JP2804484B2 - Blood pressure measurement device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a blood pressure measurement device that measures blood pressure by wrapping a cuff band around a wrist.

[Prior Art] Conventionally, as shown in FIG. 6, a cuff band 3 of a blood pressure measuring device of this type is smaller than a general cuff band wound around an upper arm. It is wound around and fixed to the wrist 1, and pressurizes and pressurizes air through the nozzle 5 a and the pipe 5 b to the blood blocking bag in the cuff band 3, and exhausts the air through the nozzle 5 a and the pipe 5 b. It has become. Here, the blood pressure measurement is performed by an indirect measurement method of determining blood pressure by capturing arterial sounds and pulsations generated in the process of compressing and blocking the radial artery 2a and the ulnar artery 2b.

[Problem to be Solved by the Invention] However, in the above-described conventional example, there is a problem that a blood pressure measurement error is likely to occur due to a shift in the mounting position of the cuff band 3. That is, as shown in FIG. 6, the wrist 1 has a radius 6a and an ulna 6b, and the tendons 7 are concentrated on the surface of the medial central portion. The cuff band 3 needs to abut appropriately on both arteries 2a and 2b in such a complicated structure to compress both arteries 2a and 2b, as shown by arrows in FIG. When the cuff band 3 is worn while being shifted in the circumferential direction of the wrist 1, there is a problem that the pressure is insufficient and a blood pressure measurement device is generated. Note that the permissible value of circumferential displacement is 20
~ 50mm.

The present invention has been made in view of the above points, and an object of the present invention is to provide a blood pressure measurement device capable of preventing a cuff band from being displaced and making a blood pressure measurement error less likely to occur. It is in.

[Means for Solving the Problems] The blood pressure measurement device of the present invention compresses and blocks the radial artery and the ulnar artery with a cuff band wound around the wrist, and performs blood pressure measurement based on arterial sounds and pulsations obtained in the process. In a blood pressure measurement device that is configured to measure a pulse wave detection sensor corresponding to a position where at least one of the radial artery or the ulnar artery of the cuff band abuts, based on the output of the pulse wave detection sensor. The apparatus is provided with a displacement determining means for determining a displacement of the cuff band, and a notifying means for notifying when the displacement is detected.

[Operation] The present invention is configured as described above, and a pulse wave detection sensor is arranged corresponding to a position of the cuff band where at least either the radial artery or the ulnar artery abuts. Since there is provided a misalignment determining means for judging misalignment of the cuff band based on the output, and a notifying means for notifying when the misalignment is detected, the notifying means notifies the misalignment when the cuff band is not properly mounted. Thus, it is possible to correct the mounting position of the cuff band, and it is possible to prevent the blood pressure measurement device from being generated due to a shift in the mounting position of the cuff band.

FIG. 1 shows an embodiment of the present invention, in which a cuff band 3 wrapped around a wrist 1 compresses a radial artery 2a or an ulnar artery 2b.
In a blood pressure measurement device configured to measure blood pressure based on arterial sound and pulsation obtained in the process of blood ischemia, the cuff band 3 is placed at a position where at least one of the radial artery 2a or the ulnar artery 2b abuts. Corresponding pulse wave detection sensors 9a, 9b
And a displacement determining means 10 for determining the displacement of the cuff band 3 based on the outputs of the pulse wave detection sensors 9a and 9b. In the embodiment, the pulse wave detection sensors 9a, 9b
Are integrated as a sensor block 8 and attached to the artery contact portion of the cuff band 3. The pulse wave detection sensor 9
Needless to say, either a or 9b may be provided.

FIG. 2 shows a specific example, in which the artery abutting portions 3a, 3a ', 3b, 3b' of the cuff band 3 are made translucent, and are constituted by a light emitting element comprising a photodiode and a light receiving element comprising a phototransistor. The photoelectric pulse wave detection sensors 9a, 9b are arranged corresponding to the pulsation contact portions 3a, 3a ', 3b, 3b' to detect a pulse wave. In the following, when the position shift detection signal Vd is output from the position shift determining unit 10, the position shift is displayed on the display device 11 as the notification unit. In the figure, 12 is a pressurizing / depressurizing device, 13 is a pressure sensor, 14 is a computing device,
12 controls the arterial compression by the cuff band 3, and the pressure sensor 13
The cuff pressure on which the pulse wave is superimposed is detected, and the highest and lowest blood pressure are determined based on the output of the pressure sensor 13 in the arithmetic unit 14,
The display device 11 is configured to display the information.

FIG. 3 shows another specific example, in which the peripheral portions 3a ", 3b" of the cuff band 3 on the side surface of the wrist are partially mirror-finished, and the pulsation of both arteries 2a, 2b is determined by photoelectric pulse. The wave detection sensors 9a and 9b may detect the wave.

FIG. 4 shows still another specific example, in which Doppler ultrasonic sensors are used as the pulse wave detection sensors 9a 'and 9b'.
It detects the pulsation of the inner surface of the cuff band 3 due to the pulsation of the two arteries 2a and 2b, and the oscillation frequency of the Doppler ultrasonic sensor is as low as the frequency used for a distance meter or an obstacle sensor. The frequency (about 50kHz) is set.

FIG. 5 shows a specific example of the displacement determination means 10. The output Vo of the pulse wave detection sensors 9a, 9b or 9a, 9b is subjected to impedance conversion and level conversion by the sensor interface 10a. V
o 'is the comparison input terminal (minus terminal) of comparator 10b
To determine whether a normal-level pulse wave is obtained. To the reference input terminal (plus terminal) of the comparator 10b, a judgment reference value Vs preset by the volume control 10c is input, and when the sensor interface output Vo ′ becomes lower than the judgment reference value Vs,
The output of the comparator 10b becomes “H” and the displacement detection signal V
d is output. The position shift is displayed on the display device 11 by the position shift detection signal Vd. Therefore, it is recognized that the cuff band 3 is not properly mounted by the position shift display, and the mounting position of the cuff band 3 is corrected to prevent the occurrence of a blood pressure measurement error due to the shift of the cuff band 3 mounting position. You can do it.

[Effects of the Invention] As described above, the present invention arranges a pulse wave detection sensor corresponding to a position where at least either the radial artery or the ulnar artery of the cuff band abuts, and based on the output of the pulse wave detection sensor. Since there is provided a position shift determining unit that determines the position shift of the cuff band, and a notifying unit that notifies when the position shift is detected,
When the cuff band is not properly worn, the notifying unit notifies the misalignment, and the mounting position of the cuff band can be corrected, and the occurrence of a blood pressure measurement error due to the misalignment of the cuff band can be prevented. It has the advantage that.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a main part of one embodiment of the present invention, FIG. 2 is a schematic diagram of a main part showing a specific example of the above, FIG. FIG. 5 is a schematic diagram of a main part showing still another specific example, FIG. 5 is a specific circuit diagram of the main part of the embodiment, and FIG. 1 is a wrist, 2a and 2b are arteries, 3 is a cuff band, 9a and 9b are pulse wave detection sensors, and 10 is a displacement detection means.

Claims (1)

(57) [Claims] 1. A blood pressure measuring device which compresses and blocks a radial artery and an ulnar artery by a cuff band wound around a wrist and measures blood pressure based on arterial sound and pulsation obtained in the process. Position shift determining means for arranging a pulse wave detection sensor corresponding to a position where at least either the radial artery or the ulnar artery of the cuff band abuts, and determining a position shift of the cuff band based on an output of the pulse wave detection sensor. And a notifying means for notifying when a displacement has been detected.