Patent ID: 11872284
Assignee: QPHARMA AB
Field: Pharmaceuticals (Chemistry)
Classification: CPC A | IPC A

Claim 20:
21. An intrauterine device comprising at least one first pharmaceutically active ingredient and at least one first layer made of at least a first polymeric material having dispersed therein between 10 and 60 v/v % of at least one particulate material that obstructs the diffusion of the pharmaceutically active ingredient being released and provides a zero order release of the active ingredient, wherein the particulate material comprises three dimensional shapes that are inert and have mean particle sizes of between 3.6 μm and 100 μm, and the particulate material forms a geometric structure of the shapes with spaces therebetween, wherein molecules of the at least one active ingredient are contained within the spaces of the geometric structure between the shapes of particulate material, and wherein said particles have a thickness, height, and width which are above 0.1 μm in any of the three dimensions.