CN205411181U - Mainstream formula people breathes flow and synchronous monitoring devices of carbon dioxide concentration - Google Patents
Mainstream formula people breathes flow and synchronous monitoring devices of carbon dioxide concentration Download PDFInfo
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- CN205411181U CN205411181U CN201520717139.8U CN201520717139U CN205411181U CN 205411181 U CN205411181 U CN 205411181U CN 201520717139 U CN201520717139 U CN 201520717139U CN 205411181 U CN205411181 U CN 205411181U
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Abstract
The utility model discloses a mainstream formula people breathes flow and synchronous monitoring devices of carbon dioxide concentration: form by host computer, monitoring module and breathing pipeline, the host computer is general purpose computer or monitor, monitoring module includes differential pressure formula baroceptor, infrared light source and binary channels infrared sensor triplex, breathing the pipeline middle part and being equipped with two pressure ports, differential pressure formula baroceptor is placed in between two pressure ports breathing the pipeline, breathes pipeline middle part top and is equipped with convex throttling arrangement, and the throttling arrangement below is the monitoring window, and infrared light source and binary channels infrared sensor place monitoring window both sides in. The utility model discloses can swiftly, stably, accurately realize breathing the monitoring of flow and carbon dioxide concentration to the people.
Description
Technical field
This utility model belongs to biomedical engineering field, relates to a kind of main stream-type people's respiratory flow and gas concentration lwevel synchronous monitoring device.
Background technology
People's respiratory flow and gas concentration lwevel monitor the most important effect that serves in medical monitoring in real time.Along with medical science and technology and the development of correlation theory, respiratory flow and gas concentration lwevel detection technique quickly grow, detection method also gets more and more.The detection method of respiratory flow can be divided into indirect method and direct method.Indirect detection method is to breathe, by detection, some additional phenomena produced, and extracts respiratory flow signal.Direct Detection Method mainly includes bionical Micro-Robot method and pressure flow sensor method, and wherein pressure flow sensor method becomes the focus of research at present owing to measuring accurately and realize relatively simple.Relative to indirect method, direct method can improve accuracy of detection, it is achieved the real-time detection to respiratory flow.Gas concentration lwevel monitoring mode can be divided into main stream-type and side stream type.Relative to side stream type, main stream-type has fast response time, real-time monitoring and other advantages.Although there being at present minority main stream-type monitoring of respiration equipment to achieve breath stream monitoring, but owing to the interference of respiratory air flow makes monitoring result error relatively big, and there is the problems such as output signal is weak.
Utility model content
In order to solve problems of the prior art, this utility model provides a kind of main stream-type people's respiratory flow and gas concentration lwevel synchronous monitoring device, overcomes the problem that in prior art, main stream-type monitoring of respiration parameter is more single, measurement error is big.
The technical solution of the utility model is:
A kind of main stream-type people's respiratory flow and gas concentration lwevel synchronous monitoring device, by host computer, monitoring modular and corrugated hose composition, described host computer is general purpose computer or monitor, described monitoring modular includes differential pressure type baroceptor, infrared light supply and four-way infrared sensor three part, two pressure ports it are provided with in the middle part of described corrugated hose, differential pressure type baroceptor is placed between two pressure ports of corrugated hose, the throttling arrangement protruded it is arranged in the middle part of corrugated hose, for monitoring window below throttling arrangement, infrared light supply and dual pathways infrared sensor are placed in monitoring window both sides.
Described corrugated hose divides air inlet, interlude and gas outlet three part, described air inlet and gas outlet to be cylindrical structural, and interlude is rectangular structure, and described throttling arrangement is rectangular structure, and right angle walls is rounded corner.
A kind of main stream-type people's respiratory flow and gas concentration lwevel synchronous monitoring method, first whole system is carried out the warm that powers on, 1 minute preheating time, a stable excitation is provided to differential pressure type baroceptor by microcontroller, microcontroller can provide different excitations, in order to find optimal differential pressure type baroceptor excitation, experimental result can be surveyed by providing different excitations, then the method for mathematical statistics is used to determine Optimum Excitation by the output of differential pressure type baroceptor in the case of relatively different excitations, selection differences coefficient CV determines, it is the best that the excitation of the least representative sensor of CV value selects；Microcontroller is by controlling the modulated signal that light source scintillation makes the dual channel sensor output cycle fix simultaneously, starts analog-to-digital conversion device when this modulated signal voltage reaches crest or trough and obtains infrared sensor Measurement channel voltage Dc, infrared sensor reference channel voltage Dr, and send signal to host computer process.
Described method includes that respiratory flow monitoring and gas concentration lwevel monitor two parts, and step is as follows:
(1) gathering the voltage data of the output of 30 seconds in the case of not being passed through air-flow, average S to these data0, then it is passed through the air-flow of a certain flow velocity, then gathers data S of 1 minute1,S2,S3……Sn, then pass to the air-flow of different in flow rate, carry out same experiment；
(2) data previous step collected carry out process and carry out second order polynomial fit, first calculate Δ Sn=Sn-S0, calculate the difference under different in flow rate, then these differences and flow velocity demarcated by method of least square, obtain fitting formula Δ S=aX2+ bX+c, wherein a, b, c are parameter determined by calibration experiment, and X is flow velocity；
(3) using this platform to carry out detecting the breathing of people, by gathering the data that people breathes, the difference of the data gathered in the case of calculating and be not passed through air-flow, then the inverse process by demarcating tries to achieve people's respiratory flow；
(4) gas pressure curve, respiratory flow curve are breathed in real time according to breathing result drafting；
(5) breathing carbon dioxide is monitored, utilize Measurement channel voltage peak DhcWith valley DlcDifference extract Measurement channel exchange DacComponent, it may be assumed that Dac=(Dhc-Dlc)/2, in like manner obtain reference channel AC compounent DarComponent；
(6) two channel AC component difference: D are utilizeds=Dac-DarCarry out three rank fitting of a polynomials and determine current breathing carbon dioxide concentration:Wherein p3、p2、p1、p0Parameter determined by calibration experiment；
(7) according to breathing the result real-time breathing carbon dioxide concentration curve of drafting.
The beneficial effects of the utility model are: the main stream-type people's respiratory flow that the utility model proposes and gas concentration lwevel synchronous monitoring device and method realize direct respiratory flow and gas concentration lwevel on corrugated hose to patient and monitor in real time, and patient vital signs situation and relevant information can be analyzed from respiratory flow and gas concentration lwevel waveform, provide information guiding accurately and reliably to doctor.
Accompanying drawing explanation
Fig. 1 main stream-type respiratory flow and gas concentration lwevel synchronous monitoring device structural representation；
Fig. 2 this utility model respiratory flow and gas concentration lwevel monitoring method flow chart；
Fig. 3 main stream-type respiratory flow and gas concentration lwevel monitoring device respiratory circuit schematic diagram；
Wherein: 1-pressure port；2-throttling arrangement；3-rounded corner；4-air inlet；5-gas outlet；6-monitors window.
Detailed description of the invention
Below in conjunction with the accompanying drawings this utility model is described in further detail.
Main stream-type respiratory flow of the present utility model and gas concentration lwevel monitoring device are made up of host computer, monitoring modular and corrugated hose.Host computer is general purpose computer or monitor.Monitoring modular includes differential pressure type baroceptor, infrared light supply and four-way infrared sensor three part, as shown in Figure 1, in corrugated hose, respiratory air flow enters pipeline from air inlet 4, differential pressure type pressure sensor module is placed between two pressure ports 1, when air-flow runs into throttling arrangement 2, a pressure reduction fall can be produced before and after throttling arrangement, can be tried to achieve by the pressure that two pressure ports 1 obtain, last air-flow flows out through gas outlet 5, air-flow is by monitoring window 6 and the air chamber of intermediate conduit composition simultaneously, the light beam sent through light source, carbon dioxide in gas can absorb the light of respective wavelength.According to fluid mechanics principle, the phenomenon of eddy current is produced when air-flow runs into right angle walls, experimental result is had an impact, so in order to avoid the appearance of eddy current, make the right angle walls of throttling arrangement into as shown in fig. 1 rounded corner 3, allow the flow to stable transition, in order to make respiratory flow and gas concentration lwevel synchronous monitoring, monitoring window 6 is placed in below throttling arrangement.Monitoring modular also includes respiratory circuit except corrugated hose, as it is shown on figure 3, mainly have microcontroller circuit, amplifying circuit and serial communication circuit.The output of sensor through bandpass filtering amplifying circuit filter and amplification laggard enter microcontroller circuit process, be sent in host computer be further processed by result finally by serial communication circuit.Finally on host computer, demonstrate people's respiratory flow and gas concentration lwevel waveform.
Wherein, the air inlet of corrugated hose and air outlet parts are cylindrical structurals, and mid portion is rectangular structure.Throttling arrangement and monitoring window are the piths in whole pipe design.Top at the interlude pipeline of corrugated hose, add a throttling arrangement 2 that throttle orifice can be made to diminish as shown in fig. 1, this throttling arrangement and pipeline are one, owing to interlude pipeline is rectangular structure, so this part design becomes a rectangular structure, simultaneously taking account of the breathing of people to be obstructed situation, if the throttle orifice formed is too small, people breathes the difficulty that can become.Right angle walls before and after this throttling arrangement is designed to the form of rounded corner, allows the flow to stable transition.When air-flow is by this throttling arrangement, air-flow velocity can slow down, and forms a pressure reduction fall front and back.Monitoring window 6 is positioned at the lower section of throttling arrangement, and pipeline is also one,
As it is shown on figure 3, the port 1 of pressure transducer is connected with two pressure ports 1 of corrugated hose respectively with port 2, dual pathways infrared sensor and infrared light supply are fixed on monitoring window 6 both sides.
This utility model monitoring device obtains respiratory flow and gas concentration lwevel parameter according to the following procedure:
First whole system is carried out the warm that powers on, 1 minute preheating time, a stable excitation is provided to pressure transducer by microcontroller, microcontroller can provide different excitations, in order to find optimal pressure transducer excitation, experimental result can be surveyed by providing different excitations, then the method for mathematical statistics is used to determine Optimum Excitation by the output of pressure transducer in the case of relatively different excitations, selection differences coefficient CV determines, it is the best that the excitation of the least representative sensor of CV value selects；Microcontroller is by controlling the modulated signal that light source scintillation makes the dual channel sensor output cycle fix simultaneously, starts analog-to-digital conversion device when this modulated signal voltage reaches crest or trough and obtains infrared sensor Measurement channel voltage Dc, infrared sensor reference channel voltage Dr.And send signal to host computer process.
Respiratory flow is monitored:
(1) gathering the voltage data of the output of 30 seconds in the case of not being passed through air-flow, average S to these data0, then it is passed through the air-flow of a certain flow velocity, then gathers data S of 1 minute1,S2,S3……Sn, then pass to the air-flow of different in flow rate, carry out same experiment；
(2) data previous step collected carry out process and carry out second order polynomial fit, first calculate Δ Sn=Sn-S0, calculate the difference under different in flow rate, then these differences and flow velocity demarcated by method of least square, obtain fitting formula Δ S=aX2+ bX+c, wherein a, b, c are parameter determined by calibration experiment, and X is flow velocity；
(3) using this platform to carry out detecting the breathing of people, by gathering the data that people breathes, the difference of the data gathered in the case of calculating and be not passed through air-flow, then the inverse process by demarcating tries to achieve people's respiratory flow；
(4) gas pressure curve, respiratory flow curve are breathed in real time according to breathing result drafting.
Gas concentration lwevel is monitored:
(5) breathing carbon dioxide is monitored, utilize Measurement channel voltage peak DhcWith valley DlcDifference extract Measurement channel exchange DacComponent, it may be assumed that Dac=(Dhc-Dlc)/2, in like manner obtain reference channel AC compounent DarComponent.
(6) two channel AC component difference: D are utilizeds=Dac-DarCarry out three rank fitting of a polynomials and determine current breathing carbon dioxide concentration:Wherein p3、p2、p1、p0Parameter determined by calibration experiment.
(7) according to breathing the result real-time breathing carbon dioxide concentration curve of drafting.
Although preferred embodiment of the present utility model being described above in conjunction with accompanying drawing; but this utility model is not limited to above-mentioned detailed description of the invention; above-mentioned detailed description of the invention is only schematically; it is not restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; in the case of without departing from this utility model objective and scope of the claimed protection, it is also possible to make a lot of form, within these belong to protection domain of the present utility model.
Claims (2)
1. main stream-type people's respiratory flow and gas concentration lwevel synchronous monitoring device, by host computer, monitoring modular and corrugated hose composition, it is characterized in that, described host computer is general purpose computer or monitor, described monitoring modular includes differential pressure type baroceptor, infrared light supply and dual pathways infrared sensor three part, two pressure ports it are provided with in the middle part of described corrugated hose, differential pressure type baroceptor is placed between two pressure ports of corrugated hose, the throttling arrangement protruded it is arranged in the middle part of corrugated hose, for monitoring window below throttling arrangement, infrared light supply and dual pathways infrared sensor are placed in monitoring window both sides.
The most according to claim 1, main stream-type people respiratory flow and gas concentration lwevel synchronous monitoring device, it is characterised in that described throttling arrangement is rectangular structure, right angle walls is rounded corner.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520717139.8U CN205411181U (en) | 2015-09-15 | 2015-09-15 | Mainstream formula people breathes flow and synchronous monitoring devices of carbon dioxide concentration |
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| CN201520717139.8U CN205411181U (en) | 2015-09-15 | 2015-09-15 | Mainstream formula people breathes flow and synchronous monitoring devices of carbon dioxide concentration |
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| CN205411181U true CN205411181U (en) | 2016-08-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105105750A (en) * | 2015-09-15 | 2015-12-02 | 天津大学 | Main flow type human breathing flow and carbon dioxide concentration simultaneous monitoring device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105105750A (en) * | 2015-09-15 | 2015-12-02 | 天津大学 | Main flow type human breathing flow and carbon dioxide concentration simultaneous monitoring device and method |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160803 Termination date: 20170915 |
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| CF01 | Termination of patent right due to non-payment of annual fee |