Surgery – Respiratory method or device – Means for cooling respiratory gas or respiration device
Patent
1983-06-14
1986-05-06
Bennett, Henry
Surgery
Respiratory method or device
Means for cooling respiratory gas or respiration device
622593, 62514R, A62B 700
Patent
active
045865000
ABSTRACT:
In a breathing apparatus of the closed circuit type wherein breathable air is recirculated with the removal of carbon dioxide and the replenishment of oxygen, the breathable air is cooled by causing it to flow through a conduit in heat exchange relationship with a reservoir containing a liquid refrigerant medium which has a boiling point below the maximum desired temperature of the breathable air supply. The reservoir is vented to allow escape of refrigerant gas through an adjustable pressure relief valve, whereby cooling of the breathable air supply is effected through a progressive boiling away of the refrigerant liquid from the reservoir, the boiling point of the liquid being controlled by means of a corresponding adjustment of the pressure relief valve.
REFERENCES:
patent: 3714942 (1973-02-01), Fischel et al.
patent: 4314566 (1982-02-01), Kiwak
patent: 4370192 (1983-01-01), Cooley
Bennett Henry
Sabre Safety Limited
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