JP2009219704A - Electronic sphygmomanometer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic sphygmomanometer can notify how many times a user can measure from a charge state of an accumulation device using solar batteries as a power supply. <P>SOLUTION: When the charge is started, a charging current, a charging time and charge characteristics are measured (step S118). A tentative number of measurable times is calculated based on the measured charging current and time and a past average consumption current (step S122). The tentative number of measurable times is corrected based on a state coefficient expressing a deterioration state of the rechargeable battery and estimates the number of measurable times (step S124). During a charging period, the number of measurable times is periodically estimated and the display of the number of measurable times is updated. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a biological information measuring device, and more particularly to an electronic blood pressure monitor including a solar cell and a power storage device.

  Conventionally, a biological information measuring device capable of measuring biological information such as blood pressure and body composition has been commercially available outside the hospital, such as at home.

  For example, in the case of blood pressure, early morning hypertension is related to heart disease and stroke, and detection of early morning hypertension and nocturnal hypertension is regarded as important. Understanding the correlation between time and blood pressure is useful for risk analysis of cardiovascular disease. For that purpose, it is important to measure every day at the same time zone.

  By the way, from the viewpoint of energy saving, there have been small electronic devices equipped with solar cells. Such an electronic device is operated by storing electrical energy output from the solar battery in a power storage device (for example, a rechargeable battery). Therefore, a small electronic device having a power supply configuration including a solar cell and a power storage device can be used separately from a charging place.

  As a method of displaying the charge amount (charge amount) of the power storage device, there are the following methods. Such as a mobile phone that displays the state of charge in several stages, and a display that uses a combination of blinking patterns of indicator lights.

  However, when such a display method is applied to a sphygmomanometer, the user cannot grasp how many times the measurement can be performed.

In a biological information measuring apparatus using a dry battery as a power source, it has been conventionally proposed to display the remaining battery level as the number of measurements (for example, Patent Document 1). Specifically, a biological information measuring device is disclosed by calculating how many times the measurement can be performed based on the voltage of the dry battery. Thereby, the user can grasp | ascertain easily the replacement time of a battery.
JP 2001-245857 A

  As described above, in a home electronic sphygmomanometer, it is important to measure blood pressure at the same time zone every day. However, with a sphygmomanometer that is operable by storing the power generation energy of the solar cell, the user cannot measure the device unless the device is charged if the battery has run out. For this reason, the user must wait for the power storage device to be charged until the measurement becomes possible if the time when the charge is exhausted is a time zone to be measured.

  In a conventional method for displaying a state of charge, the user cannot recognize how long to wait until measurement is possible.

  Since the biological information measuring device of Patent Document 1 uses a dry battery as a power source, it has not been proposed to display the number of measurable times during charging.

  The present invention has been made to solve the above-described problems, and its purpose is to notify how many times measurement is possible from the charged state of a power storage device using a solar cell as a power source. It is to provide an electronic blood pressure monitor that can.

  An electronic sphygmomanometer according to an aspect of the present invention is an electronic sphygmomanometer for measuring the blood pressure of a measurement subject, and receives a sunlight, a solar cell for converting the received light energy into electrical energy, Power storage means for storing electrical energy generated by the solar cell, cuff for winding around a predetermined body part of the person to be measured, detection means for detecting pressure in the cuff, and electricity stored in the power storage means Pressurizing means for pressurizing the cuff using energy as a driving source, and measurement control means for driving the pressurizing means and performing control for measuring the blood pressure of the measurer based on a signal from the detecting means; Display means for displaying the measurement result by the measurement control means, time measuring means for measuring the charging time, current detecting means for detecting the charging current from the solar cell to the storage means, and the charging period A replacement control means for performing control for replacing the charge amount of the power storage means based on the charging time and the charging current with the measurable number of times by the measurement control means, and the replaced measurable number of times are displayed on the display means. Display control means for performing control for this purpose.

  Preferably, the current detection unit further detects a consumption current required for driving the pressurization unit during blood pressure measurement, and the replacement control unit detects an average consumption current for one measurement based on a detection result by the current detection unit. A first average calculating means for calculating the first and second estimating means for periodically estimating the number of measurable times based on the calculated average consumption current and the charge amount of the power storage means. .

  Preferably, the voltage detection means for detecting the voltage of the power storage means and the replacement control means include a first measurement processing means for measuring the voltage detected by the voltage detection means during the charging period as a charging characteristic. In addition, the first estimating means further estimates the number of measurable times based on the past charging characteristics.

  Preferably, the replacement control means further includes second estimation means for estimating the remaining number of times representing the remaining measurable number for each blood pressure measurement.

  Preferably, the replacement control means further includes second measurement processing means for measuring a voltage detected by the voltage detection means during the discharge period as a discharge characteristic, and the second estimation means includes the measured discharge. The remaining number of times is estimated based on the characteristics, the maximum possible number of times replaced by the first replacement unit at the time of the previous charging, and the number of times the measurement has been performed since the previous charging was completed.

  Preferably, the replacement control means further includes a second average calculation means for calculating the current average consumption current for each blood pressure measurement, and the second estimation means is further based on the current average consumption current. Estimate the remaining number of times.

  Preferably, the second estimation means further estimates the remaining number of times based on an average value of past average current consumption.

  Preferably, the replacement control means further includes second estimation means for estimating the remaining number of times representing the remaining measurable number for each blood pressure measurement, and the second estimation means stores the power during the previous charge. The remaining number of times is estimated based on the charge amount charged in the means, the current charge amount, and the past average charge amount.

  According to the present invention, the amount of charge charged in the power storage device is replaced with the measurable number of times and displayed. Therefore, the user can easily grasp whether or not charging has been performed for the number of times desired to be measured.

  Embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

[Embodiment 1]
<Appearance and configuration>
(About appearance)
First, the external appearance of an electronic blood pressure monitor (hereinafter referred to as “blood pressure monitor”) 1 according to the present embodiment will be described with reference to FIGS. 1 and 2.

FIG. 1 is a diagram showing an external appearance of a sphygmomanometer 1 according to Embodiment 1 of the present invention.
Referring to FIG. 1, sphygmomanometer 1 includes a main body portion 10, a cuff 20 for wrapping around the upper arm of the measurement subject, and an air tube 24 for connecting the main body portion 10 and the cuff 20. .

FIG. 2 is a perspective view of main body 10 according to Embodiment 1 of the present invention as viewed from the rear.
Referring to FIGS. 1 and 2, main body 10 is a pentahedron, an installation surface in contact with a table such as a desk, a surface 10 </ b> A forming a predetermined angle with the installation surface, and a surface perpendicular to the installation surface. And have two side surfaces 10B and 10C and a back surface 10D.

  On the surface 10A of the main body 10, a display unit 40 for displaying measurement results and an operation unit 41 for receiving an instruction input from a user (typically a person to be measured) are arranged. The operation unit 41, for example, a power switch 41A for switching power ON / OFF, a measurement switch 41B for inputting a measurement start instruction, and an instruction for reading and displaying past measurement results. And a memory switch 41C.

The display part 40 is comprised by displays, such as a liquid crystal, for example.
The air tube 24 described above is connected to the left side surface 10 </ b> B of the main body 10.

  A solar cell (solar panel) 50 is disposed on the back surface 10 </ b> D of the main body 10. Thus, when the sphygmomanometer 1 is placed at a place where outside light is exposed, such as at the window in the room, the solar cell 50 receives sunlight and converts the received light energy into electrical energy. That is, the solar cell 50 generates electrical energy according to the amount of received light. The generated electrical energy is output to a power storage device built in the main body 10, for example, the rechargeable battery 51 (see FIG. 3).

In addition, the shape of the main-body part 10 of the sphygmomanometer 1 is not limited to such an example.
As described above, the sphygmomanometer 1 according to the present embodiment includes the solar battery 50 and the rechargeable battery 51. In order for the sphygmomanometer 1 to execute a blood pressure measurement process (mainly, driving of the pump), electric power (electric energy) stored in the rechargeable battery 51 is used.

  By the way, as described above, in the case of a home blood pressure monitor, it is useful to measure blood pressure at a predetermined time zone every day. Therefore, it is desirable to charge the solar cell by exposing it to sunlight before the battery runs out.

  On the other hand, it is said that if the rechargeable battery is repeatedly charged when the remaining capacity (charge amount) of the rechargeable battery is greater than or equal to a predetermined threshold value (battery low threshold value), the rechargeable battery deteriorates (shortens life). Therefore, in the case of a sphygmomanometer including a solar battery and a rechargeable battery, the user is highly likely not to charge until just before the battery runs out of charge. Then, when it is desired to measure blood pressure due to forgetting to charge the battery, there is a possibility that the measurement cannot be performed due to the lack of charge.

  In addition, when charging a power storage device with a power source that cannot always supply stable power such as a solar cell, the charging time varies depending on the weather compared to a stable power source such as an AC (Alternating Current) adapter. There is. For example, when a solar cell is used as a power source, the time required to fully charge the power storage device differs by several hours or more during clear weather and during cloudy weather.

  Therefore, in the present embodiment, during the charging period, it is estimated how many times measurement is possible with the amount of charge stored in the rechargeable battery 51, and the result is notified to the user. Thereby, when it wants to measure immediately, a user's charge waiting time can be shortened.

  Below, the example of a structure and operation | movement of such a sphygmomanometer 1 is demonstrated in detail. In the first embodiment, it is assumed that there is only one user (measured person) who measures blood pressure with the sphygmomanometer 1.

(About hardware configuration)
FIG. 3 is a block diagram showing a hardware configuration of sphygmomanometer 1 according to the first embodiment of the present invention.

  Referring to FIG. 3, cuff 20 of sphygmomanometer 1 includes an air bag 21 in which air is contained. The air bladder 21 is connected to an air system 25 built in the main body 10 via an air tube 24.

  The air system 25 includes a pressure sensor 32 for detecting the pressure in the air bag 21 (hereinafter referred to as “cuff pressure”), a pump 33 for supplying air to the air bag 21, and the air in the air bag 21. And an exhaust valve 34 that is opened and closed for draining or sealing.

  The main unit 10 includes a CPU (Central Processing Unit) 100 for centrally controlling and monitoring each unit, a nonvolatile memory unit 39, a display unit 40, an operation unit 41, a power supply unit 42, and a time. A time measuring unit 43 for measuring is incorporated. The main body 10 further includes an oscillation circuit 35, a pump drive circuit 36 for driving the pump 33, and a valve drive circuit 37 for driving the exhaust valve 34 in association with the air system 25.

  The pump drive circuit 36 controls the drive of the pump 33 based on a control signal given from the CPU 100. The valve drive circuit 37 performs opening / closing control of the exhaust valve 34 based on a control signal given from the CPU 100.

  The capacitance value of the pressure sensor 32 changes depending on the cuff pressure. The oscillation circuit 35 outputs a signal having an oscillation frequency corresponding to the capacitance value of the pressure sensor 32 to the CPU 100. The CPU 100 detects the pressure by converting the signal obtained from the oscillation circuit 35 into a pressure.

  The power supply unit 42 supplies power to the CPU 100 in response to a power ON instruction from the operation unit 41. The power supply unit 42 includes a rechargeable battery (storage battery) 51 for storing electrical energy output from the solar battery 50, a voltage detection unit 52 for detecting the voltage of the rechargeable battery 51, and a current to / from the rechargeable battery 51. And a current detection unit 53 for detecting.

  The electrical energy stored in the rechargeable battery 51 is mainly a drive source for the pump drive circuit 36. The rechargeable battery 51 is, for example, a nickel metal hydride battery.

  The voltage detection unit 52 and the current detection unit 53 are each connected to the CPU 100 and output a detection result to the CPU 100. Note that the current detection unit 53 further detects the direction of current flow and outputs the detection result to the CPU 100.

  The memory unit 39 stores various information such as a program for causing the CPU 100 to perform a predetermined operation and measurement result information. Further, information necessary for replacing the charge amount of the rechargeable battery 51 with the measurable number of times is also stored. A configuration example of the memory unit 39 will be described later.

(About functional configuration)
FIG. 4 is a functional block diagram of sphygmomanometer 1 according to the first embodiment of the present invention. Note that hardware that does not directly exchange signals with the CPU 100 is not shown.

  Referring to FIG. 4, CPU 100 includes a measurement control unit 102, a replacement control unit 104, and a display control unit 108.

  The measurement control unit 102 performs control for measuring the blood pressure of the measurement subject. Specifically, the measurement control unit 102 adjusts the cuff pressure by transmitting a control signal to the pump drive circuit 36 and the valve drive circuit 37. Further, the signal from the oscillation circuit 35 is received, and the blood pressure (maximum blood pressure, minimum blood pressure) of the measurement subject is calculated by a known method. The calculated blood pressure is output as a measurement result to the display control unit 108 and stored in the memory unit 39.

  The replacement control unit 104 performs control for replacing the amount of charge charged in the rechargeable battery 51 with the number of measurable blood pressures during the charging period. Whether or not the rechargeable battery 51 is being charged can be determined based on signals (+ or −) from the voltage detection unit 52 and the current detection unit 53. When the voltage is lower than the rating of the rechargeable battery 51 and the current is flowing from the solar battery 50 toward the rechargeable battery 51, it is determined that the rechargeable battery 51 is being charged.

  The replacement control unit 104 measures the charging current, the charging time, and the voltage (charging characteristics) based on signals from the power supply unit 42 and the timer unit 43 during the charging period. More specifically, based on signals from the current detection unit 53 and the voltage detection unit 52, the charging current and the voltage are measured in time series and temporarily recorded in the internal memory. The voltage measured in time series represents the charging characteristics of the rechargeable battery 51. The replacement control unit 104 also measures (counts) the charging time based on the signal from the time measuring unit 43.

  The replacement control unit 104 also calculates an average current consumption (hereinafter referred to as “average current ECp”) for one blood pressure measurement. Specifically, the average current ECp is calculated by calculating the average value of the average consumption current for each measurement (hereinafter referred to as “average current ECt”). Replacement control unit 104 also calculates a state coefficient representing the deterioration state of rechargeable battery 51 based on the charging characteristics stored in memory unit 39.

  During the charging period, the replacement control unit 104 periodically estimates (calculates) the number of measurable times based on the past average current ECp, the state factor of the rechargeable battery 51, and the charging current and charging time measured in real time. ) In the present embodiment, since the state factor of the rechargeable battery 51 is used for estimation of the number of measurable times, a measurable number of times with high accuracy can be obtained. The number of measurable times finally calculated at the end of the charging period is hereinafter referred to as “possible number Nmax”.

  The replacement control unit 104 associates the past average current ECp, the state coefficient of the rechargeable battery 51, the possible number of times Nmax, and the charging characteristics measured during the charging period, and stores them in the memory unit 39.

  Further, the replacement control unit 104 estimates a remaining number representing the remaining measurable number for each blood pressure measurement.

  The replacement control unit 104 measures the voltage (discharge characteristics) of the rechargeable battery 51 based on a signal from the voltage detection unit 52 included in the power supply unit 42 during the discharge period. More specifically, the voltage is measured in time series based on the signal from the voltage detection unit 52 and temporarily recorded in the internal memory. The voltage measured in time series represents the discharge characteristics. Further, during the blood pressure measurement period, the current consumption of the rechargeable battery 51 and the blood pressure measurement time are measured. Specifically, based on a signal from the current detection unit 53, current consumption is measured in time series and temporarily recorded in the internal memory. Further, based on the signal from the time measuring unit 43, the pressurization time of the cuff 20 (drive time of the pump 33) is measured (counted) as the blood pressure measurement time. Specifically, for example, the time from when the start signal of the pump drive circuit 36 is transmitted until when the stop signal is transmitted may be counted as the pressurization time.

  Note that the discharge period includes at least the drive period of the pump 33 in the blood pressure measurement period, and in this embodiment, the discharge period is a period in which the power supply is ON.

  The replacement control unit 104 calculates the current average current ECt for each blood pressure measurement by the measurement control unit 102. Specifically, the current average current ECt is calculated based on the current consumption and the pressurization time required for driving the pump 33. The replacement control unit 104 stores the current average current ECt and the measured charging characteristics in the memory unit 39 in association with each other. In the present embodiment, the average current ECt and the charging characteristics are stored in association with each other, but they may be stored separately.

  Whenever blood pressure measurement is completed, the replacement control unit 104 is based on the possible number of times Nmax stored in the memory unit 39 and the actual number of times of measurement (hereinafter referred to as “the number of times of measurement execution”) since the previous charging was completed. The remaining number of measurable times is estimated (calculated).

  The display control unit 108 displays the measurement result on the display unit 40 for each blood pressure measurement. In addition, the display control unit 108 displays the latest measurable number of times calculated during the charging period and the discharging period (after blood pressure measurement) on the display unit 40. Thereby, the user can grasp | ascertain concretely how many times measurement is actually possible with the electric charge amount of the present rechargeable battery 51. FIG.

  The operation of each functional block included in the CPU 100 may be realized by executing software stored in the memory unit 39, and at least one of these functional blocks is realized by hardware. May be.

(About data structure example)
FIG. 5 is a diagram illustrating a configuration example of the memory unit 39 in the sphygmomanometer 1 according to the first embodiment of the present invention.

  Referring to FIG. 5, memory unit 39 includes a measurement result storage area E1, a charge data storage area E2, and a discharge data storage area E3.

  In the measurement result storage area E1, measurement data MD1,..., MDi,..., MDm (where m = 1, 2, 3,...) For each blood pressure measurement are stored in record units. The measurement data MDi includes systolic blood pressure data SBP indicating the systolic blood pressure, diastolic blood pressure data DBP indicating the diastolic blood pressure, pulse rate data PLS indicating the pulse rate, and measurement date / time data T. The measurement date / time data T is, for example, the date / time when the measurement switch 41B is pressed. Note that the storage format of the measurement result is not limited.

  In the charge data storage area E2, charge data CD1,..., CDj,..., CDn (where n = 1, 2, 3,...) For each charge are stored in record units. In the discharge data storage area E3, discharge data DD1,..., DDk,..., DDn (where n = 1, 2, 3,...) For each blood pressure measurement are stored in record units.

FIG. 6 is a diagram showing an example of the data structure of the charging data CDj in the first embodiment.
Referring to FIG. 6, charging data CDj includes five fields 81 to 85 of “date and time”, “state coefficient”, “average current ECp”, “possible number of times Nmax”, and “charging characteristics”. To summarize the contents of each field, the “date and time” field 81 stores information such as the charging start date and time and the charging period. Further, the “state coefficient” field 82 stores state coefficient data based on the previous charging characteristics. The “average current ECp” field 83 stores past average current ECp data. The “number of possible times Nmax” field 84 stores data of the number of possible times Nmax estimated during the charging period. The “charging characteristics” field 85 stores data of charging characteristics measured during this charging period.

  FIG. 7 is a diagram illustrating a data structure example of the charging characteristic field 85 included in the charging data. Referring to FIG. 7, charge characteristic field 85 has an area 851 for storing “time data” and an area 852 for storing “voltage data”.

  In the area 851, a plurality of time data 1, 2, 3,..., N corresponding to the sampling period are stored. In the area 852, voltage data V (1), V (2),..., V (n) are stored in association with the time data in the area 851.

FIG. 8 is a diagram illustrating an example of a data structure of the discharge data DDk in the first embodiment.
Referring to FIG. 8, discharge data DDk includes three fields 91 to 93 of “date and time”, “average current ECt”, and “discharge characteristics”. To summarize the contents of each field, the “date and time” field 91 stores information such as the discharge start date and time and the discharge period. The “average current ECt” field 92 stores data of the average current ECt consumed during this discharge period. The “discharge characteristic” field 93 stores discharge characteristic data measured during this discharge period. The data structure example of the discharge characteristic field 93 may be the same as that of the charge characteristic shown in FIG. Therefore, description of this will not be repeated.

  Instead of storing the average current ECt, time-series consumption current and pressurization time may be stored.

  Moreover, the storage format of charge data and discharge data is not particularly limited. Further, only the discharge data after the previous charge may be stored in the discharge data storage area E3.

  In the present embodiment, when the charging period and the discharging period are ended, the latest measurable number of times is stored in a predetermined area (not shown) of the memory unit 39. Thus, the display control unit 108 can display the latest measurable number of times on the display unit 40 even when the power is turned on.

<About operation>
Hereinafter, an operation when the sphygmomanometer 1 updates the measurable number of times during the charging period and the discharging period will be described.

1. FIG. 9 is a flowchart showing the number updating process executed by the CPU 100 of the sphygmomanometer 1 according to the first embodiment of the present invention during the charging period. The process shown in the flowchart of FIG. 9 is stored in advance in the memory unit 39 as a program, and the CPU 100 reads out and executes this program, thereby realizing the function of the number update process. In addition, this process shall be started when charge is started.

  Referring to FIG. 9, first, replacement control unit 104 determines whether or not discharge data is stored in discharge data storage region E3 of memory unit 39 (step S102). If it is determined that there is discharge data (YES in step S102), the process proceeds to step S104. If it is determined that there is no discharge data (NO in step S102), the process proceeds to step S106.

  In step S104, the replacement control unit 104 reads the average current ECt of all discharge data. The replacement control unit 104 calculates the average value of the read average current ECt, that is, the past average current ECp (step S108). The calculated average current ECp is temporarily recorded in the internal memory.

  In step S106, the replacement control unit 104 sets a default average current ECp (predetermined current consumption value).

  When the average current ECp is calculated or set, the replacement control unit 104 determines whether or not charging data is stored in the charging data storage area E2 of the memory unit 39 (step S110). If it is determined that charging data exists (YES in step S110), the process proceeds to step S112. If it is determined that there is no charging data (NO in step S110), the process proceeds to step S116.

  In step S112, replacement control unit 104 reads the charging characteristics of the charging data including at least the previous time. The replacement control unit 104 calculates a state coefficient based on a predetermined charging characteristic of the rechargeable battery 51 when new and one or more charging characteristics including at least the latest charging characteristic.

  FIG. 10 is a graph showing changes in the charging characteristics of the rechargeable battery 51. Referring to FIG. 10, time ta represents a full charge time when rechargeable battery 51 is new, and time tb represents a full charge time when rechargeable battery 51 has deteriorated.

  In both the charge characteristic and the discharge characteristic, when the charge / discharge cycle (repetition of charge and discharge) proceeds, the characteristic of the rechargeable battery 51 changes (deteriorates). That is, the charging time is shortened and the discharging time is shortened. Therefore, in order to accurately estimate the number of measurable times, the current state of the rechargeable battery 51, that is, the degree of deterioration is calculated as a state coefficient. Assuming that the current full charge time of the rechargeable battery 51 is the time tb, the state factor can be calculated by dividing the time tb by the time ta. As a specific numerical value of the state coefficient, for example, 0.7 to 1.0 is assumed. However, the rechargeable battery voltage at the start of charging is assumed to be the same value.

  The state coefficient calculated in step S114 is temporarily recorded in the internal memory (step S114). In the present embodiment, the state factor is calculated based on the charging characteristics, but may be calculated based on the discharging characteristics.

  In step S116, the replacement control unit 104 determines that the rechargeable battery 51 is new and sets a state coefficient “1”.

  When the state coefficient is calculated or set, the replacement control unit 104 starts measuring the charging current, the charging time, and the voltage (charging characteristics) (step S118). The measured voltage is recorded in time in the internal memory.

  Next, the replacement control unit 104 determines whether charging is in progress (step S120). If it is determined that charging is in progress (YES in step S120), the process proceeds to step S122. If it is determined that charging has been completed (NO in step S120), the process proceeds to step S128.

  In step S122, the replacement control unit 104 calculates a temporary measurable number of times (hereinafter referred to as “temporary possible number of times”) based on the above-described average current ECp and the charging current and charging time measured in step S118. . Specifically, it is calculated by the following equation (1).

Temporary possible number of times (y1) = {charging current × charging time} / average current ECp (1)
Thus, the provisional possible number of times is estimated by dividing the current charge amount by the average current ECp. In addition, Formula (1) is a formula assuming the case where the remaining capacity (charge amount) of the rechargeable battery 51 at the time when charging is started is zero. It is assumed that the provisional possible number of times is calculated after adding to the current charge amount. In this case, the remaining capacity of the rechargeable battery 51 is calculated based on, for example, the discharge characteristics of the previous charge data, the possible number of times Nmax, and the number of measurement executions since the completion of the previous charge.

  Subsequently, the replacement control unit 104 estimates the measurable number of times by correcting the tentative number of times with the above-described state coefficient (step S124). Specifically, first, the charging characteristic (voltage-time characteristic) of the rechargeable battery 51 is converted from the calculation result in step S122 into a relational expression (for example, a primary expression) indicating the measurable number of times-time characteristic. Then, the converted relational expression is corrected with the state coefficient.

  FIG. 11 is a graph showing the relationship between the charging characteristics of the rechargeable battery 51 and the measurable number of times-time characteristics. Referring to FIG. 11, a curve 61 represents a charging characteristic (relation between voltage and time), and a straight line 62 represents a measurable frequency-time characteristic (relation between measurable frequency and time). The curve 61 may include not only the charging characteristics of the current charging period but also charging characteristics in past charging data. Thereby, even when charging is repeated halfway, the charge amount of the rechargeable battery 51 can be accurately replaced with the measurable number of times.

  More specifically, the measurable number of times (the correction value of the tentatively possible number) is calculated by the following equation (2).

y1 ′ = y1 × c (2)
However, y1 ′ represents the number of possible measurements, y1: the number of possible provisions, and c: the state coefficient.

  The estimated measurable number of times is output to the display control unit 108, and the latest measurable number of times is displayed (step S126). When this process ends, the process returns to step S118 and the above process is repeated. Thereby, during the charging period, the display of the number of measurable times is updated according to the charge amount (increase in charge amount). Note that the measurable number of times after the update represents the possible number of times Nmax.

FIG. 12 is a diagram showing an example of the screen displayed in step S126 of FIG.
Referring to FIG. 12, the display unit 40 displays a measurable number of times in a predetermined display area 405. Since the measurable number of times is updated during the charging period, the user can grasp how much the measurable number of times has increased in the current charging. Therefore, when it is desired to measure the blood pressure immediately after the battery has run out, the measurement can be performed when the measurable number of times becomes “1”.

  Referring to FIG. 9 again, in step S128, replacement control unit 104 associates average current ECp, state coefficient, possible number of times Nmax, and charging characteristics with each other in charging data storage area E2 of memory unit 39. Store. Further, the replacement control unit 104 records the latest measurable number of times, that is, the possible number of times Nmax, in a predetermined area (not shown) of the memory unit 39.

When the process of step S128 ends, the number of times update process at the time of charging ends.
2. FIG. 13 is a flowchart showing the number update process executed by the CPU 100 of the sphygmomanometer 1 during the discharge period in the embodiment of the present invention. The process shown in the flowchart of FIG. 13 is stored in advance in the memory unit 39 as a program, and the CPU 100 reads out and executes this program, thereby realizing the function of the number update process. This process is started when the power switch 41A is pressed.

  Referring to FIG. 13, first, replacement control unit 104 starts measuring the voltage (discharge characteristics) of rechargeable battery 51 (step S202). Next, it is determined whether or not measurement switch 41B has been pressed, and voltage measurement is repeated until measurement switch 41B is pressed (NO in step S204). The voltage measured in step S202 is temporarily recorded in time series in the internal memory.

  If it is determined that measurement switch 41B has been pressed (YES in step S204), the process proceeds to step S206.

  In step S206, the replacement control unit 104 determines whether or not the current voltage of the rechargeable battery 51 is battery low (predetermined threshold). If it is determined that the battery is not low (NO in step S206), the process proceeds to step S208 and step S210. If it is determined that the battery is low (YES in step S206), a message indicating that the battery is low is displayed on the display unit 40 (step S216), and this number of times update processing is terminated. It should be noted that the number updating process at the time of discharging is terminated not only when the battery is low but also when the power is turned off.

  In step S208, blood pressure measurement processing is executed. The blood pressure measurement process will be described later using the subroutine of FIG. In the present embodiment, the process of step S210 is executed in parallel with the blood pressure measurement process.

  In step S <b> 210, the replacement control unit 104 measures the current flowing out of the rechargeable battery 51 (mainly the current consumed for driving the pump 33) and the pressurization time, in addition to the voltage (discharge characteristics) of the rechargeable battery 51. The measured voltage and current consumption are temporarily recorded in time series in the internal memory.

  When the blood pressure measurement process ends, the process of step S210 ends, and the process proceeds to step S212.

  In step S212, the replacement control unit 104 calculates the current average current ECt based on the current consumption measured in step S210.

  Next, the replacement control unit 104 associates the average current ECt calculated in step S212 with the discharge characteristics temporarily recorded in the internal memory, and stores them in the discharge data storage area E3 of the memory unit 39 (steps). S213).

  Subsequently, the replacement control unit 104 executes remaining number estimation processing (step S214). This process will be described in detail later using the subroutine of FIG. When the remaining number estimation process ends, the process returns to step S202.

(Blood pressure measurement process)
FIG. 14 is a flowchart showing the blood pressure measurement process executed in step S208 of FIG. The blood pressure measurement process described below is an example, and the blood pressure measurement technique is not particularly limited.

  Referring to FIG. 14, measurement control unit 102 first performs an initialization process (step S302). Specifically, the air in the air bladder 21 is exhausted, the pressure sensor 32 is corrected, and the like.

When the measurement control unit 102 enters the measurable state, it starts driving the pump 33 and gradually increases the pressure of the air bladder 21 (step S304). When the cuff pressure reaches a predetermined level for blood pressure measurement, the measurement control unit 102 stops the pump 33, gradually opens the closed exhaust valve 34, and gradually exhausts the air in the air bladder 21. Thereby, the cuff pressure is gradually reduced (step S306).

  Next, the measurement control unit 102 calculates blood pressure (maximum blood pressure, minimum blood pressure) by a known procedure (step S308). Specifically, in the process of gradually reducing the cuff pressure, the measurement control unit 102 extracts pulse wave information based on the oscillation frequency obtained from the oscillation circuit 35. Then, the blood pressure is calculated from the extracted pulse wave information. The measurement control unit 102 may further calculate the pulse rate by a known procedure.

  When the process of step S108 ends, the measurement control unit 102 records the calculated blood pressure and pulse rate in the measurement result storage area E1 of the memory unit 39 (step S310). The display control unit 108 displays the calculated blood pressure on the display unit 40 (step S312). The blood pressure may be displayed together with the measurable number of times estimated in the remaining number estimation process.

(Remaining count estimation process)
FIG. 15 is a flowchart showing the remaining number estimation process executed in step S214 of FIG. 13 in the first embodiment of the present invention.

  Referring to FIG. 15, replacement control unit 104 reads the discharge characteristics of the discharge data stored in discharge data storage area E3 of memory unit 39 (step S402). Further, the possible number Nmax of the latest charge data stored in the charge data storage area E2 is read.

  The replacement control unit 104 calculates the blood pressure measurement count (measurement execution count) after the previous charging is completed (step S406). Specifically, the latest charging end date and time is acquired from the data stored in the date and time field 81 of the latest charging data. And the number of times of measurement execution can be calculated by counting the number of data after the charging end date and time among the measurement data stored in the measurement result storage area E1.

  Next, the replacement control unit 104 calculates a relational expression (for example, a primary expression) between the voltage of the rechargeable battery 51 and the number of measurement executions based on the read discharge characteristics and the possible number of times Nmax and the calculated number of measurement executions ( Step S408).

  FIG. 16 is a graph showing the relationship between the discharge characteristics of the rechargeable battery 51 and the rechargeable battery voltage-measurement execution frequency characteristics. Referring to FIG. 16, curve 63 represents discharge characteristics (relationship between voltage and time), and straight line 64 represents rechargeable battery voltage-measurement frequency characteristics (relationship between voltage and measurement frequency). . Curve 63 includes all the charging characteristics since the last charging was completed. The discharge start timing may not be full charge.

  In step S408, specifically, a linear approximation formula of the curve 63 as shown by the straight line 64 can be calculated by obtaining the slope of the relational expression by the following equation (3).

Δy2 = −a2 × Δx2 + k (3)
However, Δy2: Rechargeable battery voltage change, a2: Inclination, Δx2: Measurement number change, k: Representable number of times Nmax at the time of previous charging.

  When the relational expression is calculated in step S408, the replacement control unit 104 estimates (calculates) the measurable number of times (remaining number of times) based on the relational expression (step S410). The estimated measurable number of times (remaining number of times) is output to the display control unit 108, and the latest measurable number of times is displayed (step S412). Thereby, the display of the number of measurable times is updated every time the blood pressure measurement process is executed. When this process ends, the process returns to the main routine.

  Thus, since the number of measurable times is calculated using the latest discharge characteristics even during discharge, the measurable number of times can be accurately estimated even when the rechargeable battery 51 has deteriorated.

FIG. 17 is a diagram illustrating an example of a screen displayed in step S412 of FIG.
Referring to FIG. 17, the measurable number of times is displayed in a predetermined display area 405 of display unit 40 as in FIG. 12. In the present embodiment, the measurement result is displayed together with the measurable number of times. Specifically, the measurement date and time is displayed in the display area 401, and the systolic blood pressure, the diastolic blood pressure, and the pulse rate are displayed in the display areas 402 to 404, respectively. Thereby, the user can grasp | ascertain the latest measurable frequency | count every time blood pressure measurement is complete | finished. Alternatively, the latest measurable number of times may be called at any time.

  It is assumed that the measurable number of times calculated in step S410 is recorded in a predetermined area (not shown) of the memory unit 39 by the replacement control unit 104. As a result, the latest measurable number of times can be displayed even at the start of the number updating process at the time of discharging and the number updating process at the time of charging.

  As described above, according to the present embodiment, the display of the measurable number of times is updated during the charging period. Therefore, the user can charge as many times as the number of measurements he wants to use, and the charge waiting time can be reduced.

  In addition, since the latest measurable number of times is always displayed, it is possible to prevent sudden charge cut and to facilitate charge management. Furthermore, charging efficiency can be improved. As a result, the life of the rechargeable battery 51 can be prevented from being shortened.

  In the present embodiment, the state factor of the rechargeable battery 51 is also used when calculating the possible number of times Nmax during charging. Therefore, even when the rechargeable battery 51 has deteriorated, it is possible to prevent the estimation accuracy of the measurable number of times from decreasing. The user can also determine the life of the rechargeable battery 51.

  Furthermore, when calculating the possible number of times Nmax during charging, the amount of charge consumed (current consumption and pressurization time) during blood pressure measurement is also used. That is, in both cases of charge / discharge, the number of measurable times is estimated based on the average value of the amount of charge consumed during blood pressure measurement. As a result, as charging / discharging is repeated, the estimation accuracy of the measurable number of times can be improved.

<Modification>
In the first embodiment, it is assumed that there is only one user (measured person) of the sphygmomanometer 1. However, there may be a plurality of users of the sphygmomanometer 1, and such a case will be described as a modification of the first embodiment. In the modification of the present embodiment, the configuration and basic operation of sphygmomanometer 1 are the same as those in the first embodiment. Therefore, only the differences from the first embodiment will be described below.

In the present modification, only the remaining number estimation process is different from the first embodiment.
FIG. 18 is a flowchart showing the remaining number estimation process executed in step S214 of FIG. 13 in the modification of the first embodiment of the present invention.

  Referring to FIG. 18, replacement control unit 104 reads average current ECp from the latest charge data stored in charge data storage area E2 (step S502). Next, it is determined whether or not the current average current ECt calculated in step S212 in FIG. 13 is equal to the read average current ECp (step S504). If it is determined that they are equal (YES in step S504), the process proceeds to step S509. If it is determined that they are not equal (NO in step S504), the process proceeds to step S508. Here, if the current average current ECt is not equal to the average current ECp, the process proceeds to step S508. However, the process may proceed to step S508 only when the difference between the two is equal to or greater than a predetermined value.

  In step S508, the replacement control unit 104 calculates a battery capacity consumption coefficient for the current measurement. The capacity consumption coefficient represents the ratio of the current average current ECt to the past average current ECp, and is obtained by dividing the past average current ECp by the current average current ECt. As a specific numerical value of the capacity consumption coefficient, for example, 0.7 to 1.3 is assumed.

  In step S509, the replacement control unit 104 sets “1” as the capacity consumption coefficient.

  When the calculation or setting of the capacity consumption coefficient is completed, the replacement control unit 104 can be included in the discharge characteristics of the discharge data stored in the discharge data storage area E3 and the most recent charge data stored in the charge data storage area E2. The number Nmax is read (step S510).

  Next, the replacement control unit 104 calculates the blood pressure measurement number (measurement execution number) after the previous charging is completed (step S512). Further, a relational expression between the voltage of the rechargeable battery 51 and the number of times of measurement is calculated (step S514). Since the processes in steps S512 and S514 are the same as those in steps S406 and S408, respectively, the description thereof will not be repeated.

  Subsequently, the replacement control unit 104 corrects the relational expression calculated in step S514 based on the capacity consumption coefficient (step S516). The corrected relational expression can be calculated by the following expression (4).

y2 ′ = − a2 × e × Δx + k (4)
Where e: capacity consumption coefficient.

  The replacement control unit 104 calculates the measurable number of times based on the corrected relational expression (step S518). The estimated measurable number of times (remaining number of times) is output to the display control unit 108, and the latest measurable number of times is displayed (step S520). Thereby, also in a modification, whenever a blood pressure measurement process is performed, the display of the frequency | count of measurable is updated. When this process ends, the process returns to the main routine.

  As described above, in the process of updating the number of times during discharge in the modification of the first embodiment, the linear approximation formula is corrected by the capacity consumption coefficient when calculating the number of measurable times. That is, when estimating the remaining number of times during the discharge period, a difference in physical characteristics (for example, arm circumference size, blood pressure height) for each person to be measured is taken into consideration. Thereby, even when the sphygmomanometer 1 is used by a plurality of persons to be measured, the number of measurable times can be calculated with high accuracy.

[Embodiment 2]
Although the sphygmomanometer in the above-described first embodiment and its modification includes a rechargeable battery as a power storage device, the sphygmomanometer in the second embodiment of the present invention includes a capacitor as a power storage device.

  The basic configuration and operation of the sphygmomanometer in the present embodiment are the same as those of sphygmomanometer 1 in the first embodiment. Therefore, the reference numerals shown in FIGS.

Only the parts different from the first embodiment will be described below.
FIG. 19 is a functional block diagram of sphygmomanometer 1 according to the second embodiment of the present invention.

  Referring to FIG. 19, in the present embodiment, power supply unit 42 includes a capacitor 51 </ b> A instead of rechargeable battery 51. Further, the CPU 100 includes a replacement control unit 104 </ b> A instead of the replacement control unit 104. Specific functions of the replacement control unit 104A will be described later.

  When the power storage device is the capacitor 51A, the charging characteristics and the discharging characteristics can be regarded as linear if the capacity of the capacitor 51A is sufficiently large. A typical example of the charging characteristics of the capacitor 51A is shown in FIG. As shown in FIG. 20, the charging characteristic of the capacitor 51A can be considered to be linear. In this embodiment, it is not necessary to approximate the charging characteristic linearly.

  In addition, even when the capacitor 51A is repeatedly charged and discharged, the charging characteristics and the discharging characteristics do not change (the life is not shortened). Therefore, when estimating the number of measurable times, correction by the state coefficient is not necessary.

  FIG. 21 shows an example of the data structure of charge data CDj # in the second embodiment. Referring to FIG. 21, charge data CDj # includes three fields 81, 83, and 86 of “date and time”, “average current ECp”, and “total charge amount”. Compared with the charging data CDj in the first embodiment, the state coefficient, the possible number of times Nmax and the charging characteristics are not included, and the total charge amount is newly added. The total charge amount field 86 stores data on the total charge amount stored in the capacitor 51A during this charging period. The total charge amount includes the amount of charge remaining before charging (hereinafter referred to as “remaining capacity”) and the amount of charge increased by charging (hereinafter referred to as “current charging amount”).

  FIG. 22 shows an example of the data structure of discharge data DDk # in the second embodiment. Referring to FIG. 22, discharge data DDk # includes three fields 91, 92, and 94 of “date and time”, “average current ECt”, and “pressurization time”. Compared with the discharge data DDk in the first embodiment, the discharge characteristic is not included, and a pressurizing time is newly added. The pressurization time field 94 stores the pressurization time (corresponding to the blood pressure measurement time) in this discharge period. In the present embodiment, since the time other than the measurement is not established in the power-on state, the power-on time is set only during the measurement.

1. FIG. 23 is a flowchart showing the number updating process executed by the CPU 100 of the sphygmomanometer 1 according to the second embodiment of the present invention during the charging period. In addition, the same step number is attached | subjected about the process similar to the flowchart of FIG. 9 of Embodiment 1. FIG. Therefore, the description about them is not repeated.

  In the present embodiment, steps S110 to S116 are not required. Instead of step S118, step S118A is executed.

  In step S118A, replacement control unit 104A measures the charging current and the charging time. That is, the charging characteristics are not measured.

  If it is determined in step S120 that charging is in progress (YES in step S120), the same processing (steps S122 and S126) as in the first embodiment is executed.

  On the other hand, if it is determined that charging is not being performed (NO in step S120), the replacement control unit 104A calculates the current charge amount (step S1271). Specifically, the current charge amount is calculated based on the charging current and the charging time measured in step S112A.

  Next, the replacement control unit 104A calculates the total amount of charge that the capacitor 51A currently has (step S1272). Specifically, the total charge amount is calculated by adding the current charge amount and the remaining capacity. The remaining capacity is calculated by the following procedure, for example. That is, the total charge amount at the completion of charging is read from the previous charging data. Further, the average current ECt and the pressurization time are read from the discharge data after the previous charge, and the amount of electric charge consumed (discharge amount) from the previous charge is calculated. A value obtained by subtracting the amount of electric charge consumed from the total amount of electric charge at the previous charging is the remaining capacity. When this process ends, the process proceeds to step S128A.

  In step S128A, the replacement control unit 104A associates the average current ECp and the total charge amount calculated in step S1272 and stores them in the charge data storage area E2 of the memory unit 39. Instead of the total charge amount, a set of charging current and charging time may be stored, and the total charge amount may be calculated in the number updating process at the time of discharging.

2. In this embodiment, it is assumed that not the discharge characteristics but the pressurization time is stored in step S213 of the flowchart of FIG.

  FIG. 24 is a flowchart showing the remaining number estimation process executed in step S214 of FIG. 13 in the second embodiment of the present invention.

  Referring to FIG. 24, replacement control unit 104A reads average current ECt and pressurization time of all discharge data, and average current ECp and total charge amount of the latest charge data (step S602).

  Next, the replacement control unit 104A calculates the average charge consumption for one measurement based on the average current ECp and the past pressurization time (step S604). Specifically, it is obtained by calculating an average value (average pressurization time) of the read past pressurization time and multiplying the calculated average pressurization time by the average current ECp.

  In addition, the replacement control unit 104A calculates the amount of charge consumed in the current measurement based on the current measurement time and the current average current ECt (step S606).

  The replacement control unit 104A can measure the number of remaining times (remaining number) based on the total charge amount read in step S602, the consumed charge amount calculated in step S606, and the average consumed charge amount calculated in step S604. Is estimated (step S608). Specifically, it is calculated by (total charge amount−consumed charge amount) / average consumed charge amount. The estimated measurable number of times (remaining number of times) is output to the display control unit 108, and the latest measurable number of times is displayed (step S610). Thereby, the display of the number of measurable times is updated every time the blood pressure measurement process is executed. When this process ends, the process returns to the main routine.

  Thus, also in the present embodiment, as in the first embodiment, the user can charge for the number of times of measurement desired to be used, and the charging waiting time can be shortened. In addition, since the latest measurable number of times is always displayed, it is possible to prevent sudden charge cut and to facilitate charge management.

  In both cases of charge and discharge, the number of measurable times is estimated based on the average value of the amount of charge (discharge amount) consumed in blood pressure measurement. As a result, as charging / discharging is repeated, the estimation accuracy of the measurable number of times can be improved.

  In the present embodiment, the number of measurable times estimated in step S608 may be corrected using the capacity consumption coefficient in consideration of use by a plurality of users.

  Moreover, the update method of the measurable frequency | count which the blood pressure meter of this invention performs can also be provided as a program. Such a program can be recorded on an optical medium such as a CD-ROM (Compact Disc-ROM) or a computer-readable recording medium such as a memory card and provided as a program product. A program can also be provided by downloading via a network.

  The provided program product is installed in a program storage unit such as a flash memory and executed. Note that the program product includes the program itself and a storage medium in which the program is stored.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a figure which shows the external appearance of the blood pressure meter in each embodiment of this invention. It is the perspective view which looked at the main-body part of the blood pressure meter in each embodiment of this invention from back. It is a block diagram which shows the hardware constitutions of the blood pressure meter in each embodiment of this invention. It is a functional block diagram of the sphygmomanometer in Embodiment 1 of the present invention and its modification. It is a figure which shows the structural example of the memory part in the blood pressure meter of each embodiment of this invention. It is a figure which shows an example of the data structure of the charge data in Embodiment 1 of this invention. It is a figure which shows the example of a data structure of the charge characteristic field contained in charge data. It is a figure which shows an example of the data structure of the discharge data in Embodiment 1 of this invention. It is a flowchart which shows the frequency update process which CPU of the sphygmomanometer in Embodiment 1 of this invention and its modification performs in a charging period. It is a graph which shows the change of the charge characteristic of a rechargeable battery. It is a graph which shows the relationship between the charge characteristic of a rechargeable battery, and the measurable frequency-time characteristic. It is a figure which shows an example of the screen displayed by step S126 of FIG. It is a flowchart which shows the frequency update process which CPU100 of the blood pressure meter 1 in each embodiment of this invention performs in a discharge period. It is a flowchart which shows the blood pressure measurement process performed in step S208 of FIG. 14 is a flowchart showing remaining number estimation processing executed in step S214 in FIG. 13 in Embodiment 1 of the present invention. It is a graph which shows the relationship between the discharge characteristic of a rechargeable battery, and a rechargeable battery voltage-measurement execution frequency characteristic. It is a figure which shows an example of the screen displayed in FIG.15 S412. It is a flowchart which shows the remaining number estimation process performed in FIG.13 S214 in the modification of Embodiment 1 of this invention. It is a functional block diagram of the sphygmomanometer in Embodiment 2 of the present invention. It is a graph which shows the typical example of the charge characteristic of a capacitor. It is a figure which shows an example of the data structure of the charge data in Embodiment 2 of this invention. It is a figure which shows an example of the data structure of the discharge data in Embodiment 2 of this invention. It is a flowchart which shows the frequency update process which CPU of the blood pressure meter in Embodiment 2 of this invention performs in a charging period. In Embodiment 2 of this invention, it is a flowchart which shows the remaining frequency estimation process performed in step S214 of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Blood pressure monitor, 10 main-body part, 10A surface, 10B, 10C side surface, 10D back surface, 20 cuff, 21 Air bag, 24 Air tube, 25 Air system, 32 Pressure sensor, 33 Pump, 34 Exhaust valve, 35 Oscillation circuit, 36 Pump drive circuit, 37 Valve drive circuit, 39 Memory part, 40 Display part, 41 Operation part, 41A Power switch, 41B Measurement switch, 41C Memory switch, 42 Power supply part, 43 Timekeeping part, 50 Solar battery, 51 Rechargeable battery, 51A Capacitor, 52 Voltage detector, 53 Current detector, 100 CPU, 102 Measurement controller, 104, 104A Replacement controller, 108 Display controller, E1 measurement result storage area, E2 charge data storage area, E3 discharge data storage area.

Claims (8)

An electronic sphygmomanometer for measuring a subject's blood pressure,
A solar cell for receiving sunlight and converting the received light energy into electrical energy;
Power storage means for storing electrical energy generated by the solar cell;
A cuff for wrapping around a predetermined body part of the measurement subject;
Detection means for detecting the pressure in the cuff;
Pressurizing means for pressurizing the cuff using the electrical energy stored in the power storage means as a drive source;
Measurement control means for driving the pressurizing means and performing control for measuring the blood pressure of the measurer based on a signal from the detection means;
Display means for displaying the measurement results by the measurement control means;
A time measuring means for measuring the charging time;
Current detection means for detecting a charging current from the solar cell to the power storage means;
A replacement control means for performing control for replacing the charge amount of the power storage means based on a charging time and a charging current with a measurable number of times by the measurement control means during a charging period;
An electronic sphygmomanometer, comprising: display control means for performing control for displaying the replaced number of possible measurements on the display means. The current detecting means further detects a current consumption required for driving the pressurizing means during blood pressure measurement,
The replacement control means includes
First average calculating means for calculating an average current consumption for one measurement based on a detection result by the current detecting means;
2. The electronic sphygmomanometer according to claim 1, further comprising: first estimation means for periodically estimating the number of measurable times based on the calculated average consumption current and the charge amount of the power storage means. Voltage detection means for detecting the voltage of the power storage means;
The replacement control means further includes a first measurement processing means for measuring a voltage detected by the voltage detection means during a charging period as a charging characteristic,
The electronic sphygmomanometer according to claim 2, wherein the first estimating means further estimates the number of measurable times based on past charging characteristics.   The electronic sphygmomanometer according to claim 1, wherein the replacement control means further includes second estimation means for estimating a remaining number of times representing the remaining measurable number for each blood pressure measurement. The replacement control means further includes second measurement processing means for measuring a voltage detected by the voltage detection means during a discharge period as a discharge characteristic,
The second estimation means includes the measured discharge characteristics, the maximum possible number of times replaced by the first replacement means at the time of the previous charge, and the number of measurement executions after the last charge is completed. The electronic sphygmomanometer according to claim 4, wherein the remaining number of times is estimated based on. The replacement control means further includes second average calculation means for calculating the current average current consumption for each blood pressure measurement,
The electronic sphygmomanometer according to claim 5, wherein the second estimating means further estimates the remaining number of times based on the current average current consumption.   The electronic sphygmomanometer according to claim 6, wherein the second estimation unit further estimates the remaining number of times based on an average value of past average current consumption. The replacement control means further includes second estimation means for estimating the remaining number of times representing the remaining measurable number for each blood pressure measurement,
The second estimation means estimates the remaining number of times based on the amount of charge charged in the power storage means during the previous charge, the current consumption charge amount, and the past average consumption charge amount. Item 3. The electronic blood pressure monitor according to Item 2.

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