CN201308717Y - Discharge energy compensation circuit for external defibrillator - Google Patents
Discharge energy compensation circuit for external defibrillator Download PDFInfo
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- CN201308717Y CN201308717Y CNU2008201570356U CN200820157035U CN201308717Y CN 201308717 Y CN201308717 Y CN 201308717Y CN U2008201570356 U CNU2008201570356 U CN U2008201570356U CN 200820157035 U CN200820157035 U CN 200820157035U CN 201308717 Y CN201308717 Y CN 201308717Y
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- external defibrillator
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Abstract
The utility model discloses a discharge energy compensation circuit for external defibrillator, comprising two discharge pole plates connected with human body, an excitation signal generation circuit connected with human body via the two discharge pole plates for generating current signals passing human chest, to excite chest resistance of human body, a detection circuit connected with the two discharge pole plates of the excitation signal generation circuit for transmitting and processing excited signals; and a signal collection processing device connected with the detection circuit for determining the released energy of the external defibrillator for defibrillation. The discharge energy compensation circuit can increase or decrease the initial voltage of energy storage capacitor according to the actual chest resistance of patient, thereby improving defibrillation success rate.
Description
[technical field]
This utility model relates to field of medical, particularly relates to a kind of discharge energy compensating circuit that is used for external defibrillator.
[background technology]
Ventricular fibrillation is a kind of serious cardiac symptom, is equal to asystole, and the human life in serious threat, and the measure that effectively stops ventricular fibrillation is exactly an electric defibrillation.Electric defibrillation is divided into internal defibrillation, external defibrillation, and external defibrillation is first aid means commonly used at present, and wants successful defibrillation to discharge certain energy to human body.Be that energy is stored on the electric capacity with highly compressed form in the practical operation, the pulse release with the set time width arrives human body then.Initial voltage when the size of supposing capacitor is C, defibrillation on the electric capacity is U, be that the time width of R, defibrillation pulse is τ through the breast impedance, defibrillation ENERGY E of being discharged into human body equals so:
Like this, under the identical situation of electric capacity initial voltage U, through breast impedance R difference, the energy that is discharged in identical discharge time is inevitable not to be waited.Therefore define the energy actual fed that is stored on the capacitor ratio to the human body especially through the breast impedance.
The discharge energy that a considerable amount of in the market defibrillators set all will calculate when the breast impedance is assumed to be 50 Ω, and according to zooperal data and interrelated data, may in the scope of 25 Ω～175 Ω, change through the breast impedance, when electric capacity is 240uF, when the discharge pulse overall width is 10ms, to set discharge energy is that 200J is an example, for 50 Ω through the breast impedance, release energy and be 200J, corresponding initial voltage is 1433V, but for 100 Ω through the breast impedance, identical initial voltage, discharge energy has only 139J, has had a strong impact on the defibrillation effect.For 30 Ω through the breast impedance, discharge energy can reach 231J again, energy is excessive like this can cause bigger injury and waste energy again patient body.
Therefore in practical operation, being necessary increases or reduces initial voltage on the storage capacitor according to the actual of patient through the breast impedance, makes the energy and setting energy coincidence that is discharged into human body.
[utility model content]
The purpose of this utility model is to provide a kind of discharge energy compensating circuit that is used for external defibrillator, this discharge energy compensating circuit that is used for external defibrillator when detecting defibrillation human body through the breast impedance, voltage on control and the adjustment storage capacitor, the energy that is discharged when making defibrillation varies with each individual, to reduce the influence of individual variation to the defibrillation effect.
The technical solution of the utility model can be expressed as: a kind of discharge energy compensating circuit that is used for external defibrillator comprises: discharge plate links to each other with human body; Pumping signal produces circuit, link to each other with described discharge plate and produce the current signal of the torso model of flowing through, in order to encourage human body through the breast impedance; Detecting circuit links to each other with described discharge plate, transmits and handle the signal that excitation is produced; Signal acquisition and processing apparatus links to each other with described detecting circuit, the energy of the required release of described external defibrillator when determining defibrillation.
Wherein, described pumping signal generation circuit comprises DDS (Direct Digital Synthesizer, the frequency synthesis of Direct Digital formula) circuit; The current signal that described pumping signal produces the circuit generation is the sinusoidal current signal of 30KHz; Described pumping signal produces current signal that circuit produces by the described discharge plate torso model of flowing through, and produces the correspondent voltage signal according to human body on described discharge plate through the size of breast impedance.
Described detecting circuit comprises signal amplification circuit, signal transformation circuit and low-pass filter circuit; Described signal amplification circuit is a differential amplifier circuit; Described detecting circuit is output as voltage signal, and the amplitude of this voltage signal is corresponding through the breast impedance magnitude with human body.
The energy of the required release of described external defibrillator when the signal that described signal acquisition and processing apparatus is exported according to detecting circuit, default target defibrillation energy and default discharge waveform are determined defibrillation.
The beneficial effects of the utility model are that circuit structure is simple, and measuring speed is fast, and the emergency when generation is quivered in the chamber of being applicable to can obtain patient at short notice through the breast resistance value, effectively gets rid of individual variation, improves the defibrillation success rate.
[description of drawings]
Fig. 1 is used for the block diagram of the discharge energy compensating circuit of external defibrillator for this utility model;
Fig. 2 is the block diagram that the pumping signal that is used for the discharge energy compensating circuit of external defibrillator produces circuit;
Fig. 3 is the block diagram of detecting circuit that is used for the discharge energy compensating circuit of external defibrillator;
Fig. 4 is the block diagram of signal acquisition and processing apparatus that is used for the discharge energy compensating circuit of external defibrillator;
Fig. 5 is used for the workflow diagram of the discharge energy compensating circuit of external defibrillator for this utility model.
[specific embodiment]
Below in conjunction with embodiment and with reference to accompanying drawing the present invention is further described.
Referring to Fig. 1, a kind of discharge energy compensating circuit that is used for external defibrillator comprises discharge plate 10, links to each other with human body; Pumping signal produces circuit 20, links to each other with discharge plate 10; Detecting circuit 30 links to each other with discharge plate 10; Signal acquisition and processing apparatus 40 links to each other with detecting circuit 30, the energy of the required release of described external defibrillator when determining defibrillation.Wherein, the output that pumping signal produces circuit 20 directly is connected to human body by two discharge plates 10 of defibrillator, owing to exist through the breast impedance, when flowing through torso model, electric current between two pole plates 10 of defibrillator, can set up a voltage, the frequency of this voltage is identical with power frequency, amplitude is then by the common decision of the size of electric current and thoracic impedance, and is constant from the size of current of constant-current source, so the amplitude of voltage only depends on the size through the breast impedance.The input of detecting circuit 30 is connected to two discharge plates 10 of defibrillator, and amplification of voltage signal difference and the demodulation that is based upon in the breast impedance drawn the voltage signal that can directly reflect through the nearly direct current of breast impedance magnitude.Signal acquisition and processing apparatus 40 is connected to the output of detecting circuit 30, gathers the voltage signal of detecting circuit 30 outputs, by the algorithm process of setting, calculates the offset through breast impedance and the needed electric capacity initial voltage of release target defibrillation energy.
Referring to Fig. 2, microprocessor 21 is a single-chip microcomputer.DDS circuit 22 is Direct Digital frequency synthesis chip and peripheral circuit thereof.23 of voltage-controlled current sources are a voltage---current converter circuit, its principle is to increase a follower to constitute negative feedback on the basis of the basic voltage of being built by operational amplifier one current converter circuit, the output current of this circuit is only relevant with input voltage, is not subjected to the influence of subordinate's circuit input impedance.
Referring to Fig. 3, wherein, signal amplification circuit 31 is made up of preamplifier and intergrade amplifier, and preamplifier is the amplifying circuit that an instrument amplifier constitutes, and the intergrade amplifier is made up of common operational amplifier.Waveform shaping circuit 32 adopts the rectification circuit that is made of operational amplifier and commutation diode.The active low-pass filter of low-pass filter circuit 33 for constituting by operational amplifier and resistance capacitance.
The weak voltage signal that signal amplification circuit 31 will be attached to discharge plate 10 two ends on the human body carries out the difference amplification, and common mode interference signal is suppressed effectively, guarantees to be transported to the signal quality of late-class circuit.The output of signal amplification circuit 31 is connected to the input of waveform shaping circuit 32, and waveform shaping circuit 32 changes the spectrum component of signal with the sinusoidal signal rectifying conversion.The output of waveform shaping circuit 32 is connected to low-pass filter circuit 33, leaches useful low-frequency component the signal of low-pass filter circuit 33 after shaping, and its amplitude is with corresponding one by one through the breast impedance magnitude.
Referring to Fig. 4, the analog signal conversion that analog-digital converter 41 is exported low-pass filter circuit 33 becomes digital signal and hands over to microprocessor 42 and handle.
Referring to Fig. 5, in this specific embodiment, program begins the back in step S101 initialization ancillary equipment, and the frequency in step S102 sets the DDS signal starts DDS circuit 22 composite signals in step S103, the sinusoidal signal of generation setpoint frequency then.In step S104, judge whether to have set target energy (for example, the mode of target setting energy can determine to select the energy of defibrillation for the user by button),, continue to judge otherwise return step S104 if then proceed to step S105.Among the step S105, start analog-digital converter 41, gather 120 groups of data, step S106, whether judgment data gathers is finished, and is then to enter step S107, otherwise continues to gather.After to be collected finishing, call the impedance computation program in step S107, average and the normalized with 120 groups of data of gathering, by default form finding, draw through the breast impedance, in step S108, according to releasing energy through breast impedance, target and defibrillation overall width discharge time goes out the adjusted value of electric capacity initial voltage needs according to algorithm computation.In step S109, carry out defibrillation procedure.
Thus, this utility model when detecting defibrillation human body through the breast impedance, control is also adjusted voltage on the storage capacitor, the energy that is discharged when making defibrillation varies with each individual, and has reduced the influence of individual variation to the defibrillation effect.
The above only is a preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from this utility model design; can also make some improvements and modifications, these improvements and modifications also should be considered as in the protection domain of the present utility model.
Claims (8)
1, a kind of discharge energy compensating circuit that is used for external defibrillator is characterized in that, comprises:
Discharge plate links to each other with human body;
Pumping signal produces circuit, link to each other with described discharge plate and produce the current signal of the torso model of flowing through, in order to encourage human body through the breast impedance;
Detecting circuit links to each other with described discharge plate, transmits and handle the signal that excitation is produced;
Signal acquisition and processing apparatus links to each other with described detecting circuit, the energy of the required release of described external defibrillator when determining defibrillation.
2, the discharge energy compensating circuit that is used for external defibrillator according to claim 1 is characterized in that, described pumping signal produces circuit and comprises the DDS circuit.
3, the discharge energy compensating circuit that is used for external defibrillator according to claim 1 is characterized in that, the current signal that described pumping signal produces the circuit generation is the sinusoidal current signal of 30KHz.
4, the discharge energy compensating circuit that is used for external defibrillator according to claim 1, it is characterized in that, described pumping signal produces current signal that circuit produces by the described discharge plate torso model of flowing through, and produces the correspondent voltage signal according to human body on described discharge plate through the size of breast impedance.
5, the discharge energy compensating circuit that is used for external defibrillator according to claim 1 is characterized in that described detecting circuit comprises signal amplification circuit, signal transformation circuit and low-pass filter circuit.
6, the discharge energy compensating circuit that is used for external defibrillator according to claim 5 is characterized in that, described signal amplification circuit is a differential amplifier circuit.
7, the discharge energy compensating circuit that is used for external defibrillator according to claim 1 is characterized in that described detecting circuit is output as voltage signal, and the amplitude of this voltage signal is corresponding through the breast impedance magnitude with human body.
8, according to claim 1 or the 7 described discharge energy compensating circuits that are used for external defibrillator, it is characterized in that the energy of the required release of described external defibrillator when the signal that described signal acquisition and processing apparatus is exported according to detecting circuit, default target defibrillation energy and default discharge waveform are determined defibrillation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201570356U CN201308717Y (en) | 2008-12-12 | 2008-12-12 | Discharge energy compensation circuit for external defibrillator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201570356U CN201308717Y (en) | 2008-12-12 | 2008-12-12 | Discharge energy compensation circuit for external defibrillator |
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| CN201308717Y true CN201308717Y (en) | 2009-09-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2008201570356U Expired - Fee Related CN201308717Y (en) | 2008-12-12 | 2008-12-12 | Discharge energy compensation circuit for external defibrillator |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102974041A (en) * | 2012-12-20 | 2013-03-20 | 久心医疗科技（苏州）有限公司 | Intelligent defibrillation device with self-adapting capacity |
| CN106110505A (en) * | 2015-05-08 | 2016-11-16 | 三星电子株式会社 | Controller and the patch-type automated external defibrillator of its control defibrillation of use |
| CN108367155A (en) * | 2015-12-17 | 2018-08-03 | 诺华股份有限公司 | Power supply box for electroactive medical device battery management |
| CN113693583A (en) * | 2021-07-29 | 2021-11-26 | 深圳市安保科技有限公司 | Transthoracic impedance measurement circuit and defibrillator |
-
2008
- 2008-12-12 CN CNU2008201570356U patent/CN201308717Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102974041A (en) * | 2012-12-20 | 2013-03-20 | 久心医疗科技（苏州）有限公司 | Intelligent defibrillation device with self-adapting capacity |
| CN106110505A (en) * | 2015-05-08 | 2016-11-16 | 三星电子株式会社 | Controller and the patch-type automated external defibrillator of its control defibrillation of use |
| CN106110505B (en) * | 2015-05-08 | 2022-04-08 | 三星电子株式会社 | Controller and patch type automatic external defibrillator for controlling defibrillation using the same |
| CN108367155A (en) * | 2015-12-17 | 2018-08-03 | 诺华股份有限公司 | Power supply box for electroactive medical device battery management |
| CN113693583A (en) * | 2021-07-29 | 2021-11-26 | 深圳市安保科技有限公司 | Transthoracic impedance measurement circuit and defibrillator |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090916 Termination date: 20131212 |