Gas mixing devices for resuscitation/lung ventilation apparatus

Details Gas mixing devices for resuscitation/lung ventilation apparatus Gas mixing devices for resuscitation/lung ventilation apparatus

1995-06-28

1997-02-25

Miller, V.

Surgery

Respiratory method or device

Means for supplying respiratory gas under positive pressure

12820312, 12820325, A61M 1612

Patent

active

056051484

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.

REFERENCES:
patent: 3794072 (1974-02-01), Diedrich et al.
patent: 3913607 (1975-10-01), Price
patent: 4036253 (1977-07-01), Fegan et al.
patent: 4682591 (1987-07-01), Jones
patent: 4848333 (1989-07-01), Waite

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