CN104075777A - Flow sensor automatic measuring system in anesthesia machine - Google Patents
Flow sensor automatic measuring system in anesthesia machine Download PDFInfo
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- CN104075777A CN104075777A CN201310109060.2A CN201310109060A CN104075777A CN 104075777 A CN104075777 A CN 104075777A CN 201310109060 A CN201310109060 A CN 201310109060A CN 104075777 A CN104075777 A CN 104075777A
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Abstract
The invention discloses a flow sensor automatic measuring system in an anesthesia machine. The flow sensor automatic measuring system applicable to the field of medical apparatus comprises a gas source, a flow adjusting circuit, a proportional valve, a to-be-measured flow sensor, a signal conditioning circuit and a data collecting and processing circuit. The gas source is connected with the proportional valve. The to-be-measured flow sensor measures air flows passing the proportional valve and outputs flow measuring values. The data collecting and processing circuit transmits N different signals to the flow adjusting circuit. The flow adjusting circuit adjust the openness of the proportional valve according to the N signals. The data collecting and processing circuit sequentially acquires the N flow measuring values, corresponding to the N signals, of the to-be-measured sensor to generate a to-be-measured sensor flow measuring value group and compares the difference between flow measuring value group and a flow theoretical value group to determine whether the flow sensor is qualified or not. By the system, automatic flow control is achieved, short measuring time is achieved, and time-consuming manual sensor measuring is avoided.
Description
Technical field
The present invention relates to field of medical, relate in particular to the automatic measurement system of flow sensor in a kind of Anesthesia machine.
Background technology
Along with growth in the living standard, people focused on the health of self more in recent years, and Medical Devices especially large area are employed; Anesthesia machine, as indispensable Medical Devices in operating room and intensive care unit, becomes the main project of many research and development units and company.Anesthesia machine is a kind of can conveying multiple gases and volatile anesthetic, control and assisting patient is breathed, the senior Medical Devices that simultaneously in surgical procedure, patient's consciousness, pain level regulated. its require the oxygen that provides and inhalational anesthetic concentration should be accurately, stablize and easily control.Anesthesia machine is as an important apparatus implementing anesthesia, to ensureing that patients ' lives has safely immeasurable effect.In Anesthesia machine, flow sensor is the critical elements of exhaling flow monitoring to inhaling, and its quality in performance has affected the quality of the performance of Anesthesia machine to a great extent.Yet the flow sensor of selling at present on market is of a great variety, each is variant for the linearity, sensitivity, repeatability, stability, and the research and development initial stage of Anesthesia machine, measurement became an important problem for flow sensor type selecting.At present, the measurement for flow sensor mainly contains two kinds of methods: a kind of is the method that adopts manual measurement; By manual control flow, the magnitude of voltage of survey sensor output, the measurement through a large amount of, draws measurement data, then assesses the quality of sensor.This measuring method, more consuming time, workload is also large, and error is also larger, and record data are also cumbersome.Another kind utilizes data collecting card to measure sensor; By manual control flow, sensor output signal is carried out to suitable conditioning, then by capture card image data, and automatically record save data.This method intelligent, robotization, automatically record measurement data, and error is less.But all there is a deficiency in these two kinds of methods, can not robotization for the control of flow, also need the adjust flux of artificial repeatability.
Summary of the invention
For described technical matters, the present invention proposes a kind of without flow sensor automatic measurement system in the Anesthesia machine of manual control flow.In this system automatic adjustment system, gas flow is big or small, automatically gathers the measured value of flow sensor to be measured, and whether automatic analysis sensing to be measured is qualified.Thoroughly exempted the step of artificial repeated adjust flux, realized the robotization of flow control, Measuring Time is short, work efficiency is high.
Embodiments of the invention disclose the automatic measurement system of the flow sensor in a kind of Anesthesia machine.Comprise source of the gas, flow regulation circuit, proportioning valve, flow sensor, signal conditioning circuit, data acquisition and processing (DAP) circuit to be measured; Flow regulation circuit, proportioning valve, flow sensor, signal conditioning circuit, data acquisition and processing (DAP) circuit to be measured are linked in sequence, data acquisition and processing (DAP) circuit connection traffic regulating circuit; Source of the gas connects proportioning valve, and proportioning valve can be controlled air-flow size by its aperture size, and flow sensor to be measured is measured the air-flow of passing ratio valve, delivery rate measured value; Data acquisition and processing (DAP) circuit is to flow regulation circuit transmission N different control signal, and N is more than or equal to 3 integer, and flow regulation circuit is according to the aperture size of this N Signal Regulation ratio valve; Data acquisition and processing (DAP) circuit obtains N the flow measurements to flow sensor to be measured that should N signal successively by signal conditioning circuit, generate flow sensor flow measurement group to be measured, the difference of more described flow measurements group and flow theory value group, to determine that whether flow sensor is qualified.
Preferably, described data acquisition and processing (DAP) circuit comprises data collecting card and PC: the flow measurements that data collecting card collection signal modulate circuit is carried, and send it to PC; PC completes the analyzing and processing that convection current measures magnitude signal, co-current flow amount regulating circuit transfer control signal.
Preferably, described flow regulation circuit comprises control circuit and driving circuit, and control circuit, according to the signal of PC transmission, produces conditioning signal and this signal is offered to driving circuit, driving circuit amplifies this signal and is sent to proportioning valve, the aperture size of control ratio valve.
Preferably, described control circuit is single-chip microcomputer.
Preferably, between described PC and described single-chip microcomputer, also comprise level shifting circuit, for completing the level conversion between PC and single-chip microcomputer.
Preferably, when described PC transmits signal to described single-chip microcomputer, in the mode of serial communication, transmit.
Preferably, between described single-chip microcomputer and described driving circuit, also comprise A/D convertor circuit, for the digital signal that single-chip microcomputer is produced, be converted to simulating signal.
Preferably, the serial communication between described single-chip microcomputer and PC can be realized based on graphical programming software.
Preferably, described graphical programming software is LabVIEW or Proteus.
Preferably, obtaining of described flow measurements, can take, under 1 control signal of described data acquisition and processing (DAP) unit transmission, to average, using this mean value as the flow measurements under this control signal after multi collect flow measurements.
Preferably, described flow theory value group is pre-stored in described data acquisition and processing (DAP) circuit, described flow theory value group need replace with proving flowmeter by the flow sensor to be measured in automatic measurement system when obtaining, data acquisition and processing (DAP) circuit is to flow regulation circuit transmission N different control signal, N is more than or equal to 3 integer, and flow regulation circuit is according to the aperture size of this N Signal Regulation ratio valve; Data acquisition and processing (DAP) circuit obtains N the flow measurements to proving flowmeter that should N signal successively by signal conditioning circuit, forms flow measurements group, and described flow measurements group is flow theory value group.
Preferably, during the difference of more described flow measurements group and flow theory value group, the square mean error amount of calculated flow rate measurement set and flow theory value group.
Preferably, when whether described definite flow sensor to be measured is qualified, judge the relation between described flow measurements group and the square mean error amount of flow theory value group and the threshold value of a setting, if when described square mean error amount is less than the threshold value of described setting, flow sensor to be measured is qualified; Otherwise, defective.
Preferably, described threshold value is 2%.
Beneficial effect of the present invention is that a kind of flow sensor system of measurement is automatically provided.The benefit of doing like this, has realized the robotization of flow control, has reduced the working time, has improved measuring accuracy.People is separated from the measurement of flow sensor, exempted the work that people spend a large amount of time measurement sensor, greatly improved production efficiency.
Accompanying drawing explanation
According to drawings and embodiments the present invention is described in further detail below.
Fig. 1 is the flow sensor automatic measurement system structural representation described in the embodiment of the present invention;
Fig. 2 is the signal conditioning circuit schematic diagram described in the embodiment of the present invention;
Fig. 3 is the flow regulation circuit diagram described in the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Embodiment mono-
As shown in Figure 1, flow sensor automatic measurement system 100, comprises source of the gas, flow regulation circuit 110, proportioning valve 102, flow sensor 103, signal conditioning circuit 104, data acquisition and processing (DAP) circuit 120 to be measured; Flow regulation circuit 110 consists of driving circuit 111, ADC112 and single-chip microcomputer 113; Data acquisition and processing (DAP) circuit 120 is by data collecting card 121, and PC 122 forms.
On PC 122, select 5 corresponding 5 flow measurements of different control signals, get 5 control signals here and be respectively " 1 ", " 2 ", " 3 ", " 4 " and " 5 ".Single-chip microcomputer 113 is received after described control signal, produces corresponding with it digital regulating signal and is respectively " 0001 ", " 0010 ", " 0011 ", " 0100 " and " 0101 ".Above-mentioned digital regulating signal produces corresponding analog voltage for " 0.4V ", " 0.8V ", " 1.2V ", " 1.6V " and " 2.0V " after changing by ADC112.If PC converts a control signal at set intervals, this interval time T
intervalcan be set as different values according to actual conditions, as 0.1 second, 0.5 second, 1 second, 2 seconds, 5 seconds, 10 seconds etc., the present embodiment was selected T interval time
intervalbe 10 seconds, after 50 seconds, obtain complete flow measurements group.
After test starts, source of the gas passing ratio valve 102 flows into, and first PC 122 produces first control signal " 1 ", by the LabVIEW environment on PC 122, can in the mode of serial communication, use RS232 serial ports to transfer out described control signal.Described control signal, by RS232-TTL level transferring chip, for example, after MAX232101, inputs in single-chip microcomputer 113.After single-chip microcomputer 113 is received RS232-TTL switching signal corresponding to control signal " 1 ", output digital regulating signal " 0001 ", above-mentioned digital regulating signal is by after DAC112, and for example DAC0832, is converted to the rear input driving circuit 111 of analog regulation signal " 0.4V " by digital regulating signal.As shown in Figure 2, the amplifier that wave filter, RC and the operational amplifier that driving circuit 111 consists of RC forms and R and metal-oxide-semiconductor MOS circuit are composed in series.By this driving circuit 111, reach the effect of flowing through the electric current of proportioning valve 102 by the Control of Voltage of ADC112 output, by controls, flow through the aperture that the size of current of proportioning valve 102 can control ratio valve 102 big or small.When the voltage of ADC112 output is " 0.4V ", proportioning valve 102 maintains an aperture size, and can reserve the gas of firm discharge p.s..Flow sensor 103 to be measured is measured above-mentioned flow value and this is worth to the formal output with voltage, outputs to signal conditioning circuit 104.As shown in Figure 3, the filtering circuit that signal conditioning circuit 104 consists of resistance R and capacitor C, operational amplifier, OP2992 for example, it is in series that the voltage follower forming and operational amplifier and resistance R, capacitor C form the wave filter that proportional amplifier and resistance R and capacitor C form in the same way, its feeble signal for the treatment of 103 outputs of measurement of discharge sensor is carried out filtering and amplifies after processing, outputs in data collecting card 121.What this data collecting card 121 was used is NI data collecting card.NI data acquisition is stuck in after control signal generation, wait for a period of time and start to gather, the setting of waiting time is because proportioning valve 102 changes after aperture, air-flow reaches steady state (SS) needs a period of time, the data that record in order to ensure flow sensor 103 to be measured are stable values, need to arrange certain stand-by period.Waiting time T
wait forgenerally be made as control signal T interval time
interval1/5th,
in the present embodiment, the stand-by period is 2 seconds, and the acquisition rate of NI capture card is set:
inferior/second
In the present embodiment, frequency acquisition is 0.5 time/second, it starts to gather after control signal produces 2 seconds, in 10 seconds, gather altogether 4 signals, average, the flow measurements that controlled signal " 1 " is corresponding, data collecting card 121 is sent to PC 122 by the voltage signal collecting, the described magnitude of voltage of PC 122 storage.According to upper type, PC 122 successively obtains the flow measurements of the to be measured flow sensor 103 corresponding with 5 mutually different control signals to generate flow measurements group.
The difference of more described flow measurements group and flow theory value group, to determine that whether flow sensor is qualified.The method of obtaining flow theory value group is the position of flow sensor 103 to be measured to be replaced and determined with a proving flowmeter and in the present embodiment, get N=5 here by the number N of flow theory value in flow theory value group.Then according to as obtained the same steps of flow measurements group, just can obtain corresponding flow theory value group.This flow theory value group is to measure in advance and leave in PC.According to different test needs, pre-stored flow theory value group can be varied, and it needs only the corresponding identical PC control signal group of flow measurements group with follow-up true measurement.
The square mean error amount that PC 122 calculates between described flow measurements group and flow theory value group.As shown in table 1 below is the correlation data of flow measurements group and flow theory value group.
Table 1
| PC control signal | Flow theory value | Flow measurements |
| 1 | 2.64 | 2.71 |
| 2 | 4.38 | 4.29 |
| 3 | 6.12 | 6.14 |
| 4 | 7.86 | 7.88 |
| 5 | 9.60 | 9.64 |
Calculate the square mean error amount of two groups of data:
Making threshold value is 2%, and described flow sensor to be measured 103 is qualified.
Described is only preferred embodiment of the present invention and institute's application technology principle, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses, and the variation that can expect easily or replacement, all should be encompassed in protection scope of the present invention.
Claims (14)
1. an automatic measurement system for the flow sensor in Anesthesia machine, is characterized in that, comprises source of the gas, flow regulation circuit, proportioning valve, flow sensor, signal conditioning circuit, data acquisition and processing (DAP) circuit to be measured; Flow regulation circuit, proportioning valve, flow sensor, signal conditioning circuit, data acquisition and processing (DAP) circuit to be measured are linked in sequence, data acquisition and processing (DAP) circuit connection traffic regulating circuit; Source of the gas connects proportioning valve, and proportioning valve can be controlled air-flow size by its aperture size, and flow sensor to be measured is measured the air-flow of passing ratio valve, delivery rate measured value; Data acquisition and processing (DAP) circuit is to flow regulation circuit transmission N different control signal, and N is more than or equal to 3 integer, and flow regulation circuit is according to the aperture size of this N Signal Regulation ratio valve; Data acquisition and processing (DAP) circuit obtains N the flow measurements to flow sensor to be measured that should N signal successively by signal conditioning circuit, generate flow sensor flow measurement group to be measured, the difference of more described flow measurements group and flow theory value group, to determine that whether flow sensor is qualified.
2. automatic measurement system according to claim 1, is characterized in that, described data acquisition and processing (DAP) circuit comprises data collecting card and PC: the flow measurements that data collecting card collection signal modulate circuit is carried, and send it to PC; PC completes the analyzing and processing that convection current measures magnitude signal, co-current flow amount regulating circuit transfer control signal.
3. automatic measurement system according to claim 2, it is characterized in that, described flow regulation circuit comprises control circuit and driving circuit, control circuit is according to the signal of PC transmission, produce conditioning signal and this signal is offered to driving circuit, driving circuit amplifies this signal and is sent to proportioning valve, the aperture size of control ratio valve.
4. automatic measurement system according to claim 3, is characterized in that, described control circuit is single-chip microcomputer.
5. automatic measurement system according to claim 4, is characterized in that, between described PC and described single-chip microcomputer, also comprises level shifting circuit, for completing the level conversion between PC and single-chip microcomputer.
6. automatic measurement system according to claim 5, is characterized in that, when described PC transmits signal to described single-chip microcomputer, in the mode of serial communication, transmits.
7. automatic measurement system according to claim 4, is characterized in that, between described single-chip microcomputer and described driving circuit, also comprises A/D convertor circuit, for the digital signal that single-chip microcomputer is produced, is converted to simulating signal.
8. automatic measurement system according to claim 6, is characterized in that, the serial communication between described single-chip microcomputer and PC can be realized based on graphical programming software.
9. automatic measurement system according to claim 8, is characterized in that, described graphical programming software is LabVIEW or Proteus.
10. automatic measurement system according to claim 1, it is characterized in that, when described flow measurements is obtained, under 1 control signal of described data acquisition and processing (DAP) unit transmission, after multi collect flow measurements, average, using this mean value as the flow measurements under this control signal.
11. automatic measurement systems according to claim 1, it is characterized in that, described flow theory value group is pre-stored in described data acquisition and processing (DAP) circuit, described flow theory value group need replace with proving flowmeter by the flow sensor to be measured in automatic measurement system when obtaining, data acquisition and processing (DAP) circuit is to flow regulation circuit transmission N different control signal, N is more than or equal to 3 integer, and flow regulation circuit is according to the aperture size of this N Signal Regulation ratio valve; Data acquisition and processing (DAP) circuit obtains N the flow measurements to proving flowmeter that should N signal successively by signal conditioning circuit, forms flow measurements group, and described flow measurements group is flow theory value group.
12. automatic measurement systems according to claim 1, is characterized in that, during the difference of more described flow measurements group and flow theory value group, and the square mean error amount of calculated flow rate measurement set and flow theory value group.
13. automatic measurement systems according to claim 11, it is characterized in that, when whether described definite flow sensor to be measured is qualified, judge the relation between described flow measurements group and the square mean error amount of flow theory value group and the threshold value of a setting, when if described square mean error amount is less than the threshold value of described setting, flow sensor to be measured is qualified; Otherwise, defective.
14. automatic measurement systems according to claim 10, is characterized in that, described threshold value is 2%.
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| CN201310109060.2A CN104075777A (en) | 2013-03-29 | 2013-03-29 | Flow sensor automatic measuring system in anesthesia machine |
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| CN201310109060.2A CN104075777A (en) | 2013-03-29 | 2013-03-29 | Flow sensor automatic measuring system in anesthesia machine |
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| CN106860995A (en) * | 2015-12-14 | 2017-06-20 | 北京谊安医疗***股份有限公司 | A kind of method for being not required to the automatic calibration flow sensor of independent external gas source |
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Application publication date: 20141001 |