CN214781852U

CN214781852U - System for be used for air tubercle bacillus to detect

Info

Publication number: CN214781852U
Application number: CN202120735783.3U
Authority: CN
Inventors: 王灿; 马金标; 杜漫漫
Original assignee: Tianjin University
Current assignee: Tianjin University
Priority date: 2021-04-12
Filing date: 2021-04-12
Publication date: 2021-11-19
Anticipated expiration: 2031-04-12

Abstract

The utility model provides a system for air tubercle bacillus detects, including condensing equipment, peristaltic pump, diverter valve, micro-fluidic chip that loop through the pipeline intercommunication and with micro-fluidic chip electric connection's signal display device, a system for air tubercle bacillus detects with collection, sample preparation of expired air, micro-fluidic multichannel advances kind, biological reaction and sensor detection integration, detect timely feedback through real-time signal, can simplify complicated analysis scheme and reduce the sample size, detection time and reagent cost can detect a plurality of samples in succession simultaneously, have improved air tubercle bacillus detection efficiency and outdoor operation's portability, are expected to play a role in the preliminary examination in tubercle hotspot area.

Description

System for be used for air tubercle bacillus to detect

Technical Field

The utility model belongs to the environmental monitoring field especially relates to a system for air tubercle bacillus detects.

Background

Airborne respiratory infections frequently occur and are rapidly and widely spread worldwide. Among them, tuberculosis has a high morbidity and mortality rate, and is a chronic infectious disease mainly transmitted through the respiratory tract. China is one of three countries with the highest burden in the world, 83.3 thousands of new tuberculosis cases exist in 2019, and 33,000 tuberculosis deaths occur. And 360 million tuberculosis patients are missed by the sanitation system every year. Worse yet, the modeling and analysis of the world health organization indicates that the pandemic of new coronary pneumonia seriously undermines public health services. During the period of 2020 to 2025, it may cause 630 million new cases of tuberculosis worldwide. Therefore, tuberculosis remains a not negligible public health problem.

Rapid and accurate detection is the basis for tuberculosis control. Bacteriological tests account for 80% of tuberculosis diagnoses. Tuberculosis is mostly transmitted from person to person by carrying a droplet or aerosol of mycobacterium tuberculosis. However, tubercle bacillus has strong resistance to severe environments and can survive in the air for a long time. At present, the conventional detection methods of the tubercle bacillus mainly comprise a culture method, imaging detection, sputum smear microscopy, tuberculin sensitivity test, serological detection, molecular diagnosis and the like. Most of these techniques are complex, time consuming, sensitive and operationally demanding, thus limiting their use outside the laboratory. In addition, the concentration of tubercle bacillus in the air is extremely low and impurities can cause interference, and the tubercle bacillus is difficult to effectively detect.

Various sensors have been developed for a wide range of fields. Its applicability in the detection of mycobacterium tuberculosis still faces many challenges. One of the challenges is that most of samples detected by the current sensors are liquid samples, and direct collection of air samples for detection is rare. Another is that sensor detection is often performed by drip methods, which makes sample loading and handling difficult to control. This method is susceptible to interference from external physical factors (e.g., light, humidity and temperature), resulting in inaccurate measurements and poor sensing stability. Microfluidic technology integrates sample preparation, reagent manipulation, biological reactions and detection steps into a unique platform, simplifying complex analysis protocols and reducing sample size, detection time and reagent costs. In order to improve the detection efficiency of the biosensor and the portability of outdoor operations, it is required to simultaneously detect a plurality of samples or a plurality of target microorganisms to improve the practicality and flexibility. Therefore, a new method for rapidly detecting mycobacterium tuberculosis aerium is needed in the art.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a system for air tubercle bacillus detects to realize sampling gas, detect a plurality of samples simultaneously in succession, simplify complicated analysis scheme and reduce sample size, check-out time and reagent cost.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

a system for detecting mycobacterium tuberculosis air comprises a condensing device, a peristaltic pump, a switching valve, a micro-fluidic chip and a signal display device which is electrically connected with the micro-fluidic chip which are sequentially communicated through a pipeline,

the condensing device is used for condensing the exhaled breath into a liquid sample,

the peristaltic pump is used for conveying the liquid sample to the microfluidic chip through the switching valve,

the micro-fluidic chip is used for sending the detection signal to the signal display device.

Preferably, condensing equipment includes the insulation can, locates the condensation box in the insulation can and fills in the condensate solution of insulation can between the condensation box, condensation box both ends are equipped with air inlet and gas outlet, and crisscross a plurality of guide plates that are provided with about being in the condensation box, and condensation box bottom is equipped with gathers the mouth.

Preferably, the bottom of the condensation box is provided with a flow guide wall for guiding the liquid sample to the collection port.

Preferably, the microfluidic chip comprises a shell, a sensor packaged in the shell and a plurality of external round tubes arranged on the shell, wherein a liquid flow channel shaped like a Chinese character 'mi' is arranged in the shell, and the external round tubes are communicated with the liquid flow channel.

Preferably, the width of the liquid flow channel is 0.5 mm.

Preferably, the sensor is a silicon nanowire field effect transistor sensor.

Preferably, a plurality of check valves are provided in the switching valve.

Preferably, the signal display device includes a display and a signal processing module.

Compared with the prior art, the system for detecting the mycobacterium tuberculosis in air has the following advantages:

(1) the system for detecting the air tubercle bacillus collects the exhaled air, prepares samples, carries out microfluidic multichannel sampling, integrates biological reaction and sensor detection, and feeds back in time through real-time signal detection;

(2) the system for detecting the mycobacterium tuberculosis in air can simplify a complex analysis scheme and reduce the sample amount, the detection time and the reagent cost;

(3) a system for air tubercle bacillus detects can detect a plurality of samples simultaneously in succession, improved air tubercle bacillus detection efficiency and outdoor operations's portability, be expected to play a role in the preliminary examination in tuberculosis hot spot area.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

FIG. 1 is a schematic structural diagram of a system for detecting Mycobacterium tuberculosis in air according to an embodiment of the present invention;

FIG. 2 is a graph showing the normalized response of the detection of the simulated exhaled breath of Mycobacterium tuberculosis according to the embodiment of the present invention.

Description of reference numerals:

1. a condensing unit; 11. a condensing box; 12. an air inlet; 13. an air outlet; 14. a baffle; 15. a flow guide wall; 16. a collection port; 17. condensing the salt solution; 18. a heat preservation box body; 2. a peristaltic pump; 3. a switching valve; 31. a one-way valve; 4. a microfluidic chip; 41. a housing; 42. a sensor; 43. a liquid flow passage; 44. an external round pipe; 5. and a signal display device.

Detailed Description

Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which this invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.

The present invention will be described in detail with reference to the following embodiments and accompanying drawings.

As shown in figure 1, the system for detecting mycobacterium tuberculosis air of the utility model comprises a condensing unit 1, a peristaltic pump 2, a switching valve 3, a micro-fluidic chip 4 and a signal display device 5 which is electrically connected with the micro-fluidic chip 4 which are sequentially communicated through a pipeline,

the condensation device 1 is used for condensing exhaled breath into a liquid sample,

the peristaltic pump 2 is used to deliver a liquid sample to the microfluidic chip 4 through the switching valve 3,

the micro-fluidic chip 4 generates a detection signal under the action of the liquid sample and sends the detection signal to the signal display device 5.

Preferably, the condensing device 1 comprises a heat preservation box 18, a condensation box 11 arranged in the heat preservation box 18 and a condensate solution 17 filled between the heat preservation box 18 and the condensation box 11, wherein the two ends of the condensation box 11 are provided with an air inlet 12 and an air outlet 13, a plurality of guide plates 14 are arranged in the condensation box 11 in a left-right staggered manner, one end of each guide plate 14 is fixedly connected with the condensation box 11, a gap for air to pass through is reserved between the other end of each guide plate and the side wall of the condensation box 11, the guide plates 14 are arranged in a left-right staggered manner, the air moves forwards along an S-shaped route in the condensation box 11, the bottom of the condensation box 11 is provided with a guide wall 15 for guiding the liquid sample to the collection port 16, the bottom of the condensation box 11 is provided with a collection port 16, the air is condensed into the liquid sample under the cooling effect of the condensate solution 17 in the forward movement process in the condensation box 11 and is attached to the guide plates 14 or the guide wall 15, flows downwards along the diversion plate 14 or the diversion wall 15, is collected at the bottom of the condensation box 11 and is discharged from the collection port 16.

The preparation steps of the microfluidic chip 4 are as follows: firstly, the sensor 42 is packaged with the shell 41 through ultraviolet curable UV glue, the shell 41 is made of PMMA plastic, ultraviolet light is irradiated for 5min for curing, the sensor 42 used in the embodiment is a silicon nanowire field effect tube sensor, then the whole liquid path system is connected, an external round tube 44 is communicated with a liquid flow channel 43 in the shell 41, the liquid flow channel 43 is in a shape of a Chinese character mi, the width of the liquid flow channel is 0.5mm, the external round tube 44 and the end point of the liquid flow channel 43 are correspondingly distributed in a shape of Chinese character mi, the external round tube 44 in the embodiment is provided with 8, 7 of the external round tube are liquid inlets, 1 is a liquid outlet, liquid samples to be detected can enter from different liquid inlets in sequence, the sensor triggers the sensor to detect the liquid samples to be detected, the liquid samples are finally discharged from the liquid outlets, and a plurality of samples can be detected simultaneously.

When the device is used, the condensing device 1, the peristaltic pump 2, the switching valve 3 and the microfluidic chip 4 are sequentially communicated through a pipeline, the switching valve 3 is provided with 1 liquid inlet and 7 one-way valves 31 respectively communicated with the liquid inlet, a sample obtained by the peristaltic pump 2 can be selectively sucked into a liquid flow channel to ensure that a liquid path does not return, the one-way valves 31 are correspondingly communicated with the 7 liquid inlets on the microfluidic chip 4 one by one, the microfluidic chip 4 is connected with a signal display device 5, the signal display device 5 used in the embodiment is a Keithley 2400 semiconductor parameter analyzer, the embodiment uses tubercle simulant tubercle bacillus secretion protein to volatilize aerosol, volatilized gas enters the gas inlet 12 through the pipeline, moves forwards along the gas flow channel in the condensing device 1 until the volatilized gas is discharged from the gas outlet 13, the volatilized gas is condensed into a liquid sample under the action of the condensing device 1 and is collected at the bottom of the condensing box 11, at the moment, the switching valve 3 and the signal display device 5 are opened, the peristaltic pump 2 is started, the liquid sample is injected into the microfluidic chip 4, the flow rate of the peristaltic pump is 0.3ml/min, a signal processing module in the signal display device 5 reads and processes an electrochemical signal generated by the sensor 42 and displays the electrochemical signal on a display, a constant voltage of 0.5V is added between a source electrode and a drain electrode of the sensor 42 in the detection process, and the target current is monitored in real time in the whole process. The normalized current response result is shown in fig. 2, which proves that the system for detecting the mycobacterium tuberculosis air can rapidly detect the mycobacterium tuberculosis air.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A system for detection of mycobacterium tuberculosis air, comprising: comprises a condensing device, a peristaltic pump, a switching valve, a micro-fluidic chip and a signal display device which is electrically connected with the micro-fluidic chip, wherein the condensing device, the peristaltic pump, the switching valve and the micro-fluidic chip are sequentially communicated through a pipeline,

2. The system for mycobacterium tuberculosis air detection of claim 1, wherein: condensing equipment includes the insulation can, locates the condensation box in the insulation can and fills in the condensate solution of insulation can between the condensation box, condensation box both ends are equipped with air inlet and gas outlet, and crisscross a plurality of guide plates that are provided with about being in the condensation box, and condensation box bottom is equipped with gathers the mouth.

3. The system for mycobacterium tuberculosis air detection of claim 2, wherein: and a flow guide wall for guiding the liquid sample to the collection port is arranged at the bottom of the condensation box.

4. The system for mycobacterium tuberculosis air detection of claim 1, wherein: the micro-fluidic chip comprises a shell, a sensor packaged in the shell and a plurality of external round tubes arranged on the shell, wherein a liquid flow passage in a shape like a Chinese character mi is arranged in the shell, and the external round tubes are communicated with the liquid flow passage.

5. The system for mycobacterium tuberculosis air detection of claim 4, wherein: the width of the liquid flow channel is 0.5 mm.

6. The system for mycobacterium tuberculosis air detection of claim 4, wherein: the sensor is a silicon nanowire field effect transistor sensor.

7. The system for mycobacterium tuberculosis air detection of claim 1, wherein: a plurality of one-way valves are arranged in the switching valve.

8. The system for mycobacterium tuberculosis air detection of claim 1, wherein: the signal display device comprises a display and a signal processing module.