CN219847851U - Automatic external defibrillator with pacing function - Google Patents
Automatic external defibrillator with pacing function Download PDFInfo
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- CN219847851U CN219847851U CN202321102205.1U CN202321102205U CN219847851U CN 219847851 U CN219847851 U CN 219847851U CN 202321102205 U CN202321102205 U CN 202321102205U CN 219847851 U CN219847851 U CN 219847851U
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- 239000003990 capacitor Substances 0.000 claims abstract description 25
- 238000010586 diagram Methods 0.000 description 8
- 230000033764 rhythmic process Effects 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 5
- 230000035939 shock Effects 0.000 description 4
- 208000003663 ventricular fibrillation Diseases 0.000 description 4
- 206010047302 ventricular tachycardia Diseases 0.000 description 3
- 206010003119 arrhythmia Diseases 0.000 description 2
- 238000010009 beating Methods 0.000 description 2
- 206010049418 Sudden Cardiac Death Diseases 0.000 description 1
- 206010044565 Tremor Diseases 0.000 description 1
- 230000006793 arrhythmia Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 210000001013 sinoatrial node Anatomy 0.000 description 1
- 208000014221 sudden cardiac arrest Diseases 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Abstract
The utility model discloses an automatic external defibrillator with a pacing function, which comprises a control unit and a DC-DC converter, wherein the output end of the DC-DC converter is connected with a capacitor in parallel through a first switch, the capacitor is connected with a first electrode patch in series through a second switch, the capacitor is connected with a second electrode patch in series through a third switch, the control unit controls the first to third switches, when the first switch is turned on, the second switch is turned off and the third switch is turned off, the DC-DC converter charges the capacitor, and when the first switch is turned off, the second switch and the third switch are turned on, the automatic external defibrillator sends a pacing pulse. The first and second switches of the present utility model are designed to precisely control the width of the pacing pulse.
Description
Technical Field
The utility model belongs to the field of emergency devices, and particularly relates to an automatic external defibrillator with a pacing function.
Background
An automatic external defibrillator is an emergency rescue device used to address sudden cardiac arrest conditions. It restores the normal heart rhythm by applying an electric shock to the patient's chest, thereby restoring the effective contractions of the heart. The main purpose of automatic external defibrillators is to eliminate serious cardiac arrhythmias such as ventricular fibrillation (ventricular fibrillation) or ventricular tachycardia (ventricular tachycardia).
When the heart is normal, the heart beats according to a certain rhythm, the heart is inconsistent in each part of the heart in ventricular fibrillation, the ejection function cannot be well exerted, the defibrillator supplies current to the heart, so that each part of the heart is subjected to the pole removal and synchronous beating, and then the autonomous electrocardio activity and the autonomous circulation are recovered by means of the sinus node of the heart.
The defibrillation treatment of the automatic external defibrillator is to shock the heart to make the disordered rhythm return to normal, that is, to eliminate the 'tremor' of the heart and restore the normal pumping function. While automatic external defibrillators can be used to eliminate severe arrhythmias, such as ventricular fibrillation or ventricular tachycardia, in some cases the patient's heart may still develop a slower or irregular rhythm or stop beating altogether. It is therefore necessary to act as a temporary means of restoring the autonomous rhythm of the heart by external pacing. At present, emergency rescue equipment such as an automatic external defibrillator and the like mostly have no external pacing function.
Disclosure of Invention
The utility model aims to provide an automatic external defibrillator with a pacing function.
In order to achieve the above purpose, the technical scheme of the utility model is as follows:
the automatic external defibrillator with the pacing function comprises a control unit and a DC-DC converter, wherein the output end of the DC-DC converter is connected with a capacitor in parallel through a first switch, the capacitor is connected with a first electrode patch in series through a second switch, the capacitor is connected with a second electrode patch in series through a third switch, the control unit controls the first switch, the second switch and the third switch, when the first switch is turned on, the second switch is turned off, and when the third switch is turned off, the DC-DC converter charges the capacitor, and when the first switch is turned off, the second switch and the third switch are turned on, the automatic external defibrillator sends pacing pulses.
In a preferred embodiment of the present utility model, the first switch includes a first switch tube, a second switch tube, a third switch tube, a fourth switch tube and a fifth switch tube, where the fifth switch tube and the third switch tube are connected in parallel with the first end of the DC-DC converter and the second end of the capacitor, the fourth switch tube is connected in series between the gate and the ground of the third switch tube, the second switch tube is connected in series between the gate and the first end of the third switch tube, and the first switch tube is connected in series between the gate and the ground of the second switch tube.
In a preferred embodiment of the present utility model, the fifth switching tube is an N-type switching tube; the third switching tube is a P-type switching tube, and the fourth switching tube is an N-type switching tube; the second switching tube is a P-type switching tube; the first switching tube is an N-type switching tube.
In a preferred embodiment of the present utility model, the second switch includes a sixth switch tube, a seventh switch tube, an eighth switch tube and a ninth switch tube, wherein the seventh switch tube is connected in series between a second end and a third end, the third end is connected with the first electrode sheet, the sixth switch tube is connected in series between a gate and a ground of the seventh switch tube, the eighth switch tube is connected in series between a gate and a first end of the seventh switch tube, and the ninth switch tube is connected in series between a gate and a ground of the eighth switch tube.
In a preferred embodiment of the present utility model, the seventh switching tube is an N-type switching tube; the sixth switching tube is an N-type switching tube; the eighth switching tube is a P-type switching tube; the ninth switching tube is an N-type switching tube.
In a preferred embodiment of the present utility model, the automatic external defibrillator with pacing function further includes a resistor, and the capacitor is connected in parallel with the resistor.
In a preferred embodiment of the present utility model, the automatic external defibrillator with pacing function further includes an inductor, and the inductor is connected in series with the first electrode pad.
According to the technical scheme, the function of the pacemaker is realized by using 2 electrode patches of the automatic external defibrillator, the automatic pacing of the external pacemaker is realized according to the judgment of an electrocardiogram, and the pacing frequency, the pacing pulse width and the automatic regulation of the pacing amplitude of the external pacemaker are realized according to the transthoracic impedance of the electrode. And realizing a pacing pulse generating circuit with ultra-low power consumption and finely adjustable pacing pulse parameters according to the related information.
In order to make the above features and advantages of the utility model more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 shows an example of an automatic external defibrillator according to the present utility model in use.
Fig. 2 is a control function block diagram of the automatic external defibrillator of the present utility model.
Fig. 3 is a power functional block diagram of an automatic external defibrillator of the present utility model.
Fig. 4 is a circuit diagram of an embodiment of the switch K1 in fig. 3.
Fig. 5 is a circuit diagram of an embodiment of the switch K2 in fig. 3.
In the drawings, like reference numerals refer to like elements.
Detailed Description
In order to make the purpose and technical solutions of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. It will be apparent that the described embodiments are some, but not all, embodiments of the utility model. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present utility model fall within the protection scope of the present utility model.
An example of the use of the automated external defibrillator of the present utility model is shown in fig. 1, where the automated external defibrillator examines the heart rhythm and delivers an electrical shock to restore the heart to normal rhythm. The automated external defibrillator 1 has written instructions and gives a voice instruction to the operator. The operator 2 will place the electrode patches on the chest 31 of the patient 3, with the electrode patches P1 and P2 being electrically conductive to the chest. As shown in fig. 2, which is a functional block diagram of the automatic external defibrillator 1 according to the present utility model, the control unit of the automatic external defibrillator 1 according to the present utility model senses the electrocardiograph of the human body through the electrocardiogram sensing module U11, and the impedance sensing module U12 senses the contact resistance between the discharge electrode and the human body, and performs pacing or defibrillation through the comprehensive operation of the control unit U1. Further, electrode patches P1 and P2 are connected via wires to circuitry within the automatic external defibrillator 1 configured to apply a defibrillation shock or a pacing shock.
Referring to fig. 3 again, fig. 3 is a block diagram of the above circuit, where the circuit U2 includes a DC-DC converter, an input end of the DC-DC converter U2 is connected with a battery or other DC power source, an output end of the DC-DC converter U2 is connected in parallel with a capacitor C through a switch K1, the capacitor C is connected in series with an electrode patch P1 through the switch K2, the electrode patch P1 is connected in series with an inductor L, and a resistor R is connected in parallel with the capacitor C. The capacitor C is connected in series with the electrode patch P2 through a switch K3.
After the DC-DC converter U2 converts direct current into high-voltage direct current, the high-voltage energy storage capacitor C is charged, and when the energy of the capacitor C reaches a preset value, the switch K1 is turned off, and the charging is completed. The equivalent circuit between the capacitor C and the human body is an RLC series resonance circuit. The switch K1 is conducted, and the automatic external defibrillator defibrillates or paces the current released by the human body through the electrode patches P1 and P2. The inductance L and the capacitance C and the contact impedance of the human body are in series resonance, and the values of the inductance L and the capacitance C can be designed to control the discharge time to be between 4 and 10 ms. The resistor R can perform internal discharge without defibrillation or pacing operation after the charging is completed, the impedance of the resistor R1 is far greater than that of the resistor R2, and the RLC series resonant circuit is not affected by the resistor R1 when the patient is subjected to defibrillation discharge. The proper choice of L, C values can control the discharge time to within 4 to 10 milliseconds.
Fig. 4 shows a circuit diagram of a switch K1, which includes a switch tube S1, a switch tube S2, a switch tube S3, a switch tube S4 and a switch tube S5, wherein the switch tube S5 and the switch tube S3 are connected in parallel, and any one of them is conducted to enable the end A1 to be communicated with the end A2. The switching tube S5 is an N-type switching tube, and the gate of the switching tube S is turned on when the gate is in a high level and turned off when the gate is in a low level; the switching tube S3 is a P-type switching tube, and the gate is turned on when the level is low and turned off when the level is high. The switching tube S4 is connected in series between the gate electrode and the ground end of the switching tube S3, the switching tube S4 is an N-type switching tube, and the gate electrode is turned on when in high level and turned off when in low level; the switching tube S2 is connected in series between the gate electrode and the end A1 of the switching tube S3, the switching tube S2 is a P-type switching tube, and the gate electrode is turned on when in a low level and turned off when in a high level; the switching tube S1 is connected in series between the gate electrode and the ground end of the switching tube S2, the switching tube S1 is an N-type switching tube, and the gate electrode is turned on when in high level and turned off when in low level.
The control signals SW1 and SW2 are control signals sent by the control unit U1, the control signal SW1 is in a low level, when the control signal SW2 is in a high level, the switching tube S4 and the switching tube S5 are conducted, the gate electrode of the switching tube S3 is connected with the ground terminal after the switching tube S4 is conducted, the switching tube S3 is conducted, at the moment, the switching tubes S1 and S2 are turned off, and the switch K1 is turned on; when the control signal SW1 is at a high level and the control signal SW2 is at a low level, the switching tube S4 and the switching tube S5 are turned off, the switching tube S1 is turned on, the switching tube S2 is turned on, the gate electrode of the switching tube S3 is connected to the terminal A1, the terminal A1 is at a high level at the output end of the DC-DC converter U2, the switching tube S3 is turned off, and the switch K1 is turned off.
As shown in fig. 5, a circuit diagram of a switch K2 includes a switching tube S7, a switching tube S6, a switching tube S8, and a switching tube S9, where the switching tube S7 is connected in series between a terminal A2 and a terminal A3, is an N-type switching tube, and has a gate that is turned on when it is at a high level and turned off when it is at a low level; the switching tube S6 is connected in series between the gate electrode and the ground end of the switching tube S7, the switching tube S6 is an N-type switching tube, and the gate electrode is turned on when in high level and turned off when in low level; the switching tube S8 is connected in series between the gate electrode and the end A1 of the switching tube S7, the switching tube S8 is a P-type switching tube, and the gate electrode is turned on when in a low level and turned off when in a high level; the switching tube S9 is connected in series between the gate electrode and the ground end of the switching tube S8, the switching tube S9 is an N-type switching tube, and the gate electrode is turned on when in high level and turned off when in low level.
The control signals SW3 and SW4 are control signals sent by the control unit U1, the control signal SW3 is low level, when the control signal SW4 is high level, the switch tube S6 is turned off, the switch tube S9 is turned on, the switch tube S8 is turned on, the gate electrode of the switch tube S7 is connected with the end A1, the switch end S7 is turned on, and the switch K2 is turned on; when the control signal SW3 is at a high level and the control signal SW4 is at a low level, the switching tube S6 is turned on, the gate electrode of the switching tube S7 is connected to the ground, the switching tube S7 is turned off, the switching tube S9 is turned off, and the switching tube K2 is turned off.
The automatic external defibrillator 1 delivers a pacing pulse in the following working process, the control unit U1 turns on the switch K1 (i.e. the transmission control signal SW1 is low, SW2 is high), the switch K2 turns off (i.e. the transmission control signal SW3 is high, SW4 is low), the switch K3 turns off, the DC-DC converter U2 starts to charge the capacitor C, and detects the output voltage of the DC-DC converter U2, when the output voltage of the DC-DC converter U2 reaches the first set value, the capacitor C is indicated to reach the preset value, the switch K2 is turned off, and when the output voltage of the DC-DC converter U2 reaches the second set value, the DC-DC converter U2 is turned off.
The control unit U1 delivers a pacing pulse, and turns off the switch K1 (i.e., the transmission control signal SW1 is at a high level, SW2 is at a low level), turns on the switch K2 (i.e., the transmission control signal SW3 is at a low level, SW4 is at a high level), and delivers a pacing pulse. When the preset pulse width is reached, the switch K2 is turned off (i.e., the transmission control signal SW3 is at a high level and SW4 is at a low level).
The automatic external defibrillator 1 judges whether pacing is needed before defibrillation, and sends pacing pulses through the switches K1 and K2, the circuit structure is simple, and the pacing pulse amplitude and the pulse width can be finely adjusted within a very wide range (0.1-8V, 0.1-2 ms). The average current of the whole circuit is smaller than 4uA (pacing frequency 60ppm, pacing pulse amplitude 2.5V, pulse width 0.4ms and load 500 ohms) under the condition of ultra-low power consumption and 3V power supply voltage.
Although the present utility model has been described with reference to the above embodiments, it should be understood that the utility model is not limited thereto, but rather is capable of modification and variation without departing from the spirit and scope of the present utility model.
Claims (7)
1. The automatic external defibrillator with the pacing function is characterized by comprising a control unit and a DC-DC converter, wherein the output end of the DC-DC converter is connected with a capacitor in parallel through a first switch, the capacitor is connected with a first electrode patch in series through a second switch, the capacitor is connected with a second electrode patch in series through a third switch, the control unit controls the first switch, the second switch and the third switch, and when the first switch is turned on, the second switch is turned off and the third switch is turned off, the DC-DC converter charges the capacitor, and when the first switch is turned off, the second switch and the third switch are turned on, the automatic external defibrillator sends pacing pulses.
2. The automated external defibrillator with pacing function of claim 1 wherein the first switch comprises a first switch tube, a second switch tube, a third switch tube, a fourth switch tube and a fifth switch tube, wherein the fifth switch tube and the third switch tube are connected in parallel to the first end of the DC-DC converter and the second end of the capacitor, the fourth switch tube is connected in series between the gate and the ground of the third switch tube, the second switch tube is connected in series between the gate and the first end of the third switch tube, and the first switch tube is connected in series between the gate and the ground of the second switch tube.
3. The automated external defibrillator with pacing function of claim 2 wherein the fifth switching tube is an N-type switching tube; the third switching tube is a P-type switching tube; the fourth switching tube is an N-type switching tube; the second switching tube is a P-type switching tube; the first switching tube is an N-type switching tube.
4. The automated external defibrillator with pacing function of claim 2 wherein the second switch comprises a sixth switch tube, a seventh switch tube, an eighth switch tube and a ninth switch tube, the seventh switch tube being connected in series between a second end and a third end, the third end being connected with the first electrode patch, the sixth switch tube being connected in series between a gate and a ground of the seventh switch tube, the eighth switch tube being connected in series between a gate and a first end of the seventh switch tube, the ninth switch tube being connected in series between a gate and a ground of the eighth switch tube.
5. The automated external defibrillator with pacing function of claim 4 wherein the seventh switching tube is an N-type switching tube; the sixth switching tube is an N-type switching tube; the eighth switching tube is a P-type switching tube; the ninth switching tube is an N-type switching tube.
6. The automated external defibrillator with pacing function of claim 1, wherein,
the capacitor is connected with the resistor in parallel.
7. The automated external defibrillator with pacing function of claim 6, wherein,
the device also comprises an inductor, wherein the inductor is connected with the first electrode patch in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321102205.1U CN219847851U (en) | 2023-05-09 | 2023-05-09 | Automatic external defibrillator with pacing function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321102205.1U CN219847851U (en) | 2023-05-09 | 2023-05-09 | Automatic external defibrillator with pacing function |
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| Publication Number | Publication Date |
|---|---|
| CN219847851U true CN219847851U (en) | 2023-10-20 |
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| CN202321102205.1U Active CN219847851U (en) | 2023-05-09 | 2023-05-09 | Automatic external defibrillator with pacing function |
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| CN (1) | CN219847851U (en) |
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2023
- 2023-05-09 CN CN202321102205.1U patent/CN219847851U/en active Active
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