JPH0480690B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to an electronic blood pressure monitor that employs a manual cuff compression method.

(b) Summary of the invention This invention calculates a target value for re-pressurization when insufficient pressurization is detected in an electronic blood pressure monitor.
By displaying this re-pressurization target value, re-pressurization can be performed appropriately.

(c) Conventional technology Generally, electronic blood pressure monitors use a cuff that is wrapped around the upper arm, etc.
The cuff pressure is increased by pressurizing with a pressurizing means such as a rubber ball, the blood flow is stopped, and the cuff is then slowly evacuated. Korotkoff sound is generated and disappears during the slow evacuation process, and the cuff pressure data or pulse wave can be detected. The systolic blood pressure and diastolic blood pressure are determined from the data and cuff pressure data. This type of electronic blood pressure monitor detects insufficient pressure during the process of reducing cuff pressure, and if insufficient pressure is detected, a re-inflation instruction is displayed to prompt re-inflation. be. As a specific example of insufficient pressurization detection, for example, in the case of the Korotkoff sound method, determination is made based on whether Korotkoff sounds are obtained within a predetermined time after entering slow exhaust.

(d) Problems to be solved by the invention When the above-mentioned conventional electronic blood pressure monitor detects insufficient pressurization and displays a message to that effect, the measurer moves on to re-pressurize. Because it is difficult to confirm how far the pressurization has progressed before moving to exhaust, insufficient pressure may be detected again even after repressurization, requiring additional pressurization, or conversely, overpressurization results in wasted measurement time. However, there was a problem in that the person being measured was forced to suffer.

In view of the above, an object of the present invention is to provide an electronic blood pressure monitor that can perform appropriate pressurization.

(e) Means and operation for solving the problems As shown in the schematic configuration of FIG. 1, the electronic blood pressure monitor of the present invention includes a cuff 1, a pneumatic system 2 that pressurizes or depressurizes the cuff, A measurement data detection unit 3 that detects data for determining blood pressure including cuff pressure during the cuff pressurization/decompression process, a blood pressure determination unit 4 that determines blood pressure based on the measurement data, and displays the determined blood pressure value. display means 5 for detecting insufficient pressurization, insufficient pressurization detecting means 6 for detecting insufficient pressurization, and re-inflation for calculating a target value of cuff pressure to be re-inflated in response to the insufficient pressurization detected by the insufficient pressurization detecting means. Target value calculation means 7;
The repressurization target value display means 8 displays the calculated repressurization target value.

In this electronic blood pressure monitor, the cuff 1 is operated by the pneumatic system 2.
During the depressurization process after pressurization, when insufficient pressurization is detected by the pressurization shortage detection means, a repressurization target value to be targeted at repressurization is calculated accordingly, and a repressurization target value display means is displayed.

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

FIG. 2 is a block diagram showing the circuit configuration of an electronic blood pressure monitor in which the present invention is implemented. In the figure, the cuff 11 is connected to a pressurizing rubber bulb 13, an exhaust valve 14, and a pressure sensor 15 through a rubber tube 12. Air pressure within the cuff 11 (cuff pressure) is converted into an electrical signal by a pressure sensor 15, further converted into a digital signal by an A/D converter 16, and then input into a microcomputer 17. Also, K sound (Korotkoff sound) on cuff 11.
A sensor 18 is attached, and the signal detected by the K sound sensor 18 is configured to be input to the microcomputer 17 via an amplifier 19 and a filter 20. Note that 21 is a display that displays the current cuff pressure, the maximum value of the pressurized cuff pressure, the target value of the cuff pressure to be re-inflated, the determined systolic blood pressure and diastolic blood pressure, etc., and 22 is a buzzer for notification.

The microcomputer 17 executes a series of processing operations for blood pressure measurement according to a program stored in a built-in memory (ROM).

Next, the operation of the electronic blood pressure monitor of the above embodiment will be explained with reference to the flowchart shown in FIG.

When the power is turned on and operation starts, initialization such as resetting memory registers and flags is performed [step ST (hereinafter abbreviated as ST)].
1], at this point, the display 21 displays a mark indicating that measurement is possible and a current cuff pressure of 0, as shown in FIG. 4a.
0 is displayed to indicate. Subsequently, in ST2, it is determined whether or not the cuff is pressurized, that is, whether or not the cuff pressure is increasing.
If pressurization is not performed, the current pressure pc(n) is displayed on the right side of the display 21 at each sampling time in ST3, and when pressurization starts, it is displayed on the right side of the display 21, and then in ST4. , the current cuff pressure pc(n) and the previous cuff pressure pc(n-1) are compared. At the time of first sampling, the previous cuff pressure is 0, so
The current cuff pressure pc(1) is stored as the maximum value,
It is displayed on the left side of the display 21 (ST5). and,
At ST6, it is determined whether the pressurization has stopped or not, but the rubber ball 13
During pressurization, this determination becomes NO, the process returns to ST2, and the processes of ST2 to ST6 are repeated at each sampling time. That is, the current cuff pressure pc(n) read at each sampling time and the maximum value up to that point are displayed on the display 21. During pressurization, for example, as shown in FIG. 4b, the display 21
The current pressure is displayed on the right and the maximum value is displayed on the left.

When the pressurization is stopped, that is, when the pressure on the rubber bulb 13 is stopped and the transition is to slow exhaust, the judgment of ST6 is YES.
Then, it is determined whether or not insufficient pressurization has been detected (ST7). For example, when the pressure is stopped, that is, when the measurement is started, the maximum value is 152 mm as shown in Figure 4c.
If the current value of Hg is 145mmHg, the maximum value display will stop updating at this point, and the current pressure display on the right side will decrease with slow exhaustion.

When insufficient pressurization is detected in ST7, the process moves to ST8, where a pressurization instruction is displayed. This pressurization instruction is displayed as an upward arrow in the center of the display 21, as shown in FIG. 4d. In addition, the maximum cuff pressure PMAX at the time of stopping pressurization is set to a predetermined value α (e.g. α=
30) is added, and the target value PMAX + α at the time of re-pressurization
is displayed on the display 21 (ST9). This re-inflation target value is displayed on the left side of the display 21 in place of the previous maximum cuff pressure value, as shown in FIG. 4d.

The measurer looks at the upward arrow display and knows that the current pressurization was insufficient, and also looks at the re-pressurization target value displayed on the left side of the display 21, and if re-pressurizes, set it to 182 mmHg. You can know what to do if you pressurize up to

Following the display of the re-pressurization target value in ST9, it is then determined whether pressurization has been restarted (ST10). When the measurer looks at the upward arrow display and pressurizes the cuff 11 again using the rubber ball 13, it is determined whether the pressure is ST10.
YES, and then it is determined whether the current cuff pressure pc(n) has reached the re-inflation target value PMAX+α (ST11),
As long as the current pressure pc(n) is smaller, pressurization by the measurer continues, and the current pressure display on the right side of the display 21 increases. An example of the display during this repressurization is as shown in FIG. 4e. The measurer only has to continue applying pressure until the current pressure displayed on the right side of the display 21 becomes equal to the re-pressurization target value on the left side.

Eventually, the current pressure pc(n) reaches the repressurization target value PMAX+
When it becomes equal to α, the judgment of ST11 becomes YES,
As shown in FIG. 4f, the display of the repressurization target value on the left side of the display 21 disappears (ST12), and the upward arrow display also disappears. This allows the measurer to know that the pressure has been increased to a predetermined re-pressurization target value. Therefore, pressurization will be stopped at this point.

When the pressurization is stopped, the cuff pressure is gradually reduced by slow evacuation by the evacuation valve 14, and the current pressure on the right side of the display 21 is also reduced. Thereafter, the systolic blood pressure is determined by detecting the K sound (ST13), and the systolic blood pressure is displayed on the left side of the display 21 as shown in FIG. 4g (ST14). At this time, the current pressure is displayed on the right side of the display 21.

In the process of further pressure reduction, disappearance of the K sound is detected, and the cuff pressure at that point is determined as the diastolic blood pressure (ST15), and the diastolic blood pressure is displayed on the right side of the display 21 instead of the current pressure. Displayed (ST16). After that, in ST17, a measurement end process such as displaying a downward arrow exhaust symbol is performed, and the operation ends. Furthermore, if insufficient pressurization is not detected in ST7, the process moves to ST13, and thereafter the processes from ST13 onwards are performed.

In the above embodiment, the measurement process after ST13 uses the K-sound method in which the systolic blood pressure and diastolic blood pressure are determined by detecting the occurrence and extinction of the K-sound. The processing itself may be performed using other methods, such as an oscillation method in which the pulse wave component superimposed on the cuff pressure is separated and the blood pressure is determined from the envelope of its amplitude value. In this case, the K sound sensor, its amplifier, etc. are unnecessary.

In addition, in the above embodiment, the maximum pressure value
The target value is calculated by adding a predetermined value α to PMAX, but this predetermined value α may be switched by an external switch, or the maximum pressurization value
Different values may be selected depending on PMAX.

Furthermore, in the above embodiment, the display 21 is
until the systolic blood pressure is determined or insufficient pressure is detected.
The current pressure is displayed on the right side, and when insufficient pressurization is detected, the re-pressurization target value is displayed on the left side of the display 21 instead of the maximum pressurization value, and when the systolic blood pressure is determined, the left side is displayed. The systolic blood pressure is displayed in the section, but
Two or more displays may be provided, and the maximum pressurization value, target repressurization value, systolic blood pressure, etc. may be displayed on each individual display.

(G) Effects of the Invention According to the present invention, when insufficient pressurization is detected, the re-pressurization target value is displayed, so the next pressurization value can be clearly grasped, so that further insufficient pressurization will not occur. On the contrary, it can prevent excessive pressurization.

Further, in the case where the repressurization target value and the current pressure are displayed side by side, the current pressure can be increased while checking the target value, so that repressurization can be accurately performed up to the target value.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a schematic configuration of the present invention, FIG. 2 is a circuit block diagram of an electronic blood pressure monitor in which the present invention is implemented, and FIG. 3 is a block diagram showing the operation of the electronic blood pressure monitor. Flow diagram, Figure 4 a, b,
c, d, e, f, and g are diagrams showing display examples for explaining the operation of the electronic blood pressure monitor. DESCRIPTION OF SYMBOLS 1... Cuff, 2... Pneumatic system, 3... Measured data detection unit, 4... Blood pressure determination means, 5... Display means, 6... Insufficient pressurization detection means, 7... Re-pressurization target value calculation Means, 8...Repressurization display means.

Claims (1)

[Scope of Claims] 1. A cuff, a pneumatic system that pressurizes and depressurizes the cuff, a measurement data detection unit that detects data for determining blood pressure including cuff pressure in the process of pressurizing and depressurizing the cuff, and An electronic sphygmomanometer including a blood pressure determining means for determining blood pressure based on measurement data and a display means for displaying the determined blood pressure value, comprising: an insufficient pressurization detection means for detecting insufficient pressurization; Repressurization target value calculation means for calculating a repressurization target value in response to detection of insufficient pressurization by the means, and repressurization target value display means for displaying the calculated repressurization target value. Features of electronic blood pressure monitor.