JP2000139861A - Continuous hemodynamometer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute precise measurement independent of the individual difference of an examinee by executing stable and reliable measurement even at the time of measuring blood pressure for a long period in a continuous hemodynamometer which measures the blood pressure of a living body by giving vibration to a blood vessel and analyzing the vibration propagated by the blood vessel. SOLUTION: An shaking signal generation means 4 drives an shaker 1 and a signal from a vibration sensor 2 is amplified by an amplifier 6 and then converted to a digital signal by an A/D converter 7. A pulse wave detection means 8 and a shaking wave detection means 9 extract pulse wave components and shaking wave components from a received signal and a judging means 13 judges the fixing state of the shaker 1 and the sensor 2 with the examinee. In the case of detecting an error, abnormality is reported to a measuring person with a lamp 14 or a buzzer 15. In addition, the amplitude of a shaking signal and the gain of an inputting amplifier are made variable and are controlled to obtain a signal amplitude which is the most suitable for detecting blood pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for continuously measuring blood pressure by applying a weak vibration to a blood vessel in a living body and detecting and analyzing the vibration propagated in the blood vessel in the field of medical instruments. About.

[0002]

2. Description of the Related Art Conventionally, in this type of apparatus, a method of continuously measuring blood pressure in a non-invasive manner has been proposed as disclosed in Japanese Patent Application Publication No. 9-506024. This method
Utilizing the fact that the elasticity of a blood vessel changes in response to a change in blood pressure, the elasticity of the blood vessel is calculated by detecting the speed of vibration propagating through the blood vessel, and the blood pressure is estimated from the elasticity value of the blood vessel.

Hereinafter, such a blood pressure measuring method will be described. FIG. 9 shows a block diagram of a conventional continuous blood pressure monitor. The blood vessel is vibrated from the body surface of the subject by the vibrator 1,
The vibration propagated on the blood vessel is detected by the vibration sensor 2.
After the detected vibration is converted into a digital signal by the A / D converter 7, filtering is performed by the phase detecting means 5,
A phase detection process is performed to calculate a phase change caused by a blood pressure change, thereby obtaining a change in the vibration propagation speed. The change in vibration propagation speed indicates a change in elasticity of a blood vessel, and the change in elasticity of a blood vessel indicates a relative value of blood pressure, that is, a dynamic pressure. This change is calibrated by the blood pressure calculating means 10 with the measured values of the systolic blood pressure and the diastolic blood pressure by the calibration cuff sphygmomanometer 11 separately installed on the same subject, so that the blood pressure in the living body can be measured in a non-invasive manner in real time. can do.

[0004]

However, in order to perform highly accurate blood pressure detection in this method, it is necessary to dispose the vibrator and the vibration sensor on the skin immediately above the blood vessel of the subject, and it takes a long time. In the measurement, the probability that the exciter 1 and the vibration sensor 2 cause a position shift due to sweating or body movement of the subject becomes extremely high, and when such a position shift occurs, the propagation of vibration to a blood vessel or There has been a problem that it becomes difficult to detect the vibration of the blood vessel, and the blood pressure measurement becomes impossible. In addition, since the amplitude of the vibration propagating through the blood vessels greatly varies depending on the age, sex, symptoms, etc. of the subject, the excitation amplitude and input signal amplitude required for blood pressure measurement also greatly vary depending on the subject, and the excitation amplitude, There is a problem that there is a subject whose input signal amplitude is too large or too small and it is difficult to accurately determine the blood pressure.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and measures blood pressure while monitoring the mounting state of a vibrator and a vibration sensor. Reliable measurement is possible, and accurate blood pressure can be measured without being affected by individual differences of the subject by controlling the excitation amplitude and reception gain so that the optimal signal amplitude is obtained. It is an object to provide a continuous blood pressure monitor.

[0006]

According to the present invention, in order to achieve the above object, a pulse wave component and an excitation wave component are extracted from a received signal, and the excitation of the excitation means and the vibration detection means are determined from the respective signal amplitudes. Determine the mounting state of the sample, and if an error is detected, notify the operator of the abnormality by light or sound,
Further, the amplitude of the excitation signal and the gain of the input amplifier are made variable, and the amplitude of the excitation signal and the gain of the input amplifier are controlled so as to obtain the optimum signal amplitude for blood pressure detection. As a result, stable and reliable measurement is possible even in long-term blood pressure measurement, and accurate blood pressure can be measured without being affected by individual differences between subjects.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION
Vibration means for vibrating the blood vessel, vibration detection means for detecting vibration transmitted through the blood vessel, and phase detection means for detecting the phase of the vibration transmitted through the blood vessel, wherein the relative velocity of blood pressure is determined based on the propagation speed of the transmitted vibration. In a sphygmomanometer for measuring a value, an amplifying means for amplifying a signal from a vibration detecting means, an analog / digital converting means for converting a detection signal amplified by the amplifying means into a digital signal, and a detection signal converted into a digital signal Pulse wave detecting means for detecting a pulse wave component from a signal from the sensor, an exciting wave detecting means for detecting an exciting signal component generated by the exciting means from the detection signal converted into a digital signal, A determining means for determining a mounting state of the vibration means and the vibration detecting means to the subject from the vibration signal component; and an error notifying means for notifying a blood pressure measurer of a determination result from the determining means. It is a continuous type sphygmomanometer that can determine whether the vibrating means and the vibration detecting means are properly attached to the subject while measuring the blood pressure. Blood pressure measurement becomes possible. In addition, even when the vibration means and the vibration detection means are mounted on the subject, it is possible to determine whether or not the mounting is performed correctly, thereby improving operability.

According to a second aspect of the present invention, the error notifying means includes at least one of a display means for notifying the judgment result from the judgment means by light or a sounding means for notifying the judgment result from the judgment means by sound. 2. The continuous sphygmomanometer according to claim 1, wherein the state of whether the vibrating means and the vibration detecting means attached to the subject are properly attached is immediately and accurately notified to the measurer by light or sound. Can tell.

According to a third aspect of the present invention, the error notifying means has a radio transmitting means and a radio receiving means, and a place where the subject exists and a place where the error notifying means are installed are remote places. 3. The continuous sphygmomanometer according to claim 2, wherein the vibrating means and the vibration detecting means attached to the subject are normal to a measurer remote from the blood pressure measurement point where the subject is located. Can be notified of the state of whether or not it is attached.

According to a fourth aspect of the present invention, the determining means determines whether or not the intensity of the pulse wave is sufficient, and determines whether or not the intensity of the received excitation wave is sufficient. And the step of outputting a normal signal when the pulse wave intensity is sufficient and the intensity of the received excitation wave is sufficient, and when the pulse wave intensity is sufficient and the intensity of the received excitation wave is not sufficient. A step of outputting a vibration means mounting error signal; and a step of outputting a vibration detecting means mounting error signal when the pulse wave intensity is not sufficient. 4. The continuous sphygmomanometer according to any one of claims 1 to 3, wherein a display different from that at the time of the means mounting error is provided. Whether there is a problem Can know the probability, it is possible to quickly deal with the blood pressure undetectable state.

According to a fifth aspect of the present invention, the determining means determines whether or not a sufficient phase difference has been detected by the phase difference detecting means. Outputting a vibration detection means mounting error signal when the intensity of the excitation wave is not sufficient, and detecting the vibration when the intensity of the received excitation wave is not sufficient and the phase difference is not sufficient when the pulse wave intensity is not sufficient. 5. The method according to claim 4, further comprising the steps of: outputting a means attachment error signal; and outputting a normal signal when the intensity of the pulse wave is not sufficient, the intensity of the received excitation wave is sufficient, and the phase difference is sufficient. In the case of a continuous type sphygmomanometer, even if a pulse wave cannot be sufficiently detected, it is possible to determine that the blood pressure is in a normal state if a phase difference necessary for blood pressure detection can be detected, and the apparatus configuration does not require a pulse wave. Unnecessary error Blood pressure meter that does not output the issue can be realized.

According to a sixth aspect of the present invention, when the intensity of the received exciting wave is smaller than a first predetermined exciting wave intensity value, the determining means increases the exciting amplitude in the exciting means. 6. The method according to claim 1, further comprising the step of: when the intensity of the received excitation wave is greater than a second predetermined excitation wave intensity value, decreasing the excitation amplitude in the excitation unit.
In the continuous blood pressure monitor according to any of the above, if the excitation signal is greatly attenuated when propagating through the blood vessels due to the characteristics of the subject, even if the blood vessels are deep, sufficient excitation signal The vibration can be detected by the vibration detecting means, and the blood pressure can be measured. Further, in a subject having a small attenuation of a vibration signal, the vibration amplitude can be suppressed to a minimum necessary vibration amplitude, so that blood pressure measurement can be performed without giving unnecessary large amplitude vibration.

According to a seventh aspect of the present invention, the determining means determines that the amplification in the amplification means is performed when an input signal strength input to the analog-digital conversion means is smaller than a first predetermined input signal strength value. Increasing the degree of amplification and decreasing the degree of amplification in the amplifying means when the input signal strength input to the analog / digital conversion means is greater than a second predetermined input signal strength value. 5. The continuous sphygmomanometer according to any one of 1 to 5, wherein even if the excitation signal is greatly attenuated when propagating through the blood vessel due to the characteristics of the subject, or even if the blood vessel is deep, a sufficient received signal can be obtained. Since the blood pressure is input to the analog / digital conversion means, the blood pressure can be measured. Further, when the blood vessel is in a shallow region and the pulse wave signal is excessively detected, the amplification degree of the amplifying means is reduced, so that saturation in the analog / digital conversion means can be avoided, and blood pressure measurement can be performed. .

Next, an embodiment of the present invention will be described with reference to the drawings. (Embodiment 1) FIG. 1 is a block diagram showing a configuration of a sphygmomanometer according to Embodiment 1 of the present invention. A vibrator 1 as a vibration means for vibrating a blood vessel is mounted on the radial artery of the wrist, and a vibration sensor 2 for detecting vibration transmitted through the blood vessel is mounted on the heart side of the same radial artery. . Further, a cuff type sphygmomanometer 3 for calibrating a blood pressure measurement value is mounted on the upper arm. The excitation signal generation means 4 generates a sine wave of about several hundred hertz instructed by the phase detection means 5 and drives the vibration exciter 1. The amplifier 6 amplifies the signal from the vibration sensor 2 into a signal suitable for the input range of the A / D converter 7. The A / D converter 7 converts a received signal into a digital signal. The received signal converted into the digital signal is sent to the phase difference detecting means 5, the pulse wave detecting means 8, and the excitation wave detecting means 9, respectively. The phase difference detection means 5 detects only the excitation frequency component from the received signal by phase detection and calculates the amount of phase change.

FIG. 2 shows a plot of real and imaginary components of data obtained by phase detection on two-dimensional coordinates. The data is distributed on the circumference around a certain offset point O, and the amount of change in the phase angle from the point O is an amount proportional to the relative value of the blood pressure.

The blood pressure calculating means 10 operates the cuff type sphygmomanometer 11 to obtain the minimum value and the maximum value of the blood pressure. Then, by calibrating the relative value of the blood pressure from the phase difference detection means 5 with the minimum value and the maximum value, a continuous blood pressure waveform is generated, and the monitor 1
Displayed at 2. The pulse wave detecting means 8 extracts a pulse wave signal of tens of hertz or less contained in the received signal and detects a maximum amplitude in a period of about 2 seconds. About 2 seconds is a time based on a period of one or more heartbeats of the subject, and by detecting the maximum amplitude during this period, the maximum value of the pulse wave amplitude can be detected.

The excitation wave detecting means 9 extracts only the excitation signal frequency component contained in the received signal and detects the maximum amplitude in a period of about 2 seconds. About 2 seconds is equivalent to the detection cycle of the pulse wave detection means 8 described above. The extraction of the excitation signal frequency component by the excitation wave detection means 9 is performed as follows.
It is also possible to use the phase detection output included in the phase difference detecting means 5. As a result, the operation time by hardware or software can be reduced.

The judging means 13 determines whether the vibrator 1 and the vibration sensor 2 are correctly mounted on the blood vessel based on the pulse wave amplitude value from the pulse wave detecting means 8 and the exciting wave amplitude value from the exciting wave detecting means 9. It is determined whether or not there is a problem with the mounting, and if it is determined that there is a problem with the mounting, an error signal is output to notify the measurer via the status display lamp 14 and / or the buzzer 15 that the error state has been detected.

The details of the error determination algorithm in the determination means 13 will be described with reference to the flowchart of FIG.
First, in step S1, the signal strength of the pulse wave is determined. This can be realized, for example, by comparing the pulse wave amplitude value from the pulse wave detection means 8 with a predetermined pulse wave intensity value. If it is determined in step S1 that the signal intensity of the pulse wave is not sufficient, an error signal is output at step S2 to indicate that the vibration sensor 2 is not properly mounted on the blood vessel. If it is determined in step S1 that the signal intensity of the pulse wave is sufficient,
In step S3, the signal strength of the excitation wave is determined.
This can be realized, for example, by comparing the excitation wave amplitude value from the excitation wave detection means 9 with a predetermined excitation wave intensity value. If it is determined in step S3 that the signal intensity of the excitation wave is not sufficient, an error signal is output in step S4 to indicate that the excitation device 1 is not properly mounted on the blood vessel. In step S3,
If it is determined that the signal intensity of the excitation wave is sufficient, no error signal is output, indicating that the vibration sensor 2 and the exciter 1 are correctly mounted.

In FIG. 1, the status display lamp 14 has a vibrator status display lamp 41 and a vibration sensor status display lamp 42 mounted on a panel 43 as shown in FIG. When the judging means 13 outputs the vibration means mounting error signal, the vibrator state display lamp 41
Emits red light, and emits green light when no vibration means attachment error signal is output. When the judging means 13 outputs the vibration detecting means attaching error signal, the vibration sensor status display lamp 41 emits red light, and when the vibration detecting means attaching error signal is not outputted, it emits green light. The buzzer 15 sounds when the determination unit 13 outputs the vibration unit attachment error signal or the vibration detection unit attachment error signal, and calls the blood pressure measurer's attention.

As described above, according to the configuration of the sphygmomanometer and the mounting state determination algorithm of the sensor according to Embodiment 1 of the present invention, the mounting state of the vibrator 1 and the vibration sensor 2 on the subject is constantly monitored. -It is possible to measure blood pressure while making a determination, and if the exciter 1 and the vibration sensor 2 are displaced due to sweating of the subject during a long-term measurement, the measurer can immediately recognize it. Thus, it is possible to immediately take appropriate measures. Therefore, stable blood pressure measurement can be performed for a long time.

(Embodiment 2) FIG. 5 shows a configuration of a sphygmomanometer according to Embodiment 2 of the present invention. A feature of the second embodiment of the present invention resides in that a wireless transmitting unit 16 and a wireless receiving unit 17 are further provided in the configuration of the first embodiment.
In addition, the same reference numerals are given to components that perform the same operations as in the first embodiment, and description thereof will be omitted.

The radio transmitting means 16 receives the error signal from the judging means 13 as input, modulates the error signal information as radio wave information and transmits it to the radio receiving means 17, and at the same time, the blood pressure waveform signal from the blood pressure calculating means 10 The signal is modulated as an input and transmitted to the wireless receiving means 17. The wireless receiving unit 17 receives the radio wave information from the wireless transmitting unit 16 and demodulates it as error signal information. The demodulated error signal informs the measurer via the status display lamp 14 and / or the buzzer 15 that the error state has been detected. Further, the wireless receiving means 17 also demodulates the blood pressure waveform signal from the blood pressure calculating means 10 and displays the blood pressure waveform on the monitor 12 connected thereto.

As described above, according to the configuration of the sphygmomanometer according to the second embodiment of the present invention, a radiological transmitting means 16 and a radio receiving means 17 allow a measurer, such as a nurse, to move from a hospital room where a subject is located. The blood pressure waveform and the state of blood pressure measurement can be monitored even from a nurse station at a remote place, and centralized management of blood pressure measurement is possible.

(Embodiment 3) FIG. 6 shows a flowchart of an error determination algorithm in the determination means of the sphygmomanometer according to Embodiment 3 of the present invention. First, in step S5, the signal strength of the pulse wave is determined. This can be realized, for example, by comparing the pulse wave amplitude value from the pulse wave detection means 8 with a predetermined pulse wave intensity value. Step S
If it is determined in step 5 that the signal strength of the pulse wave is not sufficient, the signal strength of the excitation wave is determined in step S6. This can be realized, for example, by comparing the excitation wave amplitude value from the excitation wave detection means 9 with a predetermined excitation wave intensity value. If it is determined in step S6 that the signal intensity of the excitation wave is not sufficient, an error signal is output in step S7 to indicate that the vibration sensor 2 is not correctly mounted on the blood vessel.

If it is determined in step S6 that the signal intensity of the excitation wave is sufficient, it is determined whether the phase difference of the excitation signal received in step S8 is sufficiently detected. This can be realized, for example, by comparing whether or not the phase signal from the phase detecting means 5 has a phase difference equal to or greater than a predetermined phase difference within a predetermined value for a predetermined period. If it is determined in step S8 that a sufficient phase difference has not been detected, the process proceeds to step S8.
7, an error signal is output to indicate that the vibration sensor 2 is not correctly mounted on the blood vessel.
If it is determined in step S8 that a sufficient phase difference has been detected, the pulse wave is not detected with a sufficient amplitude, but a sufficient phase difference of the excitation wave signal required for blood pressure measurement is obtained. And terminates without outputting an error signal.

If it is determined in step S5 that the signal intensity of the pulse wave is sufficient, the signal intensity of the excitation wave is determined in step S9. This corresponds to step S6
Similarly to the above, for example, it can be realized by comparing the excitation wave amplitude value from the excitation wave detection means 9 with a predetermined excitation wave intensity value. If it is determined in step S9 that the signal intensity of the excitation wave is not sufficient, an error signal is output in step S10 to indicate that the excitation device 1 is not correctly mounted on the blood vessel. If it is determined in step S9 that the signal intensity of the excitation wave is sufficient, the process ends without outputting an error signal.

As described above, according to the configuration of the sphygmomanometer according to the third embodiment of the present invention, even when a pulse wave cannot be sufficiently detected, if a phase difference necessary for blood pressure detection can be detected, a normal state is obtained. Therefore, in the case of a device configuration that does not require a pulse wave, a blood pressure monitor that does not output an unnecessary error signal can be realized.

(Embodiment 4) FIG. 7 shows a flowchart of an excitation signal amplitude control algorithm in the determination means of the sphygmomanometer according to Embodiment 4 of the present invention. In the fourth embodiment, the excitation signal generation means 4 of FIG. 1 has a variable gain amplifier, and is configured to be able to change the signal amplitude given to the excitation device 1. Further, the amplification degree is controlled by a control signal from the determination means 13.

In FIG. 7, a step S11 decides whether or not the intensity of the exciting wave signal received from the exciting wave detecting means 9 is greater than a predetermined first exciting wave intensity value THm1. If it is determined in step S11 that the received excitation wave signal intensity is not larger than the first predetermined excitation wave intensity value THm1, the current excitation device output amplitude is set in step S12 to the predetermined excitation device output. It is determined whether the value is smaller than the limit value THlmt. If it is determined in step S12 that the current shaker output is smaller than the shaker output limit value THlmt, the amplitude of the shake signal is increased in step S13, and the command is transmitted to the shake signal generating means 4. You. If it is determined in step S12 that the current exciter output is not smaller than the exciter output limit value THlmt, the process ends.

If it is determined in step S11 that the received excitation wave signal intensity is greater than the first predetermined excitation wave intensity value THm1, then in step S14, the excitation wave detection means 9
Then, it is determined whether or not the received excitation wave signal intensity is higher than a second predetermined excitation wave intensity value THm2. If it is determined in step 14 that the received excitation wave signal intensity is not larger than the second predetermined excitation wave intensity value THm2,
Exit as it is. If it is determined in step 14 that the received excitation wave signal intensity is greater than the second predetermined excitation wave intensity value THm2, the excitation signal amplitude is reduced in step S15, and the instruction is sent to the excitation signal generation means 4. Is transmitted.

As described above, according to the configuration of the sphygmomanometer according to the fourth embodiment of the present invention, the case where the excitation signal is greatly attenuated when propagating through the blood vessel due to the characteristics of the subject, In a deep portion, by increasing the amplitude of the excitation signal applied to the exciter, an excitation signal sufficient for blood pressure detection can be detected by the vibration sensor 2, and blood pressure measurement can be performed. Further, in a subject in which the attenuation of the excitation signal is small, the amplitude of the excitation signal is reduced to a minimum required excitation amplitude, so that the blood pressure measurement can be performed without giving unnecessary large amplitude vibration, It is possible to reduce power consumption and alleviate discomfort to the subject.

(Embodiment 5) FIG. 8 shows a flowchart of an amplification degree control algorithm of the amplifier 6 in the determination means of the sphygmomanometer according to Embodiment 5 of the present invention. In the fifth embodiment, the amplifier 6 of FIG. 1 is realized by a variable gain amplifier, and the amplification degree is controlled by a control signal from the determination unit 13.

In FIG. 8, step S16 is an A / D
It is determined whether the maximum value of the absolute value of the output signal from the converter 7 is larger than the first predetermined input signal strength value THa1. If it is determined in step S16 that the maximum value of the absolute value of the output signal from the A / D converter 7 is not larger than the first predetermined input signal strength value THa1, the signal is input to the A / D converter 7. The amplitude of the present signal is considered to be too small, and an output is performed in step S17 so as to increase the degree of amplification in the amplifier 6. When it is determined in step S16 that the maximum value of the absolute value of the output signal from the A / D converter 7 is larger than the first predetermined input signal strength value THa1, the A / D converter 7 determines in step S18. It is determined whether or not the maximum value of the absolute value of the output signal is larger than the second predetermined input signal strength value THa2.

If it is determined in step S18 that the maximum value of the absolute value of the output signal from the A / D converter 7 is not larger than the second predetermined input signal strength value THa2, the A / D converter
The signal amplitude input to the converter 7 is considered to be within the specified range, and the process ends. If it is determined in step S18 that the maximum value of the absolute value of the output signal from the A / D converter 7 is larger than the second predetermined input signal strength value THa2, the signal is input to the A / D converter 7. The signal amplitude is considered to be excessive, and the amplifier 6
Is output so as to reduce the degree of amplification at.

As described above, according to the configuration of the sphygmomanometer according to the fifth embodiment of the present invention, when the excitation signal is greatly attenuated when propagating through the blood vessel due to the characteristics of the subject,
When it is determined that the blood vessel is in a deep part and the amplitude of the received signal input to the A / D converter 7 is too small, the amplification degree of the amplifier 6 in the preceding stage of the A / D converter 7 is increased and Since a signal having a large amplitude is input to the A / D converter 7, highly accurate blood pressure measurement can be performed. When the blood vessel is in a shallow region and the pulse wave signal is excessively detected and saturation may occur in the A / D converter 7, the amplification of the amplifier 6 is reduced and the A / D converter 7, it is possible to configure a device capable of measuring blood pressure even for a subject having various characteristics.

[0037]

As is apparent from the above description, according to the present invention, the excitation signal component and the pulse wave component are extracted from the received signal, and the conditions are determined by using the respective amplitude intensities. It is possible to detect whether the means and the vibration detecting means are correctly attached to the subject. Therefore, when the vibration means and the vibration detection means are mounted, whether or not the mounting positions are correct is immediately notified to the measurer, and a sphygmomanometer with easy blood pressure measurement can be provided. In addition, in the long-term blood pressure measurement, if the vibration means or the vibration detection means becomes improperly attached due to sweating or body movement of the subject, the measurer is immediately notified as an error signal, so reliability is improved. High blood pressure measurement is possible. Further, by controlling the amplitude of the excitation signal and the amplitude of the received signal in accordance with the state of the received signal, blood pressure detection can be accurately performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a use mode and a use mode of a sphygmomanometer according to a first embodiment of the present invention.

FIG. 2 is a plot diagram of data obtained by a phase detection unit of the sphygmomanometer according to the first embodiment.

FIG. 3 is a flowchart of error determination by a determination unit of the sphygmomanometer according to the first embodiment;

FIG. 4 is a front view of the vibration sensor of the sphygmomanometer according to the first embodiment.

FIG. 5 is a use mode and a block diagram of a sphygmomanometer according to a second embodiment of the present invention.

FIG. 6 is a flowchart of an error determination in the determination unit of the sphygmomanometer according to the third embodiment of the present invention.

FIG. 7 is a flowchart of excitation signal amplitude control in the determination unit of the sphygmomanometer according to Embodiment 4 of the present invention.

FIG. 8 is a flowchart of amplifier control in determination means of a sphygmomanometer according to Embodiment 5 of the present invention.

FIG. 9 is a block diagram showing a usage mode and a conventional blood pressure monitor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Exciter (excitation means) 2 Vibration sensor (vibration detection means) 3 Cuff type sphygmomanometer 4 Excitation signal generation means 5 Phase detection means 6 Amplifier 7 A / D converter 8 Pulse wave detection means 9 Excitation wave detection Means 10 Blood pressure calculating means 11 Cuff type sphygmomanometer 12 Monitor 13 Judgment means 14 Status display lamp (Error notifying means) 15 Buzzer (Error notifying means) 16 Wireless transmitting means 17 Wireless receiving means

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kinya Hasegawa 3-1-4 Tsunashima Higashi, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture Inside Matsushita Communication Industrial Co., Ltd. Chome 3-1, Matsushita Communication Industrial Co., Ltd. F-term (reference) 4C017 AA08 AA09 AB01 AB02 AC03 AC20

Claims (7)

[Claims] A vibration detecting means for oscillating a blood vessel; a vibration detecting means for detecting a vibration transmitted through the blood vessel; and a phase detecting means for detecting a phase of the vibration transmitted through the blood vessel. In a sphygmomanometer for measuring a relative value of blood pressure from a speed, an amplifying means for amplifying a signal from a vibration detecting means, an analog / digital converting means for converting a detection signal amplified by the amplifying means into a digital signal, and a digital signal. Pulse wave detection means for detecting a pulse wave component from a signal from the converted detection signal; excitation wave detection means for detecting an excitation signal component generated by the excitation means from the detection signal converted to a digital signal; Judging means for judging the attachment state of the vibration means and the vibration detecting means to the subject from the pulse wave component and the vibration signal component, and an error informing the blood pressure measurer of the judgment result from the judgment means. A continuous sphygmomanometer having a notification means. 2. The continuous system according to claim 1, wherein said error notifying means has at least one of a display means for notifying a judgment result from said judging means by light and a sound generating means for notifying a judgment result from said judging means by sound. Sphygmomanometer. 3. The error notifying means has a wireless transmitting means and a wireless receiving means, and enables a place where the subject exists and a place where the error notifying means is installed to be a remote place. 2. The continuous sphygmomanometer according to 2. 4. The step of determining whether the intensity of the pulse wave is sufficient, the step of determining whether the intensity of the received excitation wave is sufficient or not, Outputting a normal signal when the intensity of the received excitation wave is sufficient, and outputting an error signal for mounting the excitation means when the intensity of the pulse wave is sufficient and the intensity of the received excitation wave is not sufficient. And a step of outputting a vibration detection means attachment error signal when the pulse wave intensity is not sufficient, further comprising a step of displaying differently when the error notifying means is different from the vibration means attaching error and the vibration detecting means attaching error. The continuous blood pressure monitor according to claim 1, wherein: 5. A step for determining whether or not a sufficient phase difference is detected by the phase difference detecting means, wherein the pulse wave intensity is not sufficient and the intensity of the received excitation wave is not sufficient. Outputting a vibration detection means mounting error signal when the pulse wave intensity is not sufficient and the intensity of the received excitation wave is sufficient and the phase difference is not sufficient when the phase difference is not sufficient. 5. The continuous sphygmomanometer according to claim 4, further comprising a step of outputting a normal signal when the intensity of the pulse wave is not sufficient, the intensity of the received excitation wave is sufficient, and the phase difference is sufficient. 6. The method according to claim 6, wherein the determining unit increases the excitation amplitude in the excitation unit when the intensity of the received excitation wave is smaller than a first predetermined excitation wave intensity value; The step of reducing the vibration amplitude in the vibration means when the intensity of the vibration is greater than a second predetermined vibration wave intensity value. 7. The method according to claim 7, wherein the determining unit increases an amplification degree in the amplification unit when an input signal intensity input to the analog-digital conversion unit is smaller than a first predetermined input signal intensity value. Reducing the degree of amplification in said amplifying means when the input signal strength input to the analog / digital conversion means is greater than a second predetermined input signal strength value.
The continuous blood pressure monitor according to any one of the above.