Method, apparatus, and storage medium for improving defibrillation energy release accuracy of a defibrillation system

Abstract

The present application provides a method, device and storage medium for improving the defibrillation energy release accuracy of a defibrillation system. The method includes: obtaining the internal resistance value of the defibrillation system; obtaining the intracardiac impedance value of the patient to be defibrillated; obtaining the defibrillation energy set value input to the defibrillation system; calculating a total defibrillation energy value according to the internal resistance value of the defibrillation system, the intracardiac impedance value of the patient to be defibrillated and the defibrillation energy set value, and charging the charging capacitor of the defibrillation power supply in the defibrillation system with the total defibrillation energy value as the charging target value. The method of the present application can more accurately control the energy released to the patient's myocardium, thereby improving the defibrillation success rate and minimizing the damage to the patient's myocardium caused by defibrillation.

Description

Technical Field

[0001] The present application relates to the technical field of cardiac defibrillation, and particularly relates to a method, a device and a storage medium for improving the defibrillation energy release accuracy of a defibrillation system, a defibrillation power supply and a defibrillation system. Background Art

[0002] Cardiac arrhythmia refers to the abnormal frequency or rhythm of cardiac pulsation caused by the origin or conduction disorder of cardiac activity, and is a type of disease that seriously threatens human life and health. Currently, the commonly used method for treating cardiac arrhythmia is cardiac defibrillation, also known as cardiac cardioversion, which uses a strong pulsed current to shock the heart to instantaneously depolarize the myocardium simultaneously, eliminate ectopic rapid cardiac arrhythmia, and convert it back to sinus rhythm. Whether defibrillation is successful depends on the magnitude of the current and energy flowing through the heart during this defibrillation. The cardiac impedance of different patients is different, and the energy and current required for successful defibrillation are also different. Whether defibrillation is successful depends on whether the defibrillation current and energy exceed a certain threshold. Above this threshold, defibrillation can be successful, and below this threshold, defibrillation is not successful. However, when the defibrillation energy and current are too high, it will cause damage to the myocardium and even endanger life. Therefore, the accuracy of the released energy during defibrillation is very important. Summary of the Invention

[0003] In order to improve the accuracy of the defibrillation energy released during defibrillation, the present application provides a method for improving the defibrillation energy release accuracy of a defibrillation system, including: obtaining the internal resistance value of the defibrillation system; obtaining the intracardiac impedance value of the patient to be defibrillated; obtaining the defibrillation energy set value input to the defibrillation system; calculating the total defibrillation energy value according to the internal resistance value of the defibrillation system, the intracardiac impedance value of the patient to be defibrillated and the defibrillation energy set value, and charging the charging capacitor of the defibrillation power supply in the defibrillation system with the total defibrillation energy value as the charging target value.

[0004] Further, calculating the total defibrillation energy value according to the internal resistance value of the defibrillation system, the intracardiac impedance value of the patient to be defibrillated and the defibrillation energy set value includes:

[0005] Obtaining the total defibrillation energy value according to the following formula:

[0006]

[0007] wherein, E 总 represents the total defibrillation energy value, E 负载 represents the defibrillation energy set value, R 负载 represents the intracardiac impedance value of the patient to be defibrillated; R 内阻 represents the internal resistance value of the defibrillation system.

[0008] Further, obtaining the intracardiac impedance value of the patient to be defibrillated includes: applying an excitation current signal to the defibrillation electrodes in the defibrillation system; collecting, by the defibrillation electrodes, a response signal of the patient to be defibrillated in response to the excitation current signal; and determining the intracardiac impedance value of the patient to be defibrillated according to the response signal.

[0009] Further, obtaining the internal resistance value of the defibrillation system includes: connecting both ends of a first resistor with a known resistance value to the defibrillation electrodes in the defibrillation system; measuring the overall loop impedance value of the loop formed by the defibrillation system and the first resistor; and obtaining the internal resistance value of the defibrillation system by subtracting the known resistance value of the first resistor from the overall loop impedance value.

[0010] Further, the first resistor is a high-precision resistor.

[0011] The present application also provides a device for improving the defibrillation energy release accuracy of a defibrillation system, including a memory and a processor coupled to the memory. The processor is configured to execute the steps in the method as described above based on instructions stored in the memory.

[0012] The present application also provides a storage medium, on which an executable program is stored. When the executable program is called, the steps in the method as described above are executed.

[0013] The present application also provides a defibrillation power supply, including: an interface, which is connected to the defibrillation electrodes through a wire; a charging capacitor, which is charged by an external power supply and discharges to the defibrillation electrodes connected to the interface after charging is completed; and a processor, which is used to obtain the internal resistance value of the defibrillation system, obtain the intracardiac impedance value of the patient to be defibrillated, obtain the defibrillation energy setting value input to the defibrillation system, calculate the total defibrillation energy value according to the internal resistance value of the defibrillation system, the intracardiac impedance value of the patient to be defibrillated, and the defibrillation energy setting value, and charge the charging capacitor with the total defibrillation energy value as the charging target value.

[0014] The present application also provides a defibrillation system, including defibrillation electrodes, which are connected to a defibrillation power supply through a wire; the defibrillation power supply includes: an interface, which is connected to the defibrillation electrodes through the wire, a charging capacitor, which is charged by an external power supply and discharges to the defibrillation electrodes connected to the interface after charging is completed, and a processor, which is used to obtain the internal resistance value of the defibrillation system, obtain the intracardiac impedance value of the patient to be defibrillated, obtain the defibrillation energy setting value input to the defibrillation system, calculate the total defibrillation energy value according to the internal resistance value of the defibrillation system, the intracardiac impedance value of the patient to be defibrillated, and the defibrillation energy setting value, and charge the charging capacitor with the total defibrillation energy value as the charging target value.

[0015] According to an embodiment of the present application, the internal resistance value of the defibrillation system and the intracardiac impedance value of the patient to be defibrillated are obtained, and then calculations are performed based on the internal resistance value of the defibrillation system, the intracardiac impedance value of the patient to be defibrillated, and the defibrillation energy setting value input to the defibrillation system to obtain the total defibrillation energy value. Then, the charging capacitor of the defibrillation power supply in the defibrillation system is charged with the total defibrillation energy value as the charging target value. In this way, the influence of the internal resistance of the defibrillation system during the energy release process, including the internal resistance of the defibrillation power supply connection wires and the internal resistance of the defibrillation catheter, etc., on the defibrillation energy applied to the patient is excluded, and the accuracy of the energy actually released to the patient's myocardium, that is, the energy released between the two defibrillation electrode patches, is improved. In this manner, the energy released to the patient's myocardium can be controlled as precisely as possible, which can improve the defibrillation success rate and minimize the damage to the patient's myocardium caused by defibrillation. Description of the Drawings

[0016] The following attached drawings are part of the specification of the present application, which show embodiments of the present application. The attached drawings, together with the description of the specification, are used to explain the principle of the present application.

[0017] Figure 1 Shows a schematic diagram of a defibrillation system according to an embodiment of the present application.

[0018] Figure 2 Shows a simplified equivalent circuit diagram of a defibrillation system according to an embodiment of the present application.

[0019] Figure 3 Shows a flowchart of a method for improving the defibrillation energy release accuracy of a defibrillation system according to an embodiment of the present application. Detailed Embodiments

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the spirit of the content disclosed in the present application will be clearly described below with reference to the drawings and in detail. After any person skilled in the art in the relevant technical field understands the embodiments of the content of the present application, the techniques taught by the content of the present application can be changed and modified, which does not deviate from the spirit and scope of the content of the present application.

[0021] The illustrative embodiments of the present application and their descriptions are used to explain the present application, but are not intended to limit the present application. Additionally, elements / components using the same or similar reference numerals in the drawings and implementation manners are used to represent the same or similar parts.

[0022] Regarding the use of "first", "second",... etc. in this article, it does not particularly refer to the meaning of order or sequence, nor is it used to limit the present application. It is only used to distinguish elements or operations described with the same technical terms.

[0023] As used herein, terms such as "comprising", "including", "having", "containing", etc. are all open-ended terms, meaning including but not limited to.

[0024] As used herein, "and / or" includes any or all combinations of the stated things.

[0025] As used herein, "a plurality of" includes "two" and "more than two"; "a plurality of groups" includes "two groups" and "more than two groups".

[0026] Certain terms used to describe this application will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art regarding the description of this application.

[0027] Figure 1 A circuit schematic diagram of a defibrillation system according to an embodiment of the present application is shown. As Figure 1 shown, the defibrillation system includes a defibrillation power supply and two groups of defibrillation electrodes. The defibrillation power supply is connected to these two groups of defibrillation electrodes through wires, and the defibrillation electrodes can be used for external defibrillation or intracardiac defibrillation. When defibrillation is required, the operator inputs a defibrillation energy setting value to the defibrillation power supply, and then presses the charging switch S1. At this time, the charging switch S1 closes, and the charging capacitor C1 of the defibrillation power supply is charged by the power supply V1 until the defibrillation energy setting value input by the operator is reached. After charging is completed, the operator presses the defibrillation switch. At this time, the charging switch S1 opens, and the shock switch S2 closes, so that the energy of the charging capacitor C1 is released to the two groups of electrodes. In addition, during the defibrillation process, polarity reversal can also be performed through the commutation switches S3 and S4 to achieve biphasic wave defibrillation.

[0028] Currently, a fixed energy value is usually used for defibrillating patients. For example, the operator often inputs a fixed defibrillation energy setting value, such as 100 - 360 joules, to defibrillate the patient. This defibrillation energy setting value cannot be too low, otherwise defibrillation of the patient cannot be successful. Additionally, it cannot be too high, otherwise the stronger energy is likely to cause greater electric shock damage to the patient. At this time, the defibrillation energy setting value is determined based on the operator's experience. In addition, there are also other ways to determine the defibrillation energy used for defibrillating patients. For example, considering that the heart conditions of each patient are different, the defibrillation energy setting value can also be determined according to the intracardiac impedance value and the fixed defibrillation current value of the patient to be defibrillated. However, regardless of the method used to determine the defibrillation energy setting value, after the operator inputs this defibrillation energy setting value to the defibrillation system, the defibrillation system directly uses this defibrillation energy setting value as the charging target value to charge the charging capacitor of the defibrillation power supply, and then discharges to perform defibrillation.

[0029] However, the above process does not take into account the internal resistance of the defibrillation system, such as the internal resistance of the defibrillation power supply and the impedance of the connecting wires, etc. In fact, the internal resistance of this part will also consume the released defibrillation energy, resulting in the energy finally released to the patient's myocardium between the two defibrillation electrodes being less than the set energy initially input by the operator. Specifically, as Figure 2 shown, during the defibrillation discharge process, the internal resistance of the defibrillation system and the myocardial impedance load to be defibrillated are in a series relationship, and the internal resistance of the defibrillation system will consume part of the released defibrillation energy. Especially when the patient's myocardial impedance is small, the influence of the internal resistance is more serious, and the energy loss is also more, resulting in relatively less energy actually released to the two defibrillation electrodes.

[0030] In view of this, the embodiments of the present application provide a method for improving the defibrillation energy release accuracy of the defibrillation system, which can exclude the influence of the internal resistance of the defibrillation system on energy release, so as to accurately control the energy released to the two defibrillation electrodes. As Figure 3 shown, the method includes the following steps S1 - S5.

[0031] S1. Obtain the internal resistance value of the defibrillation system.

[0032] The defibrillation system includes a defibrillation power supply and defibrillation electrodes connected to the defibrillation power supply through wires. In addition, there are charging capacitors, switches and connecting wires between components inside the defibrillation power supply, etc. These can all constitute the internal resistance of the defibrillation system and consume the defibrillation energy released by the charging capacitor during defibrillation. Therefore, the embodiments of the present application need to obtain the resistance value of this part.

[0033] In one embodiment, obtaining the internal resistance value of the defibrillation system may include: connecting the two ends of a first resistor with a known resistance value to the defibrillation electrodes in the defibrillation system respectively; measuring the overall loop impedance value of the loop formed by the defibrillation system and the first resistor; subtracting the known resistance value of the first resistor from the overall loop impedance value to obtain the internal resistance value of the defibrillation system. Preferably, the first resistor is a high-precision resistor, and a more accurate internal resistance value of the defibrillation system can be obtained. For example, connect a 50Ω, 1‰ precision resistor between the defibrillation electrodes, and then use a measuring device to measure the impedance value of the entire loop as 55Ω, then the internal resistance value of the defibrillation system can be obtained as 55Ω - 50Ω = 5Ω.

[0034] S2. Obtain the intracardiac impedance value of the patient to be defibrillated.

[0035] For the patient to be defibrillated, it is also necessary to obtain his intracardiac impedance value.

[0036] In one embodiment, obtaining the intracardiac impedance value of a patient to be defibrillated includes: applying an excitation current signal to the defibrillation electrodes in the defibrillation system; collecting, through the defibrillation electrodes, a response signal of the patient to be defibrillated in response to the excitation current signal; and determining the intracardiac impedance value of the patient to be defibrillated based on the response signal.

[0037] Specifically, the defibrillation power supply can first generate an excitation signal of 20k - 100kHz (usually 50kHz is selected) through an excitation source, then convert the excitation signal into an excitation current signal through a constant current source and apply it to the patient to be defibrillated through the defibrillation electrodes. After that, collect, through the defibrillation electrodes, a response signal of the patient in response to the excitation signal, filter the response signal to filter out the applied excitation signal to obtain a cardiac impedance signal, and determine the intracardiac impedance value of the patient to be defibrillated based on the cardiac impedance signal.

[0038] S3. Obtain the defibrillation energy setting value input to the defibrillation system.

[0039] As described above, a fixed energy value is usually used as the defibrillation energy setting value to perform defibrillation on a patient, or the defibrillation energy setting value for performing defibrillation on a patient is determined according to the intracardiac impedance value of the patient to be defibrillated and a fixed defibrillation current value.

[0040] In one embodiment, an operator selects an energy value between 100 - 360J based on experience and inputs it into the defibrillation system as the defibrillation energy value to perform defibrillation on the patient to be defibrillated. In the embodiment of the present application, the selected defibrillation energy value is the defibrillation energy setting value.

[0041] In one embodiment, an operator calculates the defibrillation energy value according to the defibrillation current value obtained based on experience and the intracardiac impedance value of the patient to be defibrillated, and inputs the defibrillation energy value into the defibrillation system to perform defibrillation on the patient to be defibrillated. In the embodiment of the present application, the calculated defibrillation energy value is the defibrillation energy setting value.

[0042] In the prior art, after the defibrillation system obtains the input defibrillation energy setting value, it directly uses this value as the charging target value to charge the charging capacitor. After charging is completed, it releases the energy of this value to the entire circuit, and this will cause the energy actually released to the patient's myocardium to be unclear. In the embodiment of the present application, the influence of the internal resistance value of the defibrillation system is also considered, and the charging capacitor of the defibrillation power supply is not directly charged and discharged with the defibrillation energy setting value, excluding the influence of the internal resistance value of the defibrillation system, so that the defibrillation energy setting value is the energy value actually released to the two groups of defibrillation electrodes.

[0043] S4. Calculate the total defibrillation energy value according to the internal resistance value of the defibrillation system, the intracardiac impedance value of the patient to be defibrillated, and the defibrillation energy setting value.

[0044] As Figure 2 shown, during defibrillation discharge, the internal resistance of the defibrillation system and the myocardial impedance load to be defibrillated are in series, so the current flowing through at the same time is the same. According to Joule's law:

[0045] E = I 2 ×R×t,

[0046] it can be known that the energy released to the internal resistance of the defibrillation system and the myocardial impedance load is proportional to their resistance values, that is:

[0047]

[0048] wherein, E 负载 represents the energy value on the myocardial impedance load, that is, the energy value between the two sets of defibrillation electrodes. In this application, to make the energy value applied between the two sets of defibrillation electrodes equal to the input defibrillation energy setting value, so E 负载 can also represent the defibrillation energy setting value; E 内阻 represents the energy value released to the internal resistance of the defibrillation system; R 负载 represents the intracardiac impedance value of the patient to be defibrillated; R 内阻 represents the internal resistance value of the defibrillation system.

[0049] The total energy E 总 is the total defibrillation energy value, that is, the defibrillation energy value required for the entire circuit of the defibrillation system during defibrillation, and it is also the energy value that needs to be charged to the charging capacitor. Then E 总 = E 负载 + E 内阻 .

[0050] After that, according to the proportional relationship between the internal resistance of the defibrillation system and the myocardial impedance load, calculate the total defibrillation energy value:

[0051]

[0052] S5, charge the charging capacitor of the defibrillation power supply in the defibrillation system with the total defibrillation energy value as the charging target value.

[0053] After obtaining the total defibrillation energy value, use this value as the charging target value to charge the charging capacitor of the defibrillation power supply in the defibrillation system. When discharging, it can ensure that the defibrillation energy setting value input to the defibrillation system is the energy value that is truly released between the two sets of defibrillation electrodes and truly acts on the patient's myocardium. In this way, the released energy can be controlled as precisely as possible, excluding the influence of the machine. On the premise of ensuring defibrillation success, the defibrillation energy and current can be reduced as much as possible, thereby reducing the risk of damage to the patient's myocardium and further reducing the risk of related surgeries. In addition, controlling the energy accuracy between the two sets of defibrillation electrode pads also helps to more precisely study the dose-effect relationship between defibrillation energy, voltage, current, and defibrillation success in the future, excluding the influence of different internal resistances of different machines, thereby further improving the defibrillation success rate.

[0054] The embodiment of the present application also provides a device for improving the defibrillation energy release accuracy of a defibrillation system, including a memory and a processor coupled to the memory. The processor is configured to execute the method steps in any one of the embodiments of the present application based on the instructions stored in the memory.

[0055] Among them, the memory can be a system memory or a fixed non-volatile storage medium, etc. The system memory can store an operating system, application programs, a boot loader, a database, and other programs.

[0056] The embodiment of the present application also provides a computer-readable storage medium, such as a memory including a computer program. The above computer program can be executed by a processor to complete the method steps in any one of the embodiments of the present application.

[0057] The embodiment of the present application also provides a defibrillation power supply, including: an interface, the interface is connected to the defibrillation electrode through a wire; a charging capacitor, the charging capacitor is charged by an external power supply and discharges to the defibrillation electrode connected to the interface after charging is completed; and a processor, configured to obtain the internal resistance value of the defibrillation system, obtain the intracardiac impedance value of the patient to be defibrillated, obtain the defibrillation energy setting value input to the defibrillation system, calculate the total defibrillation energy value according to the internal resistance value of the defibrillation system, the intracardiac impedance value of the patient to be defibrillated, and the defibrillation energy setting value, and charge the charging capacitor with the total defibrillation energy value as the charging target value.

[0058] The above processor can execute the method steps in any one of the embodiments of the present application.

[0059] An embodiment of the present application further provides a defibrillation system, including: a defibrillation electrode, which is connected to a defibrillation power supply through a wire; a defibrillation power supply, including: an interface, which is connected to the defibrillation electrode through the wire, a charging capacitor, which is charged by an external power supply and discharges to the defibrillation electrode connected to the interface after charging is completed, and a processor, which is used to obtain the internal resistance value of the defibrillation system, obtain the intracardiac impedance value of the patient to be defibrillated, obtain the defibrillation energy setting value input to the defibrillation system, calculate the total defibrillation energy value according to the internal resistance value of the defibrillation system, the intracardiac impedance value of the patient to be defibrillated, and the defibrillation energy setting value, and charge the charging capacitor with the total defibrillation energy value as the charging target value.

[0060] The above-mentioned processor can execute the method steps in any one of the embodiments of the present application.

[0061] The above are only schematic specific implementation manners of the present application. Without departing from the concept and principle of the present application, any equivalent changes and modifications made by any person skilled in the art shall fall within the scope of protection of the present application.

Claims

1. A method for improving the defibrillation energy release accuracy of a defibrillation system, characterized in that, including: obtaining the internal resistance value of the defibrillation system; obtaining the intracardiac impedance value of the patient to be defibrillated; obtaining the defibrillation energy setting value input to the defibrillation system; calculating a total defibrillation energy value based on the internal resistance value of the defibrillation system, the intracardiac impedance value of the patient to be defibrillated, and the defibrillation energy setting value; and charging the charging capacitor of the defibrillation power supply in the defibrillation system with the total defibrillation energy value as the charging target value, wherein calculating the total defibrillation energy value based on the internal resistance value of the defibrillation system, the intracardiac impedance value of the patient to be defibrillated, and the defibrillation energy setting value includes: obtaining the total defibrillation energy value according to the following formula: Among them, E 总 represents the total defibrillation energy value, E 负载 represents the defibrillation energy setting value, R 负载 represents the intracardiac impedance value of the patient to be defibrillated; R 内阻 represents the internal resistance value of the defibrillation system.

2. The method according to claim 1, wherein obtaining the intracardiac impedance value of the patient to be defibrillated includes: applying an excitation current signal to the defibrillation electrodes in the defibrillation system; collecting a response signal of the patient to be defibrillated in response to the excitation current signal through the defibrillation electrodes; and determining the intracardiac impedance value of the patient to be defibrillated according to the response signal.

3. The method according to claim 1, wherein obtaining the internal resistance value of the defibrillation system includes: connecting two ends of a first resistor with a known resistance value to the defibrillation electrodes in the defibrillation system respectively; measuring the overall loop impedance value of the loop formed by the defibrillation system and the first resistor; and subtracting the known resistance value of the first resistor from the overall loop impedance value to obtain the internal resistance value of the defibrillation system.

4. The method according to claim 3, characterized in that, The first resistor is a high-precision resistor.

5. A device for improving the defibrillation energy release accuracy of a defibrillation system, characterized in that including a memory and a processor coupled to the memory, the processor being configured to execute the steps in the method according to any one of claims 1-4 based on instructions stored in the memory.

6. A storage medium, characterized in that, storing an executable program thereon, and when the executable program is called, executing the steps in the method according to any one of claims 1-4.

7. A defibrillation power supply, characterized in that, including: an interface, the interface being connected to the defibrillation electrodes through a wire; a charging capacitor, the charging capacitor being charged through an external power supply and discharging to the defibrillation electrodes connected to the interface after charging; and a processor for obtaining the internal resistance value of the defibrillation system, obtaining the intracardiac impedance value of the patient to be defibrillated, obtaining the defibrillation energy setting value input to the defibrillation system, calculating a total defibrillation energy value based on the internal resistance value of the defibrillation system, the intracardiac impedance value of the patient to be defibrillated, and the defibrillation energy setting value, and charging the charging capacitor with the total defibrillation energy value as the charging target value, wherein calculating the total defibrillation energy value based on the internal resistance value of the defibrillation system, the intracardiac impedance value of the patient to be defibrillated, and the defibrillation energy setting value includes: obtaining the total defibrillation energy value according to the following formula: Wherein, E 总 represents the total defibrillation energy value, and E 负载 represents the defibrillation energy setting value, and R 负载 represents the intracardiac impedance value of the patient to be defibrillated; and R 内阻 represents the internal resistance value of the defibrillation system.

8. A defibrillation system, characterized in that, including: defibrillation electrodes, the defibrillation electrodes being connected to the defibrillation power supply through a wire; a defibrillation power supply, including: an interface, the interface being connected to the defibrillation electrodes through the wire; a charging capacitor, the charging capacitor being charged through an external power supply and discharging to the defibrillation electrodes connected to the interface after charging; and A processor, configured to obtain the internal resistance value of a defibrillation system, obtain the intracardiac impedance value of a patient to be defibrillated, obtain the defibrillation energy setting value input to the defibrillation system, calculate a total defibrillation energy value based on the internal resistance value of the defibrillation system, the intracardiac impedance value of the patient to be defibrillated, and the defibrillation energy setting value, and charge the charging capacitor with the total defibrillation energy value as a charging target value, wherein calculating the total defibrillation energy value based on the internal resistance value of the defibrillation system, the intracardiac impedance value of the patient to be defibrillated, and the defibrillation energy setting value includes: Obtaining the total defibrillation energy value according to the following formula: Among them, E 总 represents the total defibrillation energy value, and E 负载 represents the defibrillation energy setting value, and R 负载 represents the intracardiac impedance value of the patient to be defibrillated; and R 内阻 represents the internal resistance value of the defibrillation system.

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