Method and an apparatus for providing a constant medicine dose for an inhalic application at low inhalic flow

US6681762B1 · kind B1 · utility

Assignee

• GSF FORSCHUNGSZENTRUM FUR UMWELT UND GESUNDHEIT GMBH · DE

Inventors

• Gerhard Scheuch · Kirchberg, DE
• Knut Sommerer · Hersbruck, DE
• Bernhard Mullinger · Gauting, DE
• Friedel Haas · Gauting, DE
• Sascha Roeder · Ingolstadt, DE

Key dates

• Filing date: Mar 16, 2000
• Grant date: Jan 27, 2004
• Expiry date: Mar 16, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/7722
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A device for flow rate limitation at low differential pressures, particularly for limiting the volumetric inhalation flow during inhalation of therapeutic aerosols, consists of a housing 11 including an aspiration orifice 14, an inhalation orifice 15 and a flow passage 23 disposed therebetween. The flow passage has a flat elongate cross-section with flexible large-area walls 18, 20 having a cross-sectional area adapted to be reduced, as a function of the differential pressure prevailing between the inhalation orifice and the aspiration orifice, as well as of the flexibility of the material of the walls, to a size appropriate for a predetermined volumetric maximum inhalation flow.