agent attachment. This segmentation allows independent optimization of each component and enables flexible combination of different radionuclides without requiring complete remanufacturing of the particle system.
Solution Approach 2:
The microparticle system is designed with universal applicability across multiple radionuclides and imaging modalities. The porous strontium phosphate core can accommodate various radionuclides (beta-emitters, alpha-emitters, gamma-emitters), while the surface can be functionalized with different imaging agents, creating a universal platform for both therapy and diagnostics.
2Ease of manufacture
If manufacturing processes are used that involve high temperature or vaporization, then particles can be formed, but certain short half-life isotopes are degraded or vaporized
Solution Approach 1:
The porous strontium phosphate core structure is pre-formed through low-temperature aqueous precipitation processes before radionuclide loading. This preliminary formation of the particle scaffold avoids high-temperature processing that would degrade short half-life isotopes, while still achieving the desired porous structure and surface area for effective radionuclide loading.
3Quantity of substance
If non-porous microparticles are used, then manufacturing is simpler, but surface area for radioisotope binding is reduced
Solution Approach 1:
The microparticle employs a porous strontium phosphate core structure created through controlled precipitation and drying processes. This porosity increases the internal surface area by orders of magnitude compared to dense particles, providing extensive binding sites for radionuclides while maintaining a manageable particle size and simplified manufacturing approach through aqueous chemistry.
4Measurement precision
If microparticles with low radiopacity are used, then imaging is less clear, but radiopaque materials may increase particle size
Solution Approach 1:
The microparticle utilizes a composite structure combining strontium phosphate (inherent radiopacity) with barium sulfate coating (enhanced radiopacity). This composite approach amplifies the radiographic signal for clearer imaging while maintaining small particle dimensions, as the barium sulfate layer provides high radiopacity per unit volume without significantly increasing overall particle size.
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 strontium phosphate microparticles provide enhanced radiopacity, increased surface area for effective radioisotope binding, and the ability to use short half-life isotopes, allowing for patient-specific dosing and improved therapeutic and diagnostic outcomes while minimizing exposure to medical personnel.
Implementation Method 1
reacting a strontium-containing borate glass microparticle with a phosphate solution in amounts and for a sufficient time under suitable conditions to convert at least a portion strontium-containing borate glass at the surface to crystalline strontium phosphate
Implementation Method 2
bonding or adsorbing at least one radioisotope suitable for radio imaging and/or radiotherapy to the surface of said microparticle
Data Source
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AI summary
This invention relates to porous microparticulate carriers that incorporate radioisotopes to form radiomicroparticles for radiation therapy and imaging. The invention also provides methods of preparing the microparticles and methods of treatment using the radiomicroparticles.