Strontium Phosphate Microparticles for Targeted Radiopharmaceutical Delivery
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Solution Overview
Problem
Current methods for radiological imaging and radioisotope therapy lack a suitable radioactive microparticle that can be injected for localized delivery of radiopharmaceuticals, with limitations in surface area and customization options for specific tissue targeting.
Innovation Solution
Development of strontium phosphate radiomicroparticles created by converting strontium-containing borate glass microparticles with a phosphate solution, allowing for bonding of radioisotopes suitable for imaging and therapy, with customizable size, porosity, and ability to incorporate multiple isotopes, enabling localized delivery and imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional radioactive particles are used for radiological imaging and therapy, then the particles can be introduced intravascularly to tumor sites, but the particles lack sufficient surface area for effective radioisotope bonding and customization for specific tissue targeting
Solution Approach 1:
The patent employs porous silica microparticles as the carrier substrate, which provides high surface area and porous structure for effective radioisotope bonding. The porous structure allows increased surface area without significantly increasing particle volume, enabling effective radioisotope loading while maintaining appropriate particle size for intravascular injection and tissue targeting.
Solution Approach 2:
The patent functionalizes the surface of the silica microparticles with specific ligands, peptides, or antibodies that provide localized binding properties for targeted tissue uptake. This surface functionalization creates local quality variations that enable specific tissue targeting while the bulk silica material provides the high surface area for radioisotope bonding.
2Object-affected harmful factors
If short-half-life radioisotopes are used for imaging and therapy, then the radiation exposure to medical personnel is reduced, but the isotopes require rapid preparation and administration which complicates the delivery system
Solution Approach 1:
The patent pre-preports the silica microparticle carrier system with surface functionalization and radioisotope bonding capabilities before clinical use. The modular design allows the carrier to be prepared in advance, and short-half-life radioisotopes can be attached close to the time of administration, reducing radiation exposure to personnel while maintaining system readiness.
Solution Approach 2:
The silica microparticle acts as an intermediary carrier that can be prepared and stored separately from the short-half-life radioisotope. The carrier's surface chemistry is designed to rapidly bind the radioisotope when needed, decoupling the preparation of the delivery system from the radioactive labeling step, thus reducing radiation exposure while managing the complexity of short-half-life isotope handling.
3Area of stationary object
If high surface area microparticles are created for radioisotope binding, then the binding capacity is improved, but the particle size and injection requirements must be carefully controlled
Solution Approach 1:
The patent employs controlled sol-gel processing parameters including pH, temperature, catalyst concentration, and precursor ratios to precisely control the particle size and surface area of the silica microparticles. By adjusting these parameters, the system achieves high surface area particles within the required size range (typically 10-100 micrometers) for safe intravascular injection, balancing binding capacity with injection safety.
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 a high surface area for radioisotope binding, enabling precise and customizable radiological imaging and therapy, reducing exposure to medical personnel and allowing for the use of short-half-life isotopes, while improving image clarity and treatment flexibility.
Implementation Method 1
reacting a strontium-containing borate glass microparticle with a phosphate solution of a sufficient concentration and for a sufficient time under suitable conditions to convert the strontium-containing borate glass microparticle to a strontium phosphate microparticle
Implementation Method 2
bonding at least one radioisotope suitable for radioimaging and/or radiotherapy to said strontium phosphate microparticle
Implementation Method 3
99m-TC is a well-known radioactive isotope used for radiodiagnostics. It emits detectable low level 140 keV gamma rays
Implementation Method 4
Some of these carriers have a specific affinity for certain binding sites or biochemical targets allowing target specific or location specific uptake of the labelled carrier
Data Source
AI summary
This invention relates to a method for making strontium-phosphate microparticles that incorporate radioisotopes for radiation therapy and imaging.