Diffusion matrix for transdermal drug administration and transdermal drug delivery devices including same
First Claim
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1. A diffusion matrix for use as a reservoir for a drug in a transdermal drug delivery device comprising a viscoelastic body of:
- (a) a reticulated macroporous polymeric foam framework;
(b) a viscoelastic drug-permeable hydrophobic polymer embedded in the pores of the foam; and
(c) a drug dispersed in and at least partly dissolved in the hydrophobic polymer that is capable of permeating through unbroken skin, the loading of drug in the polymer being in the range of about 1% to 20% by weight.
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Abstract
A solid state, resilient laminated composite for administering a drug transdermally consisting of a top layer of a resilient elastomer; a middle diffusion matrix layer composed of a polyurethane macroporous foam framework in whose pores are embedded a viscoelastic blend of a medical grade polysiloxane adhesive, drug, and optionally a percutaneous absorption enhancer, and a basal surface layer of the medical grade polysiloxane adhesive.
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Citations
30 Claims
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1. A diffusion matrix for use as a reservoir for a drug in a transdermal drug delivery device comprising a viscoelastic body of:
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(a) a reticulated macroporous polymeric foam framework; (b) a viscoelastic drug-permeable hydrophobic polymer embedded in the pores of the foam; and (c) a drug dispersed in and at least partly dissolved in the hydrophobic polymer that is capable of permeating through unbroken skin, the loading of drug in the polymer being in the range of about 1% to 20% by weight. - 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, 26, 27, 28, 29)
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30. A transdermal drug delivery device for administering a drug to a predetermined area of unbroken skin comprising a laminated composite that includes a diffusion matrix layer that contains the drug and a layer of a viscoelastic pressure sensitive adhesive that defines the basal surface of the composite and contacts and adheres to the skin when the device is in use, wherein the diffusion matrix layer is in the form of a macroporous polymeric foam in whose pores are embedded a dispersion of the drug in the pressure sensitive adhesive and the diffusion matrix layer contains a sufficient amount of the pressure sensitive adhesive to provide a means for replenishing the pressure sensitive adhesive in the pressure sensitive adhesive layer by flow of pressure sensitive adhesive from the diffusion matrix to said basal surface, whereby the device may be replaced or repositioned on the skin without significant loss of adhesiveness.
Specification