CN1348741A - Portable intelligent dynamic cardiograph - Google Patents
Portable intelligent dynamic cardiograph Download PDFInfo
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- CN1348741A CN1348741A CN01140561A CN01140561A CN1348741A CN 1348741 A CN1348741 A CN 1348741A CN 01140561 A CN01140561 A CN 01140561A CN 01140561 A CN01140561 A CN 01140561A CN 1348741 A CN1348741 A CN 1348741A
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- amplifier
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- capacitor
- circuit
- electrocardiosignal
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims description 27
- 230000003321 amplification Effects 0.000 claims description 14
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 14
- 238000001914 filtration Methods 0.000 claims description 6
- 241001269238 Data Species 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 208000008376 Pre-Excitation Syndromes Diseases 0.000 description 1
- 206010040639 Sick sinus syndrome Diseases 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 206010003119 arrhythmia Diseases 0.000 description 1
- 230000006793 arrhythmia Effects 0.000 description 1
- 239000002327 cardiovascular agent Substances 0.000 description 1
- 229940125692 cardiovascular agent Drugs 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000003748 differential diagnosis Methods 0.000 description 1
- 208000002173 dizziness Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 208000019622 heart disease Diseases 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 208000031225 myocardial ischemia Diseases 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 208000024891 symptom Diseases 0.000 description 1
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Abstract
The present invention discloses a portable inelligent type dynamic electro cardiograph, the three channel cardio electric signal is sent to differential amplify circuit through cardio electric lead, after amplifiying, it poasses low channel filter circuit to eliminate interference of high frequency, then send to cophased amplify circuit and amplity to the range suitable for A/D conversion, then the cardioelectric signal is sent to single chip machine to proceed A/D conversion and storage the cardioelectric data in flash storage card. Advantages good anti-interference property, common mode rejection ratio reach 110 dB, high reliability, low power consumption, small volume etc.
Description
Technical field
The present invention relates to a kind of portable intelligent dynamic cardiograph.
Background technology
(Dynamic Electrocardiograph DCG), claims the Holter monitor again to dynamic cardiograph, utilizes portable miniature monitor that electrocardiosignal is noted, and carries out analyzing and processing through the high-speed playback system again, printout ecg wave form and data.Dynamic cardiograph is mainly used in the characteristic and the quantitative analysis diagnosis of arrhythmia and myocardial ischemia, also can be applicable to the Differential Diagnosis of cardiopalmus, fuzzy symptom such as dizzy, detecting of heart disease such as sick sinus syndrome, preexcitation syndrome, the evaluation of cardiovascular drugs curative effect and the evaluation of pacemaker function etc.In addition, in medical research and teaching, also there is wide model to use.
The dynamic cardiograph that with the tape is recording medium is progressively eliminated because volume and power are all big, and the portable dynamic electrocardiograph of import at present generally adopts flash card as recording medium.The above flash card of 64MB all can satisfy the record requirement of 24 hours electrocardiogram (ECG) datas.Adopt the dynamic cardiograph volume of flash card and power consumption as compared with the past be that the dynamic cardiograph of recording medium is much smaller with the tape, but still too big.The purpose of this invention is to provide a kind of microminiature, super low-power consumption, high performance portable intelligent dynamic cardiograph.
Summary of the invention
The purpose of this invention is to provide a kind of portable intelligent dynamic cardiograph.
Square frame circuit of the present invention is to filter High-frequency Interference by low-pass filter circuit after the careful electric conductance connection of triple channel electrocardiosignal is delivered to the differential amplifier circuit amplification, deliver to the final stage in-phase amplification circuit again and be amplified to the amplitude range that is fit to the A/D conversion, electrocardiosignal input single-chip microcomputer carries out the A/D conversion and deposits electrocardiogram (ECG) data in flash card then.
To be electrocardiosignal deliver to differential amplifier circuit and amplify useful electrocardiosignal and suppress common mode disturbances via the triple channel line that leads physical circuit of the present invention, forms first, second and third passage difference amplifier by amplifier and resistance; Electrocardiosignal after difference is amplified is sent into subordinate's active low-pass filter circuit and is carried out filtering, forms first, second and third passage active low-pass filter by amplifier, electric capacity and resistance; Filtered electrocardiosignal is level in-phase amplification circuit after block capacitor C102, C202, C302 are coupled to respectively, forms first, second and third passage final stage in-phase amplifier by amplifier, electric capacity and resistance; The A/D input pin A3, A4, the A5 that deliver to single-chip microcomputer through the electrocardiosignal of final stage homophase amplification carry out analog digital conversion; Amplifier U4:D, capacitor C 1 and resistance R 1, R2 form reference voltage; The P1 mouth of single-chip microcomputer U5 links to each other with the data port of flash card U6, the P2 mouth of single-chip microcomputer U5 and A0, the A1 of flash card U6, A2 ,-OE ,-WE ,-CE1 links to each other with-RST, and the P2.7 of single-chip microcomputer U5 connects LED light, and R6 is a current-limiting resistance; Integrated package U7, capacitor C 5, inductance L 1 and diode D1 form supply convertor, and C9 and C10 are power filtering capacitor, and Schottky diode D2, D3 and capacitor C 6, C7 form booster circuit, and R3, C2, R9, C8 form decoupling circuit.
Advantage of the present invention: good in anti-interference performance, common mode rejection ratio reaches 110dB, surpasses imported product; The reliability height except that analog amplify circuit and power circuit, comprises that all digital processings of A/D and control circuit are all by the chip microcontroller of a slice technical grade; Low in energy consumption, but battery charge one week of continuous operation once; Volume is little, has only 75 * 50 * 17 (mm3), is that half of similar imported product is also little.
Description of drawings
Fig. 1 is the portable intelligent dynamic cardiograph frame circuit diagram;
Fig. 2 is the portable intelligent dynamic cardiograph circuit theory diagrams.
The specific embodiment
Adopt low price, high-performance, super low power consuming single chip processor to realize data acquisition and control; The running voltage of main power consumption parts flash card and single-chip microcomputer is set at 3.3 volts of low pressure, and is operated in intermittently state, make power consumption be pulse type, greatly reduce mean power by scm software control flash card and single-chip microcomputer; The running voltage of the analog circuits such as difference amplification that power consumption is minimum is designed to 6.5 volts, to guarantee enough big common-mode voltage input range, improves capacity of resisting disturbance; Rationally select components and parts for use, well-designed circuit board reduces the circuit board size, improves signal to noise ratio; Select the rectangle battery of 47 * 17 * 6 (mm3) for use, with battery and circuit board be installed in side by side flash card following, make full use of the space and realize microminiature.
As shown in Figure 1, the triple channel electrocardiosignal is delivered to the useful electrocardiosignal of differential amplifier circuit amplification, is suppressed common mode disturbances through leading; Low-pass filter circuit filters High-frequency Interference and prevents that the A/D sampling from producing spectrum confusion; The final stage in-phase amplification circuit is amplified to the amplitude range that is fit to the A/D conversion with electrocardiosignal, and provides low output resistance to satisfy the requirement of A/D conversion accuracy; Single-chip microcomputer carries out the A/D conversion and deposits electrocardiogram (ECG) data in flash card, monitoring cell voltage and control LED demonstration and analysis button order etc. electrocardiosignal; The 64MB flash card is used to write down 24 hours electrocardiogram (ECG) datas; 1.2 the volt rechargeable battery provides electric energy, but once charges one week of continuous operation; The DC/DC changer is raised to 3.3 volts with 1.2 volts of cell voltages single-chip microcomputer and flash card is provided; Booster circuit is raised to 3.3 volts of voltages 6.5 volts again for analog circuits such as difference amplifiers.
As shown in Figure 2, electrocardiosignal is delivered to differential amplifier circuit and is amplified useful electrocardiosignal and suppress common mode disturbances via lead line Ch1-, Ch1, Ch2-, Ch2, Ch3-, Ch3 and ECG G D of triple channel.Amplifier U1:A and resistance R 101, R102, R103, R104 form the first passage difference amplifier; Amplifier U2:A and resistance R 201, R202, R203, R204 form the second channel difference amplifier; Amplifier U3:A and resistance R 301, R302, R303, R304 form the third channel difference amplifier.The supply voltage Avcc1 of amplifier U1, U2 and U3 is 6.5 volts.The supply voltage that improves amplifier U1, U2 and U3 is in order to enlarge difference amplifier common-mode voltage input range, to improve capacity of resisting disturbance.
Electrocardiosignal after difference is amplified is sent into subordinate's active low-pass filter circuit and is carried out filtering.Amplifier U1:B, capacitor C 101 and resistance R 105, R106, R107 form the first passage active low-pass filter; Amplifier U2:B, capacitor C 201 and resistance R 205, R206, R207 form the second channel active low-pass filter; Amplifier U3:B, capacitor C 301 and resistance R 305, R306, R307 form the third channel active low-pass filter.Filtered electrocardiosignal is level in-phase amplification circuit after block capacitor C102, C202, C302 are coupled to respectively.Amplifier U4:A, capacitor C 103 and resistance R 108, R109, R110, R111 form first passage final stage in-phase amplifier; Amplifier U4:B, capacitor C 203 and resistance R 208, R209, R210, R211 form second channel final stage in-phase amplifier; Amplifier U4:C, capacitor C 303 and resistance R 308, R309, R310, R311 form third channel final stage in-phase amplifier.
The A/D input pin A3, A4, the A5 that deliver to single-chip microcomputer through the electrocardiosignal of final stage homophase amplification carry out analog digital conversion.Amplifier U4:D, capacitor C 1 and resistance R 1, R2 form 1.25 volts of reference voltages, for first, second and third passage final stage in-phase amplifier provides reference voltage, make the electrocardiosignal amplitude of giving the A/D conversion within the scope of given 0-2.5 volt.
U5 is a single-chip microcomputer, built-in 12 A/D of this single-chip microcomputer, circuit modules such as 1KB RAM, 32KB Flash Memory.The running voltage of single-chip microcomputer is 1.8 volts-3.6 volts, and standby current is 0.1uA, maximum operating currenbt 0.7mA, and the A/D switching rate can reach 100KHz.U6 is a flash card.Single-chip microcomputer P1 mouth (P1.0, P1.1, P1.2, P1.3, P1.4, P1.5, P1.6, P1.7) links to each other with flash card data port (D0, D1, D2, D3, D4, D5, D6, D7); Single-chip microcomputer P2 mouth (P2.0, P2.1, P2.2) links to each other with flash card address wire (A0, A1, A2); The P2.3 of single-chip microcomputer P2 mouth allows end-OE1 to link to each other with flash card output, and P2.4 writes with flash card and allows end-WE to link to each other, and P2.5 links to each other with flash memory card choosing end-OE, and P2.6 links to each other with flash card reset terminal-RST; P2.7 connects LED light, and R6 is a current-limiting resistance.
Electrocardiosignal after the amplification is that 8 bit digital quantity pre-exist among the RAM in the single-chip microcomputer through Chip Microcomputer A/D sample conversion, writes flash card fast with the burst writing mode after being filled with 512 bytes.Simultaneously, single-chip microcomputer continues to gather electrocardiogram (ECG) data, prepares next 512 byte datas.The single channel sample frequency is 128Hz, and the triple channel total data is 128 * 3=384 (bytes/sec.).
In order to improve the signal to noise ratio of electrocardiograph, will simulate ground and digitally separately strict, particularly single-chip simulation ground AGND and digitally DGND, analog power AVCC and digital power DVCC all need reasonable line arrangement.Integrated package U7, capacitor C 5, inductance L 1 and diode D1 form supply convertor among Fig. 2, export 3.3 volts of VCC and directly supply with flash card, and meet filter capacitor C9 and C10 at the power import place of flash card.VCC supplies with the Avcc of U5 single-chip microcomputers through the DVcc of resistance R 4 supply U5 single-chip microcomputers through resistance R 3.Schottky diode D2, D3 and capacitor C 6, C7 form booster circuit, obtain 6.5 volts AVcc1 and supply with differential amplifier circuit among Fig. 2.AVcc1 obtains the back level in-phase amplification circuit among about 5.5 volts Avcc2 supply figure after decoupling circuit R9, C8 filtering.
Claims (5)
1. portable intelligent dynamic cardiograph, it is characterized in that: the careful electric conductance connection of triple channel electrocardiosignal is delivered to and is filtered High-frequency Interference by low-pass filter circuit after differential amplifier circuit amplifies, deliver to the final stage in-phase amplification circuit again and be amplified to the amplitude range that is fit to the A/D conversion, electrocardiosignal input single-chip microcomputer carries out the A/D conversion and deposits electrocardiogram (ECG) data in flash card then.
2. the dynamic electrograph instrument of portable digital according to claim 1, it is characterized in that: electrocardiosignal is delivered to differential amplifier circuit and is amplified useful electrocardiosignal and suppress common mode disturbances via the triple channel line that leads, and forms first, second and third passage difference amplifier by amplifier and resistance; Electrocardiosignal after difference is amplified is sent into subordinate's active low-pass filter circuit and is carried out filtering, forms first, second and third passage active low-pass filter by amplifier, electric capacity and resistance; Filtered electrocardiosignal is level in-phase amplification circuit after block capacitor C102, C202, C302 are coupled to respectively, forms first, second and third passage final stage in-phase amplifier by amplifier, electric capacity and resistance; The A/D input pin A3, A4, the A5 that deliver to single-chip microcomputer through the electrocardiosignal of final stage homophase amplification carry out analog digital conversion; Amplifier U4:D, capacitor C 1 and resistance R 1, R2 form reference voltage; The P1 mouth of single-chip microcomputer U5 links to each other with the data port of flash card U6, the P2 mouth of single-chip microcomputer U5 and A0, the A1 of flash card U6, A2 ,-OE ,-WE ,-CE1 links to each other with-RST, and the P2.7 of single-chip microcomputer U5 connects LED light, and R6 is a current-limiting resistance; Integrated package U7, capacitor C 5, inductance L 1 and diode D1 form supply convertor, and C9 and C10 are power filtering capacitor, and Schottky diode D2, D3 and capacitor C 6, C7 form booster circuit, and R3, C2, R9, C8 form decoupling circuit.
3. portable intelligent dynamic cardiograph according to claim 1 and 2 is characterized in that: amplifier U1:A and resistance R 101, R102, R103, R104 form the first passage difference amplifier; Amplifier U2:A and resistance R 201, R202, R203, R204 form the second channel difference amplifier; Amplifier U3:A and resistance R 301, R302, R303, R304 form the third channel difference amplifier.
4. portable intelligent dynamic cardiograph according to claim 1 and 2 is characterized in that: amplifier U1:B, capacitor C 101 and resistance R 105, R106, R107 form the first passage active low-pass filter; Amplifier U2:B, capacitor C 201 and resistance R 205, R206, R207 form the second channel active low-pass filter; Amplifier U3:B, capacitor C 301 and resistance R 305, R306, R307 form the third channel active low-pass filter.
5. portable intelligent dynamic cardiograph according to claim 1 and 2 is characterized in that: amplifier U4:A, capacitor C 103 and resistance R 108, R109, R110, R111 form first passage final stage in-phase amplifier; Amplifier U4:B, capacitor C 203 and resistance R 208, R209, R210, R211 form second channel final stage in-phase amplifier; Amplifier U4:C, capacitor C 303 and resistance R 308, R309, R310, R311 form third channel final stage in-phase amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01140561A CN1348741A (en) | 2001-11-06 | 2001-11-06 | Portable intelligent dynamic cardiograph |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01140561A CN1348741A (en) | 2001-11-06 | 2001-11-06 | Portable intelligent dynamic cardiograph |
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| CN1348741A true CN1348741A (en) | 2002-05-15 |
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| CN01140561A Pending CN1348741A (en) | 2001-11-06 | 2001-11-06 | Portable intelligent dynamic cardiograph |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100389720C (en) * | 2004-10-12 | 2008-05-28 | 戴路 | Portable analyzer of electrocardiogram in 12 tracks |
| CN102274011A (en) * | 2011-05-26 | 2011-12-14 | 罗倩倩 | Monitoring device for recovery of severed limbs |
| CN103054594A (en) * | 2012-12-12 | 2013-04-24 | 上海奕瑞光电子科技有限公司 | Automatic trigger exposure circuit of flat panel detector |
-
2001
- 2001-11-06 CN CN01140561A patent/CN1348741A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100389720C (en) * | 2004-10-12 | 2008-05-28 | 戴路 | Portable analyzer of electrocardiogram in 12 tracks |
| CN102274011A (en) * | 2011-05-26 | 2011-12-14 | 罗倩倩 | Monitoring device for recovery of severed limbs |
| CN103054594A (en) * | 2012-12-12 | 2013-04-24 | 上海奕瑞光电子科技有限公司 | Automatic trigger exposure circuit of flat panel detector |
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Owner name: ZHEJIANG ZHEDA WANGXIN TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: ZHEJIANG UNIVERSITY Effective date: 20050513 |
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Effective date of registration: 20050513 Address after: 12, C building, block 310007, World Trade Center, Hangzhou, Zhejiang Applicant after: Zhejiang Zheda Wangxin Sci-Tech Co., Ltd. Address before: Hangzhou City, Zhejiang province 310027 Xihu District Ancient Jade Road 20 Applicant before: Zhejiang University |
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