Device for supplying breathing gas into a closed ventilating circuit of a medical respirator

US4579115A · kind A · utility

Assignee

• DRAGERWERK AKTIEGESELLSCHAFT · DE

Inventors

• Carl F. Wallroth · Lübeck, DE
• Horst Frankenberger · Bad Schwartau, DE
• Anton Obermayer · Erlangen, DE
• Michael Waschmann · Lübeck, DE
• Jorg Bayerlein · Stockelsdorf, DE

Key dates

• Filing date: Jan 14, 1985
• Grant date: Apr 1, 1986
• Expiry date: Jan 14, 2005

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61M16/22
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

With closed respiratory systems, the patient's respiratory tract is tightly connected to a closed volume to which breathing gas is supplied only in the amount taken in by the patient. To this end, the breathing gas supply must be controlled. The controlled variable is either the pressure in the ventilating circuit, or the concentration of oxygen or the anesthetic gas in the breathing gas. A dropping pressure indicates either an increased consumption or a leak. To avoid insufficient or excessive loading of the patient, it is very important to be able to distinguish consumption from a leak. The inventive device makes this distinction possible. The breathing gas amounts are adjusted in the ventilating circuit at preset different pressures and are compared with each other, and the leak portion is computed therefrom.