United States Patent iw]
[li] Patent Number:  Date of Patent:
 PULSATING TRANSDERMAL DRUG DELIVERY SYSTEM
 Inventor: Dan Sibalis, Stony Brook, N.Y.
 Assignee: Drug Delivery Systems Inc., New York, N.Y.
 Appl. No.: 436,118
 Filed: Nov. 13, 1989
Related U.S. Application Data
 Division of Ser. No. 163,941, Mar. 3, 1988, abandoned, which is a continuation of Ser. No. 55,518, May 28, 1987, abandoned.
 Int. a.5 A61M 37/00
 U.S. CI 604/20; 128/783
 Field of Search 604/20; 128/783, 798,
128/803; 424/449, 9; 514/277, 176
 References Cited
U.S. PATENT DOCUMENTS
4,540,564 9/1985 Bodor 424/9
4,689,039 8/1987 Masaki 604/20
4,698,062 10/1987 Gale et al 424/449
4,704,282 11/1987 Campbell et al 424/449
4,764,164 8/1988 Sasaki 604/20
4,820,263 4/1989 Spevak et al 604/20
FOREIGN PATENT DOCUMENTS
0060452 9/1982 European Pat. Off. 604/20
0145493 6/1985 European Pat. Off. 514/176
Primary Examiner—William H. Grieb
Attorney, Agent, or Firm—Lackenbach, Siegel, Marzullo, & Aronson
An electrophoretic/electro-osmotic transdermal drug delivery system for passing at least one drug, or thereapeutic compound, through the skin membrane of a patient by way of a drug reservoir or gel for delivery to the systemic blood of a patient in selected, periodic pulsations. The system can be varied to accommodate various types of therapeutic compounds having varied characteristics and purposes. The system includes a current oscillator that applies periodic electrical variations to the system in order to trigger rhythmical variations of the potential and resistance of the skin membrane so as to cause oscillatory electro-osmotic streaming of the liquid with the therapeutic compound across the skin membrane in synchronization with the oscillator to the systemic blood of the patient in response to the rhythmical variations. The oscillator causes the power source to deliver a periodic pulsating current that alternates with periods of no current in the system or that alternates with periods of a different current. The pulsating current is of greater value than the different current. The pulsating current is applied for relatively short periods relative the periods of non-current or the periods of different current. The different current can be either positive or negative current. During periods of negative current the liquid with the therapeutic compound can tend to be drawn from the skin membrane into the drug reservoir or gel.
4 Claims, 3 Drawing Sheets