JPH06104B2 - Electronic blood pressure monitor for fingers - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electronic blood pressure monitor for fingers, and more particularly to an electronic blood pressure monitor for fingers provided with a plurality of cuffs capable of individually pressing two or more fingers.

(B) Conventional Technology The inventor of this application has developed and has already filed an electronic blood pressure monitor for fingers that uses a pneumatic cuff (rubber air bag) similar to a wristband blood pressure monitor. Wish sho 60-78651
issue).

The electronic blood pressure monitor for fingers of this prior application is a cuff for compressing a finger, an air pressure system for increasing or decreasing the air pressure of the cuff, a cuff pressure sensor for detecting the pressure of the cuff, and a cuff pressure changing process. The pulse wave sensor for detecting the pulse wave information, and the blood pressure determining means for determining the blood pressure value by the cuff pressure from the cuff pressure sensor and the pulse wave information from the pulse wave sensor, and the finger is inserted into the cuff. , The air pressure system pressurizes the cuff, presses the finger from the surroundings, detects the pulse wave information (eg pulse wave amplitude) in the process of changing the cuff pressure, and determines the blood pressure value from the cuff pressure and the pulse wave information. ing.

(C) Problems to be Solved by the Invention Generally, in blood pressure measurement, sometimes not only data obtained by one measurement but also many data obtained by continuous measurement may be required.

On the other hand, since the electronic sphygmomanometer for fingers of the above-mentioned prior application has only one cuff and one pulse wave sensor, when performing continuous measurement, pressurization is compared to the same finger many times. It has to be done in a very short cycle, causing congestion and injury to your fingers,
Moreover, there is a possibility that a normal measured value may not be obtained. Therefore, continuous measurement could not be performed.

In view of the above, it is an object of the present invention to provide an electronic blood pressure monitor for a finger capable of immediately repeating the measurement after repeating one measurement, that is, performing continuous measurement.

(D) Means and Actions for Solving Problems The electronic blood pressure monitor for a finger of the present invention includes two measurement systems whose operation can be switched. That is, as shown in the schematic configuration of FIG. 1, the finger electronic blood pressure monitor of the present invention includes a cuff 4A for pressing the first finger, pressurizing means for supplying air pressure to the cuff, and air for the cuff. An air pressure system 5A including an exhaust means for exhausting the air, a pressure sensor 6A for detecting the air pressure of the air pressure system, and a pulse wave sensor attached to the cuff for detecting a finger pulse wave component in the pressure change process in the cuff. 7A, a first measurement system 1 including a blood pressure determining unit 8A that determines a blood pressure value based on the detected finger pulse wave component and the output of the pressure sensor, and a cuff for compressing the second finger. 4B, an air pressure system 5B including a pressurizing means for supplying air pressure to the cuff and an exhaust means for exhausting the air of the cuff, a pressure sensor 6B for detecting the air pressure of the air pressure system, and a pressure sensor 6B attached to the cuff. Finger pulse wave component during pressure change in the cuff A second measurement system 2 including a pulse wave sensor 7B for detecting, a blood pressure determining means 8B for determining a blood pressure value based on the detected finger pulse wave component and the output of the pressure sensor, and the first measurement. It comprises an operation switching control means 3 for alternately operating the system and the second measuring system in a time-sequential manner.

In this electronic blood pressure monitor for fingers, the first measurement system 1 starts to operate under the control of the operation switching control means 3, and the first finger is pressed to measure blood pressure. During this time, the second measuring system 2 is not operating and the second finger is not pressed. When the measurement in the first measurement system 1 is completed and the cuff 4A of the first measurement system 1 is exhausted, the operation of the operation switching control means 3 causes the second measurement system 2 to start operating. , Press the first finger to measure blood pressure. During this time, the first measurement system 1 is inactive. After the measurement in the second measurement system 2 is completed, the operation is switched to the first measurement system 1 again, and thereafter, the operations of the first measurement system 1 and the second measurement system 2 are alternately switched. .

(E) Examples Hereinafter, the present invention will be described in more detail with reference to Examples.

FIG. 2 is an external perspective view of a finger electronic blood pressure monitor showing an embodiment of the present invention.

The electronic blood pressure monitor for a finger of this embodiment includes a main body 11 and the main body 1.
1 and a cuff portion 12 connected by a cord wire 13.

On the upper surface of the case 21 of the main body 11, each key of the power switch 22, the start switch 23 and the clear switch 24,
Pressurization set value selector switch 2 for switching the pressurization set value
5. A display device 26 for displaying the blood pressure value and the like is provided. Although not shown in the figure,
An MPU (microprocessor unit), other electronic circuit units, a pressure pump, and the like are provided.

The cuff portion 12 is a tubular cuff storage case 27 having an oval cross section.
And two cylindrical cuffs 28A and 28B provided in the storage case 27, and pulse wave sensors 29A and 29B provided at appropriate positions on the inner hole wall of each cuff.

The cuffs 28A and 28B are air bladders having a cylindrical outer shape, and as shown in FIG. 3, they are independently connected to the main body 11 by rubber tubes 30A and 30B. In addition, the pulse wave sensors 29A and 29B respectively include the light emitting element 3
A reflective photoelectric sensor including 1A and 31B and light receiving elements 32A and 32B is used. These pulse wave sensors 29
The elements A and 29B are connected to the electronic circuit section of the main body 11 by lead wires 33A and 33B. Therefore, the cord wire 13 includes the rubber tubes 30A and 30B and the lead wires 33A and 3A.
It is a bundle of 3B.

When the finger is pressed by the cuff 28A (28B), the volume of the artery changes, so the amount of light received by the light receiving element 32A (32B) out of the amount of light emitted from the light emitting element 31A (31B) changes, and the pulse Wave components are detected.

FIG. 4 is a circuit block diagram of the electronic blood pressure monitor for a finger of the embodiment, and the components having the same reference numerals as those in FIGS. 2 and 3 show the corresponding components and components.

The cuff 28A includes a pressure sensor 34A, a slow exhaust valve 35A, and a quick exhaust valve 3 provided inside the main body 11 by a rubber tube 30A.
6A, and the pressurizing pump 37A is communicated with the cuff 28A via the check valve 38A.

The air pressure detected by the pressure sensor 34A is amplified by the amplifier 39A, and is taken into the MPU 41 via the A / D converter 40A.

The light emitting element 31A of the pulse wave sensor 29A is turned on by a command from the MPU 41, the pulse wave component obtained from the light receiving element 32A is amplified by the amplifier 42A, and the A / D converter 40A.
After that, it is also taken in by the MPU 41.

Also for the second measurement system 2, the cuff 28B, the pressure sensor 34B, the slow exhaust valve 35B, the quick exhaust valve 36B, the pressurizing pump 37B, the check valve 38B, the amplifiers 39B and 42.
The B, A / D converter 40B and the like are connected and configured in the same manner as the first measurement system 1.

The MPU 41 has a function to turn on / off the pressurizing pumps 37A and 37B by incorporating a program to be executed in a predetermined procedure.
Function for turning on / off the rapid exhaust valves 36A, 36B, A /
A function of switching the D converters 40A and 40B respectively to capture and store the cuff pressure and pulse wave data of both measurement systems, a function of measuring a blood pressure value from the cuff pressure and pulse wave data of both measurement systems, a first measurement system And a function (operation switching control means) for alternately switching the operation of the second measurement system.

The systolic blood pressure (SYS) measured by both measurement systems 1 and 2
And diastolic blood pressure (DIA) are alternately measured by MPU41
It is output by the display device 26 and is displayed on the display 26.

Next, the operation of the electronic blood pressure monitor of the above embodiment will be described with reference to the control flow chart shown in FIG.

When the power switch 22 is pressed, the system is initialized, such as clearing the memories in the MPU 41 [Step ST
(Hereinafter abbreviated as ST) 1].

Before starting the measurement, the measurer inserts, for example, the index finger and the middle finger into the inner holes of the cuffs 28A and 28B, and turns on the start switch 23. Thus, "the start switch ON or" decision is YES in ST2, to first make a measurement at a measuring system 1, [see o ₁ point of FIG. 6 (a)] pressure pump 37A is driven, The cuff is inflated to a set value (preset by the pressurization set value changeover switch 25) (ST3).

When pressurizing to the set value [see q ₁ point in (a) of FIG. 6],
The pressurizing pump 37A is turned off, and the slow exhaust valve 35A starts the slow exhaust (ST4), and the internal pressure of the cuff 28A gradually decreases [see q ₁ → r _{1 in} (a) of FIG. 6]. Amplitude ai (i = 1, 2, 3, ... N) of each pulse wave of the pulse wave component m _{1 taken in} from the pulse wave sensor 29A in the process of this slow exhaust.
And the cuff pressure pi corresponding to this amplitude ai is stored (ST
5). When a predetermined number of pulse wave amplitude data is obtained, the rapid exhaust valve 36A is turned on to rapidly exhaust the cuff 28A (ST
6). Due to this rapid exhaust, the cuff pressure drops sharply [see r ₁ point in (a) of FIG. 6]. Then, the stored pulse wave amplitude a
The blood pressure value is determined from i and the cuff pressure pi data, and the result is displayed on the display 26 (ST7).

There are various algorithms for determining the blood pressure value, but any algorithm may be used. Here, in the process of decreasing the cuff pressure, the cuff pressure at the time when the pulse wave amplitude ai exceeds the predetermined threshold value ath is determined as the systolic blood pressure P _SYS. and further a cuff pressure at which the maximum value amax of the pulse wave amplitude is determined as the mean blood pressure Pmean, the further P _SYS and Pmean, the formula (3 × Pmean-
P _SYS ) / 2 is calculated to determine the diastolic blood pressure P _DIA .

As described above, the first measurement is performed by the measurement system 1 in the period t ₁ . During this period t ₁ , the measurement system 2 does not operate. Therefore, as shown in FIG. 6 (b),
The cuff pressure is 0.

However, after the elapse of the period t ₁ , that is, the first by the measurement system 1
After the second measurement, pressurization pump 37B
Is driven [see o point _{2 in} (b) of FIG. 6], and the cuff 28B
Is pressurized to the set value (ST8). To the set value and pressurize [see q ₂ points FIG. 6 (b)], the pressurizing pump 37B is turned off, to start the slow-speed exhaust by a very slow speed exhaust valve 35B (S
T9), the internal pressure of the cuff 28B gradually decreases [see FIG.
Refer to q ₂ → r _{2 in} (b)]. During this slow exhaustion process, the amplitude ai of each pulse wave of the pulse wave component m _{2 taken in} from the pulse wave sensor 29B and the cuff pressure pi corresponding to this amplitude ai are stored (ST10). When a predetermined number of pulse wave data are obtained, the quick exhaust valve 36B is turned on and the cuff 28B is rapidly exhausted (ST11). At the same time, the systolic blood pressure and the diastolic blood pressure by the measurement system 2 are determined by the above-mentioned algorithm from the already stored pulse wave amplitude i and cuff pressure pi data, and the results are displayed on the display 26 (ST12).

As a result, the second measurement (first measurement of the measurement system 2) is performed even in the period t ₂ . This period t ₂
Then, the measurement system 1 does not operate, and the cuff pressure of the measurement system 1 is shown in FIG.
It is 0 as shown in (a).

As described above, [see o ₃ points of FIG. 6 (a)] to return to the measurement system processing 2 by the measuring is completed ST3, the process proceeds to the measurement operation of the measurement system 1 again. Then, thereafter, the measurement by the measurement system 1 and the measurement by the measurement system 2 are alternately repeated.

In the electronic blood pressure monitor of this embodiment, each finger is alternately pressed by the cuff, so that congestion can be avoided even if continuous measurement is performed.

In the above embodiment, the finger inserted into the cuff is assumed to be the index finger and the middle finger of the left hand, but it may be another finger, or may extend over the left hand and the right hand. Rather, it is desirable to measure with the same finger on the left and right.

(F) Effect of the Invention According to the present invention, two series of measurement systems each having a cuff for pressing a finger and a pulse wave sensor for detecting a finger pulse wave are provided, and the measurement systems are alternately operated. Since it is possible to do so, the pressure on the finger is intermittent even though continuous measurement is performed, so congestion can be avoided, the finger is not injured, and accurate continuous measurement must be performed. You can Moreover, since different fingers need only be inserted into the individual cuffs, even if continuous measurement is performed, there is no need to perform any special complicated operation.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of the present invention, and FIG. 2 is an external perspective view of an electronic blood pressure monitor for a finger showing an embodiment of the present invention,
FIG. 3 is an enlarged perspective view showing a cuff portion of the electronic blood pressure monitor, FIG. 4 is a circuit block diagram of the electronic blood pressure monitor for the finger, and FIG. 5 is a whole electronic blood pressure monitor for the finger. FIG. 6 is a time chart showing changes in the cuff pressure and the pulse wave component for explaining the operation of the electronic blood pressure monitor for the finger, which is a control flow chart. 1: 1st measurement system, 2: 2nd measurement system, 3: Switching control means, 4A and 4B: Cuff, 5A and 5B: Pneumatic system, 6A and 6B: Pressure sensor, 7A and 7B: Pulse wave sensor, 8A / 8B: Blood pressure determination means.

Claims (1)

[Claims] 1. A pneumatic system including a cuff for compressing a first finger, a pressurizing means for supplying air pressure to the cuff, and an exhausting means for exhausting air from the cuff, and an air pressure of the pneumatic system is detected. A pressure sensor, a pulse wave sensor attached to the cuff, which detects a finger pulse wave component in the pressure change process in the cuff, and a blood pressure based on the detected finger pulse wave component and the output of the pressure sensor. A first measurement system including a blood pressure determining unit that determines a value, a cuff for pressing the second finger, a pressurizing unit that supplies air pressure to the cuff, and an exhaust unit that exhausts the air in the cuff. An air pressure system that includes, a pressure sensor that detects the air pressure of this air pressure system, a pulse wave sensor that is attached to the cuff and that detects a finger pulse wave component in the pressure change process in the cuff, and the detected finger pulse wave Determine the blood pressure value based on the component and the output of the pressure sensor An electronic blood pressure monitor for a finger, which comprises a second measurement system including a blood pressure determining unit for operating the blood pressure, and an operation switching control unit that alternately operates the first measurement system and the second measurement system in a time-sequential manner.