Device and method for the transdermal delivery of cannabidiol
Transdermal delivery devices for the delivery of cannabidiol (CBD) are shown and described. In a reservoir-patch design, a microporous, hydrophilic membrane and a backing define a reservoir that houses a mixture of CBD, a polar liquid, and a gelling agent. The hydrophilic membrane is coated with an amine-compatible silicone skin adhesive. In a monolithic design, a release liner is coated with a mixture of CBD and a PIB or amine-compatible silicone skin adhesive laminated to the backing material. In either design, the CBD may be provided as a pure compound or as a component of a cannabis oil.
1. A device for the transdermal delivery of cannabidiol, comprising:
a backing attached to a hydrophilic, porous membrane to define an enclosed reservoir between the backing and the hydrophilic, porous membrane, wherein the porous membrane has a first side with a skin adhesive and a second side facing the interior of the reservoir, and the skin adhesive is an amine-compatible, silicone adhesive comprising a trimethylsiloxy end-capped reaction product of a silanol endblocked polydimethylsiloxane with a silicate resin;
a preparation comprising a therapeutically effective amount of cannabidiol and an organic polar liquid carrier contained in the reservoir;
a release liner attached to the first side of the hydrophilic porous membrane, wherein the release liner is selectively removable from the first side of the hydrophilic porous membrane to expose the skin adhesive.
2. The device of claim 1 , wherein the organic polar liquid carrier is an alcohol comprising between 2 and 30 carbon atoms per molecule.
3. The device of claim 1 , wherein the organic polar liquid carrier is a carboxylic acid comprising between 2 and 30 carbon atoms per molecule.
4. The device of claim 3 , wherein carboxylic acid is a fatty acid that is at least partially unsaturated.
5. The device of claim 1 , wherein the preparation further comprises a gelling agent.
6. The device of claim 5 , wherein the gelling agent comprises a cellulose derivative.
7. The device of claim 1 , wherein the hydrophilic, porous membrane comprises at least one of polyethylene and poly (ethyl vinyl) alcohol.
8. The device of claim 1 , wherein the hydrophilic, porous membrane has a porosity of at least about 60 percent.
9. The device of claim 1 , wherein the hydrophilic, porous membrane has a mean flow pore size of at least about 0.1 microns and no more than about 1 micron.
10. The device of claim 1 , wherein the polar organic carrier is one selected from oleic acid and oleyl alcohol, and the amount of the polar organic liquid carrier by weight of the total amount of the polar liquid organic carrier and cannabidiol in the preparation is at least about fifty percent.
11. The device of claim 1 , wherein the amount of the skin adhesive per square meter of the porous, hydrophilic membrane is at least about 10 grams.
12. The device of claim 1 , wherein the preparation comprises a liquid carrier and a cannabis oil, and the cannabis oil comprises from about five (5) percent to about fifteen (15) percent by weight of the combined liquid carrier and cannabis oil.
13. The device of claim 12 , wherein the cannabis oil comprises from about 25 percent to about 80 percent cannabidiol by weight of the cannabis oil.
14. A method of transdermally delivering cannabidiol to a person, comprising:
providing the device of claim 1 ;
removing the release liner from the first side of the porous, hydrophilic membrane;
contacting the first side of the porous, hydrophilic membrane with the person's skin; and
maintaining the device in contact with the person's skin for a period of time sufficient to deliver the therapeutically effective amount of cannabidiol to the patient.