CN101917027B - Charging system for defibrillator - Google Patents
Charging system for defibrillator Download PDFInfo
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- CN101917027B CN101917027B CN201010216917A CN201010216917A CN101917027B CN 101917027 B CN101917027 B CN 101917027B CN 201010216917 A CN201010216917 A CN 201010216917A CN 201010216917 A CN201010216917 A CN 201010216917A CN 101917027 B CN101917027 B CN 101917027B
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Abstract
The invention discloses a charging system for a defibrillator, which belongs to the technical field of the protection and application of medical equipment and is used for solving the problems of incomplete equipment protective measure, low charging efficiency, low charging speed, low charging accuracy and the like existing in the conventional charging system for the defibrillator. The charging system comprises a charging control circuit, a driving circuit, a power supply, an energy converter, a metal oxide semiconductor (MOS) switch, a high-voltage diode, an energy storage capacitor, a primary current detection circuit, a secondary current detection circuit, an energizing frequency adjusting circuit, a charging speed control circuit, a first high-voltage sampling circuit, a digital converting circuit, a charging switch control circuit, a second high-voltage sampling circuit, a voltage comparison circuit, an energy setting circuit, a hardware shut-off circuit, a third high-voltage sampling circuit and an over-voltage shut-off circuit. The charging system provided by the invention solves problems existing in the conventional charging system for the defibrillator and can fully ensure the safeties of patients and equipment in defibrillation treatment.
Description
Technical field
The invention belongs to Medical Devices protection and applied technical field, relate in particular to a kind of charging system that is used for defibrillator.
Background technology
Cardiac sudden death is caused by sudden arrest of heart beat, is one of major causes of death of industrialized country.In the U.S., 300,000 people so and dead are arranged every year on average.The common arrhythmia cordis phenomenon that takes place at the beginning of the sudden arrest of heart beat is a ventricular fibrillation, and ventricular fibrillation promptly changes into cardiac arrest in a few minutes.The cardiac that heart arrest is died from the whole world every year accounts for 12% of death toll.Though the epidemiologic data in that China does not also have the cardiac of definite heart arrest has the scholar to estimate that this numeral can reach 6,000,000.Electric defibrillation is the effective ways of pernicious arrhythmia cordis such as present taking place frequently property of treatment Ventricular Tachycardia of generally acknowledging, ventricular fibrillation.
Defibrillator is a kind of emergency medical service.The U.S. has used the methods of treatment of ventricular fibrillation (VF) to improve the first aid survival rate since nineteen sixty is carried out CPR (CPR) technology, and in time adopting electric defibrillation is again the most important treatment means of treatment sudden arrest of heart beat.The U.S. is after coming into effect public's defibrillation (PAD) plan the nineties, and patient's survival rate can reach 49%.Now the U.S. automated external defibrillator (only the chamber of search quiver/acrotism property chamber speed-and the treatment of save lives was provided in the several seconds) as a basic life support (BLS) technology.Brainstrust has proposed after most of hospital realizes heart arrest takes place, to accomplish in 3 ± 1 minutes the target of defibrillation.
Fig. 1 is a defibrillator charging system schematic diagram commonly used.Among Fig. 1, the charging system of defibrillator commonly used mainly comprises: charging control circuit 1, drive circuit 4, MOS switch 7, power supply 11, energy converter 20, high-voltage diode 10 and storage capacitor 9.Wherein, drive circuit 4 is used to produce operating frequency (resonance frequency), the opening and closing state of output PWM Waveform Control MOS switch 7.Energy converter 20 is used for the electric energy that conversion electric power 11 produces, and stores in the storage capacitor 9, and charging control circuit 1 is used to control charging process.According to Fig. 1, be not difficult to find out that there is following problem in defibrillator charging system commonly used:
1, defibrillator is applied in the critical moment as first-aid apparatus; Equipment reliable and stable most important; And defibrillator charging system commonly used lacks safety precautions, and the instantaneous pressure that crucial moment, charging system produced might damage system, causes the defibrillator can't operate as normal.In Fig. 1, energy converter 20 lacks safeguard measure as the core component of charging system.When electric current is excessive in the charging system, possibly damage these parts, cause Emergency Assistance to implement.
2, the work between drive circuit and the storage capacitor lack to be coordinated, the energy of the energy converter storage capacitor that do not have enough time to be transformed into, and drive circuit just begins to vibrate next time, causes the situation that suppresses sample frequency to occur, thereby energy conversion efficiency is reduced.
3, uncontrollable charging rate can not satisfy making defibrillator reach high-octane requirement in the short time, thereby loses the valuable relief time.When patient is carried out defibrillation therapy, need in tens milliseconds, discharge the energy (external defibrillation generally is the 200-360 joule) of hundreds of joule, about the about 80A of current peak, charging system commonly used is difficult to provide so high transient energy.
4, uncontrollable charging precision can not realize energy output accurately, under the little situation of energy, does not reach the defibrillation effect, and under the big situation of energy, causes the human injury easily.When carrying out defibrillation therapy, need make defibrillator discharge energy accurately at short notice, to reach desired therapeutic effect and the safety that guarantees patient.Such as, defibrillator is used for open chest surgery, only needs the energy (medical science is stipulated less than 50 joules) of 20-30 joule; If external defibrillation then needs 200-300 Joule energy (the medical science regulation is not more than 400 joules), charging system commonly used is difficult to provide energy so accurately.
Summary of the invention
The objective of the invention is to, propose a kind of charging system that is used for defibrillator, in order to solve the problem of the defibrillator charging system existence of pointing out in the background technology commonly used.
A kind of charging system that is used for defibrillator; Comprise charging control circuit, drive circuit, power supply, energy converter, MOS switch, high-voltage diode, storage capacitor; It is characterized in that the said charging system that is used for defibrillator comprises that also primary current testing circuit, secondary current testing circuit, driving frequency adjustment circuit, charging rate control circuit, the first high pressure sample circuit, digital conversion circuit, charge switch controlling circuits, the second high pressure sample circuit, voltage comparator circuit, energy are provided with circuit, hardware breaking circuit, the 3rd high pressure sample circuit and overvoltage breaking circuit;
Said primary current testing circuit links to each other with drive circuit with the MOS switch respectively, and ground connection;
Said secondary current testing circuit is arranged in the electric capacity charge circuit, and an end links to each other with energy converter, and the other end links to each other with storage capacitor, and links to each other with driving frequency adjustment circuit;
Said driving frequency adjustment circuit links to each other with drive circuit;
Said charging rate control circuit links to each other with drive circuit with charging control circuit respectively;
The said first high pressure sample circuit links to each other with digital conversion circuit with storage capacitor respectively;
Said digital conversion circuit links to each other with charging control circuit with the first high pressure sample circuit respectively;
Said charge switch controlling circuits links to each other with drive circuit with charging control circuit respectively;
The said second high pressure sample circuit links to each other with voltage comparator circuit with storage capacitor respectively;
Said voltage comparator circuit is provided with circuit with the second high pressure sample circuit with energy respectively and links to each other;
Said energy is provided with circuit and links to each other with charging control circuit with voltage comparator circuit respectively;
Said hardware breaking circuit links to each other with drive circuit with voltage comparator circuit respectively;
Said the 3rd high pressure sample circuit links to each other with the overvoltage breaking circuit with storage capacitor respectively;
Said overvoltage breaking circuit links to each other with drive circuit with the 3rd high pressure sample circuit respectively;
Said primary current testing circuit is used to prevent that energy converter is saturated overheated;
Said secondary current testing circuit and driving frequency adjustment circuit are coordinated drive circuit works frequency and storage capacitor charged state jointly;
Said charging rate control circuit is realized the control to charging rate through regulating the duty ratio of drive circuit;
The said first high pressure sample circuit is used to gather the aanalogvoltage of storage capacitor, and sends into digital conversion circuit;
Said digital conversion circuit is used for converting the aanalogvoltage of the first high pressure sample circuit collection to digital voltage, and sends into charge switch controlling circuits;
Said charge switch controlling circuits presets first magnitude of voltage; When the digital voltage that the digital conversion circuit of receiving when charge switch controlling circuits sends is higher than first magnitude of voltage; Charge switch controlling circuits stops the charging process of storage capacitor through drive circuit control MOS switch;
The said second high pressure sample circuit is used to gather the aanalogvoltage of storage capacitor;
Said energy is provided with circuit according to setting energy output aanalogvoltage;
Said voltage comparator circuit is used for the aanalogvoltage of comparison storage capacitor and the aanalogvoltage that energy is provided with circuit output; When the aanalogvoltage of storage capacitor was higher than energy the aanalogvoltage of circuit output is set, the hardware breaking circuit overturn, and turn-offs drive circuit, thereby stops the capacitor charging process;
Said the 3rd high pressure sample circuit is used to gather the aanalogvoltage of storage capacitor;
Said overvoltage breaking circuit presets second magnitude of voltage, and when the aanalogvoltage of storage capacitor during greater than second magnitude of voltage that presets, the overvoltage breaking circuit turn-offs drive circuit, stops the capacitor charging process.
Said first magnitude of voltage is set energy value according to the doctor and is calculated.
Said second magnitude of voltage is the energy of storage capacitor storage when reaching 400 joules, the magnitude of voltage of storage capacitor.
Effect of the present invention is that the electric capacity charging voltage has independently software and hardware two cover detection and breaking circuits, makes electric capacity accurately reach demand voltage; Out-of-limit high pressure has software and hardware three covers and detects and breaking circuit, prevents that electric capacity from overcharging, and fully guarantees personnel and device security; Rechargeable energy according to being provided with is regulated charge rate automatically, in the time of guaranteeing macro-energy during to charging rate and little energy to the requirement of charging precision; Have the primary current testing circuit, prevent that energy converter is saturated, prevent system overheat, increase work efficiency; Have secondary charging testing circuit, can adjust the pulse width modulation frequency of drive circuit automatically according to the time of energy converter power conversion, thereby improve charge efficiency and speed.
Description of drawings
Fig. 1 is a defibrillator charging system schematic diagram commonly used;
Fig. 2 is the charging system schematic diagram that is used for defibrillator provided by the invention;
Fig. 3 is a charging rate control circuit fundamental diagram.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment is elaborated.Should be emphasized that following explanation only is exemplary, rather than in order to limit scope of the present invention and application thereof.
Fig. 2 is the charging system schematic diagram that is used for defibrillator provided by the invention.Among Fig. 2; The charging system that is used for defibrillator provided by the invention is on the basis of defibrillator charging system commonly used, comprises that also primary current testing circuit 6, secondary current testing circuit 8, driving frequency adjustment circuit 5, charging rate control circuit 3, the first high pressure sample circuit 17, digital conversion circuit 19, charge switch controlling circuits 2, the second high pressure sample circuit 13, voltage comparator circuit 16, energy are provided with circuit 18, hardware breaking circuit 15, the 3rd high pressure sample circuit 12 and overvoltage breaking circuit 14.
Primary current testing circuit 6 wherein links to each other with drive circuit 4 with MOS switch 7 respectively, and primary current testing circuit 6 is also wanted ground connection simultaneously.At this moment, power supply 11, energy converter 20, MOS switch 7 and primary current testing circuit 6 constitute a complete loop.Primary current testing circuit 6 is used to measure the electric current that flows through this loop in this loop.Because energy converter 20 is perceptual devices, induction reactance is bigger when switch change, and electric current increases gradually, when energy converter 20 is saturated, has only impedance (energy converter 20 dc impedances are very little) in the circuit, and this moment, electric current can be very big.Therefore, can be according to 20 electric currents that can bear of energy converter, design primary current testing circuit 6.In an embodiment, the primary current testing circuit can adopt 0.01 ohm of 5 watts of power resistor, through detecting the voltage detecting electric current at 0.01 ohm of 5 watts of power resistor two ends.When the voltage difference at 0.01 ohm of 5 watts of power resistor two ends above 200 millivolts; I.e. (20 electric currents that can bear of energy converter of defibrillator charging system commonly used are generally 20 amperes) during 20 Ampere currents; Switch-off power MOS switch prevents that thus energy converter 20 is saturated overheated.
Secondary circuit testing circuit 8 and driving frequency adjustment circuit 5 lay respectively between electric capacity charge circuit (secondary coil of energy converter 20, high-voltage diode 10, storage capacitor 9) and capacitor loop and the control loop.Specifically be, secondary current testing circuit 8 one ends link to each other with the secondary coil of energy converter 20, and the other end links to each other with storage capacitor 9, and link to each other with driving frequency adjustment circuit 5.Driving frequency adjustment circuit 5 links to each other with secondary circuit testing circuit 8 with drive circuit 4 respectively.The secondary coil of energy converter 20, high-voltage diode 10, storage capacitor 9 and secondary current testing circuit 8 constitute a loop.The first step of energy conversion be with the primary coil NE BY ENERGY TRANSFER of energy converter 20 to secondary coil, second step was to give storage capacitor 9 with the NE BY ENERGY TRANSFER of secondary coil.In second step; Though onesize energy is transmitted in each vibration; But because of capacitance voltage in storage capacitor 9 charging processes constantly raises; As long as thereby it is also different to transmit the required time of energy, but the also charging toward storage capacitor 9 the insides of energy, and secondary current testing circuit 8 just can detect electric current (power conversion intact just do not have electric current mobile).Detect (power conversion completion) when not having electric current at secondary current testing circuit 8, through driving frequency adjustment circuit 5, control Driver Circuit 4 starts charging excitation next time.When secondary current testing circuit 8 has detected electric current (energy does not convert), then do not start excitation, wait for the power conversion completion.Can avoid invalid excitation like this, guarantee that the energy of energy converter can be delivered to electric capacity fully, thereby make energy conversion efficiency the highest, realize coordinating the target of drive circuit 4 operating frequencies and storage capacitor 9 charged states.
Charging rate control circuit 3 links to each other with drive circuit 4 with charging control circuit 1 respectively, and the charging rate control circuit is by software control charging rate control voltage.Fig. 3 is a charging rate control circuit fundamental diagram, and among Fig. 3, sawtooth voltage realizes that by drive circuit is inner charging rate control voltage is high more, and the PWM duty ratio is just big more, and charging rate is just fast more.Therefore, charging rate control circuit 3 is realized the control to charging rate through regulating the duty ratio of drive circuit.
The first high pressure sample circuit 17 links to each other with digital conversion circuit 19 with storage capacitor 9 respectively; Digital conversion circuit 19 links to each other with charging control circuit 1 with the first high pressure sample circuit 17 respectively, and charge switch controlling circuits 2 links to each other with drive circuit 4 with charging control circuit 1 respectively.The first high pressure sample circuit 17 is used to gather the aanalogvoltage of storage capacitor 9, and sends into digital conversion circuit 19.Digital conversion circuit 19 is used for converting the aanalogvoltage that the first high pressure sample circuit 17 is gathered to digital voltage, and sends into charge switch controlling circuits 2 through charging control circuit 1.Charge switch controlling circuits 2 presets first magnitude of voltage, and this first magnitude of voltage is set energy value according to the doctor and calculated: general open chest surgery needs the energy of 20-30 joule, to this energy values calculating voltage value; Perhaps if external defibrillation then needs the 200-300 Joule energy, then calculate the relevant voltage value to this energy values, with the magnitude of voltage that calculates as first magnitude of voltage.When the digital voltage that the digital conversion circuit of receiving when charge switch controlling circuits 2 sends was higher than first magnitude of voltage, charge switch controlling circuits stopped the charging process of storage capacitor 9, thereby has guaranteed the precision of charging through drive circuit 4 control MOS switches.
The second high pressure sample circuit 13 links to each other with voltage comparator circuit 16 with storage capacitor 9 respectively; Voltage comparator circuit 16 is provided with circuit 18 with the second high pressure sample circuit 13 and energy respectively and links to each other; Energy is provided with circuit 18 and links to each other with charging control circuit 1 with voltage comparator circuit 16 respectively, and hardware breaking circuit 15 links to each other with drive circuit 4 with voltage comparator circuit 16 respectively.The second high pressure sample circuit 13 is used to gather the aanalogvoltage of storage capacitor 9, and energy is provided with circuit 18 according to setting energy output aanalogvoltage.Voltage comparator circuit 16 is used for the aanalogvoltage of comparison storage capacitor 9 and the aanalogvoltage that energy is provided with circuit 18 outputs; When the aanalogvoltage of storage capacitor 9 is higher than energy the aanalogvoltage of circuit 18 outputs is set; Hardware breaking circuit 15 overturns; Turn-off drive circuit, thereby stop the capacitor charging process.The second high pressure sample circuit 13, voltage comparator circuit 16, energy are provided with circuit 18 and become hardware protection part of the present invention with hardware breaking circuit 15 mutual group.The energy of medical science regulation external defibrillation must not be higher than 400 joules, and the energy that is higher than this numerical value will cause human body dead.For this reason, in the present invention, can be provided with in the circuit 18 at energy; The relevant voltage value of 400 joules of correspondences is set, and when this was worth the voltage of gathering greater than the second high pressure sample circuit 13, the energy that the charging system generation is described was above 400 joules; Turn-off drive circuit through the turning operation of hardware breaking circuit 15 this moment, thereby stop the capacitor charging process; Avoid too high energy to be carried on the patient body, reach protection patient's purpose.Certainly, energy is provided with circuit 18 and also can sets 30 joules (energy value when defibrillator is used for open chest surgery) corresponding relevant voltage value.
The 3rd high pressure sample circuit 12 links to each other with overvoltage breaking circuit 14 with storage capacitor 9 respectively, and overvoltage breaking circuit 14 links to each other with drive circuit 4 with the 3rd high pressure sample circuit 12 respectively.The 3rd high pressure sample circuit 12 and overvoltage breaking circuit 14 common realizations software protection part of the present invention.The 3rd high pressure sample circuit 12 is used to gather the aanalogvoltage of storage capacitor 9.Overvoltage breaking circuit 14 presets second magnitude of voltage, and second magnitude of voltage is the energy of storage capacitor 9 storage corresponding voltage when reaching safe extreme value.The energy security extreme value of the external defibrillation of general medicine regulation is 400 joules, corresponding voltage when therefore presetting energy that second magnitude of voltage can be set at storage capacitor 9 storages and reaching 400 joules.The aanalogvoltage of the storage capacitor of gathering when the 3rd high pressure sample circuit 12 9 is during greater than second magnitude of voltage that presets, and overvoltage breaking circuit 14 turn-offs drive circuits 4, stops the capacitor charging process.(energy value when defibrillator is used for open chest surgery) corresponding voltage when the energy that above-mentioned second magnitude of voltage also can be set at storage capacitor 9 storage reaches 30 joules.
The charging system that is used for defibrillator that the invention described above provides, having independently, software and hardware two covers detect and breaking circuit, i.e. primary current testing circuit and secondary charging testing circuit.Wherein the primary current testing circuit is used to prevent that energy converter is saturated, prevents system overheat; And secondary charging testing circuit can be adjusted the pulse width modulation frequency of drive circuit automatically according to the time of energy converter power conversion, thereby improves charge efficiency and speed.Have the charging rate control circuit, realize control charging rate.The first high pressure sample circuit can be controlled the precision of charging, thereby guarantees the patient's of enforcement defibrillation therapy safety.The second high pressure sample circuit and the 3rd high pressure sample circuit have out-of-limit high pressure software and hardware and detect and breaking circuit, prevent that electric capacity from overcharging, and fully guarantee to implement the patient and the device security of defibrillation therapy.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (3)
1. charging system that is used for defibrillator; Comprise charging control circuit, drive circuit, power supply, energy converter, MOS switch, high-voltage diode, storage capacitor; It is characterized in that the said charging system that is used for defibrillator comprises that also primary current testing circuit, secondary current testing circuit, driving frequency adjustment circuit, charging rate control circuit, the first high pressure sample circuit, digital conversion circuit, charge switch controlling circuits, the second high pressure sample circuit, voltage comparator circuit, energy are provided with circuit, hardware breaking circuit, the 3rd high pressure sample circuit and overvoltage breaking circuit;
Said primary current testing circuit links to each other with drive circuit with the MOS switch respectively, and ground connection;
Said secondary current testing circuit is arranged in the electric capacity charge circuit, and an end links to each other with energy converter, and the other end links to each other with storage capacitor, and links to each other with driving frequency adjustment circuit;
Said driving frequency adjustment circuit links to each other with drive circuit;
Said charging rate control circuit links to each other with drive circuit with charging control circuit respectively;
The said first high pressure sample circuit links to each other with digital conversion circuit with storage capacitor respectively;
Said digital conversion circuit links to each other with charging control circuit with the first high pressure sample circuit respectively;
Said charge switch controlling circuits links to each other with drive circuit with charging control circuit respectively;
The said second high pressure sample circuit links to each other with voltage comparator circuit with storage capacitor respectively;
Said voltage comparator circuit is provided with circuit with the second high pressure sample circuit with energy respectively and links to each other;
Said energy is provided with circuit and links to each other with charging control circuit with voltage comparator circuit respectively;
Said hardware breaking circuit links to each other with drive circuit with voltage comparator circuit respectively;
Said the 3rd high pressure sample circuit links to each other with the overvoltage breaking circuit with storage capacitor respectively;
Said overvoltage breaking circuit links to each other with drive circuit with the 3rd high pressure sample circuit respectively;
Said primary current testing circuit is used to prevent that energy converter is saturated overheated;
Said secondary current testing circuit and driving frequency adjustment circuit are coordinated drive circuit works frequency and storage capacitor charged state jointly; Detect when not having electric current at the secondary current testing circuit, through driving frequency adjustment circuit, control Driver Circuit starts charging excitation next time; When the secondary current testing circuit has detected electric current, then do not start excitation;
Said charging rate control circuit is realized the control to charging rate through regulating the duty ratio of drive circuit;
The said first high pressure sample circuit is used to gather the aanalogvoltage of storage capacitor, and sends into digital conversion circuit;
Said digital conversion circuit is used for converting the aanalogvoltage of the first high pressure sample circuit collection to digital voltage, and sends into charge switch controlling circuits;
Said charge switch controlling circuits presets first magnitude of voltage; When the digital voltage that the digital conversion circuit of receiving when charge switch controlling circuits sends is higher than first magnitude of voltage; Charge switch controlling circuits stops the charging process of storage capacitor through drive circuit control MOS switch;
The said second high pressure sample circuit is used to gather the aanalogvoltage of storage capacitor;
Said energy is provided with circuit according to setting energy output aanalogvoltage;
Said voltage comparator circuit is used for the aanalogvoltage of comparison storage capacitor and the aanalogvoltage that energy is provided with circuit output; When the aanalogvoltage of storage capacitor was higher than energy the aanalogvoltage of circuit output is set, the hardware breaking circuit overturn, and turn-offs drive circuit, thereby stops the capacitor charging process;
Said the 3rd high pressure sample circuit is used to gather the aanalogvoltage of storage capacitor;
Said overvoltage breaking circuit presets second magnitude of voltage, and when the aanalogvoltage of storage capacitor during greater than second magnitude of voltage that presets, the overvoltage breaking circuit turn-offs drive circuit, stops the capacitor charging process.
2. a kind of charging system that is used for defibrillator according to claim 1 is characterized in that said first magnitude of voltage sets energy value according to the doctor and calculate.
3. a kind of charging system that is used for defibrillator according to claim 1 is characterized in that said second magnitude of voltage is the energy of storage capacitor storage when reaching 400 joules, the magnitude of voltage of storage capacitor.
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| CN201010216917A CN101917027B (en) | 2010-06-25 | 2010-06-25 | Charging system for defibrillator |
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| CN201010216917A CN101917027B (en) | 2010-06-25 | 2010-06-25 | Charging system for defibrillator |
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| CN103187597B (en) * | 2011-12-30 | 2015-04-01 | 深圳迈瑞生物医疗电子股份有限公司 | Self-adaptive charge rate adjusting method and defibrillator |
| CN104548355B (en) * | 2015-01-22 | 2017-02-22 | 深圳市科曼医疗设备有限公司 | Charging protection device and method in defibrillation system |
| CN105207301A (en) * | 2015-10-16 | 2015-12-30 | 安科乐康（北京）诊断技术有限公司 | Capacitor charge protection circuit for external defibrillator and external defibrillator |
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| CN2928126Y (en) * | 2006-07-27 | 2007-08-01 | 北京麦邦光电仪器有限公司 | Quick capacitor charging circuit for defibrillator |
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| US7069075B2 (en) * | 2002-11-22 | 2006-06-27 | Medtronic, Inc. | Subcutaneous implantable cardioverter/defibrillator |
| US8401637B2 (en) * | 2004-11-24 | 2013-03-19 | Galvani, Ltd. | Medium voltage therapy applications in treating cardiac arrest |
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| CN2928126Y (en) * | 2006-07-27 | 2007-08-01 | 北京麦邦光电仪器有限公司 | Quick capacitor charging circuit for defibrillator |
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