Subdermally implantable device
First Claim
1. A subdermally implantable drug delivery device, comprising:
- a central core extending in an axial direction and having an outer surface and opposing ends, said core including a matrix of a pharmaceutically effective amount of a subdermally administrable drug substantially uniformly dispersed in a polymeric base material;
an intermediate layer comprising a porous polymeric material overlying said outer surface of said central core; and
an outer polymeric layer overlying said intermediate layer, wherein said intermediate layer controls the rate of diffusion of said drug from said central core to said outer layer.
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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-α-acetoxy-19-norprogesterone progestin; the polymeric base material and the outer polymeric layer each contain a polydimethylsiloxane such as Silastic®; 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.
87 Citations
29 Claims
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1. A subdermally implantable drug delivery device, comprising:
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a central core extending in an axial direction and having an outer surface and opposing ends, said core including a matrix of a pharmaceutically effective amount of a subdermally administrable drug substantially uniformly dispersed in a polymeric base material; an intermediate layer comprising a porous polymeric material overlying said outer surface of said central core; and an outer polymeric layer overlying said intermediate layer, wherein said intermediate layer controls the rate of diffusion of said drug from said central core to said outer layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A subdermally implantable drug delivery device, comprising:
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a central core extending in an axial direction and having an outer surface and opposing ends, said core including a matrix of a pharmaceutically effective amount of a contraceptive agent substantially uniformly dispersed in a first polydimethylsiloxane elastomeric material; an intermediate cellulosic layer overlying said outer surface of said central core; and an outer layer of a second polydimethylsiloxane elastomeric material overlying said intermediate cellulosic layer, wherein said intermediate cellulosic layer controls rate of diffusion of said contraceptive agent from said central core to said outer layer. - View Dependent Claims (27, 28, 29)
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Specification