Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1978-11-16
1980-12-30
Howell, Kyle L.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820421, A61M 1600
Patent
active
042417325
ABSTRACT:
An arrangement is provided in a respirator for measuring the amount of gas passed to a patient through a supply line. The arrangement includes a self-oscillating fluidistor for dividing the gas flow into part volumes of a given magnitude and for generating an electrical pulse for each part volume passing therethrough. The fluidistor includes two outputs and a control channel having a temperature-dependent resistor located therein and an amplifier and pulse-forming circuit connected to the resistor so as to generate electrical pulses whose number is related to the number of part volumes flowing through the control channel of the fluidistor. A binary counter is connected to the amplifier and pulse-forming circuit for counting the number of pulses over a predetermined time interval while a digital-to-analog (D/A) converter, having first and second inputs, generates an analog signal corresponding to the number of pulses produced per time interval. A pressure sensing device connected in the supply line to the patient and to one input of the D/A coverter in series with a calibrating resistance such that an electrical control voltage is produced by the pressure sensing device in response to the pressure in the supply line and is supplied to the corresponding input of the D/A converter so as to correct the output signal of the D/A converter in accordance with part volumes of a given predetermined pressure, e.g., atmospheric pressure.
REFERENCES:
patent: 3741208 (1973-06-01), Jonsson et al.
patent: 3768468 (1973-10-01), Cox
patent: 3848591 (1974-11-01), Smythe et al.
patent: 4011866 (1977-03-01), Klein et al.
patent: 4057059 (1977-11-01), Reid, Jr. et al.
patent: 4127123 (1978-11-01), Bird
AGA Aktiebolag
Howell Kyle L.
Tayon Jeffrey W.
LandOfFree
Arrangement in respirators using a fluidistor to determine volum does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Arrangement in respirators using a fluidistor to determine volum, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Arrangement in respirators using a fluidistor to determine volum will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2450