Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1996-05-03
1998-08-25
Yu, Mickey
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820418, 12820422, A61M 1600
Patent
active
057973938
ABSTRACT:
The invention is directed to a method for adjusting the respirating pressure during respirating phases in a ventilating apparatus. The method is improved by providing for a volume-controlled ventilation under the conditions of pressure-controlled ventilation as well as allowing for self-respiratory activity. The method includes the steps of: fixing a respirating volume desired value V.sub.TS and an inhalation pressure desired value P.sub.IS ; actuating the inhalation valve during inhalation in a first inhalation stroke to adjust the inhalation pressure P.sub.I to the inhalation pressure desired value P.sub.IS ; comparing the respiratory volume V.sub.T to the respirating volume desired value V.sub.TS and, if the respirating volume V.sub.T is less than the respirating volume desired value V.sub.TS, then, during the next inhalation stroke following the first inhalation stroke, incrementally increasing the inhalation pressure desired value P.sub.IS by a pressure increment .DELTA.P until the respirating volume V.sub.T is greater than or equal to the respirating volume desired value V.sub.TS ; and, during each inhalation, comparing the inhalation pressure P.sub.I to the inhalation pressure desired value P.sub.IS and, if the inhalation pressure P.sub.I increases to a value greater than P.sub.IS because of an intended exhalation, then, opening the exhalation valve to an extent so that the inhalation pressure desired value P.sub.IS is reestablished as the inhalation pressure P.sub.I.
REFERENCES:
patent: 3923056 (1975-12-01), Bingmann et al.
patent: 3961627 (1976-06-01), Ernst et al.
patent: 4957107 (1990-09-01), Sipin
patent: 5582163 (1996-12-01), Bonassa
Dragerwerk Aktiengesellschaft
Ottesen Walter
Srivastava V.
Yu Mickey
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