JP2005124718A - Rest level display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rest level display device completing a measurement with a single measuring, precisely measuring even in an unstable measuring state by removing data such as disturbance, and securely attached to a blood pressure meter and a massage device. <P>SOLUTION: This rest level display device detects a pulse or a heartbeat within a single measuring time, measures an interval between the continuous pulse and pulse as a pulsation interval, searches a fluctuation state of the pulsation intervals and displays whether or not there is a unsteady fluctuation state. This device is provided with an abnormal threshold for identifying the pulsation interval exceeding a normal level and becoming abnormal due to various reasons and searches the fluctuation state only from the effective pulsation intervals obtained by removing the pulsation intervals exceeding the abnormal threshold. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rest level display device or a sphygmomanometer having such a rest level display device.

  As a conventional rest level display device, a device as disclosed in Japanese Patent No. 2671394 is known (Patent Document 1 below). This device is shown as a driver abnormal state detection device, detects the pulse rate during driving with a pulse sensor, numerically processes the detected pulse rate, and compares it with a preset reference Thus, it is determined whether or not the driver is in a steady state, in an excited state or in an abnormal tension state. That is, whether or not it is in a resting state is discriminated and displayed as whether or not it is in a steady state or an excited state.

  An apparatus disclosed in Japanese Patent Laid-Open No. 8-131424 is also known (Patent Document 2 below). In this rest level display device, the worker's heart rate state was measured twice, after an elapse of time, and numerical processing was performed to obtain the variance and standard deviation of the obtained heart rate. When the result of numerical processing of the heartbeat is large, it is displayed that fatigue has accumulated. That is, whether or not the patient is in a resting state is determined and displayed as whether or not fatigue has accumulated.

However, in any of the above patent documents, a measurement is performed in advance and a reference value is set in advance, and subsequent measurement results with respect to this reference value are compared. It is something that cannot be done. Further, since the obtained beat data is used as it is, there is a possibility that the accuracy of the discrimination display is deteriorated due to abnormal beat data. In other words, abnormal pulsation data may be included depending on the state during measurement, and therefore, if the measurement state is not well managed and measured carefully, the reliability of the measurement result may be affected. There will be.
Japanese Patent No. 2671394 JP-A-8-131424

  The present invention was invented in view of the above-mentioned background art, and the problem is that the measurement is completed with one measurement, and it can be accurately measured even in various measurement states. Another object of the present invention is to provide a rest level display device that can be attached to a blood pressure monitor, a massage device, and the like with peace of mind.

  In order to solve the above-mentioned problem, the rest level display device of the present invention detects a pulse or a heart beat within one measurement time and measures a continuous beat-to-beat interval as a beat interval. In the rest level display device that examines the fluctuation state of the interval and displays whether or not it is a non-steady fluctuation state, it has an abnormal threshold value that identifies a beat interval that exceeds the normal value due to various causes and becomes abnormal. The fluctuation state is examined only from the effective beat interval from which the beat interval exceeding the abnormal threshold is removed.

  Note that the abnormal threshold as described above can be set as appropriate by determining it through experiments or by taking a certain safety factor into a numerical value that can be considered in common sense.

  In the rest level display device of the present invention, since the pulse or heartbeat is detected and the measurement is completed within one measurement time, the measurement is completed with one measurement and the measurement is simple. Further, the variation state is examined only from the effective beat interval from which the beat interval exceeding the abnormal threshold is removed. Therefore, pulsation intervals that exceed the normal value due to various causes, such as disturbances such as body motion, noise detected by an electrocardiogram, and the like are excluded in advance. That is, since the fluctuation state can be known only from the effective beat interval which is a truly effective beat interval, the rest level can be displayed with high accuracy.

  In particular, when calculating a representative value of all measured pulsation intervals as an abnormal threshold and multiplying this representative value by a preset ratio to obtain an upper limit and a lower limit, an appropriate abnormal threshold is set for each measurement. Can be set. For example, if the person to be measured is different for each measurement, an appropriate value can be set for each person, and errors due to individual differences can be reduced.

  The biological information display device as described above can be used alone. In addition to the sphygmomanometer, it is attached to various physiological state display devices such as a thermometer, a blood flow meter, and a sweat meter. Furthermore, it is attached to various devices such as massage machines, and it is possible to display to the users of such devices whether they are resting or unsteady when using such devices. it can.

  For example, when it is attached to a massage machine or the like, it is possible to know whether or not the body is in a resting state as the massage progresses. Moreover, when the rest level displayed in this way is far from the resting state, it is possible to select a massage technique and intensity that will bring a rest and perform a massage that induces the resting state.

  Further, in the sphygmomanometer capable of displaying the rest level as described above, for example, the sphygmomanometer shown in the invention of claim 9, it is accurately known whether or not the measured blood pressure is measured in a resting state. be able to. Therefore, the reliability of the measured blood pressure can be estimated, and when the patient is not at rest, the blood pressure can be reconfirmed by remeasurement.

  The present invention will be described below with reference to FIG. FIG. 1 is a flowchart showing the operation of the rest level display device of the present invention.

  As shown in this figure, first, in step 1, a beat interval within one measurement time is detected. In this case, as in blood pressure measurement, a cuff or the like is wrapped around an arm or finger. The pulsation can be detected by applying a certain amount of pressure. Alternatively, a heartbeat can be measured by an electrocardiogram, and such beats and heartbeat intervals can be used as a series of beat interval data. In step 2, the series of beat interval data is stored in the beat interval storage unit as T1, T2,..., TN. Next, in step 3, the representative value M is calculated by numerically processing the data in the pulsation interval storage unit. In this case, it can be calculated as a representative value M = f (T1, T2,..., TN). Here, f (t) is a representative value calculation function. For example, a function for obtaining an average value, and various functions for obtaining a most frequent value, a median value, and the like can be used. In short, any numerical value that can be defined on behalf of the size of the data group is acceptable. Further, in step 4, using the representative value, an upper limit value XU and a lower limit value XL are calculated as an abnormal threshold value. In this case, XU = (1 + r1) × M, and XL = (1−r2) × M. Here, r1 and r2 are numerical values of 1 or less, and can be determined as a level in consideration of a predetermined reliability limit based on statistical data at rest.

  Further, T1, T2,... TN are sequentially called from the stored series of beat interval data, and it is determined in steps 5a and 5b whether it is smaller than XU or larger than XL, respectively. In these steps, if NO, the stored information is deleted in step 5, and if YES, it is determined in step 5c whether it is the last Nth data, and all the data are determined. Only the effective pulsation interval data obtained by removing all pulsation intervals exceeding the abnormal threshold is obtained in the storage unit.

  The abnormal threshold value is not necessarily set based on the representative value M as described above, and is appropriately set by a preliminary experiment or the like so as to exclude values that are not normally considered such as body movement and disturbance. can do.

  Using the series of effective pulsation interval data obtained as described above, the variation state of the effective pulsation interval data is examined in step 6 and step 7, and the variation state 1 is determined in step 8 or in step 9. The change state 2 is displayed.

  More specifically, in step 6, the effective pulsation interval data is numerically processed to calculate the fluctuation amount V. This variation amount V can be, for example, at least one of a standard deviation, a variation coefficient obtained by dividing the standard deviation by an average value, and a deviation square sum of pulsation intervals. Further, prior to such numerical processing, it is more preferable to further smooth the processed data obtained from the effective pulsation interval, smooth the data, and then check the fluctuation state, and more accurately display the resting state. Is.

  In addition, when the deviation sum of squares of the effective pulsation interval is used as the amount of variation V, this is a value reflecting the number of appearances of the pulsation interval data, and particularly the state change caused by the pulse rate or the like It is a good calculation means to catch. Alternatively, as another expression of the fluctuation amount V, a difference such as an average value of two or more predetermined portions in the data group, such as a difference between pulsation interval data immediately after the measurement and immediately before the measurement, may be calculated.

  Then, the fluctuation amount V obtained in this way is compared with a fluctuation amount reference value Vc that has been set rationally by experiment or the like in advance. If the fluctuation amount V is smaller than Vc, it is assumed that the state is resting, that is, a normal state. The state 1 is displayed at 8. If it is greater than Vc, the state 2 is displayed in step 9 assuming that it is in a non-resting state, that is, an unstable abnormal state. Such a display is easy to visually distinguish between normal and abnormal if, for example, color display such as turning on an LED, and multiple levels if the variation reference threshold is set to a plurality of levels. It can also be displayed. Alternatively, it can be displayed by a level meter, and in this case, it is possible to make it easier to see whether normal or abnormal.

  In addition, it is one of the preferable modes to discriminate the form of pulsation, digitize age or gender as an attribute discrimination index of the user, and change the abnormal threshold corresponding to the attribute discrimination index. is there. This drive mode indicates the shape of the pulse wave if the pulse is being viewed. Such pulse wave shapes are described in, for example, Japanese Patent Application Laid-Open Nos. 2000-300526 and 2000-300525. Moreover, the shape of the electrocardiogram waveform obtained from the output of the electrocardiograph may be used. By knowing the form of pulsation, individual differences can be stratified for each group, and within a group having similar personal characteristics, a variation reference value that is a threshold value for determining the variation state described above Can be set. Therefore, such a reference value is set as a value corresponding to each individual difference, and a highly reliable state determination becomes possible.

  Alternatively, even if the user himself / herself inputs age, sex, etc. as the attributes of the person himself / herself, it is similarly set as a value corresponding to each individual difference, and there is an effect that the state determination with high reliability becomes possible. The stratified means can also use information based on blood pressure values temporarily determined under predetermined conditions, and the pulse pressure indicated by the difference is also effective as a stratified means. Can be used as an index that reflects

  In addition, before selecting effective beat intervals based on the abnormal threshold, as a preliminary selection, it is possible to exclude beat interval data that is estimated to be physiologically unlikely as body movement or disturbance as abnormal values. One of the preferred forms. Or, when a pulsation of intensity that is estimated to be physiologically unlikely such as body movement or disturbance is detected, pulsation interval data including this pulsation may be excluded as an abnormal value It is. Such exclusion of abnormal data can be performed immediately after step 4 or before or after step 2. In particular, prior to storing the pulsation interval in the storage unit, by deleting such abnormal data from the buffer and not transferring the data to the storage area, the storage area is effectively used, and the calculation reliability is improved. Can be improved.

  Also, when the beat interval exceeding the lower limit is detected along with the intensity of the beat exceeding the upper limit that cannot occur physiologically such as body movement or disturbance, the fact that there was body movement is displayed. Can be. In this case, the user can consider the reliability of the measurement result by checking whether there is any body movement.

  Furthermore, the presence of periodicity that matches the respiratory cycle in the pulsation interval is determined, the fluctuations corresponding to this cycle are separated, and if this fluctuation exceeds the respiratory fluctuation discrimination reference value, there is an arrhythmia due to breathing. Can also be displayed. Such irregular heartbeat due to breathing is a phenomenon that usually occurs physiologically, and it is possible to obtain information on the resting state that is more accurate for the user, especially by displaying it separately from the normal state. become.

  FIG. 2 is a flowchart schematically showing the operation of the sphygmomanometer constructed by adding the above-described rest level display device. As shown in this figure, when blood pressure measurement is started, first, in step 1, a part of the body such as an arm is compressed with a cuff body, and a pulse wave in the process of increasing or decreasing the compression pressure is detected. The intensity of the pulse is continuously measured, the blood pressure is measured from the change in the measured pulse, and the blood pressure is displayed in step 2. At this time, with the attached rest level display device, the interval between successive pulses is simultaneously measured as the pulse interval, and the pulse interval exceeding the abnormal threshold for identifying the abnormal pulse interval is removed. The fluctuation state of the pulsation interval is examined only from the pulsation interval, and such a fluctuation state is displayed in step 3.

  In such a sphygmomanometer, it is possible to accurately know whether or not the displayed blood pressure is measured in a resting state from the pulse fluctuation result, and thus the reliability of the measured blood pressure is estimated. It is possible to re-measure blood pressure when the patient is not in a resting state and re-measure. In addition, it is also a preferable form that such a configuration is automatically performed. For example, if the attached rest level display device determines that the patient is in a non-resting state, the biological information such as the measured pulse wave is not recorded, the measurement is stopped, or the remeasurement is automatically performed. Can be configured to.

It is a flowchart which shows operation | movement of the rest level display apparatus which is one Embodiment of this invention. It is a flowchart which shows simply operation | movement of the sphygmomanometer which has the rest level display apparatus which is one Embodiment of this invention.

Claims (9)

  A resting level display device that detects a pulse or heartbeat within one measurement time, measures the interval between successive beats as a beat interval, checks the fluctuation state of these beat intervals, and displays the level. In this method, an abnormal threshold value for identifying a pulse interval that exceeds the normal value due to various causes and an abnormal pulse interval is identified, and the fluctuation state is examined only from the effective pulse interval from which the pulse interval exceeding the abnormal threshold value is removed. A rest level display device characterized by comprising:   2. An abnormal threshold value between an upper limit and a lower limit is obtained by calculating a representative value related to a whole beat interval as the abnormal threshold value and multiplying the representative value by a preset ratio. The rest level display device described.   As a numerical value representing the fluctuation state of the pulsation, at least one of the standard deviation of the pulsation interval, the coefficient of variation obtained by dividing the standard deviation by the average value, or the sum of square deviations of the pulsation interval is used. The rest level display device according to claim 1, characterized in that:   2. The form of pulsation is discriminated and digitized as an attribute discrimination index for a user indicating age or gender, and an abnormal threshold value is varied in accordance with the attribute discrimination index. The rest level display device described.   Before selecting an effective pulse interval based on an abnormal threshold, as a preliminary selection, beat interval data that is estimated to be physiologically unlikely to occur such as body movement or disturbance is excluded as an abnormal value. The rest level display device according to claim 1 or 2.   Before selecting the effective beat interval based on the abnormal threshold, when a beat with a strength that is estimated not to occur physiologically such as body movement or disturbance is detected as a preliminary selection, the beat including this beat 3. The rest level display device according to claim 1, wherein the interval data is excluded as an abnormal value.   When the beat interval exceeding the lower limit is detected, along with the intensity of the beat exceeding the upper limit that cannot occur physiologically such as body movement or disturbance, the fact that there was body movement is displayed. The rest level display device according to claim 1, wherein:   The presence of periodicity that matches the respiratory cycle in the pulsation interval, the fluctuation corresponding to this cycle is separated, and if this fluctuation exceeds the respiratory fluctuation discrimination reference value, there was an arrhythmia due to breathing The rest level display device according to claim 1, wherein:   In a sphygmomanometer that measures the blood pressure from the change in the measured pulse by continuously measuring the intensity of the pulse in the process of pressing the part of the body such as the arm with the cuff body and raising or lowering the compression pressure, Measures the interval between consecutive pulses as a pulse interval, has an abnormal threshold value that identifies abnormal pulse intervals, and beats only from the effective pulse interval that eliminates the pulse interval exceeding the abnormal threshold value A sphygmomanometer, characterized by examining the fluctuation state of the interval and displaying such fluctuation state together with the blood pressure.

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