JP4416249B2 - Real time pulsation monitor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a real-time pulsation monitor that displays a fluctuation distribution of pulsations in real time based on biological signals such as an electrocardiogram waveform and a pulse.
[0002]
[Prior art]
The heart rate monitor that measures the heart rate and pulse rate of the living body from the electrocardiogram waveform and photoelectric pulse wave and displays the instantaneous heart rate and its trend graph as a method for the subject to check his / her heart condition in real time Existed. For example, Japanese Patent Application Laid-Open No. 5-154117 discloses an example relating to display of an instantaneous heartbeat and a trend graph.
[0003]
Japanese Patent Application Laid-Open No. 7-155303 discloses a technique for obtaining a heartbeat interval variation from an electrocardiogram and comparing it with a normal average value so that an autonomic nervous function can be examined in real time.
[0004]
In JP-A-7-155303, collection of electrocardiograms is divided into a rest time and a load time, and an RR trend graph for displaying each heartbeat interval as a display method, an RR histogram for displaying the heartbeat interval, and frequency analysis (power spectrum). It is shown that the autonomic nervous function is examined by a display method such as).
[0005]
On the other hand, as an evaluation method of the sympathetic and cardiac vagus nerve enhancement states, in the two adjacent RR intervals of the heartbeat, the first RR interval is the horizontal coordinate and the next RR interval is the vertical coordinate In recent years, the method of repetitively processing consecutive RR intervals (Poincare plot: Therapeutic Research Vol.17 No.1 1996 “Heartbeat fluctuations and autonomic nerves” on page 216) has been highlighted. Is coming. FIG. 4 illustrates a Poincare plotting method of heart rate RR intervals. When an electrocardiographic waveform as shown in FIG. 4 is collected, the position of the R wave is identified. The R wave is the part where the peak can be clearly seen in the electrocardiogram waveform, and this interval is the heartbeat interval (RR interval). In FIG. 4, the positions are R1, R2, R3, and R4. When the time from R1 to R2 is T21, the time from R2 to R3 is T32, and the time from R3 to R4 is T43, as shown in the two-dimensional graph of FIG. Is plotted at a point where the value of T is T21. Subsequently, the horizontal axis is plotted at T43 and the vertical axis is plotted at T32. If this process is performed for data of continuous RR intervals, the fluctuation of the heart rate interval is plotted on a two-dimensional graph. If the heartbeat interval is not constant, the plot area on the graph is expanded, and when the heartbeat interval approaches constant, the plot area on the graph is narrowed.
[0006]
Further, in the Poincare plot, as shown in FIGS. 6A to 6C, it is possible to suggest the heart state by the pattern of the plot. FIG. 6a is typical data of a normal person and has a comet-like shape. FIG. 6 b shows data of a patient with heart failure, and the fluctuation component is smaller than that in FIG. Although FIG. 6c is also data of a heart failure patient, the plot pattern is complicated by data in which many arrhythmias appear. (See Therapeutic Research Vol.17 No.1 1996 “Heartbeat fluctuations and autonomic nerves” on page 216)
[0007]
[Problems to be solved by the invention]
However, the conventional Poincare plot drawing as described above is generally performed by obtaining and plotting the RR interval, which is the interval between the R peak values, from the electrocardiogram data of the measurement subject for a predetermined time (usually 24 hours). The result display after the time measurement was not obtained.
Further, even when the heartbeat data disclosed in Japanese Patent Laid-Open No. 7-155303 is subjected to frequency analysis and the heart state is determined from the result, general Fourier transform or the like is performed after collecting all waveform data. Since data is cut out using an appropriate window function, etc., conversion is performed, so it is not possible to obtain analysis results in real time. Even with other frequency analysis methods, the processing procedure is complicated and the analysis results are assumed in real time. Even if it is obtained, complicated processing must be performed at high speed, which may result in an expensive system.
[0008]
On the other hand, in the RR interval trend graph disclosed in Japanese Patent Laid-Open No. 5-154117 and the like, it is easy to grasp the temporal fluctuation of the heart rate, but the fluctuation of the heartbeat fluctuation that suggests the state of the heart is Poincare. It is not as intuitive as the plot method.
In the case of the normal comet pattern in the Poincare plot described above, the fluctuation component decreases as the heart rate increases (when the RR interval decreases), and the fluctuation component increases as the heart rate decreases (when the RR interval increases). Such a tendency cannot be expressed intuitively in the histogram display (result display) of the RR interval.
[0009]
In view of such a problem, the present invention discloses a display process of a Poincare plot in real time, and enables the measurement subject to grasp the state of the heart from the fluctuation component of the beat on the spot. It is.
[0010]
[Means for Solving the Problems]
Therefore, what achieves the above-described object is that a pulsation detecting unit for detecting the pulsation of the person to be measured, a pulsation interval detecting unit for measuring the pulsation interval for each beat from the output of the pulsation detecting unit, A pulsation interval storage unit that stores at least the immediately preceding pulsation interval data from the pulsation interval detection unit, a display unit that can display a two-dimensional graph, and data of the pulsation interval storage unit are stored in a two-dimensional graph. A control unit for sending a plot command to the display unit at a point having the value in one axial direction and the latest data of the pulsation interval detection unit as the value of the other axis of the two-dimensional graph. A real-time pulsation monitor that sequentially plots the pulsation signal in the two-dimensional graph area of the display unit each time a pulsation signal is detected, the pulsation interval detection unit having a time measuring function for detecting a heartbeat interval. The threshold value of the signal from the pulsation detection unit was detected and exceeded the threshold value Time point is stored with the regimen time function, then again time interval exceeding the threshold value after below the threshold value and outputs to the moving distance storing unit beats as the heart beat interval, When there is a change from a state in which there is no output from the pulsation detection unit for a certain period of time to a state in which the pulsation is detected, the two-dimensional graph area in the display unit is initialized, and the pulsation interval is plotted for a certain period of time. Stop beat interval plot later This is a real-time pulsation monitor. In addition, a pulsation detection unit that detects the pulsation of the person to be measured, a pulsation interval detection unit that measures the pulsation interval for each beat from the output of the pulsation detection unit, and the pulsation interval detection unit A pulse interval storage unit for storing at least the immediately preceding pulse interval data, a display unit capable of displaying a two-dimensional graph, and the data of the pulse interval storage unit as a value in one axial direction of the two-dimensional graph, A control unit that sends a plot command to the display unit at a point where the latest data of the pulsation interval detection unit is the value of the other axis of the two-dimensional graph, and detects a pulsation signal from the measurement subject A real-time pulsation monitor that sequentially plots in the two-dimensional graph area of the display unit each time, the pulsation interval detection unit having a time counting function for detecting a heartbeat interval, Detects the signal threshold and uses the time counting function when the threshold is exceeded. Stored, the time interval exceeds the threshold value again after the next falls below the threshold value and outputs to the moving distance storing unit beats as the heart beat interval, When there is a change from a state in which there is no output from the pulsation detection unit for a certain period of time to a state in which pulsation is detected, the two-dimensional graph area in the display unit is initialized, and a certain number of pulsation interval plots are performed. Stop pulsation plot after pulsation interval plot of This is a real-time pulsation monitor.
[0012]
The pulsation detecting means is preferably means for detecting the heartbeat of the person being measured.
[0013]
Moreover, it is preferable that the said pulsation detection means is a means to detect a to-be-measured person's pulse.
[0014]
Preferably, the pulsation detecting means specifically detects an R wave of an electrocardiographic waveform and uses the R wave peak as a heartbeat signal.
[0015]
In the real-time pulsation monitor, a measurement start switch is provided, a two-dimensional graph area in the display means is initialized based on the switch operation information, a heartbeat interval is plotted for a certain time, It is preferable to stop plotting.
[0016]
In the real-time pulsation monitor, a measurement start switch is provided, a two-dimensional graph area in the display means is initialized based on the switch operation information, a fixed number of beat interval plots are performed, and a fixed number of beats It is preferable to stop the pulsation plot after the interval plot.
Further, in the real-time pulsation monitor, when the state is changed from a state where there is no output from the pulsation detecting means for a certain time to a state where the pulsation is detected, the two-dimensional graph area in the display means is initialized, It is preferable to plot the movement interval and stop the pulsation interval plot after a certain time has elapsed.
[0017]
Further, in the real-time pulsation monitor, when the state is changed from the state in which there is no output from the pulsation detecting means for a certain time to the state in which the pulsation is detected, the two-dimensional graph area in the display means is initialized, and a certain number of It is preferable to perform a beat interval plot and stop the beat plot after a fixed number of beat interval plots.
[0018]
Preferably, the pulse interval storage means of the real-time beat monitor stores a certain number of the latest beat interval data and plots it on the display means based on the beat interval data of the storage means.
[0019]
In the real-time pulsation monitor, the pulsation interval storage means has a ring memory structure, erases the pulsation interval plot data plotted on the display means based on the oldest stored pulsation interval data, It is preferable to store the latest pulsation interval data.
[0020]
The display means of the real-time pulsation monitor uses a display device capable of gradation display or color display, and includes an array storage means for plotting the pulsation interval, and the control means is a two-dimensional display means. Instead of sequentially plotting in the graph area, it is preferable to display on the display means by changing the gradation or color of the display means based on the number of corresponding areas in the array storage means.
[0021]
In the real-time pulsation monitor, there is provided a screen storage means for storing at least one display content of the display means plotted and a calling means for operating when calling a past plot screen, and the past when the calling means is operated. It is preferable that the screen information is reproduced and displayed on the display means.
[0022]
In the real-time heart rate monitor, the state of the display means plotted and the time information mainly displayed are stored in the screen storage means, and the time information stored simultaneously with the two-dimensional graph plot is also displayed when the call button is pressed. It is preferable.
In the real-time pulsation monitor, when the plot display is the same point, the plot point is preferably blinked.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the drawings.
[0024]
FIG. 1 is a diagram showing the configuration of a real-time pulsation monitor according to an embodiment of the present invention. In this embodiment, a pulsation monitor in which pulsation detection is detected at heartbeat intervals based on the electrocardiographic waveform of the measurement subject will be described. 310 in the measured figure is an electrode part, and it contacts a to-be-measured person 100 directly, and detects a biosignal (electrocardiogram waveform). It is assumed that it is composed of electrode materials such as conventional electrocardiographs such as silver, silver chloride and carbon.
[0025]
When an operation signal of the start switch 380 is input to the control unit 350, measurement is started. Since the biological signal detected by the biological electrode 310 is weak to analyze, it is amplified by the amplifier 320 and sent to the pulsation detector 330. The pulsation detection unit 330 includes a digital filter or the like, and performs appropriate bandpass processing for detecting an RR interval, which is a heartbeat interval, along with removal of noise and a baseline fluctuation component of a waveform. The signal processed by the pulsation detection unit 330 is then sent to the pulsation interval detection unit 340. The pulsation interval detection unit 340 has a timekeeping function for detecting the heartbeat interval, detects a threshold value of the signal from the pulsation detection unit 330, and uses the timekeeping function to determine the time when the threshold value is exceeded. Then, the time interval that has fallen below the threshold and then exceeded the threshold again is output to the control unit 350 as a heartbeat interval (RR interval; pulsation interval).
[0026]
FIG. 2 shows an example of data processing for outputting the waveform output from the amplifier 320 as heartbeat interval data to the control unit. In FIG. 2, reference numeral 410 denotes an electrocardiographic waveform output from the amplifier 320, and in many cases, baseline fluctuations and high-frequency noise are superimposed. Basically, baseline fluctuations pass through a high-pass filter, and high-frequency noise passes through a low-pass filter, resulting in a signal from which noise components such as 420 are removed. Further, this signal is converted into a waveform of 430 by passing through a band pass filter centered around 17 Hz. A threshold is set for the waveform 430 (level indicated by a wavy line in the figure), and the time (msec unit) when the threshold is exceeded is stored (t1 in the figure). This part is the R peak value. After that, the time at which the threshold value was exceeded and the threshold value was exceeded again was memorized (t2 in the figure), and the interval between these two times (t2-t1) was the heart rate interval (RR interval) Output as. At this time, the data of t1 becomes unnecessary, and may be cleared from the stored information. Next, the time at which the threshold value was exceeded after being below the threshold value is stored again (t3 in the figure), and the interval (t3-t2) from time t2 at which the threshold value was previously exceeded is output as the next heartbeat interval.
Output the heart rate interval data from the signals sequentially obtained from the amplifier in this way.
Is possible. In the present embodiment, the filter portion for heart rate detection and heart rate interval detection is shown as a digital circuit. However, the same result can be obtained even if a signal processing algorithm is programmed and processed as software using a microcomputer or the like. It is also possible to configure some functions as a circuit and control the remaining parts by software.
[0027]
Heartbeat interval data detected by the beat interval detector 340 is sequentially sent to the controller 350.
[0028]
When the heart rate interval data is sent for the first time after the measurement is started, the control unit 350 stores the sent heart rate interval data in the storage unit 360, and the next heart rate interval data is stored in the pulse interval detection unit. Wait until it is sent from 340. Next, when the heart rate interval data is sent, the control unit 350 reads the previous heart rate interval data stored in the storage unit 360, the previous heart rate interval data as the vertical axis, and the new heart rate interval data. Are plotted at corresponding points on the display unit 370 as values on the horizontal axis, and new heartbeat interval data is stored in the storage unit 360.
[0029]
FIG. 3 shows an example of the display unit 370. In FIG. 3, a monochrome dot matrix liquid crystal is taken as an example. The number of dots on the liquid crystal is 256 × vertical 256 dots, the upper left is the origin of the liquid crystal display (0,0), the upper right is (255,0), the lower left is (0,255), the lower right is (255,255) And
[0030]
It is assumed that the graph axis for Poincare plot is displayed in advance on the liquid crystal, the origin of the Poincare plot graph is (50, 200), and the vertical axis is linearly from (50, 200) to (50, 20). It is assumed that the horizontal axis is plotted linearly from (50,200) to (230,200).
[0031]
The Poincare plot graph can display heartbeat intervals from 200 msec to 2000 msec on both the vertical and horizontal axes. In the horizontal axis direction, the liquid crystal coordinates 50 correspond to 200 msec and 230 corresponds to 2000 msec. In the vertical axis direction, the liquid crystal coordinates 200 correspond to 200 msec, and 20 corresponds to 2000 msec. In addition, one dot of liquid crystal on both the vertical and horizontal axes has a resolution of 10 msec of the heartbeat interval.
[0032]
When the new heartbeat interval data is Xmsec and the previous heartbeat interval data is Ymsec, a process of plotting on (30 + X / 10, 220−Y / 10) dots of the liquid crystal is performed. For example, when the new heart beat interval is 850 msec and the previous heart beat interval data is 920 msec, the plot may be made at (115, 128) points on the liquid crystal.
[0033]
The control unit 350 may perform a series of plot processing each time new data is sent from the pulsation interval detection unit 340 thereafter. The storage unit 360 only needs to store the previous pulsation interval data, and after the plotting process is performed once, the new pulsation interval data is stored in the storage unit 360. It may be stored in place of the beat interval data.
[0034]
In the embodiment, the time interval of heartbeat detection is measured in the pulsation interval detection unit 340 and output to the control unit 350. However, the pulsation detection unit 330 outputs the time when the R wave is detected. In this way, without passing through the pulsation interval detection unit, it is directly input to the control unit 350, the R wave detection time is stored in the storage unit, and the R wave detection time stored in the storage unit is input in the control unit. The difference between the new R wave detection times is taken as the heartbeat interval.
But you can do the same. In this case, the storage unit may store at least two latest R wave detection times.
[0035]
After the operation signal from the start switch 380 is input to the control unit 350, the processing is continued for a certain time. When the control unit determines that the certain time has passed, the series of processing is finished and the measurement is finished on the display unit 370. A message to this effect is displayed, and the person to be measured can judge. At the end of measurement, not only displays a message indicating the end of measurement on the display unit, but also emits a buzzer sound from a speaker (not shown), or turns on an LED (not shown) or turns on an LED only during measurement. Etc.
Various applications are possible.
[0036]
The end determination is made for a fixed time after the start switch is operated, but a person whose heart rate per unit time is extremely slow, etc., is less likely to be plotted within a fixed time. In that case, if a certain heart rate is detected, a constant number of plots are displayed on the display unit regardless of the heart rate fluctuation per unit time of the subject, and the heart rate fluctuation fluctuation pattern is displayed on the subject. There is a merit that can be grasped without depending on.
[0037]
In the above-described embodiment, the start switch is provided, and the start is determined by the operator's button operation. However, the start is started by constantly monitoring the timing of the output signal from the pulsation interval detection unit 340 with the control unit 350. Without providing a button, it is possible to automate the determination of measurement start without requiring an operator's operation. In this case, if the interval signal from the pulsation interval detection unit is remarkably long, for example, several minutes, it is determined that the measurement has been newly started, and the plot data that has been displayed on the display unit until now is determined. If control is performed to clear and start plot processing, there is an advantage that a start switch is not necessary.
[0038]
In addition, in order to make it easier for the measured person to know the previous Poincare plot state and to grasp changes in the distribution over time, a Poincare plot storage unit and a call button (not shown) are newly provided. That's fine. In this case, when the above-described series of measurements is completed, the control unit stores the data of the Poincare plot point together with the date and time information measured in the Poincare plot storage unit. The dot matrix liquid crystal of 256 × 256 dots shown in the embodiment is used as a display unit, of which 180 × 180 dots are Poincare plot areas, the storage area of the Poincare plot storage unit per dot is 1 byte, and measured date / time information is 12 When using bytes, the storage area for one Poincare plot is 180 × 180 + 10, which is an area of 32,412 bytes. In the case of storing past Poincare plots for 10 times, it is only necessary to have 3324,120 bytes of memory that is 10 times that. When storing in the Poincare plot storage area for the first time, measurement date and time information is stored in the first 12 bytes. It memorize | stores in the address from 0 address of a memory | storage part. If a dot is displayed on the display corresponding to a heart rate interval of 200 to 209 msec on the vertical axis and a heart rate interval of 200 to 209 msec on the horizontal axis, 0 is written to address 12, and if no dot is displayed, FF is set to address 12. (Hexadecimal number) is written, and if a dot is displayed on the display corresponding to a heartbeat interval of 210 to 219 msec on the horizontal axis, 0 is written at address 13 and if no dot is displayed, FF (hexadecimal number) is written at address 12. Similarly, data with a heart rate interval of 1990 to 1999 msec on the horizontal axis is written up to address 190, and the data of the display unit with a heart rate interval of 210 to 219 msec on the vertical axis and a heart rate interval of 200 to 209 msec on the horizontal axis at address 191 By repeating this process up to address 32411, the Poincare plot information for one time is stored. It will be.
[0039]
Next, when the measurement is performed and the information of the Poincare plot is stored, the time information measured from the address 32412 to 32423 of the Poincare plot storage unit is stored in the same manner as the first storage procedure described above, and the address 32324 Up to address 64823, the Poincare plot area is stored as in the first storage procedure.
[0040]
Each time the sequential measurement is completed in this manner, the latest Poincare plot information is stored in the Poincare plot storage unit and, for example, when it exceeds 10 times, the latest Poincare plot information is stored in the oldest storage area (first written area). Like that. For this purpose, the control unit stores the position where the latest Poincare plot information is written in a memory (not shown), and when the measurement is completed, the Poincare plot is stored in the corresponding area of the next Poincare plot storage unit. By writing the information and updating the position information in which the latest Poincare plot information is written, it is possible to store and display 10 new Poincare plot information.
[0041]
When the call button is operated, the display area of the display section is cleared, and from the position where the latest Poincare plot information is written, the latest Poincare plot information is sequentially recalled to the corresponding address in the Poincare plot storage section, and the Poincare area is The Poincare plot is displayed on the display unit according to the procedure stored in the Poincare plot.
[0042]
When the call button is operated again, the Poincare plot information is displayed on the display unit from the position where the Poincare plot information was written one time before. Each time the call button is operated, the Poincare plot measured one time before the current display is displayed. In this manner, a plurality of past Poincare plot patterns can be called and displayed by one call button. When the call button is operated again while the oldest Poincare plot is displayed, the latest Poincare plot may be displayed or the processing may be terminated.
[0043]
In the above example, the control unit can confirm where the plot is on the display unit, but in the case of an inexpensive device, the control unit determines where the point is plotted on the liquid crystal and the state of the display unit. It may not be confirmed. In such a case, a plot storage area is provided, and at the same time it is stored in the display unit, data is stored so that the position to be plotted can be identified, and when the measurement is completed, the data in this plot storage area is read. Thus, it may be written in the Poincare plot storage unit. Further, the data may be directly written in the address as described above directly in the oldest Poincare plot area at the same time when it is displayed on the display unit.
[0044]
In the above example, the Poincare plot storage area allocates 1 byte to 1 dot of the display unit, but it is also possible to allocate 1 dot of the display unit to 1 bit. In that case, the Poincare plot storage area is about 1/8.
[0045]
In the examples so far, the method for displaying the Poincare plot in real time has been shown. However, if the Poincare plot processing is continued for a long time, the overlap of plots increases, making it difficult to identify the pattern. There is a drawback that it is difficult to recognize which plot is. If the resolution of the display unit is fine and the processing and display are performed together after the collection of the electrocardiographic waveform offline, this is not a problem, but it may be inconvenient if it is performed in real time.
[0046]
By displaying a certain number of Poincare plots and adding the processing to erase the information of the oldest Poincare plots, the latest Poincare plot distribution with a constant heart rate can be displayed in real time even for long periods of time. This can be dealt with by changing the memory configuration.
[0047]
For example, it is assumed that 255 heartbeat intervals are calculated from 256 beats in one measurement and plotted. Assuming that the Poincare plot display area has a resolution of 180 × 180 dots (within 255 in one direction) as in the above example, the storage capacity of the storage unit requires 256 bytes in addition to the conventional storage area. Each time the measurement is started and the heartbeat interval is input to the control unit, the dot position of the display unit corresponding to the heartbeat interval input to the storage unit is input to the storage unit, and the address of the storage unit to be stored next is one by one It is gradually increased (incremented). This process is performed each time the heart rate interval data is sequentially input, and when the 256th heart rate interval is measured and input to the control unit, the address to be stored is in an initial state and is stored from the first area. The In this example, the first address to be stored is address 0 and the 256th address is address 255.
[0048]
When the address where the latest dot position corresponding to the heartbeat interval of the storage unit is stored at address 100, when display processing is performed, the Poincare plot area of the display unit is once cleared, and the value at address 100 is Poincare plot. The value at address 99 is plotted on the horizontal axis of the area and the point corresponding to the vertical axis of the Poincare plot is plotted, then the value of address 99 is plotted on the horizontal axis of the Poincare plot area, and the value at address 98 is plotted on the vertical axis of the Poincare plot area. The corresponding points are plotted, and such processing is plotted with the value at address 1 as the value on the horizontal axis and the value at address 0 as the value on the vertical axis, and the value at address 0 is plotted as the value on the horizontal axis at address 255. The value is plotted on the value on the vertical axis, and the processing is continued until address 254 is plotted on the horizontal axis and address 253 is plotted on the vertical axis, and processing is continued until it is plotted on the point having address 102 at the horizontal axis and address 101 at the vertical axis. By performing such processing each time the control unit writes new data to the storage unit, a new Poincare plot distribution for 255 plots is always displayed on the display unit.
[0049]
When this display is performed, a memory having a storage area of 180 dots × 180 dots × 1 byte having a resolution of Poincare plot is provided, and the data at the memory address corresponding to the plot position is set to 1 without plotting directly on the display unit. The memory address data corresponding to the Poincare plot corresponding to the oldest heartbeat interval is deleted (decremented) one by one when the oldest heartbeat interval in the storage unit is updated, and the display is displayed in this memory. When displayed based on the information, display corresponding to the frequency of the Poincare plot is possible. In that case, the display can display gradation and color. If the frequency is high, the display can be changed by increasing the gradation value or changing the color from the case of low frequency. The frequency of plotting can be grasped intuitively.
[0050]
In addition, when the plot points of the Poincare plot are displayed in real time, they may be plotted at the same point without fluctuation. When such a superimposed display is displayed, it may not be known whether the plot has been plotted. In such a case, as described above, the old data is erased and redisplayed or blinked, or gradations or color changes of the plotted points and surrounding dot parts are provided. Is also displayed, it is preferable to display so that it can be seen that it is plotted at the same point by temporarily erasing or changing the surrounding display.
[0051]
In this embodiment, the pulsation (heartbeat) interval is detected from the R peak of the electrocardiogram waveform. However, the present invention is not limited to this as long as the pulsation interval can be detected, and the first rising portion P wave interval of the electrocardiogram waveform. Of course, the pulse interval may be detected from the pulse or pulse wave.
[0052]
【The invention's effect】
As described above, according to the pulsation monitor of the present invention, it is possible to display the Poincare plot in real time, and the measurement subject can easily grasp the state of the heart from the fluctuation component of the pulsation on the spot. It becomes.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a real-time pulsation monitor according to the present invention.
FIG. 2 is a diagram showing a processing example of waveform data output from pulsation measurement in the real-time pulsation monitor of the present invention.
FIG. 3 is a diagram showing an example of a display unit of the real-time pulsation monitor of the present invention.
FIG. 4 is a diagram illustrating a Paincare plotting method of RR intervals.
FIG. 5 is a diagram illustrating a Poincare plot.
FIG. 6 is a diagram illustrating a plot pattern of a Poincare plot.
[Brief description of symbols]
100 Person to be measured
300 beat monitor
310 Electrode section
320 amplifier
330 Beat detector
340 Beat interval detector
350 Controller
360 storage unit
370 display
380 Start switch

Claims (7)

A pulse detecting unit for detecting the beat of the person to be measured, a pulse interval detecting unit for measuring a beat interval for each beat from an output of the pulse detecting unit, and at least immediately before the pulse interval detecting unit A pulse interval storage unit for storing the pulse interval data of the two-dimensional graph, a display unit capable of displaying a two-dimensional graph, and the data of the pulse interval storage unit as a value in one axial direction of the two-dimensional graph, A control unit that sends a plot command to the display unit at a point where the latest data of the interval detection unit is the value of the other axis of the two-dimensional graph, and each time a pulsation signal from the measurement subject is detected A real-time pulsation monitor that sequentially plots in a two-dimensional graph area of the display unit;
The pulsation interval detection unit has a timing function for detecting a heartbeat interval, detects a threshold value of a signal from the pulsation detection unit, and stores a time when the threshold value is exceeded using the timing function. Then, after being below the threshold value, the time interval exceeding the threshold value is output again to the pulsation interval storage unit as the heartbeat interval,
When there is a change from a state in which there is no output from the pulsation detection unit for a certain period of time to a state in which the pulsation is detected, the two-dimensional graph area in the display unit is initialized, and the pulsation interval is plotted for a certain period of time. Real-time pulsation monitor characterized by stopping the pulsation interval plot later . A pulse detecting unit for detecting the beat of the person to be measured, a pulse interval detecting unit for measuring a beat interval for each beat from an output of the pulse detecting unit, and at least immediately before the pulse interval detecting unit A pulse interval storage unit for storing the pulse interval data of the two-dimensional graph, a display unit capable of displaying a two-dimensional graph, and the data of the pulse interval storage unit as a value in one axial direction of the two-dimensional graph, A control unit that sends a plot command to the display unit at a point where the latest data of the interval detection unit is the value of the other axis of the two-dimensional graph, and each time a pulsation signal from the measurement subject is detected A real-time pulsation monitor that sequentially plots in a two-dimensional graph area of the display unit;
The pulsation interval detection unit has a timing function for detecting a heartbeat interval, detects a threshold value of a signal from the pulsation detection unit, and stores a time when the threshold value is exceeded using the timing function. Then, after being below the threshold value, the time interval exceeding the threshold value is output again to the pulsation interval storage unit as the heartbeat interval,
When there is a change from a state in which there is no output from the pulsation detection unit for a certain period of time to a state in which pulsation is detected, the two-dimensional graph area in the display unit is initialized, and a certain number of pulsation interval plots are performed. Real-time pulsation monitor characterized by stopping the pulsation plot after the pulsation interval plot . In the real-time pulsation monitor, a measurement start switch is further provided. Based on the switch operation information, a two-dimensional graph area in the display unit is initialized, a pulsation interval is plotted for a certain time, and a pulsation interval after a certain time has elapsed. 3. The real-time pulsation monitor according to claim 1, wherein the plotting is stopped. The pulsation interval storage unit of the real-time pulsation monitor stores a certain number of the latest pulsation interval data and plots it on the display unit based on the pulsation interval data of the pulsation interval storage unit. The real-time pulsation monitor according to claim 1 or 2, characterized by the above-mentioned. In the real-time pulsation monitor, the pulsation interval storage unit has a ring memory structure, erases the pulsation interval plot data plotted on the display unit based on the oldest stored pulsation interval data, and the storage position thereof The latest pulsation interval data is stored in the real-time pulsation monitor according to claim 1 or 2 . To the display unit of the real-time beat monitor, using a gray-scale display possible or color display capable of displaying device, comprising a sequence storage unit of area fraction plotting the beating gap, the control unit of the display unit based on the number of hits of the corresponding region of the sequence storage unit instead of sequentially plotting a two-dimensional chart area by changing the tone and / or color of the display unit claims, characterized in that to display in the display unit 3. The real-time heart rate monitor according to either 1 or 2 . 3. The real-time pulsation monitor according to claim 1, wherein when the plot display of the display unit is the same point in the real-time pulsation monitor, the plot point is displayed in a blinking manner.

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