JPS58127634A - Apparatus for controlling pressure change and speed of manschet in 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 a device for adjusting pressure changes in a manchet in a blood measuring device, and particularly to a device for adjusting pressure changes in a manchette per beat in order to improve measurement accuracy. The present invention relates to an adjusting device having a function of adjusting speed and constantness.

A divine regulating device is provided to regulate the rate of pressure drop in a part of the human body that is compressed during blood pressure measurement. For example, the gas discharged from the exhaust valve may be adjusted depending on the pressure inside the manchette, or the gas υ1− of exhaust)f may be adjusted so that the pressure drop rate within the manchette follows a predetermined reference pressure drop speed. It is the thing that adjusts the budget. According to such a device, regardless of the pressure value inside the manchette or the capacity of the manchette,
Although there is a %Ir characteristic in which a substantially constant pressure drop rate can be obtained, there is a drawback that high measurement accuracy cannot necessarily be obtained for a wide range of subjects. In other words, with such conventional devices, since the rate of pressure drop per hour is constant, the pressure drop needle per beat changes depending on the pulse rate of the subject, resulting in variations in blood pressure measurement accuracy. It is to be shuffled. Incidentally, when measuring the blood pressure of a patient with a low pulse rate of about 30 to 40 beats per minute, the measurement accuracy is reduced to about half that of blood pressure measurement of a normal person.

The present invention has been made against the background of the following two circumstances, and its main feature lies in providing 4 pulses per beat.

In order to achieve such an object, the present invention provides gas υ1:
A pressure change speed regulating device for a manchette in a blood pressure measuring device which adjusts the amount of gas supplied to the manchette and controls the pressure change speed of the manchette, the device comprising: (1) Pressure inside the manchette I-; (2) a pressure sensor that detects the pressure and sends a signal indicating the pressure;
riiJ A pulse wave signal that detects the pulse wave of the human body and synchronizes with the pulse wave? a pulsation detector that outputs; (3) a gas discharge meter from the manchette or a flow rate adjustment device that changes the gas supply to the manchette; (4) based on the pressure signal and pulse wave signal; , Full calculation of the actual pressure change meter of the manchette between the pulse wave signals (~, Next, based on the actual pressure change meter and a predetermined constant target pressure change per pulse wave - 5 = , a control device that determines a change meter signal so that the actual pressure change meter during successive pulse waves is equal to the target pressure change number, and causes the flow rate adjustment device to adjust the pressure change rate in accordance with the change meter signal. It is characterized by

In this way, the number of pressure change meters per pulse wave of the sleeve is controlled to a predetermined constant number, so that high blood pressure measurement accuracy can always be obtained regardless of the pulse rate of the patient. The time required for the measurement person to compress the cuff is kept to the minimum necessary.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below based on the drawings. .

In FIG. 1, a pressure sensor 2 is connected to a bag-shaped manchette 10 for compressing a part of the human body, which detects pressure cracks in the manchette 10 and outputs a pressure signal SP representing the pressure. The pressure signal S l' is supplied to a pulse detector 14 and an A/D controller 16.

The pulsation detector 14 is composed of a vanufilter A/'D converter, and detects the pulse wave (vibration component) contained in the A-no-zuki A 81' and detects the magnitude of the pulse wave. The converter 6 [equipped with a low-pass filter, converts the pressure signal 81゛ into digital code] The pressure signal S + ゛I) is converted from 1 to l/'(l
3 is output to port 18, and on the other hand, a start push button SW1 is provided to command the start of measurement.
・Push button i'lWl is pressed 1: When operated, a start signal S8 is supplied to the l/'0 port 18. 1, /IJ boat 18 is connected to C,
l:' D (Enpei Ni treatment! So: i'?, ) 20
, H, A M 22 and R(,) M 24, (1) -
Power signal 'j' S l'I', pulse wave signal 8M and nutat signal bow SS are supplied to the data bus line. Cl)
U 2 Q uses the temporary storage function of ILAM 22 according to the program stored in It OM 2 '4 in advance and uses the signal processing Jt 1! Full execution and I/'(1) pump drive signal via boat 18-SA and displacement signal S
E to pump drive circuit 26 and pulse motor drive circuit 2
Supply to 8.

While receiving the pump drive signal SA, the pump drive circuit 26 supplies driving power to the electric pump 30 connected to the manchette 10 to pump air into the manchette 10. The pulse motor drive circuit 28 has a discharge signal Sry
Based on this, the pulse motor 34 of the control valve 32 drives the drive valve signal 8D for driving a predetermined rotation angle so that the discharge needle (valve opening degree) represented by the wandering quantity signal SE is obtained.
supply to.

This control valve 82 is connected to the exhaust passage 36 of the mancheras 1 to 10.
The valves are connected in a row, and the amount of gas discharged from the mansherra 10 is adjusted by changing the opening degree of the valves. That is, the control valve 32 and the pulse motor drive circuit 28 constitute a flow adjustment device 38 that controls the gas discharge tk from the manchette 10 in accordance with the discharge amount signal SE.

In addition, the CPU U3O, l circle AM22 and ItOM
24 is a control a11 device which outputs the full discharge amount signal S1' based on the pressure signal S1'1) and the pulse wave signal SM.
has been completed.

As shown in FIG. It is designed to be continuously adjusted according to the rotation meter. That is, the main body 40 includes a cylindrical plunger 42.
A cylinder bore 44 in the form of a circular hole with a bottom and a small-diameter circular hole 46 with a bottom that is fitted into the cylinder bore 44 is formed. The valve chamber 46 has connecting ports 1 and 4 to which the air port 48 and the exhaust passage 36 are connected.
A 7f seat 50 is formed in a portion where a passage communicating with the exhaust ports 1 and 48 opens into the valve chamber 46. On the side of the valve chamber 4.6 of the plunger 42, a small diameter portion 52 that fits into the 4” chamber 46 and a tapered two-way no.↑ portion 54 following the small diameter portion 52 are formed, and the shaft of the plunger 42 is formed. -J by flJr position in direction
The flow cross-sectional area between the f-seat 50 and the needle valve portion 54 can be changed.

A pulse motor 84 is fixed to the main body 40 via a bracket 56 (9-), and a plunger A/
A cam 60 is fixed to the output shaft of the cylinder 42, which is perpendicular to the tiQ11 direction, and the end of the plunger 42 is engaged with the cam 60 by a compression coil spring 62 inserted in the cylinder bore 44.

Furthermore, 1. The display signal 1) 1) is output from 0 baud 1-18 to the display 61, and the blood pressure '6+il fixed value is displayed numerically.

The operation of this embodiment will be explained below.

When a power switch (not shown) is turned on, power is supplied to each part of the device, and the cPU 20 switches to 70-ch~=1 in FIG. 3, which shows the main program stored in advance in the ROMg2.
・Perform control operations according to the following.

First, step 81 is executed, and the operating state of the start push button 8Wl is determined. The execution of step 81 is repeated while the start push button SW1 is not operated, but when the start push button SW1 is pressed to start blood pressure measurement, the next steps S2 and 83 are executed. That is,
In step S2, the pump drive multiplier ky SA is supplied to the pump drive circuit 26, and air starts to be pumped into the manchette 10 from the electric pump BO, and at the same time, in step S3,
The actual pressure 1' in the manchette 10 represented by Senrikigaego S I' I) is the preset upper limit pressure IJV.
It is judged whether or not it is better than I. While the actual pressure I' is still smaller than the target - 1 = limit pressure PM, step S
3 is repeated, but on the other hand, if the actual pressure 1) exceeds the target upper limit pressure 1'M by 1, step S4~Y is repeated.
S5 is executed. That is, in step S4, the pump drive signal 8A output is canceled and the electric pump 3
At the same time, in step S5, the exhaust signal +jSE is supplied to the valne motor 34 to drive the valne motor 34, and the control valve 32, which had been in the fully closed state, is turned off to the preset initial state. lυ] Open only those gauges suitable for exhaust.

After that, in step S6, it is determined whether or not the measurement completion signal 11 is being supplied from the measurement circuit (not shown). If it is being supplied, the main program is immediately terminated, but the suppression measurement is not yet completed and the measurement If the completion signal jI is not supplied, step S7 is executed and it is determined whether the pulse wave signal SM is supplied. In a state where the pulse wave signal S fVI is not yet supplied, steps S6 and S7 are repeated;
The vibration waveform (alternating current component in a relatively low frequency band) in the pressure signal 1fj-8P accompanying the pulsation is detected by the pulsation detector 14, and the pulse wave signal S~1 is detected as 1. /' (1) When supplied to the boat 18, the exhaust control routine of step S8 is executed, and then IJ) and step S6 are executed.

The 1F unloading routine is executed according to the flowchart of FIG. First, in step S It 11tC, the pressure signal 5P1) when the pulse wave signal SM is supplied
The actual pressure P2 inside the manchette 10 represented by is read 1.
Then, in the next step 51 (2), the immediately previous pulse wave signal H
It is determined whether the actual pressure P·, in the manchet lo at the time of occurrence of M is stored.

If the pressure P is not stored, the exhaust control routine ends immediately and the main program returns to step S6.
The pressure is 13. Step S N-3 is executed for the table in which pressure 1 is stored and pressure 1 is stored.
A differential pressure Δ1' of 2 is simulated. This differential pressure Δ1'' is the actual pressure drop (change) in the mancheto per one interval of the pulse wave SM, in other words, per one heart beat of the human body. Then, in step SR4, it is determined whether the actual pressure drop amount Δl' is larger than a preset target pressure drop per beat. This target pressure drop needle A is, for example, 2 to 8 mm, 1-1. It is set to a value of about g. In addition, the pressure drop FA during blood pressure measurement is often expressed as 2 to 8 mm l-1g/'s, but this is due to the difference in the pulse rate of the person measuring the pressure per beat. Because it is difficult to keep the amount of descent constant, it is displayed as an average value.

If the actual pressure drop amount ΔP is larger than the target pressure drop needle A, steps S R and 5 are executed to keep the exhaust gas constant.
The discharge 1*signal 81 噸) for reducing the size is supplied to the bar 13-Lunu motor drive circuit 28, and the Valne motor 84
141 force +UI+ is driven to rotate at a constant angle (in the direction around the cloth in FIG. 2), and the valve opening degree of the control valve 82 is reduced by a constant number. On the other hand, if the actual pressure drop amount 8P is smaller than the target pressure drop amount A, step 5IL6 is executed;
According to the reverse operation of step S5, the opening of the control valve 82 is increased by a certain amount, and the amount of air discharged from the manchette 10 is increased.

That is, in steps 8141 to SR3, the actual pressure drop amount Δ of the manchet 10 between the pulse wave signals is determined in advance.
P is calculated, and in steps SR4 to SIL5, the actual pressure drop is adjusted based on P and the target pressure drop needle A in a direction in which the actual pressure drop between the next pulse waves approaches the target pressure drop iA. 10 air emissions are controlled.

When the execution of step 5IL54 or s+t6 is completed, steps 86 and subsequent steps of the main program are executed again.

Then, steps SR, 1 to 5IL5 of the above routine are followed to generate the pulse wave signal SM.
- Repeat for each pulse wave signal SM, so that the pressure drop W1Δ1' between the pulse wave signals SM and M at the time of 1-10 becomes equal to the target pressure drop A.
It will be done.

For blood pressure measurement, according to a program (not shown), the pressure in the manchette 10 at the time when adjacent pulse wave signals (large peak value of >7 s M) suddenly increases is determined as the systolic blood pressure.
The pressure in the manchette 10 at the time when the pressure suddenly decreases is taken as the lowest surface pressure, and that value is displayed on the display 61. In such cases, the pulse wave signal 1 should be sent before the blood pressure measurement.
Since I-j'i'1M is generated continuously, the pressure drop in the manochette 10 between pulses is already controlled to be constant in the pressure range in which blood pressure measurement is performed.

As described above, according to this embodiment, the pressure drop discharge per pulse wave signal SM of the manchet 10 is controlled to a predetermined constant target capacity drop lA, so that the pulse rate of the subject is High measurement accuracy is always obtained regardless of the
The time required to compress the cuff 10 against the subject is minimized.

-Also, the adjustment-j+82 in this embodiment is performed by the pulse motor 8.
Since the valve opening degree is adjusted smoothly and continuously by the rotational drive of step 4, the air exhaust effect can be adjusted by repeatedly opening and closing the exhaust valve intermittently and changing the time ratio (duty) of opening and closing. Compared to conventional control valves, the structure eliminates pressure fluctuations within the cuff 10 caused by the operation of the control valve, which degrades the accuracy of automatic blood pressure measurement, and also eliminates the pressure fluctuations in the cuff 10 that are difficult to detect. This enables reliable blood pressure measurement even for elderly people, infants, and critically ill patients with weak pulsations.

Next, another embodiment of the present invention will be described. In the following explanation, the same reference numerals and symbols are used for parts common to the above-mentioned embodiments.
will be added and the explanation will be omitted.

Step SIt in the υ1 mi breath-control routine in Figure 4
4 to s+t6 are steps SR4' and 5l in FIG.
j4//, 8 IL 5 and 5lt6. That is, 1 drift pressure drop amount Ai is a constant value having an upper limit value Al and a lower limit value A2, and the actual pressure drop amount Δ1 is between the upper limit value A1 and the lower limit value Δ2. "S I (Full output [7
However, when the actual pressure drop surface Δ1' exceeds the upper limit value A 1 f, step 5It5 is executed, and when the actual pressure drop amount Δ1' falls below the lower limit value A2, step SR56 is executed. According to this embodiment, the target pressure drop A is L
Since it has a width (dead zone) between the limit value A1 and the lower limit value A2, there is an advantage that +Ii control is stable.

Similarly, steps 8144 through 5lt6 in the 1:Il:Kiken Shun 11 routine of FIG. 4 may be structured similarly to steps 51-L7 and 514B of FIG. That is, in step 5IL7, the deviation Δ1' between the actual pressure drop meter ΔP and the target pressure drop meter A is calculated, and in step 81t8, the valve opening of 82 is adjusted in proportion to the deviation ΔI'. is adjusted.

For example, if the actual pressure drop gauge Δ1 is slightly twice the target 11; force drop amount A (Δ1 bow is +E)
The valve opening of the control valve 32 is slightly increased, and if the actual pressure drop ΔP is significantly lower than the target pressure -) and the JR vertical scale is also significantly lower (Δ1 is negative), the opening of the adjustment valve 32 is increased significantly. It is controlled so that the deviation ΔE becomes zero. According to this embodiment, by inputting a small number of pulse wave signals SN1, the actual pressure drop amount is immediately increased by 1.
' is controlled to be the same as the target pressure drop variance A.

Adjustment-/T'82 is constructed as shown in FIG.
t is also fine. That is, the main body 64 has a cylindrical hole 6 with a bottom.
6 is formed, and an insertion hole 70 communicating with the exhaust port 1-68 is formed perpendicular to the bottom of the hole 66, and one end of the exhaust passage 86, which is a soft elastic tube, is inserted into the insertion lower 0. has been done. A cylindrical member 74 having a suppressing protrusion 72 formed toward the exhaust passage 36 is screwed into the hole 66. connected in series.

That is, a pinch valve is configured in which the pressing protrusion 72 changes the entire flow cross-sectional area of the exhaust path 36 as the output shaft of the pulse motor 84 rotates.

Hereinafter, an embodiment of the present invention has been described based on FIG. 1m, but the present invention can also be applied to other embodiments.

For example, in the embodiment described above, the manchet 10
The pressure of the manchette is decreased by 1ffi, and the pressure drop rate when the blood pressure is determined in the process of 1 * Blood strands may be measured during the column process, and the rate of pressure rise during the process of rise may be controlled.

The flow rate adjustment device in this case is constituted by an adjustment 4F for adjusting the air supply meter to the manchette 10, a pump drive circuit for adjusting the total rotational speed of the pump 30, and the like. .

The A/I) converter included in the A/I) comparator 16 and the pulsation detector 14 in the embodiment described above is:
Ql-A with multiple channels and time-division driving
/' I) A converter can also be configured.

The period of the pulse wave represented by the pulse wave signal S IVI is 25%.
A program is prepared in advance to determine that an arrhythmia has occurred if the value exceeds the above, and if an arrhythmia occurs, the STELLAR 7'SR5 and S in the exhaust control routine
The execution of Il, 6 may be performed in parallel.

Similarly, it is also possible to provide a noise detection circuit so that the operation of the exhaust control routine is stopped when noise is mixed into the pulse wave multiplier ISM.

The output filter that is included in the pulsation detector 14 in the previous embodiment and detects the pulse wave, which is the pressure vibration of the manchet 10, is composed of not only an analog filter but also a digital filter element, and is Alternatively, the pulse wave signal Q°S M may be extracted from the pressure signal S t' converted into a coded signal by a desigle filter process according to a stored program.

The pulsation detector 14 in the embodiment described above is the pressure sensor 12.
Although the pulse wave is detected from the pressure signal SP output from the human body, the pulse wave is also detected from the output signal of a microphone placed close to the human body in order to detect Korotkoff sounds. You can also do it. In this case J,
Generally, a pulse sound occurs before the Korotkoff sound occurs, so it is sufficient to supplement the pulse sound.

Well, there is no problem with the adjustment J "32 is a servo motor. For the actuator of the solenoid etc.", it is possible to use two parts to adjust the air flow meter.

Furthermore, (Book 'LI 2 Q, ItAM 22,
ILf) M24 Oyohi 1. / (,) The board I-18 can also be constructed by a so-called one-chip or one-board microcomputer.

Furthermore, what has been described above is merely one embodiment of the present invention, and the present invention may be modified in various ways without departing from its spirit.

As described in detail below, according to the exhaust device of the manchette 1 in the blood pressure measuring device of the present invention, the pressure drop needle per pulse wave of the manchette is controlled to a predetermined constant amount. Regardless of the pulse rate of the person to be measured, blood pressure measurement can always be performed with a high precision, and the time for compressing the cuff on the person to be measured is minimized.

[Brief explanation of the drawing]

(n1) Figure 21 is a diagram illustrating the configuration of an embodiment of the present invention.
− is. FIG. 2 is a diagram showing the configuration of the control valve in the embodiment of FIG. 1. FIG. 8 is a flowchart 1-1- explaining the operation of FIG. FIG. 4 is a flowchart Y-1 showing the exhaust sterilization routine of FIG. FIGS. 5 and 6 are flowcharts 1-1 showing another embodiment of the present invention. FIG. 7 is a diagram corresponding to FIG. 2 showing another embodiment of the present invention. 10: Manciera+-12: Pressure sensor 142 Pulsation detector 88: Flow rate adjustment device Applicant: Co., Ltd. 11 Kolin 22- 41 Fig. 6

Claims (1)

[Scope of Claims] (1) When measuring blood pressure, the pressure change rate of the Kk manchet 1- is determined by fully adjusting the gas supply meter to the manchette or the gas supply meter to the manchette that presses a part of the human body. Manshera I in blood pressure measuring device with system quotient 1
A pressure change speed adjusting device i71, which detects a pressure break in the manchette and represents the output.
Detecting the E-kahinza output to ' and the pulse wave of the human body,
a pulsation detector that outputs a pulse wave signal synchronized with the pulse wave; a flow adjustment device that changes the gas discharge from the manchette or the gas supply meter to the manchette; and the pressure signal. and a pulse wave signal, calculate in advance the actual pressure change meter of the manchet between the pulse wave signals, and then calculate the actual pressure change amount and the target pressure change per predetermined pulse wave. The change needle signal is determined so that the actual pressure change meter during the subsequent pulse waves is equal to the target pressure change meter, and the flow meter adjusting device adjusts the pressure i) change rate' according to the change amount signal. 1. A pressure change rate adjusting device for a cuff in a blood pressure measuring device, characterized in that the device includes a pressure control device for adjusting f. (2) The change meter per pulse wave in the falling direction of the i'+fJ change amount times the change amount signal is determined to be equal to the target pressure change meter, and the flow rate adjustment device is and the actual pressure change meter is 1 sil
When the target pressure change amount exceeds the target pressure change amount, the exhaust flow area of the exhaust valve is reduced by a certain number, and the actual pressure change meter is reduced by 1.
A device for adjusting the rate of pressure change in a cuff in a blood pressure measuring device according to claim 1, wherein when the target pressure change t (i = below), the exhaust gas flow area is increased by a certain number. (s) m-th target The blood pressure according to claim 2, wherein when the pressure change discharge is set to a value within a certain range and the actual pressure change meter is within the certain range, the change signal is not determined. A pressure change rate adjusting device for a manchette in a measuring device. (4) The change meter signal adjusts the exhaust flow range 1 of the exhaust valve in proportion to the deviation between the actual pressure change signal and the target pressure change meter signal. 'Fh it' l fresh water range which is determined so that the magnitude of the pressure change is adjusted; the pressure change rate adjusting device 1q of the cuff in the blood pressure measuring device according to No. 2rA; The manchette in the blood pressure measuring device tT according to claim 2, wherein the valve is fully equipped with a pulse motor, and by driving the W pulse motor, the amount of air 1 dl in the manchette is continuously changed. Pressure change rate regulator l#.