Method of maintaining constant arterial PCO 2 and...

Details Method of maintaining constant arterial PCO 2 and... Method of maintaining constant arterial PCO 2 and...

2006-09-05

2006-09-05

Bennett, Henry (Department: 3743)

Surgery

Respiratory method or device

Means for supplying respiratory gas under positive pressure

C128S205240, C128S203120

Reexamination Certificate

active

07100606

ABSTRACT:
A method to maintain isocapnia for a subject. A fresh gas is provided to the subject when the subject breathes at a rate less than or equal to the fresh gas flowing to the subject. The fresh gas flow equal to a baseline minute ventilation minus a dead space gas ventilation of the subject contains a physiological insignificant amount of CO2. An additional reserve gas is provided to the subject when the subject breathes at a rate more than the fresh gas flowing to the subject. The reserve gas has a partial pressure of carbon dioxide equal to an arterial partial pressure of carbon dioxide of the subject. A breathing circuit is applied to the method to maintain isocapnia for a subject. The breathing circuit has an exit port, a non-rebreathing valve, a source of fresh gas, a fresh gas reservoir and a reserve gas supply.

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