JPS63317131A - Electronic hemomanometer - Google Patents

Abstract

PURPOSE:To dispense with the discrimination between the noise component from a pressurizing means and the pulse pressure signal from a pulse pressure sensor to easily and accurately measure a blood pressure value, by stopping the operation of the pressurizing means when the blood pressure value is measured. CONSTITUTION:A control means 10 intermittently outputs a pressurizing signal to a pressure pump 4. The pressurizing pump 4 alternately repeats pressurizing operation and the stoppage thereof to raise the cuff pressure of a cuff 2 stepwise. The control means 10 processes the pulse pressure signal from a pulse pressure sensor 8 at the time when the output of the pressurizing signal is stopped to determine the min. blood pressure value and the max. blood pressure value and these values are displayed on a display apparatus 14. After the determination of the blood pressure values is finished, the control means 10 operates a rapid exhaust valve 6 to rapidly discharge cuff pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention provides a cuff for compressing an artery of a subject, a pressurizing means for pressurizing the cuff, and a pressurizing means for pressurizing the cuff by operating in response to a rapid evacuation signal. A rapid evacuation means for rapid evacuation, a pulse pressure sensor that detects the pulse pressure of the artery transmitted to the cuff and outputs the detection output 2 as a pulse pressure signal, and output control of the pressurization signal and the rapid evacuation signal. The present invention relates to an electronic blood pressure monitor comprising a control means for controlling processing of a pulse pressure signal from the pulse pressure sensor.

(Prior Art) In a conventional electronic blood pressure monitor of this type, for example, an oscillometric type electronic blood pressure monitor, as shown in FIG. Then, the cuff pressure is temporarily increased to a set pressurization value higher than the systolic blood pressure value, which is usually about +30 to +60 +nHg. After the pressurization, the inside of the cuff is gradually evacuated using the micro-exhaust valve, and the arterial pulse pressure signal obtained from the pulse pressure sensor is detected and analyzed by the control means to measure the systolic blood pressure value and the diastolic blood pressure value. However, after the measurement was completed, the inside of the cuff was rapidly evacuated.

However, in this type of blood pressure measurement, the cuff pressure is first increased to a pressure higher than the systolic blood pressure value, so it is necessary to set the target pressure value externally, and there is a risk that the set pressure value may not be appropriate. If it is too low, the systolic blood pressure value cannot be determined, and conversely, if it is unnecessarily high, the subject's pain increases and congestion occurs, making it impossible to measure blood pressure correctly.

In order to solve the above problems, a method has been proposed in which blood pressure is measured by detecting the pulse wave during the process of increasing the pressure of the cuff.

That is, the microexhaust valve is used to detect pulse waves and measure blood pressure while increasing the cuff pressure using the pressure pump at the same rate as decreasing the cuff pressure. However, in such blood pressure measurement, if the noise generated due to the mechanical operation of the pressurizing pump is input as an electrical noise component to the control means together with the pulse pressure signal, the control means will be able to detect the noise component. This makes accurate blood pressure measurement impossible.

In order to prevent this and perform accurate blood pressure measurement, it would be good to electrically distinguish the noise component from the pulse pressure signal, but such discrimination is not always easy, especially when using home electronics. In the case of blood pressure monitors, it has been difficult to use expensive discrimination means due to the need to reduce costs.

(Object of the invention) The present invention has been made in view of the above problems, and includes:
By stopping the operation of the pressurizing means when measuring the blood pressure value, it becomes unnecessary to discriminate between the noise component from the pressurizing means and the pulse pressure signal from the pulse pressure sensor, making it easy and accurate without using expensive discrimination means. The purpose is to make it possible to measure blood pressure values.

(Structure of the Invention) In order to achieve such an object, the present invention provides a cuff for compressing an artery of a subject, and a cuff for compressing an artery of a subject, and a cuff for increasing the pressure value applied to the cuff every time a pressurization signal is applied. a pressurizing means for pressurizing the cuff; a rapid evacuation means for rapidly evacuation of the inside of the cuff in response to a rapid evacuation signal; detecting the arterial pulse pressure transmitted to the cuff; a pulse pressure sensor that outputs a pulse pressure signal, and a control means that controls the output of the pressurization signal and the rapid exhaust signal, and controls the processing of the pulse pressure signal from the pulse pressure sensor; pressurization signal output means for intermittently outputting the pressurization signal to the pressure means; and processing the pulse pressure signal from the pulse pressure sensor when the output of the pressurization signal from the pressurization signal output means is stopped. a blood pressure value determining means for determining a diastolic blood pressure value and a systolic blood pressure value; and a blood pressure value determining means operating in response to a blood pressure value determination completion signal from the blood pressure value determining means to output the rapid evacuation signal to the rapid evacuation means. It is characterized by comprising a rapid exhaust signal output means.

In this configuration, the pressurizing means increases the pressurizing pressure value for the cuff each time a pressurizing signal is applied.

The pressurization signal output means of the control means intermittently outputs a pressurization signal to the pressurization means. Therefore, by alternately repeating the pressurizing operation and stopping the pressurizing operation, the pressurizing means can increase the cuff pressure in a stepwise manner by alternately repeating the cuff pressure increase and cuff pressure increase stop.

The blood pressure value determination means of the control means processes the pulse pressure signal from the pulse pressure sensor when the output of the pressurization signal from the pressurization signal output means is stopped, and determines the diastolic blood pressure value and the systolic blood pressure value, After the blood pressure value determination is completed, the rapid evacuation means rapidly evacuates the cuff pressure in response to a blood pressure value determination completion signal given from the blood pressure value determination means.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. FIG. 1 is a circuit diagram of an electronic blood pressure monitor according to an embodiment of the present invention, and FIG. 2 is a circuit diagram of the control means of FIG. 1. In these figures, numeral 2 is a cuff for compressing the artery of the subject, and 4 is a pressurizing means that increases the pressurizing pressure value for the cuff 2 every time a pressurizing signal is applied to pressurize the cuff 2. a pressurizing pump; 6 a rapid exhaust valve as a rapid exhaust means for rapidly exhausting the inside of the cuff 2 in response to a rapid exhaust signal;
8 is a pulse pressure sensor that detects the pulse pressure of the artery transmitted to the cuff 2 and outputs the detection output as a pulse pressure signal;
10 is output control of the pressurization signal and rapid exhaust signal;
A microcomputer that processes and controls the pulse pressure signal from the pulse pressure sensor 8.

It is a control means composed of two parts. This microcomputer is usually composed of a CPU, RAM, and ROM. The CPU processes and controls data according to the program for the entire operation, the RAM stores various data, and the ROM
stores a program for the operating procedure of the CPU. The microcomputer in this embodiment operates by software, but in this embodiment, the configuration of the microcomputer is shown as a hardware configuration as shown in FIG.

Reference numeral 12 designates an operation switch that is operated to measure the blood pressure value and outputs an operation signal to the control means 10, and reference numeral 14 represents a display device that operates in response to a blood pressure value display signal from the control means 10 and displays the blood pressure value. . In addition,! Reference numeral 6 denotes an air pipe that communicates and connects the cuff 2, the pressurizing pump 4, and the rapid exhaust valve 6.

Next, the configuration of the control means 10 will be explained with reference to FIG. 2. In FIG. 2, reference numeral 18 indicates a pressurizing signal output means for intermittently outputting a pressurizing signal to the pressurizing pump 4, and 20 detects the stoppage of the output of the pressurizing signal from the pressurizing signal outputting means 18; Blood pressure value determination means 22 analyzes and processes the pulse pressure signal from the pulse pressure sensor 8 when the output is stopped to determine the diastolic blood pressure value and the systolic blood pressure value; 22 responds to a blood pressure value determination end signal from the blood pressure value determination means 20; A rapid exhaust signal output means operates to output a rapid exhaust signal to the rapid exhaust valve 6, and a pulse pressure signal detection means 23 detects a pulse pressure signal and outputs the detected pulse pressure signal to the blood pressure value determination means 20. The means 24 is a timer which starts a timer operation in response to the pressurization signal given from the pressurization signal output means 18 and outputs a time-up signal to the pulse pressure signal detection means 23 when time-up occurs.

Next, the operation of the electronic sphygmomanometer according to the embodiment will be explained according to the flowchart of FIG. 3 and the cuff pressure characteristic diagram of FIG. 4.

When the operation switch 12 is operated, an operation signal from the operation switch 12 for measuring the blood pressure value is given to the control means 101. The control means 10 that has been given the operation signal starts its operation.

In step n1, the pressurization signal output means 18 of the control means lθ outputs a pressurization signal to the pressure pump 4 in response to the applied operation signal. The pressurizing pump 4 pressurizes the cuff 2 in response to the pressurizing signal. This results in
The cuff 2 is pressurized to a cuff pressure PO as shown in FIG.

Then, when the cuff pressure reaches PO, pressurization of the cuff 2 is stopped. In FIG. 4, SO is during pressurization of cuff 2, Sl is during pressurization of cuff 2 is stopped 5 (the cuff pressure is maintained at the pressurization value), and S2 is when cuff 2 is being evacuated. are shown respectively.

In step n2, the control means 10 controls the timer 24
starts the operation of the pulse pressure signal detection means 23.
It is determined whether or not a pulse pressure signal (a signal representing a vibration component due to arterial pulsation) from the pulse pressure sensor 8 has been detected.

If it is determined that no pulse pressure signal has been detected (NO), the process advances to state n3. In step n3, timer 2
4 determines whether or not time has elapsed after a certain period of time has elapsed. Until this certain period of time has elapsed,
Since the pressurizing operation of the pressurizing pump 4 has been stopped, the pulse pressure signal detection means 23 detects the pulse pressure signal in step n2 while the pressurizing operation is stopped.

Then, if a pulse pressure signal is not detected in step n2 until a certain period of time has elapsed, and the certain period of time has elapsed, it is determined to be YES in step n3, and step n
Proceed to step 4.

In step n4, it is determined that the vibration component due to the pulsation of the artery is not detected, and the process proceeds to step n5. In step n5, it is determined whether the detection conditions for systolic blood pressure and diastolic blood pressure are satisfied. If it is determined that this does not hold true (No), a pressurization signal is output from the pressurization signal output means 18 to pressurize the cuff 2 by one step in step n6. As a result of this pressurization, the cuff 2 is pressurized to a cuff pressure P1 as shown in FIG. After this, the process returns to step 2 and repeats each of the above steps. When the pressurization of the cuff 2 reaches cuff pressure P2, in step n2, the pulse pressure sensor 8 responds to the pulse pressure signal to generate a pulse pressure signal. The detection means 23 outputs the pulse pressure signal to the blood pressure value determination means 20. The blood pressure value determining means 20 determines the diastolic blood pressure value according to the pulse pressure signal and stores the diastolic blood pressure value. Next, the process moves to step n5, but in this step n5, the conditions for detecting the diastolic blood pressure are met, but the conditions for detecting the systolic blood pressure are not satisfied, so it is determined No and the process moves to step n6. In step n6, the cuff pressure is increased by one step. After repeating each of the above steps in the same manner, the cuff pressure becomes pressurized P.
3, in step n2, the blood pressure value determining means 20 determines the systolic blood pressure value based on the pulse pressure signal from the pulse pressure signal detecting means 23, and stores the systolic blood pressure value. Once the diastolic blood pressure and systolic blood pressure are determined in this way, it is determined in step n5 that the detection conditions for the diastolic blood pressure and systolic blood pressure are satisfied, and the process proceeds to step n7.

In step n7, the blood pressure value determination means 20 outputs a blood pressure value determination completion signal to the rapid exhaust signal output means 22.

The rapid exhaust signal output means 22 operates in response to the signal and operates the rapid exhaust valve 6. As a result, the inside of the cuff 2 is rapidly evacuated. Then, in step n8, the blood pressure value determining means 20 provides the display signal of the diastolic blood pressure value and the systolic blood pressure value to the display device 4, whereby the display device 4 displays the systolic blood pressure value and the diastolic blood pressure value. do. This completes the measurement of the blood pressure value.

Therefore, in the electronic blood pressure monitor of this embodiment, since the blood pressure value is measured while the pressurizing operation to the cuff 2 is stopped, the blood pressure value can be measured without discriminating the noise component accompanying the operation of the pressure pump 4. be able to.

(Effects) As is clear from the above explanation, according to the present invention,
Since the operation of the pressurizing means is stopped when measuring the blood pressure value, there is no need to discriminate between the noise component from the pressurizing means and the pulse pressure signal from the pulse pressure sensor, making it easy to do so without using expensive discrimination means. Blood pressure values can be measured quickly and accurately, and since the cuff is rapidly evacuated when the diastolic blood pressure is measured and then the systolic blood pressure is measured, even if the systolic blood pressure values differ from person to person. , higher than the systolic blood pressure than necessary (blood pressure can be measured without the need to increase cuff pressure,
Therefore, it is possible to provide an electronic blood pressure monitor that can alleviate the feeling of pressure on the subject due to the cuff pressure and alleviate the pain caused by the pressure.

[Brief explanation of drawings]

1 to 4 relate to an embodiment of the present invention, FIG. 1 is a configuration diagram of an electronic blood pressure monitor according to the embodiment, FIG. 2 is a circuit diagram of the control means in FIG. 1, and FIG. FIG. 4, a flowchart for explaining the operation, is a diagram showing changes in cuff pressure. FIG. 5 is a diagram showing changes in cuff pressure in a conventional electronic blood pressure monitor. In the figure, code 2...cuff, 4...pressure pump, 6...
- Rapid exhaust valve, 8... Pulse pressure sensor, IO... Control means, 18... Pressure signal output means, 20... Blood pressure value determination means, 22... Rapid exhaust signal output means.

Claims (1)

[Claims] (1) A cuff for compressing an artery of a subject; a pressurizing means for increasing the pressure value applied to the cuff every time a pressurizing signal is applied, and pressurizing the cuff; and an operation in response to a rapid exhaust signal. rapid evacuation means for rapidly evacuation of the inside of the cuff; detecting arterial pulse pressure transmitted to the cuff;
A pulse pressure sensor that outputs the detection output as a pulse pressure signal, and a control means that controls the output of the pressurization signal and the rapid exhaust signal, and controls the processing of the pulse pressure signal from the pulse pressure sensor. , the control means includes: a pressurization signal output means for intermittently outputting the pressurization signal to the pressurization means; and a pressurization signal output means that outputs the pressurization signal from the pressurization signal output means when the output of the pressurization signal is stopped. blood pressure value determining means for processing a pulse pressure signal from the sensor to determine a diastolic blood pressure value and a systolic blood pressure value; and rapid exhaust signal output means for outputting the rapid exhaust signal.