Defibrillator and waveform display method

Abstract

To provide a defibrillator capable of informing clearly of transition to a synchronous mode.SOLUTION: A defibrillator includes a display processing part for displaying an electrocardiogram waveform on a display part, a determination part for determining which mode is adopted an asynchronous mode for executing electric shock regardless of a timing for ORS wave in an electrocardiogram, or a synchronous mode for executing electric shock synchronously with the ORS wave, and a change part for changing a color of the electrocardiogram waveform displayed during the synchronous mode, into a color different from the color of the electrocardiogram waveform displayed during the asynchronous mode, based on a result of the determination.SELECTED DRAWING: Figure 3B

Description

Technical Field

[0001] The present invention relates to a defibrillator and a waveform display method.

Background Art

[0002] A defibrillator used in medical treatment is a device that gives an electric shock to a patient whose heart is in fibrillation to perform cardiopulmonary resuscitation (CPR). Patent Document 1 discloses a defibrillator provided with a display unit for displaying an electrocardiogram (ECG) waveform. The defibrillator disclosed in Patent Document 1 analyzes the waveform of the electrocardiogram detected by defibrillation pads attached to a patient, and displays the analysis result on the display unit as an electrocardiogram waveform.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Some defibrillators are equipped with a "synchronous electric shock function via synchronous mode" that eliminates supraventricular arrhythmias such as atrial fibrillation, atrial flutter, and supraventricular tachycardia by delivering an electric shock in sync with the QRS wave of the electrocardiogram. Hereafter, this function will be referred to as "synchronous mode." In synchronous mode, when a supraventricular arrhythmia occurs, an electric shock can be automatically delivered in sync with the QRS wave of the electrocardiogram. This avoids delivering an electric shock at the timing of the T wave of the electrocardiogram, thereby suppressing the induction of lethal arrhythmias in RonT. Some defibrillators also display a synchronous mark corresponding to the QRS wave on the electrocardiogram when in synchronous mode. By adding the synchronous mark, the operator can confirm that synchronous mode is set. Measures such as displaying an icon such as "synchronous" on the display unit to indicate that synchronous mode is set, or illuminating an LED (Light Emitting Diode) on the defibrillator when synchronous mode is set, may also be taken.

[0005] However, since defibrillators are activated with the synchronous mode deactivated, i.e., in asynchronous mode, there is a risk that the operator may forget to switch from asynchronous mode to synchronous mode and deliver an electric shock in asynchronous mode, even if the synchronous mark is associated with the QRS wave as described above, when setting to synchronous mode. Asynchronous mode is a mode in which an electric shock is delivered regardless of the timing of the QRS wave on the electrocardiogram when an electric shock is delivered manually. Thus, there is room for improvement in how to avoid forgetting to switch from asynchronous mode to synchronous mode and delivering an electric shock in asynchronous mode when eliminating supraventricular arrhythmias.

[0006] The object of the present invention is to provide a defibrillator and a waveform display method that can clearly indicate when the device has entered synchronous mode. [Means for solving the problem]

[0007] The defibrillator of the present invention comprises: a display processing unit that displays an electrocardiogram waveform in real time on a display unit; a determination unit that determines whether to use an asynchronous mode in which an electric shock is delivered regardless of the timing of the QRS wave of the electrocardiogram, or a synchronous mode in which an electric shock is delivered in synchronization with the QRS wave; and a modification unit that, based on the result of the determination, changes the color of the electrocardiogram waveform displayed in the synchronous mode to a color different from the color of the electrocardiogram waveform displayed in the asynchronous mode. The display processing unit divides the continuous electrocardiogram waveform into a first period corresponding to the asynchronous mode and a second period corresponding to the synchronous mode, and displays the electrocardiogram waveform corresponding to each period in a different color.

[0008] The waveform display method of the present invention is A waveform display method performed by a defibrillator, The steps include: displaying the electrocardiogram waveform on a display unit in real time; determining whether to use an asynchronous mode in which an electric shock is delivered regardless of the timing of the QRS wave of the electrocardiogram, or a synchronous mode in which an electric shock is delivered in synchronization with the QRS wave; and, based on the result of the determination, changing the color of the electrocardiogram waveform displayed in the synchronous mode to a different color from the color of the electrocardiogram waveform displayed in the asynchronous mode. The system has the following features, and in the step of displaying the continuous electrocardiogram waveform, the continuous electrocardiogram waveform is divided into a first period corresponding to the asynchronous mode and a second period corresponding to the synchronous mode, and the electrocardiogram waveforms corresponding to each period are displayed in different colors. [Effects of the Invention]

[0009] According to the present invention, it is possible to obtain a defibrillator and a waveform display method that can clearly indicate when the system has switched to synchronous mode. [Brief explanation of the drawing]

[0010] [Figure 1] External view of a defibrillator according to an embodiment of the present invention [Figure 2] Diagram showing an example of the hardware configuration of defibrillator 100. [Figure 3A] Diagram showing an example of the functional configuration of defibrillator 100 [Figure 3B] A diagram showing an example of the settings screen for defibrillator 100. [Figure 4] Flowchart for explaining the operation of defibrillator 100 [Figure 5] A diagram showing an example of an electrocardiogram waveform. [Modes for carrying out the invention]

[0011] Embodiments of the present invention will now be described in detail with reference to the drawings. Figure 1 is an external view of a defibrillator according to an embodiment of the present disclosure. The defibrillator 100 includes various operation buttons such as a charge button 1, a shock button 2, a setting dial 3, and a synchronization button 10, and a display unit 4. Although not shown, the defibrillator 100 also includes a battery, a boost circuit, a calculation circuit, a control circuit, etc. The various operation buttons constitute an input unit, which will be described later.

[0012] The charge button 1 is used to start charging the energy set in manual mode. The shock button 2 is used to deliver an electric shock using the defibrillation pads. The setting dial 3 is used to switch between pacing mode, monitor mode, AED (Automated External Defibrillator) mode, and to select the output energy value in manual mode.

[0013] The sync button 10 is a button that switches to asynchronous mode by disabling sync mode. In other words, the sync button 10 is a button for switching from asynchronous mode to sync mode. Synchronized mode is a mode in which, when an electric shock is administered manually, an electric shock is administered in sync with the QRS wave of the electrocardiogram. In sync mode, while the shock button is pressed and held down after the energy charge is complete, a synced electric shock is administered at the timing when a QRS wave is detected. Note that the defibrillator 100 is started with sync mode disabled, i.e., with asynchronous mode set, so it can be switched to sync mode by pressing the sync button 10. Asynchronous mode is a mode in which, when an electric shock is administered manually, an electric shock is administered regardless of the timing of the QRS wave of the electrocardiogram.

[0014] Next, a hardware configuration example of the defibrillator 100 will be described with reference to FIG. 2. FIG. 2 is a diagram showing a hardware configuration example of the defibrillator 100. The defibrillator 100 includes a display unit 4, a processor 5, a reception interface 6, a storage unit 7, and an input unit 8. The display unit 4, the processor 5, the reception interface 6, the storage unit 7, and the input unit 8 are connected to each other via a bus 9.

[0015] The reception interface 6 is an interface for connecting a defibrillation pad (not shown) that measures an electrocardiogram signal, for example, to the defibrillator 100.

[0016] The storage unit 7 is a hard disk drive, a semiconductor storage device, etc., and stores calculation results executed by the processor 5, programs related to functions to be executed by the processor 5, etc.

[0017] The input unit 8 is a user interface that receives operations by an operator, and includes a setting dial 3, various operation buttons, etc. The input unit 8 generates a signal for operating the defibrillator 100 according to the content of the operation to the input unit 8, and transmits it to the processor 5.

[0018] The display unit 4 has functions such as displaying various information such as an electrocardiogram waveform, and generating a signal corresponding to a touch operation by an operator and transmitting it to the processor 5.

[0019] The processor 5 realizes various functions related to the defibrillator 100 by executing a predetermined program.

[0020] Also, when the synchronization button 10 is pressed, the processor 5 causes the display unit 4 to display the character "synchronization" to notify the operator that the defibrillator 100 has shifted from the asynchronous mode to the synchronous mode.

[0021] Furthermore, when pacing mode is selected, processor 5 generates pacing pulses from the defibrillation pads. Pacing mode is a mode that operates the defibrillator 100 with the temporary transcutaneous pacing function. Temporary transcutaneous pacing is a function that allows the heart to beat normally by transmitting pacing pulses to the heart from defibrillation pads attached to the surface of the patient's body, and pacing modes include demand mode and fixed mode. Demand mode is a mode that outputs pacing pulses when the patient's own heart rate falls below the set pacing rate. Fixed mode is a mode that outputs pacing pulses at the set pacing rate regardless of the patient's own heart rate.

[0022] Furthermore, the processor 5 analyzes the electrocardiogram of the patient in fibrillation for a predetermined period of time to determine whether an electric shock is necessary. If it determines that defibrillation is necessary, it delivers a defibrillation electric shock to a defibrillation pad (not shown) at an appropriate time.

[0023] Here, the defibrillator 100 is activated in asynchronous mode to quickly eliminate life-threatening arrhythmias requiring immediate attention. Therefore, in clinical situations where it is necessary to switch to synchronous mode to eliminate supraventricular arrhythmias, there is a risk that the operator may forget to switch from asynchronous mode to synchronous mode and deliver an electric shock while still in asynchronous mode. Consequently, it is desirable to clearly indicate that the device has switched to synchronous mode when eliminating supraventricular arrhythmias.

[0024] In view of the above, the defibrillator 100 according to an embodiment of the present invention has the following functions. These functions will be specifically described with reference to Figures 3A and 3B.

[0025] Figure 3A shows an example of the functional configuration of the defibrillator 100, and Figure 3B shows an example of the settings screen for the defibrillator 100.

[0026] As shown in Figure 3A, the processor 5 includes a display processing unit 51, an analysis unit 52, a determination unit 53, a modification unit 54, and a setting unit 55.

[0027] The display processing unit 51 displays the electrocardiogram waveform measured from the patient on the display unit 4 in real time. When displaying the electrocardiogram waveform on the display unit 4, the display processing unit 51 displays the electrocardiogram waveform corresponding to the color set in the setting unit 55. Details of the setting unit 55 will be described later.

[0028] The analysis unit 52 analyzes the measured electrocardiogram (ECG) to determine whether defibrillation by electric shock is necessary, for example, when the AED mode is set. This analysis may take several seconds. If CPR is performed while the ECG is being analyzed, noise from chest compressions may be introduced into the ECG, making it impossible to analyze the ECG correctly. Therefore, CPR must be interrupted during ECG analysis, but clinically, the interruption time should be kept as short as possible to prevent cerebral ischemia and improve the resuscitation rate. Various guidelines on cardiac resuscitation recommend interrupting CPR for no more than 10 seconds.

[0029] The determination unit 53 determines whether the device has transitioned from an asynchronous mode, in which an electric shock is delivered regardless of the timing of the QRS wave in the electrocardiogram, to a synchronous mode, in which an electric shock is delivered in sync with the QRS wave. In other words, the determination unit determines whether the device is in asynchronous mode or synchronous mode. As mentioned above, the defibrillator 100 is started in asynchronous mode, but it can be switched to synchronous mode by pressing the synchronous button 10. When the determination unit 53 receives a signal indicating that the synchronous button 10 has been pressed, it determines that the device has transitioned from asynchronous mode to synchronous mode.

[0030] Furthermore, the determination unit 53 may be configured to determine that the synchronization mode has been canceled, for example, if the synchronization mode is canceled after transitioning to the synchronization mode and then the AED mode is set.

[0031] Based on the determination result by the determination unit 53, the modification unit 54 sends instruction information to the display processing unit 51 to change the color of the electrocardiogram waveform displayed in synchronous mode to a different color from the color of the electrocardiogram waveform displayed in asynchronous mode. Upon receiving the instruction information, the display processing unit 51 changes the color of the electrocardiogram waveform according to the instruction information. Details of the example of changing the color of the electrocardiogram waveform by the modification unit 54 will be described later.

[0032] The setting unit 55 displays a setting screen 41 (see Figure 3B) on the display unit 4 for setting the color of the electrocardiogram waveform, the brightness of the electrocardiogram waveform, and so on. To give a specific example of the setting screen 41, the setting unit 55 displays the setting screen 41 on the display unit 4 and further displays an area A1 on the setting screen 41 where multiple setting buttons for selecting the color of the electrocardiogram (ECG) waveform are arranged, an area A2 for setting the brightness of the electrocardiogram waveform, and so on.

[0033] The settings buttons in area A1 include buttons for setting the color of the electrocardiogram waveform, such as "Normal," "Synchronized," "AED," and "Pacing."

[0034] The "Normal" button sets the color of the electrocardiogram waveform when synchronization mode, AED mode, pacing mode, etc., are not set. It can also set the color of the electrocardiogram waveform displayed when asynchronous mode is set, and the color of the electrocardiogram waveform displayed after synchronization mode is deactivated.

[0035] The "Sync" button sets the color of the electrocardiogram waveform when sync mode is enabled.

[0036] The "AED" button sets the color of the electrocardiogram waveform when AED mode is selected. AED mode automatically performs electrocardiogram analysis, determines whether an electric shock is necessary, selects the energy value, and charges the energy, and then delivers the electric shock manually or automatically.

[0037] The "Pacing" button sets the color of the electrocardiogram waveform when pacing is initiated.

[0038] By pressing these setting buttons, the operator can select a color, such as green, yellow, white, or blue, that is set for the shock button 2, etc. The setting unit 55 sets the color selected by the operator as the color of the electrocardiogram waveform in each of the above modes.

[0039] Next, the operation of the defibrillator 100 will be explained with reference to Figures 4 and 5. Figure 4 is a flowchart illustrating the operation of the defibrillator 100, and Figure 5 is a diagram showing an example of an electrocardiogram waveform. In Figure 5, the horizontal direction represents time, and the vertical direction represents the amplitude of the electrocardiogram waveform.

[0040] Figure 5 shows the electrocardiogram waveform when transitioning from asynchronous mode to synchronous mode. Time t1 is the point at which the system transitions from asynchronous mode to synchronous mode when the sync button 10 is pressed, i.e., the point at which the system switches from asynchronous mode to synchronous mode. The period before time t1 is the period when the defibrillator 100 is powered on and the electrocardiogram waveform is measured in asynchronous mode, and the period after time t1 is the period when the electrocardiogram waveform is measured in synchronous mode. The arrows are sync marks displayed in correspondence with the QRS wave.

[0041] (Operation of Defibrillator 100) When the defibrillator 100 is activated and electrocardiogram measurement begins (step S1), an electrocardiogram waveform in a color corresponding to the asynchronous mode is displayed on the display unit 4 (step S2). This color is, for example, green.

[0042] Subsequently, it is determined whether or not the system has transitioned from asynchronous mode to synchronous mode (step S3). The process in step S3 is repeated until the system transitions to synchronous mode (step S3, NO). If the system transitions to synchronous mode (step S3, YES), the modification unit 54 changes the color of the electrocardiogram waveform to a color different from green (for example, yellow) (step S4).

[0043] If a QRS complex is subsequently detected (step S5), and the system transitions from asynchronous mode to synchronous mode, and then the synchronous mode is deactivated (step S6, YES), the modification unit 54 further changes the color of the electrocardiogram waveform, for example from yellow to green (step S7). In other words, if the system transitions from synchronous mode to asynchronous mode, the modification unit 54 returns the color of the electrocardiogram waveform to its original color. If the synchronous mode is not deactivated (step S6, NO), the process from step S4 onwards is repeated.

[0044] By changing the color of the electrocardiogram waveform in this way, the operator can be clearly informed that the defibrillator 100 is operating in synchronous mode. If the electrocardiogram waveform is green, the defibrillator 100 is operating in asynchronous mode. Therefore, in situations where it is necessary to set the defibrillator to eliminate supraventricular arrhythmias, the operator can easily recognize that the synchronous mode is not set, preventing the operator from forgetting to switch to synchronous mode and delivering an electric shock while the defibrillator is still in asynchronous mode.

[0045] Furthermore, if the synchronous mode is canceled after transitioning from asynchronous mode to synchronous mode, the modification unit 54 may further change the color of the electrocardiogram waveform, for example, from yellow to green. This clearly informs the operator that the synchronous mode has been canceled.

[0046] Furthermore, when transitioning from asynchronous mode to synchronous mode, the modification unit 54 may, in addition to changing the color, also change at least one of the brightness, thickness, or line type of the electrocardiogram waveform before and after the transition. This makes the difference in the electrocardiogram waveform before and after transitioning from asynchronous mode to synchronous mode clearer, making it even easier to understand that synchronous mode is not set.

[0047] Furthermore, it is understood that the following embodiments, for example, also fall within the technical scope of this disclosure.

[0048] (1) The defibrillator of the present disclosure includes a display processing unit that displays an electrocardiogram waveform on a display unit, a determination unit that determines whether to use an asynchronous mode in which an electric shock is delivered regardless of the timing of the QRS wave of the electrocardiogram, or a synchronous mode in which an electric shock is delivered in synchronization with the QRS wave, and a modification unit that, based on the result of the determination, changes the color of the electrocardiogram waveform displayed in the synchronous mode to a color different from the color of the electrocardiogram waveform displayed in the asynchronous mode.

[0049] (2) In addition to changing the color, the modified part changes at least one of the brightness, thickness, and line type of the electrocardiogram waveform.

[0050] (3) When the change unit transitions from the synchronous mode to the asynchronous mode, it returns the color of the electrocardiogram waveform to the color it was in before the change.

[0051] (4) The waveform display method of the present disclosure includes the step of displaying an electrocardiogram waveform on a display unit, The steps include determining whether to use an asynchronous mode in which an electric shock is delivered regardless of the timing of the QRS wave in the electrocardiogram, or a synchronous mode in which an electric shock is delivered in synchronization with the QRS wave, Based on the result of the determination, the step of changing the color of the electrocardiogram waveform displayed in the synchronous mode to a different color from the color of the electrocardiogram waveform displayed in the asynchronous mode, This is performed by a defibrillator equipped with a defibrillator.

[0052] The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of the present invention is indicated by the claims rather than the foregoing description and is intended to include all modifications within the meaning and scope of the claims, including equivalents.

[0053] Embodiments of the present invention have been described above. It should be noted that the above description illustrates preferred embodiments of the present invention, and the scope of the present invention is not limited thereto. In other words, the description of the configuration of the apparatus and the shape of each part is merely an example, and it is clear that various modifications and additions to these examples are possible within the scope of the present invention. [Explanation of symbols]

[0054] 1. Charging button 2 Shock Buttons 3. Setting dial 4 Display 5 processors 6. Receiving Interface 7 Memory section 8 Input section 9 buses 10 Sync button 41 Settings screen 51 Display Processing Unit 52 Analysis Department 53 Judgment section 54 Changes 55 Setting section 100 Defibrillator A1 area A2 area

Claims

1. A display processing unit that displays the electrocardiogram waveform in real time on the display unit, A determination unit that determines whether to use an asynchronous mode in which an electric shock is delivered regardless of the timing of the QRS wave in the electrocardiogram, or a synchronous mode in which an electric shock is delivered in synchronization with the QRS wave, Based on the result of the above determination, a modification unit changes the color of the electrocardiogram waveform displayed in the synchronous mode to a different color from the color of the electrocardiogram waveform displayed in the asynchronous mode, Equipped with, A defibrillator in which the display processing unit divides the continuous electrocardiogram waveform into a first period corresponding to the asynchronous mode and a second period corresponding to the synchronous mode, and displays the electrocardiogram waveform corresponding to each period in a different color.

2. The defibrillator according to claim 1, wherein the modified part changes at least one of the brightness, thickness, and line type of the electrocardiogram waveform in addition to changing the color.

3. The defibrillator according to claim 1 or 2, wherein the modification unit further changes the color of the electrocardiogram waveform when the synchronization mode is canceled.

4. The modification unit changes the display color of the electrocardiogram waveform and changes the display indicating whether it is in synchronous mode or asynchronous mode. The defibrillator according to claim 1.

5. A waveform display method performed by a defibrillator, The steps include displaying the electrocardiogram waveform on the display unit in real time, The steps include determining whether to use an asynchronous mode in which an electric shock is delivered regardless of the timing of the QRS wave in the electrocardiogram, or a synchronous mode in which an electric shock is delivered in synchronization with the QRS wave, The method includes the step of changing the color of the electrocardiogram waveform displayed in the synchronous mode to a different color from the color of the electrocardiogram waveform displayed in the asynchronous mode, based on the result of the determination, In the display step, the continuous electrocardiogram waveform is divided into a first period corresponding to the asynchronous mode and a second period corresponding to the synchronous mode, and the electrocardiogram waveforms corresponding to each period are displayed in different colors. Waveform display method.

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