Nanoporous Glass Microspheres for Radioactive Loading
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Solution Overview
Problem
Current radioactive microspheres for tumor therapy, such as Therasphere® and SIR-Spheres®, face challenges including the production of undesirable radionuclides during neutron activation, high glass density, and limitations in loading and diagnostic capabilities, which affect their therapeutic and diagnostic efficacy.
Innovation Solution
Development of nanoporous glass microspheres with a diameter range of 25 to 60 microns, loaded with high-purity radionuclides like Y-90 and In-111, which are embedded in nanopores to prevent washout, and can be produced using standard chemical methods without neutron activation, allowing for therapeutic and diagnostic applications with enhanced loading capacity and reduced density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If neutron activation is used to produce Y-90 in glass microspheres, then therapeutic radionuclide is generated, but undesirable radionuclides are also produced that are harmful in therapy
Solution Approach 1:
The patent extracts the radionuclide loading step from the glass manufacturing process itself. Instead of producing Y-90 within the glass matrix through neutron activation, the patent separates glass sphere production from radionuclide incorporation, loading Y-90 onto pre-formed glass spheres in a controlled post-processing step. This extraction eliminates the harmful byproducts of neutron activation while preserving the therapeutic radionuclide.
Solution Approach 2:
The patent performs preliminary action by manufacturing the glass microspheres first, then subsequently loading them with radionuclides. This sequence allows the glass matrix to be prepared without radiochemical contamination, and the radionuclide loading to occur under controlled conditions that prevent harmful radionuclide formation.
2Stability of the object's composition
If conventional glass microspheres are used, then structural stability is achieved, but high glass density causes excessive weight
Solution Approach 1:
The patent applies porous materials by incorporating a porous matrix (such as porous glass or glass-ceramic) into the microsphere structure. This porous structure reduces the overall density and weight of the microspheres while maintaining structural integrity and providing increased surface area for radionuclide loading, thereby resolving the contradiction between stability and weight.
3Quantity of substance
If radionuclides are loaded onto microsphere surface, then therapeutic effect is achieved, but radionuclides wash out into the tumor during therapy
Solution Approach 1:
The patent uses an intermediary binding mechanism where radionuclides are not directly attached to the glass surface but are instead bound through a intermediary layer or complexing agent on the porous surface. This intermediary structure anchors the radionuclides firmly, preventing washout during therapy while still allowing the radiation to reach the tumor tissue effectively.
4Quantity of substance
If neutron activation is used for radionuclide production, then Y-90 is produced, but complex nuclear reactor facilities are required
Solution Approach 1:
The patent extracts the radionuclide production process from nuclear reactor facilities and relocates it to controlled laboratory or clinical settings. By separating radionuclide loading from glass manufacturing and using alternative production methods (such as purchasing Y-90 from cyclotron facilities or other sources), the patent eliminates the need for complex nuclear reactor infrastructure while maintaining therapeutic radionuclide supply.
Data Source
AI summary
Microspheres made of solid glass are used in radiation therapy, wherein the radiotherapeutic radionuclide must be generated in the glass by neutron activation. Microspheres of this type have a high radioactive load, are relatively heavy and contain additional non-therapeutic radionuclides. In addition, radioactive microspheres made of plastic are used, which can be loaded with radionuclides by chemical means. These microspheres have a lower loading capacity, no additional radionuclides, and are lighter. The therapeutic radionuclide in both cases is Y-90. Microspheres made of nanoporous glass contain the therapeutic radionuclide, have a high loading capacity, require no neutron activation, can be parallel charged with multiple therapeutic and also with diagnostic radionuclides, and are very light. It is possible to produce them in a radiochemical laboratory. Microspheres of this type can also be used diagnostically in preparation for therapy. For this purpose, they can be provided in a therapeutically or diagnostically specified quantity and radioactivity.