JP2601665Y2 - Optical biological 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 an optical living body measuring apparatus, and more particularly to an optical living body measuring apparatus provided with a probe having a light transmitting / receiving section.

[0002]

2. Description of the Related Art Optical biometric devices are widely used to irradiate a living body with light of a specific wavelength and measure transmitted light or reflected light to obtain biological information. In an optical biometric device, an adhesive pad having an adhesive substance applied to the surface is used to fix a probe having a light transmitting and receiving unit to the surface of a living body. The adhesive pad is usually made of a flexible soft material such as rubber, and has a back surface fixed to the probe and a front surface adhered to the body surface. Further, there is also a sensor in which a light transmitting / receiving sensor is integrated with the above-mentioned material.

[0003] Since the adhesive pad transmits light, it is usually used.
It is made of a transparent material or a translucent material such as milky white.

[0004]

Since the adhesive pad is made of a light-transmitting material, light other than the light transmitting portion, that is, external light, easily enters the light receiving portion. Further, it is easy for incident light from the light transmitting unit to directly enter the light receiving unit via the adhesive pad. In such a case, it is difficult to accurately detect only the biological signal.

[0005] An object of the present invention is to prevent disturbance of the light transmitting and receiving unit by external light.

[0006]

An optical living body measuring apparatus according to the present invention is an optical living body measuring apparatus provided with a probe having a light transmitting / receiving section, and a portion corresponding to the light transmitting / receiving section is translucent. The other part is characterized in that a light-shielding adhesive pad is detachably adhered to the probe.

[0007]

In the optical living body measuring device of the present invention, light is emitted from the light transmitting portion of the probe toward the living body through the light transmitting portion of the adhesive pad detachably adhered to the probe. The light transmitted or reflected by the living body reaches the light receiving portion of the probe through the light transmitting portion. At this time, since the light-shielding portion of the pad prevents disturbance due to external light, accurate measurement can be performed.

[0008]

FIG. 1 shows an optical biometric device employing the adhesive pad of the present invention. This device is a device for non-invasively measuring a change in hemoglobin in a human head or muscle, and includes a probe 2 for performing measurement on a forehead 1 and a monitor main body 3 connected to the probe 2. And a personal computer 4 that receives output from the monitor main body 3 and stores data and the like.

As shown in FIG. 2, in this embodiment, since the three-wavelength absorbance calculation is performed, semiconductor lasers LD1 to LD3 having different wavelengths are provided in the apparatus. Module 10
And the light transmitting unit 12 of the probe 2 via the optical fiber 11
It is connected to the. Each of the semiconductor lasers LD1 to LD3 has a specific wavelength (for example, 780 nm, 805 nm, 83 nm).
(0 nm or 700 nm, 730 nm, 750 nm). Each output is, for example, 30 mW. The semiconductor lasers LD1 to LD3 are sequentially switched and transmitted by the drive circuit 13. Drive circuit 13
Is controlled by a control unit 14 including a microcomputer including a CPU and the like.

The probe 2 is provided with a light receiving section 15 made of a silicon photodiode. Light receiving unit 15
Is provided with a preamplifier 16.
Is connected to a sample and hold circuit 18 via a cable 17. Sample hold circuit 18
Is input to the control unit 14 via the main amplifier 19 and the V / F converter 20.

Further, an I / O port 21 is connected to the control unit 14. The I / O port 21 has a monitor body 3
Is connected to a key panel 22 provided on the front surface of the LCD. Further, the personal computer 4 is connected to the I / O port 21. In the control unit 14,
In addition to controlling the oscillation of the semiconductor lasers LD1 to LD3, the amount of change in absorbance with time is calculated based on the signal from the light receiving unit 15, and the amount of change in oxygenated hemoglobin is calculated based on the change in absorbance with time and the previously measured extinction coefficient. Calculate the variation of total hemoglobin. Further, the oxygen saturation is calculated based on the calculated value. The calculation result can be output to the personal computer 4.

Next, the probe 2 will be described. FIG.
4, the probe 2 includes a probe main body 31 in which the light transmitting unit 12 and the light receiving unit 15 are housed, and a pad 32 adhered to the probe main body 31. The probe main body 31 is a generally oval-shaped member, and is made of resin or the like to be relatively lightweight. In the probe main body 31, the light transmitting surface 12a of the light transmitting unit 12 and the light receiving surface 15a of the light receiving unit 15 are arranged toward the pad 32, respectively.

The pad 32 is detachably attached to the light transmitting and receiving surfaces 12a and 15a of the probe body 31. The pad 32 includes a light transmitting portion 32a, a light shielding portion 32b, and a tongue portion 32c. The light transmitting portion 32a is made of, for example, a translucent silicone rubber having flexibility, and is arranged at a position corresponding to the light transmitting surface 12a and the light receiving surface 15a. The light transmitting portion 32a has an outer dimension slightly larger than the light transmitting and receiving surfaces 12a and 15a. The light shielding portion 32b is provided on the outer peripheral side of the light transmitting portion 32a to block external light. The light shielding portion 32b is formed of, for example, black silicon rubber, and has flexibility like the light transmitting portion 32a. A tongue 32c serving as a knob when replacing the pad 32 is formed at one end of the light shielding portion 32b.

Further, an adhesive for removably fixing the pad 32 to the probe main body 32 is applied to the surface of the pad 32 on the probe main body 31 side. Also,
On the other surface of the pad 32, the probe 2
An adhesive is applied to fix the adhesive. Pad 32
The adhesive force on the side surface of the probe main body 11 is set higher than that on the other surface, so that only the pad 32 does not remain attached to the surface of the living body when the probe 2 is handled. The pad 32 is covered on both sides with seal paper (not shown) before use, and is used after peeling off the seal paper at the time of use.

Next, the operation of the above embodiment will be described. First, a new pad 32 is bonded to the main body 31 of the probe 2. At this time, the seal paper corresponding to the probe body 31 side is peeled off from the pad 32, and the light transmitting portion 32a is
The pad 32 is adhered to the main body 31 so as to correspond to a and 15a. Then, the seal paper on the other surface of the pad 32 is peeled off, and is brought into close contact with the forehead 1.

When a program (not shown) in the control unit 14 is started and a measurement start command is input via the key panel 22, the control unit 14 controls the drive circuit 13 to
The semiconductor lasers LD1 to LD3 are driven. The generated laser light reaches the forehead 1 from the light transmitting unit 12 through the light transmitting unit 32a. The transmitted light from the forehead 1 is received by the light receiving section 15 through the light transmitting section 32a. In the light receiving unit 15, the voltage changes according to the received light intensity, and the measurement signal is finally supplied to the control unit 14 as a frequency. The control unit 14 calculates the hemoglobin amount fluctuation based on the measurement result by the light receiving unit 15. The calculation result is output to the personal computer 4.

During the above-described measurement operation, the light shielding portion 32b of the pad 32 blocks external light, and also blocks the laser light from the light transmitting portion 12 which does not pass through the forehead 1 from the light receiving portion 15. , Accurate measurement can be performed. As a result, the accuracy of the obtained hemoglobin fluctuation value and the like is improved. [Other Embodiments] (a) The light transmitting portion 3 of the pad 32 shown in FIGS. 3 and 4
2b may not be made of translucent silicon rubber but may be a simple hole. (B) Instead of the pad 32 shown in FIGS. 3 and 4,
The pad 32 of FIG. 5 may be used. Pad 32 of FIG.
Is a pair of light shielding layers 41 and 42 and the light shielding layers 41 and 42
It has a three-layer structure consisting of a light-transmitting layer 43 disposed therebetween. Here, holes 44 are provided in both the light shielding layers 41 and 42 at positions corresponding to the light transmitting unit 12 and the light receiving unit 15, respectively. (C) The present invention can be implemented by the pad 32 shown in FIG. In the pad 32, one elongated hole-shaped light transmitting portion 32 a is provided at a position corresponding to the light transmitting surface 12 a and the light receiving surface 15 a of the probe main body 31. (D) In the above embodiment, laser light of three wavelengths is used, but laser light of four or more wavelengths may be used in order to increase measurement accuracy. (E) In the above embodiment, the light transmitting unit 1 is
Although two pairs and two light receiving units 15 are provided, two or more pairs may be provided.

[0018]

[Effect of the Invention] According to the optical living body measuring device according to the present invention,
The light-transmitting part corresponding to the probe's light-transmitting / receiving part is translucent, and the other part is light-shielding. The adhesive pad is detachably adhered, so that external light can be shielded and accurate measurement can be performed. Can be. Further, since the adhesive pad is adhered to the probe, it is possible to prevent only the pad from remaining on the surface of the living body.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of an optical living body measuring apparatus employing an embodiment of the present invention.

FIG. 2 is a schematic block diagram thereof.

FIG. 3 is a front view of the probe.

FIG. 4 is a schematic sectional view taken along the line IV-IV in FIG. 3;

FIG. 5 is a perspective view showing another embodiment.

FIG. 6 is a perspective view showing still another embodiment.

[Explanation of symbols]

 2 Probe 3 Monitor main body 12 Light transmitting section 15 Light receiving section 31 Probe main body 32 Pad 32a Light transmitting section 32b Light shielding section

Claims (1)

(57) [Scope of request for utility model registration] 1. An optical biometric device provided with a probe having a light transmitting and receiving unit, wherein a portion corresponding to the light transmitting and receiving unit is translucent, and the other part is a light-shielding adhesive pad. An optical biometric device, which is detachably adhered to a probe.