Method for automatically controlling a ventilation or breathing system as well as a corresponding ventilation or breathing system

US8950399B2 · kind B2 · utility

Assignee

• Dräger Medical GmbH · DE

Inventors

• Thomas HANDZSUJ · Wulfen, DE
• Ernst-Wilhelm Schubert · Lübeck, DE
• Frank Ralfs · Wulfen, DE
• Marcus Eger · Stade, DE

Key dates

• Filing date: Nov 5, 2008
• Grant date: Feb 10, 2015
• Expiry date: Jan 11, 2033

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61M2230/46
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A method is provided for automatically controlling a ventilation or breathing system with a ventilation unit (7), which is controlled by a control unit (5), in order to deliver an assist pressure preset by the control unit, wherein the current values of the tidal volume flow Flow(t) and those of the volume V(t) are detected in the control unit. The control unit (5) may carry out a proportionally assisting ventilation method (PAV: Proportional Assist Ventilation) by a factor for a degree of compensation (PPSp) being selected by the control unit and by the parameters for the volume assist (VA) and the flow assist (FA) being determined by:VA=PPSp·ΔE FA=PPSp·ΔR, wherein ΔE is the deviation of a measured or assumed elastance (Emeasured) of the patient from an ideal elastance (Eideal) and ΔR is the deviation of a measured or assumed resistance (Rmeasured) of the patient from an ideal resistance (Rideal). The assist pressure PS(t)=VA·V(t)+FA·Flow(t) is determined from this by the control unit with the flow delivery device (ventilation unit (7)) being set such as to deliver this assist pressure.