CN104143250A - Sound alarm module based on single-chip microcomputer and applied to infusion device and method for generating alarm sounds - Google Patents
Sound alarm module based on single-chip microcomputer and applied to infusion device and method for generating alarm sounds Download PDFInfo
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- CN104143250A CN104143250A CN201310172867.0A CN201310172867A CN104143250A CN 104143250 A CN104143250 A CN 104143250A CN 201310172867 A CN201310172867 A CN 201310172867A CN 104143250 A CN104143250 A CN 104143250A
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Abstract
The invention discloses a sound alarm module based on a single-chip microcomputer and applied to an infusion device. The sound alarm module based on the single-chip microcomputer and applied to the infusion device comprises the single-chip microcomputer AT89C52, a digital-to-analogue conversion module DAC0832, an amplifier LM386 and a buzzer, wherein the single-chip microcomputer AT89C52, the digital-to-analogue conversion module DAC0832, the amplifier LM386 and the buzzer are connected in sequence through signals. A method for generating alarm sounds based on the sound alarm module comprises the following steps that (1) an alarm sound signal is designed according to the national standard YY0709-2009, (2) a simulated signal is simulated by means of the single-chip microcomputer AT89C52 and the digital-to-analogue conversion module DAC0832, (3) the simulated signal is amplified by means of the amplifier, so that the buzzer is driven to make alarm sounds. According to the sound alarm module based on the single-chip microcomputer and applied to the infusion device and the method for generating the alarm sounds, the single-chip microcomputer AT89C52 is taken as the control part of a central control unit, the DAC0832 is selected to serve as the D/A module to convert the digital quantity output by a control system into the corresponding analog quantity, the audio frequency amplifier LM386 is adopted to serve as the peripheral module to amplify the output of the D/A module, so that the buzzer is driven to make the alarm sound signals, in this way, the new industrial standard of acoustic alarm signals is met, standardization of the alarm sounds of the infusion device is achieved, and the infusion device can operate more safely and more reliably.
Description
Technical field
The present invention relates to scm observe and control technology, particularly relate to a kind of SCM Based transfusion device audible alarm module and alarm sound production method.
Background technology
Warning system in medicine equipment can be reminded medical care and health personnel in time, and deterioration has appearred in conditions of patients, or apartment warning operating personnel, and operation may be dangerous.Warning system comprises the warning functions such as sound, optics and word prompting, for passing in time apparatus status and patient's change of illness state.Warning system perfect, reliably and effectively for guaranteeing that medical safety is significant.Audible alert signal is useful to space orientation, can help operator promptly to determine the source of alarm condition.
Transfusion device is a kind ofly can accurately control number of infusion drops or infusion flow rate, guarantees that medicine is can speed even, and dose accurately and enter safely a kind of instrument playing a role in patient body.Each malfunction in transfusion device can being used according to Risk Analysis Methods for Medical Devices is divided into high, medium and low grade, comprise bubble warning, drip number warning, pressure alarm, obstruction warning, aneroid warning, battery low-voltage warning, processor warning etc., main vision and the audio alarm mode of adopting, prompting medical personnel's timely processing.The audible alert signal of current domestic medical product adopts piezoelectricity warning device cheaply, cannot meet complex frequency requirement in standard, the alarm sound of other medical equipments is obscured easily and in clinical setting, therefore the understanding of normalized signal and realization have certain clinical value and meaning.The audible alert signal of external medical product has adopted microcontroller circuit to produce the electric signal of combination of frequency, and converts the audible alert signal that meets standard clause to.
Summary of the invention
Object of the present invention, exactly in order to address the above problem, provides a kind of SCM Based transfusion device audible alarm module.
To achieve these goals, the present invention has adopted following technical scheme: a kind of SCM Based transfusion device audible alarm module, comprises single chip computer AT 89C52, D/A converter module DAC0832, amplifier LM386 and hummer; The output of single chip computer AT 89C52 connects the input of D/A converter module DAC0832, and the output of D/A converter module DAC0832 connects the input of amplifier LM386, and the output of amplifier LM386 connects hummer.
Alarm sound production method based on tut alarm module, comprises the following steps:
One, according to national standard YY0709-2009 design alarm sound signal;
Two, utilize single chip computer AT 89C52 and D/A converter module DAC0832 analog simulation signal;
Three, using amplifier LM386 to amplify simulate signal drives hummer to send alarm sound.
The specific practice of step 1 is, the different audible alert signal of high priority, medium priority and the low priority of formulating according to national standard YY0709-2009, the musical note of making the transfusion device alarm sound signal of high priority, medium priority and low priority combines and pulse train design proposal.
The specific practice of step 2 is that 89C52 is as central control unit for use single chip computer AT, by D/A converter module DAC0832, the digital quantity of central control unit output is converted to corresponding analog quantity, realizes corresponding alert audio signal and produces; Utilize the Timer/Counter of single-chip microcomputer to produce different frequency square-wave signal corresponding to scale of respectively reporting to the police; According to the audible alert signal pulse parameter values of setting, with DAC0832, simulate, 3 square-wave pulse counters accumulation square wave number of rising edge, maximal value and the negative edge of corresponding trapezoidal sound wave pulse is respectively set, and calculates three stage contained accumulation square wave numbers of each sound in each priority.
The specific practice of step 3 is that the low level audio current signal that uses amplifier LM386 amplification and conversion D/A converter module DAC0832 to export, makes output power be enough to drive the hummer connecting to send alarm sound.
The invention provides a SCM Based transfusion device audible alarm module and the alarm sound production method based on this module, meet the industry requirement under audible alert signal complicated in pharmaceuticals industry national standard YY0709-2009.The audible alarm scheme that the present invention proposes, has realized 3 classification standards of transfusion device alarm sound, makes that actual transfusion device work is more easy, safety and reliable.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of SCM Based transfusion device audible alarm module of the present invention;
Fig. 2 is the temporal characteristics diagram of audible alert signal;
Fig. 3 is audible alert signal main program flow chart;
Fig. 4 is audible alert signal sounding subroutine flow chart.
Embodiment
Referring to Fig. 1, the present invention is based on the transfusion device audible alarm module of single-chip microcomputer, comprise single-chip microcomputer 1, D/A converter module 2, amplifier 3 and hummer 4.Single-chip microcomputer adopts AT89C52, D/A converter module to adopt DAC0832, amplifier to adopt LM386; The output of single chip computer AT 89C52 connects the input of D/A converter module DAC0832, and the output of D/A converter module DAC0832 connects the input of amplifier LM386, and the output of amplifier LM386 connects hummer.
The alarm sound production method that the present invention is based on tut alarm module, comprises the following steps:
One, according to national standard YY0709-2009 design alarm sound signal;
Two, utilize single chip computer AT 89C52 and D/A converter module DAC0832 analog simulation signal;
Three, using amplifier LM386 to amplify simulate signal drives hummer to send alarm sound.
In step 1, the different audible alert signal of high priority, medium priority and the low priority of formulating according to national standard YY0709-2009, the musical note of making the transfusion device alarm sound signal of high priority, medium priority and low priority combines and pulse train design proposal.According to national standard YY0709-2009, require to have a set of different audible alert signal with high priority, medium priority, low priority at least, guarantee that user can select the auditory alarm system of a set of that know, standard in all warning systems.It is all different from other sound of great majority (as facsimile recorder sound, phone sound etc.) that the audible alert signal of high priority is designed to, alerting signal is wanted priority encoding, so that operator only obtains alerting signal in the sound by sense of hearing Jiu Ke patient care district, and tell the priority of associated alarm states.Main difference of indicating priority by quantity and the rhythm and pace of moving things of pulse in pulse train, the feature of audible alert signal pulse is as shown in table 1.
The feature of table 1 audible alert signal pulse
High priority pulse train is comprised of 10 pulses, and 5 pulses are one group, has a time-out between every group.The first group pulse causes operator's attention, and the second group pulse will be emphasized the importance of alarm condition, and helps operator to determine the source of alarm condition.The pulse train of medium priority is comprised of 3 pulses, and the pulse train of low priority is comprised of 1 to 2 pulse.Compare with low priority alerting signal, high priority alerting signal should be used pulse train faster, and pulse is shorter, and repetition frequency is higher.Medium priority and low priority audible alert signal should at least complete a pulse train, and high priority audible alert signal should at least complete half pulse train.Pulse train meets the variation shown in Fig. 2 in time domain.Different pulse train patterns, pulse train speed, pulse width, repetition rate and the relative volume etc. of basic, normal, high priority alerting signal, produce the different urgency levels that need operator to respond.Audible alert signal should attempt using tone patterns (musical note) standardization, can represent with one group of following note: C is corresponding to middle pitch DO, and d is corresponding to the bass re than the low octave of middle pitch RE, and same g is corresponding to the bass sol than the low octave of middle pitch SOL.Sound can produce the gradual rolloff of fluid and the effect of " splashing " overflow, and the pre-tone of audible alert signal and a kind of note thereof represent as shown in table 2.
The pre-tone of table 2 audible alert signal and a kind of note thereof represent
Around the alerting signal of 3 different brackets, the difference (referring to table 1) of indicating priority by quantity and the rhythm and pace of moving things of pulse in pulse train.By different pulse train patterns, pulse train speed, pulse width, repetition rate and the relative volume etc. of basic, normal, high priority alerting signal are set, produce the different urgency levels that need operator to respond.
In step 2, use single chip computer AT 89C52 as central control unit, by D/A converter module DAC0832, the digital quantity of central control unit output is converted to corresponding analog quantity, realize corresponding alert audio signal and produce; Utilize the Timer/Counter of single-chip microcomputer to produce different frequency square-wave signal corresponding to scale of respectively reporting to the police; According to the audible alert signal pulse parameter values of setting, with DAC0832, simulate, 3 square-wave pulse counters accumulation square wave number of rising edge, maximal value and the negative edge of corresponding trapezoidal sound wave pulse is respectively set, and calculates three stage contained accumulation square wave numbers of each sound in each priority.More particularly, be that employing AT89C52 and DAC0832 are generated to needed audio pulse, realize trapezoidal audio alarm acoustic impluse signal.Produce a certain specific tonepulse (1/ frequency) and be about to this recurrence interval divided by 2, be the time of semiperiod, utilize the time of this semiperiod of timer timing, whenever timing is to rear just anti-phase by the I/O of output pulse, then reclock time of this semiperiod is anti-phase to I/O again, just can on I/O pin, obtain the pulse of this frequency.Utilize the timer internal of single-chip microcomputer that it is operated under 16 digit counter pattern MODE1, change count value THO and TLO to produce the pulse signal of different frequency.The computing formula of the timer counting initial value of the note of a certain characteristic frequency is as follows:
The counting initial value of some warning notes pulse that can be regarded as out the transfusion device of GB regulation according to formula (1), is listed in table 3.
Table 3 alerting signal timer counting initial value
DAC0832 is 8 D/As of monolithic direct current output type that adopt CMOS technique to make, the audible alert signal pulse parameter values that simulation sets, 3 square-wave pulse counter count1 need be set, count2, the accumulation square wave number of the rising edge of the corresponding sound wave pulse of count3 difference, maximal value, negative edge.The sound wave pulse of different frequency, at identical rising time, maximal value time and negative edge in the time contained square-wave pulse number be different.Therefore need calculate three contained accumulation square waves of stage of each sound in each priority, count counti (i=1,2,3).Formula is as follows:
count
1＝2N
r-1；count
2＝2(N
r+N
d)-1count
3＝2(N
r+N
d+N
f)-1 (3)
In formula (2), r, d, f be corresponding rising edge, maximal value and negative edge respectively.
The accumulation square wave in note pulse each period of different priorities is counted result of calculation and is summarized in table 4.
The accumulation square wave number in note pulse each period of table 4 different priorities
The present invention adopts 3 switch k1, k2, k3 simulation to send the alert event of 3 grades, selects AT89C52 single-chip microcomputer as control module, uses DAC0832 chip directly to realize 8 bit data transmission and digital-to-analog conversions.The software section of C language compilation is realized the emulation of 3 grade transfusion device audible alert signal.The parameter of each software and hardware of initialization, the state of 3 buttons of master routine cycle detection, proceeds to corresponding warning subroutine action sounding.Warning subroutine is carried out initialization setting and opens interruption timer T0 and timer T1, carries out timing.Adopt timer T1 to carry out gating pulse group's generation, timer T0 interrupt response realizes each stage pulse square wave counting.The time of a pulse train is controlled and directly by timer T0, is controlled, and need to define delay function and reach the pulse train several seconds even more durations of interval.
AT89C52 single-chip microcomputer is as key control unit, and as shown in Figure 3, alerting signal sounding subroutine flow chart as shown in Figure 4 for the audible alert signal main program flow chart of the C language compilation of the emulation of 3 grade transfusion device audible alert signal.First define setting, comprise 3 switch Input Address of (1) definition simulation different priorities signal; (2) substrate frequency is set, middle pitch DO, bass re, bass sol; (3) the correlated count storage unit of timer T0 and T1; (4) the pronunciation music score of definition different priorities.Master routine completes (1) initialization, and the zero clearing of counting storage unit, arranges timer priority, switch interrupts; (2) enter while statement, the state of 3 switches of cycle detection, has low level input once a certain port be detected, and program proceeds to corresponding interruption subroutine action sounding.
Alerting signal sounding subroutine is sounding program, and first (1), according to table 3,4 setting, carries out initialization setting and opens interruption timer T0 and timer T1, carries out timing; (2) program adopts timer T1 to carry out gating pulse group's generation, uses a while circulation that subroutine is remained where one is, and waiting timer T1 finishes the work, then returns to master routine.A zone bit timel is set and realizes the control that T1 returns subroutine.Wherein use delay procedure to complete the pulse train time interval of interval (it is even more generally to be several seconds), and the control of the time of a pulse train is directly controlled by timer T0.The direct-connected DAC0832 chip of single-chip microcomputer realizes 8 bit data transmission and single buffering working method completes digital-to-analog conversion.
In step 3, use amplifier LM386 to amplify and change the low level audio current signal of D/A converter module DAC0832 output, make output power be enough to drive the hummer connecting to send alarm sound.LM386 is a kind of audio frequency integrated amplifier, has the power amplifier of the advantages such as oneself power consumption is low, gain capable of regulating, supply voltage scope is large, outward element is few and total harmonic distortion is little, is mainly used in low-voltage consumer product.Between 2 pin and 3 pin, meet adjustable resistance 10K Ω, between 1 pin and 8 pin, access electric capacity and resistance, regulation voltage gain (maximum 200).7 pin external bypass capacitor filtering noise reductions.Input end is with status reference, and output terminal is arrived half of supply voltage by automatic bias simultaneously, and under 6V supply voltage, its quiescent dissipation is only 24mW, makes LM386 be specially adapted to battery powered occasion.
The operating process of simulation alarm condition is as follows:
1, when K1 continues to press, send out 10 sound DO re sol-DO re-DO re sol-DO re, after time delay 5s, continue to send this group sound, switch disconnects, stop alarm after current sound sounding finishes.
2, after K1 presses, disconnect immediately, system can stop after 5 the sound DO re sol-DO re that report to the police.
3, when a K2 continues to press (or disconnecting immediately after pressing), sends out 3 sound DO re sol, after time delay 10s, continues to send this group sound, and switch disconnects, stop alarm after this group sound sounding finishes.If K1 presses between time delay, no matter whether K2 continues the state that maintenance is pressed, conditional response when system all only can be pressed according to K1.
4, when a K3 continues to press (or disconnecting immediately after pressing), sends out 2 sound DO DO, after time delay 15s, continues to send this group sound, and switch disconnects, stop alarm after this group sound sounding finishes.If K1 or K2 press between time delay, no matter whether K3 continues the state that maintenance is pressed, conditional response when system all only can be pressed according to K1 or K2.If K1, K2 press between time delay, no matter whether K3 continues the state that maintenance is pressed, conditional response when system all only can be pressed according to K1.
Claims (5)
1. a SCM Based transfusion device audible alarm module, is characterized in that: comprise single chip computer AT 89C52, D/A converter module DAC0832, amplifier LM386 and hummer; The output of single chip computer AT 89C52 connects the input of D/A converter module DAC0832, and the output of D/A converter module DAC0832 connects the input of amplifier LM386, and the output of amplifier LM386 connects hummer.
2. the alarm sound production method based on audible alarm module claimed in claim 1, is characterized in that comprising the following steps:
One, according to national standard YY0709-2009 design alarm sound signal;
Two, utilize single chip computer AT 89C52 and D/A converter module DAC0832 analog simulation signal;
Three, using amplifier LM386 to amplify simulate signal drives hummer to send alarm sound.
3. alarm sound production method as claimed in claim 2, it is characterized in that: the specific practice of step 1 is, the different audible alert signal of high priority, medium priority and the low priority of formulating according to national standard YY0709-2009, the musical note of making the transfusion device alarm sound signal of high priority, medium priority and low priority combines and pulse train design proposal.
4. alarm sound production method as claimed in claim 2, it is characterized in that: the specific practice of step 2 is, use single chip computer AT 89C52 as central control unit, by D/A converter module DAC0832, the digital quantity of central control unit output is converted to corresponding analog quantity, realizes corresponding alert audio signal and produce; Utilize the Timer/Counter of single-chip microcomputer to produce different frequency square-wave signal corresponding to scale of respectively reporting to the police; According to the audible alert signal pulse parameter values of setting, with DAC0832, simulate, 3 square-wave pulse counters accumulation square wave number of rising edge, maximal value and the negative edge of corresponding trapezoidal sound wave pulse is respectively set, and calculates three stage contained accumulation square wave numbers of each sound in each priority.
5. alarm sound production method as claimed in claim 2, it is characterized in that: the specific practice of step 3 is, use amplifier LM386 to amplify and change the low level audio current signal of D/A converter module DAC0832 output, make output power be enough to drive the hummer connecting to send alarm sound.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104548259A (en) * | 2015-01-15 | 2015-04-29 | 深圳市科曼医疗设备有限公司 | Alarming method of injection pump and injection pump |
| CN105446219A (en) * | 2015-12-18 | 2016-03-30 | 上海力申科学仪器有限公司 | Medical infusion pump alarming sound power amplifier power supply intelligent control system |
| CN105582605A (en) * | 2015-12-28 | 2016-05-18 | 湖南明康中锦医疗科技发展有限公司 | Medical device alarm method and device and breathing machine |
| CN106075650A (en) * | 2016-06-03 | 2016-11-09 | 罗学技 | A kind of infusion alarm and the alarming method of infusion alarm |
| CN108010537A (en) * | 2017-12-30 | 2018-05-08 | 长沙迪普美医疗科技有限公司 | A kind of audible alarm processing method, device, system |
| CN114078311A (en) * | 2021-11-18 | 2022-02-22 | 东劢医疗科技(苏州)有限公司 | Medical equipment auditory alarm test system and method |
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| CN109658671A (en) * | 2018-12-13 | 2019-04-19 | 中国电子科技集团公司第四十研究所 | A kind of medical electrical equipment auditory alarm system and method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104548259A (en) * | 2015-01-15 | 2015-04-29 | 深圳市科曼医疗设备有限公司 | Alarming method of injection pump and injection pump |
| CN105446219A (en) * | 2015-12-18 | 2016-03-30 | 上海力申科学仪器有限公司 | Medical infusion pump alarming sound power amplifier power supply intelligent control system |
| CN105582605A (en) * | 2015-12-28 | 2016-05-18 | 湖南明康中锦医疗科技发展有限公司 | Medical device alarm method and device and breathing machine |
| CN105582605B (en) * | 2015-12-28 | 2018-07-06 | 湖南明康中锦医疗科技发展有限公司 | Medical Devices alarm method, device and lung ventilator |
| CN106075650A (en) * | 2016-06-03 | 2016-11-09 | 罗学技 | A kind of infusion alarm and the alarming method of infusion alarm |
| CN108010537A (en) * | 2017-12-30 | 2018-05-08 | 长沙迪普美医疗科技有限公司 | A kind of audible alarm processing method, device, system |
| CN114078311A (en) * | 2021-11-18 | 2022-02-22 | 东劢医疗科技(苏州)有限公司 | Medical equipment auditory alarm test system and method |
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