RU15955U1 - RESPIRATORY CENTER EXCITATION ASSESSMENT DEVICE - Google Patents

Abstract

1. A device for evaluating the excitation of the respiratory center, containing a hollow metal tube with a mouthpiece and a fitting for determining the intraoral pressure, connected by an elastic tube to a pressure transducer, the outputs of which are connected to the inputs of the recording device, characterized in that the side of the hollow metal tube is located on the back of the mouthpiece an inductive converter connected to a metal valve with a metal core, the outputs of the inductive converter are connected to a source When using the control button, on the side surface of a hollow metal tube there are two fittings for determining pneumotachograms connected by elastic tubes to a second pressure transducer, the outputs of which are connected to the inputs of the recording device. 2. A device for evaluating the excitation of the respiratory center according to claim 1, characterized in that the metal core of the inductive transducer contains a metal spring. A device for evaluating the excitation of the respiratory center according to claim 1, characterized in that the elastic tubes are made of rubber.

Description

RESPIRATORY CENTER EXCITATION ASSESSMENT DEVICE

The utility model relates to medicine, specifically to pulmonology, and relates to devices designed to determine the excitability of the respiratory center by the severity of occlusal intraoral pressure developed by the subject in the first 0.1 seconds of the inspiration phase.

The closest (prototype) is a device containing a mouthpiece, a hollow metal tube with a valve for manually blocking the lumen of the tube, a fitting on the side surface of the metal hollow tube for determining intraoral pressure, connected by a rubber tube to the input of the pressure transducer, the outputs of which are connected to the inputs of the recording device 1 .

However, this device is inconvenient in operation, it does not allow accurate and high-quality assessment of the excitation of the respiratory center:

1 “The use of a manually operated valve reduces the rate of overlap of the tube’s lumen, which leads to a large number of repetitions of this maneuver in order to achieve accuracy in the exhalation phase.

2 „It is not always possible to clearly determine the start of inspiration and expiration from the curve of the intraoral pressure and movements of the chest, which leads to the overlap of the lumen of the tube not exactly during the exhalation phase.

3. Overlapping the tube lumen manually with the flapper is ergonomically uneconomical and inconvenient, and does not guarantee complete overlap of the tube lumen due to possible inaccurate hand movements and consequent leakage between the flap and the tube walls.

4 о It is impossible to precisely control the degree of tightness of the valve closure by the intraoral pressure, since it constantly changes, both before the valve closes and after closure.

IOC: & 61B5 / Q8

The problem solved by the proposed utility model is to increase the accuracy of the study, the quality of evaluation and ease of use.

The problem is solved by a device for evaluating the excitation of the respiratory center.

The device contains (Fig. 1) a hollow metal tube (1) with a mouthpiece (2) at one end and an inductive converter (3) in the form of a winding (4) and a metal core (5) with a metal spring (6) ) connected to a metal valve (7). The winding (4) of the inductive converter (3) is connected to the power source (8) through the control button (9). On one of the side surfaces of the hollow metal tube (1), there is a union (10) for measuring intraoral pressure, connected by an elastic tube (11) to a pressure transducer (12) and two nozzles (13) for determining pneumotachograms, connected by elastic tubes (14) with a second pressure transducer (15), the elastic tubes being made of rubber. The outputs of both pressure transducers (12, 15) are connected to the inputs of the recording device (16).

The device operates as follows. The patient takes the mouthpiece (2) into his mouth (Fig. 1), tightly wraps it around his lips and breathes calmly through a hollow metal tube (1) with an open valve (7) and a fixed spring (6). To stop nasal breathing, a special clip is put on the patient’s nose. During the exhalation, which is precisely determined by the pneumotachogram, the researcher presses the control button (9) and closes the electric circuit of the inductive transducer (3) о. In this case, an electromagnetic flow is created in the winding (4), causing the metal core (5) of the valve (7) to move clearance of a hollow metal tube (1) with inductive transducer (3). As a result, the valve (7) completely closes the lumen of the hollow metal tube (1) for about 0.5 seconds. The duration of the closure of the lumen of the hollow metal tube (1) by the valve (7) is determined by the time the circuit is closed by the control button (9). According to the research methodology, the patient is not warned about the moment when the hollow metal tube (1) is blocked by the valve (7). After during the patient's exhalation, the lumen of the hollow metal tube (1) was blocked by the valve (7), the patient takes another calm breath.

recording device (16) of the intraoral pressure curve and pneumotachogram obtained using the corresponding pressure transducers (12, 15) .When recording the pneumotachogram during the period of overlapping of the hollow metal tube (1), the valve (7) judges the tightness state of the blocked hollow metal tube (1) . While maintaining tightness, a contour is recorded instead of a pneumotachogram. The excitability of the respiratory center is assessed by the value of the intraoral pressure, which is determined in the first 0.1 seconds of inhalation with a closed lumen of the hollow metal tube (1).

1. The presence of an inductive converter with a metal valve that automatically activates when the control button of the electric circuit closes, allows within 0.5 seconds to completely and hermetically close the lumen of the hollow metal tube for a period of time during which the control button closes the electric circuit “When opened by the control button electrical circuit, a metal valve completely opens the lumen of a hollow metal tube.

2 о The presence of two fittings on the side surface of the hollow metal tube for determining the pneumotachogram allows you to accurately close the lumen of the hollow metal tube with a metal valve in the exhalation phase, as well as to control the tightness of the metal valve closing the lumen of the hollow metal tube.

Thus, the distinguishing features allow a more accurate study, get a better assessment of the excitation of the respiratory center and increases ease of use.

The results of a study of patient G „, 53 years old, with a diagnosis of bronchial asthma, a phase of fading exacerbation are presented.

Before the start of the study, the mouthpiece of the hollow metal tube is treated with alcohol, the operation of the valve of the inductive transducer of the hollow metal tube is checked, the recording channels of the intraoral pressure curve and pneumotachograms of the H3021-3 brand recording device, the inputs of which are connected to the outputs of two PDP YuOOMD brand pressure transmitters, are calibrated. The inputs of the pressure transducer intended for generating a pneumotachogram signal are connected by rubber

TEST EXAMPLE

tubes with two fittings of a hollow metal tube. The first input of the pressure transducer, designed to generate an intraoral pressure signal, is connected by a rubber tube to the third fitting on the side surface of the hollow metal tube, the second input is directly connected to atmospheric air.

The study is carried out as follows. The patient, sitting, takes a mouthpiece in his mouth, tightly grasps his lips and breathes calmly through a hollow metal tube with an open valve. A special clip is put on the patient’s nose to stop nasal breathing. On the recording device with a speed of 50 mm / s, the curve of intraoral pressure and pneumotachograms are recorded (Fig. 2), where a is the end of the exhalation and the beginning of the inspiration, b - the end of the inspiration and the beginning of the exhalation. The pneumotachogram clearly defines the transitions between the phases of inspiration and expiration, compared with the curve of intraoral pressure.

As soon as the expiratory phase is determined by the pneumotachogram, the researcher, without warning the patient (according to research method 1), presses the control button and the valve closes the lumen of the tube through which the patient breathes (point c). We check the tightness of the overlap of the lumen of the tube by the pneumotachogram, - the isoline is recorded (segment v-g), so the tightness is not broken. The intraoral pressure curve after the valve closes the tube’s lumen gradually becomes equal to the contour (segment b-a) and, from the moment of the start of inspiration, sharply deviates from the contour (segment a-e-g).

The duration of the overlap of the lumen of the tube by the valve is determined by a time period of 0.1 sec. At a recording speed of 50 mm / sec, a recording segment of 0.1 sec will correspond to 5 mm. Thus, the valve can be opened when the length of the deviation of the intraoral pressure curve from the beginning of the inspiration is over the isoline of more than 5 mm, for example, 10 mm. It should be noted that a valve with a fixed time of overlapping the tube’s lumen is unacceptable, since the overlapping of the tube’s lumen begins in the expiratory phase of the test, the duration of which directly depends on the respiratory rate, which is a very variable indicator. After opening the valve (point g), the patient is disconnected from the mouthpiece and the clip is removed from the nose. This is where the study ends.

removal from the contour (segment d-e) 0.1 seconds (segment a-d) after the start of inspiration with a blocked tube lumen by the valve. The PO, I values are measured in cm of water. Art.

Calculation of P0, i is carried out according to the formula:

where H is the deviation of the intraoral pressure curve from the contour (mm) 0.1 second after the start of inspiration with the valve closed, the K is the calibration coefficient of the recording channel of the intraoral pressure curve (cm water / mm).

When examining patient G., the following values were obtained: H 10.5 mm, K 0.384 cm water. Art./mm. The value of P0, i is 4.032 cm of water. Art. (10,, 384), which indicates an increase in the excitability of the respiratory center in patient G., according to the literature 2. It should be noted that there are two options for designating the indicator of the excitability of the respiratory center: P0, i and RSO- When measurements are carried out in seconds, use P0, i (0.1 sec), when in milliseconds - P10o (100 milliseconds, which is similar to O, 1 sec) „

The proposed device allows you to:

1. Exactly block the lumen of the tube, in accordance with the research methodology, in the exhalation phase, focusing on recording the pneumotachogram.

2. Accurately evaluate the tightness of the overlap of the tube lumen with a valve using a pneumotachogram.

3. To improve the quality of research by reducing the number of repeated research maneuvers and artifacts as a result of the exact implementation of the research methodology.

4. Improve the usability of the device for the researcher due to the replacement of low-ergonomic hand movements (moving the shutter manually) with ergonomic (pressing the control button).

5. To increase the convenience of the study for the subject by quickly closing and opening the tube lumen with the valve, as well as by reducing the number of repeated research maneuvers.

1.West J. Physiology of respiration. The basics. - Per. from English - M.: Mir, 1988 .-- S. 132-133.

Po, i

LITERATURE

Claims (3)

1. A device for evaluating the excitation of the respiratory center, containing a hollow metal tube with a mouthpiece and a fitting for determining the intraoral pressure, connected by an elastic tube to a pressure transducer, the outputs of which are connected to the inputs of the recording device, characterized in that the side of the hollow metal tube is located on the back of the mouthpiece an inductive converter connected to a metal valve with a metal core, the outputs of the inductive converter are connected to a source When using the control button, on the side surface of a hollow metal tube there are two fittings for determining pneumotachograms connected by elastic tubes to a second pressure transducer, the outputs of which are connected to the inputs of the recording device.  2. A device for evaluating the excitation of the respiratory center according to claim 1, characterized in that the metal core of the inductive transducer contains a metal spring. 3. A device for evaluating the excitation of the respiratory center according to claim 1, characterized in that the elastic tubes are made of rubber.