CN214150740U

CN214150740U - Multi-channel gas detector

Info

Publication number: CN214150740U
Application number: CN202120016641.1U
Authority: CN
Inventors: 史春晖
Original assignee: Hefei Miaokelai Biotechnology Co ltd
Current assignee: HEFEI WEIGU MEDICAL TECHNOLOGY CO.,LTD.
Priority date: 2021-01-06
Filing date: 2021-01-06
Publication date: 2021-09-07
Anticipated expiration: 2031-01-06

Abstract

The utility model relates to a multi-channel gas detector, including nose expiration entry, mouth expiration entry, air chamber one and air chamber two. The nasal exhalation inlet is connected with the inlet of the first air chamber through the first air pipeline, and the outlet of the first air chamber is respectively connected with the second air pipeline and the third air pipeline. And a first pump and a first stop valve are arranged on the second gas pipeline. And a first electromagnetic valve is arranged on the third gas pipeline. The first port of the electromagnetic valve is connected with the outlet of the first air chamber, and the second port of the electromagnetic valve is connected with the inlet of the second air chamber. The mouth expiration inlet is connected with the inlet of the air chamber II through the gas pipeline IV, and the outlet of the air chamber II is respectively connected with the gas pipeline V and the gas pipeline VI. And a second stop valve is arranged on the gas pipeline five. And a humidity balance unit, a second pump and a gas detection unit are sequentially arranged on the gas pipeline six. The utility model discloses set up mouth expiration simultaneously and detected and two passageways are detected with nose expiration, realize the detection of multiple expiratory gas on same device, the testing process is simple and convenient, and check-out time is short, has avoided medical resource waste.

Description

Multi-channel gas detector

Technical Field

The utility model relates to an expiration composition detects technical field, concretely relates to multichannel gas detector.

Background

The main functions of the exhaled nitric oxide detector in the existing market are mainly FeNO for testing the concentration of nitric oxide in exhaled breath at the mouth and FnNO for testing the concentration of nitric oxide in nasal cavity. According to the technical standards of ATS and ERS in 2005 and the technical standards updated by ERS in 2017, the FeNO test sampling requirements are as follows: inhaling deeply with the mouth, then exhaling slowly, then closing the soft palate with an expiratory pressure of 5-20cmH2O, and monitoring the 10% error range of the expiratory flow rate at a set flow rate (e.g., 45-55 ml/s); the sampling requirements for FnNO are: one nostril was plugged with olive head and the other nostril was opened, and the user resisted 10cmH of exhalation through the mouth after deep inhalation₂O resistance, whistling expiration, spontaneous lifting of the soft palate, and the like, and then the detector evacuates air from the open nostril at a certain speed.

Because the sampling positions of FeNO and FnNO are different, the FeNO and FnNO use different fittings, and a disposable mouth expiration filter and a disposable nose expiration filter are needed respectively. The patient requires two samples at the time of testing. And replacing the accessories, and respectively sampling and analyzing. In the actual detection process, whether FnNO detection is needed is often judged according to the detection value of FeNO, for a patient needing FnNO detection, one time more waiting detection time and actual detection time are needed, the detection process is complex, and waste of medical resources is caused.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a multichannel gas detector, this gas detector have set up mouth expiration detection route and two routes of nose expiration detection route simultaneously, can realize the detection of multiple expiratory gas on same device, and the testing process is simple and convenient, has effectively shortened check-out time, has avoided medical resource's waste.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a multi-channel gas detector comprises a nasal expiration inlet, an oral expiration inlet, a first air chamber and a second air chamber.

The nasal exhalation inlet is connected with an inlet of the first air chamber through a first gas pipeline, and an outlet of the first air chamber is respectively connected with a second gas pipeline and a third gas pipeline; a first pump and a first stop valve are arranged on the second gas pipeline; a first electromagnetic valve is arranged on the third gas pipeline; and the port I of the first electromagnetic valve is connected with the outlet of the first air chamber, and the port II of the first electromagnetic valve is connected with the inlet of the second air chamber.

The mouth exhalation inlet is connected with the inlet of the air chamber II through the gas pipeline IV, and the outlet of the air chamber II is respectively connected with the gas pipeline V and the gas pipeline VI; a second stop valve is arranged on the gas pipeline five; and a humidity balance unit, a second pump and a gas detection unit are sequentially arranged on the sixth gas pipeline.

Furthermore, a second electromagnetic valve is arranged on the first gas pipeline.

Further, an outlet of the first air chamber is connected with a second gas pipeline and a third gas pipeline through a first tee joint; the first port of the first tee joint is connected with the outlet of the second air chamber, the second port of the first tee joint is connected with the inlet of the first pump, and the third port of the first tee joint is connected with the first port of the first electromagnetic valve; and the outlet of the first pump is connected with the inlet of the first stop valve.

Further, a three-way joint II, a pressure sensor and a solenoid valve III are arranged on the gas pipeline IV; the first port of the three-way joint II is connected with an exhalation inlet, the second port of the three-way joint II is connected with the first port of the electromagnetic valve III, and the third port of the three-way joint II is connected with the input end of the pressure sensor; the port II of the electromagnetic valve I is connected with the inlet of the air chamber II through the tee joint II; and a port I of the three-way joint is connected with a port II of the electromagnetic valve III, the port II is connected with an inlet of the air chamber II, and the port III is connected with a port II of the electromagnetic valve I.

Further, an outlet of the air chamber II is connected with a gas pipeline V and a gas pipeline VI through a tee joint IV; a first three-way electromagnetic valve is arranged on the gas pipeline VI; a port I of the three-way joint is connected with an outlet of the air chamber II, a port II of the three-way joint is connected with an inlet of the stop valve II, and a port III of the three-way joint is connected with a port I of the three-way electromagnetic valve I; a port II of the first three-way electromagnetic valve is connected with a gas pipeline VII, a filter is arranged on the gas pipeline VII, and the port II of the first three-way electromagnetic valve is connected with an inlet of the filter; and the third port of the first three-way electromagnetic valve is connected with the inlet of the humidity balancing unit, the outlet of the humidity balancing unit is connected with the inlet of the second pump, and the outlet of the second pump is connected with the inlet of the gas detection unit.

Further, the humidity balancing unit adopts a Nafion pipe.

Further, the gas detection unit adopts an electrochemical sensor.

Furthermore, the electromagnetic valve III is a three-way electromagnetic valve, and the three-way electromagnetic valve is a three-way electromagnetic valve II; a three-way electromagnetic valve III is arranged on a gas pipeline between the air chamber II and the three-way joint IV; the first port of the three-way electromagnetic valve II is connected with the second port of the three-way joint II, the second port of the three-way joint II is connected with the first port of the three-way joint III, and the three-port of the three-way electromagnetic valve II is connected with the third port of the three-way electromagnetic valve III through the air chamber III; and a port I of the three-way electromagnetic valve III is connected with an outlet of the air chamber II, and a port II of the three-way electromagnetic valve III is respectively connected with an inlet of the stop valve II and a port I of the three-way electromagnetic valve I.

According to the above technical scheme, the utility model discloses set up mouth expiration detection way and two routes of nose expiration detection way simultaneously, can realize the detection of multiple expiratory gas on same device, testing process is simple and convenient, has effectively shortened check-out time, has avoided medical resource's waste.

Drawings

FIG. 1 is a schematic block diagram of a gas detector according to one embodiment;

FIG. 2 is a schematic block diagram of a gas detector according to the second embodiment;

FIG. 3 is a graph of a raw analysis of a gas detector according to one embodiment.

Wherein:

1. the nasal exhalation system comprises a nasal exhalation inlet 2, a second electromagnetic valve 3, a first air chamber 4, a first three-way connector 5, a first pump 6, a first stop valve 7, a first electromagnetic valve 8, a first mouth exhalation inlet 9, a second three-way connector 10, a pressure sensor 11, a third electromagnetic valve 12, a third three-way connector 13, a second air chamber 14, a fourth three-way connector 15, a second stop valve 16, a first three-way electromagnetic valve 17, a filter 18, a humidity balance unit 19, a second pump 20, a gas detection unit 21, a third air chamber 22 and a third three-way electromagnetic valve.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

example one

As shown in figure 1, the multi-channel gas detector comprises a nasal exhalation inlet 1, an oral exhalation inlet 8, a first air chamber 3 and a second air chamber 13. And the first air chamber 3 and the second air chamber 13 are used for storing the gas to be detected. Two air chambers all adopt long and thin PTFE plastic tubing, and the pipe diameter of this PTFE plastic tubing is 3 ~ 5mm, and length is 2 ~ 20m, and the design can make gaseous flow state in the laminar flow in whole detector like this, and gaseous emergence is not mixed as far as possible around guaranteeing. In fig. 1, the upper side is a nasal exhalation detection path, and the lower side is an oral exhalation detection path. The utility model discloses set up nose expiration detection route and mouth expiration detection route simultaneously, can gather the gas that meets the requirements in mouth expiration and the nasal cavity gas simultaneously, detect the gas molecule concentration that wherein needs the test.

The nasal exhalation inlet 1 is connected with an inlet of the air chamber I3 through the air pipeline I, and an outlet of the air chamber I3 is connected with the air pipeline II and the air pipeline III respectively. A first pump 5 and a first stop valve 6 are arranged on the second gas pipeline; and a first electromagnetic valve 7 is arranged on the third gas pipeline. The port I of the first electromagnetic valve 7 is connected with the outlet of the first air chamber 3, and the port II of the first electromagnetic valve 7 is connected with the inlet of the second air chamber 13. The nasal exhalation detection path on the upper side and the oral exhalation detection path on the lower side are connected through the three-way joint I4, the three-way joint II 12 and the electromagnetic valve I7. And the connection and disconnection between the air chamber I3 and the air chamber II 13 are realized by controlling the on-off of the electromagnetic valve I7. The utility model discloses two air chambers of air chamber one 3 and air chamber two 13 have been set up for the expiration of storage different sources. Meanwhile, the elongated tube with the electromagnetic valve I7 is adopted to connect the gas chamber I3 and the gas chamber II 13 in series, so that the gas in the gas chamber I3 and the gas in the gas chamber II 13 can be separated and correspond to each other in the analysis process.

The mouth expiration inlet 8 is connected with an inlet of the air chamber II 13 through a gas pipeline IV, and an outlet of the air chamber II 13 is connected with a gas pipeline V and a gas pipeline VI respectively. And a second stop valve 15 is arranged on the gas pipeline five. And a humidity balance unit 18, a second pump 19 and a gas detection unit 20 are sequentially arranged on the gas pipeline six. The first pump 5 and the second pump 19 play a role of air suction, and the flow rate of air suction can be controlled according to PWM pulse control. The first stop valve 6 and the second stop valve 15 play a role in one-way sealing.

Furthermore, a second electromagnetic valve 2 is arranged on the first gas pipeline.

Further, an outlet of the air chamber I3 is connected with the air pipeline II and the air pipeline III through a tee joint I4. The first port of the first tee joint 4 is connected with the outlet of the second air chamber 13, the second port is connected with the inlet of the first pump 5, and the third port is connected with the first port of the first electromagnetic valve 7. The outlet of the first pump 5 is connected with the inlet of the first stop valve 6.

Furthermore, a three-way joint II 9, a pressure sensor 10 and a solenoid valve III 11 are arranged on the gas pipeline IV. And a port I of the three-way joint II 9 is connected with an exhalation inlet 8, a port II is connected with a port I of a solenoid valve III 11, and a port III is connected with an input end of a pressure sensor 10. And the port II of the electromagnetic valve I7 is connected with the inlet of the air chamber II 13 through a tee joint III 12. And a port I of the three-way joint III 12 is connected with a port II of the electromagnetic valve III 11, a port II is connected with an inlet of the air chamber II 13, and a port III is connected with a port II of the electromagnetic valve I7. The pressure sensor 10 uses gas with known flow rate to calibrate a flow rate-signal curve when leaving a factory, and calculates gas passing flow rate according to a detection signal of passing gas in a detection gas path (gas pipeline four) when in use. A pressure sensor 10 for detecting the pressure of the gas sample, only the gas sample that meets the requirements can enter the gas cell.

Further, an outlet of the second air chamber 13 is connected with a fifth gas pipeline and a sixth gas pipeline through a fourth three-way joint 14; a three-way electromagnetic valve I16 is arranged on the gas pipeline VI; a port I of the three-way joint IV 14 is connected with an outlet of the air chamber II 13, a port II is connected with an inlet of the stop valve II 15, and a port III is connected with a port I of the three-way electromagnetic valve I16; a second port of the first three-way electromagnetic valve 16 is connected with a seventh gas pipeline, a filter 17 is arranged on the seventh gas pipeline, and a second port of the first three-way electromagnetic valve 16 is connected with an inlet of the filter 17; the port III of the three-way electromagnetic valve I16 is connected with the inlet of the humidity balancing unit 18, the outlet of the humidity balancing unit 18 is connected with the inlet of the pump II 19, and the outlet of the pump II 19 is connected with the inlet of the gas detection unit 20. The filter 17 is filled with a chemical or physical material that can filter the gas molecules to be detected in the air, and is used to provide a background signal. And a normally open passage is formed between the first port and the third port of the three-way electromagnetic valve 17, and the first port is communicated with the second port when the three-way electromagnetic valve is electrified.

Further, the humidity balance unit 18 employs a Nafion tube. The Nafion tube is used for ensuring that the gas humidity passing through the electrochemical sensor is the same as the air humidity at each time so as to avoid the influence of the humidity on the detection result and ensure the accuracy of the detection result.

Further, the gas detection unit 20 employs an electrochemical sensor. Electrochemical sensors for checking the concentration of certain gases, such as NO, CO, etc., in the gas passing through the sensor. The molecules of the gas to be detected can generate an electric signal through the electrochemical sensor, and the background signal is deducted, so that the actual response signal of the gas to be detected is obtained.

The utility model discloses a working process does:

(1) the patient holds the exhalation filter (i.e., the mouth exhalation inlet 8) and plugs one of the nostrils with a disposable nasal exhalation head.

(2) And opening the electromagnetic valve II 2, pumping the first pump 5, and pumping the nasal cavity air into the air chamber I3 through the nasal cavity air expiration inlet 1 by the pump I5.

(3) When the expiratory flow in the gas pipeline IV detected by the pressure sensor 10 reaches the set initial pressure, the electromagnetic valve III 11 is opened, the mouth expiration is adjusted to the corresponding flow as required, and the corresponding flow enters the gas chamber II 13 from the mouth expiration inlet through the three-way joint II 12, the electromagnetic valve III 11 and the three-way joint III 12, so that the sampling is completed, and the stop valve I6 and the pump I5 are closed.

(4) After sampling is finished, an analysis stage is entered, wherein the analysis stage comprises an analysis process I and an analysis process II:

in the first analysis process, the second pump 19 and the first electromagnetic valve 7 are firstly opened, and under the action of the second pump 19, the gas in the first air chamber 3 is pushed into the second air chamber 13 to enter the Nafion pipe through the normally-open passage of the first three-way electromagnetic valve 16, and then enters the electrochemical sensor after the humidity balance is carried out in the Nafion pipe. As shown in fig. 3, the horizontal axis represents time (0.2s) and the vertical axis represents response signal value (mA); the first wave is a response curve of mouth expiration, and the response at the peak is a response signal S1 of the first air chamber; the second wave is the response curve of nasal exhalation S2, and the response at the peak is the response signal of air cell two S2. As can be seen from fig. 3, the electrochemical sensor responds to the different signals S1 and S2 at different times to the gases in the different gas chambers, so that the gases in the gas chambers are not mixed and do not interfere with each other.

And in the second analysis process, the electromagnetic valve II 2 and the electromagnetic valve I7 are closed, the three-way electromagnetic valve I16 is opened, air enters the filter 17 under the action of the pump II 19 and enters the Nafion pipe through a switching passage of the filter 17 and the three-way electromagnetic valve I16, the air enters the electrochemical sensor after humidity balance is carried out in the Nafion pipe, and the electrochemical sensor responds to all gas in the air to generate a background signal S0.

And closing all pump valves after all analysis is finished, subtracting all background response signals S0 in the air from the response signals S of the gas in the gas chamber to obtain the response signals of the gas to be detected, wherein S1-S0 are response signals of mouth expiration, and S2-S0 are response signals of nose expiration. Dividing the response signal by the sensitivity S of the sensor to obtain the concentration of the gas to be detected, (S1-S0)/S is the concentration of the gas to be detected in the breath; (S2-S0)/S is the concentration of the gas to be detected in the nasal exhalations. The sensitivity s of the electrochemical sensor is calibrated by using a standard substance when the electrochemical sensor is delivered from a factory.

Example two

As shown in fig. 2, the second air chamber 13 is connected in parallel with the third air chamber 21. In this embodiment, the third electromagnetic valve 11 is a three-way electromagnetic valve, and the three-way electromagnetic valve is a two-way electromagnetic valve. A three-way electromagnetic valve III is arranged on a gas pipeline between the air chamber II 13 and the three-way joint IV 14; the first port of the three-way electromagnetic valve II is connected with the second port of the three-way joint II, the second port of the three-way joint II is connected with the first port of the three-way joint III, and the three-port of the three-way electromagnetic valve II is connected with the third port of the three-way electromagnetic valve III through the air chamber III; and a port I of the three-way electromagnetic valve III is connected with an outlet of the air chamber II, and a port II of the three-way electromagnetic valve III is respectively connected with an inlet of the stop valve II and a port I of the three-way electromagnetic valve I. The other steps are the same as those of the first embodiment.

In this embodiment, the oral exhalation sampling process in the sampling phase is: when the flow reaches a preset flow, the mouth exhalation enters from the mouth exhalation inlet, and then enters the air chamber II through the three-way joint II, the passage I of the three-way electromagnetic valve II (at the moment, the three-way electromagnetic valve II is not electrified) and the three-way joint III; when the pressure sensor detects that the expiratory flow in the gas pipeline IV reaches the preset flow II, the oral expiration enters from the oral expiration inlet and enters into the gas chamber III through the three-way joint II and the passage II of the three-way electromagnetic valve II (at the moment, the three-way electromagnetic valve II is electrified). When the three-way electromagnetic valve II is not electrified, the three-way joint II is connected with the air chamber II through the three-way electromagnetic valve II; when the three-way electromagnetic valve II is electrified, the three-way joint II is connected with the air chamber III through the three-way electromagnetic valve II.

Unlike the embodiment, the analysis process in the analysis phase becomes:

the second pump 19 is firstly opened, the second three-way electromagnetic valve and the third three-way electromagnetic valve 22 are opened, under the action of the second pump 19, the gas in the third air chamber 21 enters the Nafion pipe through the normally-open passage of the third three-way electromagnetic valve 22, the gas is subjected to humidity balance in the Nafion pipe and then enters the electrochemical sensor, and the electrochemical sensor responds to the gas in the second air chamber 13 to generate different signals S3. The gas in the first air chamber 3 is pushed into the second air chamber 13 through a normally open passage of the three-way electromagnetic valve 16 and then enters the Nafion pipe, the Nafion pipe is subjected to humidity balance and then enters the electrochemical sensor, and the electrochemical sensor responds to different signals S1 and S2 to the gas in different air chambers at different time.

The other processes are unchanged.

The above-mentioned embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and those skilled in the art should also be able to make various modifications and improvements (such as adding more air chambers) to the technical solution of the present invention without departing from the design spirit of the present invention, and all such modifications and improvements are intended to fall within the scope of the present invention as defined in the appended claims.

Claims

1. The utility model provides a multichannel gas detector which characterized in that: comprises a nasal expiration inlet, an oral expiration inlet, a first air chamber and a second air chamber;

the nasal exhalation inlet is connected with an inlet of the first air chamber through a first gas pipeline, and an outlet of the first air chamber is respectively connected with a second gas pipeline and a third gas pipeline; a first pump and a first stop valve are arranged on the second gas pipeline; a first electromagnetic valve is arranged on the third gas pipeline; the port I of the first electromagnetic valve is connected with the outlet of the first air chamber, and the port II of the first electromagnetic valve is connected with the inlet of the second air chamber;

2. The multi-pass gas detector of claim 1, wherein: and a second electromagnetic valve is arranged on the first gas pipeline.

3. The multi-pass gas detector of claim 1, wherein: an outlet of the first air chamber is connected with a second air pipeline and a third air pipeline through a first tee joint; the first port of the first tee joint is connected with the outlet of the second air chamber, the second port of the first tee joint is connected with the inlet of the first pump, and the third port of the first tee joint is connected with the first port of the first electromagnetic valve; and the outlet of the first pump is connected with the inlet of the first stop valve.

4. The multi-pass gas detector of claim 1, wherein: the gas pipeline IV is provided with a tee joint II, a pressure sensor and a solenoid valve III; the first port of the three-way joint II is connected with an exhalation inlet, the second port of the three-way joint II is connected with the first port of the electromagnetic valve III, and the third port of the three-way joint II is connected with the input end of the pressure sensor; the port II of the electromagnetic valve I is connected with the inlet of the air chamber II through the tee joint II; and a port I of the three-way joint is connected with a port II of the electromagnetic valve III, the port II is connected with an inlet of the air chamber II, and the port III is connected with a port II of the electromagnetic valve I.

5. The multi-pass gas detector of claim 4, wherein: an outlet of the air chamber II is connected with a gas pipeline V and a gas pipeline VI through a tee joint IV; a first three-way electromagnetic valve is arranged on the gas pipeline VI; a port I of the three-way joint is connected with an outlet of the air chamber II, a port II of the three-way joint is connected with an inlet of the stop valve II, and a port III of the three-way joint is connected with a port I of the three-way electromagnetic valve I; a port II of the first three-way electromagnetic valve is connected with a gas pipeline VII, a filter is arranged on the gas pipeline VII, and the port II of the first three-way electromagnetic valve is connected with an inlet of the filter; and the third port of the first three-way electromagnetic valve is connected with the inlet of the humidity balancing unit, the outlet of the humidity balancing unit is connected with the inlet of the second pump, and the outlet of the second pump is connected with the inlet of the gas detection unit.

6. The multi-pass gas detector of claim 1 or 5, wherein: the humidity balance unit adopts a Nafion pipe.

7. The multi-pass gas detector of claim 1 or 5, wherein: the gas detection unit adopts an electrochemical sensor.

8. The multi-pass gas detector of claim 5, wherein: the electromagnetic valve III is a three-way electromagnetic valve, and the three-way electromagnetic valve is a three-way electromagnetic valve II; a three-way electromagnetic valve III is arranged on a gas pipeline between the air chamber II and the three-way joint IV; the first port of the three-way electromagnetic valve II is connected with the second port of the three-way joint II, the second port of the three-way joint II is connected with the first port of the three-way joint III, and the three-port of the three-way electromagnetic valve II is connected with the third port of the three-way electromagnetic valve III through the air chamber III; and a port I of the three-way electromagnetic valve III is connected with an outlet of the air chamber II, and a port II of the three-way electromagnetic valve III is respectively connected with an inlet of the stop valve II and a port I of the three-way electromagnetic valve I.