TWI644698B - Automatic external cardiac shock defibrillator capable of stabilizing output energy and method for stabilizing output energy of automatic external cardiac shock defibrillator - Google Patents

Abstract

The invention provides an automatic external cardiac shock defibrillator capable of stabilizing output energy and a method for stabilizing output energy of an automatic external cardiac shock defibrillator, comprising an impedance detecting unit electrically connected to a second electric shock patch and a discharge The time control unit is configured to detect the body impedance between the two electric shock patches by using the impedance detecting unit, and adjust the discharge time between the two electric shock patches through the discharge time control unit to stabilize the output of the electric shock energy.

Description

Automatic external cardiac shock defibrillator capable of stabilizing output energy and method for stabilizing output energy of automatic external cardiac shock defibrillator

The present invention relates to an automatic external defibrillator, and more particularly to an automatic external cardiac shock defibrillator that can stably output energy and a method for stabilizing the output energy of an automatic external cardiac shock defibrillator.

Press, Automatic Defibrillator (AED) is an emergency medical rescue device with electric shock function. It usually has two electric shock patches that can output energy. The user sticks to the patient and endangers the sudden paralysis of the heart. The patient of life can use the automatic external defibrillator to give a heart electric shock to the patient under simple operation, so that the heart can return to the normal beating frequency, so as to prevent the patient from being able to transport the blood due to the heart. Organ failure or permanent necrosis, especially brain tissue.

The conventional automatic external defibrillator generally comprises a controller and a second electric shock patch, and the controller has an ECG detecting unit built therein, and the user can attach the second electric shock patch to the skin of the patient. Detecting the heart rhythm of the patient and transmitting the physiological signal of the heart rate signal to the controller. When the controller determines that the patient is in a state of arrhythmia, the electric shock energy can be supplied to the patient's chest through the second electric shock patch. The heart can resume normal beat frequency.

Although the automatic external defibrillator currently seen is very convenient to use, it provides the function of emergency ambulance. However, since the skin moisture of each patient is different, the skin impedance is also different, only by measuring the patient's The heart rate signal is the output energy electric shock patient. These electric shock energy values are usually not accurate enough and unstable, so the electric shock effect needs to be improved. However, there is no automatic automatic adjustment of the output stable energy according to the impedance difference of the patient's skin. External defibrillator.

The main object of the present invention is to provide an automatic external cardiac shock defibrillator capable of stabilizing output energy and a method for stabilizing the output energy of an automatic external cardiac shock defibrillator, which can detect a patient's body impedance and adjust the discharge time. In turn, it can output stable and fixed electric shock energy, which is of practical value.

Therefore, in order to achieve the foregoing objective, the present invention provides an automatic external cardiac shock defibrillator capable of stably outputting energy, comprising an electrically connected second electric shock patch and a controller, and the like, the second electric shock patch system Attached to the human body for transmitting signals and releasing appropriate power, the controller is for controlling the release of power and signal transmission of the two electric shock patches; and further comprising an impedance detecting unit electrically connected to the two electric shocks a patch for detecting body impedance between the two electric shock patches and feeding back the controller; a discharge time control unit electrically connecting the two electric shock patches for adjusting the second electric shock patch by the controller The discharge time and the output of stable energy.

Further, the device further includes a surge protection unit electrically connected between the impedance detecting unit and the two electric shock patches.

Further, a first relay is further included between the surge protection unit and the second electric shock patch for adjusting and controlling the operation of the two electric shock patches.

Further, the impedance detecting unit is electrically connected between the surge protection unit and an electrocardiogram detecting unit, and the electrocardiogram detecting unit is electrically connected to the controller.

Further, the impedance detecting unit comprises a Howland current source circuit, a high-pass filter electrically connected to the Howland current source circuit, a waveform generator electrically connected to the high-pass filter, an oscillator, and the electrical connection. a waveform generator, an operational amplifier electrically connected between the Howland current source circuit, the electrocardiogram detecting unit and the surge protection unit, an active rectifier electrically connected to the operational amplifier, a low pass filter, and an electrical connection The active rectifier and controller.

Further, the discharge time control unit comprises a left unit, a right unit, a second relay, a high voltage voltage dividing circuit, a shock voltage monitor and a discharge circuit, wherein the left and right units respectively comprise electricity One of the sexual connection is a rectifier rectifier and an IGBT switch. The second relay is electrically connected between the left and right units and electrically connected to the two electric shock patches for adjusting and controlling the left and right units and the second electric shock. The operation of the patch, the high voltage voltage dividing circuit is electrically connected to the left and right unit of the controlled rectifier, the shock voltage monitor system The high voltage voltage dividing circuit is electrically connected, and the discharging circuit is electrically connected to the right unit.

In addition, the present invention further provides a method for stabilizing the output energy of an automatic external cardiac shock defibrillator, which mainly detects the body impedance between the two electric shock patches of the automatic external cardiac shock defibrillator, and then adjusts the impedance according to the impedance. The discharge time of the two electric shock patches is to maintain the stable output energy of the two electric shock patches.

10‧‧‧Automated external cardiac shock defibrillator

1, 2‧‧‧ electric shock patch

3‧‧‧ Controller

4‧‧‧ECG detection unit

12‧‧‧ Impedance detection unit

14‧‧‧Discharge time control unit

16‧‧‧ Surge protection unit

18‧‧‧First relay

22‧‧‧Howland Current Source Circuit

24‧‧‧High-pass filter

26‧‧‧ Waveform Generator

28‧‧‧Oscillator

30‧‧‧Operational Amplifier

32‧‧‧Active rectifier

34‧‧‧Low-pass filter

36‧‧‧left unit

38‧‧‧right unit

361, 381‧‧ ‧ remotely controlled rectifier

362, 382‧‧‧ IGBT switch

40‧‧‧Second relay

42‧‧‧High voltage divider circuit

44‧‧‧Electric shock voltage monitor

46‧‧‧Discharge circuit

The first figure is a system diagram of a preferred embodiment of the present invention.

The second figure is a diagram showing the relationship between an impedance detecting unit and other components in a preferred embodiment of the present invention.

The third figure is a diagram showing the relationship between the discharge time control unit and other components in a preferred embodiment of the present invention.

The fourth figure is a discharge time diagram of the same energy for a patient of three different impedances in accordance with a preferred embodiment of the present invention.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings as follows:

First, referring to the first to third embodiments, an automatic external cardiac defibrillator 10 capable of stably outputting energy according to a preferred embodiment of the present invention includes an electrically connected second electric shock patch 1, 2 and a controller 3 and other components, the two electric shock patches 1, 2 are attached to the human body (the chest skin is close to the heart) For controlling the transmission of signals and releasing appropriate power, the controller 3 is for controlling the release of power and the transmission of signals of the two electric shock patches 1, 2, including an electrocardiogram detecting unit 4, an analog/digital signal converter, etc. The components of the present invention are the same as those of the conventional automatic external cardiac defibrillator. The detailed structure and operation mode of the components are not described herein. The extracorporeal cardiac shock defibrillator 10 is characterized by further comprising an impedance detecting unit 12 and a discharge time control unit 14.

The impedance detecting unit 12 is connected in series with a surge protection unit 16, and a first relay 18 is electrically connected to the two electric shock patches 12 and 13. The method includes a Howland current source circuit 22, a high-pass filter 24, and a waveform generation. The device 26, an oscillator 28, an operational amplifier 30, an active rectifier 32, and a low pass filter 34 and the like. The high-pass filter 24 is electrically connected to the Howland current source circuit 22, and the waveform generator 26 is electrically connected to the high-pass filter 24, and the oscillator 28 is electrically connected to the waveform generator 26, and the operational amplifier 30 is electrically connected. The active rectifier 32 is electrically connected to the operational amplifier 30, and the low-pass filter 34 is electrically connected to the active rectifier 32 and the controller 3 between the Howland current source circuit 22, the electrocardiogram detecting unit 4 and the surge protection unit 16. . Each of the Howland current source circuit 22, the high pass filter 24, the waveform generator 26, the oscillator 28, the operational amplifier 30, the active rectifier 32 and the low pass filter 34 are conventional electronic components, the principle, function and operation mode thereof. I will not repeat them, but through the Howland current source circuit 22, high-pass filter 24, waveform generator 26, oscillator 28, operational amplifier 30, active rectifier 32 and low-pass filter. The wave device 34 is configured to detect the body impedance between the two electric shock patches 12 and 13, and feedback the impedance value to the controller 14, and the first relay 24 can adjust and control the two electric shock patches 1, 2 Operation.

The discharge time control unit 14 is electrically connected to the two electric shock patches 1 and 2 through the first relay 18, and includes a left unit 36, a right unit 38, a second relay 40, and a high voltage voltage dividing circuit 42. An electric shock voltage monitor 44 and a discharge circuit 46 and the like. The left and right units 36 and 38 respectively include two series-controlled rectifiers 361 and 381 and two IGBT switches 362 and 382 connected in series, and the second relay 40 is electrically connected between the left and right units 36 and 38 and electrically connected. The two electric shock patches 1, 2 are connected to adjust and control the operation of the left and right units 36, 38 and the two electric shock patches 1, 2, and the high voltage voltage dividing circuit 42 is electrically connected to the left and right units 36. The voltage-controlled voltage regulators 44 are electrically connected to the high-voltage voltage dividing circuit 42, and the discharging circuit 46 is electrically connected to the right unit 38. Each of the left and right units 36, 38, the second relay 40, the high voltage voltage dividing circuit 42, the shock voltage monitor 44, and the discharging circuit 46 are conventional electronic components, and the principles and functions of the components are not described herein. And the operation mode, but through the left and right units 36, 38, the second relay 40, the high voltage voltage dividing circuit 42, the shock voltage monitor 44, and the discharging circuit 46, can be controlled by the controller 3 Adjust the discharge time of the two electric shock patches 1 and 2, and output the stable energy.

Thereby, the automatic external cardiac shock defibrillator 10 of the present invention is used in a conventional manner as in the conventional defibrillator: when the patient has discomfort, the operator can The second electric shock patch 1 and 2 are attached to the chest skin of the patient close to the heart, so that the heart rate signal of the patient can be measured through the electrocardiogram detecting unit 4 and the controller 3 can be returned to the controller 3 if the controller 3 judges the disease. When the heart rhythm signal presents arrhythmia ventricular fibrillation, the electric shock energy can be supplied to the patient's chest through the two electric shock patches 1, 2 to achieve the defibrillation effect. The automatic external cardiac shock defibrillator The features and effects of 10 are:

Since the skin moisture of each patient is different, the generated impedance is also different, and the shock energy output from the defibrillator is unstable due to the impedance. The present invention can be used by the impedance detecting unit 12 and the discharge time control unit. The setting of 14 is, when the electrocardiogram detecting unit 4 receives the electrocardiogram, and simultaneously detects the impedance between the two electric shock patches 1 and 2, the controller 3 is returned, converted into a digital signal, and then transmitted through the controller 3 Adjusting the opening or closing of the left and right units 36, 38 of the discharge time control unit 14 according to the magnitude of the impedance (the average of the adults is 75 Ω, ~ 175 Ω) to adjust the discharge time in the positive and negative directions, that is, the discharge time control The unit 14 can shorten the discharge time with low resistance and increase the discharge time with high resistance (small current), thereby ensuring that the energy flowing through the patient during discharge can be maintained at 150 J ± 10% (adult), so that the second electric shock patch 1 2 can output stable and fixed shock energy.

Second, whether the shock energy of the defibrillator is effective for the heart, how to transfer energy (or waveform, that is, the value of voltage over time) is actually more important than the energy value delivered. Since the set peak voltage of the capacitor in the defibrillator is attenuated as the current is delivered to the patient, the positive and negative pulses are changed by The duration of the control can be delivered to the patient.

As shown in the fourth figure a), b), c), the present invention provides a discharge time map (SMART biphasic waveform) of the same energy (150J) for three different impedance (50 Ω, 80 Ω, 125 Ω) patients, It shows how the waveform of the current varies with different patient impedances, and by varying the waveform, provides the highest level of effectiveness for defibrillation of the patient at different impedance values. As can be seen from the fourth figure, the present invention adjusts the tilt (slope) and duration for different patient impedances such that each shock energy is maintained at approximately 150 J, and the phase ratio or waveform is adjusted according to the impedance of the patient in the positive pulse versus the negative pulse. The relative amount of time to ensure that the waveform remains valid for all patients. Since the voltage is exponential with the energy system, adjusting the aforementioned parameters can more accurately control the accuracy of the delivered energy.

The average body impedance of an adult is 75 ohms (typically between 25 ohms and 80 ohms), as the auto-in vitro cardiac shock defibrillator 10 of the present invention measures the body impedance of the patient and adjusts the waveform accordingly, controlling the delivered energy. Therefore, each time the shock button is pressed, it provides the patient with 150 J of energy, the slope and duration of the desired waveform.

As can be seen from the above, the present invention further provides a method for stabilizing the output energy of an automatic external cardiac defibrillator, mainly by detecting the electric shock patch 1 and 2 of the external external cardiac defibrillator 10 through the impedance detecting unit 12. The physical impedance between the electrodes is adjusted by the discharge time control unit 14 according to the impedance level to adjust the discharge time of the two electric shock patches 1, 2 to maintain the stable output energy of the two electric shock patches 1, 2.

In summary, the present invention provides an automatic external cardiac defibrillator capable of stabilizing output energy and a method for stabilizing output energy of an automatic external cardiac shock defibrillator, which can detect a second electric shock patch by using the impedance detecting unit. The patient's body impedance is fed back to the controller, so that the controller adjusts the discharge time of the discharge time control unit according to the magnitude of the impedance, so that the two electric shock patches can output stable and fixed shock energy. It is of practical value; the reason is that the invention does meet the requirements of the invention patent and submits an application according to law.

Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the invention, and it is intended that the invention may be modified and modified without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

Claims (3)

An automatic external cardiac shock defibrillator capable of stabilizing output energy, comprising an electrically connected second electric shock patch and a controller, etc., the two electric shock patches are attached to the human body for transmitting signals and releasing appropriate power The central processing system is configured to control the release of the power of the two electric shock patches and the transmission of the signal; and further comprising: an impedance detecting unit electrically connected to the two electric shock patches for detecting the two electric shocks The body impedance between the patches is fed back to the controller; a discharge time control unit is electrically connected to the two electric shock patches for adjusting the discharge time and the output of the stable energy between the two electric shock patches by the controller; a surge protection unit electrically connected between the impedance detecting unit and the second electric shock patch; and a first relay electrically connected between the surge protection unit and the second electric shock patch for adjusting and controlling The operation of the two electric shock patches. An automatic external cardiac shock defibrillator capable of stabilizing output energy, comprising an electrically connected second electric shock patch and a controller, etc., the two electric shock patches are attached to the human body for transmitting signals and releasing appropriate power The central processing system is configured to control the release of the power of the two electric shock patches and the transmission of the signal; and further comprising: an impedance detecting unit electrically connected to the two electric shock patches for detecting the two electric shocks The body impedance between the patches is fed back to the controller; a discharge time control unit is electrically connected to the two electric shock patches for being controlled by the controller to adjust the discharge time between the two electric shock patches and stabilize the energy And a surge protection unit electrically connected between the impedance detecting unit and the second electric shock patch; wherein the impedance detecting unit is electrically connected to the surge protection unit and an electrocardiogram (ECG) detecting unit The electrocardiogram detecting unit is electrically connected to the controller, and the impedance detecting unit comprises a Howland current source circuit, a high-pass filter (HPF, High-pass filter), electrically connected to the Howland current source circuit, and a waveform. a generator, electrically connected to the high-pass filter, an oscillator (OSC), electrically connected to the waveform generator, an operational amplifier (AMP), electrically connected to the Howland current source circuit, the electrocardiogram detecting unit and the surge Between the protection units, an active rectifier is electrically connected to the operational amplifier, and a low-pass filter (LPF, Low-pass filter) is electrically connected to the active rectifier and the controller. An automatic external cardiac shock defibrillator capable of stabilizing output energy, comprising an electrically connected second electric shock patch and a controller, etc., the two electric shock patches are attached to the human body for transmitting signals and releasing appropriate power The central processing system is configured to control the release of the power of the two electric shock patches and the transmission of the signal; and further comprising: an impedance detecting unit electrically connected to the two electric shock patches for detecting the two electric shocks The body impedance between the patches is fed back to the controller; a discharge time control unit is electrically connected to the two electric shock patches for adjusting the discharge time and the output of the stable energy between the two electric shock patches by the controller; And a first relay electrically connected to the surge protection unit and the second electric shock sticker Between the sheets, the operation of the two electric shock patches is adjusted and controlled; wherein the impedance detecting unit is electrically connected between the surge protection unit and an electrocardiogram detecting unit, and the electrocardiogram detecting unit is electrically connected a controller, the impedance detecting unit includes a Howland current source circuit, a high-pass filter (HPF, High-pass filter), electrically connected to the Howland current source circuit, a waveform generator, and the high-pass filter is electrically connected. An oscillator (OSC) electrically connected to the waveform generator, an operational amplifier (AMP), electrically connected between the Howland current source circuit, the electrocardiogram detecting unit and the surge protection unit, an active rectifier, and an electrical The operational amplifier is connected, and a low-pass filter (LPF, Low-pass filter) is electrically connected to the active rectifier and the controller.