CN115697473A - Intracardiac defibrillation electrical device, intracardiac defibrillation catheter system, and method for inspecting intracardiac defibrillation electrical device - Google Patents
Intracardiac defibrillation electrical device, intracardiac defibrillation catheter system, and method for inspecting intracardiac defibrillation electrical device Download PDFInfo
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- CN115697473A CN115697473A CN202180040521.8A CN202180040521A CN115697473A CN 115697473 A CN115697473 A CN 115697473A CN 202180040521 A CN202180040521 A CN 202180040521A CN 115697473 A CN115697473 A CN 115697473A
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- A61N1/00—Electrotherapy; Circuits therefor
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Abstract
The present invention provides an electrical apparatus (1) for defibrillation in a heart chamber, comprising: a capacitor (2) that accumulates charge; load resistance R b And a load resistor R electrically connected to the capacitor 2 and through which a discharge current flows from the capacitor 2 b Is higher than 50 Ω; a measuring unit (3) which is electrically connected to the capacitor (2) and acquires the voltage of the capacitor (2); and an estimation unit (5) that uses a capacitor (2) that stores a predetermined charge with respect to a load resistance R b The value of the voltage of the capacitor (2) after discharge is calculated as the discharge energy of the capacitor (2) storing a predetermined charge relative to a predetermined analog resistance R a Generated during discharge, the predetermined analog resistance R a Is configured to have a resistance value lower than that of the load resistor R b And simulates the heart of a human body.
Description
Technical Field
The present invention relates to an electrical device used for defibrillation in a heart chamber, an intracardiac defibrillation catheter system including the electrical device, and a method for checking whether there is a problem with the operation of the electrical device before defibrillation is performed on a living body.
Background
In the treatment of arrhythmia such as atrial fibrillation or ventricular fibrillation, defibrillation is performed to restore the heart rhythm to normal by applying electrical stimulation. As a device for performing defibrillation, in addition to an external defibrillator, an intracardiac defibrillator is also available, which can utilize a voltage waveform of lower energy than an external defibrillator and reduce the burden on a patient. When using a defibrillator, the following checks are performed: for confirming whether or not the operation is normal, for example, whether or not energy can be appropriately applied to a load resistance of 50 Ω simulating a human body.
Patent document 1 discloses a defibrillator provided with an automatic self-test system. The defibrillator has a high voltage delivery system including a capacitor that monitors the voltage and current as the capacitor discharges.
Patent document 2 discloses that whether or not a power supply device is operating normally or whether or not a predetermined energy can be applied when a defibrillation catheter is connected to an internal resistor is confirmed by setting an intracardiac defibrillation catheter system to a test mode.
Patent document 3 discloses that an electric pulse is applied to an internal resistor at the time of maintenance of an electrostimulator defibrillator, and the applied energy is calculated from the terminal voltage of a capacitor before and after application and displayed.
Patent document 1: japanese Kohyo publication Hei 9-500798
Patent document 2: japanese patent application laid-open No. 2010-220778
Patent document 3: japanese patent laid-open publication No. 2004-181111
According to the defibrillator of patent document 1, it is possible to confirm whether or not the overcurrent detection function and the overvoltage detection function are operating properly, but it is not intended to confirm whether or not the energy applied to the load resistor is proper. In addition, patent document 2 does not disclose a specific method for confirming whether or not the intracardiac defibrillation catheter system can apply a predetermined energy. In the examination of the defibrillator, there are cases where the load resistance is discharged a prescribed energy multiple times in succession. However, when the internal resistance simulating the heart of the human body of the defibrillator of patent document 3 is continuously discharged, the internal resistance may overheat and be damaged. Accordingly, an object of the present invention is to provide an electrical device for defibrillation in the cardiac chamber, a catheter system for defibrillation in the cardiac chamber, and a method of inspecting an electrical device for defibrillation in the cardiac chamber, which can calculate discharge energy applied to a living body at the time of defibrillation while suppressing heat generation of a load resistor.
Disclosure of Invention
An embodiment of an electrical apparatus for defibrillation inside the cardiac chamber according to the present invention that can achieve the above object is an electrical apparatus for defibrillation inside the cardiac chamber including: a capacitor that accumulates charge; load resistance R b The load resistance R b Is electrically connected with the capacitor for flowing discharge current from the capacitor, and the load resistor R b Is higher than 50 Ω; a measuring part electrically connected to the capacitor to obtain a voltage of the capacitor; and an estimation unit for estimating a load resistance R using a capacitor in which a predetermined charge is accumulated b The value of the voltage of the capacitor after discharge is calculated as the discharge energy of the capacitor having accumulated a predetermined charge with respect to a predetermined analog resistance R a Generated during discharge, the predetermined analog resistance R a Is configured to have a resistance value lower than that of the load resistor R b And simulates the heart of a human body. In the electrical apparatus for defibrillation in the cardiac chamber, a load resistance R is used b The value of the voltage of the capacitor after discharge is calculated and estimated to be in relation to the analog resistance R a Discharge energy generated when discharging is performed. Load resistance R b Having an analogue resistance R higher than that of the heart simulating the human body a So that even for the load resistance R b The load resistance R can be suppressed by discharging the predetermined energy continuously for a plurality of times b OfHeat, can also lower the load resistance R b Risk of breakage due to overheating.
In the above-described electrical apparatus for defibrillation in the cardiac chamber, it is preferable that the measurement unit acquires the capacitance with respect to the load resistance R b Voltage V of the capacitor before the start of discharge 0 And 1 st predetermined time T from the start of discharge of the capacitor a Voltage V of the latter capacitor ab The estimating unit calculates the capacitance C of the capacitor from the following formula (1), and calculates the capacitance C of the capacitor with respect to the simulated resistance R from the capacitor from the following formula (2) a 1 st predetermined time T a Voltage V of the capacitor a The capacitor versus the analog resistance R is calculated from the following formula (3) a Is discharged for a 1 st predetermined time T a Discharge energy of time E s 。
[ equation 1 ]
[ equation 2 ]
[ equation 3 ]
Wherein, in the above formulas (1) to (3), R is the load resistance R b And e is the nanophase constant, in addition to the loss resistance present in the electrical device for defibrillation in the cardiac chamber.
In the above-described electrical apparatus for defibrillation in the cardiac chamber, it is preferable that the measurement unit acquires the capacitance with respect to the load resistance R b Voltage V of the capacitor before the start of discharge 0 And 1 st predetermined time T from the start of discharge of the capacitor a Voltage V of the capacitor ab The estimating unit calculates the capacitance C of the capacitor based on the following formula (1)Equation (4) calculation of discharge energy E s 。
[ equation 4 ]
[ equation 5 ]
Wherein, in the above formula (1) and formula (4), R is a load resistance R b And e is the nanopiere constant, in addition to the loss resistance present in the electrical apparatus for defibrillation in the cardiac chamber.
Preferably, the intracardiac defibrillation electrical apparatus further includes: a control unit connected to the capacitor and the measurement unit, for controlling charging and discharging of the capacitor; an input receiving unit connected to the control unit for receiving a load resistance R applied from a user b Set energy E of 0 Performing a set input operation; and a warning unit for giving a warning to the user, wherein the control unit controls the reference energy E within a predetermined range 1 And discharge energy E s Comparing the reference energy E in the predetermined range 1 Based on the setting energy E inputted by the input receiving part 0 Then, the warning part determines the discharge energy E s Lower than reference energy E 1 A warning is issued.
Preferably, the intracardiac defibrillation electrical apparatus further includes: a power supply unit connected to the capacitor and generating an applied voltage; and a discharge resistor R c The discharge resistance R c At a specific load resistance R b The capacitor is connected to the power source side, and is applied to the load resistor R b The remaining energy of the latter capacitor is discharged.
In the above-described electrical apparatus for intracardiac defibrillation, it is preferable that the measurement unit measures the measured value of the slave capacitor with respect to the load resistance R b And a discharge resistor R c The discharge of (2) is started to pass through the 3 rd predetermined time T c Voltage V of the capacitor c The estimating unit calculates a load resistance R of the capacitor based on the following expression (5) b And a discharge resistor R c Is discharged for a 3 rd predetermined time T c Discharge energy of time E r To discharge energy E s And discharge energy E r A comparison is made.
[ number 6 ]
In the above-described electrical apparatus for intracardiac defibrillation, it is preferable that the measurement unit measures the measured value of the slave capacitor with respect to the load resistance R b And a discharge resistor R c Is started to pass through the 3 rd predetermined time T c Voltage V of the latter capacitor c The estimating unit calculates a load resistance R of the capacitor based on the following formula (6) b And a discharge resistor R c Is discharged for a 3 rd predetermined time T c Discharge energy of time E r To discharge energy E s And discharge energy E r A comparison is made.
[ equation 7 ]
In the above-described electrical device for intracardiac defibrillation, the discharge resistor R is preferably c The resistance value of (A) is an analog resistance R a Is not less than the resistance value of (1).
In the above-described electrical apparatus for intracardiac defibrillation, the load resistor R is preferably selected b Resistance value and discharge resistance R c The resistance values of (a) are equal.
In the above-described electrical apparatus for intracardiac defibrillation, the estimation unit preferably calculates the discharge energy automatically within 30 minutes after the main power supply of the electrical apparatus for intracardiac defibrillation is turned on.
The present invention also provides an intracardiac defibrillation catheter system. An intracardiac defibrillation catheter system according to an embodiment of the present invention includes: a catheter inserted into the heart chamber, having a distal end and a proximal end, a plurality of electrodes being provided on a distal side of the catheter; and the electrical apparatus for defibrillation in the cardiac chamber applies a voltage to the plurality of electrodes.
The invention also provides a method of inspecting an electrical device for defibrillation within a heart chamber. In the method for inspecting an electrical apparatus for defibrillation inside a heart chamber according to an embodiment of the present invention, the following steps are sequentially performed before defibrillation to a patient: charging the capacitor; with respect to a load resistance R electrically connected to the capacitor and having a resistance value higher than 50 omega b Discharging; obtaining the voltage of the discharged capacitor; and calculating a discharge energy of the capacitor with respect to a predetermined analog resistance R based on the obtained voltage of the capacitor a Generated during discharge, the predetermined analog resistance R a Is configured to have a resistance value lower than that of the load resistor R b And simulates the heart of a human body. In the method for inspecting the electrical apparatus for defibrillation in the cardiac chamber, the resistance R to the load is used b The value of the voltage of the capacitor after discharge is calculated and estimated to be in relation to the analog resistance R a Discharge energy generated when discharging is performed. Load resistance R b Having an analogue resistance R higher than that of the heart simulating the human body a So that even for the load resistance R b The load resistance R can be suppressed by discharging the predetermined energy continuously for a plurality of times b Can also reduce the load resistance R b Risk of breakage due to overheating. Further, by performing the above steps in sequence before defibrillation to a patient, omission of examination can be prevented, and the electrical apparatus for defibrillation inside the heart chamber can be used safely.
In the above-described method for inspecting an electrical apparatus for intracardiac defibrillation, it is preferable that the step of charging the capacitor, the step of discharging the capacitor, the step of acquiring the voltage of the capacitor, and the step of calculating the discharge energy are performed in a state where the electrical apparatus for intracardiac defibrillation, the intracardiac defibrillation catheter, and the electrocardiograph are not electrically connected.
The electrical apparatus for defibrillation in the cardiac chamber, the defibrillation catheter system in the cardiac chamber, and the defibrillator in the cardiac chamberIn the method for inspecting the chattering electric device, a resistance R to a load is used b The value of the voltage of the capacitor after discharge is calculated and estimated to be in relation to the analog resistance R a Discharge energy generated when discharging is performed. Load resistance R b Having an analogue resistance R higher than that of the heart simulating the human body a So that even for the load resistance R b The load resistance R can be suppressed by discharging the predetermined energy continuously for a plurality of times b Can also reduce the load resistance R b Risk of breakage due to overheating. In addition, according to the above-described inspection method, inspection omission can be prevented, and the electrical apparatus for defibrillation can be safely used.
Drawings
Fig. 1 shows a block diagram of an electrical defibrillation apparatus according to an embodiment of the present invention.
FIG. 2 shows a graph illustrating the discharge energy E of the defibrillation apparatus used in FIG. 1 s A chart of the calculation method of (1).
Figure 3 illustrates a schematic diagram of an intracardiac defibrillation catheter system in accordance with one embodiment of the present invention.
Detailed Description
The present invention will be described more specifically below based on the following embodiments, but the present invention is not limited to the following embodiments, and can be implemented by appropriately changing the embodiments within the scope conforming to the gist described above and below, and all of them are included in the technical scope of the present invention. Note that, in each drawing, hatching, component reference numerals, and the like may be omitted for convenience, but in this case, the description and other drawings are referred to. In addition, the dimensions of the various components in the drawings are preferred to facilitate an understanding of the features of the present invention, and thus may differ from actual dimensions.
An embodiment of an electrical apparatus for defibrillation inside a cardiac chamber according to the present invention includes: a capacitor that accumulates charge; load resistance R b The load resistance R b Is electrically connected with the capacitor for flowing discharge current from the capacitor, and the load resistor R b Is higher than 50 Ω; a measuring part electrically connected to the capacitor to obtain a voltage of the capacitor; and an estimation unit for estimating a load resistance R using a capacitor in which a predetermined charge is accumulated b The value of the voltage of the capacitor after discharge is calculated as the discharge energy of the capacitor having stored a predetermined charge with respect to a predetermined analog resistance R a Generated during discharge, the predetermined analog resistance R a Is configured to have a resistance value lower than that of the load resistor R b And simulates the heart of a human body. In the electrical apparatus for defibrillation inside the cardiac chamber, a load resistance R is used b The value of the voltage of the capacitor after discharge is calculated and estimated to be in relation to the analog resistance R a Discharge energy generated when discharging is performed. Load resistance R b Having an analogue resistance R higher than that of the heart simulating the human body a Thus even to the load resistance R b The load resistance R can be suppressed by discharging the predetermined energy continuously for a plurality of times b Can also reduce the load resistance R b Risk of breakage due to overheating.
In the present invention, the electrical device for defibrillation inside the heart chamber is connected to a defibrillation catheter inserted into the heart chamber, and applies a voltage to a plurality of electrodes provided in the defibrillation catheter. Hereinafter, the electrical apparatus for defibrillation inside the heart chamber may be referred to simply as "electrical apparatus". In the present invention, the unit of voltage is V, the unit of each resistance is Ω, the unit of capacitance C of the capacitor is F, the unit of each energy is J, and the unit of time is seconds.
Hereinafter, the structure of the electric apparatus will be described with reference to fig. 1. Fig. 1 shows a block diagram of an electric device according to an embodiment of the present invention. The electric device 1 comprises a capacitor 2, a measuring part 3, and a load resistor R b And an estimation unit 5. The capacitor 2 is an element for charging an applied voltage for defibrillation, and accumulates electric charges. The input receiving unit 9 described later is operated to start charging the capacitor 2.
In fig. 1, a power supply unit 8 is electrically connected to the capacitor 2 to charge 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 may include a power supply, a booster circuit for boosting a dc voltage, and a charging circuit. At least a part of them may be provided outside the power supply section 8. 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.
As shown in fig. 1, the electric device 1 is preferably provided with an input receiving unit 9 that receives an input operation such as charging of the capacitor 2 from a user. The input receiving unit 9 may include an input unit such as a push switch, a lever, or a touch panel. The input receiving unit 9 may receive the start/stop of the electric device 1 and the resistance to the load R b The application start voltage, the setting of the application energy, the charging and discharging of the capacitor 2, the selection of the electrode to be applied, and the like.
As shown in fig. 1, the input receiving unit 9 is preferably connected to the arithmetic processing control unit 4. It is preferable that the operation of opening and closing the switch between the power supply unit 8 and the capacitor 2 be controlled by the arithmetic processing control unit 4. Thus, 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 receiving unit 9 may be connected to the power supply unit 8. Thereby, the electric signal is transmitted from the input receiving unit 9 to the power supply unit 8 in response to the operation of the input receiving unit 9.
The measuring section 3 is electrically connected to the capacitor 2 and obtains the voltage of the capacitor 2. This ensures electrical conductivity between the capacitor 2 and the measuring section 3. Preferably, the measuring section 3 is connected in parallel to the capacitor 2. The measuring section 3 can be a voltage detection circuit. The voltage detection circuit may include a resistor circuit including a plurality of resistors, an analog-digital converter, an amplifier that amplifies an electric signal, a filter that removes noise, and the like.
In the measuring section 3, a load resistance R applied thereto may be used b The discharged voltage of the capacitor 2 is used to calculate the residual energy of the capacitor 2.
Load resistance R b Is an element provided to apply energy at the time of inspection of the electric apparatus 1. Load(s)Resistance R b Is electrically connected to the capacitor 2, through which a discharge current flows from the capacitor 2, and has a load resistance R b Is higher than 50 omega. As a load resistor R b A fixed resistor having a constant resistance value or a variable resistor having a changeable resistance value can be used. In addition, as the load resistor R b Blade resistors may also be used.
Load resistance R b The resistance value of (c) may be more than 50 Ω, and may be, for example, 60 Ω to 80 Ω, 100 Ω, 300 Ω to 200 Ω, 150 Ω, or less. Generally, the resistance value of the heart of a human body is about 50 Ω. In the examination of the defibrillator, it was confirmed whether or not the load resistance of 50 Ω equal to the resistance value of the heart of the human body can be applied appropriately. However, when a load resistor (internal resistor) incorporated in a conventional defibrillator is continuously discharged, the load resistor may overheat and be damaged. Therefore, in the present invention, in order to suppress heat generation of the load resistor, the load resistor R having a resistance value exceeding 50 Ω is used b 。
The estimating unit 5 uses the capacitor 2 in which a predetermined charge is accumulated with respect to the load resistance R b The value of the voltage of the capacitor 2 after the discharge is calculated as the discharge energy of the capacitor 2 having stored the predetermined charge with respect to the predetermined analog resistance R a Generated during discharge, the predetermined analog resistance R a Is configured to have a resistance value lower than that of the load resistor R b And simulates the heart of a human body. In the electrical apparatus 1, the load resistance R is used b The value of the voltage of the capacitor 2 after the discharge is calculated and estimated to be in relation to the analog resistance R a Discharge energy generated when discharging is performed. Load resistance R b Having an analogue resistance R higher than that of the heart simulating the human body a So that even for the load resistance R b The load resistance R can be suppressed by discharging the predetermined energy continuously for a plurality of times b Can also reduce the load resistance R b Risk of breakage due to overheating. Further, the analog resistance R is preferable a The resistance value of (2) is 50 Ω.
The estimation unit 5 preferably calculates the discharge energy automatically within 30 minutes after the main power supply of the electrical apparatus 1 is turned on, more preferably within 15 minutes, and still more preferably within 5 minutes. This enables automatic estimation of the resistance R applied to the analog resistor each time the electric device 1 is used a The discharge energy at the time of operation, so that the user can check without fail even if he forgets it. Further, the calculation of the discharge energy by the estimation unit 5 may be performed by automatically turning on the main power supply of the electric apparatus 1 at a predetermined timing. The setting timing of turning on the main power supply can be set to a time when the electric apparatus 1 is not used, such as at night.
Hereinafter, the capacitor 2 estimated to store a predetermined charge is referred to as the analog resistance R a A method of calculating discharge energy generated when discharging is performed will be described.
FIG. 2 shows a diagram illustrating the discharge energy E of the electric apparatus 1 shown in FIG. 1 s A chart of the calculation method of (1). The solid line of fig. 2 represents the load resistance R b The voltage waveform of the capacitor 2 at 150 Ω, and the broken line indicates the simulated resistance R a The voltage waveform of the capacitor 2 at 50 Ω, and the dotted line shows a discharge resistance R described later c The voltage waveform of the capacitor 2 at 220 omega. 1 st prescribed time T a Representing the slave to analogue resistance R a To discharge completion time T a1 The time until, 2 nd predetermined time T b Representing the load resistance R b To discharge completion time T b1 The time until, 3 rd predetermined time T c Representing the load resistance R b To the load resistance R b Is discharged for a 1 st predetermined time T a Then switched to discharge resistance R c Discharge completion time T in the case where discharge is performed c1 The time until that. V a Is to an analog resistance R a Time T of completion of discharge a1 Virtual voltage value of capacitor 2, V b Is to the load resistance R b Time T of completion of discharge b1 Voltage value of capacitor 2, V c Is to the load resistance R b Discharge is discharged1 st predetermined time T a Then switched to discharge resistance R c Time T at which discharge is performed and the discharge is completed c1 The voltage value of capacitor 2. Preferably, the measuring section 3 obtains the load resistance R of the capacitor 2 b Voltage V of capacitor 2 before the start of discharge 0 And 1 st predetermined time T from the start of discharge of capacitor 2 a Voltage V of the subsequent capacitor 2 ab The estimating unit 5 calculates the capacitance C of the capacitor 2 based on the following expression (1), and calculates the capacitance C of the capacitor 2 with respect to the simulated resistance R based on the following expression (2) a 1 st predetermined time T a Voltage V of subsequent capacitor 2 a The capacitance 2 with respect to the analog resistance R is calculated from the following equation (3) a Is discharged for a 1 st predetermined time T a Discharge energy of time E s . In FIG. 2, the discharge energy E s Shown with cross hatching. In the electric device 1, the discharge energy E in the formula (3) is calculated s Then, the present electrostatic capacitance C of the capacitor 2 calculated according to the equation (1) is used. Therefore, even if the capacitance C is reduced by the aged deterioration of the capacitor 2, the actual discharge energy E can be calculated s 。
[ equation 8 ]
[ number formula 9 ]
[ number formula 10 ]
Wherein, in the above formulas (1) to (3), R is the load resistance R b The loss resistance existing in the electric device 1 is not limited to the above, and e is a nanopillar constant.
More specifically, according to the above formula (3), the compound (A) can be usedThe value of the application energy (for example, 10J, 20J, 30J) which may be used for applying the electric device 1, and V which can be arbitrarily set as the performance of the electric device 1 can be used 0 And the capacitance C of the capacitor 2, and whether or not discharge should be performed until the voltage V of the capacitor 2 a What value is reached. Further, according to the equation (2), the selected value of the applied energy and the load resistance R of the capacitor 2 can be used b Voltage V of capacitor 2 before the start of discharge 0 Calculated V a Analog resistance R a And a loss resistance r existing in the electric device 1 to calculate the 1 st predetermined time T a . Thereby, the voltage V of the capacitor 2, which is appropriate in terms of use or design of the electric device 1, can be obtained 0 And V a 1 st predetermined time T a And a discharge curve relating to a value of the application energy that may be used for applying the electrical device 1. The electrical device 1 preferably has such a discharge curve. The user can select the value of the energy to be applied according to the state of the patient, thereby V can be predetermined 0 、V a 、T a Defibrillation is performed.
At discharge energy E s In the calculation of (2), the voltage V of the capacitor 2 0 The capacitor 2 may be connected to the load resistor R b Voltage of the capacitor 2 at the start of discharge.
The discharge energy E may be calculated by a method different from the above-described method s . For example, it is preferable that the measuring section 3 obtains the load resistance R of the capacitor 2 b Voltage V of capacitor 2 before the start of discharge 0 And 1 st predetermined time T from the start of discharge of capacitor 2 a Voltage V of subsequent capacitor 2 ab The estimating unit 5 calculates the capacitance C of the capacitor 2 from the following expression (1), and calculates the discharge energy E from the following expression (4) s . In this method, the discharge energy E in equation (4) is calculated s Then, the capacitance C of the capacitor 2 calculated according to the equation (1) is used. Therefore, even if the capacitance C is reduced by the aged deterioration of the capacitor 2, the actual discharge energy E can be calculated s . In addition, unlike the above-described method, V is not used a Therefore, the discharge energy E can be rapidly performed s The calculation of (2).
[ number formula 11 ]
[ equation 12 ]
Wherein, in the above formula (1) and formula (4), R is a load resistance R b The loss resistance existing in the electric device 1 is not limited to the above, and e is a nanopillar constant.
In the electric device 1, the discharge energy E may be s A warning is issued when the specified energy is undershot. For example, the electric device 1 may further include: a control unit 6, connected to the capacitor 2 and the measurement unit 3, for controlling charging and discharging of the capacitor 2; an input receiving unit 9, the input receiving unit 9 being connected to the control unit 6, for receiving a load resistance R applied from a user b Set energy E of 0 Performing a set input operation; and a warning unit 13, wherein the warning unit 13 issues a warning to the user. In this case, the control unit 6 preferably sets the reference energy E to a predetermined range 1 And discharge energy E s Comparing the reference energy E in the predetermined range 1 Based on the setting energy E inputted by the input receiving unit 9 0 Then, the warning unit 13 determines the discharge energy E s Lower than reference energy E 1 A warning is issued. To reference energy E 1 And discharge energy E s Comparing at discharge energy E s Lower than reference energy E 1 When the user desires to perform the replacement, a warning is issued, whereby the user can be prompted to confirm the state of the capacitor 2. As a result, the energy required for defibrillation can be ensured. Further, the reference energy E is preferable 1 With respect to the set energy E 0 Within a range of. + -. 15% or. + -. 3J.
In the control unit 6, it is preferable to set the load resistance R b The application start voltage and the application time. It is preferable that the control unit 6 use the setting energy E input to the input receiving unit 9 0 To set a load resistance R b The application start voltage of (1).
As the warning unit 13, a display, a warning lamp, and a speaker provided in the electric device 1 can be used. In addition, as the warning unit 13, a display, a speaker, an earphone, or the like of a personal computer, a tablet computer, a smartphone, or the like can be used. The warning by the warning unit 13 includes a mode in which the warning unit 13 emits sound, light, a still image, a moving image, or the like.
The warning unit 13 may issue a warning when the remaining energy of the capacitor 2 is greater than the 1 st predetermined value. This makes it possible to confirm whether or not the setting energy E is input at a higher level than the input receiving unit 9 0 A small value is discharged.
The warning unit 13 may issue a warning when the remaining energy of the capacitor 2 is less than the 2 nd predetermined value. This makes it possible to confirm whether or not the set energy E is inputted to the input receiving unit 9 0 The above discharge is performed. The 2 nd predetermined value can be set to a value smaller than the 1 st predetermined value.
The comparison between the remaining energy of the capacitor 2 and the 1 st or 2 nd predetermined value can be performed by a comparison unit (not shown) or a control unit 6 preferably provided in the arithmetic processing control unit 4. The 1 st and 2 nd predetermined values may be set in advance in the comparison unit or in a memory (not shown) stored in the arithmetic processing control unit 4, or may be supplied to the electric device 1 from a recording medium or the like. The 1 st and 2 nd predetermined values may be stored in the same or different memories or comparison units, respectively.
As shown in fig. 1, the electric device 1 may have a recording unit 14, and the recording unit 14 may record the discharge energy of the capacitor 2 and the load resistance R b The applied voltage, the applied time, the applied energy, the discharge start time, the discharge end time, the voltage before discharge, the voltage after discharge, the electrocardiographic waveform, and the like of the capacitor 2. Thus, the user can refer to the past examinationRecord lookup, etc.
As shown in fig. 1, the electric device 1 may have a display unit 15, and the display unit 15 may display the discharge energy of the capacitor 2 and the load resistance R b The applied voltage, the applied time, the applied energy, the discharge start time, the discharge end time, the voltage before discharge, the voltage after discharge, the electrocardiographic waveform, and the like of the capacitor 2. As the display unit 15, a display, a warning lamp, and a speaker provided in the electric device 1 can be used. As the display unit 15, a display of a personal computer, a tablet computer, a smartphone, or the like can be used. The display unit 15 may also serve as the warning unit 13.
Although not shown, the electric device 1 may have an impedance measuring unit, which is connected to the control unit 6 and the load resistor R b Connecting and measuring the load resistance R b The impedance of (c). In this case, it is preferable to set the load resistance R using the impedance value measured by the impedance measuring unit b The application time of (c). This enables the load resistance R to be appropriately set b The applied energy of (1).
Preferably, the electric device 1 further includes: a power supply unit 8, the power supply unit 8 being connected to the capacitor 2 and generating an applied voltage; and a discharge resistor R c The discharge resistance R c At a specific load resistance R b The capacitor 2 is connected to the power supply unit 8 side and is applied to the load resistor R b The remaining energy of the capacitor 2 is discharged. Capable of discharging the residual energy of the capacitor 2 to the discharge resistor R c Therefore, it is possible to prevent the resistance from being applied to the load resistance R b The energy assumed above is applied.
Preferably, the electrical device 1 has a discharge energy E for confirmation of the estimate s Is measured. For example, it is preferable that the measuring unit 3 measures the load resistance R of the secondary capacitor 2 b And a discharge resistor R c Is started to pass through the 3 rd predetermined time T c Voltage V of the subsequent capacitor 2 c The estimating unit 5 calculates the load resistance R of the capacitor 2 based on the following equation (5) b And a discharge resistor R c Is discharged for a 3 rd predetermined time T c Discharge energy of time E r To discharge energy E s And putElectric energy E r A comparison is made. To discharge energy E s And discharge energy E r By comparing the discharge energies, the estimated discharge energy E can be grasped s To the accuracy of (c).
[ equation 13 ]
As another method, it is preferable that the measuring section 3 measures the load resistance R from the capacitor 2 b And a discharge resistor R c Is started to pass through the 3 rd predetermined time T c Voltage V of subsequent capacitor 2 c The estimating unit 5 calculates the load resistance R of the capacitor 2 based on the following equation (6) b And a discharge resistor R c Is discharged for a 3 rd predetermined time T c Discharge energy of time E r To discharge energy E s And discharge energy E r A comparison is made. To discharge energy E s And discharge energy E r By comparing the discharge energies, the estimated discharge energy E can be grasped s To the accuracy of (2).
[ NUMBER FORM 14 ]
In the electric device 1, the discharge resistor R is preferably c The resistance value of (A) is an analog resistance R a Is not less than the resistance value of (1). Load resistance R b Is higher than the analog resistance R a And discharge resistance R c The resistance value of (A) is an analog resistance R a Is higher than the resistance value of (1), thereby having a resistance value higher than the resistance value of the analog resistor R during the entire time from the start to the completion of the discharge of the capacitor 2 a The resistance of the resistance value of (2) continues to discharge. Therefore, with respect to only the analog resistance R a In the case of performing discharge, the discharge time can be extended, and the amount of heat generated by the resistor per unit time can be suppressed.
Discharge resistor R c The resistance value of (2) is preferably 100 Ω or more, more preferably 200 Ω or more, and further more preferablyPreferably 300 Ω or more. In addition, a discharge resistor R c The resistance value of (b) is preferably 1000 Ω or less, more preferably 800 Ω or less, and further preferably 600 Ω or less. Thereby, the discharge resistance R can be controlled c The time required for completing the discharge becomes an appropriate length.
Load resistance R b Preferably the resistance value of (2) and the discharge resistance R c The resistance values of (a) are equal. Accordingly, since the formula (5) is the following formula (5) -1 and the formula (6) is the following formula (6) -1, the discharge energy E is easily generated r And (4) calculating.
[ equation 15 ]
[ number formula 16 ]
At the load resistance R b Resistance value and discharge resistance R c When the resistance values of (2) are equal, with respect to the discharge resistance R c Discharge curve (dotted line in fig. 2) and the voltage versus load resistance R b Discharge curves (solid line of fig. 2) of (d) are identical, V c ＝V b ，T c ＝T b . In this case, the time T required for discharge b And relative to T a Is proportional to the magnitude of the resistance value of (c), and ideally, T b ＝T a ·R b /R a 。
In the electric apparatus 1, a load resistor R b May be connected to the discharge resistor R c The resistance value of (2) is different. At the 1 st prescribed time T a Then, with respect to the discharge resistance R c Applying is carried out with the discharge completion time from T b1 Is changed into T c1 . Capacitor voltage from V b To V c Time until discharge, i.e. from load resistance R b Switching to discharge resistor R c The time until the end of the application is related to the load resistance R b As required in the case ofDischarge time (T) b －T a ) And is elongated in proportion to the magnitude of the resistance value. In detail, (T) b －T a )×R c /R b ＝T a ×(R b －R a )R c /R a R b . Due to V 0 ～V ab Time (to load resistance R) b Is T) is a Therefore V is 0 ～V b Time T of c Ideally is T c ＝T a ×{R a R b +(R b －R a )R c }/R a R b 。
The electric device 1 of fig. 1 includes a waveform generating unit 10. The waveform generator 10 generates an energization waveform. The energization waveform may be a bipolar waveform in which the polarity is inverted halfway, or a unipolar waveform in which the polarity is constant, but the bipolar waveform is preferable because stimulation can be performed with less energy. The energization energy applied to the living body can be set to, for example, 1J to 30J.
The electrical device 1 of fig. 1 has an electrocardiographic waveform input section 12. In this case, it is preferable that the electrocardiographic waveform information output from the electrocardiograph 35 be input internally from the electrocardiographic waveform input unit 12 via a lead wire or the like. When the electrocardiographic waveform input unit 12 is connected to a body surface electrode 24 described later, the electrocardiographic waveform input unit 12 is preferably capable of receiving 5kV of electric discharge input via a resistance of 50 Ω. When the electrocardiographic waveform input from the electrocardiographic waveform input unit 12 satisfies a predetermined condition, it is possible to perform control so that an enable signal generating unit (not shown) preferably provided in the arithmetic processing control unit 4 generates an enable signal for turning on various switches in the electric device 1. When the switch is turned on, the electrode of the catheter described later can be energized.
The preferred electrocardiographic waveform is a waveform obtained by easily detecting the II < th > lead of an event inferred to be an R-wave. However, the electrocardiographic waveform is not limited to the II-th lead, and may be obtained from another lead according to the orientation of the patient's heart. For example, in the case of obtaining an electrocardiographic waveform through 12 leads, the electrocardiographic waveform may also be a waveform obtained through V1 lead, V2 lead, V3 lead, V4 lead, V5 lead, V6 lead, I lead, II lead, III lead, aVR lead, aVL lead, or aVF lead. The electrocardiographic waveform may be an average waveform of 2 or more leads, an average waveform of 3 or more leads, or an average waveform of 12 leads.
At least any one of the functions of the electric 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 electrocardiographic waveform input unit 12, the permission signal generation unit, the memory, and the like may be realized by hardware or may be realized by software. The hardware includes logic circuits formed in Integrated circuits such as LSI (Large Scale Integration), ASIC (Application Specific Integrated Circuit), FPGA (Field Programmable Gate Array), and the like.
The electric device 1 may include a computer that executes instructions of a program that is software for realizing the functions of at least one 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 electrocardiographic waveform input unit 12, the permission signal generation unit, and the memory. Preferably, the computer includes a processor and a computer-readable recording medium storing the program. The above-described functions can be realized by executing a program stored in a computer-readable recording medium by a processor. 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. The recording medium may include a RAM (Random Access Memory). The program may be supplied to the computer via an arbitrary transmission medium capable of transmitting the program. Examples of the transmission medium include a communication network and a communication line.
The present invention also provides an intracardiac defibrillation catheter system. Figure 3 illustrates a schematic diagram of an intracardiac defibrillation catheter system in accordance with one embodiment of the present invention. As shown in fig. 3, an intracardiac defibrillation catheter system 40 includes: a catheter 20, which is inserted into the heart chamber, has a distal end and a proximal end, and has a plurality of electrodes disposed on the distal side of the catheter 20; and the electric device 1 for applying a voltage to the plurality of electrodes. In addition, hereinafter, there are cases where defibrillation catheter system 40 within the cardiac chamber is simply referred to as system 40.
The proximal side of the catheter 20 is located on the hand side of the operator (operator) with respect to the extending direction of the catheter 20, and the distal side is the opposite direction of the proximal side (i.e., the direction of the treatment target side). The proximal portion of the catheter 20 is a half portion located on the hand side of the user with respect to the extending direction of the catheter 20, and the distal portion of the catheter 20 is a portion other than the proximal portion (i.e., a treatment target side half portion of the catheter 20).
In fig. 3, the catheter 20 and the electrical device 1 are connected by a 1 st lead 31, and the electrical device 1 and the electrocardiograph 35 are connected by a 2 nd lead 32. Thereby, the intracardiac potential information transmitted from the catheter 20 is input to the electrocardiograph 35 via the 2 nd lead wire 32 and the like by the electrical device 1. Electrocardiographic information obtained from a body surface electrode 24 described later is transmitted to the electrocardiograph 35, and electrocardiographic waveform information output from the electrocardiograph 35 is preferably input from the electrocardiographic waveform input unit 12 to the inside of the electric apparatus 1 via the 3 rd lead 33 and the like.
The conduit 20 may be a resin tube formed in a cylindrical shape. As shown in fig. 3, the catheter 20 preferably includes a 1 st electrode group including a plurality of 1 st electrodes 21, and a 2 nd electrode group including a plurality of 2 nd electrodes 22, which is disposed on the proximal side of the 1 st electrode group. More preferably, the 1 st electrode group is disposed at a position corresponding to the coronary sinus, and the 2 nd electrode group is disposed at a position corresponding to the right atrium. The catheter 20 may include a 3 rd electrode group having a plurality of 3 rd electrodes 23 for measuring the intracardiac potential, which is disposed on the proximal side of the 2 nd electrode group. The 3 rd electrode group can be disposed at a position corresponding to, for example, the upper pulse. Preferably, the 3 rd electrode group is not connected to the power supply unit 8. This makes it easy to use the 3 rd electrode group as a dedicated electrode for measuring the intracardiac potential.
Each electrode group is preferably present in a region of more than half of the outer circumference of the resin tube, and more preferably formed in a ring shape. Since the electrode is formed as described above, the contact area with the heart increases, and thus the intracardiac potential measurement and the application of electrical stimulation are facilitated. Each electrode group may contain a conductive material such as platinum or stainless steel, but preferably contains an X-ray opaque material such as platinum in order to facilitate grasping of the position of the electrode under X-ray fluoroscopy.
The electrical apparatus 1 of fig. 1 is provided with a patient connection unit 11, and the patient connection unit 11 includes a 1 st connection unit connected to a plurality of electrodes provided on the catheter 20, and a 2 nd connection unit connected to the electrocardiograph 35. Although not shown, the electric apparatus 1 may have a switching unit that is connected to the power supply unit 8 and switches between a 1 st mode for measuring the intracardiac potential and a 2 nd mode for applying a voltage while measuring the intracardiac potential. Preferably, the 1 st connection unit is connected to the power supply unit 8 via the switching unit, and the 1 st connection unit is not connected to the 2 nd connection unit via the switching unit. Since the 1 st connection part is not connected to the 2 nd connection part by the switching part, the local potential at each electrode can be measured even at the time of defibrillation.
The system 40 may also have a body surface electrode 24 disposed on the body surface of the human body. This enables electrocardiographic information to be acquired and transmitted to the electrocardiograph 35. The electrode for acquiring electrocardiographic information is not limited to the body surface electrode 24, and may be an electrode for measuring an intracardiac potential, but the body surface electrode 24 is preferable because it is excellent in the detection sensitivity of R-waves. As the body surface electrode 24, an electrode for 12 lead is preferable.
A nose blade 25 may also be provided at the distal end of the catheter 20. The tip blade 25 may have a tapered portion whose outer diameter decreases toward the distal side. The tip blade 25 may be made of a conductive material so that the tip blade 25 functions as an electrode. The distal end blade 25 may be made of a polymer material, and the hardness of the distal end blade 25 may be lower than that of the resin tube in order to protect the body tissue.
As shown in fig. 3, an operation portion 26 to be held by a user is preferably provided on the proximal side of the catheter 20.
The system 40 may also be provided with an electrocardiograph 35. The electrocardiograph 35 measures intracardiac potentials through various electrodes. As the electrocardiograph 35, a known electrocardiograph can be used.
The invention also provides a method for inspecting the electrical apparatus for defibrillation 1 in the heart chamber. Heart of one embodiment of the inventionThe main point of the inspection method of the electrical apparatus for intracavitary defibrillation 1 is to sequentially perform the following steps before defibrillation to a patient: charging the capacitor 2; with respect to a load resistance R electrically connected to the capacitor 2 and having a resistance value higher than 50 omega b Discharging; obtaining the voltage of the capacitor 2 after discharging; and calculating a discharge energy of the capacitor 2 with respect to a predetermined analog resistance R based on the obtained voltage of the capacitor 2 a Generated during discharge, the predetermined analog resistance R a Is configured to have a resistance value lower than that of the load resistor R b And simulates the heart of a human body. In the method of inspecting the electrical defibrillation apparatus 1, the resistance to load R is used b The value of the voltage of the capacitor 2 after the discharge is calculated and estimated to be in relation to the analog resistance R a Discharge energy generated when discharging is performed. Load resistance R b Having an analogue resistance R higher than that of the heart simulating the human body a Thus even to the load resistance R b The load resistance R can be suppressed by discharging the predetermined energy continuously for a plurality of times b Can also reduce the load resistance R b Risk of breakage due to overheating. Further, by sequentially performing the above-described steps before defibrillation to the patient, omission of examination can be prevented, and the electrical apparatus for defibrillation 1 in the cardiac chamber can be safely used.
In the above-described method for inspecting the electrical apparatus for defibrillation 1 in the cardiac chamber, it is preferable that the step of charging the capacitor 2, the step of discharging the capacitor 2, the step of acquiring the voltage of the capacitor 2, and the step of calculating the discharge energy are performed in a state where the electrical apparatus for defibrillation 1 in the cardiac chamber, the defibrillation catheter in the cardiac chamber, and the electrocardiograph are not electrically connected. Since the procedure of charging and discharging the capacitor 2 is included in a state where the electrical defibrillation apparatus 1 in the cardiac chamber, the defibrillation catheter in the cardiac chamber, and the electrocardiograph are not electrically connected, erroneous application to the human body during examination can be suppressed.
Further, the step of charging the capacitor 2, the step of discharging the capacitor 2, the step of acquiring the voltage of the capacitor 2, and the step of calculating the discharge energy may be performed in a state where the electrical device for defibrillation in the cardiac chamber 1 is electrically connected to the electrocardiograph and the electrical device for defibrillation in the cardiac chamber 1 is not electrically connected to the defibrillation catheter in the cardiac chamber. At least the defibrillation electric apparatus 1 in the heart chamber is not electrically connected to the defibrillation catheter, and thus erroneous application to the human body at the time of examination can be suppressed.
The present application claims benefit based on priority of japanese patent application No. 2020-99536, filed on 8/6/2020. The entire contents of the specification of japanese patent application No. 2020-99536, filed on 8/6/2020, are incorporated herein by reference.
Description of the reference numerals
1 \ 8230, an electrical device for defibrillation in the cardiac chamber (electrical device); 2\8230acapacitor; 3 823000, a measurement part; 4\8230andan operation processing control part; 5 \ 8230and an inference part; 6 8230a control part; 8, 8230and a power supply part; 9\8230theinput acceptance part; 10 8230and a waveform generating part; 11 8230a patient connection; 12\8230aelectrocardio waveform input part; 13 8230and a warning part; 14 \ 8230and a recording section; 15, 8230and a display part; 20 \ 8230and a conduit; 21 \ 8230and 1 st electrode; 22\8230a2 nd electrode; 23, 8230and a 3 rd electrode; 24\8230abody surface electrode; 25 \ 8230and a front blade; 26 \ 8230and an operation part; 31\8230a1 st conducting wire; 32 \ 8230and 2 nd wire; 33 \ 8230and 3 rd lead; 35 \ 8230and electrocardiograph; 40 \ 8230a defibrillation catheter system in the cardiac chamber; c8230and electrostatic capacitance; e 0 8230and setting energy; e 1 823080 and reference energy; e r 8230that the capacitor discharges the discharge energy at 3 rd specified time relative to the load resistance and the discharge resistance; e s 8230the capacitor discharges the discharge energy at the 1 st specified time relative to the analog resistor; r a 8230model resistance; r b 823080, load resistance; r is c 8230and discharge resistance; r 8230, loss of resistance; t is a 8230, 1, stipulated time; t is a unit of a1 8230indicating the time when the discharge of the analog resistor is finished; t is b 8230, at 2, at a specified time; t is b1 8230indicating the time when the discharge of the load resistor is completed; t is a unit of c 8230rd 3, stipulate time; t is a unit of c1 8230indicating the time when the discharge of the discharge resistor is completed; v 0 8230the voltage of the capacitor before the discharge of the capacitor with respect to the load resistance starts; v a 8230the virtual voltage of the capacitor at the moment when the discharge of the analog resistor is completed; v b 8230the voltage of the capacitor at the moment when the discharge of the load resistance is completed; v c 8230the voltage of the capacitor at the moment when the discharge of the discharge resistor is completed; v ab 8230the voltage of the capacitor after the lapse of a predetermined time from the start of discharge of the capacitor 1.
Claims (13)
1. An electrical apparatus for defibrillation in a heart chamber, comprising:
a capacitor that accumulates charges;
load resistance R b Said load resistance R b A load resistor R electrically connected to the capacitor for passing a discharge current from the capacitor b Is higher than 50 Ω;
a measuring section electrically connected to the capacitor and configured to obtain a voltage of the capacitor; and
an estimation unit for estimating the load resistance R using the capacitor in which a predetermined charge is accumulated b The value of the voltage of the capacitor after the discharge is calculated as the discharge energy of the capacitor having accumulated the predetermined charge with respect to the predetermined analog resistance R a The predetermined analog resistance R generated during discharge a Is configured to have a resistance value lower than the load resistance R b And simulates the heart of a human body.
2. The electrical apparatus for defibrillation according to claim 1,
the measuring section obtains the capacitance with respect to the load resistance R b Before the start of discharge of said capacitor 0 And 1 st prescribed time T from the start of discharge of the capacitor a Voltage V of the capacitor ab ，
The estimation unit calculates a capacitance C of the capacitor according to the following formula (1), and calculates a resistance R from the capacitor to the analog resistance R according to the following formula (2) a The 1 st predetermined time T is elapsed after the start of discharge a The electricity afterVoltage V of the container a Calculating the capacitance with respect to the analog resistance R according to the following formula (3) a Is discharged for the 1 st predetermined time T a Discharge energy of time E s [ equation 1 ]
[ equation 2 ]
[ equation 3 ]
Wherein, in the above formulas (1) to (3), R is the division of the load resistance R b A loss resistance, e being a nanopiere constant, that is externally present in the electrical apparatus for defibrillation in the cardiac chamber.
3. The electrical apparatus for defibrillation inside a heart chamber according to claim 1,
the measuring part obtains the capacitance corresponding to the load resistance R b Before the start of discharge of said capacitor V 0 And 1 st prescribed time T from the start of discharge of the capacitor a Voltage V of the capacitor ab ，
The estimating unit calculates a capacitance C of the capacitor based on the following formula (1), and calculates the discharge energy E based on the following formula (4) s ，
[ equation 4 ]
[ equation 5 ]
Wherein, in the above formulas (1) and (4), R is the division of the load resistance R b A loss resistance, e being a nanopiere constant, that is externally present in the electrical apparatus for defibrillation in the cardiac chamber.
4. The electrical apparatus for defibrillation according to claim 2 or 3, further comprising:
a control unit connected to the capacitor and the measurement unit, and configured to control charging and discharging of the capacitor;
an input receiving unit connected to the control unit and receiving a signal from a user to apply the signal to the load resistor R b Set energy E of 0 Performing a set input operation; and
a warning section that issues a warning with respect to the user,
the control unit controls the reference energy E in a predetermined range 1 And the discharge energy E s Comparing the reference energy E of the specified range 1 Based on the setting energy E inputted by the input receiving part 0 And then it is decided that,
the warning unit generates the discharge energy E s Below the reference energy E 1 A warning is issued.
5. The electrical apparatus for defibrillation according to any one of claims 2 to 4, further comprising:
a power supply unit connected to the capacitor and generating an applied voltage; and
discharge resistor R c The discharge resistance R c At a voltage lower than the load resistance R b The capacitor is connected to the power source side, and is applied to the load resistor R b The electricity afterThe remaining energy of the vessel is discharged.
6. The electrical apparatus for defibrillation inside a heart chamber according to claim 5,
the measuring unit measures the load resistance R from the capacitor b And the discharge resistor R c The discharge of (2) is started to pass through the 3 rd predetermined time T c Voltage V of the capacitor c ，
The estimating unit calculates the load resistance R of the capacitor based on the following equation (5) b And the discharge resistor R c Is discharged for the 3 rd predetermined time T c Discharge energy of time E r For the discharge energy E s And the discharge energy E r The comparison is carried out in such a way that,
[ equation 6 ]
7. The electrical apparatus for defibrillation according to claim 5,
the measuring unit measures the load resistance R from the capacitor b And the discharge resistor R c Is started to pass through the 3 rd predetermined time T c Voltage V of the capacitor c ，
The estimation unit calculates the load resistance R of the capacitor based on the following equation (6) b And the discharge resistor R c Is discharged for the 3 rd predetermined time T c Discharge energy of time E r For the discharge energy E s And the discharge energy E r The comparison is carried out in such a way that,
[ equation 7 ]
8. The electrical apparatus for defibrillation according to any one of claims 5 to 7,
the discharge resistor R c The resistance value of is the analog resistance R a Is not less than the resistance value of (1).
9. The electrical apparatus for defibrillation according to any one of claims 5 to 8,
the load resistor R b And the discharge resistor R c The resistance values of (a) are equal.
10. The electrical apparatus for defibrillation according to any one of claims 1 to 9,
the estimation unit automatically calculates the discharge energy within 30 minutes after the main power supply of the electrical apparatus for defibrillation inside the cardiac chamber is turned on.
11. A defibrillation catheter system in a cardiac chamber, comprising:
a catheter inserted into a cardiac chamber, having a distal end and a proximal end, the catheter having a plurality of electrodes disposed on a distal side thereof; and
the electrical intracardiac defibrillation device according to any one of claims 1 to 10, wherein said electrical intracardiac defibrillation device applies a voltage to said plurality of electrodes.
12. A method of inspecting an electrical device for defibrillation inside a heart chamber,
prior to defibrillation relative to a patient, the following procedures are performed in sequence:
charging the capacitor;
with respect to a load resistance R electrically connected with the capacitor and having a resistance value higher than 50 Ω b Discharging;
obtaining a voltage of the capacitor after discharging; and
according to the obtained electricityThe voltage of the capacitor is calculated as the discharge energy of the capacitor with respect to a predetermined analog resistance R a The predetermined analog resistance R generated during discharge a Is configured to have a resistance value lower than the load resistance R b And simulates the heart of a human body.
13. The method of inspecting an electrical defibrillation apparatus according to claim 12,
the method includes the steps of charging the capacitor, discharging the capacitor, acquiring a voltage of the capacitor, and calculating the discharge energy, without electrically connecting the electrical defibrillation apparatus in the cardiac chamber, the defibrillation catheter in the cardiac chamber, and the electrocardiograph.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
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| JP2020-099536 | 2020-06-08 | ||
| JP2020099536 | 2020-06-08 | ||
| PCT/JP2021/017441 WO2021251033A1 (en) | 2020-06-08 | 2021-05-07 | Electrical device for intracardiac defibrillation, intracardiac defibrillation catheter system, and method for inspecting electrical device for intracardiac defibrillation |
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| CN115697473A true CN115697473A (en) | 2023-02-03 |
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| JP4385245B2 (en) * | 2002-12-06 | 2009-12-16 | 日本光電工業株式会社 | Defibrillator |
| US10272010B2 (en) * | 2015-03-20 | 2019-04-30 | Zoll Medical Corporation | Systems and methods for testing a medical device |
| US10300293B2 (en) * | 2016-02-26 | 2019-05-28 | Zoll Medical Corporation | Pediatric and adult defibrillator |
| WO2019155941A1 (en) * | 2018-02-07 | 2019-08-15 | 株式会社カネカ | Defibrillation catheter system, defibrillation power source device, and control method for defibrillation power source device |
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