JPH0277234A - Pulse wave measuring instrument - Google Patents

Abstract

PURPOSE:To substantially eliminate the influence of the bodily movement of a pulse wave measuring means and to allow exact pulse wave measurement by integrally providing a pulse wave measuring means which irradiates a living body with the light emitted from a light emitting element and measures pulse waves by receiving the waves or light reflected by or transmitted through the living body by a light receiving element and a skin electric resistance measuring means which measures the skin electric resistance from the current flowing between electrodes mounted to the two points of the living body. CONSTITUTION:The living body A is irradiated with the ray flux of a specified quantity from the light emitting element 1 and the light reflected by or transmitted through the living body A is received by the light receiving element. The change in the output current of this light receiving element 2 is converted to a voltage change in a current- voltage converting circuit 5 connected to the output of the light receiving element 2 and the pulse wave signal is taken out. The skin electric resistance detecting part is connected to a sensing part 5 made of a sensor S constituted of both electrodes 3, 6 into a bridge constitution and measures the skin electric resistance by making use of the change in the current flowing in the sensor S generated by the skin electric resistance which changes with the mental condition of the living body.

Description

DETAILED DESCRIPTION OF THE INVENTION 1. Field of Industrial Application 1. The present invention relates to a photoelectric conversion type pulse wave measuring device that detects a pulse wave by irradiating a living body with light and receiving light reflected or transmitted by the living body. It is something.

[Conventional technology l] Conventional pulse wave measurement devices have a light-emitting element such as a light-emitting diode, and a)) a light-receiving element such as a lannostar or solar cell, which are placed close to the living body to direct light to the living body. The blood [
There is a device that detects a pulse wave by replacing the change in the amount of received light with a change in the amount of received light (for example, a photoelectric conversion type pulse wave detection device described in Japanese Patent Application No. 63-32280).

■Problems to be Solved by the Invention 1 However, this conventional pulse wave measuring device has a problem in that it is susceptible to body movements and cannot accurately measure pulse waves.

The present invention has been made in view of the above-mentioned points, and its purpose is to provide a pulse wave measuring device that is less susceptible to II distortion due to body movements.

[! Means for Solving Problem I 1゜In order to achieve the above object, the present invention arranges a light emitting element and a light receiving element in close proximity to a living body, and prevents reflected waves or transmission by the living body of light irradiated from the light emitting element. a pulse wave measuring means for measuring a pulse wave by receiving light with a light receiving element;
It is integrally equipped with an electrical skin resistance measuring means for measuring electrical skin resistance from a current flowing between electrodes attached to a location.

(Function) By providing the electrical skin resistance measuring means integrally with the pulse wave measuring means as described above, the present invention uses the output of the electrical skin resistance measuring means to detect fluctuations in the detected pulse wave in the autonomic nervous system. The detection accuracy can be improved by making it possible to distinguish between C1 and whether it is due to physical movement or body movement.

(Example) An embodiment of the present invention is shown in FIGS. 1 to 7.

The pulse wave detecting section of the pulse wave measuring device of this embodiment has a light emitting element 1 such as a light emitting diode on the top surface of a flat case 4 shown in FIG. It is exposed and placed and formed. In this pulse wave detection section,
Place the living body A (thumb in this example) on the light emitting element 1 and the light receiving element 2 as shown in FIG. At the same time, the light receiving element 2 receives the reflected light or the transmitted light from the living body A, and the change in the output current of the light receiving element 2 is converted into a voltage change by the current voltage conversion circuit 5 connected to the output of the light receiving element 2. Then, the pulse wave signal is extracted. This pulse wave measuring device has an integrated skin electrical resistance measuring device that attaches electrodes to two places on the skin of living body A and measures the electrical skin resistance from the current flowing between the electrodes. It is designed to detect movement. One electrode 3 of this pulse wave measuring device is a ring-shaped electrode plated with silver, and is provided on the upper surface of the case 4 so as to surround the light emitting element 1 and the light receiving element 2 on the upper surface of the case 4. Note that this electrode 3 is brought into contact with the ventral side of the thumb as shown in FIG. 7(a).
), the case 4 is fixed to the thumb using an appropriate fixing means such as a band. The other electrode 6 is provided in a case 17 that is worn on the wrist and has a circuit housed inside.This electrode 6 also has the same shape as the electrode 3, and is shown in FIG.
), the electrode 6 is brought into contact with the skin. The electrical skin resistance detection section of this electrical skin resistance measuring device has a picture electrode 3.6.
The sensor S composed of It measures electrical resistance. From the electrical skin resistance detected by this electrical skin resistance device, a person's mental state, especially during sleep, can be ascertained. In this embodiment, this electrical skin resistance device is used to detect body movement.

Further, the cases 4 and 17 provided with the respective electrodes 3 and 6 are integrally connected by a lead wire 7.

The circuit configuration of this example is shown in Figure #41. In this example,
The outputs of the pulse wave detection circuit 8 and the electrical skin resistance detection section 9 are amplified and filtered by amplification/filter sections 10 and 11, respectively. The outputs of the respective amplification/filter sections 10 and 11 have waveforms shown in tJ42 diagrams (a) and (c). Note that a in FIG. 2(a) is an output due to pulse waves, a is an output due to body movement, and C in FIG. 2(c) is an output due to body movement. Then, the output of this amplification/filter filO, 11 is passed through comparators 12, 13. Here, when the output port due to body movement passes through the comparator 12, it becomes an output waveform shown in 2 of FIG. 2(b). In order to eliminate the output caused by this body movement, the output of the comparator 13 is inverted by the inverting circuit 14, and the AND circuit 15 takes the seventh output of the comparator 12 and the inverting circuit 14, respectively.

As a result, as shown in FIG. 2(e), the pulse wave detection circuit 8
The output is removed by body movement. If the pulse wave is measured from the output of the AND circuit 15 obtained in this way, it becomes possible to measure the pulse wave with high precision, excluding the influence of body movement. These circuits are built into a case 17 that is worn on the wrist, and the output of the AND circuit 15 is sent by a transmitting circuit 16 to a processing device No. 46 consisting of a separate pan controller or the like. In this case, connect the lead wire 7 connecting the fingertips and wrist to FM.
Used as a 7 antenna for telemetry. By the way, instead of processing the pulse wave and electrical skin resistance as described above and then sending them to the signal processing device, it is better to send the signals detected by each measurement device separately, and then send the signals detected by each measurement device separately, so that the signal processing device can process the signals from the body. Signal processing may be performed to remove the influence of motion.Using this pulse wave measuring device has the effect of making it possible to grasp a person's mental state, especially during sleep.

[Effects of the Invention 1] As described above, the present invention provides a light-emitting element and a light-receiving element that are disposed close to a living body, and the light-receiving element receives reflected waves or transmitted light from the living body of light emitted from the light-emitting element. Since it is equipped with a pulse wave measuring means that measures the pulse wave by the pulse wave and a skin electrical resistance measuring means that measures the electrical skin resistance from the current flowing between the electrodes attached at 2111 points on the living body, it is possible to measure the electrical skin resistance. Based on the electrical skin resistance measured by the device, it is possible to determine whether the output of the pulse wave measuring device is due to pulse wave fluctuations caused by the autonomic nervous system or body movements, which improves the accuracy of pulse wave detection. There are effects that can be improved. Further, if the body movement is detected by the electrical skin resistance measuring means and the output of the electrical skin resistance measuring means is used to remove the output due to the body movement from the output of the pulse wave measuring means,
This has the effect that the pulse wave measuring means is less susceptible to body movements and can accurately measure pulse waves.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIG. 2(a) to (
e) is an operation waveform diagram of each part of the same as above, Fig. 3(a)t(b)
4 is a circuit diagram of the pulse wave detection section, FIG. 5 is a circuit diagram of the electrical skin resistance measurement section, and FIG. 6 is a diagram showing the pulse wave detection section. FIG. 7(a) is an explanatory diagram of the state in which the detection unit is used, and FIG. 1 is a light-emitting element, 2 is a light-receiving element, 3.6 is an electrode, and 7 is a lead wire Agent Patent Attorney Ishi 1) Chief 7 Figure 3 (b) 41st! ! ii 〉 〉 0℃
ΦFigure 5Figure 6Figure 7WJ (b)

Claims (3)

[Claims] (1) Arranging a light emitting element and a light receiving element close to a living body,
A pulse wave measuring means measures a pulse wave by receiving reflected waves or transmitted light by a living body of light irradiated from a light emitting element with a light receiving element, and a skin electrode is measured from a current flowing between electrodes attached to two places on the living body. A pulse wave measuring device characterized by integrally comprising a skin electrical resistance measuring means for measuring resistance. (2) Pulse wave measurement characterized in that body movement is detected by an electrical skin resistance measuring means, and the output of the electrical skin resistance measuring means is used to remove the output due to the body movement from the output of the pulse wave measuring means. Device. (3) Equipped with a separate signal processing device that measures the pulse wave from the output of each measuring means, and connecting the lead wire that connects the two electrodes of the electrical skin resistance measuring device to the signal processing device that measures the pulse wave from the output of each measuring means. 2. The pulse wave measuring device according to claim 1, which is used as an antenna for transmitting data.