Bioabsorbable composites of derivatized hyaluronic acid
CA 2416126 C · Owner: Kuo, Jing-Wen · Inventors: Sadozai, Khalid K.; Sherwood, Charles H.; Kuo, Jing-Wen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a composite and a method for reducing postoperative adhesion of tissues. The composite includes a biocompatible biodegradable support, and a water-insoluble hyaluronic acid derivative at the support. The hyaluronic acid derivative includes an N-acylurea that results from cross-linking by the reaction of hyaluronic acid with a multifunctional carbodiimide. Optionally, a monocarbodiimide also may be employed. A pharmaceutically-active molecule may be added to the N-acylurea derivative of hyaluronic acid. Although the composite includes material that prevents adhesion between tissues, in order to reduce the need for suturing when the composite is being …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed May 22, 2001 and granted July 5, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 22, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 22, 2023.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.