Patent ID: 8221785

Claim:
A transdermal contraceptive delivery system comprising a backing layer and an adhesive polymer matrix affixed to the backing layer, wherein the adhesive polymer matrix comprises: (a) an adhesive polymer comprising a polyacrylate copolymer; (b) a humectant comprising polyvinylpyrrolidone; (c) a combination of skin permeation enhancing agents consisting essentially of, on a final percentage by weight of the adhesive polymer matrix after fabrication of the system, from about 4% to about 12% dimethyl sulfoxide; from about 4.2% to about 12.6% a fatty (C 8 -C 20 ) alcohol ester of lactic acid; from about 0.7% to about 2.3% lower (C 1 -C 4 ) alkyl ester of lactic acid; and from about 3% to about 9% capric acid; (d) levonorgestrel; and (e) ethinyl estradiol or 17 beta-estradiol.