Subdermally implantable device

Details Subdermally implantable device Subdermally implantable device

1994-11-02

1997-08-26

Azpuru, Carlos

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Implant or insert

5147723, 514781, A61F 202, A61K 4730, A61K 4738

Patent

active

056608489

ABSTRACT:
Disclosed is a subdermally implantable drug-delivery device, which contains: a central core extending in an axial direction and having an outer surface and opposing ends, which core includes a matrix of a pharmaceutically effective amount of a subdermally administrable drug substantially uniformly dispersed in a polymeric base material; an intermediate polymeric layer overlying the outer surface of the central core; and an outer polymeric layer overlying the intermediate layer, wherein the intermediate layer controls the rate of diffusion of the drug from the central core to the outer layer. In preferred embodiments, the subdermally administrable drug is a contraceptive agent such as the 16-methylene-17-.alpha.-acetoxy-19-norprogesterone progestin; the polymeric base material and the outer polymeric layer each contain a polydimethylsiloxane such as Silastic.RTM.; and the intermediate layer contains a porous material such as cellulose. The devices provide for the substantially zero-order release of the drug for their intended lifetime without initial overdosing of the drug.

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