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Topical drug delivery system

  • US 5,415,866 A
  • Filed: 07/12/1993
  • Issued: 05/16/1995
  • Est. Priority Date: 07/12/1993
  • Status: Expired due to Term
First Claim
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1. A topical anesthetic delivery system, comprising:

  • a. a viscoelastic gel pad, having a liquid fraction, a first surface, an opposing second surface and a periphery;

    b. said liquid fraction of said viscoelastic gel pad being formed of both alcohol and water, wherein the percentage of said alcohol, by volume, ranges between twenty percent and ninety percent;

    said alcohol and water liquid fraction having dissolved therein between ten percent and forty percent, by weight, of lidocaine U.S.P./N.F.;

    c. a first layer of alcohol and water impermeable material covering said first surface of said viscoelastic gel pad; and

    d. a second layer of alcohol and water impermeable material, having an aperture formed therein of less dimension than said second surface of said viscoelastic gel pad;

    said second layer of alcohol and water impermeable material, except for said aperture, covering said second surface of said viscoelastic gel pad;

    said aperture being positioned upon said second surface, and within said periphery, of said viscoelastic gel pad;

    e. said first and second layers of alcohol and water impermeable material being joined to form a seal about the periphery of said viscoelastic gel pad, so as to encapsulate said viscoelastic gel pad except for said aperture;

    f. wherein a portion of said second surface of said viscoelastic gel pad is exposed through said aperture and is held in direct contact with an anesthetic target skin surface when applied to a wearer'"'"'s skin.

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