JPS632015Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field of the Invention> The present invention relates to an electronic blood pressure monitor that electrically detects systolic blood pressure values and diastolic blood pressure values and digitally displays them on a blood pressure display.

<Background of the invention> Conventionally, this type of blood pressure monitor uses a semiconductor pressure sensor to measure the pressure of the pressurization system. By the way, the output of this pressure sensor includes the atmospheric pressure applied to the pressure sensor, so it is necessary to subtract this atmospheric pressure to obtain the true pressure. For this reason, zero point correction of the pressure is required, and normally, before blood pressure measurement, the atmospheric pressure applied to the pressure sensor is checked in advance by opening the exhaust valve of the pressurizing system and venting the pressurizing system to the atmosphere. ing. However, the person taking the measurement sometimes forgets to open this exhaust valve, and as a result, the pressurized system is not released to the atmosphere, and residual pressure is generated within the cuff, causing its internal pressure to exceed atmospheric pressure. . In a state where this residual pressure exists, it is impossible to perform an appropriate zero point correction of the pressure, and it is difficult to expect accurate blood pressure measurement. Therefore, it is possible to provide a solenoid valve in the pressurization system and forcibly exhaust the pressurization system at the same time as the power is turned on, but this method has disadvantages such as an increase in the cost of the blood pressure monitor.

<Purpose of the invention> The purpose of the invention is to provide a new electronic blood pressure monitor that can be expected to always measure blood pressure accurately by instructing the measurer to exhaust air from the pressurization system prior to blood pressure measurement. shall be.

<Structure and effect of the invention> In order to achieve the above object, the present invention focuses on the fact that the exhaust valve in the pressurized system is structured to naturally exhaust a small amount under pressurized conditions, and uses it as a blood pressure indicator. In addition to providing an exhaust instruction section that instructs the exhaust of the pressurized system, the control means consisting of a microcomputer or the like calculates the amount of change over time in the output of the pressure sensor prior to blood pressure measurement, and if the calculated value exceeds a predetermined reference value. The exhaust instruction section is configured to operate at the same time.

According to the present invention, if residual pressure is generated in the pressurized system due to forgetting to open the exhaust valve, the pressure in the pressurized system will gradually drop due to the natural exhaust of the exhaust valve, so this pressure can be reduced. By checking the amount of change over time, it can be determined whether there is residual pressure in the pressurizing system, and based on this result, the operator can be instructed to perform the evacuation operation.
Therefore, the measurer can reliably open the exhaust valve or perform natural exhaustion over time, making it possible to always expect accurate blood pressure measurement. Furthermore, the method of the present invention has excellent practical effects, such as being able to be implemented at a lower cost than a method of automatically forcing exhaust using a solenoid valve or the like.

<Description of Embodiments> FIG. 1 shows an example of the configuration of an electronic blood pressure monitor, and the illustrated pressurizing system 1 includes a pressurizing rubber bulb 13 that is connected to a cuff 11 made of a rubber tube through an exhaust valve 12. It is composed of An exhaust hole is provided inside the exhaust valve 12 to naturally exhaust the inside of the pressurizing system 1 in small amounts, and when blood pressure is measured, the pressurizing system 1 is
The pressure inside is gradually reduced.

The pressure in the pressurizing system 1 is detected by a semiconductor pressure sensor 2, and the output of the pressure sensor 2 is sent via an A/D converter 21 to a control means 4 consisting of a microcomputer. The pressurization system 1 is also equipped with a Korotkoff sound sensor 3 for detecting Korotkoff sounds, and the blood pressure signal output from the sensor is sent to an amplifier 31.
After being amplified at , the signal is input to the control means 4 . The control means 4 is a central processing unit (hereinafter simply referred to as "CPU").
), memory consisting of RAM and ROM,
It is composed of I/O ports, etc., and each sensor 2,
In response to each output of 3, the systolic blood pressure value and the diastolic blood pressure value are calculated, and the operation of the blood pressure display 5 and the buzzer 6 is controlled.

FIG. 2 shows the configuration of the blood pressure display device 5, which includes blood pressure display devices 51 and 52 that digitally display systolic blood pressure values and diastolic blood pressure values, and a pressurization system 1 that
and an arrow-shaped exhaust instruction section 53 for instructing the measuring person to exhaust the air.

FIG. 3 shows the control operation of the control means 4. When the power is turned on at the "start" point, using this as a trigger signal, the CPU goes to step 70.
In addition to initializing the RAM, I/O ports, etc., the previous pressure data P ₁ and P ₂ stored in the RAM is cleared in step 71. These pressure data P ₁ and P ₂ are data for checking the pressure state of the pressurizing system 1 at the time of starting blood pressure measurement, and in the next step 72 new pressure data P ₁ detected by the pressure sensor 2 is used. is the control means 4
be taken into. At the same time, a timer included in the CPU is set, and when the set time (for example, 2 seconds) has elapsed, the determination of "Time up" in step 74 becomes "YES", and in the next step 75, the pressure sensor 2 is activated once again in the pressurizing system 1. pressure is detected, and pressure data _P2 is taken into the control means 4. Then, in step 76, the CPU calculates the pressure difference A between the pressure data _P1 and _P2 , and in the next step 77, compares the pressure difference A with the reference value B. This step 77 is for checking how much the pressurizing system 1 is evacuated, that is, how much residual pressure there is at the start of blood pressure measurement. Set to a certain degree.

Thus, if the determination of "A>B" in step 77 is "YES", this indicates that the pressurizing system 1 is under a pressurized state and that a considerable pressure change is occurring due to natural exhaust from the exhaust valve 12. . In this case, it is determined that there is residual pressure, and in the next step 78, the exhaust instruction section 5
The display unit 53 lights up, prompting the measurer to perform forced exhaust by opening the exhaust valve 12 or sufficient natural exhaust over time, and in step 79, the second pressure data _P2 is changed to the first pressure. Replaced with data P ₁ . Then, the process returns to step 73, and after the pressure data _P2 is newly read in the processes starting from step 73, similar processes such as calculation of the pressure difference A and comparison with the reference value B are executed. During this time, when the measuring person opens the exhaust valve 12 to remove residual air in the pressurizing system 1 and the pressure difference A becomes less than the reference value B, the determination of "A>B" in step 77 is made. It becomes “ON”. In this state, the pressurizing system 1 has been sufficiently exhausted and the pressure change has become small, and as a result, in the next step 80, the final pressure data P ₂
Let P ₀ be the atmospheric pressure component applied to the pressure sensor 2, that is, the zero point correction value.

Thus, the blood pressure measurement operation begins in step 81 and the pressure data P _x read in step 81 is entered.
In the next step 82, the atmospheric pressure P ₀ is subtracted to determine the true pressure value P. The systolic blood pressure value or the diastolic blood pressure value is determined by inputting the blood pressure signal, and each blood pressure value is digitally displayed on the blood pressure display sections 51 and 52 of the display 5 in step 83, so that the determination in step 84 is "YES". ”
Thus, the blood pressure measurement operation is completed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a configuration example of an electronic blood pressure monitor, FIG. 2 is a front view of a blood pressure display, and FIG. 3 is a flowchart showing the operation of the electronic blood pressure monitor according to the present invention. DESCRIPTION OF SYMBOLS 1... Pressurization system, 2... Pressure sensor, 4... Control means, 5... Blood pressure display, 53... Exhaust instruction part.

Claims (1)

[Scope of Claim for Utility Model Registration] An electronic sphygmomanometer that detects the pressure of a pressurization system against an arm cuff using a pressure sensor and calculates a blood pressure value based on the detected value, wherein the exhaust of the pressurization system is provided to the measuring person. a blood pressure display equipped with an exhaust instruction section for instructing the blood pressure to be evacuated; An electronic blood pressure monitor comprising: a control means for operating a blood pressure monitor; The electronic blood pressure monitor according to claim 1, wherein the pressure sensor is a semiconductor pressure sensor. The exhaust instruction section is configured to cause a predetermined mark to light up.
Electronic blood pressure monitor described in section. The electronic blood pressure monitor according to claim 1, wherein the control means is a microcomputer.