Polylactic acid microsphere, polylactic-co-glycolic acid microsphere and method of preparing the same
US12268784B2 · kind B2 · utility
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Inventors
Key dates
| Filing date | Dec 27, 2023 |
| Grant date | Apr 8, 2025 |
| Priority date | — |
| Expiry date | Dec 27, 2043 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K47/38
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A method of preparing polylactic acid (PLA) microsphere and polylactic-co-glycolic acid (PLGA) microsphere is provided, including the following steps. A first solution is provided, including polylactic acid or polylactic-co-glycolic acid and an organic solvent. A second solution is provided, including polyvinyl alcohol, sodium carboxymethyl cellulose and an aqueous solution. The first solution is added to the second solution and, at the same time, the second solution is agitated until polylactic acid is solidified to form a plurality of polylactic acid microspheres, or until polylactic-co-glycolic acid is solidified to form a plurality of polylactic-co-glycolic acid microspheres. The polylactic acid microspheres or polylactic-co-glycolic acid microspheres are collected. The polylactic acid microsphere and the polylactic-co-glycolic acid microsphere are respectively the accumulation of the polylactic acid and polylactic-co-glycolic acid, having a smooth surface and a mean number particle size distribution (MN) from 10 μm to 80 μm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.