Gas mixing devices for resuscitation/lung ventilation apparatus
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United States of America Patent
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Feb 25, 1997
Grant Date -
N/A
app pub date -
Jun 28, 1995
filing date -
Jul 5, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A resuscitation/ventilation apparatus incorporates an entrainment mixer with a nozzle, discharging entraining gas into an entrainment chamber, the nozzle being connected with a high pressure source of the entraining gas. One entrainment port to the entrainment chamber is connected to atmosphere and another entrainment port is connected to an oxygen source. A continuously variable restriction is disposed in the oxygen supply conduit upstream of the other entrainment port and is variable independently of any control of the entraining gas supply, to enable delivery of a gas mixture of steplessly variable oxygen concentration.
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