JP2664939B2 - Automatic blood pressure measurement device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic blood pressure measurement device that automatically displays only a stable blood pressure value that is not affected by a living body.

2. Description of the Related Art Generally, it is known that a blood pressure value of a living body is affected by a mental state of the living body. For example, in a hospital or the like, when measuring the blood pressure of an outpatient, especially a woman, the blood pressure value is measured to be much higher than normal in the initial stage due to the patient being initially nervous. When the patient's mental condition is stabilized after the tension is released, the blood pressure value falls to a normal range and stabilizes.

Conventionally, to eliminate the mental effects in blood pressure measurement as described above, conventionally, for example, twice measured the patient's blood pressure value,
A method has been adopted in which the measurement result of the latter, which seems to have stabilized the mental state due to the patient's tension being relaxed to some extent, is adopted and displayed. However, in such a conventional method,
The latter of the two measurements is not always psychologically affected, and lacks certainty because unstable blood pressure values higher than normal may be adopted as measured values There was a problem.

Means for Solving the Problems The present invention has been made in view of the above circumstances as an object to provide an automatic blood pressure measurement device of a type that automatically measures and displays a blood pressure value under a stable mental state. The gist is to provide a cuff for compressing a part of a living body, and automatically measure the blood pressure value of the living body while changing the compression pressure of the cuff according to a predetermined procedure. An automatic blood pressure measurement device, wherein (a) determining a state in which the blood pressure value of the living body is stable based on the fact that the blood pressure value measured this time is equal to or higher than the blood pressure value measured immediately before. A determination means, and (b) display means for displaying the blood pressure value measured when the blood pressure value is determined to be stable by the determination means on a display.

In this way, the blood pressure value of the living body measured by changing the compression pressure of the cuff, the blood pressure value measured this time is equal to or higher than the blood pressure value measured immediately before. If the determination means determines that the state is stable based on the high blood pressure, the blood pressure value is automatically displayed on the display by the display means. Therefore, according to the present invention, only the stable blood pressure value is automatically adopted and displayed on the display according to the determination of the determining means, so that the unstable blood pressure value affected by the mental state is displayed. Is reliably prevented from being adopted and displayed as a measured value.

Examples Hereinafter, examples of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram for explaining the configuration of the automatic blood pressure measurement device of the present embodiment. Reference numeral 10 denotes a cuff which is in the form of a rubber bag and is wound around the upper arm of a living body, etc.The cuff 10 includes a pressure sensor 12, a quick exhaust valve 14, a slow exhaust valve 16 having a throttle, and an electric motor. The pumps 18 are connected via pipes 20, respectively. The pressure sensor 12 detects a pressure change in the cuff 10 and outputs a pressure signal SP representing the pressure change to the cuff pressure detection circuit 22 and the pulse wave detection circuit 24, respectively. Cuff pressure detection circuit 22
Has a low-pass filter, to detect a static pressure component in the pressure signal SP outputted to CPU28 the cuff pressure signal SP _C via the A / D converter 26. In addition, the pulse wave detection circuit 24,
Pressure oscillation wave generated in synchronism with heartbeat includes a bandpass filter for passing only a signal corresponding to the frequency band of (pulse wave), the pulse wave signal by detecting a pulse wave component in the pressure signal SP SP _O Is output to the CPU 28 via the A / D converter 30.

The CPU 28 constitutes a so-called microcomputer together with the ROM 32 and the RAM 34, processes input signals in accordance with a program stored in the ROM 32 in advance while using the storage function of the RAM 34, and performs a quick exhaust valve 14, a slow exhaust valve 16, and an electric motor. pump
The blood pressure measurement operation is executed by controlling the respective 18. That is, the CPU 28 outputs a command signal to the electric pump 18 via the output interface 36 to
After the pressure in the inner (cuff pressure P) to reach a predetermined target cuff pressure P _m, lowering the cuff pressure P at a predetermined speed of the order of about 3 mm Hg / sec suitable blood pressure measurement by the slow exhaust valve 16 is, in this slow decreasing period, when determining the blood pressure value from the cuff pressure signal SP _C based on the change in magnitude of the pulse wave represented by the pulse wave signal SP _O, rapidly evacuating the inside of the cuff 10 by quick exhaust valve 14 At the same time, the determined blood pressure value is displayed on the blood pressure display 38, which is the display of the present embodiment. The target cuff pressure _Pm is 180 m higher than the expected biological systolic value.
m Hg is set. Further, the CPU 28 is supplied with a start / stop signal from a start / stop push button 40.

Further, in the process of repeatedly performing the blood pressure measurement operation as described above, if the blood pressure value measured at this time becomes higher than the blood pressure value measured immediately before, the blood pressure value becomes stable. It is determined that the blood pressure has just been used, and the blood pressure value immediately before that time is adopted as a normal blood pressure value and displayed on the blood pressure display 38.
Therefore, in the present embodiment, the CPU 2 for executing the determination operation for determining whether the blood pressure value is stable as described above.
8, a ROM 32 and a RAM 34 constitute determination means, and a CPU 2 for displaying a blood pressure value determined to be stable on a blood pressure display 38.
8, ROM 32 and RAM 34 constitute display means.

The operation of the automatic blood pressure measurement device configured as described above,
This will be described below with reference to the flowchart of FIG.

First, in step S1, it is determined whether or not the start / stop button 40 is pressed and a start signal is supplied to the CPU. If it is determined that the activation signal has been supplied after the cuff 10 has been wound around the upper arm of the living body, step S2 is executed next. In step S2, the operation of the electric pump 18 is started and the rapid exhaust valve 14 and the slow exhaust valve 16 are closed, so that the pressure in the cuff 10 is increased. In step S3, whether the cuff pressure P reaches the target cuff pressure P _m is determined, is boosted cuff 10 step S2 is executed until it is determined to have reached, the cuff pressure P is a target When the cuff pressure _Pm is reached, the following step S4 is executed, the operation of the electric pump 18 is stopped, the slow exhaust valve 16 is opened, and the pressure in the cuff 10 is gradually reduced at the predetermined speed. In the blood pressure measurement routine of step S5, the cuff
The pulse wave signal SP _O detected during the above-described slow down period of 10
Based on the change in the size of the pulse wave represented by the cuff pressure signal SP _C
, The systolic blood pressure value H, the average blood pressure value M and the diastolic blood pressure value L are determined. In the subsequent step S6, it is determined whether or not the systolic blood pressure value H, the average blood pressure value M, and the diastolic blood pressure value L are both determined in step S5, and step S5 is repeatedly executed until the determination is performed. If it is determined that the blood pressure values H, M, and L have been determined, step S7 is executed. In step S7, the quick exhaust valve 14 is opened and the inside of the cuff 10 is quickly exhausted.

Subsequently, by executing step S8, it is determined whether or not the blood pressure values H, M, and L determined in step S5 are in a stable state.
Is determined to be equal to or higher than the blood pressure value H- ¹ determined immediately before. When the current systolic blood pressure value H is higher than the previous systolic blood pressure value H- ¹ , the subsequent step S9 is executed, whereby the previous systolic blood pressure value H is obtained.
^-1 , M ^-1 and L ^-1 are displayed on the blood pressure display 38.
This is because, for example, when measuring blood pressure for an outpatient in a hospital or the like, since the patient is often nervous at first, the blood pressure value measured in the initial stage is such a mental state. It is empirically evident that it is likely to be higher than at rest due to the effect, and then as the tension relaxes, the blood pressure drops once and stabilizes and then rises slightly again, This is because when the current blood pressure value becomes higher than the previous blood pressure value, it can be determined that the mental state of the living body has stabilized and the blood pressure value has already been stabilized at the time of the previous measurement. However, initially, since the living body is in a state of tension, the determination in step S8 is denied, and the blood pressure measurement operation is re-executed by executing step S2 and subsequent steps again, but in the process in which the above operation is repeated. The blood pressure value is stabilized and the determination in step S8 is affirmed, and step S9 is executed. Note that step
In S8, the current systolic blood pressure value H and the previous systolic blood pressure value
H ^-1 was compared, but the current diastolic blood pressure L and the previous diastolic blood pressure L ^-1 are compared, or the current average blood pressure M and the previous average blood pressure M ^-1 are compared. Of course, comparisons may be made.

As described above, in the automatic blood pressure measurement device of the present embodiment, the blood pressure value H, M, or L measured in the blood pressure measurement routine is the same as the immediately preceding blood pressure value H ⁻¹ , M ^−1, or L ^−1. Or if the blood pressure value is higher than those and the blood pressure value is already stable, the previous blood pressure value which is a stable blood pressure value
H ^-1 , M ^-1 and L ^-1 are automatically adopted and displayed. Therefore, according to the present embodiment, only a stable blood pressure value under a stable mental state is adopted, and the blood pressure indicator is used.
Since it is displayed by 38, it is possible to reliably prevent the blood pressure value affected by the mind from being adopted and displayed as the measured value.

As mentioned above, although one Example of this invention was described based on drawing, this invention can be suitably implemented also in another aspect.

Further, in the above-described embodiment, a so-called oscillometric method of determining a blood pressure value based on a change in the magnitude of a pulse wave generated in the cuff 10 during the deceleration step-down period of the cuff 10 has been adopted. In place of the above, a K-sound method or other method that collects Korotkoff sounds (pulse sounds) using a microphone attached to the cuff 10 and determines the blood pressure value based on the occurrence and disappearance of the Korotkoff sounds may be used. Needless to say.

The above is merely an example of the present invention, and the present invention can be variously modified without departing from the spirit thereof.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating the configuration of an automatic blood pressure measurement device according to one embodiment of the present invention. FIG. 2 is a flowchart for explaining the operation of the apparatus shown in FIG. 10: Cuff, 28: CPU 32: ROM, 34: RAM 38: Blood pressure display (display)

Claims (1)

(57) [Claims] 1. A cuff for compressing a part of a living body,
An automatic blood pressure measurement device that automatically measures the blood pressure value of the living body while changing the compression pressure of the cuff according to a predetermined procedure, wherein the blood pressure value measured this time is the same as the blood pressure value measured immediately before. Determining means for determining a state in which the blood pressure value of the living body is stable based on the same or higher, and displaying the blood pressure value measured when the blood pressure value is determined to be in a stable state by the determining means An automatic blood pressure measurement device, comprising: display means for displaying on a blood vessel.