INJECTABLE BIODEGRADABLE BLOCK COPOLYMER GELS FOR USE IN DRUG DELIVERY
    2.
    发明公开
    INJECTABLE BIODEGRADABLE BLOCK COPOLYMER GELS FOR USE IN DRUG DELIVERY 审中-公开
    注射生物可降解嵌段共聚物的凝胶FOR USE IN药品管理

    公开(公告)号:EP1024790A1

    公开(公告)日:2000-08-09

    申请号:EP98940801.8

    申请日:1998-08-08

    摘要: A system and method for the parenteral delivery of a drug in a biodegradable polymeric matrix to a warm blooded animal as an aqueous liquid with the resultant formation of a hydrogel depot for the controlled release of the drug. The system comprises an injectable biodegradable block copolymeric drug delivery liquid having thermal gelation properties. The copolymer has a gel/sol transition temperature such that, above the body temperature of the animal to which it is administered, it is a solution and when administered and cooled to body temperature it forms a hydrogel. The copolymer is made up of (i) a hydrophobic A polymer block of poly (α-hydroxy acid) and (ii) a hydrophilic B polymer block comprising a poly(ethylene oxide). The drug is released at a controlled rate from the copolymer which biodegrades into non-toxic products. The gel/sol transition temperature and degradation rate can be adjusted by proper selection of the molecular weight and concentration of the poly (α-hydroxy acid) and poly(ethylene oxide) polymer block components.