JP4745704B2 - Blood pressure measurement device - Google Patents

Description

  The present invention relates to a blood pressure measurement device that calculates a blood pressure value by compressing an outer ear and its peripheral portion and detecting a pulse wave at that portion.

  Generally, in a sphygmomanometer, a cuff wound around an arm or the like is pressurized to a predetermined pressure value by a pressure pump to block the arm and the like, and then the pressurized cuff is decompressed and the pressure in the cuff is detected by a pressure sensor. The pulse wave is detected while calculating the maximum blood pressure value and the minimum blood pressure value based on the detected pulse wave.

  In this general sphygmomanometer, when the pressurization is insufficient, an error is simply displayed to prompt the measurement again, or the pressurization is uniformly performed at a constant amount.

In contrast, the sphygmomanometer disclosed in Patent Document 1 detects insufficient pressurization from the pulse wave amplitude value of the pulse wave signal, and when the pressurization is insufficient, the repressurization amount is determined based on the pulse wave amplitude value. I am trying to calculate. By doing so, the amount of repressurization becomes clear, so that there is an advantage that the measurement time can be shortened.
Japanese Patent Publication No. 7-61321

  However, in Patent Document 1, the cuff is attached to the arm of the person being measured, and the feeling of pressure is very strong. Although the person to be measured thought that the pressurization was over, the pressurization was started again, and the psychological burden was very high, and the person to be measured had to feel very uncomfortable during the measurement.

  In particular, in Patent Document 1, only the pulse wave amplitude value is used as a determination index for insufficient pressurization, and this is compared with a threshold value to detect insufficient pressurization. There is a high risk of losing. If the detection of insufficient pressurization is mistaken, repressurization is performed even though the pressurization is sufficient, and the discomfort / psychological burden of the subject increases. Therefore, it is necessary to detect insufficient pressurization with higher accuracy.

  In addition, when a structure that compresses the outer ear and its surroundings (for example, the tragus) instead of the arm with a cuff (for example, a structure in which the tragus is sandwiched between the cuffs), pressurization control is performed because the ear cuff capacity is small. Is difficult. That is, it is difficult to control the pressurization so as not to crush the pulse wave during pressurization.

  In particular, it may be difficult for a person to be measured with a weak pulse to perform optimal pressurization control while detecting a pulse wave. In this case, there is a high risk of occurrence of insufficient pressurization, and it is particularly necessary to quickly detect insufficient pressurization if insufficient pressurization occurs.

  The present invention has been made in view of the above problems, and provides a blood pressure measurement device capable of detecting and dealing with insufficient pressurization more quickly and accurately without causing discomfort to the measurement subject. It is.

In order to solve the above-described problems, a blood pressure measurement device according to the present invention includes a cuff for compressing the outer ear and appropriate locations around the outer ear, cuff pressurizing means for supplying air to the cuff and pressurizing, and pressure in the cuff. A cuff pressure detecting means for detecting a pulse wave, a pulse wave detecting means for detecting a pulse wave signal from appropriate locations around the outer ear and its periphery, and the cuff is pressurized based on the pulse wave signal detected by the pulse wave detecting means. An under-pressure determining means for determining whether or not it is insufficient, a control means for controlling re-pressurization of the cuff by the cuff press means according to a determination result of the under-pressure determination means, and after the re-pressurization Blood pressure value determining means for determining a blood pressure value based on the cuff pressure and the pulse wave signal, and further calculating a pulse wave parameter for calculating a pulse wave shape parameter from the pulse wave signal detected by the pulse wave detecting means Means comprising The insufficient pressure determination means determines whether or not the cuff is insufficiently pressurized based on the pulse wave shape parameter, and the pulse wave shape parameter is a pulse wave detected before being pressurized by the cuff pressure means. A blood pressure measurement device characterized by being a parameter acquired from a signal .

The underpressurization determining unit determines whether or not underpressurization is performed by comparing the pulse wave shape parameter with a threshold value.

  Furthermore, a threshold value adjusting means for changing the threshold value according to the magnitude of the pulse wave signal detected by the pulse wave detecting means is provided.

Here, the pulse wave shape parameter includes a pulse wave amplitude value.

  The pulse wave detection means uses the light emitting element that irradiates light to the outer ear and its appropriate place and the light receiving element that measures the amount of light that is transmitted or reflected by the outer ear and its surrounding. Is detected.

  The appropriate place in the outer ear and its periphery is the ear canal and / or its peripheral part, or the tragus and / or its peripheral part.

  Other features of the present invention will become apparent from the following description of the best mode for carrying out the invention and the accompanying drawings.

According to the blood pressure measurement equipment of the present invention, without causing discomfort to the subject, and detected more quickly and accurately pressurized shortage, and it is possible to deal with it.

  This embodiment describes a photoelectric pulse wave sphygmomanometer that measures blood pressure by attaching a cuff to the outer ear and its peripheral part (including a portion of the superficial temporal artery or a part of its branch arteriole and part of the ear canal). Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<Auricular structure>
The blood pressure monitor according to this embodiment is attached to the outer ear and its peripheral part as described above, and the outer ear and its peripheral part include the tragus and its peripheral part, and the outer ear includes the ear canal and the pinna. It is a concept that also includes First, the structure of the pinna will be clarified.

  FIG. 1 is a diagram showing names of respective parts of the auricle (ear). In FIG. 1, 121 is a tragus, 122 is an antitragus, 123 is a concha, 124 is an antipod, 125 is an earring, and 126 is an antipodal.

  In the present embodiment, a pair of cuffs 1 to be described later are mounted so as to sandwich the tragus 121 and cover the tragus 121 and its peripheral part. As described above, this peripheral portion includes at least a portion of the superficial temporal artery 128 or a branch vessel thereof and a portion of the ear canal.

<Circuit configuration of photoelectric volume pulse wave sphygmomanometer>
FIG. 2 is a block diagram showing the configuration of the photoelectric volume pulse wave sphygmomanometer of the embodiment. In FIG. 2, reference numeral 30 denotes a detection unit attached to the outer ear and its peripheral part (the tragus and / or its peripheral part). The detection unit 30 includes the cuff 1 (1a and 1b), and measures the blood pressure in the outer ear periphery so as to be able to compress the blood vessels (arterioles) in the outer ear and its periphery (the tragus and / or its periphery). The site is preferably secured to the tragus (and / or superficial temporal artery). Reference numeral 2 denotes a rubber tube (air tube) which forms a flow path of air into the cuff 1. Reference numeral 3 denotes a pressure pump that feeds pressurized air into the cuff 1. 4 is a rapid discharge valve, which rapidly reduces the pressure in the cuff 1. Reference numeral 5 denotes a fine exhaust valve that reduces the pressure in the cuff 1 at a constant speed (for example, 2 to 3 mmHg / sec). Reference numeral 6 denotes a pressure sensor, which changes an electrical parameter according to the pressure in the cuff 1. A pressure detection amplifier (AMP) 7 detects an electrical parameter of the pressure sensor 6, converts it into an electrical signal, amplifies it, and outputs an analog cuff pressure signal P.

  Reference numeral 8 denotes a pulse wave sensor installed in the cuff 1, which includes an LED 8a that irradiates light to a pulsating vascular blood flow, and a phototransistor 8b that detects reflected light from the vascular blood flow (FIG. 4). A pulse wave detection amplifier (AMP) 9 amplifies the output signal of the phototransistor 8b and outputs an analog pulse wave signal M. Here, the LED 8a is connected to a light amount control unit 18 that automatically changes the light amount, and the pulse wave detection amplifier 9 includes a gain control unit 19a that automatically changes the gain and a pulse wave detection filter / amplifier 9. A time constant control unit 19b that changes the time constants of the filter amplifiers 91 and 92 described later is connected. An A / D converter (A / D) 10 converts the analog signals M and P into digital data D.

  Reference numeral 11 denotes a control unit (CPU) which performs main control of the present photoelectric volume pulse wave sphygmomanometer. The CPU 11 has an adjustment pressure register 11a that stores the adjustment pressure.

  Reference numeral 12 denotes a ROM which stores, for example, the control programs shown in FIGS. 6, 7, 8, and 11 executed by the CPU 11. A RAM 13 includes a data memory, an image memory, and the like. A liquid crystal display (LCD) 14 displays the contents of the image memory. Reference numeral 16 denotes a keyboard which can be used to set a measurement start command, an adjustment pressure value, and the like by a user operation. A buzzer 15 informs the user that the device has sensed that the key in the keyboard 16 has been pressed, the measurement has been completed, and the like. In this example, the adjustment pressure register 11 a is provided in the CPU 11, but an adjustment pressure storage unit may be provided in the RAM 13.

  FIG. 5 is an external perspective view of the photoelectric volume pulse wave sphygmomanometer of the embodiment. In FIG. 5, reference numeral 17 denotes a sphygmomanometer body, which includes a configuration excluding the cuff 1 and the pulse wave sensor 8 of FIG. Here, the rubber tube 2 includes a signal line (not shown) with the pulse wave sensor 8 and is connected to the cuff 1 and the pulse wave sensor 8 (not shown). The display panel 14 of the LCD uses a dot matrix type display panel, and therefore can display a variety of information (for example, characters, figures, signal waveforms, etc.). Reference numeral 20 denotes a power switch, and the keyboard 16 has a measurement start switch (ST) and a numeric keypad for inputting a cuff pressure value and the like.

<A state where the detection unit 30 is mounted on the tragus>
FIG. 3 shows a state in which the detection unit 30 is attached to the tragus 121 and its peripheral part (for example, the superficial temporal artery). A holding frame 40 that clamps the tragus 121 with the pressing force of the arms 38 and 39, cuffs 1a and 1b that are arranged inside the arms 38 and 39 to change the pressure applied to the tragus 121, and supply pressurized air to the cuff The light pipe 43 is arranged near the cuff 1, and the light emitting element 8 a that irradiates light to the tragus 121 and the light receiving element 8 b that receives the light reflected by the blood vessels (arterioles).

<Blood pressure measurement operation of photoelectric volume pulse wave sphygmomanometer>
Next, the blood pressure measurement operation of the photoelectric volume pulse wave sphygmomanometer according to the present embodiment will be described below. FIG. 6 is a flowchart of the measurement processing procedure of the photoelectric volume pulse wave sphygmomanometer of this embodiment.

  When the apparatus is turned on by the power switch 20, a self-initial diagnosis process (not shown) is first performed to initialize the apparatus. Thereafter, the process is started by pressing the measurement start switch ST.

  In step S101, the cuff pressure P is read, and in step S102, it is determined whether or not the residual pressure of the cuff 1 is within a specified value. If the residual pressure exceeds the specified value, “residual pressure error” is displayed on the LCD 14 in step S122. If the residual pressure is within the specified value, a cuff pressure value (for example, a value larger than the maximum blood pressure value of 120 to 210 mmHg) is set using the keyboard 16 in step S103, and the light amount and gain are set to predetermined values in step S104. Set to.

  When the setting of the pressurization value and the light quantity / gain is completed, a threshold for detecting insufficient pressurization is set in step S105. This threshold includes a case where a default value prepared in advance is used as it is as a threshold, a case where the default value is changed based on the pulse wave after the pulse wave before pressurization is acquired, and the like. The latter threshold setting process will be described in detail later.

  When the threshold for detecting insufficient pressurization is set, the rapid exhaust valve 4 and the fine exhaust valve 5 are closed in steps S106 and S107. In step S108, driving of the pressure pump 3 is started and pressurization (pressure increase) is started. This is the start of the measurement process during pressurization, and the cuff pressure starts increasing at a constant speed (for example, 2 to 3 mmHg / sec).

  In step S109, it is determined whether or not the cuff pressure P is higher than the pressurization target value U set in S103. If P> U, the pressure is still in the required range, and the pressurization is continued. On the other hand, when P> U, the process proceeds to step S110, and the pressurizing pump 3 is stopped.

In step S111, the fine exhaust valve 5 is opened. Subsequently, in step S112, it is determined whether or not pressurization is insufficient (the operation will be described in detail later with reference to FIG. 7). If the determination result in step S112 is insufficient pressurization, the process proceeds to step S121 via step S113. In step S121, the pressurization target value U for the repressurization process is reset. _That, .DELTA.U the _{U The set} (e.g., a predetermined prescribed value 30 mmHg) is set to _{U reset} by adding (see FIG. 13A). When the pressurization target value is reset, the process proceeds to step S106, and the repressurization process is executed.

  If the determination result in step S112 is sufficient, the process proceeds to step S114 via step S113.

  In step S114, the measurement process at the time of pressure reduction (pressure reduction) is started, and the cuff pressure starts to decrease at a constant speed (for example, 2 to 3 mmHg / sec). During this time, in step S114, data processing by each functional block is performed, and the systolic blood pressure and the diastolic blood pressure are measured.

  In step S115, it is checked whether or not the blood pressure measurement is completed. If the measurement has not been completed yet, the process proceeds to step S116, where it is determined whether or not the cuff pressure is lower than a predetermined value L (for example, 40 mmHg). If P <L, it is still in the normal measurement range, and the flow returns to step S114. On the other hand, when P <L, the cuff pressure is already lower than the normal measurement range, so “measurement error” is displayed on the LCD 14 in step S117. If necessary, display detailed information such as “signal anomaly during decompression”.

  When the measurement is completed in the determination in step S115, the measurement process is completed in the normal measurement range. In step S118, the measured maximum blood pressure value and the minimum blood pressure value are displayed on the LCD 14, and in step S119, the tone signal is displayed to the buzzer 15. Send. Preferably, different tone signals are sent after normal termination and abnormal termination. In step S120, the remaining air in the cuff 1 is quickly exhausted and the next measurement start is awaited.

<Pressure shortage determination operation: Step S112>
FIG. 7 is a flowchart for explaining the operation of the insufficient pressurization determination process in step S112 in the flowchart of FIG.

  In step S201, it is determined whether or not the detected baseline (0 point) of the pulse wave signal is stable. As shown in FIG. 10A, whether or not it is stable is determined based on whether there is no influence on the pulse wave signal due to the pressurization stop and the signal value is substantially flat. If stable, the process proceeds to step S202.

  In step S202, the peak and bottom of the pulse wave are detected. The detection operation is represented by the flowchart of FIG. FIG. 9 shows the relationship between the pulse wave and the differential waveform, and represents the basic concept of detection of the peak and bottom of the pulse wave. The pulse wave peak and bottom detection operations will be described in detail with reference to FIGS.

  In step S301, it is determined whether the differential waveform of the pulse wave signal (FIG. 9A) shown in FIG. 9B has exceeded the threshold value X1. If it does not exceed, X1 may be exceeded or waited within a predetermined time, and if not, X1 and X2 may be changed or the process may be terminated as a timeout and an error displayed.

  In step S302, the time t1 when the upper threshold value X1 is exceeded is stored in the memory (RAM 13). In step S303, it is determined whether the differential waveform has exceeded the lower threshold value X2 (whether it has fallen below). In step S304, the lower time t2 is stored in the memory. Then, in step S305, the peak point of the pulse wave signal in FIG. 9A is set between the times t1 and t2. In step S306, the point at which the pulse wave signal of FIG. 9A is minimum between time t2 and predetermined time Δtα is set as the bottom. As described above, in step S202, the peak and bottom of the pulse wave signal are detected. Here, X1 is a threshold value for determining the peak only when the pulse wave signal exceeds this (X1 value), and X2 is a threshold value for determining the bottom only when the pulse wave signal falls below this (X2 value). It is. Δtα indicates a statistical value for a predetermined time from t2 at which the bottom of the pulse wave signal is likely to come.

  Since the peak and bottom of the pulse wave signal are detected, the process returns to the flowchart of FIG. 7 and the process proceeds to step S203. In step S203, pulse wave parameters α1, α2, and α3 for the first beat after the start of decompression are calculated. That is, as shown in FIG. 10B, α1 is (peak value-baseline), α2 is (baseline-bottom value: absolute value), and α3 is the time difference of the time over which the envelope of the pulse wave signal forming the peak crosses the baseline. Represents.

  In step S204, it is determined whether or not the parameter α1 is smaller than the threshold value Thre1. If larger, the process proceeds to step S205.

  In step S205, it is determined whether or not the parameter α2 is smaller than the threshold value Thre2. If it is smaller, the pressure is sufficient. If larger, the process proceeds to step S206.

  In step S206, it is determined whether or not the parameter α3 is smaller than the threshold value Thre3. If it is larger, it is finally determined that the pressure is insufficient.

  As described above, it is determined whether or not the cuff is sufficiently pressurized by comparing the threshold (three types in the present embodiment) obtained from the pulse wave signal with the threshold value.

<Threshold setting process: Step S105>
FIG. 11 is a flowchart for explaining the operation of the threshold value (Thre1 to 3) setting process shown in step S105 of FIG. That is, when measuring the blood pressure of a measurement subject whose pulse wave before pressurization is originally large, it is necessary to increase the threshold for detecting insufficient pressurization, and thus such a threshold setting process is necessary. is there.

  FIG. 12 is a diagram showing a pulse wave signal before pressurization of a measurement subject, and parameters A1 and A2 in the pulse wave signal are used for threshold calculation in threshold setting processing.

  In step S401, the parameters A1 and A2 in FIG. 12 are calculated. A1 shows the amplitude of the pulse wave signal before cuff pressurization, and A2 is the time width (one cycle) of one pulse wave signal.

  Subsequently, in step S402, A1 / A1a and A2 / A2a are calculated. Here, A1a represents a statistical standard value relating to the amplitude of the pulse wave signal, and A2a represents a statistical standard value relating to one cycle time width of the pulse wave signal. That is, in step S402, an evaluation is made as to how much the pulse wave of the measurement subject deviates from the standard.

  Next, in step S403, the underpressure detection threshold is changed based on the evaluation value obtained in step S402. Here, Thre1a to 3a are default threshold values for detecting insufficient pressurization. Regarding the threshold value change in step S403, for the threshold values Thre1 and 2 relating to the amplitude of the pulse wave signal, the change value is calculated by multiplying the default threshold values Thre1a and 2a by the evaluation value A1 / A1a relating to the amplitude. Further, regarding the threshold value Thre3 related to the period of the pulse wave signal, a change value is calculated by multiplying the default threshold value Thre3a by the evaluation value A2 / A2a related to the period.

  When the change value is calculated, the threshold setting process ends. In the process shown in FIG. 11, the evaluation values A1 / A1a and A2 / A2a are always referred to so as to change continuously according to the values of A1 and A2. You may make it change a threshold value discretely, such as changing a default threshold value only when exceeding. The evaluation values A1 / A1a and A2 / A2a are each expressed by a linear expression of A1 and A2, and are set so as to vary in proportion to the values. However, this is an example, and A1, It is also possible to use a higher-order polynomial using A2.

  In this embodiment, the pulse wave parameters A1 and A2 are acquired from the pulse wave signal before pressurization. However, the present invention is not limited to this, and the pulse wave signal obtained while pressurizing or slightly pressurized. After pressurization is stopped, the pulse wave parameter may be acquired from the pulse wave signal or the like obtained at that time, or the pulse wave parameter acquired at the previous measurement may be used.

<Specific example>
FIG. 13 is a diagram showing (A) a change in cuff pressure when repressurized in blood pressure measurement, and (B) a change in pulse wave signal accompanying a change in cuff pressure.

The cuff is gradually pressurized, and when the pressure value reaches the initially set pressure value U _set , pressure reduction is started and the blood pressure measurement mode is entered. A pulse wave signal E1 at the first beat after the start of pressure reduction (or after a predetermined time has elapsed after pressure reduction) is detected, and it is determined from the shape whether pressure has been insufficient.

  FIG. 14A is an enlarged view of the pulse wave signal E1 of FIG. From this pulse wave signal E1, pulse wave parameters, that is, an amplitude value α1 from the base line to the peak point, an amplitude value (absolute value) α2 from the base line to the bottom point, and a time interval α3 of the base line → peak point → baseline envelope are obtained. Calculated. The pulse wave signals E1 and E2 are the same signal because they correspond to the same cuff pressure.

  And (alpha) 1-3 and threshold value Thre1-3 are compared, and when all the pulse wave parameters are larger than a threshold value, it determines with pressurization insufficient.

When it is determined that the pressurization is insufficient, the pressure is increased again from the current pressure to U _reset (= U _set + predetermined pressure ΔU).

Then, the blood pressure measurement mode is entered again, and the pressure is gradually reduced from U _reset . Also at this time, the pulse wave signal E3 of the first beat is detected, and the above-described pulse wave parameters α1 to α3 are acquired.

FIG. 14B is an enlarged view of the pulse wave signal E3 of the first beat when the pressure is reduced from U _reset . In the pulse wave signal E3, the amplitude value α′1 from the baseline to the peak point and the time interval α′3 from the baseline to the peak point to the baseline envelope are acquired, but the amplitude value (absolute value) from the baseline to the bottom point is acquired. ) Α′2 is “0”.

  Then, the pulse wave parameters α′1 to α3 and the thresholds Thre1 to 3 are compared, and if it is determined that any one of the pulse wave parameters is smaller than the threshold, it is determined that the pressurization is sufficient, and the blood pressure measurement is performed as it is. Continued.

<Other embodiments>
In the above-described embodiment, as shown in FIG. 3, the blood vessel is disposed only on one side of a pair of cuffs having a configuration sandwiching the outer ear and its peripheral part (more specifically, the tragus and / or its peripheral part). An irradiation unit (LED 8a) for irradiating light to the blood flow and a light receiving unit (phototransistor 8b) for detecting reflected light from the blood flow are provided.

  The light irradiation part (refer to FIG. 15: LEDs 8a and 21a) and reflected light are detected on both of the pair of cuffs 1 sandwiching the outer ear and its peripheral part (more specifically, the tragus and / or its peripheral part). And a light receiving section (see FIG. 15: phototransistors 8b and 21b) that can simultaneously measure blood pressures on the outer ear and its peripheral parts, that is, the back side and front side of the tragus. good. By configuring in this way, the cuff on one side compresses the blood vessels (arterioles) on the back side of the outer ear and its peripheral part, and the cuff on the other side superficial temporal artery on the front side of the outer ear and its peripheral part. Compress 128 or its branch vessels.

  By adopting such a configuration, it is possible to measure different types of blood pressure and various indices (e.g., an evaluation index such as a blood pressure index) at one time, and in which blood vessel, that is, the blood vessel of the head including the brain or the heart It can be evaluated whether or not arteriosclerosis is observed in the carotid artery or superficial temporal artery connected from the

  As described above, the blood pressure of the outer ear and its peripheral portion (more specifically, the tragus and the peripheral portion) is measured for the following reason.

  That is, it is known that the tragus and its surrounding blood vessels (arterioles) are close to blood vessels in the brain, and it is thought that changes in blood pressure originating in the brain can be measured. On the other hand, in addition to blood vessels (arterioles) present in the cartilage portion (mainly tragus) of the ear, an artery (superficial temporal artery) directly connected to the heart is also located in the vicinity of the tragus. Therefore, there is an advantage that blood pressure having different information (that is, blood pressure derived from the brain and blood pressure derived from the heart) can be measured simultaneously with a small device in the periphery of the tragus. Moreover, in the blood pressure measurement device of the present embodiment, the blood pressure measurement time can be shortened, and the physical burden on the user due to the cuff pressure can be reduced.

  In the present invention, a storage medium in which a program code of software that realizes the functions of the embodiments is recorded is provided to a system or apparatus, and a computer (or CPU or MPU) of the system or apparatus is stored in the storage medium. It is also achieved by reading and executing the program code. In this case, the program code itself read from the storage medium realizes the functions of the above-described embodiments, and the storage medium storing the program code constitutes the present invention. As a storage medium for supplying such a program code, for example, a floppy (registered trademark) disk, hard disk, optical disk, magneto-optical disk, CD-ROM, CD-R, magnetic tape, nonvolatile memory card, ROM Etc. can be used.

  Further, by executing the program code read by the computer, not only the functions of the above-described embodiments are realized, but also an OS (operating system) running on the computer based on the instruction of the program code Includes a case where the function of the above-described embodiment is realized by performing part or all of the actual processing.

  Furthermore, after the program code read from the storage medium is written to the memory provided in the function expansion board inserted into the computer or the function expansion unit connected to the computer, the function is based on the instruction of the program code. This includes the case where the CPU of the expansion board or function expansion unit performs part or all of the actual processing, and the functions of the above-described embodiments are realized by the processing.

  Further, the program code of the software that realizes the functions of the above embodiments is distributed via a network, so that it can be stored in a storage means such as a hard disk or memory of a system or apparatus or a storage medium such as a CD-RW or CD-R Needless to say, this can also be achieved by the computer (or CPU or MPU) stored in the system or apparatus reading and executing the program code stored in the storage means or the storage medium.

It is a figure which shows the structure of an auricle. It is a block diagram of the photoelectric volume pulse wave sphygmomanometer by this embodiment. 3 is a diagram illustrating details of a configuration of a detection unit 30. FIG. It is a figure explaining the sensor operation | movement in the cuff of a photoelectric volume pulse wave sphygmomanometer. It is an external appearance perspective view of a photoelectric volume pulse wave sphygmomanometer. It is a flowchart for demonstrating the blood pressure measurement operation | movement in the blood pressure meter by this embodiment. It is a flowchart for demonstrating the pressurization shortage determination processing operation. It is a flowchart for demonstrating operation | movement of the pulse wave peak / bottom detection process performed by the pressurization insufficient determination process. It is a figure which shows the outline of the peak / bottom detection operation | movement of a pulse wave. It is a figure which shows the outline of pulse wave parameter calculation operation | movement. It is a flowchart for demonstrating a threshold value setting process. It is a figure which shows the pulse wave before pressurization. It is a figure which shows the change (A) of the cuff pressure at the time of repressurization in the case of blood pressure measurement, and the change (B) of the pulse wave signal accompanying a cuff pressure change. It is a figure which shows the pulse wave signal (A) at the time of insufficient pressurization, and the pulse wave signal (B) at the time of sufficient pressurization. It is a figure which shows the structure of the photoelectric volume pulse wave sphygmomanometer provided with a light emission part and a light-receiving part in both the cuffs which pinch the tragus.

Claims (7)

A cuff to compress the outer ear and its surrounding area,
Cuff pressurizing means for supplying and pressurizing the cuff with air;
Cuff pressure detecting means for detecting the pressure in the cuff;
A pulse wave detection means for detecting a pulse wave signal from the outer ear and appropriate locations around the outer ear;
Based on the pulse wave signal detected by the pulse wave detection means, underpressure determination means for determining whether the cuff is underpressurized;
Control means for controlling re-pressurization of the cuff by the cuff pressurizing means according to a determination result of the under-pressurization determining means;
A blood pressure value determining means for determining a blood pressure value based on the cuff pressure and the pulse wave signal after the repressurization,
Equipped with a,
Furthermore, it comprises a pulse wave parameter calculating means for calculating a pulse wave shape parameter from the pulse wave signal detected by the pulse wave detecting means,
The insufficient pressurization determining means determines whether the cuff is insufficiently pressurized based on the pulse wave shape parameter,
The blood pressure measurement device, wherein the pulse wave shape parameter is a parameter acquired from a pulse wave signal detected before pressurization by the cuff pressurizing unit. The blood pressure measurement apparatus according to claim 1 , wherein the under-pressurization determining unit determines whether or not pressurization is insufficient by comparing the pulse wave shape parameter with a threshold value. The blood pressure measurement device according to claim 2 , further comprising a threshold adjustment unit that changes the threshold according to a magnitude of a pulse wave signal detected by the pulse wave detection unit. The blood pressure measurement device according to any one of claims 1 to 3 , wherein the pulse wave shape parameter includes a pulse wave amplitude value. The pulse wave detection means detects the pulse wave signal by using a light emitting element that irradiates light to the outer ear and its surroundings and a light receiving element that measures the amount of light that passes through or reflects the outer ear and its surroundings. The blood pressure measurement device according to any one of claims 1 to 4 , wherein the blood pressure measurement device is a blood pressure measurement device. The blood pressure measurement device according to any one of claims 1 to 5 , wherein the appropriate place in the outer ear and its periphery is the ear canal and / or its peripheral portion. The blood pressure measuring device according to any one of claims 1 to 5 , wherein the appropriate place of the outer ear and its periphery is a tragus and / or its periphery.

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