JPH0586304U - Adhesive pad for optical biometric device - Google Patents

Abstract

(57) [Abstract] [Purpose] With a simple configuration, the light transmission / reception part of the photobiological measurement device is shielded from the outside. [Structure] The adhesive pad 32 is attached to the probe main body 31 having the light transmitting / receiving units 12 and 15 in the photobiological measurement device. In this adhesive pad 32, the light transmitting / receiving unit 1
The portions corresponding to 2 and 15 are transparent portions 32a,
The other portion is the light shielding portion 32b.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an adhesive pad, and more particularly to an adhesive pad that is attached to a probe having a light transmitting / receiving unit of an optical biometric device.

[0002]

[Prior Art]

 BACKGROUND ART An optical biometric device is widely used to irradiate a living body with light having a specific wavelength and measure transmitted light or reflected light to obtain living body 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 / receiving unit on the surface of a living body. The adhesive pad is usually made of a flexible soft material such as rubber, and the back surface is fixed to the probe and the front surface is adhered to the living body surface. There is also a sensor that integrates the light emitting and receiving sensors with the above materials.

Since the adhesive pad transmits light, it is usually composed of a transparent material or a translucent material such as milky white.

[0004]

[Problems to be solved by the device]

 Since the adhesive pad is made of a translucent material, light other than the light transmitting portion, that is, external light, easily enters the light receiving portion. In addition, the incident light from the light transmitting unit easily propagates through the adhesive pad and directly enters the light receiving unit. In such a case, it becomes difficult to accurately detect only the biological signal.

An object of the present invention is to prevent disturbance of the light transmitting / receiving unit by external light.

[0006]

[Means for Solving the Problems]

 The adhesive pad for an optical biometric device of the present invention is an adhesive pad for an optical biometric device that is attached to a probe having a light transmitting / receiving unit of the optical biometric device, and a portion corresponding to the optical transmitting / receiving unit is transparent. Yes, the other parts are light-shielding.

[0007]

[Action]

 In the adhesive pad for an optical biometric 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. The light transmitted or reflected from 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]

【Example】

 FIG. 1 shows an optical biometric device using the adhesive pad of the present invention. This device is a device for non-invasively measuring changes in hemoglobin in the human head and muscles, and includes a probe 2 for measuring at the forehead 1 and a monitor connected to the probe 2. It has a main body 3 and a personal computer 4 which receives data from the monitor main body 3 and stores data.

As shown in FIG. 2, since the three-wavelength absorbance calculation is performed in this embodiment, semiconductor lasers LD1 to LD3 having different wavelengths are provided in the apparatus, and the respective semiconductor lasers LD1 to LD3 are , And is connected to the light transmitting section 12 of the probe 2 via the laser module 10 and the optical fiber 11. The semiconductor lasers LD1 to LD3 each oscillate a laser beam of a specific wavelength (for example, 780 nm, 805 nm, 830 nm or 700 nm, 730 nm, 750 nm). Each output is, for example, 30 mW. The semiconductor lasers LD1 to LD3 are sequentially switched by a drive circuit 13 to be emitted. The 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 portion 15 made of a silicon photodiode. The light receiving section 15 is provided with a preamplifier 16, and the output from the preamplifier 16 is connected to a sample hold circuit 18 via a cable 17. The output of the sample hold circuit 18 is input to the control unit 14 via the main amplifier 19 and the V / F converter 20.

An I / O port 21 is connected to the control unit 14. A key panel 22 and an LCD 23 provided on the front surface of the monitor body 3 are connected to the I / O port 21. Further, the personal computer 4 is connected to the I / O port 21. The control unit 14 controls the oscillation of the semiconductor lasers LD1 to LD3, calculates the time-dependent absorbance change amount based on the signal from the light receiving unit 15, and oxygenates the time-dependent absorbance change amount and the previously measured extinction coefficient. Calculate the variation of type hemoglobin and the variation of total hemoglobin. Further, the oxygen saturation is calculated based on it. The calculation result can be output to the personal computer 4.

Next, the probe 2 will be described. As shown in FIGS. 3 and 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 bonded 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 and is 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 side, respectively.

The pad 32 is attached to the light-transmitting / receiving surfaces 12 a and 15 a of the probe body 31 in a detachable manner. 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, flexible semitransparent silicon rubber, 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 / receiving surfaces 12a and 15a. The light shielding portion 32b is provided on the outer peripheral side of the light transmitting portion 32a so as to shield light from the outside. The light shielding portion 32b is made of, for example, black silicon rubber, and has flexibility similar to the light transmitting portion 32a. A tongue portion 32c, which serves as a knob when the pad 32 is replaced, is formed at one end of the light shielding portion 32b.

Furthermore, an adhesive for removably fixing the pad 32 to the probe body 32 is applied to the surface of the pad 32 on the probe body 31 side. Moreover, the other surface of the pad 32 is coated with an adhesive for fixing the probe 2 to the surface of the living body. The adhesive force of the pad 32 on the side surface of the probe main body 11 is set higher than that of the other surface, so that when the probe 2 is handled, only the pad 32 does not remain attached to the surface of the living body. Before use, the pad 32 is covered with sticker paper (not shown) on both sides, and the sticker paper is peeled off before 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 sticker paper corresponding to the side of the probe main body 31 is peeled off from the pad 32, and the pad 32 is bonded to the main body 31 so that the light transmitting portion 32a is aligned with the light transmitting / receiving surfaces 12a and 15a. Then, the sticker paper on the other surface of the pad 32 is peeled off and 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 drive predetermined semiconductor lasers LD1 to LD3. To do. 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 unit 15 through the light transmitting unit 32a. In the light receiving unit 15, the voltage changes according to the intensity of the received light, and the measurement signal finally becomes the frequency and is supplied to the control unit 14. The control unit 14 calculates the hemoglobin amount fluctuation based on the measurement result of 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 32 b of the pad 32 shields light from the outside and also shields the laser light from the light-transmitting portion 12 that does not pass through the forehead 1 to 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 transparent portion 32b of the pad 32 shown in FIGS. 3 and 4 may be a simple hole instead of the semi-transparent silicone rubber. (B) Instead of the pads 32 shown in FIGS. 3 and 4, the pads 32 of FIG. 5 may be used. The pad 32 in FIG. 5 has a three-layer structure including a pair of light shielding layers 41 and 42 and a light transmitting layer 43 arranged between the light shielding layers 41 and 42. Here, holes 44 are provided in both the light shielding layers 41 and 42 at the positions corresponding to the light transmitting portion 12 and the light receiving portion 15, respectively. (C) The present invention can be implemented by the pad 32 shown in FIG. In this pad 32, one elongated light transmitting portion 32a is provided at a position corresponding to the light transmitting surface 12a and the light receiving surface 15a of the probe body 31. (D) Although laser light of three wavelengths is used in the above embodiment, laser light of four wavelengths or more may be used in order to improve measurement accuracy. (E) In the above-described embodiment, the probe main body 31 is provided with one pair of the light transmitting unit 12 and the light receiving unit 15, but two or more pairs may be provided.

[0018]

[Effect of the device]

 According to the adhesive pad for an optical biometric device according to the present invention, the portion corresponding to the light transmitting / receiving portion of the probe is transparent and the other portions are light shielding, so that it is possible to shield external light. , Accurate measurement can be performed.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of an optical biometric device to which an embodiment of the present invention is applied.

FIG. 2 is a schematic block diagram thereof.

FIG. 3 is a front view of the probe.

4 is a schematic cross-sectional view taken along the line IV-IV of FIG.

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 body 12 light transmitting section 15 light receiving section 31 probe body 32 pad 32a light transmitting section 32b light shielding section

Claims (1)

[Scope of utility model registration request] 1. An adhesive pad for a photobiological measuring device, which is attached to a probe having a light transmitting / receiving part of a photobiological measuring device, wherein a portion corresponding to the light transmitting / receiving part is translucent, and other portions are light shielding. An adhesive pad for an optical biometric device, characterized in that