CN200970233Y - Filter for improving intracardiac electric physiological wave form while intracardiac electrode output stimulating - Google Patents
Filter for improving intracardiac electric physiological wave form while intracardiac electrode output stimulating Download PDFInfo
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- CN200970233Y CN200970233Y CN 200620036357 CN200620036357U CN200970233Y CN 200970233 Y CN200970233 Y CN 200970233Y CN 200620036357 CN200620036357 CN 200620036357 CN 200620036357 U CN200620036357 U CN 200620036357U CN 200970233 Y CN200970233 Y CN 200970233Y
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- 230000004936 stimulating effect Effects 0.000 title claims description 8
- 238000006243 chemical reaction Methods 0.000 claims abstract description 19
- 238000012545 processing Methods 0.000 claims abstract description 11
- 238000002001 electrophysiology Methods 0.000 claims abstract description 9
- 230000007831 electrophysiology Effects 0.000 claims abstract description 9
- 238000001914 filtration Methods 0.000 abstract description 12
- 230000003044 adaptive effect Effects 0.000 abstract description 5
- 230000000638 stimulation Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000003321 amplification Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000000747 cardiac effect Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000661 pacemaking effect Effects 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 238000011045 prefiltration Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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Abstract
The utility model discloses a filtering device for improving the intracardiac electrophysiology wave in stimulation output of intracardiac electrode, including a signal input end, an analog to digital conversion circuit and a signal processing chip connected with the analog to digital conversion circuit. The utility model has characteristics in that, the signal input end is connected with the analog to digital conversion circuit through an analog switch, and a power frequency signal collection circuit is connected on the analog to digital conversion circuit. The utility model has beneficial effects: the power frequency signal is the reference signal, after the processing of adaptive filtering algorithm in the signal processing chip, and the bandwidth is only 1 Hz, so the frequency component around the assigned frequency has no effect basically, the output signal has no deformation under stimulation, and the notch depth can reach to 30 dB.
Description
Technical field
This utility model relates to bio electricity Detection of Weak Signals instrument field, especially a kind of filter with intracardiac electrophysiology waveform when improving intracardiac electrode output stimulation.
Background technology
For the filtering power frequency is disturbed, present electrocardio class Medical Instruments all adopts common wave trap, Chinese invention patent description for example, announced a kind of heart physiological pace-making/programmable stimulator on May 5th, 2004 with cardiac monitoring function, notification number CN1148233C, it comprises pre-amplification circuit, trap circuit; The low-pass filtering amplifying circuit, single order integration and peaker, gain control circuit, comparison circuit, photoelectricity coupling circuit, heart rate audio indicating apparatus, single chip circuit, superaudio oscillating circuit, boost rectifying circuit, shaping amplification circuit, output port.Also include the low-pass filtering amplifying circuit that is connected on another road output of trap circuit, zeroing circuit, analog to digital conversion circuit, display process single chip circuit, data display circuit.Its filtering part has just adopted trap circuit, yet because trap circuit has certain bandwidth, when stimulus signal is imported, can cause intracardiac signal skew, thereby bring error to medical diagnosis.
Summary of the invention
The purpose of this utility model is: overcome deficiency and shortcoming with pre-filter, provide a kind of and can effectively solve the problem that intracardiac electrode is exported intracardiac signal skew when stimulating, improve the filter of intracardiac electrophysiology waveform when stimulating.
The technical solution of the utility model is:
A kind of filter that improves intracardiac electrophysiology waveform when stimulating, include signal input part, analog to digital conversion circuit and the signal processing chip that is connected with analog to digital conversion circuit, it is characterized in that, signal input part is connected on the analog to digital conversion circuit after by analog switch, also is connected with the power frequency component Acquisition Circuit on the analog to digital conversion circuit.
Preferably, can select for use power supply signal, transmit, before the input analog to digital conversion circuit, carry out processing and amplifying and low-pass filtering again, so that obtain more purified power frequency component through after the attenuation processing as the power frequency component source.
In signal processing chip, filter out assigned frequency signal purpose by the power frequency component of gathering being carried out the adaptive-filtering processing, can reaching.
The beneficial effects of the utility model are: gather power frequency component as the reference signal, adaptive filter algorithm through signal processing chip is handled, its bandwidth is 1Hz only, therefore near the frequency content the assigned frequency there is not influence substantially, electrophysiological spike shape did not have distortion substantially when stimulation was arranged, and notch depth can reach 30dB.
Description of drawings
Fig. 1 is a schematic block circuit diagram of the present utility model
Fig. 2 is the circuit theory diagrams of power frequency component collection, conditioning part
The specific embodiment
Below in conjunction with drawings and Examples this utility model is further specified.
Specific embodiment of the utility model, a kind of as depicted in figs. 1 and 2 filter that improves intracardiac electrophysiology waveform when stimulating, include signal input part, analog to digital conversion circuit and the signal processing chip that is connected with analog to digital conversion circuit, signal input part is connected on the analog to digital conversion circuit after by analog switch, also be connected with the power frequency component Acquisition Circuit on the analog to digital conversion circuit, its schematic block circuit diagram as shown in Figure 1.Present embodiment selects for use power supply signal as the power frequency component source, power supply signal is through behind the signal condition, deliver to the input IN1 of analog switch, analog switch is under the effect of control signal CTL, in turn switched input signal IN1, IN2, IN3 ..., INn gives analog-digital converter, send into dsp processor at last and handle.IN2, IN3 ..., INn represents normal electrocardiosignal of gathering.
By last narration as can be known, deliver to the signal processor, also need add paths sampling 50Hz power supply signal and deliver to signal processor as the reference signal except multi-channel analog channel sample electrocardiogram (ECG) data.The effect one of signal condition is the collection requirement that will satisfy analog-digital converter, the 2nd, reduce of the interference of 50Hz power supply signal to faint electrocardiosignal.The 50Hz power supply signal should be decayed earlier before transmission, is amplified to the level amplitude of analog-digital converter requirement again before being transferred to analog switch, and doing low-pass filtering.For the 50Hz power supply signal that analog-digital converter is collected does not have flip-flop, make adaptive filter algorithm simpler, before the transmission of 50Hz power supply signal, also should remove flip-flop.After the simple approach of removing flip-flop is coupled to signal with a little electric capacity exactly, transmission again.Its physical circuit as shown in Figure 2, F1, F2, F3 are protective tubes, T1 is a transformator, U1, U2 are operational amplifiers.Power supply is by behind the transformator T1, and output amplitude is the 50Hz AC signal of 2V.Because the electrocardiosignal that will gather is a small-signal, in order to reduce the interference of 50Hz power supply signal to electrocardiosignal, need decay to the 50Hz power supply signal.Here with R1 and R2 series connection dividing potential drop, reduce signal amplitude to about the 16mv, on circuit board, transmit again.The purpose of coupling capacitance C1 is a stopping direct current, removes the flip-flop in the 50Hz power supply signal.In order to satisfy the collection requirement of analog-digital converter, also need to amplify with amplifier U1, resistance R 3 and R4 have determined amplification.In order to reduce the suffered interference of 50Hz power supply signal, make analog-digital converter collect more purified 50Hz power supply signal, done a second order active low-pass filter with amplifier U2, output to analog switch at last.
The 50Hz power supply signal that collects is delivered to signal processor as the reference signal, and this reference signal needs to become two-way quadrature cosine and sine signal X1, X2 through the HILBERT conversion in signal processor, adopts adaptive filter algorithm to filter the 50Hz signal then.
The adaptive filter algorithm that is adopted is exemplified below:
Estimating noise noise (k)=W1 (k) * X1 (k)+W2 (k) * X2 (k), W1, W2 are for revising weights.
Signal signal (k) after the filtering=D (k)-noise (k), D is the filtering front signal.
Weights W1=W1+MJU*signal (k) * X1 (k), W2=W2+MJU*signal (k) * X2 (k).
Correction factor MJU=MJU*ALFA+GAMA*P,
Wherein, P=BETA*P+ (1-BETA) * SIGNAL (k) * SIGNAL (k-1).
More than various iteration successively can realize adaptive-filtering.MJU should be according to the given initial value of system performance, and ALFA, GAMA, BETA are constant, also should be given according to system performance, and with truncated error control within the acceptable range.
In actual applications, analog switch P2, digital-to-analogue amplifier P3, signal processor P4 should select concrete model as required.Analog switch P2 can be controlled or be added a slice in addition and be used as the chip of controlling by signal processor P4.Signal processor P4 can adopt DSP, MCU, FPGA or PC to realize.
Claims (3)
1. one kind is improved the filter that intracardiac electrode is exported intracardiac electrophysiology waveform when stimulating, include signal input part, analog to digital conversion circuit and the signal processing chip that is connected with analog to digital conversion circuit, it is characterized in that, signal input part is connected on the analog to digital conversion circuit after by analog switch, also is connected with the power frequency component Acquisition Circuit on the analog to digital conversion circuit.
2. the filter of intracardiac electrophysiology waveform when improving intracardiac electrode output and stimulating according to claim 1 is characterized in that described power frequency component source is a power supply signal.
3. the filter of intracardiac electrophysiology waveform when improving intracardiac electrode output and stimulating according to claim 2, it is characterized in that, the power frequency component Acquisition Circuit includes power supply signal input, attenuator circuit, amplifying circuit and the low-pass filter circuit that connects successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620036357 CN200970233Y (en) | 2006-11-22 | 2006-11-22 | Filter for improving intracardiac electric physiological wave form while intracardiac electrode output stimulating |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620036357 CN200970233Y (en) | 2006-11-22 | 2006-11-22 | Filter for improving intracardiac electric physiological wave form while intracardiac electrode output stimulating |
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| CN200970233Y true CN200970233Y (en) | 2007-11-07 |
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| CN 200620036357 Expired - Lifetime CN200970233Y (en) | 2006-11-22 | 2006-11-22 | Filter for improving intracardiac electric physiological wave form while intracardiac electrode output stimulating |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441740A (en) * | 2013-08-28 | 2013-12-11 | 武汉矽感科技有限公司 | Weak-signal amplifying circuit |
| CN108175404A (en) * | 2018-01-11 | 2018-06-19 | 成都心吉康科技有限公司 | Electrocardiogram signal acquisition device and the method for inhibiting touch interference |
| CN109107041A (en) * | 2018-07-13 | 2019-01-01 | 成都心吉康科技有限公司 | Pace-making signal detection method, device and wearable health equipment |
-
2006
- 2006-11-22 CN CN 200620036357 patent/CN200970233Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441740A (en) * | 2013-08-28 | 2013-12-11 | 武汉矽感科技有限公司 | Weak-signal amplifying circuit |
| CN103441740B (en) * | 2013-08-28 | 2016-03-30 | 武汉矽感科技有限公司 | A kind of small signals amplification circuit |
| CN108175404A (en) * | 2018-01-11 | 2018-06-19 | 成都心吉康科技有限公司 | Electrocardiogram signal acquisition device and the method for inhibiting touch interference |
| CN108175404B (en) * | 2018-01-11 | 2023-08-01 | 成都心吉康科技有限公司 | Electrocardiosignal acquisition device and method for inhibiting touch interference |
| CN109107041A (en) * | 2018-07-13 | 2019-01-01 | 成都心吉康科技有限公司 | Pace-making signal detection method, device and wearable health equipment |
| CN109107041B (en) * | 2018-07-13 | 2021-11-12 | 成都心吉康科技有限公司 | Pace-making signal detection method and device and wearable health equipment |
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Owner name: SICHUAN JINJIANG ELECTRONIC SCIENCE AND TECHNOLOGY Free format text: FORMER OWNER: LI CHUYA Effective date: 20100813 |
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Free format text: CORRECT: ADDRESS; FROM: 610000 NO.5, WUKEDONGSAN ROAD, WUHOU SCIENCE AND TECHNOLOGY PARK, WUHOU DISTRICT, CHENGDU CITY, SICHUAN PROVINCE TO: 610000 NO.5, WUKEDONGSAN ROAD, WUHOU SCIENCE AND TECHNOLOGY PARK, NEW + HIGH TECHNOLOGY INDUSTRY DEVELOPMENT ZONE, CHENGDU CITY, SICHUAN PROVINCE |
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| TR01 | Transfer of patent right |
Effective date of registration: 20100813 Address after: Wuhou Science Park Vuko East three road, hi tech Industrial Development Zone, Chengdu city of Sichuan Province, No. 5 610000 Patentee after: Sichuan Jinjiang Electronic Science and Technology Co., Ltd. Address before: 610000 Sichuan city of Chengdu province Wuhou District Wuhou Science Park Vuko East Three Road No. 5 Patentee before: Li Chuya |
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| ASS | Succession or assignment of patent right |
Owner name: LI CHUWEN Free format text: FORMER OWNER: SICHUAN JINJIANG ELECTRONIC SCIENCE AND TECHNOLOGY CO., LTD. Effective date: 20120726 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20120726 Address after: 610000 Sichuan city of Chengdu province Wuhou District Wuhou Science Park Vuko East Three Road No. 5 Patentee after: Li Chuwen Address before: Wuhou Science Park Vuko East three road, hi tech Industrial Development Zone, Chengdu city of Sichuan Province, No. 5 610000 Patentee before: Sichuan Jinjiang Electronic Science and Technology Co., Ltd. |
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| ASS | Succession or assignment of patent right |
Owner name: SICHUAN JINJIANG ELECTRONIC SCIENCE AND TECHNOLOGY Free format text: FORMER OWNER: LI CHUWEN Effective date: 20121029 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20121029 Address after: Wuhou Science Park Vuko East three road, hi tech Industrial Development Zone, Chengdu city of Sichuan Province, No. 5 610000 Patentee after: Sichuan Jinjiang Electronic Science and Technology Co., Ltd. Address before: 610000 Sichuan city of Chengdu province Wuhou District Wuhou Science Park Vuko East Three Road No. 5 Patentee before: Li Chuwen |
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