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Erodible device comprising surfactant for modifying the rate of erosion of the device

  • US 4,322,323 A
  • Filed: 12/01/1980
  • Issued: 03/30/1982
  • Est. Priority Date: 12/01/1980
  • Status: Expired due to Term
First Claim
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1. A device for delivering a beneficial agent at a controlled rate over a prolonged period of time, wherein the device comprises (a) a shaped body sized and adapted for delivering an agent to an environment of use, the body formed of an erodible release rate controlling material, which material comprises a polymer of the formula:

  • ##STR4## wherein, R1 is a member selected from the group consisting of divalent, trivalent and titravalent radicals consisting of alkylene of 1 to 10 carbons;

    alkenylene of 2 to 10 carbons;

    alkyleneoxy of 2 to 6 carbons;

    cycloalkylene of 3 to 7 carbons;

    cycloalkylene of 3 to 7 carbons substituted with an alkyl of 1 to 7 carbons, alkoxy of 1 to 7 carbons, alkenyl of 2 to 7 carbons and alkylene of 1 to 10 carbons;

    cycloalkenylene of 4 to 7 carbons;

    cycloalkenylene of 4 to 7 carbons substituted with an alkyl of 1 to 7 carbons, an alkoxy of 1 to 7 carbons, an alkenyl of 2 to 7 carbons, and an alkylene of 1 to 7 carbons;

    arylene of 6 to 12 carbons;

    arylene of 6 to 12 carbons substituted with an alkyl of 1 to 7 carbons, an alkoxy of 1 to 7 carbons, and an alkenyl of 2 to 7 carbons;

    R2 and R3 are selected from the group consisting of alkyl of 1 to 7 carbons;

    alkenyl of 2 to 7 carbons, alkoxy of 1 to 7 carbons;

    alkylene of 1 to 7 carbons, alkenylene of 2 to 7 carbons;

    alkyloxy of 1 to 7 carbons;

    alkenyloxy of 2 to 7 carbons;

    alkyleneoxy of 1 to 7 carbons;

    alkenyleneoxy of 2 to 7 carbons;

    aryloxy of 6 to 12 carbons;

    aralkyleneoxy of 8 to 12 carbons;

    aralkenyleneoxy of 8 to 12 carbons;

    oxa;

    OR1 O wherein R1 is as defined above;

    a heterocyclic ring of 5 to 8 carbons and oxygen atoms formed when R2 and R3 are taken together;

    a heterocyclic ring of 5 to 8 carbon and oxygen atoms substituted with an alkyl of 1 to 7 carbons, an alkoxy of 1 to 7 carbons and an alkenyl of 2 to 7 carbons formed when R2 and R3 are taken together;

    a fused polycyclic ring of 8 to 12 carbon and oxygen atoms formed when R2 and R3 are taken together;

    a fused polycylic ring of 8 to 12 carbons and oxygen atoms substituted with an alkyl of 1 to 7 carbons, an alkoxy of 1 to 7 carbons, and an alkenyl of 2 to 7 carbons;

    wherein at least one of R2 and R3 is selected from the group consisting of alkoxy, alkenyloxy, and OR1 O; and

    R2 and R3 are taken together a member selected from the group of heterocyclic and fused polycyclic rings having at least one oxygen atom in the ring; and

    wherein n is greater than 10;

    (b) a beneficial agent in the body; and

    (c) a surfactant selected from the group consisting of anionic, cationic and nonionic surfactants.

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