Multilayer drug delivery system with barrier against reservoir material flow
First Claim
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1. A device for administration of a pharmaceutical agent to an individual through a body surface, comprising:
- a. a reservoir having a first matrix comprising at least one pharmaceutical agent in the first matrix, the reservoir having a reservoir outer perimeter;
b. a first backing layer attached to the reservoir and substantially impermeable to the pharmaceutical agent, the first backing layer having a first backing layer outer perimeter;
c. a second matrix layer permeable to the pharmaceutical agent, the second matrix layer having a second matrix layer outer perimeter; and
d. a barrier layer disposed between the reservoir and at least part of the second matrix layer, the barrier layer having a barrier layer outer perimeter that is smaller than the second matrix layer outer perimeter, the reservoir outer perimeter being smaller than the barrier layer outer perimeter, the barrier layer being of a material that is substantially impermeable to the pharmaceutical agent wherein the barrier layer has a window through which at least one of the second matrix layer and the first backing layer can extend to attach to the other layer;
wherein at least part of the second matrix layer is disposed above the reservoir, as measured from the surface to which the device is applied.
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Abstract
A multilayered drug delivery system with a barrier suitable for delivery of drug through an individual'"'"'s body surface. By placing a barrier between two adjacent layers, unintended drug flow due to migration of a drug matrix between the adjacent matrix layers in the system to a patient is avoided.
44 Citations
12 Claims
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1. A device for administration of a pharmaceutical agent to an individual through a body surface, comprising:
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a. a reservoir having a first matrix comprising at least one pharmaceutical agent in the first matrix, the reservoir having a reservoir outer perimeter; b. a first backing layer attached to the reservoir and substantially impermeable to the pharmaceutical agent, the first backing layer having a first backing layer outer perimeter; c. a second matrix layer permeable to the pharmaceutical agent, the second matrix layer having a second matrix layer outer perimeter; and d. a barrier layer disposed between the reservoir and at least part of the second matrix layer, the barrier layer having a barrier layer outer perimeter that is smaller than the second matrix layer outer perimeter, the reservoir outer perimeter being smaller than the barrier layer outer perimeter, the barrier layer being of a material that is substantially impermeable to the pharmaceutical agent wherein the barrier layer has a window through which at least one of the second matrix layer and the first backing layer can extend to attach to the other layer; wherein at least part of the second matrix layer is disposed above the reservoir, as measured from the surface to which the device is applied. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A device for administration of a pharmaceutical agent to an individual at a therapeutically effective rate through a body surface, comprising:
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a. a reservoir having a first matrix comprising at least one pharmaceutical agent in the first matrix, the reservoir having a reservoir outer perimeter; b. a first backing layer attached to the reservoir and substantially impermeable to the pharmaceutical agent, the first backing layer having a first backing layer outer perimeter; c. a second matrix layer permeable to the pharmaceutical agent, the second matrix layer having a second matrix layer outer perimeter; d. a second backing layer attached to the second matrix layer, the second backing layer having a second backing layer outer perimeter; and e. a barrier layer disposed intermediate to the reservoir and at least part of the second matrix layer, the barrier layer having a barrier layer outer perimeter, the barrier layer being a material that is substantially impermeable to the pharmaceutical agent, and the barrier layer having a window through which at least one of the second matrix layer and the first backing layer can extend to attach to the other; wherein the second backing layer outer perimeter is the same size as the second matrix layer outer perimeter but larger than the barrier layer outer perimeter, and wherein the first backing layer outer perimeter is the same size as the reservoir outer perimeter but smaller than the barrier layer outer perimeter.
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Specification