CN102974039A - Defibrillator output stage with H bridge circuit and diphase sawtooth square wave defibrillation high-voltage discharge method - Google Patents
Defibrillator output stage with H bridge circuit and diphase sawtooth square wave defibrillation high-voltage discharge method Download PDFInfo
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Abstract
The invention belongs to the technical field of medical electronics and particularly relates to an output stage circuit for a cardiac defibrillator and a diphase sawtooth square wave high-voltage discharge method based on the output stage circuit. The output stage circuit consists of an energy storage capacitor, an inductance coil, a semiconductor diode, a current sensor and four control switches, wherein the four control switches form an H bridge type discharge circuit. According to the high-voltage discharge method, electrical energy in the energy storage capacitor conducts a rapid high-voltage shock discharge on a patient in a diphase sawtooth wave pulse form through a defibrillation electrode so as to terminate ventricular fibrillation in a body, and conduct a timely rescue for the patient via the defibrillator output stage with the H bridge circuit according to a preset switch combination of the bridge circuit and a control strategy. The high-voltage defibrillation discharge in a diphase sawtooth square wave form provides the patient with the individual and accurately controlled defibrillation electrical energy, the success rate of the synchronization defibrillation of myocardial cells throughout a ventricle is increased, and injuries to myocardia in a high-voltage defibrillation process are reduced.
Description
Technical field
The invention belongs to the medical electronics technical field, be specifically related to a kind of output-stage circuit for cardiac defibrillator, and based on the electrion method of this output-stage circuit.
Background technology
Cardiac sudden death (SCD) is to reach to asystole in the unexpected type circulation collapse that immediately occuring in 1 hour appears in clinical symptoms, is the major causes of death of cardiovascular disease.The epidemiological study result at U.S. health statistics center shows that surpassing 50% in all cardiovascular deaths is SCD, and the SCD sum of annual China is more than 54.4 ten thousand examples; Simultaneously in the past few decades, along with the generation of aged tendency of population process SCD is on the rise.Wherein, 80% SCD is owing to malignant ventricular arrhythmia, such as ventricle vibration (VF is called for short the chamber and quivers).Wait the malignant ventricular arrhythmia outbreak often without omen owing to quiver in the chamber, the electrical activity of ventricle loses synchronicity during outbreak, and the cardiac pumping function forfeiture takes measures to turn the multiple rhythm of the heart as untimely, will cause within several minutes dying suddenly.And this wherein to surpass quiver patient's morbidity place, 90% chamber be outside hospital, often can't in time obtain treatment.So, within the short as far as possible time, stop the chamber and quiver, recover the normal heart rhythm and pace of moving things, recover hemodynamic stability, be to avoid and effectively prevent the top priority that SCD occurs.At present, unique a kind of method that can effectively stop myocardium fibrillation is electric defibrillation (ED is called for short defibrillation) clinically, namely heart is carried out the High Voltage electric shock, makes the myocardial cell repolarization, gets back to affective state separately, restarts normally to beat.The appearance of automated external defibrillator (AED) makes outside the hospital early stage defibrillation become possibility, and the intelligent characteristic of its " automatically identification, automatic analysis, automatic defibrillation " becomes simple by the electric defibrillation operation, the amateur common people also can take on the spot in time SCD patient is implemented the defibrillation rescue, shorten rescue time, improve the rescue survival rate of SCD.
The electric current that defibrillator discharges should be the minimum energy of can the chamber of termination quivering, and the threshold current of general adult's electric defibrillation is 10～25 amperes, and energy is 50～300 joules.Energy is excessive or electric current is too high not only can cause myocardial damage and skin burn, and can be larger to organic heart damages such as ischemic hearts.The electric energy of defibrillator output finally is to be discharged into it the patient by certain discharge waveform.Therefore, in order to reduce the excessive side effect of myocardial damage and defibrillation, Chinese scholars has been carried out a large amount of research to defibrillation charging method and waveform, once and some discharge waveforms that using comprise: single-phase damping sinusoidal wave, single-phase index chopped wave, two-phase index chopped wave, burst pulse array two-phase index chopped wave etc.Experimentation confirms that the required potential gradient meansigma methods of cardiac muscle only be 1/2 of single-phase ripple during defibrillation with biphasic wave, the 360 joule decreases to 200 of required defibrillation energy during accordingly also by the single-phase DC defibrillation joule.This shows that when applying equal defibrillation energy on an equal basis, the success rate of two-phase ripple is far above single-phase ripple.At present, medical circle not yet has generally acknowledged conclusion for the electrophysiological mechanism of defibrillation technology, defibrillator on the market or AED mostly are the two-phase defibrillation ripple of exponential damping type, make every effort to when guaranteeing the higher synchronous defibrillation success rate of myocardial cell, realize the damage minimum to heart with the discharge energy of minimum as far as possible.
The breast impedance of general human body is about 20～150 ohm, there is larger individual variation, existing defibrillator changes discharge inception voltage amplitude or the discharge waveform width of two-phase defibrillation ripple usually according to the breast impedance magnitude that measures, and reaches discharge energy self adaptation regulation and control.The described defibrillation charging method of Chinese patent 200510120801.2A " Waveform generating method of defibrillation two-phase ripple ", its waveform parameter comprises fixing pulse period and adjustable discharge inception voltage.Chinese patent 200580047116.A " automated external defibrillator (AED) with the discrete sensing pulse that in forming the treatment biphasic waveform, uses ", this sensing pulse is used for determining patient's the special parameters such as breast impedance before discharging defibrillation waveform, and based on this parameter adjustment discharge waveform.Chinese patent 200710046179.4A " realizes method and the device of low energy defibrillation " with burst pulse be when the discharge waveform of defibrillation is two-phase index truncation exponential wave, and each pulsewidth of clicking is adjustable between 0.5ms～4ms.Chinese patent 200910061191.1 " Intelligent intermediate-frequency bi-directional square wave defibrillation method " detects the breast impedance with the intermediate frequency constant current of 5KHz, and corresponding adjusting discharge waveform parameter, the patient is sent the two-phase defibrillation clump shape pulse square wave of 5KHz intermediate frequency.US Patent No. 6,671,546 and patent US6, the multiple-pulse two-phase wave technology of 493,580 disclosed a kind of similar higher frequencies is fixed the cycle of first-phase defibrillation pulse and second-phase defibrillation pulse, and biphasic waveform is divided into a plurality of narrow pulse waveforms and consists of.Although above patent reaches and all adopted two-phase defibrillation ripple, positive and anti-phase essence is to only have a ripple, is exponential damping decline form.Its main deficiency is: the spike part national highway of (1) exponential wave surpasses Defibrillator threshold, not only wastes energy but also produced easily strong stimulation to cardiac muscle generation damage; (2) the energy control deviation is larger, and the energy that defibrillator discharges is adjusted according to the breast impedance, and the difficult individuation that realizes is accurately controlled, particularly high especially the or low especially patient of impedance; (3) the spike part of exponential wave requires the capacitor energy of higher starting voltage and the defibrillation output stage of Geng Gao requirement of withstand voltage.
Summary of the invention
The object of the invention is to propose a kind of H bridge discharge circuit defibrillator output stage for cardiac defibrillator for above-mentioned the deficiencies in the prior art, and the cardiac defibrillator of using this H bridge circuit defibrillator output stage; The two-phase sawtooth square wave electrion method with boost function based on this H bridge circuit defibrillator output stage is proposed simultaneously, so that for different patients, the more defibrillation electric energy of the accurate control of individuation is provided, obtain simultaneously the discharge output voltage higher than energy-storage capacitor source voltage, the high pressure characteristics that reduces the discharge bridge circuit requires and saves device cost.
The two-phase sawtooth square wave electrion method that is used for defibrillation that the present invention proposes, namely by comprising the defibrillator output stage of a H bridge circuit, with predefined a series of bridge circuit switch combinations and control strategy, electric energy in the accumulator is with it carried out once rapidly high-voltage electric shock discharge with the impulse form of two-phase sawtooth waveforms the patient via defibrillation electrode, with this cessative aspect ventricular Fibrillation, implement the patient is in time rescued; The high pressure defibrillation discharge of above-mentioned two-phase sawtooth square waveform, provide a form to present sawtooth thin ripple to be superimposed upon defibrillation discharge current on the two-phase square wave to being in Fibrillated ventricular muscles, for the patient provides the accurately defibrillation electric energy of control of individuation, be conducive to improve the ventricle success rate of the synchronous defibrillation of myocardial cell everywhere, and effectively reduce the damage that in the high pressure defibrillation process cardiac muscle is formed.
Specifically being constructed as follows of the defibrillator output-stage circuit that the defibrillation charging method that the present invention proposes is used:
Described defibrillator output stage is made of at least one energy-storage capacitor, an inductance coil, a semiconductor diode, a current sensor and four gauge taps; Wherein, four gauge taps form H bridge-type discharge circuit (comprising positive pulse branch road and rp pulse branch road, perhaps high-pressure side branch road and low-pressure side branch road), export the defibrillation electric current of diphasic pulse to the patient via defibrillation electrode;
Described defibrillator output stage comprises an inductance coil at least, and this inductance coil is connected with the patient and consisted of H bridge circuit transverse arm;
Described defibrillator output stage comprises a semiconductor diode at least, and this diode and bridge circuit switch in parallel have the afterflow effect in the situation that switch disconnects;
Described defibrillator output stage comprises a positive (or anti-phase) the continuous current discharge electricity bridge circuit that is made of above-mentioned inductance coil and above-mentioned fly-wheel diode at least;
Described defibrillator output stage comprises a current sensor at least, and this current sensor places a certain bridge circuit branch road, the current amplitude of real-time this branch road of sensing in discharge process;
The cardiac defibrillator of utilizing above-mentioned H bridge circuit defibrillation output stage to consist of, as shown in Figure 4.Use the cardiac defibrillator of defibrillator output stage of the present invention, wherein, except the defibrillator output stage, comprise: main control module, battery module, breast impedance and electrocardiogram acquisition analysis module, human-computer interaction module and wireless communication module, also has in addition the high-voltage charging module, time-sequence control mode, comparator, D/A transducer.The high-voltage charging module provides high-tension electricity for the device output stage of quivering; Breast impedance and electrocardiogram acquisition analysis module, human-computer interaction module and wireless communication module, time-sequence control mode, D/A transducer are connected with main control module respectively, are subjected to master control module controls; The defibrillator output stage is connected with main control module, consists of H bridge circuit switch by gauge tap is interconnected in the defibrillator output stage, all is subjected to master control module controls.Above-mentioned each functional module all is connected with battery module, provides power supply by it.
Among the present invention, described cardiac defibrillator has patient's electrocardio, breast impedance physiological parameter measurement function.
Among the present invention, described cardiac defibrillator can be according to patient age, the body weight of input, or the breast impedance magnitude that detects, self adaptation are adjusted the waveform parameters such as reference interval value, positive sawtooth waveforms sum and anti-phase sawtooth waveforms sum of defibrillation discharge current amplitude.
Among the present invention, described cardiac defibrillator, the measurement of discharge current is realized by ohmage; The current value that measures and the comparison of reference value are realized that by comparator wherein reference value is to be determined by microcontroller output.
Among the present invention, described cardiac defibrillator, its control to two switches of H bridge circuit low-pressure side branch road, adjustment waveform parameter are to be realized by microcontroller (MCU).
Among the present invention, described cardiac defibrillator, its control to two switches of H bridge circuit high-pressure side branch road is to be realized by PLD (CPLD).
Among the present invention, described cardiac defibrillator, the current value that current sensor measurement obtains and the comparison of reference value are realized that by comparator wherein reference value is to be determined by microcontroller output.
Among the present invention, described cardiac defibrillator, described H bridge circuit switch comprises one or more IGBT or SCR switch.
The present invention automatically presets defibrillation discharge waveform parameter according to the shocked by electricity abnormal electrocardiogram information that detects and patient's breast impedance, and exports two-phase sawtooth square wave high-voltage electric shock electric current to the patient immediately.Current sensor in the H bridge circuit detects the amplitude of discharge current in the electric defibrillation process in real time, and compare with default current amplitude reference interval value, and then positive phase discharge bridge circuit (or anti-phase discharge bridge circuit) the rising current amplitude by the conducting energy-storage capacitor (when amplitude is lower than interval in limited time lower), perhaps the positive continuous current discharge electricity bridge circuit (or anti-phase continuous current discharge electricity bridge circuit) that consists of of conducting inductance coil and fly-wheel diode reduces current amplitude (when amplitude is higher than interval in limited time lower), obtains a defibrillation discharge current that presents two-phase sawtooth square waveform with it the patient thus; Concrete steps are as follows:
The first step, appearance can shock by electricity after the discharge of the rhythm of the heart and advise defibrillation, finish the charging of energy-storage capacitor and prepare, and set the discharge current parameter, comprise reference interval value, positive sawtooth waveforms sum and the anti-phase sawtooth waveforms sum of discharge current amplitude;
Second step, control bridge circuit switch is discharged to the patient by the positive bridge circuit by energy-storage capacitor, and the current amplitude of the inductance coil of flowing through simultaneously also progressively raises, and Real-time Feedback is to current sensor;
The 3rd step, discharge current on current sensor is elevated to the upper of preset reference interval and prescribes a time limit, disconnect positive phase discharge bridge circuit, and the positive afterflow bridge circuit that consists of by positive bridge circuit low-side switch, inductance coil and fly-wheel diode etc., inductance coil by induction carries out continuous current discharge electricity, and Real-time Feedback is to current sensor;
In the 4th step, the discharge current on current sensor is reduced to the lower of preset reference interval and prescribes a time limit, and disconnects positive continuous current discharge electricity bridge circuit, increases simultaneously a sawtooth waveforms counting, and compares with the positive sawtooth waveforms sum of presetting, and such as deficiency, then repeats for the second～four step;
The 5th step, finish positive sawtooth square wave discharge after, control bridge circuit switch, by as the second～four step, implement anti-phase sawtooth square wave discharge.
Adopt technique scheme, defibrillation waveform is not only less to patient's myocardial damage, and the synchronous defibrillation success rate that shocks by electricity also improves a lot; For patient's difference of different breast impedances, can provide the more accurate electric shock energy control of individuation; Avoided simultaneously the spike part of existing two-phase exponential wave to the requirement of the higher starting voltage of high voltage discharge circuit, the functional reliability that is conducive to reduce the cost of defibrillator electrion output stage and increases circuit.
Description of drawings
Fig. 1 is the high pressure defibrillation discharge H bridge circuit sketch map of the embodiment of the invention.
Fig. 2 is the defibrillation discharge process control flow chart of Fig. 1 embodiment.
Fig. 3 is the defibrillation discharge waveform sketch map of Fig. 1 embodiment.
Fig. 4 is automated external defibrillator device (AED) block diagram of Fig. 1 embodiment.
Fig. 5 is the defibrillation discharge waveform sketch map of Fig. 4 embodiment.
The specific embodiment
Further set forth and explanation the present invention below in conjunction with most preferred embodiment shown in the drawings:
With reference to accompanying drawing 1, a kind of two-phase sawtooth square wave electrion method for defibrillation, namely by comprising the defibrillator output stage 2 of a H bridge circuit, with predefined a series of bridge circuit switch S 1 ~ S4 combinations and control strategy, with the electric energy among the accumulator C via defibrillation electrode 3 with the impulse form 4 of two-phase sawtooth waveforms on patient body 1, (hereinafter to be referred as being equivalent to Rp) carries out once rapidly high-voltage electric shock discharge, reach cessative aspect ventricular Fibrillation with this, realize the purpose that the patient is in time rescued.The high pressure defibrillation charging method of the two-phase sawtooth square waveform of the present invention that present embodiment adopts, provide a form to present sawtooth thin ripple to be superimposed upon defibrillation discharge current on the two-phase square wave to being in Fibrillated ventricular muscles, for the patient provides the accurately defibrillation electric energy of control of individuation, be conducive to improve the ventricle success rate of the synchronous defibrillation of myocardial cell everywhere, effectively reduce simultaneously the damage that in the high pressure defibrillation process cardiac muscle is formed.Concrete formation and the feature of the defibrillator output stage that the defibrillation charging method that the present invention provides is used are as follows:
Described defibrillator output stage 2 is made of at least one energy-storage capacitor C and four gauge tap S1 ~ S4; Wherein, four gauge tap S1 ~ S4 form H bridge-type discharge circuit (comprising at least positive phase discharge bridge circuit S1-L-Rp-S3 and anti-phase discharge bridge circuit S2-Rp-L-S4), via the defibrillation electric current of defibrillation electrode 3 to patient's 1 output diphasic pulse;
Described defibrillator output stage 2 comprises an inductance coil L at least, and this inductance coil is connected with patient Rp and consisted of H bridge circuit transverse arm;
Described defibrillator output stage 2, (D1～D4), this diode and bridge circuit switch in parallel have the afterflow effect in the situation that switch disconnects to comprise at least a semiconductor diode;
Described defibrillator output stage 2 comprises a positive (or anti-phase) the continuous current discharge electricity bridge circuit (L-Rp-S3-D4, or L-Rp-S4-D3) that is made of above-mentioned inductance coil L and above-mentioned fly-wheel diode L at least;
Described defibrillator output stage 2 comprises a current sensor (R at least
S+, R
S-), this current sensor places a certain bridge circuit branch road, the current amplitude IP of real-time this branch road of sensing in discharge process;
With reference to accompanying drawing 2 and 3, the electrion method of utilizing above-mentioned H bridge circuit defibrillation output stage to realize, namely according to the shocked by electricity abnormal electrocardiogram information that detects and patient's breast impedance, automatically preset the defibrillation discharge waveform parameter (interval Imax+～Imin+ of positive current reference, anti-phase Imax-～Imin-, positive sawtooth waveforms sum M and anti-phase sawtooth waveforms sum N), and export two-phase sawtooth square wave high-voltage electric shock electric current (I to the patient immediately
P).It is characterized in that the current sensor (R in the H bridge circuit
S+, R
S-) detect in real time the amplitude of discharge current in the electric defibrillation process, and compare with default current amplitude reference interval value, and then the positive phase discharge bridge circuit (S1-L-Rp-S3 by the conducting energy-storage capacitor, or anti-phase discharge bridge circuit S2-Rp-L-S4) rising current amplitude (when amplitude is lower than interval lower prescribing a time limit), the perhaps positive continuous current discharge electricity bridge circuit (L-Rp-S3-D4 that consists of of conducting inductance coil and fly-wheel diode, or the anti-phase continuous current discharge electricity bridge circuit of L-Rp-S4-D3) reduces current amplitude (when amplitude is higher than interval in limited time lower), obtain a defibrillation discharge current that presents two-phase sawtooth square waveform with it the patient thus; Its step is as follows:
At first, appearance can be shocked by electricity after the rhythm of the heart and the advise defibrillation discharge, finishing the charging of energy-storage capacitor prepares, and setting discharge current parameter, the reference interval value (the interval Imax+～Imin+ of positive current reference, anti-phase Imax-～Imin-), positive sawtooth waveforms sum M and the anti-phase sawtooth waveforms sum N that comprise the discharge current amplitude;
Secondly (
t 0 Constantly), control bridge circuit switch is discharged to the patient by positive bridge circuit (S1-L-Rp-S3) by energy-storage capacitor, and the current amplitude of the inductance coil of flowing through simultaneously also progressively raises, and Real-time Feedback is to current sensor R
S+ on;
Again (
t 1 Constantly), as current sensor R
S+ on discharge current (I
P) be elevated to upper in limited time (Imax+) in preset reference interval, disconnect positive phase discharge bridge circuit, and by the positive afterflow bridge circuit that positive bridge circuit low-side switch, inductance coil and fly-wheel diode etc. consist of, carry out continuous current discharge electricity by the inductance coil of responding to, and Real-time Feedback is to current sensor;
The 4th (
t 2 Constantly), discharge current on current sensor is reduced to lower in limited time (Imin-) in preset reference interval, disconnect positive continuous current discharge electricity bridge circuit (L-Rp-S3-D4), increase simultaneously a sawtooth waveforms counting (m+1), and with default positive sawtooth waveforms sum (M ratio), such as deficiency, then repeated for the 2nd～4 step;
The 5th, finish positive sawtooth pulse discharge after (
t 3 Constantly), control bridge circuit switch, by similar the 2nd～4 step implement anti-phase sawtooth pulse discharge (
t 4 ～t 6 Constantly).
With reference to accompanying drawing 4, adopt the embodiment of automated external defibrillator device of the present invention (AED) block diagram, its system constitutes: the main control module 8 based on the MSP microprocessor is core, is connected respectively to the functional modules such as the physiological parameter acquisition modules 5 such as electrocardio and breast impedance, human-computer interaction module 6, wireless communication module 7, high-voltage charging module 10, defibrillation discharge H bridge circuit module 18 by the corresponding interface; The unification of above-mentioned functions module is by lithium battery 9 power supply, and all places in the airtight frivolous high strength portable box body, is connected to patient body 1 by two defibrillation electrodes 3.Above-mentioned AED device can be operated in the daily circulation self check state of battery saving mode and the electric defibrillation duty of first aid pattern.During the electric defibrillation duty, each module work is controlled and is coordinated in its primary control program or embedded OS unification, comprise: preset the accurate discharge waveform parameter of Extraordinary according to mensuration patient chest impedance information, in case patient's to be rescued ecg information passes through continuously automatic analysis, its result presents in the time of can shocking by electricity the rhythm of the heart, primary control program will send immediately charging instruction and according to the two-phase sawtooth square wave electrion method that the present invention provides, carry out the high-voltage electric shock defibrillation and rescue; In addition in whole rescue process, above-mentioned AED device with auxiliary in sound and light prompt, substep instructs the rescuer to finish a series of save operations such as " being placed with electric shock, artificial respiration, CPR external chest compression, defibrillation discharge ", said apparatus also can rescue whole defibrillation the information such as ecg information, control instruction and device parameter of event and all deposit, and is used for carrying out event replay and analysis by wireless communication module output afterwards.Wherein, type selecting and the working method of described each main hardware part of defibrillation discharge H bridge circuit output stage are as follows:
Described output stage H bridge circuit 18 high side switch (S1, S2) are selected IGBT, and low-side switch (S3, S4) is selected thyrister form SCR switch, and S5 is the electronics select switch, and (S1 ~ S4) respectively arrange one overlaps current driver 14～17 to H bridge circuit switch simultaneously;
Described main control module 8 is take the Low Power High Performance microprocessor MSP 430 of TI company as core, the sdram memory reservoir of expanding clock, 16MB, the Flash memorizer of 1GB, 1.8V, 3.3V, ± circuit units such as 5V power supply, and UART, IIC, USB, JTAG, GPIO and such as peripheral interfaces such as Radio infrareds;
Described time-sequence control mode 13 is take the CPLD of XLINX company as core, by connecting an electronic comparator 12, compare continuously the current reference value of main control module 8 settings and the bridge circuit discharge current value that actual measurement is arrived, and then adjust and control the switching of high side switch (S1 or S2).
With reference to accompanying drawing 5, the main control module 8 of above-mentioned AED device is based on the discharge waveform parameter of setting, the directly switching of control low-side switch (S1 or S2), and by CPD time-sequence control mode 13 indirectly control high side switch (S3, S4) switching, thereby implement H bridge circuit defibrillation charging method of the present invention, realize exporting the discharge current that is the sawtooth square-wave waveform in the certain amplitude scope to the patient; The final realization saved patient's valuable life to quiver patient's fast effective electric defibrillation of chamber.
In the above-described embodiments, the contents such as the functional module such as the physiological parameter acquisition modules 5 such as the electrocardio of AED electric defibrillation device and breast impedance, human-computer interaction module 6, wireless communication module 7, high-voltage charging module 10, electrode 3, drive circuit 14～17 and electrocardio automatic analysis and identification, each module communication agreement and primary control program, the auxiliary rescue method of CPR are not contents of the present invention, do not elaborate so provide, specifically can realize with reference to correlation technique data and existing defibrillation Apparatus and system.
Claims (9)
1. a H bridge electrion road defibrillator output stage is characterized in that: be made of at least one energy-storage capacitor, an inductance coil, a semiconductor diode, a current sensor and four gauge taps; Wherein, four gauge taps form H bridge-type discharge circuit: comprise positive pulse branch road and rp pulse branch road, perhaps high-pressure side branch road and low-pressure side branch road are exported the defibrillation electric current of diphasic pulse to the patient via defibrillation electrode;
Described defibrillator output stage comprises an inductance coil at least, and this inductance coil is connected with the patient and consisted of H bridge-type discharge circuit transverse arm;
Described defibrillator output stage comprises a semiconductor diode at least, and the switch in parallel of this semiconductor diode and H bridge-type discharge circuit has the afterflow effect in the situation that switch disconnects;
Described defibrillator output stage comprises the positive or the anti-phase continuous current discharge electricity bridge circuit that are made of above-mentioned inductance coil and above-mentioned semiconductor diode at least;
Described defibrillator output stage comprises a current sensor at least, and this current sensor places a certain bridge circuit branch road, the current amplitude of real-time this branch road of sensing in discharge process.
2. one kind with the cardiac defibrillator of H bridge circuit defibrillator output stage as claimed in claim 1, described cardiac defibrillator comprises: main control module is microcontroller, battery module, breast impedance and electrocardiogram acquisition analysis module, human-computer interaction module and wireless communication module, characterized by further comprising as claimed in claim 1 defibrillator output stage, also has in addition the high-voltage charging module, time-sequence control mode, comparator, the D/A transducer; The high-voltage charging module provides high-tension electricity for the device output stage of quivering; Breast impedance and electrocardiogram acquisition analysis module, human-computer interaction module and wireless communication module, time-sequence control mode, D/A transducer are connected with main control module respectively, are subjected to master control module controls; The defibrillator output stage is connected with main control module, consists of H bridge circuit switch by gauge tap is interconnected in the defibrillator output stage, all is subjected to master control module controls.
3. one kind based on the two-phase sawtooth waveforms defibrillation charging method with boost function of H bridge circuit defibrillator output stage as claimed in claim 1, i.e. defibrillator output stage by H bridge circuit claimed in claim 1, with predefined a series of bridge circuit switch combinations and control strategy, electric energy in the accumulator is carried out once rapidly high-voltage electric shock discharge via defibrillation electrode with the impulse form of two-phase sawtooth waveforms, and concrete steps are:
The first step, appearance can shock by electricity after the discharge of the rhythm of the heart and advise defibrillation, finish the charging of energy-storage capacitor and prepare, and set the discharge current parameter, comprise reference interval value, positive sawtooth waveforms sum and the anti-phase sawtooth waveforms sum of discharge current amplitude;
Second step, control bridge circuit switch is discharged to the patient by the positive bridge circuit by energy-storage capacitor, and the current amplitude of the inductance coil of flowing through simultaneously also progressively raises, and Real-time Feedback is to current sensor;
The 3rd step, discharge current on current sensor is elevated to the upper of preset reference interval and prescribes a time limit, disconnect positive phase discharge bridge circuit, and the positive afterflow bridge circuit that consists of by positive bridge circuit low-side switch, inductance coil and fly-wheel diode etc., inductance coil by induction carries out continuous current discharge electricity, and Real-time Feedback is to current sensor;
In the 4th step, the discharge current on current sensor is reduced to the lower of preset reference interval and prescribes a time limit, and disconnects positive continuous current discharge electricity bridge circuit, increases simultaneously a sawtooth waveforms counting, and compares with the positive sawtooth waveforms sum of presetting, and such as deficiency, then repeats for the second～four step;
The 5th step, finish positive sawtooth square wave discharge after, control bridge circuit switch, by as the second～four step, implement anti-phase sawtooth square wave discharge.
4. cardiac defibrillator as claimed in claim 2, it is characterized in that: according to patient age, the body weight of input, or the breast impedance magnitude that detects, self adaptation is adjusted reference interval value, positive sawtooth waveforms sum and the anti-phase sawtooth waveforms sum waveform parameter of defibrillation discharge current amplitude.
5. cardiac defibrillator as claimed in claim 2, it is characterized in that: the measurement of discharge current is realized by ohmage; The current value that measures and the comparison of reference value are realized that by comparator wherein reference value is to be determined by microcontroller output.
6. defibrillator as claimed in claim 2 is characterized in that: its control to two switches of H bridge circuit low-pressure side branch road, to adjust waveform parameter be to be realized by microcontroller.
7. cardiac defibrillator as claimed in claim 2, it is characterized in that: its control to two switches of H bridge circuit high-pressure side branch road is to be realized by time-sequence control mode.
8. cardiac defibrillator as claimed in claim 2 is characterized in that: the current value that current sensor measurement obtains and the comparison of reference value are realized that by comparator wherein reference value is to be determined by microcontroller output.
9. cardiac defibrillator as claimed in claim 2, it is characterized in that: described H bridge circuit switch comprises one or more IGBT or SCR switch.
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