JPS58127635A - Automatic hemomanometer apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic blood pressure measuring device 1 for automatically measuring the surface pressure of a human body, and in particular, it allows pressure changes in a cuff when there is likely to be noise that interferes with blood pressure measurement. The present invention relates to an automatic blood pressure measuring device that prevents pressure changes during existing periods.

The automatic blood measurement equipment for the intermittent type (town blood observation type) is equipped with a cuff that compresses a part of the human body, and detects blood vessel sounds that occur spontaneously due to changes in the pressure of the cuff, or pressure vibrations of the cuff. Blood pressure is measured by automatically detecting changes in the pulse wave that appear in the blood pressure. In this type of automatic blood pressure measurement equipment, the subject may move or
If noise is mixed into the blood vessel sound signal output from the blood vessel sensor when the measuring person touches the cuff, or the pressure signal output from the pressure sensor that detects the pressure in the cuff, a □ will occur in the primary measurement. It determines the blood vessel sound signal necessary for measurement and noise based on the signal level and frequency, and when the noise with indistinguishable frequency components stops, it blocks the signal input for blood pressure measurement. This helps prevent erroneous measurements.

However, such conventional automatic surface measurement devices 1. According to the authors, if noise is continuously mixed in for a certain period of time, the pressure of the manchette will cause customers to die regardless of whether noise occurs or not, so the timing of the noise and the process by which the main power of the manchette becomes multiplied are important. There was a drawback that the systolic blood pressure measurement period and the diastolic blood pressure measurement period overlapped, making automatic blood pressure measurement impossible. An automatic blood pressure measuring device is being considered that checks for the presence of A and collects blood vessel sound signals or pulse wave signals, which are pressure vibrations of the cuff, only when there is no noise, and then changes the pressure to the next step = 5-steps. With such a device, blood pressure measurement takes a long time, making it easy for the person being measured to become congested. Also, since the blood pressure measurement differs from conventional continuous pressure changes, it is necessary to have medical support for the blood pressure measurement value. The sushi was not good enough, and there was a problem of lack of practicality.

The non-invention was made with the above small amount as the back,
The purpose of this is to create an automatic blood pressure measuring device that allows pressure changes in the cuff when there is no noise that would interfere with automatic blood pressure measurement, and detects pressure changes in the cuff when noise is present. It is about providing.

In order to achieve this purpose, the small invention provides a method for increasing or decreasing the pressure of a part of the human body during blood pressure measurement.
In an automatic blood pressure measurement system that is equipped with a cuff that changes the pressure state and measures blood pressure based on pulse waves appearing as pressure vibrations of the cuff, (I) detects the main force inside the cuff and measures the pressure; 6- (2) a noise detection device i that detects noise included in the monthly force signal and outputs an abnormal signal indicating the presence of the noise;
(3) While the abnormal signal is being output, the supply 7 of the fluid supplied to the thread 11 to the manchette and the discharge of the fluid previously supplied to the manchette are stopped. A monthly power cut-off means for temporarily stopping the increase or decrease of the pressure of the manchette is provided, and the pressure change of the manchette is allowed when the noise is not present, and the pressure change is blocked when the noise is present. shall be.

In this way, when blood pressure is automatically measured by detecting changes in the size of pulse waves, which are pressure vibrations in the cuff, if the person being measured moves, the measurement person or the cuff may be affected. Since the cuff cracking is prevented during the period when noise is mixed in the pressure signal due to causes such as touching, the maximum surface pressure value or The timing of measuring the diastolic blood pressure value is avoided, and automatic blood pressure measurement becomes possible even if there is noisy crowd or continuous noise for a certain period of time. Moreover, compared to the conventional automatic blood pressure measurement that changes the pressure of the manchet in stages, the period of noise contamination only increases the period of time when the manchette is compressed.
In addition, since one side of the manchette is gradually changed, the pain of the patient to be measured is almost increased, and a highly reliable blood pressure measurement can be obtained.

In another aspect, the cuff is provided with a cuff that changes the compression state of a part of the human body by increasing or decreasing the pressure when measuring blood pressure, and the cuff is used to measure the blood pressure based on the Korotkoff sounds included in the blood vessel sounds generated by the compressed human body. In the automatic blood pressure measuring device 1-1 for measuring blood pressure, (1) detecting the blood vessel front of the compressed body;
(2) a noise detection device that detects noise included in the blood vessel signal and outputs an abnormal signal without indicating the presence of the noise; (3) While the abnormal signal is being output, the pressure of the manchette is increased by stopping the supply of fluid to the manchette or the discharge of fluid σ that has been previously blocked in the manchette. Alternatively, a pressure stopper for temporarily stopping the lowering is provided, and the pressure change is allowed to occur when the manchette is not present, and the pressure change is prevented when the manchet is present.

With this shift, when automatically measuring blood pressure by detecting the generation and disappearance of Korotkoff sounds that mimic the blood pressure in the blood vessels, it would be difficult to detect the movement of the foot measurer or other devices such as an electric scalpel. Due to the operating intelligence of the machine, pressure changes in the manchette are prevented during the period when noise is mixed in the blood vessel sound, so the same effect as the above-mentioned light is produced.

Embodiment J of the invention will be described in detail below with reference to the drawings.

In Fig. 1, a cuff 10 in the form of a rubber bag that can be wrapped around a part of the human body is connected to a cuff, a capacitor 12, an air pump 14, and solenoid valves 1G and 18 through conduits 9-20. It continues.

The pressure sensor 12 detects sweat and force inside the manchet 1o, and supplies the pressure SP to the pulse wave sensor 22 and A/D converter 24 without expressing the pressure. The pulse wave of the 4j subject is included in the signal SP as a vibration (alternating current) component. The pulse wave sensor 22 includes a filter that passes a signal in the frequency band of the pulse wave and an A/D converter that converts the magnitude of the passed signal into a code signal. A pulse wave signal SM representing the magnitude of is supplied to the 110 boat 26. The A/D converter 24 converts the focus signal Sp representing the pressure in the manchette 1o into a code signal, and supplies the code signal to the I10 boat 26 as the manchette pressure signal SK.

The air pump 14 is equipped with a drive motor and supplies air into the manchette 1o in accordance with a pump drive signal SA supplied from the I/O boat 26. The electromagnetic valve 16 is an on-off valve equipped with a hoard connected to the pipe line 20 and atmospheric boats 28 and 10- which are open to the public, and is an on-off valve that is equipped with a hoard connected to the pipe line 20 and air boats 28 and 10- which are opened. It communicates with the atmosphere. The solenoid valve 18 is an on-off valve inserted between the path 2o and the misplacement valve 30, and is
In response to the exhaust stop signal Sl, which is an abnormal signal supplied from the port 26, the connection between the pipe line 20 and the exhaust valve 30 is shut off kL.
, and constitutes pressure stopping means for blocking the specific force inside the manchette 10 when noise occurs.

110 port 26 connects the CPU (
It is connected to the arithmetic processing unit) 32, RAM 34, and ROM 35, and in response to instructions from the CPU 32, a signal is supplied to the data bus line or a signal that is not supplied from the data bus line. Pump I
4. Output to solenoid valves 16 and 18. The CPU 32 reads the RAM according to the program stored in the ROM 36 in advance.
Execute signal processing while utilizing the temporary memory function of 34,
10 The pump drive signal SA, sudden exhaust signal SN, and exhaust stop signal SL are fully outputted through the boat 26. Therefore, the CPU 32, RAM 34, and ROM 36 also serve as a noise detection device K+ that detects noise and outputs an abnormal signal.

A start switch 38 is provided to stop the start signal SS in accordance with a suppression operation for starting blood pressure measurement, and the start signal SS is supplied to the 110 hoard 26.

Further, a blood pressure display 40 is provided which numerically displays the automatically measured blood pressure value in accordance with the display signal SB output from the 1/O port 26.

The operation of this embodiment will be explained below.

Power is supplied to each part of the apparatus from a power switch (not shown), and the CPU 32 operates according to the flowchart of FIG. 2 showing a program stored in advance in the ROM.

First, step S1 is executed, and the start switch 38 is
The operating status of the device can be determined. As long as the start switch 38 is not pressed and the start signal 88 is not generated, the execution of step S1 is repeated, but if the start bar SS is not supplied to the ■10 boat 26 due to the press operation, the next steps S2 and S3 are executed. executed. Step S
In step S2, the pump drive function 8A is supplied to the air pump 14, and air is supplied from the air pump 14 into the manchette 10, and the pressure in the manchette 10 begins to rise, and in step S3, the air pump 14 is activated. It is determined whether the time Tp exceeds a predetermined constant operating time T1 or if the cup is still running.

Here, the fixed operating time T1 is set so that the pressure in the manchette 10 reaches the treasure trove when it is normal, in order to judge the failure of the booster system 1 such as damage to the pipe 20 or the manchette 10 or failure of the air pump 14. The time is determined by the person, and the culm degree is usually set at 30 culms in advance. The operating time T of the air pump 14 is a predetermined constant operating time T1.
If the pressure exceeds SK, step 814 described below is executed to rapidly exhaust the manchette 10, or if it does not exceed step S4, the pressure of the manchette 10 is reduced regardless of whether the pressure is SK or not. 13- is determined whether or not the pressure has reached a predetermined constant pressure P1. Here, the constant pressure P1 is set to a value that is sufficiently larger than the systolic blood pressure value of the subject.

If the pressure P of the manchette 10 does not exceed the set pressure P1, step S3 is executed, but if it does, steps S5 to S7 are not executed. Step S
5, as shown at time A in FIG. 3, the supply of the pump drive signal SA to the air pump 14 is stopped to stop the pressure increase in the manchette 10, and in step S6, the exhaust is stopped. 10 The output of the signal SL from the boat 26 is blocked, the solenoid valve 18 is opened, the air in the manchette 10 is exhausted through the throttle valve 30, and concentrated descent 1 of the manchette 10 is started.

Then, in step S7, it is determined whether the blood pressure measurement has been completed, that is, whether the measurement of the diastolic blood pressure value has been completed.

That is, as shown in FIG. 4 by enlarging the alternating current component included in the pressure signal 5SP, the magnitude of the pulse wave has the property of increasing and decreasing as the pressure of the sleeve 10 decreases, and , 36, the manchette pressure signal SK at time B when the pulse wave signal SM appears and the magnitude of the pulse wave rapidly increases. Blood pressure is measured by taking the pressure value of the manchet 10 as the systolic blood pressure and the pressure value of the manchet 10 at time C when the pulse wave suddenly increases in magnitude as the diastolic blood pressure. Then, depending on the presence or absence of a signal indicating that the measurement of the diastolic blood pressure value is completed, step
At the same time, the judgment in step 7 is made, and a signal SB indicating that the measured blood pressure values are not displayed is outputted to the blood pressure display 40, and the immediate low values of the systolic and diastolic blood pressure values are displayed. It should be noted that the waveforms in FIG. 4 are for the purpose of simplification of understanding and do not represent actual pulse waves.

When the measurement of the diastolic blood pressure value is completed, step 814 is executed and the rapid exhaust signal 5H or the solenoid valve heat 6 is supplied.
Air line 20 in manchette 10 and solenoid valve 16
All valves 16 are vented to the atmosphere and the pressure within the manchette 10 begins to evacuate rapidly. The 0 point in Figure 3 does not indicate this condition. However, if the measurement of the diastolic blood pressure value has not yet been completed, the steps from step 88 onwards are executed.

First, in step S8, based on the pulse wave signal 8M and the manchet force signal SK, the pressure value P of 10 at that time is read (stored) every time the pulse wave stops. It is determined whether the currently stored pressure value P is greater than the previously stored minimum pressure value Pmin plus a constant value a. In other words, when the object to be measured moves or the measuring person or a doctor performing surgery touches the cuff 1o, the variation value (P-Pmin) in the pressure increasing direction of the cuff 10, which is the opposite direction to the steady decreasing direction of the cuff 10. If it exceeds the value α, it is determined to be noise. In addition, the value α is set slightly larger than the maximum value of the amplitude of the pulse wave so that the alternating current component due to the normal pulse wave is not judged as noise, and the value α is set to be approximately 3 to 10 mmHg. or suitable. Furthermore, after the evacuation starts in step S6, if the IF chi 10P of the manchette 1o is read for the first time in step s8, that is, if the previous minimum pressure value Pmin is zero, the judgment in step S9 is not allowed to occur.

The pressure increase force direction of the manchette 10 exceeds the value α.
If not, steps S7 to S89 are executed again, or if the hyperactivity exceeds the value α and is determined to be noise, step 89 is executed and the exhaust stop number SL is output. Well, close the city 1 solenoid valve 18 to stop the pressure drop in the manchette 10. Time point D in FIG. 3 does not show this state. Then, in step S11, the manchet 1
It is determined whether the exhaust stop time t8 of 0 exceeds a predetermined maximum stop time T2. In other words, this is determined in order to protect the person being measured from being left unnecessarily in a state of suffocation due to unforeseen circumstances, and is preset at an optimal time depending on the person being measured. Ru. If the exhaust stop time T8 exceeds the employee power outage time T2, step S14 is executed and the pressure in the manchette 10 is rapidly lowered, but in a state where the exhaust stop time T8 does not reach the maximum stop time T2. Then, the next step 812 is executed, and 17- it is determined whether at least two normal pulse waves have occurred in succession. That is, the magnitude of the preceding pulse wave signal SM and the magnitude of the current pulse wave signal SM are compared, and if the intensification rate of these magnitudes is within a certain range, it is determined whether the pulse wave is normal or continuous. It is judged as a thing.

If normal pulse waves have not yet occurred continuously, step S11 will be executed again, but if they have occurred continuously, step S13 will be executed, and the output of the exhaust stop signal SL will be blocked again and the manchet will be removed. 10 pressure drops are resumed. At time E in Figure 3, no sound is produced in this state.

In this way, according to the present embodiment, the pressure drop in the manchette 10 is prevented during the period when noise that causes erroneous measurements is mixed in, so that the systolic blood pressure that occurs when the noise is mixed in and in the process of pressure drop in the manchette is This avoids overlapping with the measurement timing of the blood pressure value or the maximum blood pressure value, and automatic blood pressure measurement becomes possible even if noise continues for a certain period of time. Therefore, noise in measurement is eliminated, which is particularly effective in automatic measurement over a long period of time to measure trends in blood pressure values. Moreover, compared to the conventional automatic blood sweat measurement in which the pressure in the manchette is increased in stages, the compression period of the manchette 10 only increases by the period when noise is mixed in, and the pressure in the manchette 10 is continuously lowered. Therefore, the patient's pain hardly increases, and highly reliable blood pressure measurement values can be obtained.

Next, another embodiment of the present invention will be described.

In steps S8 and S9 in the above-described embodiment, it is determined that there is noise when the change in the pressure increasing force direction of the manchette 10 is greater than a predetermined value α. It may be determined that noise is present when the speed (inclination) exceeds a predetermined constant value β. For example, as shown in FIG.
The pressure P is read every fixed time △T, and step sg
', the utility difference △P between the previous pressure value Pn of the manchette 10 and the current pressure value Pn+1, that is, the amount of change (change speed) per time △T, is greater than the predetermined value β. is large, step S
] o is executed, and if it is small, step S7 is executed.

In some cases, even if the amount of change in the pressure increase direction of the six manchette 10 does not reach the value α, there is an advantage that high frequency noise can be detected, and noise that changes in the pressure decrease direction can also be detected.

Although one embodiment of the present invention has been described above based on the small drawings, the present invention can also be applied to other aspects.

For example, in the flow chart of FIG.
9 and 810, step 88 of the other embodiments described above.
' and S9' may be inserted. In such a case, it is difficult to judge whether the pressure change trot and the focus change in the pressure increase direction of the manchet 1O are noise, so there is an advantage that a more reliable blood pressure measurement value can be obtained. As a method of detecting the noise, if the magnitude of the pulse wave signal SM is greater than a predetermined constant value or if the pulse wave signal
If the rate of change in the magnitude of M exceeds a certain rate of change, it is no problem to judge it as noise, but it is recognized by means of pattern exploration of the vibration waveform included in the manchet focus signal SK, and is recognized as a pulse wave. If a vibration waveform other than the wave pattern is recognized, it may be determined as noise. Moreover, reading of the pressure in step S8 may be performed periodically for a short period of time (about 4 msec) as necessary.

A step may be inserted between steps 812 and 813 in the embodiment described above to increase the pressure again by a predetermined amount of pressure prior to venting and opening.

Solenoid valve 1 for restarting the bleed air in such cases
In order to reduce the noise generated due to the operation of the electromagnetic valve 18, even if the pulse wave signal SM which is generated manually when the solenoid valve 18 is actuated is canceled, the pressure value of the manchette 10 of the Gyansel city and the basis force of step S10 are This also has the advantage of preventing the pressure value from increasing, and eliminating the possibility of overlapping the pressure value of the manchet 10 and the occurrence of a dead zone within the blood pressure measurement range in which blood pressure measurement is impossible.

21- The A/D converter 24 can be driven in a time-division manner to convert the pulse wave into a code signal and output the pulse wave signal SM at a certain time. In such a case, an A/D converter in the pulse wave sensor 22 is not required, which has the advantage that the device h is inexpensive.

In the above-described embodiment, the blood pressure measurement is not configured to be performed during the pressure reduction process of the sleeve 10.
Blood pressure is measured during the process of increasing the pressure in the cuff 10, and the pressure increase in the cuff 10 may be configured to be able to be prevented by applying a noise-generating sticker during the blood pressure measurement. In such cases, Manshera) 10
There is no need to raise the pressure above the systolic blood pressure value, so
This has the advantage of shortening blood pressure measurement time and reducing pressure on the person to be measured.

In the embodiments described above, the noise detection device includes the CPU 32
, RAM 34, and R0M36, for example, the pressure signal S representing the pressure of 10 (Mansherra) 22- It may also be configured by an analog circuit that includes a comparator for determining and outputs an indication of abnormality when noise is detected.

In the above-mentioned embodiment, the pressure stop means) is constituted by a solenoid valve 18 that prevents exhaustion, or in a device that measures blood pressure when the pressure of the manchet 10 increases, an intervening device is provided between the air horn 14 and the conduit 20. In other words, the blood pressure measurement in the above-described embodiment is performed using a solenoid valve that blocks air supply to the cuff 10 or a switch that blocks the supply of driving gravity to the air pump 14.
The best blood pressure and The four inventions can also be applied to a well-known automatic blood pressure monitor configured to measure the diastolic blood pressure value. In such a case, instead of the pulse wave sensor 22 shown in FIG. 1, a microphone or the like that detects blood vessel sounds in a part of the compressed material and outputs a blood vessel sound signal without expressing the blood vessel sounds may be used. It is equipped with a blood vessel sound sensor and a bandpass filter detection device i+ that discriminates and detects pulse sounds, Korotkoff sounds, and noise contained in the blood vessel sound signals, and detects pulse signals that represent pulse sounds and Korotkoff sounds that do not represent Korotkoff sounds. The signal and the noise signal representing the noise are respectively configured to be supplied to the I/O boat 26 and operate according to a flowchart similar to that shown in FIG. Note that the noise is a sound included in the blood vessel sound signal, a sound with a frequency different from frequency band 1 of the pulse sound and Korotkoff sound, and/or a sound in the frequency band 1 of the Korotkoff sound when no pulse sound is generated. Steps S8 and S9 in FIG. 2 are slightly different in that they are configured so that the sound is detected. That is, steps S8 and S9 are changed to steps in which step S10 is executed when the first noise signal is output from the noise detection device, and step S7 is executed when the output is at its peak. However, the above-mentioned embodiment is merely an example of the present invention, and various changes or additions may be made to the present invention without departing from the spirit thereof.

As mentioned above, according to the automatic surface pressure measuring device of the invention, the pressure changing force of the cuff is blocked during automatic blood pressure measurement during the period when noise that interferes with blood pressure measurement is mixed. The timing of noise contamination and the timing of measuring the systolic or diastolic blood pressure values, which occur during the pressure cracking process of the cuff, are avoided, and automatic blood pressure measurement is possible even if noise contamination continues for a certain period of time. There it is.

Moreover, compared to conventional automatic blood pressure measurement in which the pressure of the cuff is not changed in stages, the compression period by the cuff is only increased by the period of noise, and the pressure of the cuff can be changed continuously. , the patient's pain hardly increases, and highly reliable blood pressure measurements can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating the configuration of an embodiment of the present invention. FIG. 2 is a flowchart illustrating the operation of the embodiment shown in FIG. 3 and 4 are graphs illustrating the operation of the -25= embodiment of FIG. 1. FIG. 5 is a partial flowchart showing another embodiment of the invention. 10: Manchette 12: Pressure sensor 18: Solenoid valve (pressure stop means) Applicant: Nihon Kolin Co., Ltd. 26- Fig. 5 Fig. 4

Claims (6)

[Claims] (1) An automatic surface pressure measuring device that is equipped with a cuff that changes the compression state of a part of the human body by raising or lowering the pressure when measuring blood pressure, and that measures blood pressure based on pulse waves that appear as pressure vibrations of the cuff. A pressure sensor that detects the pressure inside the manchette and outputs a pressure signal without indicating the concentration, and a noise sensor that detects noise included in the specific force belief and outputs an abnormal signal indicating the presence of the noise. the pressure of the interlock manchette by stopping the supply of fluid supplied to the manchette or the discharge of the fluid previously supplied to the manchette while the said wrong female signal is being outputted; The automatic surface is characterized by being provided with a pressure cut-off means for temporarily stopping the rise or fall, allowing the pressure change in the manchette when the noise is not present, and preventing the pressure from emerging when the noise is present. Pressure measuring device white. (2) The noise detection device 6 outputs an abnormal signal when the amount of pressure change in the direction opposite to the pressure change direction of the manchette exceeds a predetermined constant value. The automatic blood pressure measuring device described in Section 1. (3) The noise detection device outputs an abnormal signal when the amount of pressure change in the manifold per a certain period of time exceeds a predetermined certain value. Automatic blood pressure measuring device &. (4) When the pulse wave included in the pressure signal continuously increases after the noise detection device outputs the abnormal signal, the output of the abnormal signal is canceled. An automatic blood measuring device according to any one of claims 1 to 3. (5) An automatic cuff that measures blood pressure based on the Korotkoff sounds included in the blood vessel sounds generated by a squeezed human body, equipped with a cuff that changes the compression state of a part of the human body by raising or lowering the pressure when measuring blood pressure. A blood pressure measuring device detects blood vessel sounds in the compressed part of the body, and outputs a blood vessel sound signal without representing the blood vessel sounds, and a blood vessel sound sensor that detects noise included in the blood vessel sound signals. , a noise detection device i'1 that outputs an abnormal signal without detecting the presence of the noise.
and, while the abnormal bullet is being outputted, the pressure in the bank is increased by stopping the supply of fluid supplied to the bank, or the discharge of the flow previously deposited in the bank. Alternatively, it is characterized in that it is provided with a utility power stopping means for stopping the descent at a certain time, so that the pressure change in the manchet is corrected in the month when the noise is not present, and the nuclear utility power change is prevented in the period when the noise is present. automatic blood pressure measuring device 1″]. (6) When the noise detection device 11 detects that the sound included in the blood vessel signal is a sound with a frequency different from the frequency band of the Korotkoff sound and the pulse sound, and/or when the pulse sound is not generated, The automatic blood pressure measuring device according to claim 5, which outputs an abnormal signal when the sound has a frequency in the frequency band of the Korotkoff sound.