Transdermal delivery device
View Patent ↗A dermal, transdermal, mucosal or transmucosal delivery device includes a backing layer overlying an ingredient containing reservoir, and having a microprotrusion array attached thereto, a cover for the reservoir having at least one opening therethrough, an adhesive layer and a liner layer. Upon removal of the liner layer, the device may be placed over the desired area of the skin or mucosa and adhesively applied thereto allowing the ingredients to flow from the reservoir through the at least one opening to the skin or mucosa.
1. A transdermal delivery device, comprising:
a reservoir containing ingredients and defining a perimeter;
a backing member overlying the reservoir, the backing member being made of a material which is substantially impermeable to the ingredients contained in the reservoir;
a cover for the reservoir, the cover being made of a material substantially impermeable to ingredients contained in the reservoir, but having at least one opening therein defining a perimeter, such that ingredients from the reservoir flow through the opening, but will not readily flow through the material of which the cover is made;
a first seal sealing the cover to the backing member at the perimeter of the reservoir, wherein the first seal which is not subject to permeation, disintegration or degradation by any ingredient contained in the reservoir;
an adhesive layer adhered to the backing member for adhering the device to a patient's skin or mucosa, the adhesive layer not extending to the perimeter of the opening in the cover, such that a portion of the cover surrounding said perimeter of the opening is exposed to thereby define a cover sealing surface;
an ingredient containing material layer at least partially adhered to the adhesive layer, wherein the ingredient containing material does not extend to the perimeter of the opening;
a liner covering the sealing surface of the cover and the opening in the cover;
a second seal releasably sealing the liner to the sealing surface of the cover, wherein the second seal is not subject to permeation, disintegration or degradation by any ingredient in the reservoir; whereby ingredients in the reservoir are sealed therein during storage and non-use by the first and second seals, the cover and liner, but are free to flow through the opening and onto a subject's skin or mucosa when the liner is removed from the device and the device is applied to such skin or mucosa.
2. The device of claim 1 , further including a microprotrusion layer at least partially adhered to the adhesive layer, the microprotrusion layer including at least one opening therethrough substantially aligned with the opening in the cover, such that ingredients from the reservoir may flow through the opening, and wherein the microprotrusion layer pierces at least a portion of the skin or mucosa when the device is applied to a subject's skin or mucosa;
the opening in the ingredient containing material layer being sufficiently large that the microprotrusion layer is positioned within the opening in the ingredient containing material layer.
3. The device of claim 2 , wherein the liner is a release liner for the device, the release liner covering the microprotrusion layer and the adhesive layer as well as the sealing surface and the opening of the cover.
4. The device of claim 3 , wherein the first and second seals comprise heat seals between the cover and the backing member and between the liner and the cover respectively.
5. The device of claim 2 , wherein a rate-controlling membrane is disposed between the cover and the reservoir.
6. The device of claim 2 , wherein a rate controlling membrane is disposed between the cover and the adhesive layer.
7. The device of claim 2 , wherein the microprotrusion layer includes a plurality of openings therethrough.
8. The transdermal delivery device of claim 2 , wherein the microprotrusion layer comprises a biodegradable, biocompatible polymer chosen from the group consisting of poly(lactide)s, poly(glycolide)s, poly(lactide-co-glycolide)s, polyanhydrides, polyorthoesters, polyetheresters, polycaprolactones, polyesteramides, poly(butyric acid), poly(valeric acid), polyurethanes and copolymers and blends thereof.
9. The device of claim 1 , wherein the liner is a composite member comprising:
an outer protective layer and a barrier layer with an adhesive coating therebetween, the barrier layer defining an exposed surface, the outer protective layer further including a release coating on the exposed surface of the barrier layer; and wherein
the barrier layer, including its adhesive coating and its release coating, has an opening therein which is sufficiently large to expose the opening and the sealing surface of the cover, whereby the outer protective layer is sealed directly to the sealing surface of the cover by the second seal.
10. The device of claim 9 , wherein the release coating of the liner is releasably adhered to the second adhesive coating of the adhesive layer.
11. The device of claim 1 , wherein the reservoir includes first and second compartments that are sealed from one another.
12. The device of claim 1 , including a pump operably connected to the reservoir for pressurizing the reservoir.
13. The device of claim 12 , wherein the pump comprises a syringe.
14. The device of claim 13 , wherein the pump is connected to the reservoir by a conduit and a releasable fitting.
15. The device of claim 12 , wherein the pump is connected to the reservoir by a needle that extends through a resealing port including a film layer attached to the reservoir.