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Summary for Patent: 4,849,224
|Title:||Device for administering an active agent to the skin or mucosa|
|Abstract:||A transdermal drug delivery device comprising a drug formulation-containing reservoir defined by a backing layer and a drug-permeable membrane layer, a ring-shaped layer made of an adhesive that is incompatible with one or more components of the drug formulation that is peripheral to the reservoir outwardly of the membrane layer and a peelable liner layer that underlies at least the membrane layer with a first heat seal between the backing and the membrane about the perimeter of the reservoir and another concentric heat seal between the backing and the release liner positioned outwardly of the first heat seal, the heat seals providing barriers that isolate the drug formulation from the adhesive.|
|Inventor(s):||Chang; Yunik (Toms River, NJ), Patel; Dinesh C. (Murray, UT), Ebert; Charles D. (Salt Lake City, UT)|
|Assignee:||TheraTech Inc. (Salt Lake City, UT)|
1. A device for administering an active agent to the skin or mucosa of an individual comprising a laminated composite of:
(a) a backing layer;
(b) an active agent-permeable membrane, the backing layer and membrane defining
(c) a reservoir therebetween that contains a formulation of the active agent, said reservoir having a smaller periphery than the backing layer and membrane such that a portion of the backing layer and membrane extends outwardly of the periphery of the reservoir;
(d) a first peelable active agent formulation-impermeable layer that underlies the reservoir and a portion of said outwardly extending portion of the backing layer and membrane;
(e) an adhesive layer that underlies and covers the first peelable active agent formulation-impermeable layer and said outwardly extending portion of the backing layer and membrane;
(f) a second peelable active agent formulation-impermeable layer that underlies and covers the adhesive layer;
(g) a permanent heat seal about the periphery of the reservoir between the backing layer and the membrane; and
(h) a peelable heat seal outwardly of the permanent heat seal between the backing and the first peelable active agent formulation-impermeable layer, the peel strengths between the adhesive layer and the first and second peelable active agent impermeable layers being greater than the force required to break the peelable heat seal whereby when the second peelable layer is removed from the device, the peelable heat seal is broken and the first peelable layer and underlying portion of the adhesive layer is removed therewith.
2. The device of claim 1 wherein the adhesive is incompatible with one or more of the components of the formulation that permeate through the membrane to the skin or mucosa.
3. The device of claim 1 wherein the backing layer is a laminated composite of at least one layer that is impermeable to the formulation and an inner heat-sealable layer.
4. The device of claim wherein the adhesive is an acrylic adhesive, the active agent is pindolol hydrochloride, and the formulation includes isopropyl alcohol and methyl laurate.
5. The device of claim 4 wherein the membrane is a microporous polyethylene membrane.
6. The device of claim 1 wherein the adhesive is an acrylic adhesive, the active agent is nicardipine hydrochloride, and the formulation includes isopropyl alcohol and methyl laurate.
7. The device of claim 1 wherein the adhesive is an acrylic adhesive, the active agent is calcitriol and the formulation includes ethanol, methyl laurate, and water.
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