초록 ▼

An anesthesia ventilator is disclosed for controlling the flow of air and/or oxygen through a plurality of binary weighted valves from a fluid regulator source to a bellows assembly. Directly-set minute volume, breath rate and inspiration to expiration ratio controls operate electronic circuitry whi

An anesthesia ventilator is disclosed for controlling the flow of air and/or oxygen through a plurality of binary weighted valves from a fluid regulator source to a bellows assembly. Directly-set minute volume, breath rate and inspiration to expiration ratio controls operate electronic circuitry which adjusts the magnitude of the flow, the tidal volume and the inhalation to exhalation times. The circuitry includes alarm detecting devices for alerting personnel that a patient should be ventilated manually, that a patient is disconnected from the instrument, that control settings exceed specifications for the instrument, that undesired low gas pressure exists and that actual inspiration to expiration is less than that of the control setting. Flow and tidal volume limiting apparatus is provided, together with sigh circuitry and devices for correcting for altitude and gas parameters.

대표청구항 ▼

Equipment for controlling a flow of fluid during inspiration from a source to a utilization means and comprising a plurality of valves adapted to be connected in a parallel arrangement between said source and said utilization means, each of said valves being individually operable to deliver a prescr

Equipment for controlling a flow of fluid during inspiration from a source to a utilization means and comprising a plurality of valves adapted to be connected in a parallel arrangement between said source and said utilization means, each of said valves being individually operable to deliver a prescribed fluid flow from said source to said utilization means during inspiration, control means including a first control device independently settable for supplying a distinct minute volume (MV) signal, a second control device independently settable for supplying a distinct breath rate (R) signal and a third control device independently settable for supplying an inspiratory (I) time to expiratory (E) time ratio signal, and circuit means for delivering a predetermined tidal volume (TV) of said fluid from said source to said utilization means and being responsive to a receipt of said minute volume (MV), breath rate (R) and inspiratory (I) time to expiratory (E) time ratio signals for electrically combining said signals in accordance with the function, MV (1+E/I) where MV=TV×R and for controlling the operation of said valves to provide said prescribed inspiratory fluid flow and deliver said predetermined tidal volume, and said circuit means comprising means responsive to said minute volume and inspiration to expiration ratio signals for generating a signal prescribing said fluid flow and means responsive to said prescribing signal for operating predetermined ones of said valves to deliver the prescribed fluid flow, and each of the operated ones of said valves delivering a different magnitude of flow from said source to said utilization means.