Flow control equipment
First Claim
1. Equipment for controlling a flow of fluid during inspiration from a source to a utilization means and comprisinga 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, andcircuit 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,
where MV=TV×
Rand for controlling the operation of said valves to provide said prescribed inspiratory fluid flow and deliver said predetermined tidal volume, andsaid circuit means comprisingmeans responsive to said minute volume and inspiration to expiration ratio signals for generating a signal prescribing said fluid flow andmeans responsive to said prescribing signal for operating predetermined ones of said valves to deliver the prescribed fluid flow, andeach of the operated ones of said valves delivering a different magnitude of flow from said source to said utilization means.
1 Assignment
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Accused Products
Abstract
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.
104 Citations
30 Claims
- 1. 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, - space="preserve" listing-type="equation">MV (1+E/I)
where MV=TV×
Rand 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.
- 2. Flow control equipment for automatically regulating the delivery of predetermined tidal volumes of fluid from a source to a utilization means 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, 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, - space="preserve" listing-type="equation">MV (1+E/I)
where MV=TV×
Rand for controlling the operation of said valves to provide said prescribed inspiratory fluid flow and deliver said predetermined tidal volume, a tidal volume compensation circuit cooperating with said valves for altering said inspiratory fluid flow to compensate for deviations from said predetermined tidal volume set by said control means and including means cooperating with said circuit means for providing a first signal indicative of the actual inspiratory fluid flow from said source to said utilization means and means cooperating with said control means and responsive to said minute volume (MV) signal and breath rate (R) signal for providing a second signal indicative of a calculated tidal volume (TV) equal to MV/R, and a comparator means for comparing said first and second signals and for controlling said valves to compensate for deviations between said first and second signals. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
Specification