Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Particulate form
Reexamination Certificate
2005-11-29
2005-11-29
Jones, Dwayne (Department: 1614)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Particulate form
C536S054000, C536S115000, C536S118000, C536S124000, C514S054000, C424S489000
Reexamination Certificate
active
06969531
ABSTRACT:
The present invention relates to microspheres comprising hyaluronan derivatized with a bifunctional crosslinker to form microspheres. Methods of making such microspheres, comprising mixing hyaluronic acid and a dihydrazide with a crosslinker in an aqueous solution, adding a solvent and an emulsifying agent to form an emulsion, and lowering the pH of the emulsion to allow intramolecular and intermolecular crosslinking to occur, are also disclosed. The invention also provides for pharmaceutical or cosmetic formulations based on the microspheres described herein, further containing one or more active or cosmetic agents, and methods of using such formulations.
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Dehazya Philip
Lu Cheng
Brown Melanie L.
Engelhard Corporation
Jones Dwayne
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