JPH04250132A - Electronic blood pressure meter - Google Patents

Abstract

PURPOSE:To determine and display a degree of arteriosclerosis accordance with a correlation between a minimum blood pressure value and pulses. CONSTITUTION:There are provided a measuring means 51 for measuring maximum and minimum blood pressures, a pulsative pressure calculating means 54, a determining circuit 55 for determining a degree of arteriosclerosis in accordance with the minimum blood pressure or an averaged blood pressure and a pulsative pressure, and a display means 56 for displaying a blood pressure and a degree of arteriosclerosis.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic blood pressure monitor.

0002

[Prior Art] In recent years, some electronic blood pressure monitors have been added with various additional functions, but most of these blood pressure monitors can only measure blood pressure, and can also measure pulse rate. There are just things that are made like this.

0003

[Problems to be Solved by the Invention] However, from the viewpoint of health management, there is a need for something that can provide even more barometers of health, and one of these is the degree of arteriosclerosis. The present invention has been made in view of these points, and its object is to provide an electronic blood pressure monitor that can also determine the degree of arteriosclerosis when measuring blood pressure.

0004

[Means for Solving the Problems] The present invention includes means for measuring systolic blood pressure and diastolic blood pressure, means for calculating pulse pressure, and determining the degree of arteriosclerosis from the diastolic blood pressure value or mean blood pressure value and pulse pressure. It is characterized by comprising a determination circuit and display means for displaying blood pressure values and arteriosclerosis degrees.

According to the present invention, not only blood pressure but also the degree of arteriosclerosis, which is one of the causes of hypertension, is determined and displayed at the same time.

[0006]

[Embodiment] The present invention will be described in detail below based on the illustrated embodiment.The illustrated blood pressure monitor includes a cuff band 1, a pressurizing device 2 that pressurizes the cuff band 1, and a pressure device that detects the pressure of the cuff band 1. The exhaust valve 4 is composed of an electromagnetic valve that reduces the pressure in the cuff band 1 by exhausting air, and a control circuit 5.

As shown in FIG. 1, the control circuit 5 here includes a pressure measurement circuit 50, a blood pressure measurement determination circuit 51 that determines the systolic blood pressure and diastolic blood pressure from the pulse wave, and a pressurization device control circuit that controls the pressurization device 2. A circuit 52, a valve control circuit 53 that opens and closes the exhaust valve 4, a pulse pressure value calculation circuit 54 that calculates the pulse pressure that is the difference between the systolic blood pressure value and the diastolic blood pressure value, and the degree of arterial stiffness from the pulse pressure value and the diastolic blood pressure value. an arteriosclerosis degree determination circuit 55 that determines
It is formed of a display circuit 56 that displays the obtained systolic blood pressure value, diastolic blood pressure value, and degree of arteriosclerosis, a start switch 57, and the like. 6 in FIG. 2 is a power switch.

As the display circuit 56, as shown in FIG. 3, a liquid crystal panel is used here, and the systolic blood pressure value and the diastolic blood pressure value are digitally displayed, and the degree of arteriosclerosis is displayed in four stages. Each is displayed in a bar graph format. Note that FIG. 3(a) shows a case where the degree of arteriosclerosis is severe, and FIG. 3(b) shows a case where the degree of arteriosclerosis is normal.

Next, the determination criteria in the arteriosclerosis degree determination circuit 55 will be explained. When arteriosclerosis occurs, it generally results in high blood pressure symptoms, which are caused not only by increased blood circulation resistance and increased vascular wall elasticity due to arteriosclerosis, but also by physical activity, excitement, anger, anxiety, It also occurs due to increased blood circulation resistance due to vasoconstriction due to sympathetic nerve activity such as pain, or body defense reactions such as thermoregulatory reflexes to the external environment such as temperature and humidity.

[0010] However, with an increase in circulatory resistance, the mean blood pressure and diastolic blood pressure increase, as well as the pulse pressure. However, an increase in the elastic modulus of the blood vessel wall due to arteriosclerosis causes the pulse pressure to increase more than in the above case. becomes larger. In other words, the diastolic phase of the heart (
When the volume of the arterial system during the diastolic phase is V, and the increase in blood pressure (pulse pressure) when blood is pushed into the arterial system by dV due to cardiac contraction is dP, then dP=kdV/V
The following formula holds true: (k is the elastic modulus of the blood vessel wall), and as the elastic modulus k of the blood vessel wall increases, the pulse pressure dP also increases. Diastolic blood pressure value Pd
An example of this is shown in FIG. 4, which shows the correlation between dP and pulse pressure dP. A shows the case of a normal artery, and B shows the case of a hardened artery.

The present invention focuses on this point and is designed to determine the degree of arteriosclerosis from the correlation between the diastolic blood pressure value and the pulse pressure. However, as is clear from Figure 4, in areas where the diastolic blood pressure is 60 mmHg or higher, hardened arteries tend to exhibit higher blood pressure due to the influence of the arterial vessel wall elastic modulus, but this change is not uniform; Since it shows a curve-like change, the following discriminant function f1 (Pd)=a1 Pd2 +b1 Pd+c1
f2 (Pd)=a2 Pd2 +b2 Pd+c2
f3 (Pd)=a3 Pd2 +b3 Pd+c3
(However, a1 , a2 , a3 >0) is set, and the degree of arteriosclerosis is determined based on this discriminant function. In other words, as shown in Figure 5, by dividing the correlation diagram between diastolic blood pressure and pulse pressure values using the above three discriminant functions, the degree of arterial stiffness is determined depending on which region the measured diastolic blood pressure value and pulse pressure value are located. In the figure, if it is located in area A, it is normal, if it is in area B, it is mild arteriosclerosis, if it is in area C, it is moderate arteriosclerosis, and if it is in area D, it is This is determined to be severe arteriosclerosis.

[0012] In order to make more accurate judgments, the diastolic blood pressure values and pulse pressure values from multiple blood pressure measurements are memorized, and judgments are made based on the average value of these values. It's okay. Further, the display section of the degree of arteriosclerosis in the display circuit 56 may directly display the correlation diagram shown in FIG. 5. In order to correlate with the pulse pressure value, the average blood pressure value may be used instead of the diastolic blood pressure value.

[0013]

[Effects of the Invention] As described above, in the present invention, not only blood pressure but also the degree of arteriosclerosis, which is one of the causes of high blood pressure, is judged and displayed at the same time. This makes it easier to understand the status.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram of an embodiment of the present invention.

FIG. 2 is a perspective view of the same as above.

FIG. 3 is a front view of the same display circuit as above, in which (a) shows a case of severe arteriosclerosis, and (b) shows a case of normal arteriosclerosis.

FIG. 4 is a characteristic diagram showing the correlation between pulse pressure values and diastolic blood pressure values.

FIG. 5 is a characteristic diagram illustrating an operation for determining the degree of arteriosclerosis.

[Explanation of symbols]

51　Blood pressure measurement judgment circuit 54 Pulse pressure value calculation circuit 55 Arteriosclerosis degree determination circuit 56 Display circuit

Claims (1)

[Claims] [Claim 1] A means for measuring systolic blood pressure and diastolic blood pressure;
The device is characterized by comprising a means for calculating pulse pressure, a determination circuit for determining the degree of arteriosclerosis from the diastolic blood pressure value or the average blood pressure value and the pulse pressure, and a display means for displaying the blood pressure value and the degree of arteriosclerosis. Electronic blood pressure monitor.