JPH06117B2 - Electronic blood pressure monitor for fingers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an air pressure electronic device for a finger for measuring blood pressure by applying pressure to a finger and changing the volume of a blood vessel due to the pressure. Regarding blood pressure monitor.

(B) Conventional Technology Conventionally, a so-called finger sphygmomanometer, which measures a blood pressure by pressing a finger, uses a pressure control device such as a roller pump and uses a liquid (water) to press the finger. . However, since this blood pressure monitor has a structure in which the cuff itself filled with water is exposed, there is a defect that the cuff is torn due to continued use.

Therefore, in recent years, an electronic blood pressure monitor for fingers has been proposed that uses a pneumatic cuff (rubber air bag) similar to an arm band blood pressure monitor. This air pressurization type blood pressure monitor for fingers is composed of a finger compression part, a body for mounting a pump for pressurizing the compression part and an electronic circuit for measuring blood pressure.

The finger pressing portion is one in which a cuff is provided inside a case body having a finger insertion opening at one end, and the cuff is formed into a cylindrical shape having an inner hole corresponding to a finger thickness. This is a structure in which the holes are arranged in accordance with the opening position of the case.

For measurement, after inserting the index finger into the cuff inner hole from the case opening, pressurize and bulge the cuff with a pressure pump, press the finger located there, and photoelectrically measure the vascular volume that changes with the pressure. It is intended to measure blood pressure.

(C) Problems to be Solved by the Invention The cuff used in the finger sphygmomanometer is a rubber band-shaped bag body having an air chamber inside, and both ends thereof are curved inward to form a cylinder. The inner hole diameter is set to be approximately the thickness of the index finger.

Therefore, this inner pore size is constant in the normal state.

However, the thickness of the finger inserted into this inner hole varies depending on the person to be measured. Therefore, depending on the person to be measured, the inner hole of the cuff is too small, and it is difficult to insert and remove the finger. Further, in this case, there is a defect that the cuff is deformed or damaged when the finger is forcibly inserted or removed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electronic blood pressure monitor for a finger that solves the above-mentioned problems of the conventional one and can cope with the size of the finger with a single cuff.

(D) Means for Solving the Problems To achieve this object, the electronic blood pressure monitor for a finger of the present invention has a cuff for pressing a finger to be inserted, and a pressurization for supplying air pressure to the cuff. And a cuff pressure sensor for detecting the pressure of the cuff, a pulse wave information detecting means for detecting pulse wave information in the process of changing the cuff pressure, and a cuff. In a blood pressure determining means for determining a blood pressure value by a cuff pressure and pulse wave information obtained from a pressure sensor and pulse wave information detecting means, the pneumatic system sucks normal air in the cuff, and Negative pressure means for increasing the diameter of the finger insertion hole is provided.

(E) Function In the electronic blood pressure monitor for a finger having such a configuration, when the subject's finger is thick and it is difficult to insert the finger into the normal cuff inner hole, the negative pressure means is operated to apply a negative pressure to the cuff air chamber. Pressure is applied and the rubber film is sucked to expand the inner hole diameter. This allows
A single cuff can be versatile.

(F) Embodiment The drawings show a specific embodiment of the electronic blood pressure monitor for a finger according to the present invention.

The electronic blood pressure monitor for the finger has a cuff housing case 4 for housing the cuff 41.
And a main body 1 having a pump for applying and depressurizing the cuff of this case and an electronic circuit unit for measuring blood pressure.

In the cuff housing case 4, a cylindrical cuff 41 having an inner hole corresponding to the finger thickness is arranged in the case body having an opening for inserting a finger at one end so as to be aligned with the opening. Has
It has a support base 43 for supporting the fingertips. Then, a pulse wave sensor 4 including a light receiving / light emitting element is provided at an appropriate position of the cuff 41.
2 is attached.

The internal mechanism of the body 1 is shown in FIG. Cuff
The pulse wave signal detected by the pulse wave sensor 42 of 41 is taken into the MPU (microprocessor unit) 13 via the amplifier 11 and the A / D converter 12. The cuff 41 is a pressure sensor.
14 and the slow exhaust valve 16 and the quick exhaust valve 15 are equivalently communicated with each other, while the pressurizing pump 17 (including the motor) is a check valve.
It communicates with this cuff 41 via 18.

Further, the cuff 41 communicates with the decompression pump (including the motor) 3 via the check valve 18 like the pressurizing pump.

The backflow prevention valve 18 is switched by the start switch 22, is connected to the pressurizing pump 17, and makes the gas flow path one-way in the cuff direction. On the contrary, it is a directional control valve which is switched to the decompression pump 3 by the negative pressure switch 31 and which allows the gas passage to be one-way to the pump side.

The cuff pressure detected by the pressure sensor 14 is amplified by the amplifier 19, passed through the A / D converter 12, and taken into the MPU 13.

This MPU 13 has a built-in memory for storing programs and calculated values, and also has a function of taking in pulse wave data and cuff pressure data by switching the A / D converter 12, turning on / off the pressurizing pump 17 and the depressurizing pump 3. It also has a function and a function of determining blood pressure from pulse wave data and cuff pressure data.

Then, the determined blood pressure values (maximum blood pressure / SYS and minimum blood pressure / DIA) are output from the MPU 13 and displayed on the display 20. Further, the notification sound is output from the buzzer 21 in response to a command from the MPU.

In the embodiment, the pressurizing pump 17 and the depressurizing pump 3 are shown as separate bodies, but the present invention is not limited to this, and a pump for both pressurizing and depressurizing is used (with a forward / reverse rotation motor). Of course, a single pump may be used to switch between pressurization and depressurization.

FIG. 4 shows a control flow of this electronic blood pressure monitor for fingers.

At the time of measurement, the measurer presses the power switch 23. In step ST (hereinafter referred to as ST) 2, it is determined whether or not the negative pressure switch has been pressed. If the person to be measured has a thick finger and is difficult to insert into the cuff inner hole, the negative pressure switch 31 is pressed. As a result, the decompression pump 3 is actuated, a negative pressure is applied to the air chamber of the cuff 41, the normal air capacity of the air chamber is reduced, and the cuff rubber film is sucked. As a result, the inner hole is enlarged (ST3) and the finger is lifted. Can be easily inserted. If the finger of the person to be measured has a standard thickness, it is not necessary to press the negative pressure switch 31, and the start switch 22 is immediately pressed after inserting the finger.

As a result, the determination in ST4 is YES, and the pressurizing pump
17 is activated and the cuff 41 is inflated to a set value (for example, a value that is about 30 mmHg higher than the systolic blood pressure value of the measurement subject) (ST
5).

When the pressure reaches the set value, the pressure pump 17 is turned off.
Then, the low speed exhaust valve 16 starts the low speed exhaust (ST
6). This slow-speed exhaust is previously set to the most suitable exhaust speed (for example, 2 to 3 mmHg / sec) by the exhaust valve.

After that, the pulse wave information and the cuff pressure information are stored in the memory (ST7), and a predetermined algorithm is applied by the MPU 13,
The blood pressure value is calculated (ST8). Then, after the systolic blood pressure value and the diastolic blood pressure value are displayed on the display unit 20 (ST9),
The air in the cuff 41 is exhausted by the quick exhaust valve 15, and the cuff air chamber returns to the normal state. Here, the decompression pump is activated again, and a negative pressure is applied to the air chamber of the cuff 41 to expand the hole diameter (ST10). This allows the finger to be pulled out easily.

(G) Effect of the Invention According to the present invention, as described above, the negative pressure means is provided in the pneumatic system to apply a negative pressure to the cuff, and the rubber film of the cuff is sucked to reduce the cuff air chamber from the normal state.

According to the present invention, when the finger thickness of the person to be measured is thicker than the standard, by operating the negative pressure means, the diameter of the cuff inner hole is expanded and the finger can be smoothly inserted and removed. Therefore,
In the present invention, since the cuff has versatility, it is not necessary to separately prepare various types of cuffs having different sizes, and the cuff may be deformed or damaged by inserting a finger as in the conventional case. It has an excellent effect of achieving the purpose of discovery, such as no.

[Brief description of drawings]

FIG. 1 is a block circuit diagram of the electronic blood pressure monitor for a finger, and FIG.
FIG. 3 is a perspective view showing an electronic blood pressure monitor for a finger, FIG. 3 is a cross-sectional view showing a state in which a negative pressure is applied to a cuff to expand an inner hole diameter, and FIG. It is a flow figure for explaining. 3: Decompression pump, 13: MPU, 14: Cuff pressure sensor, 15: Rapid exhaust valve, 16: Fine speed exhaust valve, 17: Pressurizing pump, 41: Cuff, 42: Pulse wave sensor.

Claims (1)

[Claims] 1. A cuff for pressing a finger to be inserted, a pneumatic system including a pressurizing means for supplying air pressure to the cuff and an exhausting means for exhausting air from the cuff, and a cuff for detecting the pressure of the cuff. A blood pressure value is determined by a pressure sensor, pulse wave information detection means for detecting pulse wave information in the process of changing the cuff pressure, and cuff pressure and pulse wave information obtained from the cuff pressure sensor and pulse wave information detection means. The electronic blood pressure monitor for a finger according to claim 1, wherein the pneumatic system is provided with negative pressure means for sucking normal air in the cuff to expand a finger insertion hole diameter of the cuff.