Defibrillator

Abstract

To provide a defibrillator capable of clearly notifying a period corresponding to an operation mode.SOLUTION: The defibrillator includes a display processing section which displays an electrocardiographic waveform of a patient on a displaying section, a setting section which can individually set a color of the electrocardiographic waveform to be displayed on the displaying section corresponding to a plurality of operation modes, and a changing section which sets a period set to a first mode included in the plurality of operation modes as a first period, sets a period set to a second mode included in the plurality of operation modes as a second period, and sets the color of the electrocardiographic waveform displayed during the first period and the color of the electrocardiographic waveform displayed during the second period to different colors.SELECTED DRAWING: Figure 3A

Description

[Technical Field]

[0001] The present invention relates to defibrillators. [Background technology]

[0002] Defibrillators used in medical care are devices that administer electric shocks to patients whose hearts are in fibrillation to perform cardiac resuscitation (CPR: Cardio Pulmonary Resuscitation). Patent Document 1 discloses a defibrillator equipped with a display unit that displays electrocardiogram (ECG) waveforms. The defibrillator disclosed in Patent Document 1 analyzes electrocardiogram waveforms detected by defibrillation pads attached to the patient and displays the analysis results as electrocardiogram waveforms on the display unit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-181111 Summary of the Invention [Problem to be solved by the invention]

[0004] Here, if the patient's heart goes into fibrillation, the defibrillator analyzes the electrocardiogram for a predetermined period of time and then determines whether an electric shock, i.e., defibrillation, is necessary. If it determines that defibrillation is necessary, it is configured to administer an electric shock at the appropriate time.

[0005] It takes a certain period of time to determine whether defibrillation is necessary, but if chest compressions are performed for CPR while an electrocardiogram is being analyzed, noise from the chest compressions may be mixed into the electrocardiogram, making it difficult to accurately determine whether defibrillation is necessary. Meanwhile, from the perspective of preventing cerebral ischemia and improving the resuscitation rate, it is desirable to minimize the time that chest compressions are interrupted. In light of these factors, the conventional defibrillator disclosed in Patent Document 1 may be equipped with a function to play audio guidance indicating that touching the patient is prohibited during periods such as during electrocardiogram analysis.

[0006] However, if the defibrillator operator is concentrating on chest compressions or if there is a lot of ambient noise, the operator may not notice the voice guidance, and chest compressions may be performed during a period when touching the patient is prohibited. Therefore, there remains a problem of how to inform the operator of the period when touching the patient is prohibited even in such a situation.

[0007] An object of the present invention is to provide a defibrillator that can clearly indicate the period corresponding to the operating mode. [Means for solving the problem]

[0008] The defibrillator according to the present invention comprises: a display processing unit that displays the electrocardiogram waveform of the patient on a display unit; a setting unit that can individually set the color of the electrocardiogram waveform to be displayed on the display unit in accordance with a plurality of operation modes; The device is provided with a change unit that defines a period set to a first mode included in the plurality of operation modes as a first period, defines a period set to a second mode included in the plurality of operation modes as a second period, and changes the color of the electrocardiogram waveform displayed during the first period to a different color from the color of the electrocardiogram waveform displayed during the second period. [Effects of the Invention]

[0009] According to the present invention, it is possible to obtain a defibrillator that can clearly indicate the period corresponding to the operation mode. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is an external view of a defibrillator according to an embodiment of the present invention; [Figure 2] FIG. 1 is a diagram showing an example of the hardware configuration of a defibrillator 100. [Figure 3A] FIG. 1 is a diagram showing an example of the functional configuration of a defibrillator 100. [Figure 3B] FIG. 10 is a diagram showing an example of a setting screen of the defibrillator 100. [Figure 4] 1 is a flowchart illustrating the operation of the defibrillator 100. [Figure 5A] A diagram showing an example of an electrocardiogram waveform [Figure 5B] A diagram showing an example of an electrocardiogram waveform [Figure 5C] A diagram showing an example of an electrocardiogram waveform DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 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, as well as a display unit 4. Although not shown, the defibrillator 100 also includes a battery, a boost circuit, an arithmetic circuit, a control circuit, and the like. The various operation buttons form an input unit, which will be described later.

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

[0013] The synchronization button 10 is a button for switching from the synchronization mode to the asynchronous mode. That is, the synchronization button 10 is a button for switching from the asynchronous mode to the synchronization mode. The synchronization mode is a mode in which an electric shock is delivered in synchronization with the QRS wave of the electrocardiogram when an electric shock is manually administered. In the synchronization mode, an electric shock is delivered synchronously with the detection of a QRS wave while the shock button is pressed and held down after energy charging is complete. Note that when the defibrillator 100 is started, the synchronization mode is canceled, i.e., the asynchronous mode is set, and the defibrillator 100 can be switched to the synchronization mode by pressing the synchronization button 10. The asynchronous mode is a mode in which an electric shock is delivered in a manual manner regardless of the timing of the QRS wave of the electrocardiogram.

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

[0015] The receiving interface 6 is an interface that connects, for example, defibrillator pads (not shown) that measure electrocardiogram signals to the defibrillator 100 .

[0016] The storage unit 7 is a hard disk drive, a semiconductor storage device, or the like, and stores the results of calculations performed by the processor 5, programs relating to functions to be executed by the processor 5, and the like.

[0017] The input unit 8 is a user interface that accepts operations by an operator and includes a setting dial 3, various operation buttons, etc. The input unit 8 generates a signal to operate the defibrillator 100 in accordance with the content of the operation on the input unit 8 and transmits it to the processor 5.

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

[0019] The processor 5 executes a predetermined program to realize various functions related to the defibrillator 100.

[0020] Furthermore, when the synchronization button 10 is pressed, the processor 5 displays the word "synchronization" on the display unit 4, thereby notifying the operator that the mode has been changed from the asynchronous mode to the synchronous mode.

[0021] The processor 5 also generates pacing pulses from the defibrillation pads when a pacing mode is selected. The pacing mode is a mode in which the defibrillator 100 operates with a temporary transcutaneous pacing function. Temporary transcutaneous pacing is a function that transmits pacing pulses to the heart from defibrillation pads attached to the patient's body surface to allow the heart to beat normally. Pacing modes include demand mode and fixed mode. Demand mode is a mode in which pacing pulses are output when the rate of the patient's intrinsic heartbeat falls below the set pacing rate. Fixed mode is a mode in which pacing pulses are output at the set pacing rate regardless of the rate of the patient's intrinsic heartbeat.

[0022] The processor 5 also analyzes the electrocardiogram of a patient in a fibrillation state for a predetermined period of time to determine whether an electric shock is necessary, and if it determines that defibrillation is necessary, it generates a defibrillation electric shock at an appropriate timing on a defibrillation pad (not shown).

[0023] As mentioned above, determining whether or not an electric shock is necessary requires a certain period of time, but if chest compressions are performed for cardiac resuscitation while the electrocardiogram is being analyzed, noise from the chest compressions may be mixed into the electrocardiogram, making it difficult to accurately determine whether or not an electric shock, i.e., defibrillation, is necessary. On the other hand, from the perspective of preventing cerebral ischemia and improving the resuscitation rate, it is desirable to minimize the time that chest compressions are interrupted.

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

[0025] FIG. 3A is a diagram showing an example of the functional configuration of the defibrillator 100, and FIG. 3B is a diagram showing an example of a setting screen of the defibrillator 100. As shown in FIG.

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

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

[0028] For example, when the AED mode is set, the analysis unit 52 analyzes the measured electrocardiogram to determine whether or not defibrillation by electric shock is necessary. This analysis may take several seconds. If CPR is performed while an electrocardiogram is being analyzed, noise from chest compressions may be introduced into the electrocardiogram, preventing accurate analysis. Therefore, CPR must be interrupted during electrocardiogram analysis. However, clinical practice requires that CPR be interrupted as quickly as possible to prevent cerebral ischemia and improve resuscitation rates. Various cardiac resuscitation guidelines recommend interrupting CPR for no more than 10 seconds.

[0029] The determination unit 53 determines whether or not an electric shock is required to be administered to the patient based on the results of the electrocardiogram analysis by the analysis unit 52. Note that the method for determining whether or not an electric shock is required is well known, and therefore a description thereof will be omitted.

[0030] Based on the result of the determination by the determination unit 53, the change unit 54 transmits instruction information to the display processing unit 51 to change the color of the electrocardiogram waveform displayed during a first period during which touching of the patient is prohibited to a color different from the color of the electrocardiogram waveform displayed during a second period other than the first period. Upon receiving the instruction information, the display processing unit 51 changes the color of the electrocardiogram waveform in accordance with the instruction information. An example of changing the color of the electrocardiogram waveform by the change unit 54 will be described in detail later.

[0031] The setting unit 55 displays a setting screen 41 (see FIG. 3B) for setting the color, brightness, etc. of the electrocardiogram waveform on the display unit 4. To explain 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 on the setting screen 41 an area A1 in which a plurality of setting buttons for selecting the color of the electrocardiogram (ECG) waveform are arranged, an area A2 for setting the brightness of the electrocardiogram waveform, etc.

[0032] The setting buttons in area A1 include buttons for setting the color of the electrocardiogram waveform corresponding to, for example, "normal," "synchronized," "AED," "pacing," and the like.

[0033] "Normal" is a button that sets the color of the electrocardiogram waveform when synchronous mode, AED mode, pacing mode, etc. are not set, and can also be used to set the color of the electrocardiogram waveform displayed when asynchronous mode is set, and the color of the electrocardiogram waveform displayed after synchronous mode is released.

[0034] "Sync" is a button that sets the color of the ECG waveform when synchronization mode is set. "AED" is a button that sets the color of the ECG waveform when AED mode is set. AED mode automatically analyzes the ECG, determines whether or not an electric shock is necessary, selects the energy value, and even charges the energy, and then administers the electric shock manually or automatically.

[0035] "Pacing" is a button for setting the color of the electrocardiogram waveform when pacing starts.

[0036] By pressing these setting buttons, the operator can select the color set for the shock button 2, etc., such as green, yellow, white, blue, 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.

[0037] Next, the operation of defibrillator 100 will be described with reference to Figures 4, 5A, 5B, and 5C. Figure 4 is a flowchart illustrating the operation of defibrillator 100, and each of Figures 5A to 5C shows an example of an electrocardiogram waveform. In each of Figures 5A to 5C, the horizontal direction represents time, and the vertical direction represents the amplitude of the electrocardiogram waveform.

[0038] (If a shock is administered) FIG. 5A shows an electrocardiogram waveform when an electric shock is administered after it has been determined that an electric shock is necessary.

[0039] Time t1 is the time point when electrocardiogram analysis starts. The period before time t1 is, for example, the period from when power is turned on to defibrillator 100 until electrocardiogram analysis starts, and is also the second period P2 during which contact with the patient is permitted.

[0040] After time t1, the need for an electric shock is determined based on the results of electrocardiogram analysis. This period is also the first period P1 during which the patient must not be touched, to avoid noise, for example, from chest compressions being mixed into the electrocardiogram, making it impossible to accurately determine the need for defibrillation (i.e., the need for an electric shock).

[0041] Time t2 is the time when it is determined that an electric shock is necessary (electric shock application). At time t3, a certain period of time after time t2, an electric shock is administered for defibrillation.

[0042] The period from time t2 to time t3 is also a first period P1 during which touching the patient is prohibited. The period from time t3 onwards, when the electric shock is administered, is also a second period P2 during which touching the patient is permitted for CPR or the like.

[0043] (If canceled after applying an electric shock) FIG. 5B shows an electrocardiogram waveform in the event of a change in electrocardiogram rhythm that cancels the application of an electric shock after the shock has been administered.

[0044] Specifically, Figure 5B shows an electrocardiogram waveform in the case where, after a certain time has elapsed from the time when it was determined that an electric shock should be administered (time t2), no fibrillation waves are detected and the electrocardiogram waveform becomes flat, so it is determined that an electric shock is unnecessary and the electric shock is canceled.

[0045] (If it is determined that an electric shock is not necessary) 5C shows an electrocardiogram waveform when it is determined that a shock is not necessary. Time t2' is the time when it is determined that a shock is not necessary, and the period from time t2' onwards is a second period P2 during which the patient can be touched.

[0046] (Operation of Defibrillator 100) When the defibrillator 100 is activated and starts measuring an electrocardiogram (step S1), an electrocardiogram waveform in a first color indicating a second period P2 during which the patient can be touched is displayed on the display unit 4. In this case, the first color is, for example, green.

[0047] Next, when electrocardiogram analysis is started in step S2, the change unit 54 changes the color of the electrocardiogram waveform to a second color different from the first color (step S3). That is, the change unit 54 changes the color of the electrocardiogram waveform to a color different from the color of the electrocardiogram waveform displayed before the start of electrocardiogram analysis (time t1). The second color is, for example, yellow.

[0048] Thereafter, at time t2, it is determined based on the analysis results whether or not to administer an electric shock to the patient (step S4).

[0049] If it is determined that an electric shock should be administered (step S4, YES), then in step S5 the change unit 54 determines whether or not there is a change in the electrocardiogram rhythm that would cause the administration of an electric shock to be canceled between time t2 and the time the electric shock is administered.

[0050] If the application of the electric shock is continued (step S5, YES), the electric shock is administered at time t3 (step S6) as shown in Fig. 5A. Thereafter, the change unit 54 changes the color of the electrocardiogram waveform back from the second color to the first color (step S7).

[0051] As shown in FIG. 5B, even if the application of the electric shock is not continued at time t3', i.e., if the application of the electric shock is canceled (step S5, NO), the change unit 54 changes the color of the electrocardiogram waveform back from the second color to the first color (step S7).

[0052] As shown in FIG. 5C, even if it is determined at time t2' that an electric shock is not required (step S4, NO), the change unit 54 changes the color of the electrocardiogram waveform back from the second color to the first color (step S7).

[0053] In this way, by changing the color of the electrocardiogram waveform from the first color to the second color, the operator can recognize periods during which they should not touch the patient, i.e., periods during which chest compressions, etc. should be suspended.

[0054] Furthermore, by changing the color of the electrocardiogram waveform back from the second color to the first color, an operator who sees the first color can recognize that this is the second period P2 in which they can touch the patient, and can take measures such as resuming CPR.

[0055] As a method for notifying the operator of the period during which touching the patient is prohibited, for example, a predetermined voice guidance may be played back.

[0056] However, even when a voice guidance such as "Do not touch the patient. The ECG is being analyzed" is played, it is difficult for the defibrillator operator to notice if they are concentrating on chest compressions or in a noisy environment. This can lead to the operator mistaking the first period P1 for the second period P2, during which they can touch the patient, and potentially performing CPR. Furthermore, the operator may mistake the second period P2 for the first period P1, during which they must not touch the patient, potentially delaying the resumption of CPR.

[0057] In contrast, the defibrillator 100 according to the embodiment of the present invention uses different colors for the ECG waveform between the second period P2 and the first period P1, allowing the user to determine whether the analysis is in progress or whether CPR is possible. This improves the accuracy of defibrillation determination and increases the patient's resuscitation rate. Furthermore, if only the audio guide is displayed without changing the color, it is difficult to determine the point in the displayed ECG waveform when ECG analysis began. However, by using different colors for the ECG waveform, the user can easily determine whether a shock application was incorrectly determined due to CPR continued during ECG analysis by checking the displayed ECG. For example, by checking the ECG waveform that has turned yellow, the user can determine whether CPR noise is present in the ECG.

[0058] The electrocardiogram waveforms can be stored in chronological order as history waveforms in the storage unit 7. Therefore, even when the electrocardiogram waveforms stored in the storage unit 7 are played back, the colors of the electrocardiogram waveforms are different for the analysis period and the CPR possible period, greatly improving visibility. Therefore, it is possible to easily understand whether the electrocardiogram was analyzed appropriately during the analysis period, and whether appropriate resuscitation measures were taken during the CPR possible period.

[0059] It should be noted that, for example, the following aspects are also understood to fall within the technical scope of the present invention.

[0060] (1) A defibrillator according to an embodiment of the present invention includes a display processing unit that displays an electrocardiogram waveform on a display unit, an analysis unit that analyzes the electrocardiogram, a judgment unit that determines whether or not an electric shock is required for the patient based on the results of the analysis, and a change unit that changes the color of the electrocardiogram waveform displayed during a first period during which the patient should not be touched to a color different from the color of the electrocardiogram waveform displayed during a second period other than the first period based on the results of the judgment.

[0061] (2) The change unit changes the color of the electrocardiogram waveform displayed during the first period, which is defined as the first period from the time the analysis is started to the time the electric shock is delivered.

[0062] (3) The change unit defines the period from the time the analysis is started to the time the application of the electric shock is canceled as the first period, and changes the color of the electrocardiogram waveform displayed during the first period.

[0063] (4) The change unit defines the period from the time the analysis is started to the time the judgment unit judges that the electric shock is unnecessary as the first period, and changes the color of the electrocardiogram waveform displayed during the first period.

[0064] (5) A waveform display method according to an embodiment of the present invention is performed by a defibrillator having the steps of: displaying an electrocardiogram waveform on a display unit; analyzing the electrocardiogram; determining whether or not an electric shock is required for the patient based on the results of the analysis; and changing the color of the electrocardiogram waveform displayed during a first period during which the patient should not be touched to a color different from the color of the electrocardiogram waveform displayed during a second period other than the first period based on the results of the determination.

[0065] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims, such as equivalents thereof.

[0066] The embodiments of the present invention have been described above. Note that the above description is an example of a preferred embodiment of the present invention, and the scope of the present invention is not limited to this. In other words, the description of the configuration of the above device and the shape of each part is one 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]

[0067] 1 Charge button 2 Shock Button 3 Setting dial 4 Display 5 processors 6 Receiving Interface 7 Memory section 8 Input section 9 Bus 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 P1 1st period P2 2nd period

Claims

1. a display processing unit that displays the electrocardiogram waveform of the patient on a display unit; a setting unit that can individually set the color of the electrocardiogram waveform to be displayed on the display unit in accordance with a plurality of operation modes; a change unit that defines a period in which a first mode included in the plurality of operation modes is set as a first period, defines a period in which a second mode included in the plurality of operation modes is set as a second period, and changes the color of the electrocardiogram waveform displayed during the first period to a color different from the color of the electrocardiogram waveform displayed during the second period; A defibrillator comprising:

2. The second period is continuous with the first period.

10. The defibrillator of claim 1.

3. the second mode is continuous with the first mode; 10. The defibrillator of claim 1.

4. the first period is a period during which the patient should not be touched; the second period of time is a period of time during which the patient can be touched; 4. A defibrillator according to claim 2 or 3.

5. An analysis unit that analyzes an electrocardiogram is provided, The first period is a period starting from the time when the analysis is started.

5. The defibrillator of claim 4.

6. a determination unit that determines whether or not an electric shock is required based on the results of the analysis; The first period is a period up to a point in time determined based on the result of the determination.

6. The defibrillator of claim 5.

7. the change unit sets a display color of the electrocardiogram waveform displayed during the second period to a first color, sets a display color of the electrocardiogram waveform displayed during the first period to a second color, and changes the display color of the electrocardiogram waveform when switching from the second period to the first period and when switching from the first period to the second period.

7. The defibrillator of claim 6.

8. the change unit changes the color of the electrocardiogram waveform during a period from when the analysis is started to when the electric shock is delivered, the period being defined as a first period.

8. The defibrillator of claim 7.

9. the change unit changes the color of the electrocardiogram waveform during a period from when the analysis is started to when the application of the electric shock is canceled, the period being defined as the first period.

8. The defibrillator of claim 7.

10. the change unit changes the color of the electrocardiogram waveform during a period from when the analysis is started to when the determination unit determines that the electric shock is unnecessary, as the first period.

8. The defibrillator of claim 7.

11. the display processing unit starts displaying the electrocardiogram waveform in the first color when measurement of the electrocardiogram waveform starts; the change unit changes the color of the electrocardiogram waveform from the first color to the second color when the first period starts, and then changes the color of the electrocardiogram waveform from the second color to the first color when the first period ends.

8. The defibrillator of claim 7.

12. Further comprising a storage unit, the storage unit stores the electrocardiogram waveforms in chronological order as historical waveforms; 10. The defibrillator of claim 1.

Images