JPH01232931A - Automatic blood pressure measuring apparatus - Google Patents

Abstract

PURPOSE:To accurately measure blood pressure by removing the pulsation of compressed air and eliminating that a pressure sensor mistakes the pulsation of blood for that of compressed air, by providing the narrow passage arranged to the emitting port of a pressurizing mechanism part sufficiently long while providing a pressure controller having one or more pressure chamber on the way of said narrow passage. CONSTITUTION:A control part 80 starts a pressure pump apparatus 10. Next, compressed air is supplied to the suction port 21a of a pressurization controller 20 from the pressure pump apparatus 10 and sent to the first pressure chamber formed of a recessed part 21e. The compressed air sent in the first narrow passage is attenuated in its pulsation by the narrow passage high in air resistance and this compressed air attenuated in its pulsation is sent to the second pressure chamber formed of recessed parts 21b, 23b. Further, the compressed air passes through the second narrow passage having the same structure as the first narrow passage to send the compressed air whose pulsation is almost removed to the third pressure chamber. The third pressure chamber performs the same action as the second pressure chamber and also stabilizes the pressure of the compressed air supplied to a cuff 40.

Description

[Detailed description of the invention] [Industrial application field] The present invention uses a pump device that compresses and pressurizes gas,
The present invention relates to an automatic blood pressure measuring device that automatically measures blood pressure of a human body.

[Conventional technology]

Generally, blood pressure measurements have been performed by medical personnel such as doctors using a mercury column connected to a manual pump and a stethoscope. However, in recent years, with the development of medical technology and the desire to improve the health of the people, there has been a strong desire to measure blood pressure at home, and automatic blood pressure measuring devices that can measure blood pressure with simple operation have become popular.

FIG. 9 is a configuration diagram of a conventional automatic blood pressure measuring device.

In the figure, 10 is a pressurizing pump device consisting of a DC motor 10& and a pressurizing mechanism section 10b that discharges high-pressure air by the rotation of this DC motor, and 30 is this pressurizing pump device 10.
40 is a cuff attached to the upper arm of the subject to compress blood vessels during blood pressure measurement, and 50 is a pressure sensor for detecting the pressure of the cuff 40. ,
Reference numeral 60 denotes a slight discharge valve that gradually discharges the pressurized air accumulated in the cuff 40, and 70 denotes a quick discharge valve that discharges the pressurized air remaining in the cuff 40 all at once after blood pressure measurement is completed. Reference numeral 80 denotes a control unit, which controls the activation of the pressurizing pump device 10 and adjusts the pressure inside the cuff 40, and calculates a blood pressure value based on the signal from the pressure sensor 50 obtained by this adjustment, and displays a display unit. 90.

Now, the first step is to measure blood pressure with this automatic blood pressure measuring device.
This will be explained using the characteristic diagram shown in Figure 0.

First, the arm cuff 40 is attached to the upper arm of the person to be measured, and the arm cuff 40 is pressurized by the pressurizing pump device 10 .

Next, when the arm cuff 40 reaches a pressure sufficient to measure the "systolic blood pressure" of the upper arm after a time Tl (point P), the control unit 80 stops the pressurizing pump device 10. The micro-exhaust valve 60 has the shape of a small hole, and when the pressurizing pump 10 stops, it gradually exhausts pressurized air and releases it from the cuff 40.
Reduce internal pressure. For example, the pressure is 150g
When the pressure sensor 50 detects that blood in the upper arm has started to flow when the pressure is Hg (point H), the control unit 80 determines the pressure at this time to be the "systolic blood pressure". When the pressure in the cuff 40 further decreases and the pressure sensor 50 detects blood pulsation when the pressure is, for example, 90 smHg (lit), the control unit 80 determines the pressure at this time to be the "diastolic blood pressure". In this way, when the blood pressure measurement is completed, the sudden exhaust valve TO is opened to exhaust all the pressurized air remaining in the cuff 40 (point C), and the display section 9
0 displays "systolic blood pressure 150J" and "diastolic blood pressure 90".

This procedure for measuring blood pressure follows the same procedure as described above by doctors using a manual pump and stethoscope, and there is no problem in principle, but the conventional procedure first measures the ``systolic blood pressure.'' As shown in FIG. 10, the initial pressure of the cuff 40 had to be increased to 250 atmHf 1 in a short time, which resulted in an increase in the power consumption of the pressurizing pump device. In addition, the fine discharge valve 60 is not required.
The configuration was complicated.

For this reason, an improved procedure as shown in the characteristic diagram shown in FIG. 11 has been proposed. That is, the pressure on the cuff 40 is gradually increased, and contrary to the above, the point at which the blood pulsation stops (point L) is determined to be the "diastolic blood pressure", and the pressure on the cuff 40 is further increased to increase the blood pressure. When the flow rises (point H), it is determined to be the "systolic blood pressure."

After measuring the "systolic blood pressure" of the subject, the emergency vent valve is opened to discharge the pressurized air from the cuff 4o (point C). With this procedure, there is no step for gradually discharging the pressurized air, so there is no need for the micro-exhaust valve 60, and there is no need to increase the initial pressure of the arm cuff 40 to 2501 Hg in a short time. , is superior to the previously described procedure in this respect.

[Line layer that the invention attempts to solve]

However, in the procedure explained in FIG. 11, the "diastolic blood pressure" (dot) and "systolic blood pressure" (point H) are measured while the pressurizing pump device 10 is pressurizing the cuff 40. There is a possibility that the pressure sensor 50 for measuring the blood pressure value may misidentify the pulsation of the blood and the pulsation of the pressurized air by the pressurizing pump device 10, and accurate blood pressure measurement could not be expected.

[Means to solve the problem]

In order to solve the above-mentioned problem, the present invention includes a pressure regulator having a sufficiently long narrow passage communicating with the discharge port of the pressurizing mechanism and one or more pressure chambers in the middle of this narrow passage. .

[Effect]

The pulsation of pressurized air that occurs when pressurizing with the pressurizing pump device is eliminated by the pressurizing regulator.

〔Example〕

Examples will be described below. FIG. 1 is a configuration diagram showing an embodiment according to the present invention. In the figure, the same parts as in FIG. 9 are given the same reference numerals.

20 is a pressure regulator that eliminates pulsation of pressurized air. FIG. 2 shows an external view of the pressure regulator 20.
) is a front view thereof, and (b) is a side view thereof.

In the figure, 21 is a suction side container, 22 is a backing,
23 is a discharge side container having the same structure as the suction side container 21.

Pressure yI cosmetic surgery 0 is composed of these three main parts.
23 is fastened with a bolt 24 and a nut 25 so as to sandwich this.

Further, arrow A indicates the direction in which air is inhaled from the pressurizing pump device 10, and arrow B indicates the direction in which air is discharged. FIG. 3 is an assembled diagram of the components of the pressure regulator 20. In the figure, 21a is an inlet, 21b is a recess, 2
1e is a groove, 22b is a communication port of the backing 22 formed with the same diameter as the recess 21b, 21d, 22d, and 23d are through holes for passing the bolt 24, and 21e is a recess connected to the suction port 21a.

In addition, as mentioned above, the suction side container 21 and the discharge side container 23
Since they have the same structure, there is a discharge port 23a in the discharge side container 23, although it is not shown in FIG.

A recess 23e is formed which is connected to the recess 23b1, the groove 23C1, and the discharge port 23a. 4(-) is a plan view of the suction side container 21 seen from symbol C in FIG. 3, and FIG. 4(b) is a sectional view taken along IVB-IVB in FIG. 3(a). In the same figure (&), the groove part 21c is bent and arranged so that a sufficient distance can be obtained from the recess part 21e to the recess part 21b.

Further, as shown in FIG.
has a large cross section (volume). Figure 5 is the second
It is a v-■ sectional view of figure (a). In the figure, the groove 21e in the suction side container 21 faces the backing 22, thereby forming a narrow path from the recess 21θ to the recess 21b (referred to as a first narrow path). In addition, the recess 21 also faces the backing 22 to form a pressure chamber.
The recess 21b is connected to the recess 23b via the communication port 22b to form a pressure chamber having two volumes, the recess 21b and the recess 23b (referred to as a second pressure chamber). Furthermore, the groove 23c in the discharge side container 23 also forms a narrow passage from the recess 23b to the recess 23@i (referred to as a second narrow passage), and the recess 236 also forms a pressure chamber (the third pressure (called a room).

Next, the operation will be explained. In the configuration shown in FIG. 1, when blood pressure is measured using the procedure described in FIG. 11, the control section 80 first starts the pressurizing pump device 10. Next, the air pressurized from the pressurizing pump device 10 is transferred to a pressurizing regulator 20.
is supplied to the inlet Zta of the inlet. This supplied pressurized air is sent to a first pressure chamber formed by a recess 21, as shown in the block diagram shown in FIG. This first pressure chamber stores the supplied pressurized air to prevent the flow rate from decreasing when the pressurized air passes through the next first narrow passage.

Furthermore, when pressurized air is accumulated, an accumulation effect of pulsating energy is produced, and the pulsating energy is smoothed out. Next, the pulsation of the pressurized air sent into the first narrow passage is attenuated by the narrow passage with high air resistance. And the B
The pressurized air whose IC motion has been attenuated is sent to the second pressurizing chamber formed by the recesses 21b and 23b. The capacity of this pressure chamber is sufficiently larger than that of the first narrow passage, so even if there is pulsation in the pumped pressurized air that cannot be removed in the first pressure chamber, the pulsating energy will be absorbed. Due to the accumulation effect, the pulsating energy is smoothed again. Furthermore, by passing the pressurized air through the narrow passage tlc2 having the same structure as the first narrow passage, the pressurized air from which pulsation has been removed is sent to the third pressure chamber. The third pressure chamber performs the same function as the second pressure chamber and stabilizes the pressure of the pressurized air supplied to the arm cuff 40.

In this way, the pressurization regulator 20 completely eliminates the pulsation of the pressurized air supplied from the pressurization pump device (1).

Note that the basic principle of this action is similar to the -I fuller in automobiles and the like.

Therefore, pressurized air with pulsation removed is supplied to the pressure sensor 50 and other parts, so when measuring the "diastolic blood pressure" (dot) and "systolic blood pressure" (point H) explained in FIG. The pressure sensor 50 can accurately measure blood pressure without misidentifying blood pulsation and pressurized air pulsation.

Furthermore, by connecting the pressurization regulator 20 to the pressurization pump device 10, constant flow characteristics as shown in the characteristic diagram shown in FIG. 7 can be expected. That is, as mentioned above, the pressure regulator 2
0 is composed of two narrow passages and a pressure chamber, so air resistance is high and even if the voltage of the pressurizing pump device 10 is increased to increase the pressure, the pressurized air passing through the pressurizing regulator 20 is limited to a certain amount. For example, characteristic a of the pressurizing pump device 10 when the pressurizing regulator 20 is not attached is that as the pump voltage increases, the flow rate also increases linearly. On the other hand,
Characteristics (c) and (d) when the pressure regulator 20 is installed are such that as soon as the pump voltage increases, the first pressure chamber rises to the maximum pressure of the pressure pump device 1G, and as a result, the flow rate of characteristic a is 1, each flow rate is 2'3'5. This means that a substantially constant flow rate can be obtained even if the working voltage value varies within the working voltage range, and this characteristic allows stable blood pressure measurement. Furthermore, by changing the shape of the narrow passage and the volume of the pressure chamber, it is possible to select from c and d, which characterize the desired flow rate required for blood pressure measurement, and flexibility in design can be ensured.

In the above-mentioned embodiment, the pressurizing pump device 10 and the pressurizing regulator 20 are shown as separate bodies, but they may be integrated into an integrated structure as shown in the broken cross-sectional view of FIG. In the figure, the same or equivalent parts as in FIG. 3 are given the same reference numerals. Reference numeral 10e indicates an electric wire for the DC motor, and reference numeral 26 indicates a backing for preventing air leakage when pressurized air is supplied from the pressurizing mechanism section 10b to the suction side container 21.

〔Effect of the invention〕

As explained above, the present invention provides a narrow passage provided long enough at the discharge port of the pressurizing mechanism, and a pressurization regulator having one or more pressure chambers in the middle of the narrow passage. It is possible to remove the pulsation of pressurized air, and when used in an automatic blood pressure measurement device, the pressure sensor will not misidentify the pulsation of blood and the pulsation of pressurized air, allowing accurate blood pressure measurement. . Further, since a constant flow rate characteristic is obtained within the operating voltage range of the pressurizing pump device, a stable blood pressure value can be measured even if the pump voltage fluctuates during blood pressure measurement.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing an embodiment of the present invention used in an automatic blood pressure measuring device, Fig. 2 (-) is a front view of the pressure regulator, Fig. 3 (b) is a side view thereof, and Fig. 3 4(-) is a plan view of the suction side container 21 seen from symbol C in FIG. 3, and FIG.
fB-IVB sectional view, Fig. 5 is a V-V sectional view of Fig. 2 (&), Fig. 6 is a block diagram showing the flow of pressurized air, Fig. 7
The figure is a characteristic diagram of flow rate and pump voltage, Figure 8 is a partial sectional view of a pressure pump device, Figure 9 is a block diagram of a conventional pressure pump device used in an automatic blood pressure measuring device, and Figure 10 is a conventional pressure pump device. FIG. 11 is a proposed pressure-time characteristic diagram. 10. Fist: Pressure pump device, 10a: DC motor, 10b: Pressure mechanism section, 20: Pressure adjustment section, 30: Pressure piping, 40... Own arm cuff A s
o-・0 pressure sensor, TO・-0・sudden discharge valve, 80・・
...control section, 90...display section.

Claims (1)

[Scope of Claims] A pressurizing pump device comprising a motor and a pressurizing mechanism that discharges high-pressure gas by rotation of the motor, a sufficiently long narrow passage communicating with a discharge port of the pressurizing mechanism, and this narrow passage. 1 in the middle of
It is equipped with a pressure regulator having three or more pressurization chambers, and a cuff that accumulates the pressurized air sent from this pressure regulator. An automatic blood pressure measuring device characterized by low blood pressure, eliminating pulsation, and having constant flow characteristics with respect to pump voltage.