JPH01288231A - Automatic blood pressure measuring instrument - Google Patents

Abstract

PURPOSE:To shorten a time until a pressure in an arm band attains to a pressure vicinity in which a blood pressure can be measured and to execute a speedy blood pressure measurement by providing a pressurizing adjuster to removed the pulse movement of a pressurized air according to the pressure in the arm band. CONSTITUTION:At the time of executing the blood pressure measurement, first, a control part 80 activates a pressurizing pump device 10. Next, an air pressurized from the pressurizing pump device 10 is supplied to the inlet port of a pressurizing adjuster 20A. The inlet port and a discharge port are communicated by a first route to communicate a first pressure room - a valve seat - a groove 22 and a second route to communicate the first pressure room - a first narrow route - a second pressure room - a second narrow route. When the pressure in an arm band 50 is low, the arm band 50 is pressurized in a short time by the first route, and when the pressure in the arm band 50 goes to the pressure sufficient for the blood pressure measurement, the pressurized air, in which the pulse movement is removed, is supplied to the arm band 50 in the second route in delaying a pressurizing speed. Consequently, the time up to the blood pressure measurement can be shortened, and the speedy blood measurement can be executed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention supplies pressurized gas from a pressurizing pump device to the cuff and automatically adjusts the blood pressure of the human body by manipulating the pressure. The present invention relates to an automatic blood pressure measuring device for measuring blood pressure.

[Conventional technology]

In recent years, automatic blood pressure measuring devices that can measure blood pressure at home with simple operations have become popular. This type of device attaches a cuff to the upper arm of the subject to compress the blood vessels, supplies pressurized air from a pressurizing pump device to the cuff, and uses a pressure sensor to monitor the state of the blood vessels at that time. A method is used to detect blood pressure and calculate blood pressure values. As for the procedure for supplying pressurized air to the arm cuff, two methods have been proposed as shown in the characteristic diagrams shown in FIG. In other words, GL in the same figure)
In this case, the pressure in the cuff is increased at once to pressure P1, which is sufficient to measure the "systolic blood pressure" in the upper arm, and then the pressure is gradually lowered to "systolic blood pressure" at pressure P2, and pressure P3.
The ``diastolic blood pressure'' is measured sequentially. When the blood pressure measurement is completed, all the pressurized air remaining in the cuff is exhausted. However, this method does not measure the ``systolic blood pressure'' of the subject.
Even if the blood pressure is, for example, 120 mmHP, as mentioned above, the arm cuff is pressurized at once with sufficient pressure (for example, 200 mm HP) to measure the "systolic blood pressure" of the subject. Regardless of the condition, the upper arm was pressed, causing pain to the person being measured.

For this reason, the method shown in FIG. 12(b) has been proposed.

This method gradually increases the pressure inside the arm, so
Pressure applied to the wristband does not cause pain to the person being measured.

Furthermore, since the pressure is not gradually lowered during blood pressure measurement, this method is superior to the method shown in FIG.

FIG. 13 is a block diagram showing an automatic blood pressure measuring device using the method shown in FIG. 12). In the figure, 10 is a pressurizing pump device consisting of a DC motor 10a and a pressurizing mechanism part 10b that discharges pressurized air according to the rotation of this motor 10a, and 30 is a pressurizing regulator that removes pulsation of the pressurized air. , 40
50 is a cuff attached to the upper arm of the person to be measured to compress the blood vessels when measuring blood pressure; 60 is the pressure of the cuff 50; 70 is a quick release valve that discharges the pressurized air remaining in the cuff 50 after the blood pressure measurement is finished; 80 is a control unit that controls the start-up of the pressurizing pump device 1o and the inside of the cuff 5D. The blood pressure value is calculated based on the signal from the pressure sensor 60 obtained through this adjustment and displayed on the display section 90.

Now, the procedure for measuring blood pressure using this automatic blood pressure measuring device will be explained. First, the control unit 80 starts up the pressurizing pump device 10. Next, the pressurized air from the pressurization pump device 10 is supplied to the pressurization regulator 30. The pressurization regulator 30 is installed to prevent the pulsation of the pressurized air in the pressurization pump device 10 from being mistaken for the pulsation of the blood vessel detected by the pressure sensor 60, and is shown in the block diagram shown in FIG. 14. It has a configuration like this, which eliminates pulsation of pressurized air.

That is, the pressurized air supplied to the pressure regulator 30 repeatedly accumulates pulsating energy in the pressure chambers 30a+30c and restricts the flow rate in the narrow passages 30b and 30d, and then pulsations are removed. The pressurized air from which this pulsation has been removed is then delivered to the cuff 50. And Fig. 12(b)
After the time T1 shown in FIG.
When the pressure P6 is detected, the control unit 80 determines the pressure P6 at this time to be the "diastolic blood pressure." Furthermore, the pressure P5 at time T2 when the pressure of the cuff 50 increases and the blood flow stops is referred to as "systolic blood pressure".
I judge that. When the blood pressure measurement is completed in this way, the quick release valve 70 is opened to discharge all the pressurized air remaining in the cuff 50, and the display section 90 displays "systolic blood pressure" and "diastolic blood pressure".

[Problem to be solved by the invention]

However, in the conventional automatic blood pressure measuring device shown in FIG. 13, the pressurizing pump device 10
A narrow passage 30a provided in the pressure regulator between and the cuff 50.
, 30c. For this reason, the pressurizing device 10
The flow rate of pressurized air from the arm cuff 50 to the arm cuff 50 is restricted, and the arm cuff 50
The disadvantage is that it takes time for the pressure to rise. That is, the time T1 until the "diastolic blood pressure" shown in FIG. 12(b) can be measured becomes longer, which hinders prompt blood pressure measurement.

The present invention has been made in order to eliminate the above-mentioned drawbacks, and when the pressure inside the arm cuff 50 is not sufficient, pressurized air with no flow rate restriction is supplied to the arm cuff 50 from the pressurizing pump device 10.
It is an object of the present invention to provide an automatic blood pressure measuring device that supplies pressurized air without pulsation to a cuff 50 when the pressure inside the cuff 50 reaches around a pressure at which blood pressure can be measured.

[Means to solve the problem]

In order to eliminate the above-mentioned drawbacks, the present invention provides a first valve seat that communicates with an inlet for sucking pressurized air from a pressurizing pump device and an outlet for delivering this pressurized air to the arm cuff through a valve seat. a second passage consisting of a narrow passage with one or more pressure chambers provided in the middle that communicates the inlet and the outlet; and when the pressure in the cuff is low, the first passage; and a valve body that communicates with the valve body through a valve seat and presses against the valve seat to shut off the first passage when the pressure in the cuff increases.

[For production]

The pressure regulator supplies unrestricted pressurized air to the arm cuff from a pressurizing pump device when the pressure inside the cuff is low, and supplies pressurized air without pulsation to the arm cuff when the pressure inside the cuff increases. Supply to the belt.

〔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. 13 are given the same reference numerals. 20A is arm cuff 5
This is a pressure regulator that removes pulsation of pressurized air according to the pressure within 0. FIG. 2 is an assembly diagram of the components of the pressure regulator 20.

In the figure, 20 is a suction side container, 21 is a backing, 2
2 is an intermediate container; 23 is a backing having a valve body 239;
24 is a discharge side container, 25 is a spring, and 26 is a spring adjustment plug. The pressure regulator is composed of these seven main parts, including a bolt 27 and a nut 28 that are inserted into the containers 20 and 24 on both sides of the intermediate container 22.
It is concluded with. At this time, the spring 25 is loosely inserted into the communication port 24j while pushing the backing 23, and the spring 25 is adjustedably pressed by the adjustment plug 26 provided inside the communication port and having an internal thread and an external thread 26m. There is. 20& is an inlet, 21d is a communication port formed with the same diameter as the recess 22d, 22a is a valve seat on the bottom of the recess 22b, and 22c is bent so as to provide a sufficient distance from the recess 22d to the communication port 22f. groove,
23f is a communication port formed with the same diameter as the communication port 22f;
4f is a discharge port, 24h is a recess that communicates with the communication port 24j,
20e, 21e, 23e, and 24e are through holes through which bolts 27 are passed. Note that arrow A indicates the direction in which pressurized air sent from the pressure pump device 10 is sucked, and arrow B indicates the direction in which it is discharged. FIG. 3(a) is a plan view of the intermediate container 22, and FIG. 3(b) is a plan view of the intermediate container 22.
FIG. In the figure, 22h is a concave portion, 22i is a convex portion provided at the bottom of the concave portion 22h to support the gasket 23, and 22j is a communication hole 22f from the concave portion 22h.
The groove part 22 has a recess 22b and a recess 22h.
It is a through hole that communicates with the FIG. 4(a) shows the inhalation container 20.
The plan view of FIG. In the figure, 20b is a recess communicating with the suction port 20a, and 20c is a groove bent to provide a sufficient distance from the recess 20b to the recess 20d. FIG. 5 is a sectional view of the pressure regulator. In the figure,
26b is a communication port 24j into which the spring 25 is loosely inserted.
This is an air hole to bring the pressure to atmospheric pressure. Recess 20b
and the recess 22b are assembled to form a pressure chamber (referred to as a first pressure chamber), and the groove 20c faces the packing 21, so that the recess 22b is connected to the recess 20.
A narrow path is formed up to d (referred to as the first narrow path). Similarly, the concave portion 20d and the concave portion 22d form a υ pressure chamber (referred to as a second pressure chamber), and the groove portion 22c is the gasket 2.
1, the communication hole 22f is connected from the recess 22d to the communication hole 22f.
A narrow path is formed up to (referred to as a second narrow path).

Further, as described above, the spring 25 is adjustable and pressed by the adjustment stopper 26, and the gasket 23 that is pressed by the spring 25 is supported by the convex portion 22i. Therefore, as shown in the block diagram shown in FIG. The passageway, the second pressure chamber, and the second passageway communicate with each other through the second narrow passageway.

Next, the operation will be explained. In the configuration shown in FIG. 1, when measuring blood pressure at the flat top as explained in FIG. 11(b),
The unswitching control section 80 starts up the pressurizing pump device 10 . Next, the pressurized air from the pressure pump group [10 is supplied to the suction port 20a of the pressure regulator 20A. This supplied pressurized air is sent to two passages as shown in the block diagram shown in FIG.

At this time, the pressurized air passes through the first passage, which has lower air resistance than the second passage in which the narrow passage is arranged, and therefore reaches the discharge port 24f without being subject to flow rate restrictions. become. Therefore, it is as if pressurized air is being sent directly from the pressurizing pump device 10 to the cuff 50, and the pressure inside the cuff 50 can be quickly increased.

Now, the pressure P inside the cuff 50 increases and becomes larger than the spring pressure F of the spring 25, that is, F<ps (however,
When S becomes the surface 3i) of the valve body 232, the valve body 232 is pushed up toward the spring 25 side as shown in FIG.
It will be pressed against a. As a result, the first passage is not cut off, and all of the pressurized air supplied to the suction port 201 is sent into the second passage. At this time, the pressurized air accumulates in the first pressure chamber because the flow rate is rapidly restricted. This accumulation causes an accumulation effect of the pulsating energy of the pressurized air, and this pulsating energy is smoothed. Next, the pulsation of the pressurized air sent into the first narrow passage is attenuated by the narrow passage having high air resistance. Then, the pressurized air whose pulsation has been attenuated is sent to the second pressurization chamber. Since the capacity of this pressure chamber is sufficiently larger than that of the first narrow passage, even if there is pulsation that cannot be removed in the first pressure chamber, the pulsation energy will be absorbed again due to the pulsation energy accumulation effect. Smooth. moreover,
When this pressurized air passes through the second narrow passage, the pressurized air from which pulsation has been removed is supplied to the discharge port via the communication port 22f. Therefore, pressurized air with pulsation removed is delivered to the cuff 50.

In this manner, when the pressure inside the arm cuff 50 is low (F>PS) as shown in the characteristic diagram shown in FIG. When the pressure within the band 50 reaches a pressure sufficient for blood pressure measurement (F<PS), the pressurized air from which pulsation has been removed is supplied to the arm cuff 50 through the second passage at a slow pressurization speed. I can do it. Therefore, the conventional time TI until blood pressure measurement can be shortened to time To, and rapid blood pressure measurement becomes possible. Further, by adjusting the spring pressure F of the spring 25 using the spring adjustment plug 26, the setting of the pressure P in the cuff 50 for switching from the first passage to the second passage can be changed to an arbitrary value.

In addition, in the above-mentioned embodiment, the pressurization regulator 20A was described which removes the pulsation of the pressurized air according to the pressure inside the cuff 50, but as shown in the cross-sectional view of FIG. You may. In the figure, the same or equivalent parts as in FIG. 5 are given the same reference numerals. 20 is intake port 20m
a passageway communicating with the pressure chamber formed by the recess 22b;
24L is a groove portion that communicates with the recess 24p and the discharge port 24f; 24m is a discharge port that communicates with the discharge port 24f;
24n is a passage communicating the pressure chamber and the discharge port 24f;
29 is a backing arranged to press the suction port 20a that communicates with the intermediate container 22; 29a is a communication port that communicates the air chamber formed by the recess 22m with the groove 241; 29b
is a spring that presses the backing 29.

When pressurized air is supplied to this suction port 20a from the pressurizing pump device 10, it passes through a passage 221 and is sent to the pressure chamber as shown in the sectional view of FIG. Then, it passes through the passage 24n through the valve seat 22m and is sent to the discharge port 24f (first passage). On the other hand, when the pressure of the pressurized air in the suction port 2011 becomes stronger than the pressure of the spring 29b, the backing 29 is raised to the container 24, and the backing 29 is brought into close contact with the groove 241 to form a narrow passage. Therefore, the pressurized air passes through the air chamber, is sent into the narrow passage through the circulation port 29a, and is then sent out to the discharge port 24f (second passage).
.

At this time, the pressurized air supplied from the inlet 20m passes through the first passage, which has lower air resistance than the second passage where the narrow passage is arranged, so it is mostly subject to flow rate restrictions. It reaches the discharge port 24f first. Therefore, the pressure within the cuff 50 to which pressurized air is sent from the discharge port 24f can be quickly increased.

Next, the pressure P inside the cuff 50 rises and becomes larger than the spring pressure F of the spring 25, and when the condition F < PS is satisfied, the valve body 239 is pressed against the spring 25 as shown in FIG.
It is pushed up to the side and comes into pressure contact with the valve seat 22a. As a result, the first passage is blocked, and all the pressurized air supplied to the suction port 2Qa is sent to the second passage.

At this time, the pressurized air accumulates in the air chamber because the flow rate is rapidly restricted. Along with this accumulation, an accumulation effect of the pulsating energy of the pressurized air occurs, and this pulsating energy is smoothed.

Next, the pressurized air sent into the narrow passage has its pulsations attenuated by the air resistance of the narrow passage and is sent to the discharge port 24f.

Therefore, pressurized air with pulsation removed is delivered to the cuff 50.

Now, after measuring the blood pressure, when the pressurized air supplied to the inlet 20a is stopped, the spring 29b appears as shown in Figure 9.
Shippacking 29 returns due to the suppression of . As a result, the discharge port 24f and the discharge port 24m are in communication with each other.
Since the inside of the discharge port 24f is at atmospheric pressure, the pressurized air remaining in the cuff 50 can be discharged all at once.

As described above, this pressure regulator has a rapid discharge function that immediately returns the pressure inside the cuff 50 to atmospheric pressure, so it cannot be used in place of the pressure regulator 20A shown in Figure 1. It becomes possible to measure blood pressure without using the Sudden 9P70, and significant effects such as simplifying the configuration of the automatic blood pressure measuring device and simplifying control can be expected.

〔Effect of the invention〕

As explained above, the present invention provides a pressure regulator that removes the pulsation of pressurized air according to the pressure inside the cuff, so that the pressure inside the cuff reaches around the pressure at which blood pressure can be measured. It has remarkable effects, such as shortening the time it takes to reach blood pressure and making it possible to quickly measure blood pressure.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, FIG. 2 is an assembled diagram of the pressure regulator 20A, FIG. 3(a) is a plan view of the intermediate container 22, and FIG. a) [[B-■B sectional view,
FIG. 4(a) is a plan view of the inhalation container 20, FIG. 4(b) is a cross-sectional view taken along the line ■B-■B in the same figure (Otori), and FIG. Figure 6 is a block diagram showing the flow of pressurized air in the pressure regulator 20, Figure 7 is a sectional view of the pressure regulator 20A when the pressure inside the cuff 50 increases, and Figure 8 is the pressure adjustment. Characteristic diagrams of the device 20A, Fig. 9, Fig. 10, Fig. 11
The figure is a sectional view showing another embodiment of the pressurization regulator, Fig. 12 is a characteristic diagram of the pressure inside the cuff and time, Fig. 13 is a conventional configuration diagram, and Fig. 14 is a conventional pressurization It is a block diagram showing the flow of air. 10...ψpressure pump device, 10a...DC motor, 10b...pressure mechanism section, 20A...
Pressure regulator, 40...pressure piping, 50 Yu...arm cuff, 60...music/pressure sensor, 70...quick release valve, 80
...control section, 90...display section. Patent issuer Oken Seiko Co., Ltd.

Claims (1)

[Scope of Claims] An automatic blood pressure measuring device that includes a pressurizing pump device that delivers pressurized gas and a cuff that stores the pressurized gas, comprising: an inhalation device that inhales the pressurized gas from the pressurizing pump device; A first passage communicating between the mouth and a discharge port for delivering the pressurized gas to the cuff via a valve seat, and one or more pressure chambers communicating between the suction port and the discharge port. A second passage consisting of a narrow passage provided therein communicates with the first passage through a valve seat when the pressure in the cuff is low, and when the pressure in the cuff increases, the valve seat is brought into pressure contact. an automatic blood pressure measuring device comprising: a pressure regulator having a valve body that shuts off the first passage;