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US 4,069,818 AGranted
Fluidic controlled ventilator
AssigneeN.A.D., Inc.
InventorPeter J. Schreiber
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AssigneeN.A.D., Inc.
InventorPeter J. Schreiber
Estimating the term…
A ventilator is disclosed having a power unit for driving the ventilator which includes fluidic timing control means, gas input means and gas output means. The gas input means is connected to the timing control means via pressure regulating means. Display means are provided responsive to the pressure of the gas which is provided to the timing control means. The timing control means is connected to the output means and is alternately conductive and non-conductive of gas from the input means to the output means. The ratio of the periods of conductivity to non-conductivity remain fixed even where the frequency of alternation varies to maintain a fixed ratio of the inspiratory to expiratory phase time.
In a ventilator having an automatic power and timing circuit which is connected by a first fluid path to a patient and a manual power unit which is connected by a second fluid path to said patient, a switching mechanism, said switching mechanism including an elongated slidable rod having a pair of fluid stopping means and walls about said first and second fluid path, a first of said stopping means being engageable with the wall of said first fluid path between said automatic circuit and said patient to stop fluid flow therebetween, the second of said fluid stopping means being engageable with the wall of said second fluid path between said manual unit and said patient to stop fluid flow therebetween, only one of said fluid stopping means being engageable at a time so that movement of said rod to a first position enables fluid flow only between said automatic circuit and said patient while said second stopping means prevents fluid flow between said manual unit and said patient while movement to a second position stops fluid flow between said automatic circuit and said patient while permitting fluid flow between said manual unit and said patient, a first chamber including a wall portion having an opening therein through which said switching mechanism extends and a second chamber including a wall portion having an opening therein through which said switching mechanism extends, said openings in said wall portions of said first and second chambers being connected via a fluid connecting path through which said rod extends, said first and second stopping means being provided on said rod and within said first and second chambers, respectively, and cooperating with each wall portion about said opening to close said opening thereby causing one end or the other of said fluid path to be closed in accordance with the position of said elongated rod so that selection of said automatic or manual ventilation is enabled, said first chamber including a first relief valve and said second chamber including a second relief valve, said fluid path between said first and second chambers being connected via a fluid path to said patient, said first chamber being connected via a fluid path to said automatic unit and said second chamber being connected to said manual unit.
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Pumps therefor: bag or bellow in a bottle
Devices for influencing the respiratory system of patients by gas treatment
Pumps therefor: bellows-type
Devices for delivering substances into the body
Term ended 24 Jan 1995 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
This invention relates generally to ventilators and more particularly to a fluidic power unit for an anesthesia ventilator.
Lung ventilators are well known for use in the artificial ventilation of the lungs. These ventilators, by means of presetting of certain respiratory parameters, inflate and deflate the lungs of a patient connected to the lung ventilator. Among the respiratory parameters which must be preset are the values for tidal volume, respiratory minute volume, respiratory frequency, inspiratory phase time, inspiratory/expiratory phase time ratio, inspiratory flow, inspiratory pressure, and others. Unfortunately, all of these parameters are interrelated and therefore adjustment of one of the parameters normally causes a change of one or more of the other parameters. However, it is normally preferred that changing the presetting of one parameter does not require the readjustment of the settings for other of the parameters. A preferred ventilator control combination would thus consist of controls for respiratory frequency, tidal volume and inspiratory flow, which would have a fixed ratio of inspiratory to expiratory phase time through a range of frequency settings. A display of the respiratory frequencies would also be most advantageous.
Prior systems which have had the capability of changing the frequency while having a fixed ratio of inspiratory to expiratory phase time and a display of the respiratory frequency rate have been unduly expensive. The inexpensive systems have required constant readjustment of other settings in order to maintain a fixed ratio of inspiratory to expiratory phase time where the frequency setting has been changed.
Other objects and many of the attendant advantages of this invention will be readily appreciated as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawing wherein:
FIG. 1 is a schematic block diagram of a fluidic controlled anesthesia ventilator comprised of FIGS. 1A and 1B; and
FIG. 2 is a schematic block diagram of the oscillator used in the timing control unit.
Referring now in greater detail to the various figures of the drawing wherein like reference numerals refer to like parts, a fluidic controlled ventilator is shown generally in FIGS. 1A and 1B.
The ventilator shown in FIG. 1A includes a fluid input line 20 which is connected via an ON/OFF valve 22 to a pressure regulator 24 via line 26 and to pressure regulator 28 via line 30. The output of pressure regulator 24 is connected to a pressure controlled ON/OFF valve 32 via line 34. A pressure gauge 36 is connected to line 34 via line 38. The output of pressure regulator 28 is connected to a timing control unit 40 via line 42. A pressure gauge 44 is connected via line 46 to line 42. The output of timing control unit 40 is connected to the pressure controlled ON/OFF valve 32 via line 48 to control the opening and closing of the valve 32. The output of pressure controlled ON/OFF valve 32 is connected via line 50 to a fluid injector 52. The output of fluid injector 52 is connected via line 54 either to an anesthesia ventilator which includes indirect power transmission or directly to a patient for breathing purposes.
The timing control unit 40 includes a fluidic flip flop 56, a pair of passive timers 58 and 60, and a pair of capacitors 62 and 64, the outputs of which are connected to bleed orifices 66 and 68, respectively.