SU1113091A1 - Apparatus for determining the absorbed dose of aerosols - Google Patents

Description

00

about with

The invention relates to the study of aerosols of inhaled air and can be used for sanitary-hygienic studies.

A device for detecting aerosols entering the body is known, which contains a mask with inhalation-exhalation valve system, a filter in the inhalation channel 1.

When using a known device, aerosols get onto the filter only during inhalation and their amount on the filter depends on the frequency and depth of breathing, however, aerosols that are removed from the body during expiration are not taken into account, and therefore the absorbed dose of aerosols can only be judged that the number of aerosols retained in the body depends on their dispersion

The purpose of the invention is to increase the accuracy of determining the amount of aerosols retained in the body.

The goal is achieved by the fact that in a device for determining the absorbed dose of aerosols containing a mask for sealing the respiratory organs

with inhalation-exhalation valve system, filter holder and filter in the inhalation channel, the filter holder in the inlet channel has two inlets, one of which is directly communicated, and the other through the filter with the inhalation channel, the mask additionally contains a filter holder and a filter in the channel expiration, the device also contains series-connected breath parameter sensors, a control circuit, an electric actuator and valves installed with the possibility of their blocking the inlet openings communicating with the environment, and ktroprivod rigidly connected to the mask.

The drawing schematically shows the proposed device.

The device contains a rubber mask 1 in the form of an elastic cuff 2, designed to provide tight contact and connected to the body, in the central opening of which are located the breathing control valves 3 inhalation and 4 legs, containing a saddle, embedded along the perimeter of the walls: the center: breathable inlet wall , and moving parts of elastic material, cantilever reinforced on one of the walls of the nozzle 5 of the central channel, inhale the breath.

The body of the mask 1 has a side opening made with the possibility of communication with the channel of exhalation and contains the holder 6 of the filter 7 in the latch channel. The housing also contains a holder 8 of the filter 9 in the inhalation channel with two openings 10 and 11 under the valves 12 and 13, controlled by a solenoid 1, with one of the said valves directly communicating and another. the cut filter is installed - with the central inhalation channel. The device also contains a three-armed rocking chair 15 mounted for swinging about an axis 16 rigidly fixed on the mask body 1. The first arm of the rocker 15 is connected to the bark 17 of the electric drive in the form of a solenoid 14 connected to the output of control circuit 18, the input of which is connected to the output of sensor 19 respiration parameters, with the two remaining arms of the rocker 15 are connected, respectively, the shutters of the valves 12 and 13, controlled by the solenoid 14. The latter contains a winding and a return spring (not shown).

The output of sensor 19 is a signal, one half-wave of which corresponds to the inspiratory phase and the second to the expiratory phase.

The device works as follows.

At the beginning of inhalation, the solenoid 14 triggers and one of the channels of the filter holder 8 intersects with the valve 13. At the same time, the inhaled air passes through the filter in the inhalation channel and aerosol in the inhaled air is deposited on it, following the inhale output on the filter in the inhalation channel aerosol is precipitated because it is not present in exhaled air.

At the beginning: the next breath in connection with the end of the output impulse of the circuit 18, the measles 17, under the action of the return spring, returns to the initial state, and the valve 12 closes the channel communicated through the filter in the inspiratory channel with the central inspiratory channel central inhalation channel communicates with the surrounding atmosphere. The inhaled air with the aerosol through the respiratory organs and with the ensuing exhaled air following it, an aerosol is present which is deposited on the filter in the exhaust duct. After performing work in the order of 10-30 minutes associated with the release into the air of the working area aero75

12 1

I t t I 914 ashes, filters are weighed to determine the mass of aerosol deposited on them, and the number of aerosols retained in the body is judged by the difference in the mass of aerosols in samples of inhaled and exhausted air.

Claims (1)

(5.7) DEVICE FOR DETERMINING AN ABSORBED DOSE OF AEROSOLS, containing a mask ~ for sealing the respiratory organs with an inhalation-expiration valve system, a filter holder and a filter in the inspiration channel, characterized in that, in order to increase the accuracy of determining the number of aerosols trapped in the body, the holder the filter in the inspiration channel has two inlet openings, one of which is communicated directly and the other through the filter with the inspiration channel, the mask additionally contains a filter holder and a filter in the exhalation channel, the device also contains consequently connected respiration sensor, control circuit, electrical. water and valves installed with the possibility of sequential shut-off. they receive inlets connected to the environment, and the electric drive is rigidly connected to the mask.