ALEXANDRIA, Va., Feb. 17 -- United States Patent no. 12,552,891, issued on Feb. 17, was assigned to GUERBET (Villepinte, France).
"Non-degradable embolisation microsphere" was invented by Caroline Robic (Nogent sur Marne, France) and Mohsen Dahesh (Epinay sur Seine, France).
According to the abstract* released by the U.S. Patent & Trademark Office: "The invention relates to non-biodegradable embolisation microspheres comprising a cross-linked matrix, the matrix being based on at least: a) from 20% to 95% of hydrophilic monomer; b) from 1% to 15% of a non-biodegradable hydrophilic cross-linking monomer; and c) from 1.5% to less than 6% of transfer agent selected from alkyl halides and cycloaliphatic or aliphatic thiols having in particular...