Arrangement for adding liquid anesthetic to the respiratory gas supplied to a patient

US4611590A · kind A · utility

Assignee

• DRAGERWERK AKTIEGESELLSCHAFT · DE

Inventors

• Martin Ryschka · Stockelsdorf, DE
• Wolfgang Falb · Krummesse, DE
• Peter Buttner · Stockelsdorf, DE
• Carl F. Wallroth · Lübeck, DE

Key dates

• Filing date: Nov 28, 1984
• Grant date: Sep 16, 1986
• Expiry date: Nov 28, 2004

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61M2205/3653
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

The invention is directed to an arrangement for adding liquid anesthetic medium to the respiratory gas to be directed to a patient and is applicable to a closed respiratory system wherein an adequate quantity of the anesthetic medium must be supplied in a small respiratory gas volume and is also applicable to an open system wherein large quantities of anesthetic medium are required. The arrangement of the invention includes a plurality of tanks containing anesthetic mediums and a selection switch which can be selectively switched to any one of the tanks. A pump is located after the selection switch and a change-over switch permits switching the anesthetic medium from the pump to an anesthetic medium vaporizer and a swirl chamber. The anesthetic medium is vaporized in the vaporizer and then conducted at high concentration into the respiratory gas directed to the patient. The gas can be guided in a closed system. In the swirl chamber, the anesthetic medium is vaporized into the fresh gas flow which then is conducted to the patient in the form of respiratory gas. A control arrangement monitors and, with data from corresponding measuring devices, controls the preselected sequences.