CN1806751A - Cardiac monitor module capable of resisting high frequency electric knife interference - Google Patents
Cardiac monitor module capable of resisting high frequency electric knife interference Download PDFInfo
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- CN1806751A CN1806751A CNA2006100131446A CN200610013144A CN1806751A CN 1806751 A CN1806751 A CN 1806751A CN A2006100131446 A CNA2006100131446 A CN A2006100131446A CN 200610013144 A CN200610013144 A CN 200610013144A CN 1806751 A CN1806751 A CN 1806751A
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Abstract
The invention relates to physical electrical field, the medical equipment, which in detail relating to an electric knife-resistant cardio-electric monitoring module, technical project of which comprises: the 0 capacitance-resistance filter receiving the two-way electro-cardio signal, the output of the 0 capacitance-resistance filter passing the first protecting clamper, common mode drive circuit, right-leg drive circuit and the third capacitance-resistance filter in turn; one of said two-way electro-cardio signal passing the first capacitance-resistance filter, the third protecting clamper in turn to be input to parallel differential amplifier; the other electro-cardio signal passing the second capacitance-resistance filter, the second protecting clamper in turn to be input to parallel differential amplifier; the output of which is connected to high-resolution cathode analogue/digital converter; the connection of the first and second capacitance-resistance filter is connected to common mode drive circuit. The invention is mainly used in patient monitor for operation.
Description
Technical field
The present invention relates to the application of electronic technology in medical instrument, specifically relate to cardiac monitor module capable of resisting high frequency electric knife interference.
Background technology
Electric knife (ESU) is a kind of electrosurgical unit of organizing cutting and blood coagulation, it is converted to frequency 400～1000kHz, voltage with the low pressure low-frequency current of 220V/50Hz through variable-frequency variable-voltage, power amplification is several thousand even the high frequency electric of volts up to ten thousand, act on human body by active electrode with high current density, thereby reach the purpose of cutting and blood coagulation.In the operation process, electrocardiosignal (ECG) guarded be absolutely necessary.Yet when electric knife uses, the electrical Interference that it produced can be by health conduction and number of ways such as radiation enter the electrocardiogram acquisition module, make the cardiac monitoring instrument be difficult to obtain correct electrocardiogram (ECG) data, the doctor can not understand patient's situation in time, efficiently and accurately.
Summary of the invention
For overcoming the deficiencies in the prior art, the object of the present invention is to provide and a kind ofly can effectively suppress the interferential cardiac monitoring module of high frequency electric knife.This module can be applicable in the operation monitor device.
The technical solution used in the present invention is:
Cardiac monitor module capable of resisting high frequency electric knife interference comprises the 0th capacitance-resistance filter that is used to receive the two-way electrocardiosignal, and the output of the 0th capacitance-resistance filter is exported via the 1st clamping protective circuit, common mode drive circuit, driven-right-leg circuit and the 3rd capacitance-resistance filter successively; In the described two-way electrocardiosignal a road is input to differential amplifier in parallel via the 1st capacitance-resistance filter, the 3rd clamping protective circuit successively; Another road in the described two-way electrocardiosignal is input to differential amplifier in parallel via the 2nd capacitance-resistance filter, the 2nd clamping protective circuit successively; The output of differential amplifier in parallel is connected to the high-resolution analog-digital converter; The 1st capacitance-resistance filter be connected to the common mode drive circuit after the 2nd capacitance-resistance filter links to each other.
Described capacitance-resistance filter is made of electric capacity that is connected in series and resistance, and an end of resistance connects input signal, and the other end is an outfan; The 0th capacitance-resistance filter comprises the capacitance-resistance filter of two shared electric capacity, and this shared electric capacity is for connecting an end ground connection of resistance; Electric capacity in the 1st capacitance-resistance filter does not connect an end of resistance is not connected resistance with electric capacity in the 2nd capacitance-resistance filter a end and links to each other; Electric capacity in the 3rd capacitance-resistance filter does not connect an end ground connection of resistance.
Described clamping protective circuit is made of the diode to clamp fixed two diode junction point current potentials of two forwards serial connection, the positive termination negative supply of the diode of Lian Jieing not, and the diode negative terminal of Lian Jieing does not connect positive supply.
Described common mode drive circuit is made of the amplifier that has the positive-negative power link, the amplifier positive supply connects the termination positive supply, the amplifier negative supply connects the termination negative supply, and amplifier positive input terminal term is in input signal, and amplifier out connects negative input end.
Described high-resolution analog-digital converter is ∑-Δ pattern number converter.
Described differential amplifier in parallel is made of two amplifiers, the positive input terminal of each amplifier is used to connect one road input signal, the outfan of each amplifier is connected to the negative input end of this amplifier respectively by a resistance, the negative input end of two amplifiers links to each other by a balancing resistance.
Described driven-right-leg circuit is made of an amplifier, this amplifier positive input terminal ground connection, and negative input end connects input signal, and outfan is connected to negative input end via an electric capacity, and outfan is exported by an output resistance.
The present invention possesses following effect: owing to adopted capacitance-resistance filter and high-resolution analog-digital converter, make electrocardiosignal export smoothly, high frequency electric knife disturbs and is prevented from, thereby the invention provides and can effectively suppress the interferential cardiac monitoring module of high frequency electric knife.
Description of drawings
Fig. 1 is that system of the present invention constitutes block diagram.
Fig. 2 is the present invention's one specific embodiment circuit diagram.
The specific embodiment
To provide a kind of and can effectively suppress the interferential cardiac monitoring module of high frequency electric knife purpose in order to reach, the present invention is realized by following technical proposals.Utilize the large time constant resistance-capacitance network that the High-frequency Interference of electric knife is decayed; adopt direct current low gain differential amplifier and high-resolution analog-digital converter that data are gathered simultaneously; avoided the resaistance-capacity coupling circuit in the alternative current amplifier to cause blocking problem easily; also avoided utilizing voltage-limiting protection circuit such as neon bulb, diode to produce non-linear and can not the cardiac electrical problem of continuous monitoring patient, equally also avoided the input dynamic range of high gain amplifier little, entered nonlinear problem easily.
Further specify the present invention below in conjunction with drawings and Examples.
Fig. 1 is a system of the present invention pie graph.
As shown in Figure 1, circuit theory of the present invention is as follows: two-way human ecg signal V
I1, V
I2Capacitance-resistance filter 1 and 2 by being made up of big resistance resistance and low-capacitance electric capacity passes through the differential amplifier amplification in parallel that clamping protective circuit is input to low gain more respectively, is input to the high-resolution analog-digital converter at last.
When not using high frequency electric knife, because electrocardiosignal is in the free transmission range of capacitance-resistance filter, electrocardiosignal enters differential amplifier in parallel almost undampedly, and the signal input high-resolution analog-digital converter after the amplification converts digital signal to.Though the gain of differential amplifier in parallel is not high, the high-resolution of analog-digital converter is enough to the gain of compensating circuit, obtains the electrocardiosignal of enough resolution.The benefit of circuit low gain is the circuit blockage problem that guarantees that thereby circuit has enough dynamic ranges and avoids high gain circuit must use alternative current amplifier to bring.
When using high frequency electric knife,, thereby can decay to the not enough operate as normal that influences subsequent conditioning circuit to it because its operating frequency is higher than the cut-off frequency of capacitance-resistance filter far away.Because capacitance-resistance filter is passive, linear unit, thereby can not bring non-linear distortion.
Produce common mode disturbances for the mismatch that prevents device parameters in the two-way capacitance-resistance filter and change differential mode interference into; with provide common-mode signal for driven-right-leg circuit; the two-way input signal synthesizes common-mode signal by capacitance-resistance filter 0, enters the common mode drive circuit through after the clamping protective circuit.Capacitance-resistance filter 1 and 2 and driven-right-leg circuit are given in the output of common mode drive circuit respectively.
The output of driven-right-leg circuit also is connected to capacitance-resistance filter 3, and this is to scurry into amplifier for the high-frequency signal that prevents electric knife through driven-right-leg circuit.
The high pressure that three clamping protective circuit in the circuit occur in order to prevent to use defibrillator damages circuit and is provided with.
Embodiment below in conjunction with Fig. 2 is further detailed the present invention.
R3 and C1, R4 and C2 constitute the capacitance-resistance filter 1 and 2 of two input channels respectively, and D3 and D4, D5 and D6 constitute two clamping protective circuit respectively.If high frequency electric knife when work, capacitance-resistance filter decays to enough little amplitude with high-frequency interferencing signal, and clamping protective circuit works and protects differential amplifier in parallel to be without prejudice when the defibrillation high pressure occurring.A1, A2, R5, R6 and RW constitute differential amplifier in parallel input signal are amplified.Signal after the amplification is input in the high-resolution analog-digital converter and converts digital signal to.In the present embodiment, selected ∑-Δ pattern number converter for use, the AD7740 that produces as U.S. ADI company, or the ∑-Δ pattern number converter that becomes one with single-chip microcomputer are as ADuC847.
R1, R2 and C0 capacitance-resistance filter 0, one side is synthetic to obtain common-mode signal, also is used for the High-frequency Interference of filtering electric knife on the other hand.
D1 and D2 constitute clamping protective circuit, penetrate with device A0 in order to protection.Drive C1 and C2 in capacitance-resistance filter 1 and 2 respectively by A0 output common mode signal, also output to the driven-right-leg circuit that A3, C3 and R7, R8 form simultaneously, the inverting amplifier or the integrator that constitute by operational amplifier.R9 and C4 constitute capacitance-resistance filter 3, scurry into driven-right-leg circuit in order to the High-frequency Interference that prevents electric knife.
Claims (7)
1. cardiac monitor module capable of resisting high frequency electric knife interference, it is characterized in that, comprise the 0th capacitance-resistance filter that is used to receive the two-way electrocardiosignal, the output of the 0th capacitance-resistance filter is exported via the 1st clamping protective circuit, common mode drive circuit, driven-right-leg circuit and the 3rd capacitance-resistance filter successively; In the described two-way electrocardiosignal a road is input to differential amplifier in parallel via the 1st capacitance-resistance filter, the 3rd clamping protective circuit successively; Another road in the described two-way electrocardiosignal is input to differential amplifier in parallel via the 2nd capacitance-resistance filter, the 2nd clamping protective circuit successively; The output of differential amplifier in parallel is connected to the high-resolution analog-digital converter; The 1st capacitance-resistance filter links to each other with the 2nd capacitance-resistance filter.
2. a kind of cardiac monitor module capable of resisting high frequency electric knife interference according to claim 1 is characterized in that described capacitance-resistance filter is made of electric capacity that is connected in series and resistance, and an end of resistance connects input signal, and the other end is an outfan; The 0th capacitance-resistance filter comprises the capacitance-resistance filter of two shared electric capacity, and this shared electric capacity is for connecting an end ground connection of resistance; Electric capacity in the 1st capacitance-resistance filter does not connect an end of resistance is not connected resistance with electric capacity in the 2nd capacitance-resistance filter a end and links to each other; Electric capacity in the 3rd capacitance-resistance filter does not connect an end ground connection of resistance.
3. a kind of cardiac monitor module capable of resisting high frequency electric knife interference according to claim 1; it is characterized in that; described clamping protective circuit is made of the diode to clamp fixed two diode junction point current potentials of two forward serial connections; the positive termination negative supply of the diode of Lian Jieing not, the diode negative terminal of Lian Jieing does not connect positive supply.
4. a kind of cardiac monitor module capable of resisting high frequency electric knife interference according to claim 1, it is characterized in that, described common mode drive circuit is made of the amplifier that has the positive-negative power link, the amplifier positive supply connects the termination positive supply, the amplifier negative supply connects the termination negative supply, amplifier positive input terminal term is in input signal, and amplifier out connects negative input end.
5. a kind of cardiac monitor module capable of resisting high frequency electric knife interference according to claim 1 is characterized in that, described high-resolution analog-digital converter is ∑-Δ pattern number converter.
6. a kind of cardiac monitor module capable of resisting high frequency electric knife interference according to claim 1, it is characterized in that, described differential amplifier in parallel is made of two amplifiers, the positive input terminal of each amplifier is used to connect one road input signal, the outfan of each amplifier is connected to the negative input end of this amplifier respectively by a resistance, the negative input end of two amplifiers links to each other by a balancing resistance.
7. a kind of cardiac monitor module capable of resisting high frequency electric knife interference according to claim 1, it is characterized in that, described driven-right-leg circuit is made of an amplifier, this amplifier positive input terminal ground connection, negative input end connects input signal, outfan is connected to negative input end via an electric capacity, and outfan is exported by an output resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100131446A CN100418473C (en) | 2006-01-27 | 2006-01-27 | Cardiac monitor module capable of resisting high frequency electric knife interference |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100131446A CN100418473C (en) | 2006-01-27 | 2006-01-27 | Cardiac monitor module capable of resisting high frequency electric knife interference |
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| CN1806751A true CN1806751A (en) | 2006-07-26 |
| CN100418473C CN100418473C (en) | 2008-09-17 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103239222A (en) * | 2013-04-17 | 2013-08-14 | 深圳市科曼医疗设备有限公司 | Electrocardio signal acquisition device and method |
| CN103732168A (en) * | 2011-07-28 | 2014-04-16 | 德雷格医疗系统股份有限公司 | Radio frequency procedure protection |
| CN106037721A (en) * | 2016-05-14 | 2016-10-26 | 合肥诺和电子科技有限公司 | Method for preventing abnormity of display system under electrotome interference |
| CN106333745A (en) * | 2016-10-21 | 2017-01-18 | 昆明医科大学第附属医院 | Electric knife system based on biomedical signal control and control method of electric knife system |
| CN108601523A (en) * | 2015-12-17 | 2018-09-28 | 德尔格医疗系统有限责任公司 | Circuit and method for electrosurgery unit signal detection |
-
2006
- 2006-01-27 CN CNB2006100131446A patent/CN100418473C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103732168A (en) * | 2011-07-28 | 2014-04-16 | 德雷格医疗系统股份有限公司 | Radio frequency procedure protection |
| CN103239222A (en) * | 2013-04-17 | 2013-08-14 | 深圳市科曼医疗设备有限公司 | Electrocardio signal acquisition device and method |
| CN108601523A (en) * | 2015-12-17 | 2018-09-28 | 德尔格医疗系统有限责任公司 | Circuit and method for electrosurgery unit signal detection |
| CN106037721A (en) * | 2016-05-14 | 2016-10-26 | 合肥诺和电子科技有限公司 | Method for preventing abnormity of display system under electrotome interference |
| CN106037721B (en) * | 2016-05-14 | 2018-10-09 | 合肥诺和电子科技有限公司 | A method of it is abnormal to prevent the lower display system of electric knife interference |
| CN106333745A (en) * | 2016-10-21 | 2017-01-18 | 昆明医科大学第附属医院 | Electric knife system based on biomedical signal control and control method of electric knife system |
| CN106333745B (en) * | 2016-10-21 | 2018-07-13 | 昆明医科大学第一附属医院 | Electric knife system based on biomedicine signals control |
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|---|---|
| CN100418473C (en) | 2008-09-17 |
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