JP6807689B2 - Cuff pressure control device, its control method, and biometric information measurement device - Google Patents

Description

The present invention relates to a cuff pressure control device, a control method thereof, and a biological information measuring device, and more particularly to an abnormality detection technique for the device.

In a biological information measuring device for measuring pulse waves and blood pressure, a band-shaped cuff with a built-in airbag is attached to the measurement site of the person to be measured, and the measurement site is pressurized by supplying air to the airbag with a pump. There are known ones that measure blood pressure. Specifically, the air supply / exhaust path between the pump and the airbag is branched and connected to the pressure sensor, and the pressure change in the path due to the pulsation of the pressurized part is converted into an electric signal by the pressure sensor. Measure the wave.

In such a biological information measuring device, pressurization (air supply) control of the cuff is performed based on the output of the pressure sensor. Therefore, if an abnormality occurs in the pressure sensor, proper pressurization control cannot be performed, and there is a possibility that the pressure sensor may be pressurized at a pressure higher than necessary or may be pressurized for a longer period than necessary. Further, even if the pressure sensor is normal, if there is an abnormality in the control circuit of the pump, the pump, or the gas flow path, the pressure control of the cuff cannot be normally performed. Therefore, it is necessary to detect abnormalities and failures of components related to pressure control of the cuff, including abnormalities and failures of the pressure sensor.

Patent Document 1 describes a method in which a pressure sensor has a double configuration and one of the abnormalities is detected by comparing the outputs of the two.

Further, Patent Document 2 describes a configuration in which a sphygmomanometer using one pressure sensor detects an abnormality of the pressure sensor using a tank capable of measuring the internal pressure with the pressure sensor. Specifically, the drive time and drive voltage of the pump for supplying air to the tank from 0 mmHg until the output of the pressure sensor reaches a specific pressure (70 mmHg) are stored. Then, if the difference between the output of the pressure sensor when the tank is supplied with air with the stored drive time and drive voltage and 70 mmHg during the initialization process at the time of blood pressure measurement is equal to or greater than the threshold value, it is determined that the pressure sensor is abnormal.

Japanese Patent No. 2965996 Japanese Unexamined Patent Publication No. 2011-97977

However, in the configuration of Patent Document 1, it is necessary to provide two systems of a pressure sensor and a circuit (for example, an A / D converter or an amplifier) required for measurement in order to detect an abnormality of the pressure sensor, which is disadvantageous in terms of cost and miniaturization of the device. there were.

Further, in the configuration of Patent Document 2, it is necessary to provide a tank, a valve for switching between a flow path for supplying air to the cuff and a flow path for supplying air to the tank, and a valve control circuit, which is also a cost and an apparatus. It is disadvantageous in miniaturization of. Further, since it is necessary to switch the flow path and perform the air supply operation in order to detect the sensor abnormality at the time of blood pressure measurement, the time required for the measurement becomes long.

The present invention has been made in view of such problems of the prior art, and is a cuff pressure control device capable of detecting an abnormality in a configuration related to cuff pressure control by a method advantageous in terms of miniaturization and cost of the device and a cuff pressure control device thereof. An object of the present invention is to provide a control method and a biological information measuring device.

The above-mentioned purpose is from a pump for supplying air to the airbag of the cuff, a detecting means for outputting a signal indicating the internal pressure of a gas flow path connected to the inside of the airbag, and a detecting means during air supply to the airbag. The detection of the intensity level of the signal component contained in the output signal of the above due to the operation of the pump and the comparison between the intensity level and the predetermined threshold value are repeatedly executed, and the output signal from the detection means is caused by the operation of the pump. When it is not determined that the signal component to be used is contained at an intensity level equal to or higher than a predetermined threshold value , a determination means for determining an abnormality of the device and a determination means.
The above-mentioned object is achieved by a cuff pressure control device , which comprises, when the determination means determines an abnormality of the device, a control means for stopping the air supply by the pump and starting the exhaust of the cuff .

With such a configuration, according to the present invention, a cuff pressure control device capable of detecting an abnormality in the configuration related to cuff pressure control, a control method thereof, and biometric information by a method advantageous in terms of miniaturization and cost of the device. A measuring device can be provided.

It is a block diagram which shows the functional structure example of the sphygmomanometer as an example of the cuff pressure control device which concerns on embodiment of this invention. It is a flowchart about the operation of the sphygmomanometer which concerns on embodiment. It is a figure which shows the example of the signal waveform of the sphygmomanometer which concerns on embodiment. It is a figure which shows the frequency spectrum of the noise signal shown in FIG.

Hereinafter, the present invention will be described in detail with reference to the drawings based on an exemplary embodiment. In the following, the configuration in which the cuff pressure control device according to the embodiment of the present invention is applied to a sphygmomanometer as an example of a biological information measuring device will be described. However, the cuff pressure control device according to the present invention is not limited to a sphygmomanometer, but measures biological information using an airbag attached to a person to be measured, such as a pulse wave meter and a blood flow meter, and supplied with a pump. It is applicable to biometric information measuring devices.

● (Structure of blood pressure monitor)
FIG. 1 is a block diagram showing a functional configuration example of the sphygmomanometer 150 according to the embodiment. The sphygmomanometer 150 measures blood pressure by an oscillometric method using a cuff 10.
The cuff 10 has an airbag 11 inside, and an air hose H is connected to the airbag 11. The cuff 10 is attached to the sphygmomanometer 150 by attaching the connector provided at one end of the air hose H to the air connector 24 of the sphygmomanometer 150. In the sphygmomanometer 150, the pressure sensor 12, the constant discharge valve 14, the rapid discharge valve 16, and the pump 18 are connected to the air connector 24 by a common gas flow path R. Therefore, the inside of the airbag 11 is connected to the gas flow path R inside the sphygmomanometer through the air hose H and the air connector 24.

The pressure sensor 12 is a pressure-electric conversion sensor using, for example, a piezo element, and outputs an electric signal indicating the internal pressure of a gas flow path connected to the inside of the airbag 11. The electric signal (sensor output signal) output by the pressure sensor 12 is sampled at a predetermined frequency by the AD converter 22 and converted into digital data.

The operation of the constant discharge valve 14, the rapid discharge valve 16, and the pump 18 is controlled by the cuff control unit 20 according to the control of the main control unit 30.
The constant exhaust valve 14 is an exhaust valve for exhausting air from the airbag 11 at a constant flow rate, and the opening degree can be controlled stepwise to control the exhaust flow rate. The rapid exhaust valve 16 is an exhaust valve for rapidly exhausting air from the airbag 11. It is not necessary to control the exhaust flow rate by the sudden exhaust valve 16, and the exhaust valve may be capable of controlling two states, fully closed and fully open. The cuff control unit 20 starts the operation of the pump 18 at the start of measurement, and supplies air to the cuff 10 (airbag 11) to pressurize the pump 18. When the cuff 10 (airbag 11) is supplied with air from the pump 18 to pressurize the cuff 10, the cuff control unit 20 controls the constant discharge valve 14 and the rapid discharge valve 16 to be fully closed. When the cuff pressure reaches the target value, the cuff control unit 20 first stops the pump 18 and opens the constant exhaust valve 14, and if necessary, the exhaust flow rate by the constant exhaust valve 14 so that the cuff pressure decreases at a predetermined rate. To adjust. Further, when the blood pressure value is determined by the main control unit 30, the cuff control unit 20 further opens the rapid discharge valve 16. The cuff control unit 20 operates according to the control of the main control unit 30.

In the present embodiment, for ease of explanation and understanding, one cuff 10 is connected to the sphygmomanometer 150, but a plurality of cuffs 10 may be connected. When a plurality of cuffs 10 are connected, in principle, the same number of air connectors 24, pressure sensors 12, constant discharge valves 14, rapid discharge valves 16 and pumps 18 are provided. On the other hand, it is not always necessary to provide the same number of cuff control units 20 and AD converters 22 as the cuffs 10.

The output signal (sensor output signal) of the pressure sensor 12 is digitized by the AD converter 22 and supplied to the pump noise extraction filter 50, the pulse wave signal extraction filter 51, and the pressure signal extraction filter 52.

The pump noise extraction filter 50 extracts a signal component caused by the operation of the pump 18 superimposed on the sensor output signal, and outputs the noise signal to the main control unit 30. Since the signal component caused by the operation of the pump 18 has been conventionally treated as a noise signal, it is also referred to as a pump noise component or a noise signal in this specification for convenience.
The pulse wave signal extraction filter 51 (biological signal extraction means) extracts a volume pulse wave signal component (hereinafter, simply referred to as a pulse wave signal component) from the sensor output signal and outputs it to the main control unit 30.
The pressure signal extraction filter 52 removes a pump noise component and a pulse wave signal component from the sensor output signal and outputs the pump noise component and the pulse wave signal component to the main control unit 30.

All of these filters can be realized by a filter having a frequency characteristic that allows the band of the signal component to be extracted to pass through and blocks or significantly attenuates other bands. For example, the frequency of the signal component (pump noise component) superimposed on the sensor output signal due to the operation of the pump 18 depends on the mechanism and the operating frequency of the pump 18. Therefore, a filter that passes through a frequency band according to the type and operating frequency of the pump 18 to be used, for example, a low-cut or high-pass filter can be used as the pump noise extraction filter 50. If the air supply speed of the pump 18 is constant, the frequency of the pump noise component is also constant, so that the frequency characteristic of the pump noise extraction filter 50 may be fixed. For example, when the pump 18 is a positive displacement reciprocating pump (diaphragm pump, plunger pump, piston pump, etc.), the frequency of the pump noise component can be obtained as the number of diaphragms used × the operating frequency.

Further, the pulse wave signal extraction filter 51 can be realized by a band pass filter that passes through a general pulse frequency. Since the frequency band of the pulse wave measured at the limbs and the pulse wave measured at the toes are different, it is possible to switch the band pass filter with the frequency characteristics according to the measurement site, or the frequency of the filter. The characteristics can be changed and configured.
The pressure signal extraction filter 52 can be configured by a low-pass filter that removes AC components such as pump noise components and pulse waves from the sensor output signal.

The main control unit 30 includes, for example, one or more programmable processors (MPUs) and a memory, and executes a program stored in the memory in the MPU to control the operation of each part of the sphygmomanometer 150. Realize the function. Information used for executing the program (various constants, setting values, etc.) may also be stored in the memory. Although the pump noise extraction filter 50, the pulse wave signal extraction filter 51, and the pressure signal extraction filter 52 are described as separate configurations from the main control unit 30 in FIG. 1, the program is executed by the MPU of the main control unit 30. By doing so, the functions of these filters may be realized.

The main control unit 30 acquires a noise signal, a pulse wave signal, and a pressure signal, and uses the pressure signal to control the operation of the pump 18, the constant discharge valve 14, and the rapid discharge valve 16 through the cuff control unit 20. Further, the main control unit 30 determines the blood pressure value based on the value of the pressure signal when the amplitude of the pulse wave signal satisfies a specific condition by the oscillometric method. Further, the main control unit 30 determines the operating state of the pressure sensor 12 based on the noise signal.

The operation unit 60 is, for example, a key, a switch, a button, or the like, and receives instructions and settings from the user. For example, a power button / switch, a switch / button for instructing the start of blood pressure measurement, a switch / button for instructing the stop of blood pressure measurement during execution, and the like are included. When the display unit 70 has a touch panel, the combination of the GUI display and the touch panel on the display unit 70 also constitutes a part of the operation unit 60. The operation of the operation unit 60 is monitored by the main control unit 30, and the main control unit 30 executes an operation according to the detected operation.

The display unit 70 is composed of, for example, a dot matrix type display such as an LCD, an LED lamp, or the like, and displays the operating state, measurement result, guidance, and the like of the sphygmomanometer 150 under the control of the main control unit 30. The sphygmomanometer 150 may be provided with another output device such as a speaker or a printer in place of the display unit 70 or in addition to the display unit 70.

The storage unit 80 is a storage device that stores information related to measurement data (information on the person to be measured, etc.), measurement data, and the like, and may be, for example, a non-volatile memory. The storage unit 80 may be configured to use a recording medium that is removable from the sphygmomanometer 150, such as a memory card. At least one copy of the program executed by the MPU of the main control unit 30 and the information used for executing the program may be stored in the storage unit 80.

The external interface (I / F) 90 is, for example, a wired and / or wireless communication interface for connecting an external device using the measured blood pressure value to the sphygmomanometer 150. The sphygmomanometer 150 can communicate with an external device through the external interface (I / F) 90. Further, power may be supplied from an external device through the external interface (I / F) 90.

In the present embodiment, the main control unit 30, the cuff control unit 20, the pump 18, the constant discharge valve 14, the rapid discharge valve 16, the pressure sensor 12, the AD converter 22, and the pump noise extraction filter 50 constitute the cuff pressure control device. However, not all of these configurations are required for abnormality detection of the cuff pressure control device.

● (Operation of blood pressure monitor)
FIG. 2 is a flowchart for explaining the blood pressure measurement process of the sphygmomanometer 150 of the present embodiment. For example, when the start of the blood pressure measurement operation is instructed by pressing the start button or the like of the operation unit 60, the main control unit 30 instructs the cuff control unit 20 to start supplying air to the cuff 10 in S101.

The cuff control unit 20 operates the pump 18 in response to this instruction. As a result, air supply to the airbag 11 is started. During air supply, the cuff control unit 20 controls both the constant discharge valve 14 and the rapid discharge valve 16 in a fully closed state. From the pressure sensor 12, in addition to the static internal pressure (cuff pressure) of the airbag 11, the pressure fluctuation due to the pulse wave at the cuff mounting portion and the air supply operation of the pump during the operation of the pump 18 (during air supply) are further performed. An electric signal in which the pressure fluctuation (noise component) due to the above is superimposed is obtained.

The output signal of the pressure sensor 12 is digitized by the AD converter 22, and then supplied to the pump noise extraction filter 50, the pulse wave signal extraction filter 51, and the pressure signal extraction filter 52. The pump noise extraction filter 50 and the pulse wave signal extraction filter 51 supply the pump noise component (noise signal) and the volume pulse wave component (pulse wave signal) extracted from the sensor output signal to the main control unit 30. The pressure signal extraction filter 52 supplies the pressure signal obtained by removing the pump noise component and the volume pulse wave component from the sensor output signal to the main control unit 30.

In S103, the main control unit 30 determines whether or not the cuff pressure represented by the pressure signal has reached a predetermined target value, and if it is determined that the cuff pressure has reached S105, if it is not determined that the cuff pressure has been reached, the process proceeds to S121. Proceed with each process.

In S121, the main control unit 30 determines whether or not the intensity level of the noise signal is equal to or higher than a predetermined threshold value. If not, the process proceeds to S123. For example, the main control unit 30 analyzes the noise signal by frequency, calculates the peak intensity level existing in the vicinity of the frequency of the pump noise component determined according to the operating frequency of the pump 18 at the time of air supply as the intensity level of the noise signal, and calculates the threshold value. Compare with. The threshold value is a pump noise component superimposed on the sensor output signal (output signal of the AD converter 22) after AD conversion when the pump 18, the pressure sensor 12, and the AD converter 22 are operating normally and supplying air. Can be determined in advance based on the strength level of. For example, a value of 80% to 90% of the average value of the intensity level of the pump noise component measured during normal operation can be used as the threshold value.

In S123, the main control unit 30
-Pump 18 is not operating normally-Pressure sensor 12 is not operating normally-AD converter 22 (or any of the other circuits in the signal path from the output of the pressure sensor 12 to the main control unit 30) Is not operating normally, etc., in the path from the main control unit 30 to the main control unit 30 via the cuff control unit 20, the pump 18, the gas flow path R, the pressure sensor 12, and the AD converter 22. ), It is determined that some kind of failure or abnormality has occurred, and the blood pressure measurement is forcibly terminated.

Specifically, the main control unit 30 is attached to the cuff control unit 20.
・ Pump 18 operation stop (air supply stop)
-Instruct the constant discharge valve 14 and the rapid discharge valve 16 to be fully opened.
In this way, when the pressure sensor 12 is abnormal, it can be detected by the S121 even if the pump 18 and other circuits are not out of order.

In S125, the cuff control unit 20 stops the operation of the pump 18 according to the instruction of the main control unit 30, and makes the constant discharge valve 14 and the rapid discharge valve 16 fully open.

In S127, the main control unit 30 displays a message on the display unit 70, outputs an alarm sound, for example, notifies the device abnormality, and ends the blood pressure measurement process. If the main control unit 30 instructs the cuff control unit 20 in S123, the process may proceed to S127 without waiting for the operation of the cuff control unit 20 to be completed.

On the other hand, when it is determined in S103 that the cuff pressure has reached the target value, the main control unit 30 instructs the cuff control unit 20 to stop supplying air in S105. Alternatively, even if it is not determined in S103 that the cuff pressure represented by the pressure signal has reached a predetermined target value, the process proceeds to S105 when it is confirmed that the pulse wave signal has continuously disappeared for a certain period of time. You may. The cuff control unit 20 stops the operation of the pump 18 in response to the instruction to stop the air supply.

Next, the main control unit 30 starts the blood pressure determination process. The blood pressure determination process can be performed by any known method based on the oscillometric method, but a feasible example will be described below. First, in S107, the main control unit 30 instructs the cuff control unit 20 to open the constant discharge valve 14 with an opening degree corresponding to a predetermined target value (for example, 5 mmHg / sec) of the decompression rate. The cuff control unit 20 opens the constant discharge valve 14 with an opening degree (flow rate) according to an instruction. As a result, the exhaust from the airbag 11 of the cuff 10 starts.

In S107, it is not necessary for the main control unit 30 to explicitly instruct the cuff control unit 20 of the opening degree of the constant discharge valve 14. For example, the cuff control unit 20 may operate so as to open the constant discharge valve 14 at a specific opening degree in response to the opening instruction of the constant discharge valve 14 first instructed after the air supply is stopped.

When the main control unit 30 instructs the opening of the constant discharge valve 14, the main control unit 30 starts the blood pressure value determination process based on the pulse wave signal and the pressure signal. For example, the blood pressure value can be determined by a known method such that the pressure value indicated by the pressure signal at the time when the magnitude of the amplitude of the pulse wave signal changes significantly is defined as the systolic and diastolic blood pressure. The provisional blood pressure value may be determined during depressurization, and the final blood pressure value may be determined after the decompression treatment is completed.

In S109, the main control unit 30 monitors the pressure signal while executing the blood pressure determination process, and determines whether or not the decompression rate is within the target range. Specifically, the main control unit 30 determines whether or not the cuff pressure is within the target range of the target value ± the permissible error obtained from the elapsed time after opening the constant discharge valve 14 and the target decompression rate.

If the decompression rate (cuff pressure) is determined to be within the target range, the main control unit 30 advances the process to S111 and determines whether or not the blood pressure determination process is completed. If it is determined that the blood pressure determination process is completed, the main control unit 30 advances the process to S113, and if it is not determined that the blood pressure determination process is completed, the process returns to S109. As described above, the blood pressure determination process may determine a provisional blood pressure value.

In S113, the main control unit 30 instructs the cuff control unit 20 to fully open both the constant discharge valve 14 and the rapid discharge valve 16. In response to this, the cuff control unit 20 controls the constant discharge valve 14 and the rapid discharge valve 16 in a fully open state.
The main control unit 30 displays, for example, a measured value such as a blood pressure value determined during decompression or after S113 on the display unit 70, and ends the blood pressure measurement process.

On the other hand, when the decompression rate (cuff pressure) is not determined to be within the target range in S109, the main control unit 30 adjusts the opening degree of the constant discharge valve 14 in S115 to S119. Specifically, in S115, the main control unit 30 determines whether or not the decompression rate (cuff pressure) is lower than the target range, and if it is determined to be low, the process proceeds to S119, and if it is not determined to be low, the process proceeds to S117. To proceed.

In S119, the main control unit 30 instructs the cuff control unit 20 to increase the opening degree of the constant exhaust valve 14 in order to increase the exhaust flow rate. Further, in S117, the main control unit 30 instructs the cuff control unit 20 to reduce the opening degree of the constant exhaust valve 14 in order to reduce the exhaust flow rate. The cuff control unit 20 increases or decreases the opening degree of the constant discharge valve 14 by a predetermined ratio according to the instruction of the main control unit 30. Then, the main control unit 30 returns the process to S109.

In the conventional sphygmomanometer, the pump noise component superimposed on the sensor output signal has been focused on being removed by the pulse wave signal extraction filter 51 and the pressure signal extraction filter 52 as unnecessary signal components. On the other hand, in the present embodiment, the pump noise component, which has been merely a target for removal, is used for detecting an abnormality in the device. This makes it possible to detect an abnormality in the pressure sensor without, for example, providing two pressure sensors. Further, if the main control unit 30 executes the filter processing for extracting the pump noise component by executing the program, the embodiment can be executed without changing the hardware configuration of the conventional sphygmomanometer.

FIG. 3 is a diagram showing an example of a signal at the time of air supply, in which the horizontal axis is time and the vertical axis is voltage (pressure). (A) is the output signal of the AD converter 22 (referred to as a sensor output signal for convenience because the output signal of the pressure sensor 12 is digitized), and (b) is a pulse wave extracted from the sensor output signal (a). The signal, (c), is a noise signal extracted from the sensor output signal (a). Since the cuff pressure rises with the passage of time, the baseline (DC component) of the sensor output signal (a) rises. By removing the AC component from the sensor output signal (a) with the pressure signal extraction filter 52, the baseline component is obtained as a pressure signal.

The pulse wave signal (b) is obtained by removing the baseline component (DC component) and the frequency component higher than the pulse wave from the sensor output signal (a). The pulse wave signal (b) can be obtained, for example, by applying a bandpass filter to the sensor output signal (a).
The noise signal (c) is obtained by applying a bandpass filter having the peak frequency of the pump noise component at the time of air supply and its peripheral band as a pass band to the sensor output signal (a). The bandpass filter may be realized by a combination of a low-cut filter (or a high-pass filter) and a low-pass filter.

FIG. 4 is a frequency analysis result (frequency spectrum) of the noise signal (c). As described above, the noise signal caused by the pump operating at a constant frequency has an intensity peak at a specific frequency. In the example of FIG. 4, a bandpass filter having a pass band of 80 to 100 Hz may be used as the noise signal extraction filter 51.

For example, the main control unit 30 can make a determination in S121 by frequency-analyzing a noise signal in the latest predetermined section (predetermined number of samples) and comparing the intensity level of the frequency component having a peak with the threshold value.

As described above, according to the present embodiment, there is an abnormality in the components of the cuff pressure control device such as the pressure sensor based on the magnitude of the noise component caused by the pump operation superimposed on the output signal of the pressure sensor. Is detected. Therefore, it is not necessary to provide two pressure sensors or a configuration for switching the flow path in order to detect an abnormality. Moreover, since it can be carried out without adding hardware, an abnormality detection function can be added even in a conventional cuff pressure control device by simply updating the control software. Moreover, since abnormality detection can be performed in parallel with the measurement of biological information, the measurement time is not affected.

(Other embodiments)
In the above-described embodiment, the pump noise extraction filter 50 is used to extract the pump noise component from the pressure signal output by the AD converter 22. However, a signal obtained by subtracting the pulse wave signal and the pressure signal (output by the pressure signal extraction filter 52) from the pressure signal output by the AD converter 22 may be used as the noise signal.

Further, for example, when the frequency band of the biological information (biological signal) to be measured and the frequency band of the signal component caused by the operation of the pump 18 are independent, the pump noise extraction filter 50 may not be used. In this case, the sensor output signal output by the AD converter 22 is directly input to the main control unit 30. Then, in S121, the main control unit 30 has the reciprocal (frequency) of the average value of the distances (time) between adjacent peaks in a predetermined section having an amplitude equal to or higher than the threshold value in the sensor output signal at or near the operating frequency of the pump 18. When it is included in the band, it can be determined that the sensor output signal contains a pump noise component having an intensity level equal to or higher than the threshold value. For example, when the biological information to be measured is a pulse wave, the frequency band is generally in the range of 0.5 to 30 Hz, so that the frequency band of the signal component caused by the operation of the pump is in the range of 80 to 100 Hz. When driving the pump, the pump noise extraction filter 50 may not be used.

As described above, the determination in S121 is performed by any determination method as long as it is possible to determine whether or not the output signal of the pressure sensor 12 contains a signal component caused by the operation of the pump 18 at an intensity level equal to or higher than the threshold value. May be used.

Further, in the above-described embodiment, in order to facilitate explanation and understanding, biological information (here, pulse wave and blood pressure) is measured from a signal representing the internal pressure of the cuff 10 (airbag 11) controlled by the cuff pressure control device. The biometric information measuring device having the configuration to be used has been described. However, the cuff pressure control device of the present invention can also be applied to a biological information measuring device provided with a means for measuring biological information separately from the cuff. For example, the above-mentioned cuff pressure can also be used to control the cuffs of a sphygmomanometer that measures blood pressure based on an auscultation method using a microphone, a sphygmomanometer that measures pulse waves and blood pressure using an optical sensor, and a Doppler blood flow meter. Control devices can be applied.

The control method of the cuff pressure control device according to the present invention can also be realized as a program (application software) for causing one or more programmable processors (computers) of the main control unit 30 to execute the above-mentioned operations. Therefore, such a program and a storage medium (an optical recording medium such as a CD-ROM or DVD-ROM, a magnetic recording medium such as a magnetic disk, a semiconductor memory card, etc.) in which the program is stored also constitute the present invention. ..

10 ... Cuff, 11 ... Airbag, 12 ... Pressure sensor, 14 ... Constant discharge valve, 16 ... Rapid discharge valve, 18 ... Pump, 20 ... Cuff control unit, 22 ... AD converter, 30 ... Main control unit, 50 ... Pump Noise extraction filter, 51 ... Pulse wave extraction filter, 52 ... Pressure extraction filter, 150 ... Sphygmomanometer

Claims (12)

A pump that supplies air to the airbag of the cuff,
A detection means that outputs a signal indicating the internal pressure of the gas flow path connected to the inside of the airbag, and
While supplying air to the airbag, the detection of the intensity level of the signal component included in the output signal from the detection means due to the operation of the pump and the comparison between the intensity level and the predetermined threshold value are repeated. When it is executed and it is not determined that the output signal from the detection means contains a signal component caused by the operation of the pump at an intensity level equal to or higher than the predetermined threshold value , a determination means for determining an abnormality of the device and a determination means.
When the determination means determines an abnormality in the device, the control means for stopping the air supply by the pump and starting the exhaust of the cuff,
A cuff pressure control device characterized by having. Further, it has an extraction means for extracting a signal component caused by the operation of the pump from the output signal of the detection means.
The cuff pressure control according to claim 1, wherein the determination means determines an abnormality of the device when the intensity level of the signal component extracted by the extraction means is not determined to be equal to or higher than the predetermined threshold value. apparatus. The cuff pressure control device according to claim 1 or 2, wherein the threshold value is set based on an intensity level with respect to a frequency determined based on the operating frequency of the pump. The cuff pressure control device according to any one of claims 1 to 3, wherein the pump is a positive displacement reciprocating pump. 1. The pump is a positive displacement reciprocating pump, and the threshold value is set based on an intensity level with respect to a frequency determined based on the operating frequency of the pump and the number of diaphragms of the pump. Alternatively, the cuff pressure control device according to claim 2. With a cuff with an airbag,
The cuff pressure control device according to any one of claims 1 to 5.
A biological information measuring device characterized by having. The biological information measuring device according to claim 6, further comprising a biological signal extracting means for extracting a biological signal by removing a signal component caused by the operation of the pump from the output signal of the detecting means. The biological information measuring device according to claim 7, wherein the biological signal is a pulse wave signal. The biomedical information measurement according to claim 7 or 8, further comprising a determining means for determining a blood pressure value based on the biological signal and a signal obtained by removing an AC component from the output signal of the detecting means. apparatus. The biometric information measuring apparatus according to any one of claims 6 to 9, further comprising a measuring means for measuring the biological information of the person to be measured, which is attached to the person to be measured to which the cuff is attached. .. It is a control method of a cuff pressure control device having a pump for supplying air to an airbag of the cuff.
The acquisition step of acquiring a signal representing the internal pressure of the gas flow path connected to the inside of the airbag, and
During air supply to the airbag, detection of the intensity level of the signal component caused by the operation of the pump included in the signal acquired in the acquisition step and comparison between the intensity level and a predetermined threshold value are compared. When it is repeatedly executed and it is not determined that the signal acquired in the acquisition step contains the signal component caused by the operation of the pump at an intensity level equal to or higher than the predetermined threshold value , the cuff A determination step for determining that the pressure control device is abnormal, and
When it is determined in the determination step that the cuff pressure control device is abnormal, the control step of stopping the air supply by the pump and starting the exhaust of the cuff,
A control method for a cuff pressure control device, which comprises. A program for causing a computer of a cuff pressure control device having a pump for supplying air to an airbag of the cuff to execute each step of the control method of the cuff pressure control device according to claim 11.