SU232444A1 - DEVICE FOR CONTINUOUS REGISTRATION OF MEDIUM ARTERIAL PRESSURE - Google Patents

Description

Devices for the continuous recording of mean arterial pressure, comprising a tracking system, a pneumatic setter and a recording device, are known.

Measurements by such devices of mean arterial pressure are based on the generally accepted assumption that when an external pressure is imposed on a blood vessel in a vessel, when equality between mean blood pressure and external pressure is established, maximum pulse oscillations occur (Mare principle).

The proposed device differs from the known ones in that it has a differential tracking system, including two sensing cuffs, such as a fingertip, a differential pressure gauge, two transducer amplifiers, two amplifiers loaded on a differential relay, and two electromagnetic pneumo-ventilators.

This embodiment of the device provides automatic continuous registration of mean arterial pressure without disturbing hemodynamics.

The drawing shows a schematic block diagram of the described device.

Each cuff is connected to an amplifier transducer 3, in which the pulse oscillations are converted into electrical pulses.

These pulses are amplified in amplifiers 4, to the output of which a common load is connected — a differential relay 5. The relay actuates one of the two electromagnetic pneumatic valves 6, by means of which either the pressure in the pneumatic system of the device is released into the atmosphere or the system is pressurized from the source compressed air - cylinder 7. Record the recorded average pressure produced by the device 8.

In this device, the external pressure is maintained by an automatic tracking system at the level of maximum pulse oscillations, i.e. at the level of average blood pressure. Using a differential pressure gauge 2, an external pressure is measured, the value of which is assumed to be equal to the mean arterial pressure.

External pressure is created in two squeezing finger cuffs. The external pressure source is compressed air contained in the cylinder 7. The electric pressurized valves controlled by electrical signals from the relay 5 regulate the amount of pressure created in the cuffs.

differs from the measured average pressure Pjp; in one cuff it is lower than the average pressure, for example, 10 mm Hg. Art., and in the other - at 10 mm Hg. Art. above. The oscillations perceived by the cuffs are different from the maximum, but equal to each other. Their difference is zero. When the arterial pressure changes by a certain amount, the oscillation equality is disturbed and an oscillation difference arises. This difference in oscillation, the conformation of the difference in electrical signals and amplification, controls the operation of electromagnetic ventilation valves, which bring the external pressure back to levels determined by the equality of mm Hg. Art. - Р2-10 mm Hg. Art.

4 Subject of the invention

A device for continuous recording of mean arterial pressure, comprising a trace system, a pneumatic unit and a recording device, characterized in that, in order to provide automatic continuous registration of mean blood pressure without disturbing homodynamics, a differential tracking system is installed, including two sensing cuffs, such as a fingertip, a differential pressure gauge, two transducer amplifiers, two amplifiers loaded onto a differential relay, and two electromagnetic pneumatic ventilator.