Intracardiac defibrillation electrical device, intracardiac defibrillation catheter system, and inspection method for intracardiac defibrillation electrical device

Abstract

Provided is an electrical device (1) for intracardiac defibrillation, having: a capacitor (2) for accumulating charge; a load resistor Rb, which is electrically connected to the capacitor (2) and to which a discharge current from the capacitor (2) flows, and which moreover has a resistance value higher than 50 Ω; a measurement unit (3) for acquiring the voltage of the capacitor (2), the measurement unit (3) being electrically connected to the capacitor (2); and an estimation unit (5) for using the voltage value of the capacitor (2) after the capacitor (2), having accumulated a prescribed charge, discharges to the load resistor Rb, to calculate the discharge energy occurring in cases where the capacitor (2), having accumulated a prescribed charge, discharges to a prescribed simulated resistor Ra that has a resistance value lower than that of the load resistor Rb and that simulates a human heart.

Description

Technical Field

[0001] The present invention relates to an electrical device used for defibrillation in the heart cavity, an intracardiac defibrillation catheter system including the electrical device, and a method for checking whether there is a problem in the operation of the electrical device before defibrillation of a living body.

Background Art

[0002] In the treatment of arrhythmias such as atrial fibrillation and ventricular fibrillation, defibrillation is performed to return the rhythm of the heart to normal by applying electrical stimulation. As a device for performing defibrillation, in addition to an external defibrillator, an intracardiac defibrillator that can use a lower-energy voltage waveform compared to an external defibrillator and can reduce the burden on the patient can be mentioned. When using a defibrillator, it is necessary to perform a check to confirm whether it operates normally, for example, whether it can appropriately apply energy to a 50Ω load resistor simulating the human body.

[0003] Patent Document 1 discloses a defibrillator equipped with an automatic self-test system. The defibrillator has a high-voltage transmission system including a capacitor, and monitors the voltage and current during discharge of the capacitor.

[0004] Patent Document 2 discloses that by setting an intracardiac defibrillation catheter system to a test mode, it is possible to confirm whether the power supply device operates normally, or whether a predetermined energy can be applied when the defibrillation catheter is connected to an internal resistance.

[0005] Patent Document 3 discloses that when maintaining an electrical stimulation device or a defibrillator, an electrical pulse is applied to an internal resistance, and the applied energy is calculated and displayed from the terminal voltage of the capacitor before and after the application.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0007] According to the defibrillator of Patent Document 1, it is possible to confirm whether the overcurrent detection function and the overvoltage detection function operate properly, but it is not intended to confirm whether the energy applied to the load resistor is appropriate. Further, Patent Document 2 does not disclose a specific method for confirming whether a predetermined energy can be applied to an intracardiac defibrillation catheter system. In the inspection of the defibrillator, a predetermined energy may be continuously discharged to the load resistor a plurality of times. However, when the defibrillator of Patent Document 3 is continuously discharged to the internal resistance simulating the human heart, the internal resistance may overheat and be damaged. Therefore, an object of the present invention is to provide an intracardiac defibrillation electrical device, an intracardiac defibrillation catheter system, and a method for inspecting an intracardiac defibrillation electrical device that can calculate the discharge energy applied to a living body during defibrillation while suppressing the heat generation of the load resistor.

Means for Solving the Problems

[0008] One embodiment of the intracardiac defibrillation electrical device of the present invention that can achieve the above object is: a capacitor that stores electric charge; a load resistor R that is electrically connected to the capacitor, through which the discharge current from the capacitor flows, and whose resistance value is higher than 50Ω b and; a measurement unit that is electrically connected to the capacitor and acquires the voltage of the capacitor; after the capacitor storing a predetermined charge discharges to the load resistor R b using the value of the voltage of the capacitor, a predetermined simulation resistor R that simulates the human heart and has a lower resistance value than the load resistor R b when the capacitor storing a predetermined charge discharges to aIt has a feature in that it has an estimation unit that calculates the discharge energy that would occur if discharging were taking place with respect to; In the above-mentioned intracardiac defibrillation electrical device, the load resistance R b Using the value of the voltage of the capacitor after discharging with respect to, the simulated resistance R a Calculates the discharge energy that is estimated to occur if discharging is taking place with respect to. The load resistance R b Is a simulated resistance R that simulates the human heart a Since it has a higher resistance value than, even if a predetermined energy is discharged to the load resistance R b Multiple times continuously, it is possible to suppress the heat generation of the load resistance R b And the risk of damage due to overheating of the load resistance R b Can also be reduced.

[0009] In the above-mentioned intracardiac defibrillation electrical device, the measurement unit measures the voltage V0 of the capacitor before the start of discharging of the capacitor with respect to the load resistance R b And the voltage V of the capacitor at a first predetermined time T a After from the start of discharging of the capacitor, and the estimation unit calculates the capacitance C of the capacitor by the following formula (1), and the simulated resistance R by the following formula (2) ab The voltage V of the capacitor at a first predetermined time T a After from the start of discharging of the capacitor with respect to is calculated, and the capacitor is simulated resistance R by the following formula (3) a The voltage V of the capacitor at a first predetermined time T a When discharging for, it is preferable to calculate the discharge energy E a Of the capacitor with respect to for a first predetermined time T a When discharging. s

[0010]

Number

[0011]

Number

[0012]

Number

[0013] However, in the above formulas (1) to (3), r is the loss resistance existing in the intracardiac defibrillation electrical device other than the load resistance R b and e is the Napier's number.

[0014] In the intracardiac defibrillation electrical device, the measurement unit measures the voltage V0 of the capacitor before the start of discharge of the capacitor with respect to the load resistance R b and the voltage V a of the capacitor at a first predetermined time T ab after the start of discharge of the capacitor, and the estimation unit calculates the capacitance C of the capacitor according to the following formula (1) and calculates the discharge energy E s according to the following formula (4), which is preferable.

[0015]

Equation

[0016]

Equation

[0017] However, in the above formulas (1) and (4), r is the loss resistance existing in the intracardiac defibrillation electrical device other than the load resistance R b and e is the Napier's number.

[0018] The intracardiac defibrillation electrical device further includes: a control unit connected to the capacitor and the measurement unit for controlling the charging and discharging of the capacitor; an input reception unit connected to the control unit for receiving an input operation for setting a set energy E0 to be applied to the load resistance R b from the user; and a warning unit for issuing a warning to the user. The control unit compares the reference energy E1 within a predetermined range determined based on the set energy E0 input by the input reception unit with the discharge energy E s and the warning unit compares the discharge energy E sIt is preferable that a warning is issued when it decreases.

[0019] The intracardiac defibrillation electrical device further includes: a power supply unit connected to the capacitor and generating an applied voltage; a load resistor R b connected to the capacitor on the power supply unit side rather than, the load resistor R b a discharge resistor R for discharging the remaining energy of the capacitor after application to the load resistor R c It is preferable to have.

[0020] In the intracardiac defibrillation electrical device, the measurement unit measures the voltage V b of the capacitor at a third predetermined time T c after the start of discharge of the capacitor with respect to the load resistor R c and the estimation unit calculates the discharge energy E c when the capacitor discharges for a third predetermined time T b with respect to the load resistor R c and the discharge resistor R c and it is preferable to compare the discharge energy E r with the discharge energy E s and the discharge energy E r It is preferable to compare.

[0021]

Equation

[0022] In the intracardiac defibrillation electrical device, the measurement unit measures the voltage V b of the capacitor at a third predetermined time T c after the start of discharge of the capacitor with respect to the load resistor R c and the estimation unit calculates the discharge energy E c when the capacitor discharges for a third predetermined time T b with respect to the load resistor R c and the discharge resistor R c and the estimation unit calculates the discharge energy E r when the capacitor discharges for a third predetermined time T s and compares the discharge energy E rIt is preferable to compare with.

[0023]

Number

[0024] In the above intracardiac defibrillation electrical device, the discharge resistor R c The resistance value of is preferably equal to or greater than the resistance value of the simulation resistor R a

[0025] In the above intracardiac defibrillation electrical device, the resistance value of the load resistor R b Is preferably equal to the resistance value of the discharge resistor R c

[0026] In the above intracardiac defibrillation electrical device, it is preferable that the calculation of the discharge energy by the estimation unit is automatically performed within 30 minutes after the main power supply of the intracardiac defibrillation electrical device is turned on.

[0027] The present invention also provides an intracardiac defibrillation catheter system. The intracardiac defibrillation catheter system according to an embodiment of the present invention is a catheter that is inserted into the heart cavity and has a distal end and a proximal end, and a plurality of electrodes are provided on the distal side thereof; and the above intracardiac defibrillation electrical device that applies a voltage to the plurality of electrodes; It is equipped with.

[0028] The present invention also provides a method for inspecting an intracardiac defibrillation electrical device. The method for inspecting an intracardiac defibrillation electrical device according to an embodiment of the present invention includes: a step of charging a capacitor; a step of discharging to a load resistor R b That is electrically connected to the capacitor and has a resistance value higher than 50Ω; a step of obtaining the voltage of the capacitor after discharging; from the obtained voltage of the capacitor, the capacitor has a resistance value lower than the load resistor R b And a step of calculating the discharge energy that would occur if it were discharged to a predetermined simulation resistor R a That simulates the human heart and has a lower resistance value than. The gist is to perform the steps in order before defibrillation for the patient. In the above method for inspecting an intracardiac defibrillation electrical device, the load resistor R bUsing the value of the voltage of the capacitor after discharging it, the simulated resistor R a Calculate the discharge energy that is estimated to be generated if discharging is performed on it. The load resistor R b is a simulated resistor R that simulates the human heart a Since it has a higher resistance value than, for the load resistor R b even if a predetermined energy is continuously discharged to it a plurality of times, the load resistor R b can be prevented from generating heat, and the risk of damage due to overheating of the load resistor R b can also be reduced. Further, by performing the above steps in order before defibrillation on a patient, omission of inspection can be prevented, and the intracardiac defibrillation electrical device can be used safely.

[0029] In the inspection method of the intracardiac defibrillation electrical device, in a state where the intracardiac defibrillation electrical device, the intracardiac defibrillation catheter, and the electrocardiograph are not electrically connected, it is preferable to perform a step of charging the capacitor, a step of discharging the capacitor, a step of acquiring the voltage of the capacitor, and a step of calculating the discharge energy.

Advantages of the Invention

[0030] In the intracardiac defibrillation electrical device, the intracardiac defibrillation catheter system, and the inspection method of the intracardiac defibrillation electrical device, using the value of the voltage of the capacitor after discharging it, the simulated resistor R b Calculate the discharge energy that is estimated to be generated if discharging is performed on it. The load resistor R a is a simulated resistor R that simulates the human heart b Since it has a higher resistance value than, for the load resistor R a even if a predetermined energy is continuously discharged to it a plurality of times, the load resistor R b can be prevented from generating heat, and the risk of damage due to overheating of the load resistor R b can also be reduced. Further, according to the above inspection method, omission of inspection can be prevented, and the defibrillation electrical device can be used safely. b

Brief Description of the Drawings

[0031]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying Out the Invention

[0032] Hereinafter, the present invention will be described more specifically based on the following embodiments. However, the present invention is not limited by the following embodiments, and it is of course possible to appropriately modify and implement it within the range that can conform to the gist of the foregoing and following descriptions, and all of them are included in the technical scope of the present invention. In each drawing, for convenience, hatching, member numbers, etc. may be omitted, but in such cases, reference shall be made to the specification and other drawings. Also, the dimensions of various members in the drawings may differ from the actual dimensions because priority is given to facilitating the understanding of the features of the present invention.

[0033] One embodiment of the intracardiac defibrillation electrical device of the present invention includes: a capacitor for accumulating charge; a load resistor R having a resistance value higher than 50Ω, which is electrically connected to the capacitor and through which a discharge current from the capacitor flows; a measuring unit electrically connected to the capacitor for acquiring the voltage of the capacitor; and an estimating unit for calculating the discharge energy that would occur if the capacitor with a predetermined charge accumulated discharges against a predetermined simulation resistor R that simulates the human heart and has a lower resistance value than the load resistor R. In the above intracardiac defibrillation electrical device, the discharge energy estimated to occur when discharging against the simulation resistor R is calculated using the value of the voltage of the capacitor after discharging against the load resistor R. The load resistor R b and; a measuring unit electrically connected to the capacitor for acquiring the voltage of the capacitor; and after the capacitor with a predetermined charge accumulated discharges against the load resistor R b using the value of the voltage of the capacitor after discharging, if the capacitor with a predetermined charge accumulated discharges against a predetermined simulation resistor R b that simulates the human heart and has a lower resistance value than the load resistor R a to calculate the discharge energy that would occur. The load resistor R b using the value of the voltage of the capacitor after discharging against it, calculates the discharge energy estimated to occur when discharging against the simulation resistor R a The load resistor Rb is a simulated resistor R that simulates the human heart a has a higher resistance value than, so the load resistor R b even if a predetermined energy is continuously discharged to the load resistor R multiple times b it is possible to suppress the heat generation of, and the risk of damage due to overheating of the load resistor R b can also be reduced.

[0034] In the present invention, the intracardiac defibrillation electrical device is connected to a defibrillation catheter inserted into the heart cavity and applies a voltage to a plurality of electrodes provided on the defibrillation catheter. Hereinafter, the intracardiac defibrillation electrical device may be simply referred to as the "electrical device". In the present invention, the unit of voltage is V, the unit of each resistance is Ω, the unit of the capacitance C of the capacitor is F, the unit of each energy is J, and the unit of time is seconds.

[0035] Hereinafter, the configuration of the electrical device will be described with reference to FIG. 1. FIG. 1 shows a block diagram of the electrical device according to an embodiment of the present invention. The electrical device 1 has a capacitor 2, a measurement unit 3, a load resistor R b , and an estimation unit 5. The capacitor 2 is an element that charges the applied voltage for defibrillation and accumulates electric charge. It can be controlled so that the charging of the capacitor 2 is started by operating the input reception unit 9 described later.

[0036] In FIG. 1, for charging the capacitor 2, a power supply unit 8 is electrically connected to the capacitor 2. As shown in FIG. 1, the capacitor 2 and the power supply unit 8 may be connected via a switch. The power supply unit 8 can include a power supply, a booster circuit that boosts a DC voltage, and a charging circuit. Note that at least a part of these may be provided outside the power supply unit 8. Also, the power supply unit 8 may be provided outside the arithmetic processing control unit 4 as shown in FIG. 1, or may be provided inside the arithmetic processing control unit 4.

[0037] As shown in FIG. 1, it is preferable that the electrical device 1 is provided with an input reception unit 9 that receives input operations such as charging of the capacitor 2 from the user. The input reception unit 9 can include input means such as a button switch, a lever, and a touch panel. In the input reception unit 9, operations such as starting and stopping the electrical device 1, setting the start voltage and applied energy amount applied to the load resistor R b , charging and discharging of the capacitor 2, and selection of the electrode to be applied may be received.

[0038] As shown in FIG. 1, it is preferable that the input reception unit 9 is connected to the arithmetic processing control unit 4. Further, it is preferable that the opening and closing operation of the switch between the power supply unit 8 and the capacitor 2 is controlled by the arithmetic processing control unit 4. Thereby, the input signal from the input reception unit 9 is transmitted to the power supply unit 8 via the arithmetic processing control unit 4. Although not shown, the input reception unit 9 may be connected to the power supply unit 8. Thereby, an electrical signal is transmitted from the input reception unit 9 to the power supply unit 8 according to the operation of the input reception unit 9.

[0039] The measurement unit 3 is electrically connected to the capacitor 2 and acquires the voltage of the capacitor 2. Thereby, the electrical conductivity between the capacitor 2 and the measurement unit 3 is ensured. Preferably, the measurement unit 3 is connected in parallel with the capacitor 2. Examples of the measurement unit 3 include a voltage detection circuit. The voltage detection circuit can include a resistance circuit including a plurality of resistors, an analog-to-digital converter, an amplifier for amplifying an electrical signal, a filter for noise removal, and the like.

[0040] In the measurement unit 3, the residual energy of the capacitor 2 may be calculated using the post-discharge voltage of the capacitor 2 after application to the load resistor R b .

[0041] The load resistor R b is an element provided for applying energy during inspection of the electrical device 1. The load resistor R b is electrically connected to the capacitor 2, a discharge current from the capacitor 2 flows through it, and its resistance value is higher than 50Ω. The load resistor R bAs the resistor, a fixed resistor with a constant resistance value or a variable resistor with a variable resistance value can be used. Also, a chip resistor may be used as the load resistor R b

[0042] The load resistor R b only needs to have a resistance value exceeding 50Ω. For example, it can be 60Ω or more, 80Ω or more, 100Ω or more, or 300Ω or less, 200Ω or less, 150Ω or less. Generally, the resistance value of the human heart is about 50Ω. In the inspection of the defibrillator, it is said that confirmation is made as to whether it can be appropriately applied to a load resistor of 50Ω, which is the same as the resistance value of the human heart. However, when continuously discharging to the load resistor (internal resistance) built in the conventional defibrillator, the load resistor may overheat and be damaged. Therefore, in the present invention, in order to suppress the heat generation of the load resistor, a load resistor R with a resistance value exceeding 50Ω is adopted b

[0043] The estimation unit 5 uses the voltage value of the capacitor 2 after the capacitor 2 in which a predetermined charge is accumulated discharges to the load resistor R b to calculate the discharge energy that would occur if the capacitor 2 in which a predetermined charge is accumulated discharges to a predetermined simulation resistor R b having a lower resistance value than the load resistor R and simulating the human heart. In the electrical device 1, the discharge energy that is estimated to occur if discharging to the simulation resistor R a is calculated using the voltage value of the capacitor 2 after discharging to the load resistor R b Since the load resistor R a has a higher resistance value than the simulation resistor R b simulating the human heart, even if a predetermined energy is continuously discharged to the load resistor R a a plurality of times, it is possible to suppress the heat generation of the load resistor R b and the risk of damage due to overheating of the load resistor R b can also be reduced. Note that the resistance value of the simulation resistor R b is preferably 50Ω. a

[0044] ​​​The calculation of the discharge energy by the estimation unit 5 is preferably automatically performed within 30 minutes after the main power supply of the electrical device 1 is turned on, more preferably automatically performed within 15 minutes, and even more preferably automatically performed within 5 minutes. Thereby, every time the electrical device 1 is used, the discharge energy when applied to the simulation resistor R a is automatically estimated, so that even if the user forgets, the inspection can be carried out without omission. Incidentally, the main power supply of the electrical device 1 may be automatically turned on at a preset time, and the calculation of the discharge energy by the estimation unit 5 may be performed. The set time when the main power supply is turned on can be set, for example, at a time when the electrical device 1 is not used, such as at night.

[0045] Hereinafter, a method for calculating the discharge energy estimated to occur when the capacitor 2 in which a predetermined charge is accumulated discharges to the simulation resistor R a will be described.

[0046] FIG. 2 shows a graph showing a method for calculating the discharge energy E s using the electrical device 1 shown in FIG. 1. The solid line in FIG. 2 shows the voltage waveform of the capacitor 2 when the load resistor R b is 150 Ω, the broken line shows the voltage waveform of the capacitor 2 when the simulation resistor R a is 50 Ω, and the dashed-dotted line shows the voltage waveform of the capacitor 2 when the discharge resistor R c described later is 220 Ω. The first predetermined time T a indicates the time from the start of discharge to the discharge completion time T a to the simulation resistor R a1 to the simulation resistor R b is the time from the start of discharge to the discharge completion time T b to the load resistor R b1 to the load resistor R c is the time from the start of discharge to the load resistor R b to the load resistor R b to the first predetermined time T a only discharges, and then switches to the discharge resistor R c and discharges, indicating the time to the discharge completion time T c1 to. V a is the simulation resistor Ra The time T when the discharge to a1 is completed, and V is the virtual voltage value of capacitor 2 at this time b where R is the load resistance b The time T when the discharge to b1 is completed, and V is the voltage value of capacitor 2 at this time c where R is the load resistance b After discharging to the load resistance R for the first predetermined time T a only, the discharge resistor R is switched, and T is the time when the discharge is completed c The voltage value of capacitor 2 at this time. The measurement unit 3 measures the voltage V0 of capacitor 2 before the start of discharge of capacitor 2 with respect to the load resistance R and the voltage V of capacitor 2 c1 after the first predetermined time T from the start of discharge of capacitor 2. The estimation unit 5 calculates the capacitance C of capacitor 2 according to the following formula (1), and calculates the simulated resistance R b The voltage V of capacitor 2 after the first predetermined time T from the start of discharge of capacitor 2 with respect to a is obtained. The estimation unit 5 calculates the capacitance C of capacitor 2 according to the following formula (1), and calculates the simulated resistance R ab The voltage V of capacitor 2 after the first predetermined time T from the start of discharge of capacitor 2 with respect to a is obtained. The estimation unit 5 calculates the capacitance C of capacitor 2 according to the following formula (1), and calculates the simulated resistance R a The voltage V of capacitor 2 after the first predetermined time T from the start of discharge of capacitor 2 with respect to a is obtained. The estimation unit 5 calculates the capacitance C of capacitor 2 according to the following formula (1), and calculates the simulated resistance R a The voltage V of capacitor 2 after the first predetermined time T from the start of discharge of capacitor 2 with respect to a is obtained. The estimation unit 5 calculates the capacitance C of capacitor 2 according to the following formula (1), and calculates the simulated resistance R s The discharge energy E when capacitor 2 discharges for the first predetermined time T with respect to s is preferably calculated. In FIG. 2, the discharge energy E s is indicated by hatching. In the electrical device 1, the current capacitance C of capacitor 2 calculated by formula (1) is used when calculating the discharge energy E s in formula (3). Therefore, even if the capacitance C decreases due to the aging deterioration of capacitor 2, the actual discharge energy E

[0047]

Equation

[0048]

Equation

[0049]

Number

[0050] However, in the above formulas (1) to (3), r is the loss resistance existing in the electric device 1 other than the load resistance R b and e is the Napier's number.

[0051] Specifically, according to the above formula (3), using the value of the applied energy that may be used by the application of the electric device 1 (for example, 10 J, 20 J, 30 J), V0 that can be arbitrarily set as the performance of the electric device 1, and the capacitance C of the capacitor 2, the voltage V of the capacitor 2 a can be estimated until it reaches what value to discharge. Note that from formula (2), the selected value of the applied energy, the voltage V0 of the capacitor 2 before the start of discharge of the capacitor 2 with respect to the load resistance R b , the calculated V a , the simulated resistance R a and the loss resistance r existing in the electric device 1 are used to calculate the first predetermined time T a . Thereby, an appropriate voltage V0 and V of the capacitor 2 a , the first predetermined time T a and a discharge curve showing the relationship with the value of the applied energy that may be used by the application of the electric device 1 can be obtained. Such a discharge curve is preferably provided in the electric device 1. By the user selecting the value of the energy to be applied according to the state of the patient, defibrillation can be performed according to the discharge curve in which V0, V a , and T a are determined in advance.

[0052] Discharge energy E s In the calculation of, the voltage V0 of the capacitor 2 may be the voltage of the capacitor 2 at the start of discharge of the capacitor 2 with respect to the load resistance R b .

[0053] The discharge energy E may be calculated by a method different from the above method. s For example, the measurement unit 3 measures the voltage V0 of the capacitor 2 before the start of discharge of the capacitor 2 with respect to the load resistance R b and the voltage V a of the capacitor 2 after a first predetermined time T ab from the start of discharge of the capacitor 2, and the estimation unit 5 calculates the capacitance C of the capacitor 2 by the following formula (1) and calculates the discharge energy E s by the following formula (4). In this method, the capacitance C of the capacitor 2 calculated by the formula (1) is used when calculating the discharge energy E s in the formula (4). Therefore, even if the capacitance C decreases due to the aging deterioration of the capacitor 2, the actual discharge energy E s can be calculated. Also, unlike the above method, since V a is not used, the discharge energy E s can be calculated quickly.

[0054]

Number

[0055]

Number

[0056] However, in the above formulas (1) and (4), r is a loss resistance existing in the electric device 1 other than the load resistance R b and e is the Napier's constant.

[0057] The electric device 1 may issue a warning when the discharge energy E s is lower than a predetermined energy. For example, the electric device 1 is connected to the capacitor 2 and the measurement unit 3, and includes a control unit 6 that controls the charging and discharging of the capacitor 2; and is connected to the control unit 6 and receives the load resistance R from the user bAn input receiving unit 9 that receives an input operation for setting a set energy E0 to be applied thereto; and a warning unit 13 that issues a warning to the user; may be further provided. In that case, the control unit 6 determines a reference energy E1 within a predetermined range based on the set energy E0 input by the input receiving unit 9 and compares it with the discharge energy E s ; and the warning unit 13 preferably issues a warning when the discharge energy E s is lower than the reference energy E1. By comparing the reference energy E1 with the discharge energy E s and issuing a warning when the discharge energy E s is lower than the reference energy E1, the user can be prompted to check the state of the capacitor 2 or replace it. As a result, the energy amount required for defibrillation can be ensured. Note that the reference energy E1 is preferably within the larger of ±15% or ±3 J with respect to the set energy E0.

[0058] In the control unit 6, it is preferable to set the application start voltage and application time to the load resistor R b . Also, in the control unit 6, it is preferable to set the application start voltage to the load resistor R b using the set energy E0 input by the input receiving unit 9.

[0059] As the warning unit 13, a display, warning lamp, or speaker provided in the electric device 1 can be used. Also, as the warning unit 13, a display, speaker, earphone, etc. of a personal computer, tablet, smartphone, etc. can also be used. Issuing a warning by the warning unit 13 includes modes in which the warning unit 13 emits sound, light, still images, moving images, etc.

[0060] The warning unit 13 may issue a warning when the remaining energy of the capacitor 2 is greater than a first predetermined value. Thereby, it is possible to confirm whether the discharge is performed at a value smaller than the set energy E0 input by the input receiving unit 9.

[0061] In the warning unit 13, a warning may be issued when the remaining energy of the capacitor 2 is less than a second predetermined value. Thereby, it is possible to confirm whether or not the capacitor 2 has been discharged at or above the set energy E0 input by the input reception unit 9. The second predetermined value can be set to a value smaller than the first predetermined value.

[0062] The comparison between the remaining energy of the capacitor 2 and the first or second predetermined value can be performed by a comparison unit (not shown) preferably provided in the arithmetic processing control unit 4 or the control unit 6. The first predetermined value and the second predetermined value may be set in advance in the comparison unit, stored in a memory (not shown) in the arithmetic processing control unit 4, or supplied to the electric device 1 by a recording medium or the like. The first predetermined value and the second predetermined value may be stored in the same or different memories or comparison units, respectively.

[0063] As shown in FIG. 1, the electric device 1 may have a recording unit 14 that records the discharge energy of the capacitor 2, the voltage applied to the load resistor R b the applied time, the applied energy, the discharge start time, the discharge end time, the voltage of the capacitor 2 before discharge, the voltage after discharge, the electrocardiogram waveform, etc. Thereby, the user can refer to past inspection records and the like.

[0064] As shown in FIG. 1, the electric device 1 may have a display unit 15 that displays the discharge energy of the capacitor 2, the voltage applied to the load resistor R b the applied time, the applied energy, the discharge start time, the discharge end time, the voltage of the capacitor 2 before discharge, the voltage after discharge, the electrocardiogram waveform, etc. As the display unit 15, a display, a warning lamp, or a speaker provided in the electric device 1 can be used. Also, a display of a personal computer, a tablet, a smartphone, or the like can be used as the display unit 15. Note that the display unit 15 may also serve as the warning unit 13.

[0065] Although not shown, the electric device 1 is connected to the control unit 6 and the load resistor R b and is connected to the load resistor R bIt may have an impedance measurement unit that measures the impedance. In that case, it is preferable to set the application time to the load resistor R using the impedance value measured by the impedance measurement unit. This makes it possible to appropriately set the application energy to the load resistor R. b to the load resistor R. b The electric device 1 further includes a power supply unit 8 that is connected to the capacitor 2 and generates an applied voltage, and a discharge resistor R that is connected to the capacitor 2 on the side of the power supply unit 8 with respect to the load resistor R and discharges the residual energy of the capacitor 2 after the application to the load resistor R. It is preferable to have a. Since the residual energy of the capacitor 2 can be discharged to the discharge resistor R, it is possible to prevent energy exceeding the assumption from being applied to the load resistor R.

[0066] The electric device 1 further includes a power supply unit 8 that is connected to the capacitor 2 and generates an applied voltage, and a discharge resistor R that is connected to the capacitor 2 on the side of the power supply unit 8 with respect to the load resistor R and discharges the residual energy of the capacitor 2 after the application to the load resistor R. It is preferable to have a. Since the residual energy of the capacitor 2 can be discharged to the discharge resistor R, it is possible to prevent energy exceeding the assumption from being applied to the load resistor R. b than the power supply unit 8 and is connected to the capacitor 2, and the load resistor R b A discharge resistor R for discharging the residual energy of the capacitor 2 after application to the load resistor R c is preferably provided. Since the residual energy of the capacitor 2 can be discharged to the discharge resistor R, it is possible to prevent energy exceeding the assumption from being applied to the load resistor R. c to the load resistor R b It is possible to prevent energy exceeding the assumption from being applied.

[0067] The electric device 1 preferably has a function of confirming the probability of the estimated discharge energy E. For example, the measurement unit 3 measures the voltage V of the capacitor 2 at a third predetermined time T after the start of discharge of the capacitor 2 with respect to the load resistor R and the discharge resistor R, and the estimation unit 5 uses the following formula (5) to determine the capacitor 2 It is preferable to calculate the discharge energy E when discharging to the load resistor R and the discharge resistor R for a third predetermined time T, and compare the discharge energy E with the discharge energy E. By comparing the discharge energy E with the discharge energy E, it is possible to grasp the probability of the estimated discharge energy E. s For example, the measurement unit 3 measures the voltage V of the capacitor 2 at a third predetermined time T after the start of discharge of the capacitor 2 with respect to the load resistor R b and the discharge resistor R c After that, the voltage V of the capacitor 2 c is measured, and the estimation unit 5 uses the following formula (5) to determine the capacitor 2 with respect to the load resistor R c and the discharge resistor R b and the discharge resistor R c For a third predetermined time T c When the capacitor 2 discharges, the discharge energy E r is calculated, and the discharge energy E s and the discharge energy E r are preferably compared. By comparing the discharge energy E s with the discharge energy E r It is possible to grasp the probability of the estimated discharge energy E s by comparing the discharge energy E with the discharge energy E.

[0068]

Equation

[0069] As another method, the measurement unit 3 measures the load resistance R b and the discharge resistance R c of the capacitor 2 at a third predetermined time T c after the start of discharge of the capacitor 2 with respect to the capacitor 2, and the estimation unit 5 calculates the discharge energy E c when the capacitor 2 discharges with respect to the load resistance R b and the discharge resistance R c for a third predetermined time T c by the following formula (6), and it is preferable to compare the discharge energy E r with the discharge energy E s . By comparing the discharge energy E r with the discharge energy E s , the reliability of the estimated discharge energy E r can be grasped. s

[0070]

Equation

[0071] In the electrical device 1, it is preferable that the resistance value of the discharge resistance R c is equal to or higher than the resistance value of the simulated resistance R a . Since the resistance value of the load resistance R b is higher than the resistance value of the simulated resistance R a and the resistance value of the discharge resistance R c is equal to or higher than the resistance value of the simulated resistance R a , the capacitor 2 continues to discharge to a resistor having a resistance value higher than that of the simulated resistance R a at all times from the start to the completion of the discharge of the capacitor 2. Therefore, the discharge time can be made longer compared to the case where the discharge is performed only with respect to the simulated resistance R a , and the heat generation amount of the resistor per unit time can be suppressed.

[0072] The discharge resistance R cThe resistance value is preferably 100 Ω or more, more preferably 200 Ω or more, and even more preferably 300 Ω or more. Also, for the discharge resistor R c the resistance value is preferably 1000 Ω or less, more preferably 800 Ω or less, and even more preferably 600 Ω or less. Thereby, the time required for the completion of the discharge to the discharge resistor R c can be set to an appropriate length.

[0073] The load resistor R b is preferably equal to the resistance value of the discharge resistor R c . Thereby, the above formula (5) becomes the following formula (5)-1, and the above formula (6) becomes the following formula (6)-1. Therefore, the calculation of the discharge energy E r becomes easier.

[0074]

Equation

[0075]

Equation

[0076] The load resistor R b when the resistance value is equal to the resistance value of the discharge resistor R c , the discharge curve with respect to the discharge resistor R c (the dashed line in FIG. 2) coincides with the discharge curve with respect to the load resistor R b (the solid line in FIG. 2), and V c = V b and T c = T b . In this case, the time T b required for the discharge is proportional to the magnitude of the resistance value with respect to T a , and ideally T b = T a ·R b / R a .

[0077] In the electrical device 1, the resistance value of the load resistor R b is the resistance value of the discharge resistor Rc It may be different from the resistance value. After the first predetermined time T a subsequently, it will be applied to the discharge resistor R c , and the discharge completion time will change from T b1 to T c1 . The time from when the capacitor voltage reaches V b to V c , that is, the time from when the discharge target is the load resistor R b to when it switches to the discharge resistor R c until the application ends is proportional to the magnitude of the resistance value with respect to the discharge time required in the case of the load resistor R b (T b -T a ). Specifically, (T b -T a )×R c / R b =T a ×(R b -R a )R c / R a R b . The time from V0 to V ab (discharge to the load resistor R b ) is T a , so the time T b from V0 to V c is ideally T c =T a ×{R a R b +(R b -R a )R c} / R a R b .

[0078] The electrical device 1 in FIG. 1 has a waveform generation unit 10. In the waveform generation unit 10, an energization waveform is generated. The energization waveform may be biphasic with a polarity inversion in the middle, or may be monophasic with a constant polarity. However, the biphasic waveform is preferred because it can stimulate with less energy. The energization energy applied to the living body can be set, for example, to be 1 J or more and 30 J or less.

[0079] The electrical device 1 in FIG. 1 has an electrocardiogram waveform input unit 12. In that case, it is preferable that the information on the electrocardiogram waveform output from the electrocardiograph 35 is input into the electrocardiogram waveform input unit 12 from the outside through a conducting wire or the like. When the electrocardiogram waveform input unit 12 is connected to the body surface electrode 24 described later, it is preferable that the electrocardiogram waveform input unit 12 can withstand a 5 kV discharge input through a 50 Ω resistor. When the electrocardiogram waveform input from the electrocardiogram waveform input unit 12 satisfies a predetermined condition, a permission signal generation unit (not shown), preferably provided in the arithmetic processing control unit 4, can be controlled to generate a permission signal for turning on various switches in the electrical device 1. By turning on the switch, it is possible to energize the electrodes of the catheter described later.

[0080] The electrocardiogram waveform is preferably a waveform obtained by the second lead that is easy to detect an event estimated as the R wave. However, the electrocardiogram waveform is not limited to the second lead and may be obtained by other leads depending on the orientation of the patient's heart. For example, when obtaining an electrocardiogram waveform by 12 leads, the electrocardiogram waveform may be a waveform obtained by V1 lead, V2 lead, V3 lead, V4 lead, V5 lead, V6 lead, first lead, second lead, third lead, aVR lead, aVL lead, or aVF lead. Also, the electrocardiogram waveform may be an average waveform of two or more leads, an average waveform of three or more leads, or an average waveform of 12 leads.

[0081] At least any one of the functions provided in the electrical device 1, for example, the functions of the measurement unit 3, the arithmetic processing control unit 4, the estimation unit 5, the control unit 6, the power supply unit 8, the waveform generation unit 10, the electrocardiogram waveform input unit 12, the permission signal generation unit, the memory, etc. may be realized by hardware or may be realized by software. As the hardware, it includes logic circuits formed in integrated circuits such as LSI (Large Scale Integration), ASIC (Application Specific Integrated Circuit), and FPGA (Field-Programmable Gate Array).

[0082] The electrical device 1 may include a computer that executes program instructions of software for realizing at least any one of the functions of the measurement unit 3, the arithmetic processing control unit 4, the estimation unit 5, the control unit 6, the power supply unit 8, the waveform generation unit 10, the electrocardiogram waveform input unit 12, the permission signal generation unit, and the memory. The computer preferably includes a processor and a computer-readable recording medium storing the above program. By the processor executing the program stored in the computer-readable recording medium, the above functions are realized. As the processor, a CPU (Central Processing Unit) can be used. As the recording medium, a ROM (Read Only Memory) or the like can be used. Also, the recording medium can include a RAM (Random Access Memory). The above program may be supplied to the above computer via any transmission medium capable of transmitting this program. Examples of the transmission medium include a communication network and a communication line.

[0083] The present invention also provides an intracardiac defibrillation catheter system. FIG. 3 shows a schematic diagram of an intracardiac defibrillation catheter system according to an embodiment of the present invention. As shown in FIG. 3, the intracardiac defibrillation catheter system 40 includes a catheter 20 that is inserted into the heart cavity and has a distal end and a proximal end, and a plurality of electrodes are provided on the distal side thereof; and the electrical device 1 that applies a voltage to the plurality of electrodes. Hereinafter, the intracardiac defibrillation catheter system 40 may be simply referred to as the system 40.

[0084] The proximal side of the catheter 20 refers to the side closer to the operator's hand with respect to the extending direction of the catheter 20, and the distal side refers to the opposite direction to the proximal side (i.e., the direction of the treatment target side). Also, the proximal portion of the catheter 20 refers to the half on the operator's hand side with respect to the extending direction of the catheter 20, and the distal portion of the catheter 20 refers to the portion other than the proximal portion (i.e., the half on the treatment target side of the catheter 20).

[0085] In FIG. 3, the catheter 20 and the electrical device 1 are connected by a first conductor 31, and the electrical device 1 and the electrocardiograph 35 are connected by a second conductor 32. Thus, intracardiac potential information transmitted from the catheter 20 is input to the electrocardiograph 35 through the electrical device 1 via the second conductor 32 and the like. Also, electrocardiogram information obtained from a body surface electrode 24, which will be described later, is transmitted to the electrocardiograph 35, and information on the electrocardiogram waveform output from the electrocardiograph 35 is preferably input into the interior of the electrical device 1 from the electrocardiogram waveform input unit 12 via the third conductor 33 and the like.

[0086] Examples of the catheter 20 include a resin tube formed in a cylindrical shape. As shown in FIG. 3, the catheter 20 preferably has a first electrode group having a plurality of first electrodes 21 and a second electrode group arranged more proximally than the first electrode group and having a plurality of second electrodes 22. It is more preferable that the first electrode group is arranged at a position corresponding to the coronary sinus and the second electrode group is arranged at a position corresponding to the right atrium. Also, the catheter 20 may have a third electrode group arranged more proximally than the second electrode group and having a plurality of third electrodes 23 for measuring intracardiac potential. The third electrode group can be arranged, for example, at a position corresponding to the ascending aorta. It is preferable that the third electrode group is not connected to the power supply unit 8. This makes it easier to use the third electrode group as a dedicated electrode for measuring intracardiac potential.

[0087] Each electrode group preferably exists in a region covering more than half of the outer periphery of the resin tube, and is more preferably formed in a ring shape. By forming the electrodes in this way, the contact area with the heart increases, making it easier to measure intracardiac potential and apply electrical stimulation. Each electrode group may contain a conductive material such as platinum or stainless steel, but preferably contains an X-ray impermeable material such as platinum in order to easily grasp the position of the electrode under fluoroscopy.

[0088] The electrical device 1 shown in FIG. 1 is provided with a patient connection part 11 having a first connection part connected to a plurality of electrodes provided on the catheter 20 and a second connection part connected to the electrocardiograph 35. Although not shown, the electrical device 1 may have a switching part that is connected to the power supply part 8 and switches between a first mode of measuring the intracardiac potential and a second mode of applying a voltage while measuring the intracardiac potential. Preferably, the first connection part is connected to the power supply part 8 via the switching part, and the first connection part is connected to the second connection part without passing through the switching part. Since the first connection part is connected to the second connection part without passing through the switching part, the local potential at each electrode can be measured even during defibrillation.

[0089] The system 40 may have body surface electrodes 24 arranged on the body surface of the human body. Thereby, electrocardiographic information can be acquired and transmitted to the electrocardiograph 35. The electrodes for acquiring electrocardiographic information are not limited to the body surface electrodes 24 and may be electrodes for measuring intracardiac potential, but the body surface electrodes 24 are preferable because of their excellent detection sensitivity for the R wave. As the body surface electrodes 24, 12-lead electrodes are preferable.

[0090] A tip chip 25 may be provided at the distal end of the catheter 20. The tip chip 25 may have a tapered part whose outer diameter becomes smaller toward the distal side. In order for the tip chip 25 to function as an electrode, the tip chip 25 may be made of a conductive material. Note that the tip chip 25 may be made of a polymer material, and the hardness of the tip chip 25 may be made lower than the hardness of the resin tube in order to protect the body tissue.

[0091] As shown in FIG. 3, it is preferable that an operation part 26 for the user to grip is provided on the proximal side of the catheter 20.

[0092] The system 40 may include an electrocardiograph 35. The electrocardiograph 35 measures the intracardiac potential through various electrodes. A known electrocardiograph 35 can be used.

[0093] The present invention also provides a method for inspecting an intracardiac defibrillation electrical device 1. The inspection method of the intracardiac defibrillation electrical device 1 according to an embodiment of the present invention includes: a step of charging a capacitor 2; a load resistor R that is electrically connected to the capacitor 2 and has a resistance value higher than 50 Ω b a step of discharging to; a step of obtaining the voltage of the capacitor 2 after discharging; from the obtained voltage of the capacitor 2, if the capacitor 2 discharges to a predetermined simulation resistor R that simulates the human heart and has a lower resistance value than the load resistor R b a step of calculating the discharge energy that would occur; and the gist lies in performing these steps in order before defibrillation for the patient. In the inspection method of the intracardiac defibrillation electrical device 1 described above, the voltage value of the capacitor 2 after discharging to the load resistor R is used to calculate the discharge energy that is estimated to occur if discharging to the simulation resistor R a Since the load resistor R has a higher resistance value than the simulation resistor R that simulates the human heart, even if a predetermined energy is continuously discharged to the load resistor R multiple times, heat generation of the load resistor R b can be suppressed, and the risk of damage due to overheating of the load resistor R a can also be reduced. Further, by performing the above steps in order before defibrillation for the patient, inspection omission can be prevented, and the intracardiac defibrillation electrical device 1 can be used safely. b In the inspection method of the intracardiac defibrillation electrical device 1 described above, it is preferable to perform the step of charging the capacitor 2, the step of discharging the capacitor 2, the step of obtaining the voltage of the capacitor 2, and the step of calculating the discharge energy in a state where the intracardiac defibrillation electrical device 1, the intracardiac defibrillation catheter, and the electrocardiograph are not electrically connected. Since the steps of charging and discharging the capacitor 2 are included in a state where the intracardiac defibrillation electrical device 1, the intracardiac defibrillation catheter, and the electrocardiograph are not electrically connected, it is possible to suppress accidental application to the human body during inspection. a Since the load resistor R has a higher resistance value than the simulation resistor R that simulates the human heart, even if a predetermined energy is continuously discharged to the load resistor R multiple times, heat generation of the load resistor R b can be suppressed, and the risk of damage due to overheating of the load resistor R b can also be reduced. Further, by performing the above steps in order before defibrillation for the patient, inspection omission can be prevented, and the intracardiac defibrillation electrical device 1 can be used safely. b In the inspection method of the intracardiac defibrillation electrical device 1 described above, it is preferable to perform the step of charging the capacitor 2, the step of discharging the capacitor 2, the step of obtaining the voltage of the capacitor 2, and the step of calculating the discharge energy in a state where the intracardiac defibrillation electrical device 1, the intracardiac defibrillation catheter, and the electrocardiograph are not electrically connected. Since the steps of charging and discharging the capacitor 2 are included in a state where the intracardiac defibrillation electrical device 1, the intracardiac defibrillation catheter, and the electrocardiograph are not electrically connected, it is possible to suppress accidental application to the human body during inspection.

[0094] In the inspection method of the intracardiac defibrillation electrical device 1 described above, it is preferable to perform the step of charging the capacitor 2, the step of discharging the capacitor 2, the step of obtaining the voltage of the capacitor 2, and the step of calculating the discharge energy in a state where the intracardiac defibrillation electrical device 1, the intracardiac defibrillation catheter, and the electrocardiograph are not electrically connected. Since the steps of charging and discharging the capacitor 2 are included in a state where the intracardiac defibrillation electrical device 1, the intracardiac defibrillation catheter, and the electrocardiograph are not electrically connected, it is possible to suppress accidental application to the human body during inspection.

[0095] Note that, in a state where the intracardiac defibrillation electrical device 1 and the electrocardiograph are electrically connected, and the intracardiac defibrillation electrical device 1 and the intracardiac defibrillation catheter are not electrically connected, a step of charging the capacitor 2, a step of discharging the capacitor 2, a step of acquiring the voltage of the capacitor 2, and a step of calculating the discharge energy may be performed. Since at least the intracardiac defibrillation electrical device 1 and the defibrillation catheter are not electrically connected, it is possible to suppress accidental application to the human body during inspection.

[0096] This application claims the benefit of priority based on Japanese Patent Application No. 2020-99536 filed on June 8, 2020. The entire contents of the specification of Japanese Patent Application No. 2020-99536 filed on June 8, 2020 are incorporated herein by reference.

Explanation of Signs

[0097] 1: Intracardiac defibrillation electrical device (electrical device) 2: Capacitor 3: Measurement unit 4: Arithmetic processing control unit 5: Estimation unit 6: Control unit 8: Power supply unit 9: Input reception unit 10: Waveform generation unit 11: Patient connection unit 12: Electrocardiogram waveform input unit 13: Warning unit 14: Recording unit 15: Display unit 20: Catheter 21: First electrode 22: Second electrode 23: Third electrode 24: Body surface electrode 25: Tip 26: Operation unit 31: First conductor 32: Second conductor 33: Third conductor 35: Electrocardiograph 40: Intracardiac defibrillation catheter system C: Capacitance E0: Set Energy E1: Reference Energy E r : Discharge energy when the capacitor discharges to the load resistor and the discharge resistor for a third predetermined time E s : Discharge energy when the capacitor discharges to the simulated resistor for a first predetermined time R a : Simulated resistor R b : Load resistor R c : Discharge resistor r: Loss resistor T a : First predetermined time T a1 : Time when discharge to the simulated resistor is completed T b : Second predetermined time T b1 : Time when discharge to the load resistor is completed T c : Third predetermined time T c1 : Time when discharge to the discharge resistor is completed V0: Voltage of the capacitor before discharge to the load resistor starts V a : Virtual voltage of the capacitor at the time when discharge to the simulated resistor is completed V b : Voltage of the capacitor at the time when discharge to the load resistor is completed V c : Voltage of the capacitor at the time when discharge to the discharge resistor is completed V ab : Voltage of the capacitor at a time after the first predetermined time from the start of discharge of the capacitor

Claims

1. a capacitor for accumulating electric charge, A load resistor R that is electrically connected to the capacitor, through which a discharge current from the capacitor flows, and has a resistance value higher than 50 Ω ｂ and electrically connected to the capacitor, the load resistor R ｂ the voltage V of the capacitor before the start of discharge of the capacitor with respect to ０ and, from the start of discharge of the capacitor to the first predetermined time T ａ the voltage V of the capacitor after ａｂ and a measurement unit that acquires The voltage V of the capacitor ０ , V ａｂ、 and the value of the first predetermined time T ａ are used to calculate the discharge energy Es that would occur if a capacitor storing a predetermined charge discharges with respect to a predetermined simulated resistance R ｂ whose resistance value is lower than that of the load resistor R ｂ and that simulates the human heart, and an estimation unit for calculating the discharge energy Es that would occur if a capacitor storing a predetermined charge discharges with respect to a predetermined simulated resistance R ａ whose resistance value is lower than that of the load resistor R ｂ and that simulates the human heart. An intracardiac defibrillation electrical device having an estimation unit for calculating the discharge energy Es that would occur if a capacitor storing a predetermined charge discharges with respect to a predetermined simulated resistance R ａ whose resistance value is lower than that of the load resistor R ｂ and that simulates the human heart.​​​​

2. The estimation unit calculates the capacitance C of the capacitor according to the following formula (1), and calculates the voltage V of the capacitor after the following first predetermined time T from the start of discharge of the capacitor with respect to the following simulated resistor R according to the following formula (2). ａ from the start of discharge of the capacitor with respect to the simulated resistor R to the first predetermined time T ａ afterwards. ａ and calculates According to the following formula (3), when the capacitor discharges with respect to the analog resistor R ａ for the first predetermined time T ａ the discharge energy E ｓ The intracardiac defibrillation electrical device according to claim 1, which calculates 【Number 1】 【Number 2】 【Number 3】 However, in the above formulas (1) to (3), r is the loss resistance existing in the intracardiac defibrillation electrical device other than the load resistance R ｂ and e is the Napier's constant.

3. The estimating unit calculates the capacitance C of the capacitor according to the following formula (1), and calculates the discharge energy E according to the following formula (4). ｓ The intracardiac defibrillation electrical device according to claim 1, which calculates [Number 4] 【Number 5】 However, in the above formulas (1) and (4), r is a loss resistance existing in the intracardiac defibrillation electrical device other than the load resistance R ｂ and e is the Napier's constant.

4. a control unit connected to the capacitor and the measurement unit for controlling charging and discharging of the capacitor, is connected to the control unit and receives an input operation for setting the set energy E ｂ to be applied to the load resistor R ０ from the user. a warning unit for giving a warning to the user, and further comprising, The control unit compares a reference energy E within a predetermined range determined based on the set energy E input by the input reception unit ０ with the discharge energy E １ and the discharge energy E ｓ is what is compared The warning unit issues a warning when the discharge energy E １ is lower than the reference energy E ｓ The intracardiac defibrillation electrical device according to claim 2 or 3, which is configured to issue a warning when the discharge energy E is lower than the reference energy E.

5. a power supply unit connected to the capacitor for generating an applied voltage, the load resistor R ｂ is connected to the capacitor on the power supply unit side rather than the load resistor R ｂ and has a discharge resistor R that discharges the residual energy of the capacitor after application to the load resistor R ｃ The intracardiac defibrillation electrical device according to any one of claims 2 to 4, further comprising

6. The measurement unit measures the load resistance R ｂ and the discharge resistance R ｃ and measures the voltage V ｃ of the capacitor after a third predetermined time T ｃ from the start of discharge of the capacitor, The estimating unit calculates the discharge energy E when the capacitor discharges with respect to the load resistor R ｂ and the discharge resistor R ｃ for the third predetermined time T ｃ , and compares the discharge energy E ｒ with the discharge energy E ｓ . The intracardiac defibrillation electrical device according to claim 5, which compares the discharge energy E ｒ with the discharge energy E 【Number 6】

7. The measurement unit measures the load resistor R ｂ and the discharge resistor R ｃ and measures the voltage V ｃ of the capacitor after a third predetermined time T ｃ has elapsed since the start of discharge of the capacitor, The estimation unit calculates the discharge energy E of the capacitor with respect to the load resistor R and the discharge resistor R when discharging for the third predetermined time T according to the following formula (6). ｂ and the discharge resistor R ｃ for the third predetermined time T ｃ when discharging, and ｒ calculates it. the discharge energy E ｓ and the discharge energy E ｒ The intracardiac defibrillation electrical device according to claim 5, which compares the two. 【Number 7】

8. the discharge resistor R ｃ has a resistance value equal to or greater than that of the simulation resistor R ａ The intracardiac defibrillation electrical device according to any one of claims 5 to 7

9. the load resistor R ｂ has a resistance value equal to that of the discharge resistor R ｃ The intracardiac defibrillation electrical device according to any one of claims 5 to 8.

10. The intracardiac defibrillation electrical device according to any one of claims 1 to 9, wherein the calculation of the discharge energy Es is automatically performed within 30 minutes after the main power supply of the intracardiac defibrillation electrical device is turned on.

11. a catheter inserted into the heart cavity and having a distal end and a proximal end, and a plurality of electrodes are provided on the distal side thereof, an intracardiac defibrillation catheter system comprising the intracardiac defibrillation electrical device according to any one of claims 1 to 10 for applying a voltage to the plurality of electrodes.

12. a step of charging the capacitor, A step of discharging to a load resistor R that is electrically connected to the capacitor and has a resistance value higher than 50 Ω ｂ and a step of discharging to the load resistor R the load resistor R ｂ the voltage V of the capacitor before the start of discharge of the capacitor with respect to ０ and, from the start of discharge of the capacitor to the first predetermined time T ａ the voltage V of the capacitor after ａｂ obtaining steps The voltage V of the obtained capacitor ０ , V ａｂ、 and the first predetermined time T ａ From, the capacitor is the load resistor R ｂ A step of calculating the discharge energy generated if the capacitor discharges with respect to a predetermined simulation resistor R having a resistance value lower than that of the capacitor and simulating the human heart ａ A method for inspecting an intracardiac defibrillation electrical device, which sequentially performs the steps of calculating the discharge energy generated when discharging with respect to a predetermined simulation resistor R having a resistance value lower than that of the capacitor and simulating the human heart, before defibrillation for a patient

13. The step of charging the capacitor, the step of discharging the capacitor, the voltage V of the capacitor, in a state where the intracardiac defibrillation electrical device, the intracardiac defibrillation catheter, and the electrocardiograph are not electrically connected. ０ , V ａｂ The method for inspecting an intracardiac defibrillation electrical device according to claim 12, which performs a step of obtaining and a step of calculating the discharge energy.

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