Imageable embolic microsphere

Patent metadata

Field	Value
Publication number	US-10307493-B2
Application number	US-201414777168-A
Country	US
Kind code	B2
Filing date	Mar 14, 2014
Priority date	Mar 15, 2013
Publication date	Jun 4, 2019
Grant date	Jun 4, 2019

Abstract

This invention concerns imageable, radiopaque embolic beads, which are particularly useful for monitoring embolization procedures. The beads comprise iodine containing compounds which are covalently incorporated into the polymer network of a preformed hydrogel bead. The beads are prepared by activating pre-formed hydrogel beads towards nucleophilic attack and then covalently attaching iodinated compounds into the polymer network. The radiopaque beads may be loaded with chemotherapeutic agents and used in methods of embolizing hyperplastic tissue or solid tumors.

First claim

The invention claimed is:

1. A radiopaque hydrogel microsphere comprising functional groups on a preformed crosslinked polyvinyl alcohol (PVA) hydrogel microsphere that have been activated towards nucleophilic substitution reaction with carbonyl diimidazole or carbodiimide, wherein the carbonyl diimidazole or carbodiimide is configured to react with an aromatic iodine containing compound and covalently bind the aromatic iodine containing compound to the hydrogel microsphere.

2. A radiopaque hydrogel microsphere according to claim 1 wherein the iodine containing compound is an iodinated benzyl or phenyl alcohol or is an iodinated benzoic acid.

3. A radiopaque hydrogel microsphere according to claim 1 wherein the iodine containing compound is 2,3,5-triiodobenzoic acid.

4. A radiopaque hydrogel microsphere according to claim 1 in which the hydrogel microsphere has been pre-formed from a polymer which has alcoholic hydroxyl substituents or acylated derivatives thereof.

5. A radiopaque hydrogel bead microsphere according to claim 1 in which the hydrogel microsphere has been pre-formed from a crosslinked polyvinyl alcohol which has been formed by copolymerizing ethylenically unsaturated polyvinyl alcohol macromer with ethylenically unsaturated comonomer.

6. A radiopaque hydrogel microsphere according to claim 1 in which the ethylenically unsaturated polyvinyl alcohol macromer comprises pendant ethylenic groups are linked via cyclic acetal linkages with oxygen atoms from adjacent hydroxyl groups, formed by the reaction of N-acrylaminoacetaldehyde dimethyl acetal.

7. A radiopaque hydrogel microsphere according to claim 1 in which the hydrogel comprises polyvinyl alcohol partially acetalized with N-formylmethyl acrylamide copolymerized with 2-acrylamido-2-methylpropane sulfonate sodium salt.

8. The radiopaque hydrogel microsphere according to claim 1 , further comprising a pharmacologically active agent absorbed within the microsphere.

9. The radiopaque hydrogel microsphere according to claim 8 , wherein the pharmacologically active agent is an antiangiogenic or a chemotherapeutic drug.

10. The radiopaque hydrogel microsphere according to claim 8 , wherein the pharmacologically active agent is doxorubicin.

Assignees

• Biocompatibles Uk Ltd
• Dreher Matthew R
• Wood Bradford J
• Negussie Ayele H
• Lewis Andrew Leonard
• Tang Yiqing
• Biocompatible Uk Ltd
• Nat Institutes Of Health

Inventors

• Dreher Matthew R
• Wood Bradford J
• Negussie Ayele H
• Lewis Andrew Leonard
• Tang Yiqing

Classifications

• A61P35/00

  Antineoplastic agents · CPC title

• A61P43/00

  Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00 · CPC title

• A61P9/00

  Drugs for disorders of the cardiovascular system · CPC title

• C08L29/04

  Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids · CPC title

• A61K49/0442 Primary

  Polymeric X-ray contrast-enhancing agent comprising a halogenated group · CPC title