CN102885620A - Ventricular tachycardia detector and detection method thereof - Google Patents

Abstract

The invention discloses a ventricular tachycardia detector and a detection method thereof. The detector comprises an active electrocardio-electrode, and a processing device communicating with the active electrocardio-electrode; the active electrocardio-electrode is clung to the heart of a human body and used for collecting an electrocardiosignal, adjusting and converting, sending in the processing device for detection processing, and then sending out a state signal. The active electrocardio-electrode consists of an electrocardio-sensor, an amplification filter, an analog-to-digital conversion module, a sending interface circuit and a first power supply circuit; and the processing device consists of a receiving interface circuit, a reference electrocardio-module, a ventricular tachycardia detection module and a second power supply circuit. According to the ventricular tachycardia detector and the detection method thereof, the miniaturized circuits with low power consumption are used for processing electrocardio-data, the circuits have strong functions, low power consumption and high reliability, and the ventricular tachycardia can be precisely detected according to shape of a probability density function curve of distances between two points of the electrocardiosignal subjected to phase-space reconstruction and characteristic parameter extraction by adopting a probability density function method.

Description

Ventricular tachycardia checkout gear and detection method thereof

Technical field

The invention belongs to technical field of medical instruments, relate to a kind of checkout gear, relate in particular to a kind of ventricular tachycardia checkout gear; Simultaneously, the invention still further relates to a kind of detection method of ventricular tachycardia checkout gear.

Background technology

Cardiac sudden death (Sudden Cardiac Death, SCD) refer to that heart sympton begins the death that occurs in rear one hour, most by ventricular fibrillation (Ventricular Fibrillation, VF) or sustained ventricular tachycardia (Ventricular Tachycardia, VT) worsen as due to the VF.Ventricular tachycardia refers to originate from the tachycardia of the following roomy lopsided QRS wave component more than 3-5 of Xi Shi bundle crotch.It is different and different with the cardiac function situation that the clinical symptoms weight of chamber speed is looked when outbreak Ventricular Rate, persistent period, basic heart change.The patient of non-standing chamber fast (duration of seizure is shorter than 30 seconds, can stop voluntarily) is usually asymptomatic, and persistence chamber speed (duration of seizure surpasses 30 seconds, needs medicine or electrical conversion to begin and can stop) is often with obvious hemodynamics obstacle and myocardial ischemia.Annual approximately 40～500,000 people of the U.S. suffer from this kind arrhythmia, in China, though without the accurate statistics numeral, absolute number certainly more than these.Owing to VT, VF often the absence of aura symptom break out, rapid threat to life therefore lose favourable rescue opportunity more.In the 157 routine cardiac sudden death of the report such as Luna, Holter before death records and shows, the Primary Ventricular fibrillation is 8%, and ventricular tachycardia develops into VF and accounts for 62%, and torsive ventricular tachycardia 13% is crossed slow arrhythmia 17%.Most VT are because due to cardiac muscle and visceral senses turn back.This turning back turned back for small, is the reason of bringing out VT and VF.Be 96 seconds the average time that ventricular tachycardia develops into ventricular fibrillation.As seen ventricular tachycardia often develops into VF, causes cardiac sudden death.If detect ventricular tachycardia and make active treatment in the very first time, can greatly reduce the generation of cardiac sudden death.

Although developed all kinds of ventricular tachycardia checkout gears, also automatically detect and warning function with ventricular tachycardia such as existing monitor, but in actual applications, because equipment is larger, carry inconvenience, so miniaturization, low-power consumption are the developing direction of ventricular tachycardia checkout gear.

Summary of the invention

Technical problem to be solved by this invention is: a kind of ventricular tachycardia checkout gear is provided, can realizes the real-time monitoring of ventricular tachycardia, reliability is high simultaneously, has good portability.

In addition, the present invention also provides the measuring method of above-mentioned ventricular tachycardia checkout gear, can realize the real-time monitoring of ventricular tachycardia, and reliability is high simultaneously, has good portability.

For solving the problems of the technologies described above, the present invention adopts following technical scheme:

A kind of ventricular tachycardia checkout gear, described device comprises: active electrocardioelectrode, the blood processor of communicating by letter with described active electrocardioelectrode;

Described active electrocardioelectrode is attached near the human heart, gathers electrocardiosignal through after adjusting conversion, sends into and carries out Check processing in the blood processor, sends status signal;

Described active electrocardioelectrode comprises EGC sensor, amplifilter, analog-to-digital conversion module, transmission interface circuit and the first power supply circuits; EGC sensor, amplifilter, analog-to-digital conversion module, transmission interface circuit connect successively; Described EGC sensor is measured the electrocardiosignal that gathers the patient, sends into amplifilter filtering, then is sent to the transmission interface circuit through analog-to-digital conversion module and outputs to blood processor;

Described blood processor comprises the receiving interface circuit, with reference to electrocardio module, ventricular tachycardia detection module and the second power supply circuits; Described ventricular tachycardia detection module is respectively with the receiving interface circuit, be connected with reference to the electrocardio module; The signal of the active electrocardioelectrode output that the receiving interface circuit receives, all be sent to the ventricular tachycardia detection module with reference to the signal of electrocardio module, the ventricular tachycardia detection module obtains result data through after the comparison process.

As a preferred embodiment of the present invention, described blood processor also comprises display module, memory module, the warning circuit that is connected with the ventricular tachycardia detection module; The ventricular tachycardia detection module send respectively display module, memory module and warning circuit through after the comparison process with data.

As a preferred embodiment of the present invention, described amplifilter comprises amplifying circuit and the filter circuit of series connection;

Described filter circuit comprises band filter and the notch filter of series connection; Band filter adopts unlimited gain multiple feedback type filter circuit, is used for filtering direct current and High-frequency Interference; Described notch filter circuit is selected the active filter with twin-T network, is used for the filtering power frequency component.

As a preferred embodiment of the present invention, described ventricular tachycardia detection module adopts MLMS algorithm filtering electrocardio interference component, sets the electrocardiosignal that gathers and is:

d _j＝b _j+h _j′+n _j′ （1）

Wherein, b _jCollection value for signal center's electricity composition; h _j' be the electrocardio composition that transmits by body wall; n _j' for the random noise of primary input end; And the electrocardiosignal of reference input access gathers from apex of the heart position, for:

x _j＝h _j+n _j （2）

Wherein, h _jBe electrocardio reference signal collection value; n _jBe the noise in the reference signal;

If n _j, n _j' and b _jFor incoherent mutually, and they and h _j, h _j' also uncorrelated, the fundamental equation that can obtain thus self-adapted noise elimination sound device is:

e _j＝d _j-y _j （3）

Determine y _jEquation decided by the adaptive algorithm that adopts; Adopt the MLMS algorithm, its recurrence equation is

e _j＝d _j-W _j-1 ^TX _j （4）

5G _j＝2μ/[1+2μX _j ^TX _j] （5）

W _j＝W _j-1+G _je _jX _j （6）

Wherein, W _jBe j self adaptation weight vector constantly; Set it and be p rank vector, establish

W _j=[W _j0,W _j1,......,W _j,p-1] ^T

And X _jBe the input signal vector of sef-adapting filter, for: X _j=[X _j, X _J-1..., X _J-(p-1)] ^T

In described ventricular tachycardia detection module, after the electrocardiosignal filtering interfering, adopt the probability density function method, according to the probability density function curve shape of distance between two points behind the electrocardiosignal phase space reconfiguration and extract characteristic parameter k _n, utilize characteristic parameter k _nCan accurately detect ventricular tachycardia.

As a preferred embodiment of the present invention, described transmission interface circuit is connected shielded cable to connect with the receiving interface circuit.

As a preferred embodiment of the present invention, described warning circuit comprises acoustic alarm module and light alarm module.

A kind of detection method of above-mentioned ventricular tachycardia checkout gear, described method comprises the steps:

Step S1, active electrocardioelectrode are attached near the human heart, and EGC sensor is measured the electrocardiosignal that gathers the patient, sends into amplifilter filtering, then are sent to the transmission interface circuit through analog-to-digital conversion module and output to blood processor;

The signal of the active electrocardioelectrode output that step S2, receiving interface circuit receive, and be sent to the ventricular tachycardia detection module also is sent to the ventricular tachycardia detection module with reference to the signal of electrocardio module; The ventricular tachycardia detection module send respectively display module, memory module and warning circuit through after the comparison process with data.

As a preferred embodiment of the present invention, described ventricular tachycardia detection module adopts MLMS algorithm filtering electrocardio interference component, sets the electrocardiosignal that gathers and is:

d _j＝b _j+h _j'+n _j' （1）

Wherein, b _jCollection value for signal center's electricity composition; h _j' be the electrocardio composition that transmits by body wall; n _j' for the random noise of primary input end; And the electrocardiosignal of reference input access gathers from apex of the heart position, for:

x _j＝h _j+n _j （2）

Wherein, h _jBe electrocardio reference signal collection value; n _jBe the noise in the reference signal;

If n _j, n _j' and b _jFor incoherent mutually, and they and h _j, h _j' also uncorrelated, the fundamental equation that can obtain thus self-adapted noise elimination sound device is:

e _j＝d _j-y _j （3）

Determine y _jEquation decided by the adaptive algorithm that adopts; Adopt the MLMS algorithm, its recurrence equation is

e _j＝d _j-W _j-1 ^TX _j （4）

G _j＝2μ/[1+2μX _j ^TX _j] （5）

W _j＝W _j-1+G _je _jX _j （6）

Wherein, W _jBe j self adaptation weight vector constantly; Set it and be p rank vector, establish

W _j=[W _j0,W _j1,......,W _j,p-1] ^T

And X _jBe the input signal vector of sef-adapting filter, for: X _j=[X _j, X _J-1..., X _J-(p-1)] ^T

In described ventricular tachycardia detection module, after the electrocardiosignal filtering interfering, adopt the probability density function method, according to the probability density function curve shape of distance between two points behind the electrocardiosignal phase space reconfiguration and extract characteristic parameter k _n, utilize characteristic parameter k _nCan accurately detect ventricular tachycardia.

Beneficial effect of the present invention is: ventricular tachycardia checkout gear and detection method thereof that the present invention proposes, adopt the processing of circuit electrocardiogram (ECG) data of low-power consumption miniaturization, its circuit function is strong, low in energy consumption, reliability is high, and adopt the probability density function method, according to the probability density function curve shape of distance between two points behind the electrocardiosignal phase space reconfiguration and extract characteristic parameter k _n, utilize characteristic parameter k _nCan accurately detect ventricular tachycardia.Whole device volume is very small and exquisite, has realized portable requirement, can finish automatic detection, the data storage of electrocardiogram acquisition, processing, ventricular tachycardia, and the real-time monitoring and the warning that realize ventricular tachycardia.

Description of drawings

Fig. 1 is microminiature ventricular tachycardia structure of the detecting device schematic block diagram of the present invention;

Fig. 2 is band pass filter circuit figure in the microminiature ventricular tachycardia checkout gear of the present invention;

Fig. 3 is notch filter circuit figure in the microminiature ventricular tachycardia checkout gear of the present invention;

Fig. 4 is the chip schematic diagram of ventricular tachycardia detection module in the microminiature ventricular tachycardia checkout gear of the present invention;

Fig. 5 is sound and light alarm module circuit diagram in the microminiature ventricular tachycardia checkout gear of the present invention.

The specific embodiment

Describe the preferred embodiments of the present invention in detail below in conjunction with accompanying drawing.

Embodiment one

See also Fig. 1, the present invention has disclosed a kind of microminiature ventricular tachycardia checkout gear, comprise active electrocardioelectrode 10, the blood processor 20 that can communicate by letter with described active electrocardioelectrode 10, active electrocardioelectrode 10 is attached near the human heart, gather electrocardiosignal through after adjusting conversion, send into by interface circuit and to carry out Check processing in the blood processor 20, send status signal.

Described active electrocardioelectrode 10 can be attached to human body surface, usually can be worn on patient's chest or back, and it comprises EGC sensor 12, amplifilter 13, analog-to-digital conversion module 14, transmission interface circuit 15 and the first power supply circuits 11.

Wherein, described EGC sensor 12 is used for measuring the electrocardiosignal that gathers the patient, because electrocardio is the faint signal of telecommunication, so must amplify the electrocardiosignal that described EGC sensor 12 collects.

Described amplifilter 13 comprises amplifying circuit and filter circuit, and amplifying circuit is connected to the outfan of described EGC sensor 12, is used for the electrocardiosignal that EGC sensor 12 collects is carried out the difference sampling.In the present embodiment, sample rate is 250, and sampling resolution is 12Bits, and bandwidth is 25-100Hz, and amplifier stage adopts OP2832, and elementary amplification is 20 times.Filter circuit is connected to the outfan of amplifying circuit, is used for filtering direct current, High-frequency Interference and power frequency component.This filter circuit comprises band filter and notch filter, and the sequencing that both connect is not limit, and that is to say can be first by band filter filtering direct current and high frequency, again by notch filter filtering power frequency; Also can be first by carrying out again bandpass filtering after the notch filter filtering 50Hz power frequency.Described band filter is connected with described EGC sensor outfan and is used for filtering direct current and High-frequency Interference, and its circuit as shown in Figure 2.This band filter adopts unlimited gain multiple feedback type filter circuit, and it is to have in theory unlimited gain operational amplifier by one to compose the filter circuit that consists of with multiple feedback.Consisted of the basic structure of unlimited gain multiple feedback second order bandwidth-limited circuit by single operational amplifier.Unlimited gain multiple feedback type filter circuit is not owing to there being positive feedback, therefore stability is high.Amplifier adopts the LM324 of TI company, a road of four high guaily unit.The relevant parameter of described band filter is:

Passband gain $H_0=-\frac{R_4{C}_3}{R_2({\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="HDA00002206908500021.png"\; state="\{\{state\}\}">C</figure-callout>}}_2+C_3)}$

Mid frequency ${\mathrm{\&omega;}}_0=\sqrt{\frac{{\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="HDA00002206908500021.png"\; state="\{\{state\}\}">R</figure-callout>}}_2+R_3}{R_2{R}_3{R}_4{C}_2{C}_3}}$

Quality factor $\frac{{\mathrm{\&omega;}}_0}{Q}=\frac{1}{R_4}(\frac{1}{{\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="HDA00002206908500021.png"\; state="\{\{state\}\}">C</figure-callout>}}_2}+\frac{1}{C_3})$

Described notch filter is connected in this band filter outfan and is used for the filtering power frequency component, and its circuit as shown in Figure 3.This circuit is the active filter with twin-T network, its transfer function:

$A\left(S\right)=\frac{1+{\left(\mathrm{sCR}\right)}^2}{1+2(2-A_0)\mathrm{SCR}+{\left(\mathrm{SCR}\right)}^2}\mathrm{Av}$

Wherein $\mathrm{Av}=\frac{R_1+R_2}{{\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="HDA00002206908500021.png"\; state="\{\{state\}\}">R</figure-callout>}}_2}$

Different from double-T shaped wave trap in the past is that this circuit is introduced amplifier U2 and formed positive feedback, to reduce resistance band, so that the amplitude on both sides increases near the stopband center frequency.Quality factor q can be regulated by rheostat Rw.The value of R and C can be determined by mid frequency f0.

$f_0=\frac{1}{2\mathrm{\&pi;RC}}$

When f0=50Hz, C and R get respectively O.068 μ F and 47k Ω; During f0=100Hz, C and R get respectively 0.068 μ F and 24k Ω.

Described analog-to-digital conversion module 14 is connected to the outfan of described wave filter, is used for filtered signal is carried out analog digital conversion to obtain the digitized electrocardiosignal.This analog-to-digital conversion module can adopt the super low-power consumption MSP430-1471 of TI company to realize, this chip has 12 A/D, can directly realize the digitized processing of electrocardiosignal.

Described transmission interface circuit 15 is used for sending described digital electrocardiosignal, and it is connected with described analog-to-digital conversion module, can adopt the RS232 interface of MSP430-1471.

Described the first power supply circuits 11 are used for to described EGC sensor 12, amplifier, filter circuit, analog-to- digital conversion module 14 and 15 power supplies of transmission interface circuit, and it can adopt battery powered.

Described blood processor 20 comprises receiving interface circuit 22, with reference to electrocardio module 24, ventricular tachycardia detection module 23, display module 25, memory module 26, warning circuit and the second power supply circuits 21.

Described receiving interface circuit 22 is used for receiving the digital electrocardiosignal that described transmission interface circuit 11 sends, and this transmission interface circuit 11 is connected with the receiving interface circuit and is adopted shielded cable to connect.Described be used for providing with reference to electrocardio module 24 eliminate electrocardio and disturb required reference signal.Described ventricular tachycardia detection module 23 simultaneously with described with reference to electrocardio module 24 be connected receiving interface circuit 22 and be connected, it is used for eliminating the interference component of the digital electrocardiosignal that accesses, the digital electrocardiosignal that it receives described receiving interface circuit 22 according to adaptive algorithm and the described reference cardiechema signals that accesses with reference to electrocardio module 24 are processed, to eliminate the interference component in the described digital electrocardiosignal.

See also Fig. 4, this ventricular tachycardia detection module 23 adopts the ADSP-BF518F chip of AD company, this chip has powerful data processing function, can easily finish the complicated calculations such as self adaptation electrocardio noise cancelling alorithm, as shown in Figure 4, the receiving interface circuit receive 22 to digital electrocardiosignal send into the primary input end of ADSP-BF518F chip, and sent into the reference input of ADSP-BF518F chip by the reference cardiechema signals of reference electrocardio module 24 accesses.Owing to initial electrocardiosignal is gathered by chest surface skin, this initial electrocardiosignal is mixed with a lot of interference the such as electromyographic signal, and the frequency spectrum between electrocardiosignal and the interference has a wide range of overlapping, uses common filtering method effectively it not to be eliminated.Therefore, the ADSP-BF518F chip adopts MLMS algorithm filtering electrocardio interference component, and the electrocardiosignal that even gathers is:

d _j＝b _j+h _j'+n _j' （1）

Wherein, b _jCollection value for signal center's electricity composition; h _j' be the electrocardio composition that transmits by body wall; n _j' for the random noise of primary input end.And the electrocardiosignal of reference input access gathers from apex of the heart position, for:

x _j＝h _j+n _j （2）

Wherein, h _jBe electrocardio reference signal collection value; n _jBe the noise in the reference signal.

If n _j, n _j' and b _jFor incoherent mutually, and they and h _j, h _jAlso uncorrelated, the fundamental equation that can obtain thus self-adapted noise elimination sound device is:

e _j＝d _j-y _j （3）

Determine y _jEquation decided by the adaptive algorithm that adopts.Adopt the MLMS algorithm, its recurrence equation is

e _j=d _j-W _j-1 ^TX _j （4）

20G _j＝2μ/[1+2μX _j ^TX _j] （5）

W _j＝W _j-1+G _je _jX _j （6）

In the formula, W _jBe j self adaptation weight vector constantly.If it is p rank vectors, establish

W _j=[W _j0,W _j1,......,W _j,p-1] ^T

And X _jBe the input signal vector of sef-adapting filter, for: X _j=[X _j, X _J-1..., X _J-(p-1)] ^T

In described ventricular tachycardia detection module, the electrocardiosignal filtering disturb after, adopt the probability density function method, according to the probability density function curve shape of distance between two points behind the electrocardiosignal phase space reconfiguration and extract characteristic parameter k _n, utilize characteristic parameter k _nCan accurately detect ventricular tachycardia.

Described display module 25 is connected with described ventricular tachycardia detection module 23, is used for showing in real time that the digital electrocardiosignal of having eliminated interference is in order to carry out cardioelectric monitor.Described memory module 26 is connected with described ventricular tachycardia detection module 23, and it is used for storage and has eliminated the digital electrocardiosignal of disturbing, and this memory module 26 comprises the SD card that can store information.Described the second power supply circuits 21 are used for to described receiving interface circuit 22, ventricular tachycardia detection module 23 and display module 25 power supplies, it can adopt battery powered, because ADSP-BF518F chips etc. adopt the voltage of 3.3V, and the voltage that two joint AA batteries provide is 2.4V, so power supply circuits are provided with booster circuit, for example, adopt the Mc34063 of Linear Tech, output voltage is 3.3V.Be simplicity of illustration, the line of the second power supply circuits shown in Fig. 1 and each parts is not shown.

Described warning circuit comprises acoustic alarm module 27 and light alarm module 28, and its circuit as shown in Figure 5.

In addition, described blood processor 20 also be provided with for is connected for the electrocardio monitoring button of user operation and with this electrocardio monitoring button and according to push button signalling with filtering interference component electrocardiosignal or offered the handover module etc. of described display module 25 by the electrocardiosignal that described receiving interface circuit accesses.

In sum, ventricular tachycardia checkout gear and detection method thereof that the present invention proposes, adopt the processing of circuit electrocardiogram (ECG) data of low-power consumption miniaturization, its circuit function is strong, low in energy consumption, reliability is high, and adopt the probability density function method, according to the probability density function curve shape of distance between two points behind the electrocardiosignal phase space reconfiguration and extract characteristic parameter k _n, utilize characteristic parameter k _nCan accurately detect ventricular tachycardia.Whole device volume is very small and exquisite, has realized portable requirement, can finish automatic detection, the data storage of electrocardiogram acquisition, processing, ventricular tachycardia, and the real-time monitoring and the warning that realize ventricular tachycardia.

Here description of the invention and application is illustrative, is not to want with scope restriction of the present invention in the above-described embodiments.Here the distortion of disclosed embodiment and change is possible, and the various parts of the replacement of embodiment and equivalence are known for those those of ordinary skill in the art.Those skilled in the art are noted that in the situation that do not break away from spirit of the present invention or substitutive characteristics, and the present invention can be with other form, structure, layout, ratio, and realize with other assembly, material and parts.In the situation that do not break away from the scope of the invention and spirit, can carry out other distortion and change to disclosed embodiment here.

Claims (8)

1. a ventricular tachycardia checkout gear is characterized in that, described device comprises: active electrocardioelectrode, the blood processor of communicating by letter with described active electrocardioelectrode;

Described active electrocardioelectrode is attached near the human heart, gathers electrocardiosignal through after adjusting conversion, sends into and carries out Check processing in the blood processor, sends status signal;

Described active electrocardioelectrode comprises EGC sensor, amplifilter, analog-to-digital conversion module, transmission interface circuit and the first power supply circuits; EGC sensor, amplifilter, analog-to-digital conversion module, transmission interface circuit connect successively; Described EGC sensor is measured the electrocardiosignal that gathers the patient, sends into amplifilter filtering, then is sent to the transmission interface circuit through analog-to-digital conversion module and outputs to blood processor;

Described blood processor comprises the receiving interface circuit, with reference to electrocardio module, ventricular tachycardia detection module and the second power supply circuits; Described ventricular tachycardia detection module is respectively with the receiving interface circuit, be connected with reference to the electrocardio module; The signal of the active electrocardioelectrode output that the receiving interface circuit receives, all be sent to the ventricular tachycardia detection module with reference to the signal of electrocardio module, the ventricular tachycardia detection module obtains result data through after the comparison process.

2. ventricular tachycardia checkout gear according to claim 1 is characterized in that:

Described blood processor also comprises display module, memory module, the warning circuit that is connected with the ventricular tachycardia detection module; The ventricular tachycardia detection module send respectively display module, memory module and warning circuit through after the comparison process with data.

3. ventricular tachycardia checkout gear according to claim 1 is characterized in that:

Described amplifilter comprises amplifying circuit and the filter circuit of series connection;

Described filter circuit comprises band filter and the notch filter of series connection; Band filter adopts unlimited gain multiple feedback type filter circuit, is used for filtering direct current and High-frequency Interference; Described notch filter circuit is selected the active filter with twin-T network, is used for the filtering power frequency component.

4. ventricular tachycardia checkout gear according to claim 1 is characterized in that:

Described ventricular tachycardia detection module adopts MLMS algorithm filtering electrocardio interference component, sets the electrocardiosignal that gathers and is:

d _j＝b _j+h _j′+n _j' （1）

Wherein, b _jCollection value for signal center's electricity composition; h _j' be the electrocardio composition that transmits by body wall; n _j' for the random noise of primary input end; And the electrocardiosignal of reference input access gathers from apex of the heart position, for:

x _j＝h _j+n _j （2）

Wherein, h _jBe electrocardio reference signal collection value; n _jBe the noise in the reference signal;

If n _j, n _j' and b _jFor incoherent mutually, and they and h _j, h _j' also uncorrelated, the fundamental equation that can obtain thus self-adapted noise elimination sound device is:

e _j＝d _j-y _j （3）

Determine y _jEquation decided by the adaptive algorithm that adopts; Adopt the MLMS algorithm, its recurrence equation is

e _j＝d _j-W _j-1 ^TX _j （4）

G _j＝2μ/[1+2μX _j ^TX _j] （5）

W _j＝W _j-1+G _je _jX _j （6）

Wherein, W _jBe j self adaptation weight vector constantly; Set it and be p rank vector, establish

W _j=[W _j0,W _j1,......,W _j,p-1] ^T

And X _jBe the input signal vector of sef-adapting filter, for: X _j=[X _j, X _J-1..., X _J-(p-1)] ^T

In described ventricular tachycardia detection module, after the electrocardiosignal filtering interfering, adopt the probability density function method, according to the probability density function curve shape of distance between two points behind the electrocardiosignal phase space reconfiguration and extract characteristic parameter k _n, utilize characteristic parameter k _nCan accurately detect ventricular tachycardia.

5. ventricular tachycardia checkout gear according to claim 1 is characterized in that:

Described transmission interface circuit is connected shielded cable to connect with the receiving interface circuit.

6. ventricular tachycardia checkout gear according to claim 1 is characterized in that:

Described warning circuit comprises acoustic alarm module and light alarm module.

7. the detection method of the described ventricular tachycardia checkout gear of claim 1 is characterized in that, described method comprises the steps:

Step S1, active electrocardioelectrode are attached near the human heart, and EGC sensor is measured the electrocardiosignal that gathers the patient, sends into amplifilter filtering, then are sent to the transmission interface circuit through analog-to-digital conversion module and output to blood processor;

The signal of the active electrocardioelectrode output that step S2, receiving interface circuit receive, and be sent to the ventricular tachycardia detection module also is sent to the ventricular tachycardia detection module with reference to the signal of electrocardio module; The ventricular tachycardia detection module send respectively display module, memory module and warning circuit through after the comparison process with data.

8. detection method according to claim 7 is characterized in that:

Described ventricular tachycardia detection module adopts MLMS algorithm filtering electrocardio interference component, sets the electrocardiosignal that gathers and is:

d _j＝b _j+h _j'+n _j' （1）

Wherein, b _jCollection value for signal center's electricity composition; h _j' be the electrocardio composition that transmits by body wall; n _j' for the random noise of primary input end; And the electrocardiosignal of reference input access gathers from apex of the heart position, for:

x _j＝h _j+n _j （2）

Wherein, h _jBe electrocardio reference signal collection value; n _jBe the noise in the reference signal;

If n _j, n _j' and b _jFor incoherent mutually, and they and h _j, h _j' also uncorrelated, the fundamental equation that can obtain thus self-adapted noise elimination sound device is:

e _j＝d _j-y _j （3）

Determine y _jEquation decided by the adaptive algorithm that adopts; Adopt the MLMS algorithm, its recurrence equation is

e _j＝d _j-W _j-1 ^TX _j （4）

G _j＝2μ/[1+2μX _j ^TX _j] （5）

W _j＝W _j-1+G _je _jX _j （6）

Wherein, W _jBe j self adaptation weight vector constantly; Set it and be p rank vector, establish

W _j=[W _j0,W _j1,......,W _j,p-1] ^T

And X _jBe the input signal vector of sef-adapting filter, for: X _j=[X _j, X _J-1..., X _J-(p-1)] ^T

In described ventricular tachycardia detection module, after the electrocardiosignal filtering interfering, adopt the probability density function method, according to the probability density function curve shape of distance between two points behind the electrocardiosignal phase space reconfiguration and extract characteristic parameter k _n, utilize characteristic parameter k _nCan accurately detect ventricular tachycardia.

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