Defibrillator self-checking circuit and defibrillator

Abstract

The utility model provides a defibrillator self-checking circuit and defibrillator wherein the defibrillator self-checking circuit comprises: a master control circuit, an energy storage capacitor, a switch control circuit, a test load and an impedance detection circuit, the switch control circuit comprises an H-bridge circuit, a first relay and a second relay, the switch control circuit is electrically connected with the master control circuit, the energy storage capacitor, the test load, the impedance detection circuit and an external defibrillation electrode. According to the utility model, the main control circuit controls the H-bridge circuit, the first relay and the second relay in the switch control circuit to enter corresponding operation states, so that the internal test load is connected to the defibrillation loop; the carrier signal output by the impedance detection circuit flows through the test load and the external defibrillation electrode to perform impedance self-inspection of the defibrillation loop, so that when the defibrillation electrode is used for self-inspection, the internal resistor can be used as the test load, the self-inspection program is effectively simplified, the self-inspection efficiency is improved, and the self-inspection cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a defibrillator self-checking circuit and a defibrillator. Background Art

[0002] Generally, a defibrillator provides two types of defibrillation electrodes: electrode plates and electrode patches. When performing self-checking of the instrument, it is also necessary to perform self-checking on the electrode plates and electrode patches respectively. The defibrillation electrode plate cable and the defibrillation electrode patch cable can be connected through the cable interface of the defibrillator. When performing self-checking of the electrode plate, connect the electrode plate cable to the cable interface of the defibrillator, and at the same time place the electrode plate handle in the electrode plate slot. A high-power load resistor needs to be pre-installed in the electrode plate slot, and the defibrillation function self-checking is completed through this load resistor. When performing self-checking of the electrode patch, connect the electrode patch cable to the cable interface of the defibrillator, and at the same time, a high-power resistor needs to be manually replaced on the electrode patch cable as a test load during the test for defibrillation function detection. Since a test load needs to be manually connected during the self-checking process of the defibrillation electrode, the self-checking program is relatively complex, and the test load needs to be a high-power load, resulting in a relatively high cost. Therefore, it is necessary to improve the self-checking scheme of the defibrillator. Summary of the Utility Model

[0003] The utility model provides a defibrillator self-checking circuit and a defibrillator, aiming to solve the problems that the detection program of the self-checking scheme in the related art is relatively complex and the self-checking cost is relatively high.

[0004] To solve the above technical problems, a first aspect of the utility model provides a defibrillator self-checking circuit, including: a main control circuit, an energy storage capacitor, a switch control circuit, a test load, and an impedance detection circuit. The switch control circuit includes an H-bridge circuit, a first relay, and a second relay. The impedance detection circuit is electrically connected to the main control circuit and the first end of the first relay respectively. The second relay is electrically connected to the test load, the second end of the first relay, and the main control circuit respectively. The first end of the first relay is also used to be electrically connected to an external defibrillation electrode. The third end of the first relay is electrically connected to the main control circuit. The H-bridge circuit is electrically connected to the energy storage capacitor, the main control circuit, and the common connection end of the first relay and the second relay respectively.

[0005] Further, the H-bridge circuit includes a first switching device, a second switching device, a third switching device, and a fourth switching device. One ends of the first switching device and the second switching device are both electrically connected to one end of the energy storage capacitor. The other end of the first switching device is electrically connected to one end of the third switching device. The other end of the second switching device is electrically connected to one end of the fourth switching device. The other ends of the third switching device, the fourth switching device, and the energy storage capacitor are all grounded. The other ends of the first switching device and the second switching device are both electrically connected to the common connection end of the first relay and the second relay.

[0006] Further, it further includes a first driving circuit, a second driving circuit, a third driving circuit, a fourth driving circuit, a fifth driving circuit, and a sixth driving circuit. One ends of the first driving circuit, the second driving circuit, the third driving circuit, and the fourth driving circuit are respectively electrically connected to the corresponding switching devices in the H-bridge circuit. The other ends of the first driving circuit, the second driving circuit, the third driving circuit, and the fourth driving circuit are all electrically connected to the main control circuit. One end of the fifth driving circuit is electrically connected to the first relay. One end of the sixth driving circuit is electrically connected to the second relay. The other ends of the fifth driving circuit and the sixth driving circuit are all electrically connected to the main control circuit.

[0007] Further, it further includes a detection resistor. One end of the detection resistor is respectively electrically connected to the other end of the third switching device, the other end of the fourth switching device, and the main control circuit. The other end of the detection resistor is grounded.

[0008] Further, the first end and the second end of the second relay are respectively electrically connected to both ends of the test load. The third end and the fourth end of the second relay are respectively electrically connected to the first end and the second end of the first relay. The third end and the fourth end of the first relay are both used for electrically connecting to the defibrillation electrode. The fourth ends of the first relay and the second relay are respectively electrically connected to the fifth driving circuit and the sixth driving circuit.

[0009] Further, it further includes a voltage sampling circuit. The voltage sampling circuit is respectively electrically connected to the energy storage capacitor and the main control circuit.

[0010] Further, the voltage sampling circuit includes a first resistor and a second resistor. The first resistor is respectively electrically connected to the energy storage capacitor and one end of the second resistor. The other end of the second resistor is grounded. The common connection end of the first resistor and the second resistor is electrically connected to the main control circuit.

[0011] Further, it further includes a voltage sampling circuit, and the voltage sampling circuit is electrically connected to the energy storage capacitor and the main control circuit respectively.

[0012] Further, it further includes a charging circuit, and the charging circuit is electrically connected to the energy storage capacitor and the main control circuit respectively.

[0013] Further, it further includes a diode. The positive electrode of the diode is electrically connected to the charging circuit, and the negative electrode of the diode is electrically connected to the energy storage capacitor.

[0014] In the second aspect of the present invention, a defibrillator is provided, which includes the defibrillator self-checking circuit as described in the first aspect of the present invention.

[0015] As can be seen from the above description, the present invention controls the H-bridge circuit, the first relay, and the second relay in the switch control circuit through the main control circuit to enter the corresponding operating states, so that the carrier signal output by the impedance detection circuit flows through the test load and the external defibrillation electrode to perform the impedance self-check of the defibrillation circuit. Thus, when the defibrillator uses the defibrillation electrode for self-check, the internal resistance can be used as the test load, and there is no need to connect an additional high-power load to the defibrillation electrode, thereby simplifying the self-check procedure, improving the self-check efficiency, and reducing the self-check cost at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of a defibrillator self-checking circuit according to an embodiment of the present invention;

[0017] Figure 2 is a circuit schematic diagram of the first defibrillator self-checking circuit according to an embodiment of the present invention;

[0018] Figure 3 is a circuit schematic diagram of the second defibrillator self-checking circuit according to an embodiment of the present invention;

[0019] Figure 4 is a circuit schematic diagram of the third defibrillator self-checking circuit according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0021] In the related art, due to the problems that the detection program of the self-checking scheme is relatively complex and the self-checking cost is relatively high, for this reason, the embodiment of the present utility model provides a defibrillator self-checking circuit.

[0022] As Figure 1 shown in the structural schematic diagram of a defibrillator self-checking circuit provided by the embodiment of the present utility model, the defibrillator self-checking circuit includes: a main control circuit 100, an energy storage capacitor 200, a switch control circuit 300, a test load 400 and an impedance detection circuit 500. The switch control circuit 300 includes an H-bridge circuit 310, a first relay 320 and a second relay 330. The impedance detection circuit 500 is electrically connected to the main control circuit 100 and the first end of the first relay 320 respectively. The second relay 330 is electrically connected to the test load 400, the second end of the first relay 320 and the main control circuit 100 respectively. The first end of the first relay 320 is also used to be electrically connected to an external defibrillation electrode 600. The third end of the first relay 320 is electrically connected to the main control circuit 100. The H-bridge circuit 310 is electrically connected to the energy storage capacitor 200, the main control circuit 100, and the common connection end of the first relay 320 and the second relay 330 respectively.

[0023] Specifically, in this embodiment, the main control circuit 100 controls the H-bridge circuit 310, the first relay 320 and the second relay 330 of the switch control circuit 300 to enter corresponding operating states, so that the detection signal output by the impedance detection circuit 500 flows through the test load 400 and the external defibrillation electrode 600 to perform impedance self-checking of the defibrillation circuit. Thus, through the implementation of the self-checking circuit in this embodiment, when the defibrillator performs impedance self-checking using the defibrillation electrode 600, the internal resistance can be used as the test load, and there is no need to connect an additional high-power load to the defibrillation electrode 600, thereby being able to simplify the self-checking program, improve the self-checking efficiency, and reduce the self-checking cost at the same time.

[0024] As Figure 2 shown in the circuit schematic diagram of the first defibrillator self-checking circuit provided by this embodiment, please refer to Figure 2 , the H-bridge circuit 310 includes a first switching device SW1, a second switching device SW2, a third switching device SW3 and a fourth switching device SW4. One ends of the first switching device SW1 and the second switching device SW2 are both electrically connected to one end of the energy storage capacitor 200 (i.e., C1). The other end of the first switching device SW1 is electrically connected to one end of the third switching device SW3. The other end of the second switching device SW2 is electrically connected to one end of the fourth switching device SW4. The other ends of the third switching device SW3, the fourth switching device SW4 and the energy storage capacitor C1 are all grounded. The other ends of the first switching device SW1 and the second switching device SW2 are both electrically connected to the common connection end of the first relay 320 (i.e., SW5) and the second relay 330 (i.e., SW6).

[0025] Specifically, in this embodiment, the main control circuit 100 can control the four switching devices in the H-bridge circuit 310 to enter the on or off state, control the opening or closing of two relays, so as to connect to the defibrillation electrode 600 through different paths to perform discharge self-check and impedance self-check for different paths; for example, by controlling the second relay SW6 connected to the test load 400 (i.e., R1) to turn on, the test load is connected to the detection circuit, and impedance self-check can be performed without connecting an additional high-power test load at the defibrillation electrode.

[0026] Such as Figure 3 shown is the circuit schematic diagram of the second defibrillator self-check circuit provided in this embodiment. Please refer to Figure 3 , the defibrillator self-check circuit further includes a first drive circuit (i.e., drive 1), a second drive circuit (i.e., drive 2), a third drive circuit (i.e., drive 3), a fourth drive circuit (i.e., drive 4), a fifth drive circuit (i.e., drive 5) and a sixth drive circuit (i.e., drive 6); one ends of the first drive circuit, the second drive circuit, the third drive circuit and the fourth drive circuit are respectively electrically connected to the corresponding switching devices in the H-bridge circuit 310, and the other ends of the first drive circuit, the second drive circuit, the third drive circuit and the fourth drive circuit are all electrically connected to the main control circuit 100. One end of the fifth drive circuit is electrically connected to the first relay SW5, and one end of the sixth drive circuit is electrically connected to the second relay SW6. The other ends of the fifth drive circuit and the sixth drive circuit are both electrically connected to the main control circuit 100 (i.e., MCU).

[0027] Specifically, the first end and the second end of the second relay SW6 are respectively electrically connected to both ends of the test load R1. The third end and the fourth end of the second relay SW6 are respectively electrically connected to the first end and the second end of the first relay SW5. The third end and the fourth end of the first relay SW5 are both used for electrically connecting to the defibrillation electrode 600. The fourth ends of the first relay SW5 and the second relay SW6 are respectively electrically connected to the fifth drive circuit and the sixth drive circuit. Among them, the first drive circuit and the second drive circuit can be isolation drive circuits.

[0028] In this embodiment, the main control circuit MCU can control the driving circuit to output a driving signal to control the switching device and the relay to enter the corresponding operating state. For example, when performing impedance self-check of the defibrillator, the fifth driving circuit and the sixth driving circuit are controlled to output an enabling signal and transmit it to the first relay SW5 and the second relay SW6, so as to control the first relay SW5 and the second relay SW6 to enter the working state. Then, a carrier signal with a specific frequency is output through the impedance detection circuit. The carrier signal returns to the impedance detection circuit 500 after flowing through the test load R1 via the second relay SW6 and the first relay SW5. Since the waveform amplitude of the carrier signal changes after passing through the test load R1, the change in the waveform amplitude of the carrier signal returning to the impedance detection circuit is detected, and the resistance value of the test load R1 is calculated based on the change in the waveform amplitude. Then, the calculated resistance value is compared with the preset resistance value. If the difference between the two is small, it is determined that the impedance detection passes. It should be noted that in the related art, when using an additional high-power load for self-check, it is necessary to calculate the resistance value of the external high-power load through the change in the waveform amplitude of the carrier signal to determine the detection result, which requires adding an additional detection program and has low efficiency.

[0029] Further, please refer to Figure 3 , the defibrillator self-check circuit further includes a detection resistor Rs. One end of the detection resistor Rs is electrically connected to the other ends of the third switching device SW3, the fourth switching device SW4, and the main control circuit 100 respectively, and the other end of the detection resistor Rs is grounded.

[0030] Still further, please refer to Figure 3 , the defibrillator self-check circuit further includes a voltage sampling circuit, and the voltage sampling circuit is electrically connected to the energy storage capacitor C1 and the main control circuit MCU respectively.

[0031] Specifically, the voltage sampling circuit includes a first resistor R2 and a second resistor R3. One end of the first resistor R2 is electrically connected to the energy storage capacitor C1 and one end of the second resistor R3 respectively. The other end of the second resistor R3 is grounded, and the common connection end of the first resistor R2 and the second resistor R3 is electrically connected to the main control circuit MCU.

[0032] In this embodiment, when the defibrillator performs a discharge self-check, by controlling the fifth drive circuit and the sixth drive circuit to output an enabling signal, the first relay SW5 and the second relay SW6 enter the working state. The defibrillation electrode is connected through the first relay SW5. Specifically, the interface terminal can be connected to the cable interface, and then connected to the defibrillation electrode through the cable. The test load is connected through the second relay SW6, and the first drive circuit and the fourth drive circuit are controlled to output an enabling signal, so that the first switching device SW1 and the fourth switching device SW4 enter the working state. At this time, the energy in the energy storage capacitor C1 will flow through the first switching device SW1, the test load R1, the fourth switching device SW4 and the detection resistor Rs for phase I discharge. After the phase I discharge is completed, the first drive circuit and the fourth drive circuit are controlled to output a disabling signal, so that the first switching device SW1 and the fourth switching device SW4 enter the cut-off state, and at the same time, the second drive circuit and the third drive circuit are controlled to output an enabling signal, so that the second switching device SW2 and the third switching device SW3 enter the working state. At this time, the remaining energy in the energy storage capacitor C1 will pass through the second switching device C2, the test load R1, the third switching device SW3 and the detection resistor Rs for phase II discharge. After the phase II discharge is completed, the second switching device SW2 and the third switching device SW3 are controlled to disconnect; during the phase I and phase II discharges, the MCU will continuously detect the voltage of the energy storage capacitor C1 through the voltage sampling circuit and detect the current during the discharge through the detection resistor Rs. If the detected capacitor voltage and discharge current are both within the set range, it is determined that the discharge self-check is passed. It should be noted that the above-mentioned phase I and phase II discharge sequences can be swapped, that is, first control SW2 and SW3 to close for phase II discharge, and then control SW1 and SW4 to close for phase I discharge.

[0033] In addition, after the discharge self-check is performed, there is still a certain amount of energy remaining in the energy storage capacitor C1, which needs to be discharged completely. At this time, the self-discharge self-check can be performed. By controlling the sixth drive circuit to output an enabling signal, the second relay SW6 enters the working state, and SW1 and SW4 are controlled to close or SW2 and SW3 are controlled to close, so that the energy in the energy storage capacitor C1 is self-discharged through the test load R1 and the detection resistor Rs. Among them, the voltage sampling circuit can be used to detect the voltage of the energy storage capacitor C1 to determine whether the energy of the energy storage capacitor C1 has been discharged completely, so as to determine whether the self-discharge detection is passed.

[0034] As Figure 4 shown is the circuit schematic diagram of the third defibrillator self-check circuit provided in this embodiment. Please refer to Figure 4 , the defibrillator self-check circuit further includes a charging circuit, and the charging circuit is electrically connected to the energy storage capacitor C1 and the main control circuit MCU respectively. In addition, the defibrillator self-check circuit further includes a diode D1. The positive electrode of the diode D1 is electrically connected to the charging circuit, and the negative electrode of the diode D1 is electrically connected to the energy storage capacitor C1.

[0035] Specifically, in this embodiment, the main control circuit, i.e., the MCU, can control the charging circuit to charge the energy storage capacitor C1. The charging circuit can be composed of components such as a power supply or a battery, a power management chip, etc. In addition, a high-voltage freewheeling diode D1 can be added between the charging circuit and the energy storage capacitor C1. Charging the energy storage capacitor C1 through this diode D1 can prevent voltage backflow, reduce noise and interference, and ensure the stability of the charging circuit. The main control circuit MCU can also detect the voltage of the energy storage capacitor C1 through a voltage sampling circuit. When it detects that the capacitor voltage reaches the set value, the MCU controls the charging circuit to stop charging and determines that the charging function self-test of the defibrillator passes.

[0036] The defibrillator self-test circuit provided by the embodiment of the present utility model controls the H-bridge circuit, the first relay, and the second relay in the switch control circuit to enter the corresponding operating states through the main control circuit, so that the electric energy of the energy storage capacitor flows through the test load and the external defibrillation electrode to perform the discharge self-test of the defibrillator, and the detection signal output by the impedance detection circuit flows through the test load and the external defibrillation electrode to perform the impedance self-test of the defibrillation circuit. Thus, through the implementation of the self-test circuit in this embodiment, when the defibrillator performs impedance self-test and discharge self-test using the defibrillation electrode, the internal resistance can be used as the test load, and there is no need to connect an additional high-power load to the defibrillation electrode, thereby simplifying the self-test procedure, improving the self-test efficiency, and reducing the self-test cost at the same time.

[0037] The embodiment of the present utility model also provides a defibrillator, and this defibrillator includes the above-mentioned defibrillator self-test circuit.

[0038] It should be noted that the various embodiments in the content of the present utility model are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0039] It should also be noted that in the content of the present utility model, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of another identical element in the process, method, article or device including the said element.

[0040] The above description of the disclosed embodiments enables those skilled in the art to implement or use the content of the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined in the content of the present utility model can be implemented in other embodiments without departing from the spirit or scope of the content of the present utility model. Therefore, the content of the present utility model will not be limited to these embodiments shown in the content of the present utility model, but rather to the broadest scope consistent with the principles and novel features disclosed in the content of the present utility model.

Claims

1. A defibrillator self-checking circuit, characterized in that, Comprising: A main control circuit, an energy storage capacitor, a switch control circuit, a test load, and an impedance detection circuit. The switch control circuit includes an H-bridge circuit, a first relay, and a second relay. The impedance detection circuit is electrically connected to the main control circuit and the first end of the first relay respectively. The second relay is electrically connected to the test load, the second end of the first relay, and the main control circuit respectively. The first end of the first relay is also used to be electrically connected to an external defibrillation electrode. The third end of the first relay is electrically connected to the main control circuit. The H-bridge circuit is electrically connected to the energy storage capacitor, the main control circuit, and the common connection end of the first relay and the second relay respectively.

2. The defibrillator self-checking circuit according to claim 1, wherein, The H-bridge circuit includes a first switching device, a second switching device, a third switching device, and a fourth switching device. One ends of the first switching device and the second switching device are both electrically connected to one end of the energy storage capacitor. The other end of the first switching device is electrically connected to one end of the third switching device. The other end of the second switching device is electrically connected to one end of the fourth switching device. The other ends of the third switching device, the fourth switching device, and the energy storage capacitor are all grounded. The other ends of the first switching device and the second switching device are both electrically connected to the common connection end of the first relay and the second relay.

3. The defibrillator self-checking circuit according to claim 2, wherein It further includes a first drive circuit, a second drive circuit, a third drive circuit, a fourth drive circuit, a fifth drive circuit, and a sixth drive circuit. One ends of the first drive circuit, the second drive circuit, the third drive circuit, and the fourth drive circuit are respectively electrically connected to the corresponding switching devices in the H-bridge circuit. The other ends of the first drive circuit, the second drive circuit, the third drive circuit, and the fourth drive circuit are all electrically connected to the main control circuit. One end of the fifth drive circuit is electrically connected to the first relay. One end of the sixth drive circuit is electrically connected to the second relay. The other ends of the fifth drive circuit and the sixth drive circuit are both electrically connected to the main control circuit.

4. The defibrillator self-checking circuit according to claim 2, characterized in that, It further includes a detection resistor. One end of the detection resistor is electrically connected to the other end of the third switching device, the other end of the fourth switching device, and the main control circuit respectively. The other end of the detection resistor is grounded.

5. The defibrillator self-checking circuit according to claim 3, wherein The first end and the second end of the second relay are respectively electrically connected to both ends of the test load. The third end and the fourth end of the second relay are respectively electrically connected to the first end and the second end of the first relay. The third end and the fourth end of the first relay are both used to be electrically connected to the defibrillation electrode. The fourth ends of the first relay and the second relay are respectively electrically connected to the fifth drive circuit and the sixth drive circuit.

6. The defibrillator self-test circuit according to claim 1, wherein, It further includes a voltage sampling circuit. The voltage sampling circuit is electrically connected to the energy storage capacitor and the main control circuit respectively.

7. The defibrillator self-checking circuit according to claim 6, wherein, The voltage sampling circuit includes a first resistor and a second resistor. The first resistor is electrically connected to the energy storage capacitor and one end of the second resistor respectively. The other end of the second resistor is grounded, and the common connection end of the first resistor and the second resistor is electrically connected to the main control circuit.

8. The defibrillator self-checking circuit according to claim 1, wherein It further includes a charging circuit, and the charging circuit is electrically connected to the energy storage capacitor and the main control circuit respectively.

9. The defibrillator self-checking circuit according to claim 8, wherein, It further includes a diode. The positive electrode of the diode is electrically connected to the charging circuit, and the negative electrode of the diode is electrically connected to the energy storage capacitor.

10. A defibrillator, characterized in that, It includes the defibrillator self-checking circuit according to any one of claims 1 to 9.

Images