Transdermal drug applicator and electrodes therefor

• US 4,640,689 A
• Filed: 03/12/1986
• Issued: 02/03/1987
• Est. Priority Date: 08/18/1983
• Status: Expired due to Term

• Current Assignee: Drug Delivery Systems Incorporated
• Original Assignee: Drug Delivery Systems Incorporated
• Inventors: Sibalis, Dan
• Primary Examiner(s): Howell, Kyle L.
• Assistant Examiner(s): SHAY, RANDY CITRIN
• Application Number:
  US06/839,050
• Time in Patent Office: 328 Days
• Field of Search: 128/635, 128/639, 128/640, 128/783, 128/798, 128/799, 604/20, 604/891, 604/892, 604/896, 204/299 R, 204/301
• US Class Current: 604/20
• CPC Class Codes: A61M 37/00 Other apparatus for introducing media into the body for reproduction or fertilisation A61B17/425; apparatus for iontophoresis or cataphoresis A61N1/30; Percutany, i.e. introducing medicines into the body by diffusion through the skin salt baths A61H33/04
• CPC Class Codes: A61N 1/044 Shape of the electrode
• CPC Class Codes: A61N 1/0448 Drug reservoir

Abstract

An improved transdermal drug applicator for application to a living body for the migration of at least one medicament through the skin into the blood stream embodying at least two electrode elements forming the applicator and with the electrodes separated from each other by insulating means. A reservoir means, in at least one of said electrode elements of said applicator, containing said medicament; and a circuit, including a power source, for supplying electric power to said electrodes and such reservoir means. Suitable cover means partially enclosed at least said reservoir means, and adhesive means affixes the applicator to the skin, so as to complete an electrical circuit through the skin when the applicator is affixed thereto, thus creating at least one physico/chemical mass transfer phenomenon which causes said medicament to migrate through the skin.

Claims

1. A transdermal drug applicator for application to a living body for the migration of at least one medicament through the skin into the blood stream comprising:

at least two electrode elements forming said applicator and being separated from each other,

reservoir means, in at least one of said electrode elements of said applicator, for containing said medicament,

at least one of said electrode elements comprise reservoir means separted by a semi-permeable member which forms a drug gradient across said reservoir means,

a circuit means, including a power source, for supplying electric power to said electrodes and said reservoir means,

cover means partially enclosing at least said reservoir means, and

adhesive means for affixing said applicator to said skin, whereby an electrical circuit through the skin is formed when said applicator is affixed to said skin, thereby creating at least one physico/chemical mass transfer phenomena which causes said medicament to migrate through the skin.

2. A transdermal drug applicator according to claim 1, wherein said electrode elements are of different constructions.

3. A transdermal drug applicator according to claim 1, wherein said electrode elements are of different size.

4. A transdermal drug applicator according to claim 1, wherein said electrode elements comprise reservoir means and adjacent conductive elements;

and said circuit being connected to said conductive elements so as to enable said at least one physico/chemical mass transfer phenomena to take place at the surface of the skin.

5. A transdermal drug applicator according to claim 1, including a third electrode in said applicator.

6. A transdermal drug applicator according to claim 5, wherein at least one of said electrodes constitutes an inactive or indifferent electrode.

7. A transdermal drug applicator according to claim 5, wherein all of said electrodes are active electrodes.

8. A transdermal drug applicator according to claim 7, wherein said reservoir means contain a medicament including, both ionic and non-ionic drugs for transdermal delivery delivered by means of said active electrodes.

9. A transdermal drug applicator according to claim 1, wherein said electrodes contain different medicaments.