JP3057347B2 - Blood pressure measurement device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blood pressure measurement device capable of automatically correcting a blood pressure measurement value according to the outer peripheral length of a measurement site such as an upper arm around which a cuff is wound.

[0002]

2. Description of the Related Art A sphygmomanometer includes a cuff as a compression band wound around an upper arm of a measurement site, a pump for pressurizing the cuff,
A cuff pressure control unit for controlling pressurization and decompression of the cuff;
And a blood pressure measurement unit that measures the blood pressure of the subject from the relationship with the cuff pressure. Normally, with this sphygmomanometer, the cuff wrapped around the subject's upper arm is pressurized above the systolic blood pressure value, then gradually decompressed, and the systolic blood pressure value is obtained from the cuff pressure at the time when the blood flow sound starts to be heard. The minimum blood pressure value is obtained from the cuff pressure at the time when the blood flow sound disappears. By the way, when measuring blood pressure using a cuff like this,
An error accompanies the blood pressure value measured due to individual differences in the outer peripheral length of the upper arm. The manner in which this error appears is measured as a blood pressure value lower than the actual blood pressure for a subject with a thin arm, and is measured as a blood pressure value higher than the actual blood pressure value for a subject with a thick arm.

[0003]

Therefore, conventionally, a cuff has been devised in which a scale is printed on the outer peripheral surface of the cuff so that the outer peripheral length of the measurement site can be measured. The correct blood pressure value could be measured in comparison. However, in such a blood pressure measurement, an operation of measuring the upper arm circumference and an operation of checking the correction table are required, and there has been a problem that the blood pressure measurement is complicated.

[0004] The present invention has been proposed to solve such problems of the prior art, and is a blood pressure measurement device capable of automatically correcting a blood pressure value according to the outer peripheral length of a measurement site. The purpose is to provide.

[0005]

According to the present invention , a cuff is attached to a measurement site of a subject, and the cuff is attached to the subject.
Automatically measure the subject's blood pressure while controlling the pressure
In a blood pressure measurement device, the cuff body is
When wrapped around the cuff,
A conductive terminal provided on one end of the body and a plurality of conductive terminals provided on the other end.
Cuff with one of the electrical terminals conducting
Perimeter length detecting means provided for detecting the perimeter of the measurement site
Receiving the detection signal of the outer circumference length detecting means,
A measuring part circumference calculating circuit for calculating an outer peripheral length, and a measuring part
A memo storing the blood pressure correction value to be corrected according to the outer circumference
And the outer circumference output from the measurement site circumference calculation circuit.
The blood pressure correction value is read from this memory based on the
Blood pressure to calculate this correction value for the blood pressure value of the subject
And a value correction circuit.

[0006]

According to the above construction, when the cuff is attached to the measurement site, the circumference of the measurement site can be obtained by the measurement site circumference calculation circuit, and the blood pressure measurement value is calculated based on the circumference. Can be corrected automatically.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a specific embodiment of the blood pressure measuring device according to the present invention will be described in detail with reference to the drawings. FIG. 1 shows a perspective view of a cuff used in the blood pressure measurement device. In this figure, a convex surface 2 and a concave surface 3 of a magic tape are attached to one end on the inner peripheral side and the other end on the outer peripheral side of the cuff main body 1, respectively. By pressing the convex surface 2 of the magic tape against the concave surface 3 at the time, the cuff can be attached to the measurement site. Further, a strip-shaped conductive terminal 4 is attached to the magic tape convex surface at one end on the inner peripheral side of the cuff main body 1 over the width of the cuff.
A plurality of strip-shaped conductive terminals 5 that are in contact with the conductive terminals 4 when the cuff is mounted are attached to the concave portion of the magic tape at the other end on the outer peripheral side at equal intervals in the cuff circumferential direction. Here, each conductive terminal 5 is attached at, for example, 2 cm intervals,
The conductive terminal 4 contacts one of the conductive terminals 5 according to the outer peripheral length of the measurement site. For example, if the innermost conductive terminal 5 is provided at a position having an outer peripheral length of 26 cm, the fifth conductive terminal 5 from the conductive terminal is provided at a position having an outer peripheral length of 36 cm.

Next, the configuration of the blood pressure measurement unit to which the cuff is connected will be described with reference to FIG. Conductive terminal 4 on cuff side
And each conductive terminal 5 is connected to a cuff contact position detection circuit 7 by a connection cable 6 extending from the cuff. The cuff contact position detection circuit 7 detects which conductive terminal 5 the conductive terminal 4 has contacted when the cuff is attached, and sends a detection signal to the measurement site circumference calculation circuit 8. The measurement site circumference calculation circuit 8 calculates the circumference of the measurement site based on the data stored in the memory 9 in advance, based on which conductive terminal 4 is in contact with which conductive terminal 5. On the other hand, the cuff has a pressurizing pump 11 driven by a pump control circuit 10.
Are connected by a rubber tube via an air tank 12. An exhaust valve 1 controlled by a valve control circuit 13 is provided between the air tank 12 and the pressure pump 11.
4 are connected. A pressure sensor 15 for measuring the cuff pressure is connected to the air tank 12, and a detection signal of the sensor 15 is sent to a blood pressure value detection circuit 16. A microphone 17 for detecting a blood flow sound is attached to the cuff, and an output signal of the microphone 17 is sent to a blood flow sound detection circuit 21 via a preamplifier 18, an auto gain amplifier 19 and a frequency filter 20. . The output signal of the blood flow sound detection circuit 21 is sent to the blood pressure value detection circuit 16, and the maximum and minimum blood pressure values of the subject are measured from the cuff pressure detection signal from the pressure sensor 15 and the blood flow sound detection signal.
The measured blood pressure value is sent to the blood pressure value correction circuit 22 to which the calculation signal from the measurement site circumference calculation circuit 8 is supplied. Memory 2 connected to this blood pressure value correction circuit 22
3, a correction value for the systolic blood pressure value (SBP) and a correction value for the diastolic blood pressure value (DBP) to be corrected according to the outer peripheral length of the measurement site are stored. The correction of the measured blood pressure value in the circuit 22 is automatically performed. Note that this correction value has a cuff width of 15c.
This corresponds to the correction table of the American College of Cardiology when m cuffs are used. Regardless of this correction table, "Ragan
& Bordley "correction table may be used. The corrected maximum and minimum blood pressure values are displayed on the display unit 24. In addition,
Measurement site circumference calculation circuit 8, pump control circuit 1
0, valve control circuit 13, blood pressure value detection circuit 1
6. The operation of the blood pressure value correction circuit 22 is controlled by the control unit 25. Here, the measurement site circumference calculation circuit 8, the blood pressure value detection circuit 16, the blood pressure value correction circuit 22, the control unit 25
Can be constituted by a CPU (microprocessor).

Next, the operation of the blood pressure measuring device thus configured will be described with reference to the flowchart of FIG. First, the cuff is wrapped around the subject's upper arm, which is the measurement site. At this time, the conductive terminal 4 on one end side of the cuff depends on the outer peripheral length of the upper arm.
Is in contact with one of the conductive terminals 5 on the other end side, and the outer circumference of the upper arm is measured by the measurement site circumference calculation circuit 8 which receives a detection signal of the conductive terminal 5 that has become conductive (step S).
1). Subsequently, the pressurizing pump 11 is driven by the pump control circuit 10, and the cuff is turned off by +3
The pressure is increased to about 0 mmHg (about +30 mmHg higher than the systolic blood pressure value) (step S2). Subsequently, the opening of the exhaust valve 14 is adjusted by the valve control circuit 13, and the pressure of the cuff is gradually reduced (Step S).
3). During the depressurization of the cuff, the point in time when the sound of the blood flow starts to be detected is detected, and the systolic blood pressure value of the subject is measured by the blood pressure value detecting circuit 16 which receives a signal from the pressure sensor 15 (step S4). When the systolic blood pressure value is sent to the blood pressure value correction circuit 22, the correction value read from the correction table 23a of the memory 23 based on the outer circumference value sent from the measurement site circumference calculation circuit 8 is used as the maximum value. It is added to or subtracted from the high blood pressure value (step S5). For example, if the outer circumference of the upper arm of the subject is 32 cm, a correction value +3 mmHg is added to the systolic blood pressure value. The corrected systolic blood pressure value is displayed on the display unit 24 (step S6). Further, in the course of the depressurization of the cuff, the disappearance point of the blood flow sound is detected, and the diastolic blood pressure value of the subject is measured by the blood pressure value detecting circuit 16 (Step S).
7). The blood pressure value correction circuit 22
Then, the correction value read from the memory 23 is added or subtracted (step S8). For example, the outer circumference of the upper arm is 32
cm, the correction value for the diastolic blood pressure value +2 mmHg
Is added. The corrected diastolic blood pressure value is displayed on the display unit 24 (Step S9). After the measurement of the diastolic blood pressure value, the valve 14 is opened and the air is quickly exhausted, and the blood pressure measurement is completed (step S10).

Next, another embodiment shown in FIG. 5 will be described. In this embodiment, instead of using the magic tape, the cuff can be attached to the measurement site T of the subject by the hook 26 provided at one end of the cuff main body 1 and the plurality of hook receivers 27 provided at the other end. ing. The hook 26 and the hook receiver 27 also serve as conductive terminals.
7 to be locked. Therefore, the outer peripheral length of the measurement site can be detected based on which hook receiver 27 is locked.

[0011]

As described above, according to the present invention, the blood pressure value can be automatically corrected and measured even when the circumference of the upper arm of the measurement site is different due to individual differences, so that the blood pressure with high accuracy can be obtained. Measurement can be performed easily.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a cuff used in a blood pressure measurement device according to the present invention.

FIG. 2 is a block diagram showing one embodiment of a blood pressure measurement device according to the present invention.

FIG. 3 is a diagram showing a correction table stored in a memory.

FIG. 4 is a flowchart showing the operation of the blood pressure measurement device.

FIG. 5 is a view showing a cuff according to another embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Cuff main body 2 Convex surface of magic tape 3 Concave surface of magic tape 4 Conductive terminal 5 Conductive terminal 6 Connection cable 7 Cuff contact position detection circuit 8 Measurement site circumference calculation circuit 9 Memory 10 Pump control circuit 11 Pressurization circuit 12 Air tank 13 Valve Control circuit 14 Exhaust valve 15 Pressure sensor 16 Blood pressure value detection circuit 17 Microphone 18 Preamplifier 19 Auto gain amplifier 20 Frequency filter 21 Blood flow sound detection circuit 22 Blood pressure value correction circuit 23 Memory 24 Display unit 25 Control unit 26 Hook 27 Hook receiver

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A61B 5/00 A61B 5/03

Claims (1)

(57) [Claims] 1. A blood pressure measurement device for automatically measuring a subject's blood pressure value while controlling a pressure of the cuff by attaching a cuff to a measurement site of the subject and wrapping the cuff body around the measurement site of the subject. , Measurement
Conductive end provided on one end side of the cuff body according to the perimeter of the part
One of the conductive terminals provided on the other end
A cuff provided on the cuff, a perimeter detecting means for detecting the perimeter of the measuring part, and a perimeter calculating the perimeter of the measuring part by receiving a detection signal from the perimeter detecting means. A circuit, a memory storing a blood pressure correction value to be corrected according to the outer circumference of the measurement site, and a blood pressure correction value read out from the memory based on the outer circumference output from the measurement site circumference calculation circuit, and measured. A blood pressure value correction circuit for calculating the correction value for the blood pressure value of the subject.