SU1076084A1 - Apparatus for determining the nose air conduction - Google Patents

Abstract

A DEVICE FOR DETERMINING AIR CONDUCTIVITY, containing a series-connected breathing mask, an air pressure differential pressure sensor and a mouthpiece, as well as a pressure measuring unit, the inputs of which are connected to a pressure difference sensor, characterized in that, in order to shorten the time for conducting research, it contains a pressure sensor air flow rate, located at the respiratory entrance of the mask; and a two-coordinate recording device, the inputs of which are connected to the outputs of the pressure measuring unit and the air velocity sensor.

Description

The invention relates to medicine and is used to determine the functioning of the nose.

There is a device for studying the air flow through the nose, containing a compressor with a constant air flow rate, having two chambers with suction and discharge fittings, pressure gauge systems with an inclined tube, air flow control valves, gauge switching valves [1].

The disadvantage of this device is the large measurement error introduced by the forced flow of air, the movement of which dries the walls of the nose and, therefore, changes its tone and conductivity. In addition, only a part of the nose is subjected to measurement, namely its nasal cavity, the vestibule of the nose is not measured, since the olive of the apparatus is inserted into it.

. Closest to the proposed is a device for determining the air conduction of the nose, containing a tube, a breathing mask, a sensor for differential pressure of the air flow, a recording device and a mouthpiece [2].

A disadvantage of the known device is the low accuracy of the measurements, since the measurements are influenced by the intensity and rhythm of respiration, as well as the long duration and complexity of the study, in which it is necessary to change the lumen of the diaphragm of the air respiratory channel and at the same time observe the readings of the pressure gauges.

The purpose of the invention is the reduction of measurement time.

This goal is achieved by the fact that the device for determining the air conduction of the nose, containing a breathing mask connected in series, an air pressure difference sensor and a mouthpiece, as well as a pressure measuring unit, the inputs of which are connected to a pressure difference sensor, further comprises an air flow velocity sensor, located at the respiratory inlet of the mask, and a two-coordinate recording device, the inputs of which are connected to the outputs of the pressure measuring unit and the air velocity sensor ..

The drawing shows a structural diagram of a device.

The device contains an elastic mask 1, tubes 2 and 3 connecting the mask 1 with a differential inductive differential pressure sensor 4 in the nose, an air breathing channel 5 with a platinum thread 6, a transducer 7 for air velocity into an electrical signal, a pressure measuring unit 8, I register two-coordinate instrument 9 and mouthpiece 10.

The device at once.

In the original tubes 2 and 3. .

the pressure of the sensor 4 is zero, the voltage at the output of block 8 is also zero, the air tray through the respiratory channel 5 is absent, '5 the platinum thread 6 through which the electric current passes is maximally heated, and therefore the voltage at the output of the transducer 7 is also zero. So the pen is register-. torus 9 in the initial state is at point 0 of the origin. Then the patient puts a mask 1 on his face, takes a mouthpiece 10 in his mouth above the tongue and, after tightening his lips, takes a deep breath through his nose. The air flow passing through the channel 5, respectively, of the air velocity cools the thread 6. In this case, a voltage proportional to the air velocity arises at the output of the converter 7.

At the same time, when entering the nose, an air pressure drop occurs, which is supplied through the tubes 2 and 3 to the sensor 4 and a voltage proportional to the square root of the pressure drop appears at the output of block 8 25.

I '

The air conductivity of the nose is determined as follows: With the simultaneous action of the output voltages of the transducers 7 and 8 at the corresponding inputs of the recorder 9, the pen draws a curve of pressure drop versus air speed on chart paper.

At the end of inspiration (before exiting), a constant speed and differential pressure mode is established, the recorder's pen 9 stops for a short time (A), and then, when exiting, the origin (O) returns to its original position.

From point O of the origin to point A, draw a straight line and eme-. dig the tangent of the angle o between the ordinate Y ΔΡ and OA. The tangent of the angle αί is the ratio of two legs, respectively equal to W and Ud P

Thus, the tangent of the angle d is a measure of the air conductivity of the nose.

VNIIIPI. Order 574/5

Circulation 688 operates as follows, the pressure is the same and the differential

Branch of the PPP Patent, Uzhgorod, Project 4,

Claims (1)

DEVICE FOR DETERMINING NOSE AIR CONDUCTIVITY, comprising a breathing mask connected in series, an air pressure differential pressure sensor and a mouthpiece, and a pressure measuring unit, the inputs of which are connected to a pressure differential sensor, characterized in that, in order to reduce the time of research, it contains a sensor air flow rate located at the respiratory inlet of the mask; and a two-coordinate recording device, the inputs of which are connected to the outputs of the pressure measuring unit and the sensor