CN2664593Y - Body surface electrocardiosignal monitoring circuit - Google Patents
Body surface electrocardiosignal monitoring circuit Download PDFInfo
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- CN2664593Y CN2664593Y CN 200320117538 CN200320117538U CN2664593Y CN 2664593 Y CN2664593 Y CN 2664593Y CN 200320117538 CN200320117538 CN 200320117538 CN 200320117538 U CN200320117538 U CN 200320117538U CN 2664593 Y CN2664593 Y CN 2664593Y
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Abstract
The utility model relates to a circuit for monitoring body surface electrocardiosignals, which comprises a backing stage impedance matching circuit (20), a lead-fail identification circuit (90), a main amplification circuit (40), a drive circuit (30), a voltage amplifying circuit (60) and a low-pass filter circuit (80), wherein the output end Leads out of the lead-fail identification circuit (90) is one output end in all of the circuits, and is in output connection with a microprocessor; the output end of the main amplification circuit (40) is connected to the input end of the voltage amplifying circuit (60), and the output end of the voltage amplifying circuit (60) is connected to the low-pass filter circuit (80); the output ends Vout 0, Vout 1 and Vout 2 of the low-pass filter circuit (80) are another three output ends in all of the circuits, and are in output connection with an A/D converter. The utility model avoids the uniform error of a filter transmission band and gain setting, and decreases the discrepancy among modules, effectively overcomes the interference of power frequency and cleanly, correctly and reliably obtains the electrocardiosignal data.
Description
Technical field this utility model relates to semiconductor device amplifying circuit and RC wave filter, be particularly related at the device that small-signal is carried out suppress when high accuracy is amplified interference noise, relate in particular to the circuit constructive method and the device that are used to monitor body surface ecg.
The situation of background technology prior art: the measuring method of body surface ecg all is to adopt the AgCl electrode that is attached to the body surface ad-hoc location to obtain faint electrocardiosignal, and by cardiac diagnosis lead-line above-mentioned faint electrocardiosignal is sent into electronic amplifier and amplify, obtain the electrocardiosignal of volt level, be converted to digital electrocardiosignal by A/D, can further carry out the feature identification and the calculation of parameter of electrocardiosignal.Because the electrocardiosignal of body surface is the decomposition of the myocardium rhythmicity electricity physiological signal of human heart at body surface, signal is very faint, also is subjected to the interference of power frequency simultaneously, and therefore, obtaining clean, effective electrocardiosignal is the key technology that electrocardiosignal detects.The electronic circuit that present great majority are used for cardiac monitoring is to adopt the meter specially amplifier, the back level adopts the adjustable high pass filter of frequency band, the signal amplifier of Gain Adjustable, circuit units such as low pass filter that frequency band is adjustable and circuit translation are finished the amplification to electrocardiosignal jointly, the circuit structure complexity, it is poor that gain is provided with, passband is provided with concordance.
The summary of the invention technical problem to be solved in the utility model is to propose a kind of circuit that is used to monitor body surface ecg for fear of the deficiencies in the prior art part.This circuit arrangement comprises the prime impedance matching circuit, identification circuit, the main amplifying circuit of coming off leads, drive circuit, high-pass filtering circuit, voltage amplification and level prewired circuit, several parts such as low-pass filtering constitute a modular electrocardiogram monitoring structure, mainly finish the impedance matching of signal input part, the functions such as the amplification of electrocardiosignal of identification automatically, the driving of right lower limb, high and low pass filter, fixed gain and level preset that come off of leading.
This utility model can be realized by following technical scheme:
A kind of circuit that is used to monitor body surface ecg of Design and Machining comprises the prime impedance matching circuit, identification circuit, main amplifying circuit, drive circuit, voltage amplifier circuit and the low-pass filter circuit of coming off leads; Described prime impedance matching circuit comprises right hand passage, left hand passage, left foot passage, chest lead passage and the right lower limb passage that leads that leads that leads that leads; The input of this each passage of circuit connects leading separately, and the operational amplifier in each passage all is connected into the voltage follower form, and the output of each voltage follower all inserts the described input of identification circuit of coming off that leads; Right hand passage, left hand the lead output of channel voltage follower of passage and left foot of leading of leading is connected together by resistance in the described prime impedance matching circuit, insert the input of drive circuit then, the output that right lower limb drives passage in the described drive circuit connects right lower limb and drives and lead, and the output that screen layer drives passage connects the screen layer that leads; Described the come off outfan of identification circuit of leading is an outfan of whole circuit, and microprocessor is received in output, and this outfan is a low level at ordinary times, leads when coming off arbitrary, and this outfan becomes high level; Operational amplifier in the described main amplifying circuit connects and is instrument amplifying circuit form, and its homophase and reverse input end insert passage, left hand lead the different two-way in each voltage follower output of passage and chest lead passage of passage, left foot that lead that lead of the right hand in the prime impedance matching circuit respectively; The outfan of described main amplifying circuit inserts the input of described voltage amplifier circuit, and the output of this circuit connects low-pass filter circuit, and the output of described low-pass filter circuit is three outfans of whole circuit, and A/D converter is received in output.
Described prime impedance matching circuit and be connected to the prime low-pass filter circuit between the right hand leads, left hand leads, left foot leads, chest lead and right lower limb lead, each passage all is made of single order RC low pass filter in this circuit.
Be connected to high-pass filtering circuit between described main amplifying circuit and the voltage amplifier circuit, each passage all is made of single order RC high pass filter in this circuit.
Described voltage amplifier circuit comprises three operational amplifiers, and an input of each operational amplifier also connects the outfan of level prewired circuit separately by resistance except connecing feedback resistance; The stabilizing output level of described level prewired circuit is at+2.5V.
Described prime impedance matching circuit comprises 5 operational amplifiers, and each operational amplifier all is connected into the voltage follower form, all connects a resistance between separately in-phase input end and negative supply.
Described drive circuit comprises two operational amplifiers, and the in-phase input end of an operational amplifier and the inverting input of another operational amplifier connect the junction point of 3 resistance; The output of one operational amplifier connects right lower limb leads, and the output of an operational amplifier connects the screen layer that leads.
The described identification circuit that comes off of leading comprises logic circuit chip, operational amplifier and voltage comparator, the in-phase input end of voltage comparator is connected on the dividing point that is made of resistance, logic circuit chip is connected into the voltage follower form, its input connects the outfan of logic circuit chip, the output of logic circuit chip connects the inverting input of voltage comparator, the output of the voltage comparator identification signal output that comes off as leading behind the second-order low-pass filter that resistance capacitance constitutes.
Described prime impedance matching circuit, lead that to come off that identification circuit, main amplifying circuit, drive circuit, voltage amplifier circuit insert by positive direct-current power supply, negative dc source and positive and negative dc source publicly be the whole circuit power supply.
Compared with prior art, this utility model has been avoided the conformity error of filter pass band and gain setting, has reduced the diversity of intermodule, has effectively overcome the interference of power frequency, has totally obtained ecg signal data accurately and reliably.
Description of drawings Fig. 1 is the electrical schematic diagram that this utility model is used to monitor the circuit of body surface ecg;
Fig. 2 is the formation block diagram of circuit described in the utility model.
The specific embodiment is further described in detail this utility model below in conjunction with most preferred embodiment shown in the drawings: as shown in Figure 1, 2, a kind of circuit that is used to monitor body surface ecg of Design and Machining comprises prime impedance matching circuit 20, identification circuit 90, main amplifying circuit 40, drive circuit 30, voltage amplifier circuit 60 and the low-pass filter circuit 80 of coming off leads; Described prime impedance matching circuit 20 comprises right hand RA passage, left hand LA passage, left foot LL passage, chest lead VX passage and the right lower limb RL passage that leads that leads that leads that leads; The input of these circuit 20 each passages connects leading separately, and the operational amplifier in each passage all is connected into the voltage follower form, and the output of each voltage follower all inserts the described input of identification circuit 90 of coming off that leads; Right hand RA passage, left hand the lead output of LL channel voltage follower of LA passage and left foot of leading of leading is connected together by resistance in the described prime impedance matching circuit 20, insert the input of drive circuit 30 then, the output of right lower limb driving passage connects right lower limb and drives the RL that leads in the described drive circuit 30, and the output that screen layer drives passage meets the screen layer SHIELD that leads; Described the come off outfan LeadsOut of identification circuit 90 of leading is outfans of whole circuit, and microprocessor is received in output, and this outfan is a low level at ordinary times, leads when coming off arbitrary, and this outfan becomes high level; Operational amplifier in the described main amplifying circuit 40 connects and is instrument amplifying circuit form, and its homophase and reverse input end insert RA passage, left hand lead the different two-way in each voltage follower output of LL passage and chest lead VX passage of LA passage, left foot that lead that lead of the right hand in the prime impedance matching circuit 20 respectively; The outfan of described main amplifying circuit 40 inserts the input of described voltage amplifier circuit 60, the output of this circuit 60 connects low-pass filter circuit 80, output Vout0, the Vout1 of described low-pass filter circuit 80 and Vout2 are three outfans of whole circuit, and A/D converter is received in output.
The described prime impedance matching circuit 20 and right hand RA, left hand lead LL, chest lead VX and the right lower limb of LA, left foot that lead that lead leads and is connected to prime low-pass filter circuit 10 between the RL, and each passage all is made of single order RC low pass filter in this circuit 10.
Be connected to high-pass filtering circuit 50 between described main amplifying circuit 40 and the voltage amplifier circuit 60, each passage all is made of single order RC high pass filter in this circuit 50.
Described voltage amplifier circuit 60 comprises operational amplifier U1B, U2B and U3B, and an input of each operational amplifier also connects the outfan of level prewired circuit 70 by resistance R 5, R15 and R25 except meeting feedback resistance R6, R16 and R26; The stabilizing output level of described level prewired circuit 70 is at+2.5V.
Described prime impedance matching circuit 20 comprises operational amplifier U1A, U2A, U3A, U4A and U61B, each operational amplifier all is connected into the voltage follower form, all meets a resistance R 2, R12, R22, R32 and R42 between separately in-phase input end and negative supply VEE.
Described drive circuit 30 comprises operational amplifier U5A and U5B, inverting input connecting resistance R51, the R52 of the in-phase input end of operational amplifier U5A and operational amplifier U5B and the junction point of R53; The output of operational amplifier U5B meets the right lower limb RL that leads, and the output of operational amplifier U5A meets the screen layer SHIELD that leads.
The described identification circuit 90 that comes off of leading comprises logic circuit chip U50, operational amplifier U61A and voltage comparator U71A, the in-phase input end of voltage comparator U71A is connected on the dividing point that is made of resistance R 61 and R62, logic circuit chip U50 is connected into the voltage follower form, its input connects the outfan of logic circuit chip U50, the output of logic circuit chip U50 connects the inverting input of voltage comparator U71A, the output of the voltage comparator U71A identification signal LeadsOUT output that comes off as leading behind the second-order low-pass filter that R63, R64, C61, C62 constitute.
Described prime impedance matching circuit 20, lead that to come off that identification circuit 90, main amplifying circuit 40, drive circuit 30, voltage amplifier circuit 60 insert by positive direct-current power supply VCC, negative dc source VEE and positive and negative dc source public ground GND be that whole circuit is powered.
Operation principle of the present utility model and characteristics are such:
Because body surface ecg is very faint, electrocardiosignal is led and human body contact resistance and electrocardiosignal source have bigger internal resistance, in order to obtain electrocardiosignal effectively, prime impedance matching circuit 20 need be set, this utility model most preferred embodiment has adopted the operational amplifier with JET input in match circuit 20, connect into the voltage follower circuit form, improve the input impedance of electrocardio testing circuit, can obtain electrocardiosignal to greatest extent.
The in-phase end of each amplifier applies the negative DC voltage of a 5V by the resistance of a big resistance in prime impedance matching circuit 20, and connect the in-phase end of a voltage comparator at the outfan of this amplifier, and reference voltage of the anti-phase termination of this comparator, when leading normal the use, above-mentioned 5V voltage is because the human body resistance dividing potential drop obtains the input of very little voltage to amplifier, just be added in the in-phase end of above-mentioned voltage comparator, at this moment the current potential height of this comparator end of oppisite phase is output as low level; Lead when coming off when certain, the unsettled then human body resistance that leads increases to approach infinity, and at this moment the in-phase end that just is input to comparator of this 5V makes the current potential of in-phase end be higher than end of oppisite phase, and then comparator is output as high level.
Because there is bigger static polarizing voltage in body surface, may up to+/-300mV, do not isolate and to produce the follow-up saturated phenomenon of amplifying circuit output, need be by high-pass filtering circuit every going this polarizing voltage, guarantee the operate as normal of follow-up amplifying circuit, one-level RC high-pass filtering circuit 50 is set here, is 0.05Hz (three dB bandwidth) according to the lower bound frequency of this high-pass filtering circuit of electrocardiosignal standard-required.
Because the high fdrequency component of electrocardiosignal is few, and the overwhelming majority all concentrates on below the 40Hz, according to the standard of diagnosis electrocardiosignal and the restriction of subsequent data inversion frequency, low-pass filter circuit 80 is set, here be to adopt one-level RC low-pass filtering, the cut-off frequency of this low-pass filtering is set to 120Hz.
Facts have proved, this utility model is used to monitor the circuit constructive method of body surface ecg and the conformity error that device has avoided filter pass band and gain to be provided with, reduce the diversity of intermodule, effectively overcome the interference of power frequency, totally obtained ecg signal data accurately and reliably.
Claims (8)
1. circuit that is used to monitor body surface ecg is characterized in that: comprise prime impedance matching circuit (20), identification circuit (90), main amplifying circuit (40), drive circuit (30), voltage amplifier circuit (60) and the low-pass filter circuit (80) of coming off leads; Described prime impedance matching circuit (20) comprises right hand RA passage, left hand LA passage, left foot LL road, chest lead VX passage and the right lower limb RL passage that leads that leads that leads that leads; The input of each passage of this circuit (20) connects leading separately, and the operational amplifier in each passage all is connected into the voltage follower form, and the output of each voltage follower all inserts the described input of identification circuit (90) of coming off that leads; Right hand RA passage, left hand the lead output of LL channel voltage follower of LA passage and left foot of leading of leading is connected together by resistance in the described prime impedance matching circuit (20), insert the input of drive circuit (30) then, the output of right lower limb driving passage connects right lower limb and drives the RL that leads in the described drive circuit (30), and the output that screen layer drives passage meets the screen layer SHIELD that leads; Described the come off outfan LeadsOut of identification circuit (90) of leading is an outfan of whole circuit, and microprocessor is received in output, and this outfan is a low level at ordinary times, leads when coming off arbitrary, and this outfan becomes high level; Operational amplifier in the described main amplifying circuit (40) connects and is instrument amplifying circuit form, and its homophase and reverse input end insert RA passage, left hand lead the different two-way in each voltage follower output of LL passage and chest lead VX passage of LA passage, left foot that lead that lead of the right hand in the prime impedance matching circuit (20) respectively; The outfan of described main amplifying circuit (40) inserts the input of described voltage amplifier circuit (60), the output of this circuit (60) connects low-pass filter circuit (80), output Vout0, the Vout1 of described low-pass filter circuit (80) and Vout2 are three outfans of whole circuit, and A/D converter is received in output.
2. according to the described circuit that is used to monitor body surface ecg of claim 1, it is characterized in that: the described prime impedance matching circuit (20) and right hand RA, left hand lead LL, chest lead VX and the right lower limb of LA, left foot that lead that lead leads and is connected to prime low-pass filter circuit (10) between the RL, and each passage all is made of single order RC low pass filter in this circuit (10).
3. according to the described circuit that is used to monitor body surface ecg of claim 1, it is characterized in that: be connected to high-pass filtering circuit (50) between described main amplifying circuit (40) and the voltage amplifier circuit (60), each passage all is made of single order RC high pass filter in this circuit (50).
4. according to the described circuit that is used to monitor body surface ecg of claim 1, it is characterized in that: described voltage amplifier circuit (60) comprises that operational amplifier U1B, U2B and U3B are, an input of each operational amplifier also connects the outfan of level prewired circuit (70) by resistance R 5, R15 and R25 except meeting feedback resistance R6, R16 and R26; The stabilizing output level of described level prewired circuit (70) is at+2.5V.
5. according to the described circuit that is used to monitor body surface ecg of claim 1, it is characterized in that: described prime impedance matching circuit (20) comprises operational amplifier U1A, U2A, U3A, U4A and U61B, each operational amplifier all is connected into the voltage follower form, all meets a resistance R 2, R12, R22, R32 and R42 between separately in-phase input end and negative supply VEE.
6. want the 1 described circuit that is used to monitor body surface ecg according to right, it is characterized in that: described drive circuit (30) comprises operational amplifier U5A and U5B, inverting input connecting resistance R51, the R52 of the in-phase input end of operational amplifier U5A and operational amplifier U5B and the junction point of R53; The output of operational amplifier U5B meets the right lower limb RL that leads, and the output of operational amplifier U5A meets the screen layer SHIELD that leads.
7. according to the described circuit that is used to monitor body surface ecg of claim 1, it is characterized in that: the described identification circuit (90) that comes off of leading comprises logic circuit chip U50, operational amplifier U61A and voltage comparator U71A, the in-phase input end of voltage comparator U71A is connected on the dividing point that is made of resistance R 61 and R62, logic circuit chip U50 is connected into the voltage follower form, its input connects the outfan of logic circuit chip U50, the output of logic circuit chip U50 connects the inverting input of voltage comparator U71A, and the output of voltage comparator U71A is through R63, R64, C61, identification signal LeadsOUT output comes off as leading behind the second-order low-pass filter that C62 constitutes.
8. according to the described circuit that is used to monitor body surface ecg of claim 1, it is characterized in that: described prime impedance matching circuit (20), lead that to come off that identification circuit (90), main amplifying circuit (40), drive circuit (30), voltage amplifier circuit (60) insert by positive direct-current power supply VCC, negative dc source VEE and positive and negative dc source public ground GND be that whole circuit is powered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320117538 CN2664593Y (en) | 2003-10-27 | 2003-10-27 | Body surface electrocardiosignal monitoring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320117538 CN2664593Y (en) | 2003-10-27 | 2003-10-27 | Body surface electrocardiosignal monitoring circuit |
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| Publication Number | Publication Date |
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| CN2664593Y true CN2664593Y (en) | 2004-12-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200320117538 Expired - Lifetime CN2664593Y (en) | 2003-10-27 | 2003-10-27 | Body surface electrocardiosignal monitoring circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104398255A (en) * | 2014-11-20 | 2015-03-11 | 广西大学 | Portable electrocardio measurement device |
| CN106618527A (en) * | 2016-11-24 | 2017-05-10 | 深圳市奕天博创科技有限公司 | Monitoring device and method for remote detection of human vital signs |
| CN107456228A (en) * | 2017-03-07 | 2017-12-12 | 铂元智能科技(北京)有限公司 | Wireless pressure electrocardio measuring device |
| CN109975878A (en) * | 2017-12-27 | 2019-07-05 | 四川锦江电子科技有限公司 | It falls off the device and method of detection for three-dimensional mapping system body surface excitation electrode slice |
-
2003
- 2003-10-27 CN CN 200320117538 patent/CN2664593Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104398255A (en) * | 2014-11-20 | 2015-03-11 | 广西大学 | Portable electrocardio measurement device |
| CN106618527A (en) * | 2016-11-24 | 2017-05-10 | 深圳市奕天博创科技有限公司 | Monitoring device and method for remote detection of human vital signs |
| CN107456228A (en) * | 2017-03-07 | 2017-12-12 | 铂元智能科技(北京)有限公司 | Wireless pressure electrocardio measuring device |
| CN109975878A (en) * | 2017-12-27 | 2019-07-05 | 四川锦江电子科技有限公司 | It falls off the device and method of detection for three-dimensional mapping system body surface excitation electrode slice |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20131027 Granted publication date: 20041222 |