US 4,818,540 AGrant
Transdermal Fertility Control System and Process
Issue Date:1989-04-04
•30 Claims
•4 Drawing Sheets
Abstract
Transdermal fertility-controlling absorption polymer matrix dosage units have been developed which comprise a backing layer, an adjoining layer of a solid polymer matrix in which minimum effective daily doses of an estrogen and a progestin are microdispersed and released for transdermal absorption. Presently preferred is use of the natural estrogen, 17-beta-estradiol, and of the progestin, levonorgestrel. The units have a biologically acceptable adhesive polymer layer. The polymer matrix as well as the adhesive layer can have dispersed one or more skin permeation enhancers. Dosage units are provided which transdermally deliver at least minimum daily doses of the estrogen and progestin for multiple days, such as for one week. The invention also provides a process of fertility control using the novel polymer matrix dosage units for the first three weeks of consecutive menstrual cycles of the subject desiring fertility control.
Metadata
Assignee
- Rutgers, The State University of New Jersey
Inventors
- Yie W. Chien
- Te-Yen Chien
- Yih-Chain Huang
Application Information
Application Number:US 9024409
Filing Date:1986-08-29
Priority Date:1985-02-25
Art Unit:158
Classifications
IPC:
A61F 1300
Field of Search:
424448;449
Patent Drawings (4 sheets)
Description
The following examples are in illustration of the invention and are not intended to be limiting.
Example 1
The following ingredients are used in making the hormone-containing polymer matrix discs: 17-beta-estradiol, 1 part; levonorgestrel, 2.5 parts; DC-360 polysiloxane medical fluid (20 cps), 12.4 parts; silicone (medical-grade) 382 elastomer (Silasti.RTM. 382 elastomer, Dow Corning Corporation), 74.1 parts; 10 parts of 40 percent (V/V) PEG 400/water (W/W); catalyst M, 20 drops per 100 g. of the mixture.
The 17-beta-estradiol and levonorgestrel are thoroughly mixed in the PEG 400/water solution by using a high torque mixer (sold by Cole-Parmer Company) at about 1000 RPM, to form a mixture of paste-like consistency.
The hormone mixture is added to silicone (medical-grade) 382 elastomer and mixed well, using the high-torque mixer, to form a homogeneous hormone (PEG) polymer dispersion. The DC-360 polysiloxane medical fluid is added using the high torque mixer to the hormone-polymer mixture and 20 drops (for every 100 g of the mixture) of a cross-linking agent, which is designated as catalyst M and is stannous octanoate, are added to the hormone-microdispersed elastomer mixture. After each addition, the material is thoroughly mixed, and the dispersed mixture is placed under vacuum at 20 psi to remove entrapped air.
The hormone-polydimethylsil oxane dispersion is placed into a device maker and spread on a sheet of backing. A sheet of release liner is placed over the spread out mixture The mixture is then cross-linked, using a pressure of 1000 psi at an elevated temperature (60.degree. C.) for 30 minutes to form a cross-linked, medicated polymer sheet, which has a thickness of 0.2-3 mm.
The medicated polymer sheet is removed from the device maker and is cut into square discs having rounded corners of about 10 sq. cm. The discs are attached to a backing layer of heat sealable polyester film laminated to aluminum foil, which is sold by 3M Company as Scotchpak 1005 or 1006. The medicated discs are attached using an adhesive polymer solution, which is a silicone adhesive polymer sold by Dow Corning as DC-355.
The silicone adhesive is believed to have the following structure: ##STR4##
The skin permeation enhancer-adhesive film is made as by using the following ingredients: skin permeation enhancer, 6.5 parts; acetone 30 parts; and adhesive polymer solution, 100 parts. The skin permeation enhancer-adhesive layer is made by dissolving the 6.5 parts by weight of a skin permeation enhancer in 30 parts of acetone. The acetone solution then is added to 100 parts of a silicone adhesive solution sold by Dow-Corning under the designation DC-355.
The mixture is thoroughly mixed to form a homogeneous mixture of skin permeation enhancer and adhesive polymer, which is applied to a strip of a release liner which is a siliconized, or a Teflon-coated polyester film to permit easy removal of the release liner just prior to application of the final polymer matrix disc dosage unit to the subject to be transdermally treated. The adhesive mixture is applied at a controlled thickness. The formed layer has a thickness of about 50-200 microns. The layer is dried completely in vacuum to remove volatile matter.
The skin permeation enhancer-adhesive polymer layer with release liner is applied onto the hormone-containing polymer matrix disc with the attached backing layer under a constant pressure to provide a firmly adhered strip of a four-layered structure as follows:
1. Backing layer
2 Estradiol and levonorgestrel-containing polymer matrix layer
3. Skin permeation enhancer-adhesive layer
4. Release film layer which can be readily removed to permit application to the skin of the subject to receive transdermally the estradiol and levonorgestrel.
By use of an appropriate cutter, the strip is cut to provide the transdermal anti-fertility hormone polymer matrix dosage units which are square (with rounded corners) in shape and have an area of about 10 sq. cm.
The above polymer matrix disc dosage units can also be made to contain straight-chain saturated fatty acids (with alkyl chain length of C.sub.4 to C.sub.18), decyl methyl sulfoxide (DeMSO) or isopropyl myristate (IPM) or other skin permeation enhancers in the polymer matrix and/or in the adhesive layer.
The transdermal absorption of the hormones from the anti-fertility polymer matrix dosage units of this invention is evaluated by using a skin specimen from a "hairless" mouse or human cadaver by following the procedure described by P. R. Keshary and Y. W. Chien, in Drug Develop. & Ind. Pharm., 10 (6) 883-913 (1984).
Transdermal polymer matrix dosage units (MD Patches) are obtained and evaluated as shown in the following Tables and FIGS. 1-4.
Claims
What is claimed is:
1. A transdermal fertility-controlling polymer matrix dosage unit comprising: (a) a backing layer which is substantially impervious to the fertility-controlling estrogen and progestin hormones to be delivered transdermally; (b) a polymer matrix disc layer which is adhered to said backing layer and which has microdispersed therein effective dosage amounts of fertility-controlling estrogen and progestin hormones said estrogen being selected from the group consisting of 17-beta estradiol, ethinyl estradiol and biocompatible derivatives thereof convertible to said estradiols, progestin being selected from the group consisting of levonorgestrel and norethindrone, said polymer being bioacceptable and permitting said hormones to be transmitted for transdermal absorption, said hormones being stable in said polymer matrix and being transdermally absorbed simultaneously to provide at least minimum effective daily doses of said hormones to effect fertility control; and (c) an adhesive means for securing the dosage unit for transdermal absorption to the subject treated.
2. A transdermal fertility-controlling polymer matrix dosage unit of claim 1 wherein said polymer matrix layer has dispersed therein an effective amount of one or more skin permeation enhancing agents.
3. A transdermal fertility-controlling dosage unit of claim 1 wherein the polymer matrix is a silicone polymer or copolymer.
4. A transdermal fertility-controlling polymer matrix dosage unit of claim 3 wherein the silicone polymer or copolymer is a methyl silicone polymer or copolymer or a methylvinyl silicone polymer or copolymer.
5. A. transdermal fertility-controlling polymer matrix dosage unit of claim 1 wherein the polymer matrix disc layer is a crosslinked polysiloxane polymer of the following formula: ##STR5## wherein R is selected from the group consisting of alkyl or alkoxy having 1-7 carbon atoms, vinyl, phenyl or a combination thereof; and wherein n is about 100 to about 5,000.
6. A transdermal fertility-controlling polymer matrix dosage unit of claim 3 wherein the matrix is made up of microdispersed compartments having a cross-sectional dimension of from about 10 to about 200 microns.
7. A transdermal fertility-controlling polymer matrix dosage unit of claim 1 wherein the estrogen hormone is 17-beta-estradiol.
8. A transdermal fertility-controlling polymer matrix dosage unit of claim 1 wherein the progestin is levonorgestrel.
9. A transdermal fertility-controlling polymer matrix dosage unit of claim 1 wherein the estrogen is 17-beta-estradiol and the progestin is levonorgestrel.
10. A transdermal fertility-controlling polymer matrix dosage unit of claim 1 wherein an effective progestin dosage of at least about 20 mcg per day is transdermally delivered for at least for a term of more than one day to about one week and an effective dose of estrogen of at least 20 is transdermally delivered for at least for a term of more than one day to about one week.
11. A transdermal fertility-controlling polymer matrix dosage unit of claim 10 wherein the progestin is levonorgestrel and the estrogen is 17beta-estradiol.
12. A transdermal fertility-controlling polymer matrix dosage unit of claim 6 wherein the progestin is levonorgestrel and the estrogen is 17-beta-estradiol.
13. A transdermal fertility-controlling polymer matrix dosage unit of claim 1 wherein the progestin is norethindrone and the estrogen is ethinyl estradiol.
14. A transdermal fertility-controlling polymer matrix dosage unit of claim 12 wherein the silicone polymer is a cross-linked siloxane polymer levonorgestrel is transdermally delivered at a dosage of at least about 20 mcg per day for at least for a term of more than one day to about one week and 17-beta-estradiol is transdermally delivered at a dosage of at least about 20 mcg per day for at least for a term of more than one day to about one week, the microdispersed compartment having present aqueous polyethylene glycol dispersing agent and the matrix layer having present an enhancing amount of a skin permeation enhancing agent.
15. A transdermal fertility-controlling polymer matrix dosoage unit of claim 12 wherein the silicone polymer is a cross-linked siloxane polymer norethindrone, is transdermally delivered at an effective dose for at least for a term of more than one day to about one week and ethinyl estradiol is transdermally delivered at an effective dialy dose for at least for a term of more than one day to about one week, the microdispersed compartment having present aqueous polyethylene glycol dispersing agent and the matrix layer having present an enhancing amount of a skin permeation enhancing agent.
16. A transdermal fertility-controlling polymer matrix dosage unit of claim 13 wherein the daily dose amounts are transdermally delivered for at least one week.
17. A transdermal fertility-controlling polymer matrix dosage unit of claim 14 wherein the cross-linked silicone polymer is polydimethylsiloxane.
18. A transdermal fertility-controlling polymer matrix dosage unit of claim 4 wherein the cross-linked silicone polymer is a cross-linked methylvinyl silicone polymer.
19. A transdermal fertility-controlling polymer matrix dosage unit of claim 5 wherein the skin permeation enhancing agent is present in the matrix layer, the adhesive layer or both layers and is selected from isopropyl myristate, straight chain fatty acids having an alkyl groups having 4 to 18 carbon atoms or decyl methyl sulfoxide.
20. A transdermal fertility dosage unit of claim 16 wherein the skin permeation enhancing agent is present in the matrix layer, the adhesive layer or both layers and is selected from isopropyl myristate, straight chain fatty acids having an alkyl groups having 4 to 18 carbon atoms or decyl methyl sulfoxide.
21. A process of controlling fertility by applying to the skin of a subject desiring said treatment a dosage unit as described in claim 1 to provide at least the minimum effective dose amounts of progestin and estrogen for about the first three weeks of a menstrual cycle for successive menstrual cycles for a peroid extending as long as fertility control is desired.