Details for Patent: 5,807,572

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Summary for Patent: 5,807,572

Title:	Multivesicular liposomes having a biologically active substance encapsulated therein in the presence of a hydrochloride
Abstract:	Disclosed are multivesicular liposomes containing biologically active substances, the multivesicular liposomes having defined size distribution, adjustable average size, adjustable internal chamber size and number, and a modulated rate of the biologically active substance in contrast to the previous art. The process comprises dissolving a lipid component in volatile organic solvents, adding an immiscible aqueous component containing at least one biologically active substance to be encapsulated, and adding to either or both the organic solvents and the lipid component, a hydrochloride effective to control the release rate of the biologically active substance from the multivesicular liposome, making a water-in-oil emulsion from the two components, immersing the emulsion into a second aqueous component, dividing the emulsion into small solvent spherules which contain even smaller aqueous chambers, and then removing the solvents to give an aqueous suspension of multivesicular liposomes encapsulating biologically active substances.
Inventor(s):	Kim; Sinil (Solana Beach, CA), Howell; Stephen B. (Del Mar, CA)
Assignee:	DepoTech Corporation (La Jolla, CA)
Application Number:	08/473,019
Patent Claim Types: see list of patent claims	Dosage form; Process; Device;

Drugs Protected by US Patent 5,807,572

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