Process of preparing microspheres for sustained release having improved dispersibility and syringeability

• Main Authors: KIM JUNG-SOO, SOEL EUN-YOUNG, CHAE YEON-JIN, CHOI HO-IL, SHIN EUN-HO, BAEK MI-JIN, BAEK MI-YOUNG, KIM SEONG-KYU, LEE HEE-YONG
• Format: Patent
• Language: English
• Published: 15.11.2007
• Subjects: HUMAN NECESSITIES; HYGIENE; MEDICAL OR VETERINARY SCIENCE; PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES

Disclosed is a process of preparing sustained release microspheres, containing a biodegradable polymer as a carrier and a drug, using spray drying. The process comprises preparing a solution, suspension or emulsion containing a biodegradable polymer, a drug and a solvent; spray drying the solution, suspension or emulsion; and suspending spray-dried microspheres in an aqueous solution containing polyvinyl alcohol to remove the residual solvent and increase the hydrophilicity of the microsphere surface. The process enables the preparation of microspheres having high drug encapsulation efficiency, almost not having a toxicity problem due to the residual solvent, and having good syringeability. The microspheres prepared according to the present invention release an effective concentration of a drug in a sustained manner for a predetermined period when administered to the body, and are thus useful in the treatment of diseases.