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Multilayered device for controlled topical delivery of therapeutic agents to the skin

  • US 10,016,584 B1
  • Filed: 12/15/2015
  • Issued: 07/10/2018
  • Est. Priority Date: 01/02/2004
  • Status: Active Grant
First Claim
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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:

  • 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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