Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Reexamination Certificate
2008-12-01
2011-11-29
Thanh, Loan (Department: 3764)
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
C128S204180, C128S204210, C128S204220, C128S204260, C128S205230, C128S205240
Reexamination Certificate
active
08066003
ABSTRACT:
The present invention discloses a method for improving control and detection precision of tidal volume by introducing R value, comprising the steps of: a plateau pressure Pplate is used to calculate a system compliance C with C=ΔV/(Pplate−PEEP); VT, the tidal volume obtained currently at patient terminal, is calculated with VT=ΔV×(C−Ctube)/C, wherein ΔV is the variation of tidal volume, PEEP is the positive end expiratory pressure and Ctube is the compliance C of the line. Depending on the calculated VT, the tidal volume which is actually obtained by the patients during this period, the processing unit calculates the tidal volume VT′, which the airway is intended to reach during the next expiration period, by VT′=VT+ΔVT×K wherein K is a scaling factor for control and adjustment, VTis the tidal volume obtained by the patient during the current period, VTset is the presetted tidal volume, ΔVT=VTset−VT. And the processing unit accordingly controls the opening position of the inspiratory valve during the next inspiration period, so as to achieve the purpose of improving control and detection of precision tidal volume.
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Chang Fei
Cong Yumeng
Wang Wei
Beijing Aeonmed Co., Ltd.
Ginsberg Oren
Parmelee Christopher L.
Thanh Loan
Walker & Jocke
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