Self-recovery defibrillation discharge isolation over-current protection circuit

Abstract

The utility model relates to the technical field of medical equipment, and discloses a self-recovery defibrillation discharge isolation overcurrent protection circuit, which comprises a discharge circuit, a first processing module, a control module and a second processing module, and is characterized in that the second processing module is provided with an overcurrent protection release key; discharging current of the discharging circuit is transmitted to the first processing module, current and voltage values processed by the first processing module are output to the control module, and the control module generates a first control signal according to the processed current and voltage values to control the discharging state of the discharging circuit. The second processing module receives a pressing instruction, and when the pressing instruction is received, the control module generates a second control signal to control the discharging circuit to recover discharging, so that the over-current protection relieving key can be pressed down after an accident of over-current protection caused by correction is eliminated, the over-current protection of the circuit can be relieved in time, and defibrillation rescue measures on a patient can be recovered; the on-off time of the defibrillator is saved, and the over-current protection circuit can be quickly self-recovered and defibrillated.

Description

Technical Field

[0001] The present application relates to the technical field of medical instruments, and in particular to an isolation overcurrent protection circuit for self-recovering defibrillation discharge. Background Art

[0002] Patients' cardiac fibrillation is equivalent to cardiac arrest, which seriously threatens the patient's life. Every second counts in the rescue and defibrillation measures for the patient. However, in some unexpected situations, the patient's body is sweaty, damp, the electrode is installed incorrectly and short-circuited, etc., which may cause the current exceeding the limit to be generated, threatening the patient or burning the defibrillator's discharge device IGBT. Therefore, the existing defibrillator circuit will set a forced overcurrent protection mechanism. In extreme unexpected situations, the current exceeding the limit is generated, such as exceeding 140A, the circuit outputs a high level, and the drive circuit forces the discharge device IGBT to be closed, thereby disconnecting the discharge circuit to achieve the purpose of overcurrent protection.

[0003] However, the current existing technology requires that when a patient causes the circuit to enter overcurrent protection under accidental circumstances, the defibrillator needs to be shut down and restarted to release the overcurrent protection after eliminating and correcting the accidental situation causing the overcurrent protection. Since it takes a certain amount of time to turn the defibrillator on and off, this will waste the golden time for rescuing the patient and seriously delay the efficiency of treatment. Utility Model Content

[0004] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0005] The utility model provides an isolated overcurrent protection circuit for self-restoring defibrillation discharge, which is used to solve the problem that the defibrillator circuit in the prior art causes the circuit to enter an overcurrent protection state in an accidental situation for a patient, and after eliminating and correcting the accidental situation causing the overcurrent protection, the defibrillator needs to be shut down and restarted to release the overcurrent protection, which wastes the golden time for rescuing the patient and seriously delays the efficiency of treatment.

[0006] The utility model provides an isolated overcurrent protection circuit for self-recovering defibrillation discharge, comprising a discharge circuit, a first processing module, a control module and a second processing module, wherein the second processing module is provided with an overcurrent protection release button; the discharge current of the discharge circuit is transmitted to the first processing module, the current and voltage values ​​processed by the first processing module are output to the control module, and the control module generates a first control signal to control the discharge state of the discharge circuit according to the processed current and voltage values; the second processing module receives a pressing instruction, and when the pressing instruction is received, the control module generates a second control signal to control the discharge circuit to resume discharge.

[0007] In some embodiments, the first processing module includes an isolation amplifier, a current sensing amplifier, a filter, and a comparator; the control module includes a trigger and an MCU; and the second processing module includes an overcurrent protection release button.

[0008] In some embodiments, the output end of the discharge circuit is electrically connected to the input end of the first processing module, the output end of the first processing module is electrically connected to the input end of the control module, the output end of the control module is electrically connected to the input end of the discharge circuit, and the output end of the second processing module is electrically connected to the input end of the control module.

[0009] In some embodiments, the output end of the discharge circuit is connected to the input end of the isolation amplifier, the output end of the isolation amplifier is connected to the input end of the current sensing amplifier, the output end of the current sensing amplifier is connected to the input end of the filter, the output end of the filter is connected to the input end of the comparator, the output end of the comparator is connected to the input end of the trigger, the output end of the trigger is connected to the input end of the MCU, and the output end of the MCU is connected to the input end of the discharge circuit.

[0010] In some embodiments, the isolation amplifier receives the voltage signal converted from the discharge current of the discharge circuit, isolates the voltage signal and transmits it to the current sensing amplifier. The current sensing amplifier amplifies the current and voltage amplitudes and transmits the amplified current and voltage amplitudes to the filter. The filter outputs an electrical signal to the comparator. The comparator compares the received electrical signal with a preset voltage value and obtains a comparison result. The comparator transmits the comparison result to the trigger. The trigger outputs a first control signal according to the comparison result. The trigger transmits the first control signal to the MCU. The MCU controls the discharge state of the discharge circuit.

[0011] In some embodiments, the trigger outputs a first control signal based on the comparison result, including: when the value of the electrical signal is greater than a preset voltage value, the first control signal is output as a high level to shut down the circuit; when the value of the electrical signal is less than the preset voltage value, the first control signal is output as a low level and the device discharges normally.

[0012] In some embodiments, when the value of the electrical signal is greater than a preset voltage value, after outputting the first control signal as a high level to shut down the circuit, it also includes: a second processing module receives a pressing instruction, and when receiving the pressing instruction, the control module generates a second control signal to control the discharge circuit to resume discharge.

[0013] The isolated overcurrent protection circuit for self-recovering defibrillation discharge provided by the embodiment of the present disclosure includes a discharge circuit, a first processing module, a control module and a second processing module, and the second processing module is provided with an overcurrent protection release button. The discharge current of the discharge circuit is transmitted to the first processing module, and the current and voltage values ​​processed by the first processing module are output to the control module. The control module generates a first control signal to control the discharge state of the discharge circuit according to the processed current and voltage values; the second processing module receives a pressing instruction, and when receiving the pressing instruction, the control module generates a second control signal to control the discharge circuit to resume discharge. The isolated overcurrent protection circuit for self-recovering defibrillation discharge can press the overcurrent protection release button after eliminating and correcting the unexpected situation causing the overcurrent protection, so as to release the overcurrent protection of the circuit in time and resume the defibrillation rescue measures for the patient, saving the time of turning on and off the defibrillator, and enabling the overcurrent protection circuit to quickly self-recover defibrillate.

[0014] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0016] Figure 1 It is a structural schematic diagram of an isolated overcurrent protection circuit for self-recovering defibrillation discharge.

[0017] Figure 2 The invention is a block diagram of an isolation overcurrent protection circuit for self-recovering defibrillation discharge.

[0018] Reference numerals:

[0019] Discharge circuit-1; first processing module-2; control module-3; second processing module-4; driver-5, driver-6, driver-8, driver-9; isolation amplifier-10; current sensing amplifier-11; filter-12; comparator-13; trigger-14; MCU-15; overcurrent protection release button-16. DETAILED DESCRIPTION

[0020] In order to be able to more thoroughly understand the features and technical contents of the embodiments of the present disclosure, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, multiple details are provided to provide a full understanding of the disclosed embodiments; however, one or more embodiments can still be implemented without these details. In other cases, in order to simplify the drawings, well-known structures and devices can be simplified for display.

[0021] In the description of the present application, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0022] The specific implementation is described below with reference to the accompanying drawings.

[0023] For example, see Figure 1 As shown, it is a structural schematic diagram of an isolated overcurrent protection circuit for self-recovering defibrillation discharge provided in an embodiment of the present application, including a discharge circuit 1, a first processing module 2, a control module 3 and a second processing module 4.

[0024] The output end of the discharge circuit is electrically connected to the input end of the first processing module, the output end of the first processing module is electrically connected to the input end of the control module, the output end of the control module is electrically connected to the input end of the discharge circuit, and the output end of the second processing module is electrically connected to the input end of the control module.

[0025] The discharge current of the discharge circuit is transmitted to the first processing module, and the current and voltage values ​​processed by the first processing module are output to the control module. The control module generates a first control signal to control the discharge state of the discharge circuit according to the processed current and voltage values; the second processing module receives a pressing instruction, and when receiving the pressing instruction, the control module generates a second control signal to control the discharge circuit to resume discharge.

[0026] The first processing module includes an isolation amplifier, a current sensing amplifier, a filter, and a comparator; the control module includes a trigger and an MCU; and the second processing module includes an overcurrent protection release button.

[0027] In some embodiments, the flip-flop is a D-flip-flop. The filter includes an RC filter and an LC filter.

[0028] See also Figure 2As shown, it is a block diagram of an isolated overcurrent protection circuit for self-recovering defibrillation discharge provided by an embodiment of the present application. The discharge circuit includes four IGBT tubes, including four discharge circuits of K1, K2, K3, and K4. Drivers 5, 6, 8, and 9 are four IGBTs corresponding to four gate drive chips respectively. The reverse ends of the four gate drive chips are controlled by the D trigger output control signal DQ. When DQ is at a low level, the output level of the gate drive chip is determined by the MCU control level H1, L1, H2, and L2 of the forward terminal. When controlling the normal defibrillation waveform human body discharge, the MCU output controls the forward ends of the four gate drive chips U9, U10, U18, and U19. To specifically open a specific IGBT tube, the corresponding high level is output to the positive end of the corresponding gate drive chip, so that the gate drive chip outputs a high level to control the opening of the corresponding IGBT tube. When the defibrillation waveform discharges forward to the human body, K1 and K4 are turned on, K2 and K3 are turned off, and the forward high-voltage defibrillation waveform flows back to the ground plane through K1, the human body, K4, and the collection resistor R54 to form a loop. When the defibrillation waveform discharges backward to the human body, K2 and K3 are turned on, K1 and K4 are turned off, and the reverse high-voltage defibrillation waveform flows back to the ground plane through K2, the human body, K3, and the collection resistor R54 to form a loop.

[0029] In some embodiments, the output end of the discharge circuit is connected to the input end of the isolation amplifier, the output end of the isolation amplifier is connected to the input end of the current sensing amplifier, the output end of the current sensing amplifier is connected to the input end of the filter, the output end of the filter is connected to the input end of the comparator, the output end of the comparator is connected to the input end of the trigger, the output end of the trigger is connected to the input end of the MCU, and the output end of the MCU is connected to the input end of the discharge circuit.

[0030] See also Figure 2 As shown, the output end of the discharge circuit 1 is connected to the input end of the isolation amplifier 10, the output end of the isolation amplifier 10 is connected to the input end of the current sensing amplifier 11, the output end of the current sensing amplifier 11 is connected to the input end of the filter 12, the output end of the filter 12 is connected to the input end of the comparator 13, the output end of the comparator 13 is connected to the input end of the trigger 14, the output end of the trigger 14 is connected to the input end of the MCU 15, and the output end of the MCU 15 is connected to the input end of the discharge circuit.

[0031] In some embodiments, the isolation amplifier receives the voltage signal converted from the discharge current of the discharge circuit, isolates the voltage signal and transmits it to the current sensing amplifier. The current sensing amplifier amplifies the current and voltage amplitudes and transmits the amplified current and voltage amplitudes to the filter. The filter outputs an electrical signal to the comparator. The comparator compares the received electrical signal with a preset voltage value and obtains a comparison result. The comparator transmits the comparison result to the trigger. The trigger outputs a first control signal according to the comparison result. The trigger transmits the first control signal to the MCU. The MCU controls the discharge state of the discharge circuit.

[0032] In some embodiments, when the discharge current exceeds a preset limit, the voltage on the current and voltage collection resistor will also increase, and then after the subsequent isolation amplifier, current sensing amplifier, RC, and LC filtering, it will be compared with the reference voltage of the comparator and exceed the preset reference voltage. The comparator outputs a high level to the CLK terminal of the D flip-flop to form a trigger voltage, causing the D flip-flop to flip and output a high level to the reverse terminal DQ of the four gate drive chips, forcing U9, U10, U18, and U19 to output a low level to the gates of the four IGBTs, turning off all IGBT tubes and no longer discharging to the human body, thereby achieving the purpose of overcurrent protection.

[0033] Among them, the isolation amplifier 10 plays the role of electrical isolation. When the bidirectional waveform is discharged from the human body, the discharge current of the defibrillator is very large, and the instantaneous high-frequency current of tens to hundreds of amperes is injected into the defibrillator ground plane HVGND through the acquisition resistor R54. The HVGND ground loop current will cause the acquisition current and voltage signal path and even the entire defibrillator signal path to have a lot of ground noise. The voltage drop formed at both ends of the current and voltage acquisition resistor R54 on the high-voltage side of the isolation amplifier 10 is connected. Through the isolation amplifier 10, the output and input circuits are separated by a capacitor isolation layer with extremely strong anti-electromagnetic interference performance, so that the input high-voltage side VIN and GND1 of U16 are isolated from the output and GND2 on the low-voltage side, so that the discharge return of the high-voltage and large-current is completely separated from the system ground behind, protecting the defibrillator system from the influence of the potential difference of the high-voltage and large-current discharge ground loop.

[0034] In some embodiments, a current sensing amplifier with gain amplification is added to the circuit board to amplify the current and voltage amplitudes collected by the sampling resistor, ensure sufficient current and voltage amplitudes for subsequent comparator identification, and reduce the power borne by the current and voltage sampling resistor in the circuit. The current and voltage waveforms amplified by the current sensing amplifier 11 are bidirectional pulse waves following defibrillation discharge, and the pulse wave frequency is relatively large. For example, it is 4KHZ, and the pulse width is 120us. The voltage pulse waveform collected by the current and voltage sampling resistor is also a voltage pulse waveform with a very small amplitude, which is not conducive to the comparison and use of the subsequent comparator. An RC filtering circuit is added and an RC low-pass filter with a cut-off frequency of 3.3KHZ is formed. The collected 4KHZ pulse voltage waveform is reduced by 3dB after passing through the RC low-pass filter, and then the remaining pulse wave is smoothed through the LC filter to form a smoother linear voltage waveform output to the input end of the subsequent comparator. The linear collection voltage IN output by the LC filter is input to the positive terminal IN+ of the comparator 13 and compared with the preset 2.2V voltage of the reverse terminal IN-. When the voltage value of the positive terminal IN+ of U14 is less than 2.2V of the reverse terminal IN-, the comparator OUT outputs a low level. When the voltage value of the positive terminal IN+ of U14 is greater than 2.2V of the reverse terminal IN-, the comparator OUT outputs a high level, triggering the D flip-flop of the subsequent stage to flip.

[0035] When the power is turned on and the CLK terminal of the first pin is low, the D flip-flop outputs a low level to DQ by default, which means that the reverse ends of the four gate drive chips U9, U10, U18, and U19 in the discharge circuit above are low. At this time, there is no overcurrent protection, and the defibrillation discharge can be controlled normally. When the defibrillator causes the discharge current to exceed the limit in extreme accidental circumstances (the patient's body is sweating, damp, the electrode sheet is installed incorrectly and short-circuited, etc.), the CLK terminal input of the first pin of the D flip-flop is high, and the CLK high-level signal triggers the D flip-flop output to flip from a low level to a high level to the reverse ends of the four gate drive chips U9, U10, U18, and U19 in the discharge circuit, making the outputs all low, so that the corresponding 4 discharge IGBTs are all turned off, achieving the purpose of overcurrent protection.

[0036] In some embodiments, the trigger outputs a first control signal according to the comparison result, including: when the value of the electrical signal is greater than the preset voltage value, the first control signal is output as a high level to shut down the circuit; when the value of the electrical signal is less than the preset voltage value, the first control signal is output as a low level, and the device discharges normally. When the value of the electrical signal is greater than the preset voltage value, after the first control signal is output as a high level to shut down the circuit, it also includes: the second processing module receives a press instruction, and when the press instruction is received, the control module generates a second control signal to control the discharge circuit to resume discharge. The 43rd pin of the MCU is connected to the output terminal DQ of the D trigger. When the defibrillation discharge can be performed normally, the output DQ of the D trigger is a low level. When the MCU reads DQ as a low level, it indicates that the discharge circuit has not entered the overcurrent protection. When the defibrillator is in extreme accidental conditions, including but not limited to sweating, moisture, incorrect installation of the electrode sheet, short circuit, etc., causing the discharge current to exceed the limit, the output DQ of the D trigger is flipped from a low level to a high level, so that the four gate drive chips U9, U10, U18, and U19 output a low level to shut down the discharge tube IGBT, and the defibrillator enters the overcurrent protection state. After the rescue medical staff eliminates and corrects the extreme accident caused by the correction and there is no longer a danger of overcurrent discharge, the medical staff presses the overcurrent protection release button 16, which can make the MCU's 42nd pin low. The MCU recognizes this low-level signal and determines that the extreme accident that caused the defibrillator's overcurrent protection has been eliminated and corrected. The MCU controls the CLR of the 39th pin to be low and to the set 0 end of the D flip-flop, so that the D flip-flop output DQ is flipped from a high level to a low level, releasing the overcurrent protection. At the same time, after the D flip-flop flips and outputs a low level, the MCU flips the CLR of the 39th pin from a low level to a high level, so that the overcurrent protection circuit enters the next protection cycle. The MCU cooperates with the overcurrent protection release button to control the D flip-flop to flip, so that the defibrillator can continue to perform defibrillation measures on the rescued patient without restarting the machine after overcurrent protection. The entire circuit achieves the purpose of self-recovery defibrillation after overcurrent protection in extreme accidental situations.

[0037] The utility model sets an overcurrent protection release button in the second processing module, the discharge current of the discharge circuit is transmitted to the first processing module, the current and voltage values ​​processed by the first processing module are output to the control module, and the control module generates a first control signal to control the discharge state of the discharge circuit according to the processed current and voltage values; the second processing module receives a pressing instruction, and when receiving the pressing instruction, the control module generates a second control signal to control the discharge circuit to resume discharge. The self-recovering defibrillation discharge isolation overcurrent protection circuit can press the overcurrent protection release button after eliminating and correcting the unexpected situation causing the overcurrent protection, timely release the circuit overcurrent protection, and resume defibrillation rescue measures for the patient, saving the time of turning the defibrillator on and off, and enabling the overcurrent protection circuit to quickly self-recover defibrillate.

[0038] The present utility model is not limited to the above specific implementation modes. The above shows and describes the basic principles, main features and advantages of the present application. It should be understood by those skilled in the art that the present application is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application. These changes and improvements fall within the scope of the present application to be protected. The scope of protection claimed in the present application is defined by the attached claims and their equivalents.

[0039] In the embodiments disclosed herein, the described embodiments are merely illustrative. Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software may depend on the specific application and design constraints of the technical solution. The technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the embodiments disclosed herein.

Claims

1. An isolated overcurrent protection circuit for self-recovering defibrillation discharge, comprising a discharge circuit, a first processing module, a control module and a second processing module, characterized in that: The second processing module is provided with an overcurrent protection release button; the discharge current of the discharge circuit is transmitted to the first processing module, and the current and voltage values ​​processed by the first processing module are output to the control module, and the control module generates a first control signal according to the processed current and voltage values ​​to control the discharge state of the discharge circuit; The second processing module receives a pressing instruction. When the pressing instruction is received, the control module generates a second control signal to control the discharge circuit to resume discharge.

2. The self-restoring defibrillation discharge isolation overcurrent protection circuit according to claim 1, characterized in that: The first processing module includes an isolation amplifier, a current sensing amplifier, a filter, and a comparator; the control module includes a trigger and an MCU; and the second processing module includes an overcurrent protection release button.

3. The self-restoring defibrillation discharge isolation overcurrent protection circuit according to claim 1, characterized in that: The output end of the discharge circuit is electrically connected to the input end of the first processing module, the output end of the first processing module is electrically connected to the input end of the control module, the output end of the control module is electrically connected to the input end of the discharge circuit, and the output end of the second processing module is electrically connected to the input end of the control module.

4. The self-restoring defibrillation discharge isolation overcurrent protection circuit according to claim 2, characterized in that: The output end of the discharge circuit is connected to the input end of the isolation amplifier, the output end of the isolation amplifier is connected to the input end of the current sensing amplifier, the output end of the current sensing amplifier is connected to the input end of the filter, the output end of the filter is connected to the input end of the comparator, the output end of the comparator is connected to the input end of the trigger, the output end of the trigger is connected to the input end of the MCU, and the output end of the MCU is connected to the input end of the discharge circuit.

5. The self-restoring defibrillation discharge isolation overcurrent protection circuit according to claim 4, characterized in that: The isolation amplifier receives the voltage signal converted from the discharge current of the discharge circuit, isolates it and transmits the current and voltage signals to the current sensing amplifier. The current sensing amplifier amplifies the current and voltage amplitudes and transmits the amplified current and voltage amplitudes to the filter. The filter outputs an electrical signal to the comparator. The comparator compares the received electrical signal with a preset voltage value and obtains a comparison result. The comparator transmits the comparison result to the trigger. The trigger outputs a first control signal according to the comparison result. The trigger transmits the first control signal to the MCU. The MCU controls the discharge state of the discharge circuit.

6. The self-restoring defibrillation discharge isolation overcurrent protection circuit according to claim 5, characterized in that: The trigger outputs a first control signal according to the comparison result, including: when the value of the electrical signal is greater than the preset voltage value, the first control signal is output as a high level to shut down the circuit; when the value of the electrical signal is less than the preset voltage value, the first control signal is output as a low level and the device discharges normally.

7. The self-restoring defibrillation discharge isolation overcurrent protection circuit according to claim 6, characterized in that: When the value of the electrical signal is greater than the preset voltage value, after outputting the first control signal as a high level to shut down the circuit, it also includes: the second processing module receives a pressing instruction, and when receiving the pressing instruction, the control module generates a second control signal to control the discharge circuit to resume discharge.

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