Title of Invention

"AN ACTIVE SUBSTANCE-CONTAINING PATCH FOR CONTROLLED RELEASE OF ESTRADIOL "

Abstract An active substance-containing patch for controlled release of estradiol The present invention relates to an active substance-containing patch for controlled release of estradiol or its pharmaceutically acceptable derivatives, alone or in combination with gestagens, to the human or animal skin, consisting of a backing layer, an active substance-containing reservoir connected thereto which is suitable for combined active substance release, said reservoir having been made from pressure sensitive adhesive, which contains estradiol or its pharmaceutically acceptable derivatives, or the pressure-sensitive adhesive contains estradiol, or its pharmaceutically acceptable derivatives, in combination with at least one gestagen in a molar ratio of the former to the latter of 1:1 to 1:10; wherein the concentration of said active substances is 1-20%-wt., based on the total weight of the reservoir; and contains wool wax or components thereof in a concentration of 1-30%-wt, based on the total weight of the reservoir; and contains zinc oxide in a concentration of 1-30%-wt, based on the total weight of the reservoir and a detachable protective layer.
Full Text Estradiol-containing patch for transdermal application of hormones
The invention relates to an active substance-containing patch for controlled release of estradiol or its pharmaceutically acceptable derivatives, alone or in combination with gestagens, to the human or animal skin.
Estrogen- and/or gestagen-containing patches are already known. They do, however, have disadvantages in that they either contain ethanol or involve the potential danger of the active substance recrystallizing in the course of time.
From DE-OS 32 05 258 and EP 0 285 563 it is known to simultaneously administer estradiol and ethanol in a patch formulation. The production of this patch is, however, very complicated, and the patches have little wearing comfort after they have been applied, since they lack flexibility.
EP 0 285 563 describes a transdermal therapeutic system for the combined application of estrogens and gestagens. The reservoir contains the active substance formulation and optionally a membrane, as well as ethanol as percutaneous, absorption-enhancing agent. Since the release of active substance is mainly controlled by the membrane, this transdermal therapeutic system is fundamentally different from the active substance patch according to the present invention. In the patch described by this document, the adhesive merely has the function of fixing the patch on the skin. The fact that it is capable of contributing to the control of the active substance release does not constitute its main task, but is merely a - possibly even unwanted -side effect. The patch is a so-called "pouch patch", since the active substance formulation is present within a pouch.
consisting of an impermeable backing layer and a membrane with adhesive layer. As a consequence of its complicated structure, the production of this patch requires great expenditure since the individual components must be prepared separately and then, in a further process step, combined to form a patch.
EP 0 275 716 describes a transdermal two-layer system - in contrast to the mono-layer system of the present invention -for simultaneous administration of one or more estrogens, which are dissolved or microdispersed in the polymer layer. Here, the pressure-sensitive layer contains, apart from the active compounds, substances which enhance transdermal absorption. Polymer and pressure-sensitive layers may consist of polyacrylates, silicones or polyisobutylenes.
EP 0 328 806 describes a membrane-free transdermal thera-peutic system the matrix of which consists of a polyacrylate adhesive, a solvent, a penetration enhancer and estrogens, its derivatives and combinations thereof.
WO 87/07138 describes an estradiol patch comprising a backing layer, a matrix containing the active substance, and a pressure-sensitive adhesive, which adhesive is covered by a removable protective layer. The production of the matrix and pressure-sensitive adhesive is carried out in process steps requiring a great expenditure in terms of the technology to be applied, by homogenizing, degasifying, coating, drying and separating into individual pieces. In one embodiment, the backing layer must even be coated with a pressure-sensitive adhesive, which means a further process step. The combining of the individual parts takes place in a separate process step. The overall production of the patch thus involves great expenditure and is complicated.
From US 4 624 665, systems are known which contain the active substance in microencapsuled form in the reservoir. The reservoir is embedded between a backing layer and a membrane. The outer margin of the system is provided with a pressure-sensitive adhesive. The structure and production of this system is very complicated since the active substance must be microencapsulated and distributed in a homogenous phase, which then, in further process steps, must be embedded between backing layer and membrane. Xn addition, the system must then be provided with an adhesive margin and covered with a protective layer.
Further, from EP 0 186 019 active substance patches are known wherein to a rubber/adhesive resin mass are added water-swellable polymers, and from which patches estradiol can be released. It has, however, emerged that the release of estradiol from these active substance patches is too low by far and does not meet therapeutic requirements.
In DE-OS 20 06 969 a patch or an adhesive bandage is described which has systemic action and wherein contraceptive substances are incorporated in the adhesive component or the adhesive film. The adhesive film may be an acrylate.
It is thus the object of the present invention to avoid the above-mentioned disadvantages and to provide a stable, i.e. recrystallization-free, estrogen- and/or gestagen-containing patch having sufficient active substance release, whose release is not subject to change by storage.
Surprisingly, it has emerged that this object is achieved by an estrogen- and/or gestagen-containing pressure-sensitive adhesive which contains wool wax or constituents thereof and zinc oxide.
The above-described object is thus achieved by an active substance-containing patch according to the main claim. The subclaims relate to especially preferred embodiments of the subject matter of the invention.
Wool wax is known as a pharmaceutical raw material and is described as such by the pharmacopoeias. It is used because of its liberating capacity for active substances, its being well tolerated by the skin and its absorption capacity for water.
Zinc oxide is also described in the pharmacopoeias. Zinc oxide acts as a mild disinfectant and is antiphlogistic, furthermore it reacts faintly alkaline.
The active substance patch according to the invention can be used for cosmetic as well as therapeutic purposes in human and veterinary medicine.
The recrystallization-free estrogen- and/or gestagen-containing patch having sufficient active substance release contains in its reservoir estradiol and its pharmaceutically acceptable derivatives, alone or in combination with gestagens, in a concentration of a total of 1 - 20%-wt., relative to the totality of the reservoir components, in fact in a molar ratio of 1:1 to 1:10.
The estradiol-containing reservoir may contain at least one component belonging to the group comprising age-protecting agents, plasticizers, antioxidants and absorption enhancers. Suitable plasticizers are known to those skilled in the art, and are described, for example, in DE 37 43 946. The estradiol-containing reservoir usually contains plasticizers in a portion of up to 5%-wt.
Furthermore, the reservoir contains age-protecting agents in a concentration of up to 1%-wt. These are known to those skilled in the art and are described, for example, in DE 37 43 946.
The materials for the impermeable backing layer and the detachable protective layer are also known to those skilled in the art.
The estradiol-containing reservoir may be made from the solution, dispersion and from the melt.
In case the reservoir has no sufficient inherent tack on the skin, it can be provided with an additional active substance-free pressure-sensitive adhesive or with a circumferential pressure-sensitive adhesive margin. In this way it is ensured that the transdermal patch adheres on the skin over the entire period of application.
A particularly preferred structure of the transdermal estradiol-containing patch is a matrix system, wherein, as is known, the matrix takes over the control of the active substance release and is subject to the t-law according to Higuchi. This does not mean, however, that a membrane system is not of advantage in special cases. In membrane systems, an active substance release-controlling membrane is located between reservoir and pressure-sensitive adhesive layer.
The thickness of the transdermal patch is dependent on the therapeutic requirements and can be adjusted accordingly. Usually, it ranges from 0.03 - 0.6 mm.
In the following, the invention will be illustrated by way of embodiment examples.
EXAMPLE 1:
97.86 g of Durotak 387-2287 solution (50.2 g of solid
matter) 4.0 g of wool wax
21.56 g of ethanol and
10.78 g of acetic acid ethyl ester
are homogenized by stirring at room temperature for 2 to 3 hours. Subsequently, 2.0 g of estradiol hemihydrate and 7.0 g norethindrone acetate are added and this is stirred
for about 1 hour. Therafter,
16.8 g of zinc oxide are added and this is stirred for a further 30 min.
The resultant active substance-containing adhesive mass is coated on the detachable protective layer (Hostaphan RN 100, coated on one side with silicone - by Hoechst Diafoil) such that an active substance-containing reservoir having a weight per unit area of approximately 80 g/m2 results. On this reservoir is laminated the impermeable backing layer (polyester film, 19 urn-thick). Subsequently, active substance patches of 16 cm2 are punched out.
EXAMPLES 2 and 3:
The preparation is carried out as in Example 1, but with the raw material quantities as stipulated in Table 1 (preparation formula).
For measuring the human skin penetration, the skin is clamped into the Franz cell. An estrogen- and/or gestagen-containing patch having a surface of 1.539 cm2 is stuck on this skin and the active substance release is measured at 37 °C (acceptor
medium: 0.9% sodium chloride solution + 0.1% NaN3) .
The examination on recrystallization phenomena is carried through in counterlight.
The results are listed in Table 2.
TABLE 1: Composition (Amounts in g)

(Table Removed)
TABLE 2: Analysis results

(Table Removed)
Es: Estradiol hemihydrate NeA: Norethindrone acetate
As is shown by the Table, with the patch according to the invention one obtains a clearly improved penetration through the human skin as compared to the comparison product. At the same time it can be ascertained that in the examples according to the invention no recrystallization occurs whatsoever.



We claim:
1. An active substance-containing patch for controlled release of estradiol or
its pharmaceutically acceptable derivatives, alone or in combination with
gestagens, to the human or animal skin, consisting of
a) a backing layer
b) an active substance-containing reservoir connected thereto which is
suitable for combined active substance release, said reservoir having been
made from pressure sensitive adhesive, which contains estradiol or its
pharmaceutically acceptable derivatives, or the pressure-sensitive adhesive
contains estradiol, or its pharmaceutically acceptable derivatives, in
combination with at least one gestagen in a molar ratio of the former to the
latter of 1:1 to 1:10; wherein the concentration of said active substances is
1-20%-wt., based on the total weight of the reservoir; and contains wool wax
or components thereof in a concentration of 1-30%-wt, based on the total
weight of the reservoir; and contains zinc oxide in a concentration of 1 -30%-
wt, based on the total weight of the reservoir and
c) a detachable protective layer.
2. Active substance-containing patch as claimed in claim 1, wherein
the reservoir contains estradiol or its pharmaceutically acceptable
derivatives, alone or in combination with gestagens, in a portion of
1.5-15%-wt.
3. Active substance-containing patch as claimed in claim 1, wherein
the pressure sensitive adhesive further contains tackifying resins in
a concentration of 1- 50%-wt.
4. Active substance-containing patch as claimed in claim 1 to 3 the reservoir further contains at least one component belonging to the group of age-protecting agents, plasticizers, antioxidants and absorption enhancers.

5. Active substance-containing patch as claimed in claim 1 to 4, wherein the pressure-sensitive adhesive is a pressure-sensitive solution adhesive.
6. Active substance-containing patch as claimed in claim 1 to 5, wherein the backing layer is impermeable to the components of the reservoir.
7. Active substance-containing patch as claimed in claim 1 to 6, wherein an active substance release-controlling membrane is provided between the reservoir and the pressure-sensitive adhesive layer.

8. Active substance-containing patch as claimed in claim 1 to 7, wherein the reservoir is provided with a circumferential, pressure-sensitive adhesive margin.
9. Active substance-containing patch as claimed in claim 1 to 8 , wherein the thickness of the active substance-containing patch is in the range of 0.03-0.6 mm.
10. Active substance-containing patch substantially as herein
described with reference to the foregoing description and the accompanying examples.


Documents:

abstract.jpg

IN-PCT-2001-00041-DEL-Abstract-(06-01-2009).pdf

IN-PCT-2001-00041-DEL-Claims-(06-01-2009).pdf

IN-PCT-2001-00041-DEL-Form-1-(06-01-2009).pdf

IN-PCT-2001-00041-DEL-Form-2-(06-01-2009).pdf

IN-PCT-2001-0041-DEL-Abstract-(21-04-2008).pdf

IN-PCT-2001-0041-DEL-Assignment-(21-04-2008).pdf

IN-PCT-2001-0041-DEL-Claims-(21-04-2008).pdf

IN-PCT-2001-0041-DEL-Correspondence-Others-(21-04-2008).pdf

in-pct-2001-41-del-abstract.pdf

in-pct-2001-41-del-claims.pdf

in-pct-2001-41-del-correpondence-others.pdf

in-pct-2001-41-del-correpondence-po.pdf

in-pct-2001-41-del-description (complete)-21-04-2008.pdf

in-pct-2001-41-del-description (complete).pdf

in-pct-2001-41-del-form-1.pdf

in-pct-2001-41-del-form-19.pdf

in-pct-2001-41-del-form-2.pdf

in-pct-2001-41-del-form-3.pdf

in-pct-2001-41-del-form-5.pdf

in-pct-2001-41-del-gpa.pdf

in-pct-2001-41-del-pct-210.pdf

in-pct-2001-41-del-pct-306.pdf

in-pct-2001-41-del-petition-others.pdf


Patent Number 228663
Indian Patent Application Number IN/PCT/2001/00041/DEL
PG Journal Number 08/2009
Publication Date 20-Feb-2009
Grant Date 05-Feb-2009
Date of Filing 19-Jan-2001
Name of Patentee LTS Lohmann Therapie-Systeme AG
Applicant Address LOHMANNSTRASSE 2,D-56626 ANDERNACH, GERMANY.
Inventors:
# Inventor's Name Inventor's Address
1 MECONI, REINHILD ALEMANNENSTRASSE 42, D-56567 NEUWIED GERMANY
2 KRISTGEN ELVIRA RECKSTRASSE 36,D-56564 NEUWIED GERMANY.
PCT International Classification Number A61K9/70
PCT International Application Number PCT/EP99/05085
PCT International Filing date 1999-07-16
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 198 34 007.9 1998-07-29 Germany