Respirator with oxygen enrichment
AssigneeDragerwerk Aktiengesellschaft
InventorDieter Weismann
Life of this patent
Estimating the term…
Abstract
A respirator with a delivery device, which draws in ambient air via an inlet line and pumps it into an outlet line, with a discharge opening, which branches off from the outlet line and via which a partial flow of the gas being delivered, which can be set with a discharge valve, escapes. Oxygen is added with the smallest possible loss of gas and with good constancy of the concentration by: providing the inlet line with a buffer volume, via which the ambient air drawn in can flow; providing a return line which introduces the partial flow into the buffer volume is present between the discharge opening and the buffer volume; and providing the oxygen source connected to the inlet line and/or to the buffer volume.
Claims15
A respirator, comprising:
- an inlet line;
- an outlet line;
- a delivery means for drawing in breathing gas via said inlet line and for pumping the breathing gas into said outlet line;
- a discharge opening which branches off from said outlet line;
- a discharge valve for setting a partial flow of the gas being delivered through said discharge opening;
- a return line extending from said discharge opening to said outlet line for passage of said partial flow from said discharge opening to said inlet line;
- an oxygen source connected to a circuit formed by said inlet line, said outlet line and said return line, upstream of said discharge opening.
Dependencies are inferred from the claim text.