RU2324168C1 - Portable device for determining marker gases in expired air - Google Patents

Abstract

FIELD: measuring techniques.

SUBSTANCE: portable device for determining marker gases in expired air consists of case with a hood and two branch pipes for sample injection and cleaning the whole system. Inside the case there are piezoelectric sensors with sensitive film coating for detecting basic components of gas mixtures. The portable device also contains devices for stimulating oscillations and detecting signals from the piezoelectric sensors. The case is made from fluoroplastic material and is kept in an upright position by a removable ring on a plug-in post with a platform. The miniature stimulation circuit is tightly fixed to the hood. The piezoelectric sensor(s) signal is registered by a portable device, the scale of which is graduated in units of frequency and concentration of the test gas. The stimulation circuit and registering device are autonomously powered by a built-in supply. The whole device is portable.

EFFECT: decrease in size; increase in mobility.

1 tbl, 1 dwg

Description

The invention relates to a technique for express analysis of air exhaled by patients to determine micro-concentrations of gases in it, which are markers of disorders of the homeostatic state of the body, for the purpose of diagnosing extempore, including in off-laboratory conditions.

The closest in technical essence and the achieved effect is a gas analyzer based on a monosensor detection cell with one piezosensor of volumetric acoustic waves. A gas analyzer is a combination of several blocks: a detection cell — a housing with nozzles for creating flowing and static operating conditions, inside of which there is a piezosensor (working element); on the lid of the cell there are conclusions to the blocks for generating oscillations and recording signals of the piezosensor; registration is carried out by a frequency meter or a computer through an adapter. A power source (12, 220 W) is required for all analyzer units (oscillation generation schemes, frequency counter), and the cell cover must remain motionless to eliminate twisting of wires and impaired stability of piezosensors. The sample is introduced through the side pipe. As a result of the interaction of gases with a sorbent film on the piezosensor electrodes, their oscillation frequency changes, which is fixed by a frequency meter and an operator or computer. Data processing is carried out by the operator or using a special program (Pat. 2205393 Russia, Korenman Y.I., Shlyk Yu.K., Kuchmenko T.A., Kudinov D.A. - Detection cell for analysis of gaseous media. - IPC 7 G01N 30/62. - No. 2002117396/28 - Declared June 28, 2002; publ. May 27, 2003 - Bull. No. 15 // Inventions. 2003. No. 15, Part 2. C.476).

The disadvantages of the existing gas analyzer based on the detection cell are the insufficient compactness of all associated units and circuits, the inability to quickly and easily move, the need for a power source to ensure the operation of the device, the need to process the piezosensor signals and special operator training, low noise immunity due to poor connection of all units and especially electrical circuits, which leads to distortion of the analysis results.

The technical task of the invention is to increase the mobility and compactness of a gas analyzer based on a detection cell with one or more piezosensors by changing the size and technical parameters of each unit, new design solutions that allow you to quickly move with the analyzer without special conditions and equipment, including during express analysis air exhaled by patients to determine micro-concentrations of gases in it, which are markers of diseases for the purpose of their cytodiagnosis or dividing violations homeostatic state of the body, including in non-laboratory environments.

The technical problem of the invention is achieved in that in a portable device for determining gas markers in exhaled air, comprising a housing with a lid and two nozzles for introducing a sample and regenerating the entire system, inside which piezosensors with sensitive film coatings are located to fix the main components of the gas mixture, the device to excite oscillations and fix the signals of piezosensors, it is new that the housing is made of fluoroplastic and is held in a vertical position by a detachable with a face on a plug riser with a platform, the miniature excitation circuit is rigidly fixed to the cover, and the signal of the piezosensor (piezosensors) is recorded by a portable device, the scale of which is graduated in units of frequency and concentration of the test gas, while the excitation circuit and the recording device are independently powered by the built-in battery, while the entire device is portable.

The technical result consists in the fact that the proposed portable device for determining gas markers in exhaled air on the basis of one or more piezosensors is mobile and compact by changing the size and technical parameters of each unit, developing and rigidly attaching a miniature excitation circuit to the lid, securing the device body , which is made of fluoroplastic, on a plug riser, recording the signal of the piezosensor (piezosensors) with a portable device (frequency meter), while the excitation circuit and the frequency meter is powered autonomously using replaceable batteries or other batteries. Such a constructive solution allows you to quickly move with the analyzer without special conditions and equipment when performing an express analysis of the air exhaled by patients (including children and infants) to determine micro-concentrations of gases in it, which are markers of diseases for the purpose of their cytodiagnosis and disorders of the homeostatic state of the body, including including in situ laboratory work in situ.

The drawing shows a General diagram of a portable device.

A portable device for determining gas markers in exhaled air is based on one or more piezosensors and is a fluoroplastic housing 1 with a cover 2 and two nozzles 3 for introducing a sample of exhaled air and regenerating the system; holders for piezosensors (piezosensors) are located on the cover 4, oscillation excitation circuit 5, which is connected by a cable 6 to a power source 7 and an instrument (for example, a frequency meter) 8. The display 9 of the portable instrument is calibrated in units of frequency and gas concentration -tester . Power supply 7, device 8, scoreboard 9 - everything is built into one case. The cylinder is held by a detachable ring 10, rigidly connected to the riser 11, made in the form of a plug pipe and connected to a stable platform 12, while the device for turning on the periodic mode is switched on and off by the handle (button) 13.

A portable device for determining gas markers in exhaled air works as follows.

A piezosensor (piezosensors) 5 with a selective sorbent film on the electrodes is fixed in a holder on the cover 2, which is attached to the housing of fluoroplastic 1, which is held vertically by a split ring 10 on the plug riser 11 with the platform 12. A miniature oscillation excitation circuit 4 of the piezosensor is rigidly fixed to the cover. (piezosensors), which is driven by a power source 7, connecting to it and a reading device (for example, a frequency meter) 8 using cables 6. The device is turned on by a handle (button) 13, when 9 is board shows the device noise frequency deviation. A sample of a small volume of air exhaled by the patient is injected through the side pipe 3. Marker gases of certain diseases (ammonia, ketones, alcohols, acids, etc.) are sorbed by a thin film on the piezosensor electrodes in accordance with their nature and concentration. As a result of this, the oscillation frequency of the piezosensor changes, which is recorded by a device whose scale is calibrated by the frequency and concentration of the gas being determined. After measurement, the gas analyzer is regenerated by air blown through the cell, or with the lid open.

A comparison of some characteristics of the proposed technical solution and the closest analogue is presented in the table.

The proposed portable device for determining marker gases in exhaled air allows you to:

1) to achieve compactness of the gas analyzer, the possibility of disassembling it into composite blocks of small sizes, convenient for carrying from one place to another;

2) by changing the size and technical parameters of each unit allows you to quickly move without special conditions and equipment, regardless of the power source when conducting an express analysis of air exhaled by patients, including children, to determine the micro-concentrations of gases that are markers of diseases, in order to cytodiagnostics of violations of the homeostatic state of the body, including in non-laboratory conditions in situ;

3) significantly simplify the stage of obtaining, processing analytical information and making decisions without complex mathematical algorithms, calculation programs.

Table Comparison of the characteristics of the proposed solution and analog Comparison options Technical solution Analogue Analysis of gas samples in static and dynamic modes Available Available Data processing Automatic registration of signals on the display of the frequency meter indicating the concentration of marker gases Formation of total analytical signals for the set of recorded responses using popular programs (Word, Excel) or the use of a calibration graph for each registered gas The need for an electrical network to ensure the operation of the excitation circuit and the frequency meter Autonomous power supply from the built-in element Necessary and necessary Ability to move and compact packaging Perhaps portable. It is not possible to move the entire installation, it is necessary to have a device for fastening at the place of movement due to data recording and processing devices (frequency counter, computer) Operating modes Discrete action, the time without replacement is determined by the technical characteristics of the batteries (batteries) Mains power; continuous and discrete

Claims (1)

A portable device for determining marker gas in exhaled air, including a housing with a lid and two nozzles for introducing a sample and regenerating the entire system, inside of which piezosensors with sensitive film coatings are located to fix the main components of the gas mixture, a device for exciting oscillations and recording signals from piezosensors, characterized in that the housing is made of fluoroplastic and is held upright by a detachable ring on a plug riser with a platform, miniature the excitation ma is rigidly fixed on the cover, and the signal of the piezosensor (piezosensors) is recorded by a portable device, the scale of which is graduated in units of frequency and concentration of the gas-test, while the excitation circuit and the recording device are independently powered by the built-in battery, while the entire device is made portable.