SU1690681A1 - Device for forming of pulses of respiratory movements - Google Patents

Abstract

The invention relates to medical technology. A device comprising an ultrasonic receiver 1 and a transmitter 11, the latter being connected to an oscillator, as well as an amplifier 2, a trigger 3, a phase comparison circuit 4, a filter 7, a coincidence circuit 5, a demodulator 12, is characterized in that a detector 6 is introduced into it and a series-connected constant-voltage source 9 and an adder 8, while receiver 1, amplifier 2, trigger 3, phase comparison circuit 4, filter 7. adder 8, oscillator 10 and transmitter 11 are connected in series In the device carrying the frequency of the transmitter 11 consistent with the parameter E breathing gas is generated and a signal proportional to, for example, tidal volume. In addition, the operating range of the oscillator 10 is determined taking into account the variation of the parameters of the vibrator and thereby reduces the measurement error, 1 sludge. (Ls

Description

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The invention relates to medical technology and can be used to generate pulses of respiratory movements, to measure tidal volume under practical conditions of artificial respiration during anesthesia and therapeutic respiration. The closest to the proposed technical entity is a device comprising ultrasonic receivers and a transmitter, an oscillator, an amplifier, a trigger, a phase comparison circuit, a filter, a coincidence circuit, a demodulator.

However, the known device is not sensitive enough and accurate due to the lack of automatic adjustment.

The purpose of the invention is to increase the sensitivity of the device and measurement accuracy

The drawing shows an electrical block diagram of the device.

The device contains an ultrasonic receiver 1 connected in series, an amplifier 2, a trigger 3, a phase comparison circuit 4, the first and second inputs of which are connected via a coincidence circuit 5 to the signaling device 6, a filter 7, an adder 8, the second input of which is connected to a constant voltage source 9 and a controlled oscillator 10, the output of which is connected to the second input of the ultrasonic transmitter 11. Trigger input 3 is connected via a demodulator 12 to the output bus of the device (not indicated).

The receiver 1 and transmitter 11 are made in the form of piezoceramic vibrators.

In an ultrasound line consisting of a transmitter 11 and a receiver 1, the vortices formed in the Pocket vortex track as an amplitude-modulated signal by the receiver 1 are converted into electrical oscillation.

The amplitude of the electrical oscillation by the amplifier 2 is increased, while between the input and output signal of the amplifier 2 there is a hard phase coupling.

The received signal on the one hand goes to the demodulator 12, the output of which has a measuring signal proportional to the vortex frequency, and on the other hand it is limited to the trigger 3. Then, together with the transmission signal from the transmitter 11, it goes to the phase comparison circuit. can recognize phase differences in & p 0 ... 2n. At the output of phase comparison circuit 4, a sequence of pulses is formed whose frequency is proportional to the required carrier frequency of the transmitter 11, and the fill factor is proportional to the required sub Royko phases. Filter 7 determines the damping and transient response of the elements forming the control loop.

The resulting DC voltage consists of components that are dependent on frequency and phase. This voltage and the voltage set by the adjustable voltage source 9, in accordance with the frequency position of the vibrators, are added by the adder 8. The resulting voltage is supplied to the voltage controlled oscillator 10, which forms the frequency of the transmitter 11.

In the device, the carrier frequency of the ultrasound signal transmitter is consistent with the actual parameters of the breathing gas so that the optimum proportional signal is constantly available.

for further processing in the circuit diagram for pulse counting when measuring tidal volume.

By using an additional voltage source 9 in the device, the operating range of the controlled voltage of the oscillator 10 is consistent with the frequency range due to variations in the parameters, thereby reducing the measurement error.

With the help of the coincidence circuit 5, the phase mismatch between the sent and received signals is checked. This ratio is monitored by the detector 6 and thereby the control

correct functioning of the entire device.

Claims (1)

Invention Formula A device for generating respiratory pulses, comprising an ultrasonic receiver and transmitter, which is connected to an oscillator, amplifier, trigger, phase comparison circuit, filter, coincidence circuit, demodulator, characterized in that, in order to increase the sensitivity and accuracy of measurements, into it a signaling device and a series-connected constant-voltage source and an adder are introduced, and the ultrasonic receiver, amplifier, trigger, phase comparison circuit, filter, adder, oscillator, and ultrasonic transmitter are connected us successively, wherein the first and second inputs of a phase comparison circuit connected to the first 5 and the second inputs of the coincidence circuit, the second of the inputs is also connected to the output of the oscillator, the output of the coincidence circuit is connected to the signaling device, in addition, the output of the amplifier is connected to the output bus through the demodulator.