Ventilating apparatus

US6009871A · kind A · utility

Assignee

• DRAGERWERK AKTIEGESELLSCHAFT · DE

Inventors

• Siegfried Kiske · Lübeck, DE
• Karsten Hoffmann · Eutin, DE

Key dates

• Filing date: Nov 12, 1997
• Grant date: Jan 4, 2000
• Expiry date: Nov 12, 2017

Classification

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

Abstract

A ventilating apparatus includes a closed breathing loop (3) which is supplied with the gases needed for ventilation via a metering unit (9). The ventilating apparatus is improved in such a manner that the respiratory gas can be metered during the inspiration phase without affecting the respiratory gas stroke volume supplied to the patient. The ventilating apparatus includes a flow-measuring device (14) for detecting a gas volume (V.sub.F) which is metered into the closed breathing loop (3) during the inspiration phase. A subtraction element (16) forms a difference volume (V.sub.T -V.sub.F) between the pump volume (V.sub.T) and the gas volume (V.sub.F). A switch (21) permits utilizing the difference volume (V.sub.T -V.sub.F) as a new adjusting value for the pump volume of the respiratory gas pump unit (2).