Multilayered device for controlled topical delivery of therapeutic agents to the skin
First Claim
1. A multi-layered delivery device, which is applied to the surface of skin for delivering one or more therapeutic agents to the skin, comprising:
- a first layer that contacts the skin, a second layer that contacts the first layer and a third layer that contacts the second layer, each layer comprising;
particles of one or more therapeutic agentsparticles of flexible, porous, encapsulated polymer open cell foam material, which material is selected from the group consisting of polyurethane, polyvinylacetate, polyvinylalcohol, polyethylene, and silicone for holding and releasing the therapeutic agent;
a polymer enrobing material selected from the group consisting of silicone, hyrogels ethylene vinyl acetate, and polyurethane elastomers for holding and releasing the encapsulated polymer foam material including the therapeutic agent for delivery to the skin;
wherein the particle size of the one or more therapeutic agents and the particle size of the flexible polymer with the open cell size become incrementally larger as they are situated in layers contacting the skin and then successively placed outwardly away from the skin, so that a smaller particle size of the therapeutic agent is located in a layer closer to the skin, with the next larger particle size located in a layer adjacent to the layer closest to the skin.
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Abstract
A multilayered composite sheet for delivering one or more therapeutic agents to the skin is disclosed. The composite sheet comprises a flexible porous polymer with open cells of a sufficient size for holding a therapeutic agent, an encapsulating agent for encapsulating the flexible porous polymer and therapeutic agent, and an enrobing agent for enrobing the encapsulated flexible porous polymer and therapeutic agent. Additional layers of the flexible porous polymer, therapeutic agent and other materials are added to the first layer which is in contact with the skin. The first layer has particular particle sizes for the flexible porous polymer, open cell size, and therapeutic agent allowing for relatively quick delivery of the therapeutic agent to the skin. Each successive layer placed on top of the first layer has incrementally larger particle sizes of the flexible porous polymer and therapeutic agent providing successively longer delivery times than the first layer.
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Citations
20 Claims
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1. A multi-layered delivery device, which is applied to the surface of skin for delivering one or more therapeutic agents to the skin, comprising:
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a first layer that contacts the skin, a second layer that contacts the first layer and a third layer that contacts the second layer, each layer comprising; particles of one or more therapeutic agents particles of flexible, porous, encapsulated polymer open cell foam material, which material is selected from the group consisting of polyurethane, polyvinylacetate, polyvinylalcohol, polyethylene, and silicone for holding and releasing the therapeutic agent; a polymer enrobing material selected from the group consisting of silicone, hyrogels ethylene vinyl acetate, and polyurethane elastomers for holding and releasing the encapsulated polymer foam material including the therapeutic agent for delivery to the skin; wherein the particle size of the one or more therapeutic agents and the particle size of the flexible polymer with the open cell size become incrementally larger as they are situated in layers contacting the skin and then successively placed outwardly away from the skin, so that a smaller particle size of the therapeutic agent is located in a layer closer to the skin, with the next larger particle size located in a layer adjacent to the layer closest to the skin. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification