Active substance-containing patch
First Claim
1. In an active substance-containing patch for the controlled release of an active substance, said patch comprising a backing layer, an adjoining active substance-containing reservoir layer which softens at body temperature, a membrane controlling the active substance release, a pressure-sensitive adhesive device permitting fixation of the patch to the skin, and a removable protective layer, the improvement wherein the reservoir layer which softens at body temperature is spaced away from the controlling membrane by means of a device made of a material impermeable to the active substance which device extends over all the mutually facing surfaces of the reservoir and the membrane and which device has at least one passage for the reservoir layer which softens at body temperature.
1 Assignment
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Accused Products
Abstract
An active substance-containing patch for the controlled release of active substances, comprising a backing layer, an adjoining active substance-containing reservoir layer softening at body temperature, a membrane controlling the active substance release, a pressure-sensitive adhesive device permitting fixation of the patch to the skin, and a removable protective layer, is characterized by the fact that the reservoir layer which softens at body temperature is spaced away from the controlling membrane by means of a device made of a material impermeable to the active substance which extends all over the mutually facing surfaces of the reservoir and the membrane and which has at least one passage for the reservoir layer which softens at body temperature.
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Citations
11 Claims
- 1. In an active substance-containing patch for the controlled release of an active substance, said patch comprising a backing layer, an adjoining active substance-containing reservoir layer which softens at body temperature, a membrane controlling the active substance release, a pressure-sensitive adhesive device permitting fixation of the patch to the skin, and a removable protective layer, the improvement wherein the reservoir layer which softens at body temperature is spaced away from the controlling membrane by means of a device made of a material impermeable to the active substance which device extends over all the mutually facing surfaces of the reservoir and the membrane and which device has at least one passage for the reservoir layer which softens at body temperature.
Specification