JP4134234B1 - Electronic blood pressure monitor - Google Patents

Abstract

In an electronic sphygmomanometer, it is possible to accurately determine a wearing state of a cuff even if a power supply voltage fluctuates.
An electronic sphygmomanometer has a reference value determined based on a power supply voltage value after a predetermined time has elapsed from the start of cuff pressurization when a predetermined time has elapsed since the start of pressurization of the cuff. It has the determination means 12 which determines whether it exceeds. If not, blood pressure measurement is discontinued, assuming the cuff is not worn or loosely wrapped. The determination unit 12 includes a reference value calculation unit 21, a reference value storage unit 22, and a comparison unit 23. The reference value calculation means 21 refers to the reference value setting table and obtains a reference value based on the power supply voltage value measured by the power supply voltage value measurement means. The reference value storage unit 22 stores the reference value obtained by the reference value calculation unit 21. The comparison means 23 compares the reference value stored in the reference value storage means 22 with the cuff pressure detected by the pressure detection means.
[Selection] Figure 2

Description

  The present invention relates to an electronic sphygmomanometer, and more particularly to an electronic sphygmomanometer having a function of stopping blood pressure measurement when the cuff is inappropriately worn.

  In general, an electronic sphygmomanometer is configured to apply a cuff pressure (hereinafter referred to as a cuff pressure) during pressurization of a cuff attached to a part of a living body such as an upper arm, a finger, or a wrist, or during decompression of a pressurized cuff. The blood pressure is measured by detecting the fluctuation. In order to measure blood pressure correctly, it is necessary to attach a cuff to the upper arm or the like with an appropriate tightening degree. If the cuff is loosely attached, the compression efficiency of the artery is reduced, and the accuracy of the measurement value is lowered.

  To avoid problems caused by improper wearing of the cuff and damage to the cuff that may occur when the measurement start button of the sphygmomanometer is pressed without wrapping the cuff around the upper arm, etc. In addition, some conventional electronic sphygmomanometers have a function of stopping blood pressure measurement according to the wearing state of the cuff.

  FIG. 10 is a characteristic diagram showing the relationship between the cuff wearing state and the change in cuff pressure during pressurization. As shown in FIG. 10, when the cuff is loosely attached, the rate of increase of the cuff pressure is smaller than when the cuff is normally attached.

  Therefore, a conventional electronic sphygmomanometer having such a measurement stop function measures the cuff pressure when a predetermined time Δt has elapsed from the start of cuff pressurization, and the cuff pressure at that time is lower than a reference value ΔPs. For example, it is determined that the cuff is loosely attached or the cuff is not attached, and the blood pressure measurement is stopped. Here, the reference value ΔPs includes the cuff pressure ΔPm when the cuff wearing state is normal and the cuff pressure when the cuff wearing state is not normal at the time when a predetermined time Δt has elapsed from the start of cuff pressurization. It is set to a value between ΔPm ′.

  For example, it is determined whether or not the cuff pressure has reached a predetermined value when a predetermined time elapses after the pressurizing means for pressurizing the cuff starts to pressurize, and as a result, the cuff pressure is less than or equal to a predetermined value. An electronic sphygmomanometer for a finger is known which operates a pressure reducing means for reducing the pressure of the cuff (see, for example, Patent Document 1). In addition, when the cuff pressure is increased, the amount of change in the cuff pressure is detected, the cuff wearing state is determined based on the detection result, and blood pressure measurement is performed when it is determined that the cuff is not worn on the arm. There is a known electronic blood pressure monitor for arms that interrupts processing (see, for example, Patent Document 2).

JP-A-62-84738 (means for solving (d) problems) Japanese Patent Laid-Open No. 2-114934 ([Means for Solving the Problems])

  However, the above-described conventional electronic blood pressure monitor has the following problems because the reference value for determining the wearing state of the cuff is a fixed value. As this fixed value, (1) a value that does not cause an erroneous determination when the pressurizing means is pressurized at the maximum operating voltage that is the maximum upper limit of the use range of the battery as the power source, and (2) the use range of the battery. Let us consider two values that do not cause a false determination when the pressurizing means is pressurized at the lowest operating voltage that is the lowest limit.

  In the case of (1), if the operating voltage is lowered due to the deterioration of the battery and the pressurizing capacity of the pressurizing means is lowered, the reference value cannot be exceeded even if the cuff is in a normal state. End up. On the other hand, in the case of (2), when the operating voltage is high and the pressurizing capacity of the pressurizing means is high just after battery replacement, the reference value exceeds the reference value even when the cuff is loose or not attached. Therefore, it is determined that the wearing state is normal. That is, in any case, there is a problem in that an erroneous determination is made regarding the wearing state of the cuff.

  An object of the present invention is to provide an electronic sphygmomanometer that can accurately determine the wearing state of a cuff even if the power supply voltage changes in order to eliminate the above-described problems caused by the prior art.

  In order to solve the above-described problems and achieve the object, an electronic sphygmomanometer according to the invention of claim 1 includes a cuff, a pressurizing unit that pressurizes the cuff, a depressurizing unit that depressurizes the cuff, A pressure detection means for detecting pressure, a determination means for determining whether a change in pressure of the cuff detected by the pressure detection means after the start of pressurization of the cuff satisfies a reference value, and the determination means, In an electronic sphygmomanometer comprising: a control unit that stops the pressurizing unit and activates the depressurizing unit when it is determined that the change in pressure of the cuff does not satisfy the reference value. The power supply voltage value measuring means for measuring is further provided, and the reference value is changed according to the power supply voltage value measured by the power supply voltage value measuring means.

  According to a second aspect of the present invention, in the electronic sphygmomanometer according to the first aspect of the invention, the determination unit calculates the reference value based on the power supply voltage value measured by the power supply voltage value measurement unit. A reference value calculating means; and a comparing means for comparing the reference value calculated by the reference value calculating means with the pressure of the cuff detected by the pressure detecting means, wherein the determining means comprises the comparison As a result of comparison by means, if the pressure of the cuff is equal to or lower than the reference value, it is determined that the reference value is not satisfied.

  According to a third aspect of the present invention, in the electronic sphygmomanometer according to the second aspect of the present invention, the determination unit measures a time elapsed since the pressurization unit started pressurizing the cuff. And the determination means satisfies the reference value when the cuff pressure is equal to or less than the reference value when the elapsed time measured by the timing means reaches a predetermined time. It is characterized by not determining.

  According to a fourth aspect of the present invention, in the electronic sphygmomanometer according to the first aspect of the present invention, the power supply voltage value measuring means may be configured such that the power supply voltage value measuring means is a predetermined time after the pressurizing means starts pressurizing the cuff. The power supply voltage value is measured.

  According to the present invention, whether the power supply voltage after battery replacement is high or the power supply voltage is lowered due to battery deterioration, the cuff pressure is appropriate as a reference value for comparing the cuff pressure when determining the cuff attachment state. A value is obtained. Therefore, the wearing state of the cuff can be determined according to the power supply voltage.

  According to the electronic sphygmomanometer according to the present invention, there is an effect that it is possible to accurately determine the wearing state of the cuff even if the power supply voltage fluctuates.

  Exemplary embodiments of an electronic blood pressure monitor according to the present invention will be described below in detail with reference to the accompanying drawings. Note that, in the following description of the embodiments and the accompanying drawings, the same reference numerals are given to the same components, and duplicate descriptions are omitted.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing the overall configuration of the electronic blood pressure monitor according to Embodiment 1 of the present invention. As shown in FIG. 1, the electronic sphygmomanometer includes a cuff 1, a pressure detection unit 2, a pressurization unit 3, a decompression unit 4, a display unit 5, an operation unit 6, and a microcomputer (hereinafter referred to as a microcomputer) 7. Yes. The cuff 1, the pressure detection means 2, the pressurization means 3 and the decompression means 4 are connected by a tube 8.

  Driving voltages for the pressurizing unit 3 and the decompressing unit 4 are supplied from a power source 9. The power source 9 is constituted by a battery. Here, for example, it is assumed that four dry batteries having a nominal voltage of 1.5 volts are connected in series. The electronic sphygmomanometer incorporates a regulator 10 that steps down the power supply voltage of the power supply 9. The drive voltage of the pressure detection means 2 and the microcomputer 7 is supplied from the regulator 10.

  The pressure detection means 2 detects the pressure of the cuff 1. The pressure detection means 2 is comprised by the pressure sensor, for example. The pressurizing means 3 pressurizes the cuff 1 based on the output signal of the microcomputer 7. The pressurizing means 3 is constituted by, for example, a pump that sends a fluid such as air (hereinafter simply referred to as air or the like) to the cuff 1.

  The decompression unit 4 reduces the pressure of the cuff 1 based on the output signal of the microcomputer 7. The decompression means 4 is constituted by, for example, an exhaust valve that exhausts the air or the like in the cuff 1 very slowly and rapidly. The exhaust valve is opened at an opening that allows a slow exhaust when measuring blood pressure, and gradually reduces the cuff 1. Further, the exhaust valve is fully opened at the end of blood pressure measurement and when blood pressure measurement to be described later is stopped, and the cuff 1 is rapidly decompressed. Note that the decompression means 4 may have a configuration including a slow exhaust valve that exhausts air or the like in the cuff 1 at a slow speed, and a quick exhaust valve that exhausts the air quickly.

  The display means 5 displays the maximum blood pressure value and the minimum blood pressure value determined by the microcomputer 7. The display unit 5 includes, for example, a liquid crystal display panel and a control unit that performs display control of the liquid crystal display panel. The display means 5 may be configured to display the pulse rate and time.

  The operation means 6 has various buttons and switches that are operated by the user during blood pressure measurement. For example, a measurement start button also serving as a power button, a user ID button for inputting a user identifier, a switch for setting a pressurization value, a memory button for storing a measurement result, and the like are provided. Yes.

  The microcomputer 7 includes a power supply voltage value measurement unit 11, a determination unit 12, a pressurization control unit 13, a decompression control unit 14, a pulse wave detection unit 15, and a blood pressure value determination unit 16. The power supply voltage value measuring means 11 measures the voltage value of the power supply 9 after a predetermined time has elapsed from the start of pressurization of the cuff 1. The power supply voltage value measuring means 11 is composed of, for example, an analog-digital converter, and converts a power supply voltage value supplied as an analog signal from the power supply 9 into a digital signal.

  Determination means 12, pressurization control means 13, decompression control means 14, pulse wave detection means 15 and blood pressure value determination means 16 are realized by microcomputer 7 executing a blood pressure measurement program. The determination means 12 determines whether or not the pressure of the cuff 1 at the time when a predetermined time has elapsed after the start of pressurization of the cuff 1 satisfies a reference value. The reference value at this time is determined based on the power supply voltage value after a predetermined time has elapsed from the start of pressurization of the cuff 1. The configuration of the determination unit 12 will be described later.

  The pressurization control means 13 performs drive control of the pump constituting the pressurization means 3 based on the pressure value of the cuff 1 detected by the pressure detection means 2. For example, when the pressure of the cuff 1 reaches a predetermined pressure during the pressurization of the cuff 1, the pressurization control means 13 stops the pump. Moreover, the pressurization control means 13 stops a pump, when the pressure of the cuff 1 does not satisfy | fill the reference value as a result of the determination by the determination means 12 mentioned above.

  After the pressurization of the cuff 1 is completed, the decompression control means 14 opens the exhaust valve and exhausts air or the like from the cuff 1 at a low speed. At that time, the pressure reduction control means 14 controls the opening degree of the exhaust valve based on the pressure reduction speed of the pressure of the cuff 1 detected by the pressure detection means 2. In addition, the decompression control unit 14 opens the exhaust valve in response to the notification from the blood pressure value determination unit 16 at the end of blood pressure measurement. Furthermore, when the pressure of the cuff 1 does not satisfy the reference value as a result of the determination by the determination unit 12 described above, the decompression control unit 14 fully opens the exhaust valve.

  The pulse wave detection means 15 detects a pulse wave component included in the output signal of the pressure detection means 2 when the cuff 1 is depressurized at a slow speed. Based on the pulse wave component detected by the pulse wave detection unit 15, the blood pressure value determination unit 16 determines a maximum blood pressure value and a minimum blood pressure value by, for example, a blood pressure determination algorithm based on a known oscillometric method. The determined blood pressure value is displayed on the display means 5. In addition, when the blood pressure value determining unit 16 determines the blood pressure value, the blood pressure value determining unit 16 notifies the decompression control unit 14 of the end of measurement in order to fully open the exhaust valve.

  FIG. 2 is a block diagram illustrating a configuration of the determination unit 12. As shown in FIG. 2, the determination unit 12 includes a reference value calculation unit 21, a reference value storage unit 22, and a comparison unit 23. Based on the power supply voltage value measured by the power supply voltage value measuring means 11, the reference value calculating means 21 determines a reference value based on a reference value setting table, for example, as described below. This reference value setting table may be stored in a non-volatile memory built in the microcomputer 7 or may be described in a blood pressure measurement program executed by the microcomputer 7.

FIG. 3 is a chart showing an example of the reference value setting table, and FIG. 4 is a characteristic diagram showing an example of the relationship between the power supply voltage value and the reference value. As shown in these drawings, although not particularly limited, for example, the reference value when the power supply voltage is less than 4.0 volts is P ₄ mmHg, and the reference value when the power supply voltage is 6.0 volts or more is P ₆ mmHg. Has been. (As shown in FIG. 4, P ₄ and P ₆ have a relationship of P ₄ <P _6. ) And when the power supply voltage is 4.0 volts or more and less than 6.0 volts, the reference value is If the power supply voltage is V _BAT volts, the following equation is obtained.
Reference value = (V _BAT −4) × (P ₆ −P ₄ ) / 2 + P ₄

However, here, the case where the minimum operating voltage of the electronic blood pressure monitor of the embodiment is 4.0 volts is taken as an example. Therefore, the critical value of the power supply voltage value when setting the reference value varies depending on the minimum operating voltage of the electronic sphygmomanometer. Further, the relationship between the power supply voltage value and the reference value when the power supply voltage is 4.0 volts or more and less than 6.0 volts is not limited to the above formula and can be variously changed. For example, in this power supply voltage range, the reference value may change stepwise from P ₄ mmHg to P ₆ mmHg, or may change in a curved shape.

  The reference value storage unit 22 stores the reference value obtained by the reference value calculation unit 21. The reference value storage means 22 is constituted by a register, for example. The comparison unit 23 compares the reference value stored in the reference value storage unit 22 with the pressure of the cuff 1 detected by the pressure detection unit 2. The configuration of the comparison means 23 is as follows.

  FIG. 5 is a block diagram illustrating a configuration of the comparison unit 23. As shown in FIG. 5, the comparison unit 23 includes a timer unit 31 and a comparison unit 32. The timer 31 measures the time that has elapsed since the pressurization unit 3 started to pressurize the cuff 1. The time measuring unit 31 is configured by, for example, a timer that starts measuring time when the pressurization of the cuff 1 is started. This timer notifies the comparison unit 32 when a predetermined time has elapsed from the start of timing.

  When the comparison unit 32 receives a notification of the elapse of a predetermined time from the timer, the comparison unit 32 receives the detection value of the cuff pressure from the pressure detection unit 2, receives the reference value from the reference value storage unit 22, and compares the cuff pressure with the reference value. Do. When the cuff pressure is lower than the reference value, the comparison unit 32 outputs a signal for stopping the driving of the pump (pressurization unit 3) to the pressurization control unit 13 as a determination result by the determination unit 12 described above. Then, a signal for fully opening the exhaust valve (decompression unit 4) is output to the decompression control unit 14.

  FIG. 6 is a flowchart showing a blood pressure measurement procedure of the electronic sphygmomanometer according to the first embodiment of the present invention. As shown in FIG. 6, when the measurement start button or the like of the operation unit 6 is operated by the user and the blood pressure measurement process is started, the pressurization control unit 13 first drives the pressurization unit 3 to move the cuff 1. Pressurization is started (step S1). When the pressurization of the cuff 1 is started, the power supply voltage value measuring unit 11 measures the voltage value of the power supply 9 after a predetermined time has elapsed (step S2).

  Next, the reference value calculation means 21 refers to the reference value setting table shown in FIG. 3 and obtains a reference value based on the power supply voltage value obtained in step S2. Then, the reference value calculation means 21 stores the reference value in the reference value storage means 22 (step S3). Next, a flag F (hereinafter referred to as a timer flag) F indicating the operation state of the timer is set to an initial state (step S4). The initial state of the timer flag F is a state in which the flag is lowered, and the value at that time is “0”.

  Next, the process proceeds to step S5, where the wearing state of the cuff 1 is determined. However, since not so much time has elapsed since the start of pressurization of the cuff 1, and the timing for performing the determination has not been reached, it is normal. Is continued (step S5: No). The determination procedure in step S5 will be described later. Next, it is determined whether or not the pressure at which the pressurization of the cuff 1 should be stopped, that is, the stop pressure has been reached (step S6). Even at this stage, not much time has elapsed since the start of pressurization of the cuff 1, and the stop pressure has not been reached (step S6: No). Accordingly, the pressurization control of the cuff 1 is continued (step S7). Then, the process returns to step S5.

  When the determination timing of the wearing state of the cuff 1 is reached while the pressurization control of the cuff 1 is continued, the determination is performed (step S5). Here, it is assumed that the wearing state of the cuff 1 is good (step S5: No). Therefore, the normal pressurizing operation is continued. When the stop pressure is reached (Step S6: Yes), the pressurization control means 13 stops the pressurization of the cuff 1 by the pressurization means 3 (Step S8). At the same time, the decompression control means 14 starts the slow exhaust by the decompression means 4 and starts decompressing the cuff 1 (step S9). Then, the pulse wave detection means 15 and the blood pressure value determination means 16 perform blood pressure measurement by a known blood pressure determination algorithm during the slow depressurization of the cuff 1 (step S10).

  The determination of the maximum blood pressure value and the minimum blood pressure value ends the blood pressure measurement, but here, it is immediately after the start of depressurization of the cuff 1, and neither blood pressure value is determined. Therefore, the blood pressure measurement is not finished (step S11: No), and the pressure reduction control of the cuff 1 is continued (step S12). And it returns to step S10 and blood pressure measurement is continued. When the maximum blood pressure value and the minimum blood pressure value are determined during the blood pressure measurement, the blood pressure measurement ends (step S11: Yes). Next, the decompression control means 14 fully opens the exhaust valve of the decompression means 4 to rapidly decompress the cuff 1 (step S14), and the blood pressure measurement ends normally.

  On the other hand, when the wearing state of the cuff 1 is loose or not attached at step S5 (step S5: Yes), the pressurization control unit 13 stops the pressurization of the cuff 1 by the pressurizing unit 3 (step S5). S13). Then, the decompression control unit 14 fully opens the exhaust valve of the decompression unit 4 to perform rapid decompression of the cuff 1 (step S14), and stops the blood pressure measurement.

  FIG. 7 is a flowchart showing the cuff attachment state determination procedure in step S5 of FIG. As shown in FIG. 7, when the cuff wearing state determination process is started following step S4 in FIG. 6, it is first determined whether or not the timer flag F is set (step S21). The value when the timer flag F is set is “1”. Here, since the value of the timer flag F is set to “0” in step S4, the value of the timer flag F is not “1” (step S21: No).

  The timer 31 starts timing when the value of the timer flag F is “0”. Therefore, following step S21, the time measuring unit 31 sets the timer value t to “0” and starts measuring time from there (step S22). Next, since the time is being measured, the value of the timer flag F is set to “1” indicating that the time is being measured (step S23). And it progresses to step S6 of FIG. 6, and pressurization control is continued.

  When the determination process of the cuff wearing state is started again after step S4 in FIG. 6, the value of the timer flag F is now “1” (step S21: Yes). In this state, if the timer value t has not reached the preset value a (step S24: No), the process proceeds to step S6 in FIG. 6 and pressurization control is continued.

  Again, following step S4 in FIG. 6, the cuff wearing state determination process is started, and when the timer value t that is being timed reaches a preset value a (step S24: Yes), the comparison unit 32. Compares the detected value of the cuff pressure at that time with the reference value obtained in step S3 of FIG. And the comparison part 32 determines whether a cuff pressure is smaller than a reference value (step S25).

  If the cuff pressure is greater than or equal to the reference value (step S25: No), the comparison unit 32 determines that the cuff is normally wound and proceeds to step S6 in FIG. And pressurization control is continued. On the other hand, if the cuff pressure is smaller than the reference value (step S25: Yes), the process proceeds to step S13 in FIG. 6 and blood pressure measurement is stopped.

Embodiment 2. FIG.
While the electronic sphygmomanometer according to the first embodiment measures blood pressure during the slow depressurization of the cuff 1, the electronic sphygmomanometer according to the second embodiment measures blood pressure while the cuff 1 is pressurized. It is. Therefore, the configuration of the electronic sphygmomanometer according to the second embodiment is different from the configuration of the electronic sphygmomanometer according to the first embodiment in the following points. In addition, the same code | symbol is attached | subjected about the structure similar to Embodiment 1, and the overlapping description is abbreviate | omitted.

  FIG. 8 is a block diagram showing an overall configuration of an electronic sphygmomanometer according to the second embodiment of the present invention. As shown in FIG. 8, in the electronic sphygmomanometer according to the second embodiment, a quick exhaust unit 41 is provided as a decompression unit in place of the decompression unit 4 of the first embodiment. The quick exhaust means 41 is connected to the cuff 1 by a tube 8. Further, instead of the decompression control means 14 of the microcomputer 7, the microcomputer 42 is provided with an exhaust control means 43 as a decompression control means.

  The quick exhaust means 41 rapidly exhausts the air in the cuff 1 based on the output signal of the microcomputer 42 at the end of the blood pressure measurement and when the blood pressure measurement to be described later is stopped. The rapid exhaust means 41 is constituted by, for example, an exhaust valve. The driving voltage for the quick exhaust means 41 is supplied from the power supply 9. The exhaust control unit 43 is realized by the microcomputer 42 executing the blood pressure measurement program.

  In the second embodiment, when the blood pressure value determining means 16 determines the blood pressure value, it notifies the pressurization control means 13 to stop the pump and notifies the exhaust control means 43 to fully open the exhaust valve. I do. When the blood pressure measurement is stopped, the determination unit 12 notifies the pressurization control unit 13 to stop the pump and notifies the exhaust control unit 43 to fully open the exhaust valve. When the exhaust control unit 43 receives the full open notification from the blood pressure value determination unit 16 or the determination unit 12, the exhaust control unit 43 opens the exhaust valve fully. When the pressurization control unit 13 receives a pump stop notification from the blood pressure value determination unit 16 or the determination unit 12, the pressurization control unit 13 stops driving the pump.

  FIG. 9 is a flowchart showing a blood pressure measurement procedure of the electronic sphygmomanometer according to the second embodiment of the present invention. As shown in FIG. 9, in the blood pressure measurement procedure of the electronic sphygmomanometer according to the second embodiment, steps S31 to S35 are the same as steps S1 to S5 of the first embodiment. Therefore, in the description from step S1 to step S5 in FIG. 6, step S1, step S2, step S3, step S4, and step S5 shall be read as step S31, step S32, step S33, step S34, and step S35, respectively. A duplicate description is omitted.

  When the blood pressure measurement process is started, first, processes from step S31 to step S34 are sequentially performed. After the value of the timer flag F is set to “0” in step S34, the attachment state of the cuff 1 is determined. Since the timing for performing the operation has not been reached, the normal pressurizing operation is continued (step S35: No). Then, the pulse wave detection means 15 and the blood pressure value determination means 16 measure blood pressure by a known blood pressure determination algorithm during the pressurization of the cuff 1 (step S36).

  The determination of the maximum blood pressure value and the minimum blood pressure value ends the blood pressure measurement, but here, not much time has elapsed since the start of pressurization of the cuff 1, and no blood pressure value has been determined. Therefore, the blood pressure measurement does not end (step S37: No), and the pressurization control of the cuff 1 is continued (step S38). And it returns to step S35 and blood pressure measurement is continued.

  When the maximum blood pressure value and the minimum blood pressure value are determined during the blood pressure measurement, the blood pressure measurement ends (step S37: Yes). When the blood pressure measurement is completed, the pressurization control means 13 stops the pressurization of the cuff 1 by the pressurization means 3 (step S39). Then, the exhaust control means 43 fully opens the exhaust valve of the quick exhaust means 41 to rapidly depressurize the cuff 1 (step S40), and the blood pressure measurement is normally completed.

  On the other hand, when the attachment state of the cuff 1 is loose or not attached at Step S35 (Step S35: Yes), the pressurization control means 13 stops the pressurization of the cuff 1 by the pressurization means 3 (Step S35). S39). Then, the exhaust control unit 43 fully opens the exhaust valve of the quick exhaust unit 41 to perform rapid pressure reduction of the cuff 1 (step S40), and stops blood pressure measurement.

  The procedure for determining the cuff wearing state in step S35 is the same as described in the first embodiment with reference to FIG. However, in the description related to FIG. 7, step S3, step S4, step S6, and step S13 are read as step S33, step S34, step S36, and step S39, respectively, and FIG. 6 is read as FIG.

  As described above, according to the first or second embodiment, whether the power supply voltage after battery replacement is high or the power supply voltage is reduced due to battery deterioration, according to the power supply voltage from the reference value setting table. Since an appropriate reference value is obtained, the wearing state of the cuff 1 can be determined according to the power supply voltage. Therefore, even if the power supply voltage fluctuates, it is possible to accurately determine the wearing state of the cuff 1. In addition, since it is possible to accurately determine the wearing state of the cuff 1, not only deterioration of blood pressure measurement accuracy can be avoided, but also damage to the cuff 1 can be prevented.

  As described above, the electronic sphygmomanometer according to the present invention is useful for an electronic sphygmomanometer of a type in which a user wears a cuff on his / her upper arm or the like to measure blood pressure, and in particular, before the blood pressure measurement is started, It is suitable for an electronic sphygmomanometer having a function of judging the wearing state of the.

It is a block diagram which shows the whole structure of the electronic blood pressure monitor concerning Embodiment 1 of this invention. It is a block diagram which shows the structure of the determination means of the electronic blood pressure monitor concerning Embodiment 1 of this invention. It is a table | surface which shows an example of the reference value setting table of the electronic blood pressure monitor concerning Embodiment 1 of this invention. It is a characteristic view which shows an example of the relationship between the power supply voltage value and reference value of the electronic blood pressure monitor concerning Embodiment 1 of this invention. It is a block diagram which shows the structure of the comparison means of the electronic blood pressure monitor concerning Embodiment 1 of this invention. It is a flowchart which shows the blood-pressure measurement procedure of the electronic sphygmomanometer concerning Embodiment 1 of this invention. It is a flowchart which shows the cuff wearing state determination procedure of the electronic blood pressure monitor concerning Embodiment 1 of this invention. It is a block diagram which shows the whole structure of the electronic blood pressure meter concerning Embodiment 2 of this invention. It is a flowchart which shows the blood-pressure measurement procedure of the electronic sphygmomanometer concerning Embodiment 2 of this invention. It is a characteristic view which shows the relationship between the mounting state of a cuff and the change of the cuff pressure during pressurization.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cuff 2 Pressure detection means 3 Pressurization means 4 Pressure reduction means 9 Power supply 11 Power supply voltage value measurement means 12 Judgment means 13 Pressure control means 14 Pressure reduction control means 21 Reference value calculation means 23 Comparison means 31 Timekeeping part 41 Quick exhaust means 43 Exhaust Control means

Claims (4)

A cuff, a pressurizing unit that pressurizes the cuff, a depressurizing unit that depressurizes the cuff, a pressure detecting unit that detects the pressure of the cuff, and the pressure detecting unit that is detected after the pressurization of the cuff is started. A determination unit that determines whether or not a change in pressure of the cuff satisfies a reference value; and the pressurizing unit when the determination unit determines that the change in pressure of the cuff does not satisfy the reference value And an electronic sphygmomanometer comprising a control means for operating the decompression means,
A power supply voltage value measuring means for measuring the power supply voltage value,
An electronic sphygmomanometer, wherein the reference value is changed according to a power supply voltage value measured by the power supply voltage value measuring means. The determination means includes
Reference value calculating means for calculating the reference value based on the power supply voltage value measured by the power supply voltage value measuring means;
Comparing means for comparing the reference value calculated by the reference value calculating means with the pressure of the cuff detected by the pressure detecting means,
The electronic sphygmomanometer according to claim 1, wherein the determination unit determines that the reference value is not satisfied when the pressure of the cuff is equal to or lower than the reference value as a result of the comparison by the comparison unit. . The determination unit further includes a time measuring unit that measures an elapsed time from when the pressurization of the cuff is started by the pressurization unit,
The determining means determines that the reference value is not satisfied when the elapsed time measured by the time measuring means reaches a predetermined time and the pressure of the cuff is not more than the reference value. The electronic sphygmomanometer according to claim 2.   The electronic sphygmomanometer according to claim 1, wherein the power supply voltage value measuring unit measures a power supply voltage value after a predetermined time has elapsed since the pressurizing unit started pressurizing the cuff.

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