JP2018029784A - Skin state detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a skin state detection device capable of performing accurate follow-up observation by directly observing a state of an affected part from above a protection sheet attached to the skin of an affected part such as a bedsore and correcting optical characteristics of the protection sheet.SOLUTION: A skin state detection device for detecting a state of the skin through a protection sheet attached to the skin of a subject includes a light source 4 for irradiating a white light onto the protection sheet 200 or the skin 100, a detection part 5 for detecting reflected light intensities of respective wavelength bands of red, green, and blue colors reflected by the protection sheet 200 or the skin 100, and a control part 10 for correcting the reflected light intensities of the respective wavelength bands of red, green, and blue colors based on a difference between the reflected light intensity of the white light from the skin to which the protection sheet 200 is attached, and the reflected light intensity of the white light from the skin, and determining the state of the skin.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a skin condition detection device for detecting a skin condition via a protective sheet affixed to the skin of a subject.

As the population ages, more patients need long-term treatment. When these patients are bedridden with the same posture, there is a problem of causing bedsores in surrounding tissues that have become inadequate due to pressure at the contact area between the body and a support surface (mostly a bed).
This bed slip starts from the initial redness, and if left untreated, there is a risk that it will worsen in a short period of time, such as a tissue defect. Therefore, it is necessary to recognize and treat bed slippage at the initial stage of redness.

However, it is difficult to recognize bedsores at the early stage of redness. Currently, when a caregiver or nurse notices a patient's redness, the color change of the glass plate or finger press confirms whether the bedsore is out of bed. .
There are individual differences in skin color, and it is the actual situation that judgment of redness of the initial skin is made by experienced persons such as doctors and nurses. However, in many cases, the family is caring at home or the like, and it is difficult for a non-experienced person like the family to judge, and the initial redness may be missed and worsened.

In addition, as a countermeasure after finding a bed slip, a protective sheet is attached to the skin of the found bed slip portion to relieve pressure on the skin contact area, and the recovery process of the bed slip portion is observed.
In this follow-up observation, if the protective sheet is peeled off and observed, the patient is painful due to the peeling of the protective sheet, and there is also a risk of exacerbating the bed slip portion. Therefore, it is desirable to observe without removing the protective sheet.

Therefore, in the follow-up observation, the floor slip part is observed after the protective sheet is applied, but since it is originally a subjective color judgment, not only the inexperienced family members, but also the doctors in the judgment over the protective sheet Even experienced people such as nurses and nurses will be difficult.
Furthermore, there are a plurality of types of protective sheets to be prescribed, which have different light transmission characteristics, and it is difficult to grasp the redness change of the skin due to the difference in gloss of the surface and the unevenness of the surface depending on how it is applied.

As a conventional technique for optically observing the floor slip, there is Patent Document 1, and the floor slip detection apparatus described in Patent Document 1 will be described below.
The bed slip detection device described in Patent Document 1 includes a first detection means having one or a plurality of moisture sensors for detecting the amount of moisture by pressing the detection surface against the skin of the body, and pressing the detection surface against the skin. The second detection means provided separately from the first detection means for detecting the amount of water by being applied, the moisture amount obtained by the first detection means, and the moisture obtained by the second detection means Based on the difference from the amount, the determination means for determining the degree of bed slippage risk that the portion where the detection surface of the moisture sensor included in the first detection means is pressed may be floor slip, and the determination result of the determination means A display device for displaying is provided. Then, bed slippage is determined based on the difference between the moisture content of the bed slippage site obtained by the first detection means and the moisture content of the comparative skin obtained by the second detection means.

  Moreover, although it is not the observation of bed slip, in Patent Document 2, as a contact allergy test sheet, a test sheet in which an allergen is placed on a transparent sheet is attached to the skin, and an optical test is performed on the transparent sheet. Techniques for directly detecting skin color changes by techniques are described.

Japanese Patent No. 5922457 (first page, FIG. 1) JP 2001-55346 A (first page)

The conventional example shown in Patent Document 1 is a bed slip detection device common to the present invention, but detects the amount of water by directly pressing the detection surface against the floor slip location of the skin. Therefore, when the protective sheet is attached to the place where the floor slips on the skin, the protective sheet is peeled off and the measurement is performed, which gives the patient the pain of removing the protective sheet.
The prior art disclosed in Patent Document 2 is not related to a bed slip detection device, and a specific method for optically detecting skin color regardless of the presence or absence of a translucent sheet attached to the skin is specific. Is not listed.

  The object of the present invention is to observe the state of the affected part directly from the top of the protective sheet attached to the affected part of the skin, such as bedsores, and correct the optical characteristics of the protective sheet to enable accurate follow-up observation. It is to provide a detection device.

  In order to achieve the above object, the configuration of the skin condition detection device according to the present invention is a skin condition detection device for detecting a skin condition via a protection sheet affixed to the skin of a subject, the protection sheet or the skin A light source for irradiating white light on the skin, a detection sheet for detecting the intensity of reflected light in each of the red, green and blue wavelength bands reflected by the protective sheet or skin, and white light from the skin with the protective sheet attached A controller that determines the skin condition by correcting the reflected light intensity of each of the red, green, and blue wavelength bands based on the difference between the reflected light intensity of the white light and the reflected light intensity of the white light from the skin, It is characterized by having.

  According to the above configuration, in the skin state detection device that observes the progress of the affected part by comparing the reflected light from the affected part to which the skin and the protective sheet are attached, the red, green, and blue colors from the affected part to which the protective sheet is attached By adding correction based on the optical characteristics of the protective sheet to the reflected light in each wavelength band, accurate skin condition detection can be performed.

  The reflected light intensity of the white light from the skin to which the protective sheet is applied and the reflected light intensity of the white light from the skin may be the sum of the reflected light intensities in the red, green, and blue wavelength bands.

  You may have a white light detection part for detecting the reflected light intensity of white light.

  According to the said structure, since accurate white light can be detected, the presence or absence of a protection sheet and the optical correction value of a protection sheet can be calculated accurately.

  The control unit may correct the reflected light intensity in each of the red, green, and blue wavelength bands using a value obtained by dividing the difference into three equal parts.

  According to the said structure, based on the correction value of the detected protection sheet, the reflected light component of each wavelength band of red, green, and blue can be correct | amended correctly.

As described above, the skin condition detection device of the present invention is a skin condition detection device that observes the progress of an affected area by comparing the reflected light from the affected area to which the skin and the protection sheet are applied. By applying correction based on the optical characteristics of the protective sheet to the reflected light in the red, green, and blue wavelength bands, the accurate skin condition can be detected.

It is a perspective view which shows the skin state detection apparatus in 1st Embodiment of this invention. It is a fragmentary sectional view which shows the AA cross section in the skin state detection apparatus shown in FIG. It is a fragmentary sectional view which shows the AA cross section in the modification of the skin state detection apparatus shown in FIG. It is a block diagram which shows the circuit structure of the skin state detection apparatus in 1st Embodiment of this invention. It is a schematic diagram which shows the usage example of the skin state detection apparatus in 1st Embodiment of this invention. It is a schematic diagram which shows the usage example of the skin state detection apparatus in 1st Embodiment of this invention. It is a schematic diagram explaining the optical operation | movement with the light source and detection part in 1st Embodiment of this invention. It is a schematic diagram explaining the optical operation | movement with the light source and detection part in 1st Embodiment of this invention. It is a flowchart explaining operation | movement of the skin state detection apparatus in 1st Embodiment of this invention. It is a table | surface explaining operation | movement of the skin state detection apparatus in 1st Embodiment of this invention. It is a table | surface explaining operation | movement of the skin state detection apparatus in 1st Embodiment of this invention. It is a graph explaining operation | movement of the skin state detection apparatus in 1st Embodiment of this invention. It is a graph explaining operation | movement of the skin state detection apparatus in 1st Embodiment of this invention. It is a graph explaining operation | movement of the skin state detection apparatus in 1st Embodiment of this invention. It is a graph explaining operation | movement of the skin state detection apparatus in 1st Embodiment of this invention. It is a perspective view which shows the skin state detection apparatus in 2nd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the embodiment described below exemplifies a skin condition detection device for embodying the idea of the present invention, and the present invention is not limited to the following configuration. In particular, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in the embodiments are not intended to limit the scope of the present invention only to specific examples unless otherwise specified. Not too much. In the following description, the same parts and the same components are denoted by the same names and reference numerals, and detailed description may be omitted as appropriate.
Further, in the description of the following embodiment, a skin state detection device that observes the skin state of bed slip will be described as an example.

[First Embodiment]
A skin condition detection apparatus according to a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a perspective view showing the configuration of the skin condition detection device of the first embodiment. 2A is a partial cross-sectional view showing a cross section AA in the skin condition detection device shown in FIG. 1, FIG. 2B is a partial cross-sectional view showing a cross section AA in a modification of the skin condition detection device shown in FIG. FIG. 2 is a block diagram showing a circuit configuration of the skin condition detection device shown in FIG. 1.

[Description of Configuration of First Embodiment]
The skin condition detection apparatus 1 shown in FIG. 1 has a measurement unit 3 provided on the front surface of a rectangular case 2, and the configuration of the measurement unit 3 includes a light source 4 and a detection unit 5 for irradiation. A contact member 6 made of an elastic body is provided.
Further, a switch 7 for controlling the measurement operation of the skin state detection device 1 and a display unit 8 for displaying the measurement result of the skin state detection device 1 are provided on the upper surface of the case 2.
As will be described later, a battery for power supply, a measurement circuit, and the like are built in the case 2 of the skin condition detection device 1.

2A is a partial cross-sectional view showing the AA cross section of the skin condition detection device 1 shown in FIG. 1, and the detection unit 5 is a red light sensor 5r for detecting red light (hereinafter referred to as “R sensor 5r”), It has a green light sensor 5g (hereinafter referred to as “G sensor 5g”) and a blue light sensor 5b (hereinafter referred to as “B sensor 5b”). A green component G and a blue component B are detected. The periphery of the R sensor 5r, G sensor 5g, and B sensor 5b constituting the light source 4 and the detection unit 5 is covered with a black contact member 6, and the optical detection operation between the light source 4 and the detection unit 5 is performed. Prevents external light from entering.
Furthermore, the measurement part 3 comes into close contact with the skin of the human body due to the flexibility of the frame-shaped part 6 a provided at the tip of the contact member 6.

In the skin condition detection device 1, the reflected light intensity of the white light emitted from the light source 4 reflected by the skin or the protective sheet is detected by the R sensor 5r, G sensor 5g, and B sensor 5b that constitute the detection unit 5. , Red component R, green component G, and blue component B are detected. At this time, the white component W obtained by adding the reflected light intensities of the red component R, the green component G, and the blue component B may be detected as the reflected light intensity.
When detecting as the reflected light intensity of the white component W, as a modified example, as shown in FIG. 2B, the detection unit 5 is further provided with a white light sensor 5w (hereinafter referred to as “W sensor 5w”) as a white light detection unit, The white component W may be directly detected by the W sensor 5w.
According to the configuration of FIG. 2B, the number of sensors is increased by one, but is directly detected by the W sensor 5w from the white component W obtained by adding the three color lights detected by the R sensor 5r, the G sensor 5g, and the B sensor 5b shown in FIG. 2A. The detection accuracy of the reflected light intensity of the white component W is high, which is advantageous for the operation of detecting the skin condition.

[Description of circuit configuration of skin condition detection device]
Next, the circuit configuration of the skin condition detection device 1 will be described with reference to FIG.
FIG. 3 is a block diagram illustrating a circuit configuration of the skin condition detection device 1, which includes a control unit 10 built in the case 2 in addition to the measurement unit 3, the measurement switch 7, and the display unit 8.
The control unit 10 includes a switch number determination unit 11 that determines the number of operations of the measurement switch 7, a control circuit 12 that receives signals from the switch number determination unit 11 and outputs various control signals, and a control signal from the control circuit 12. In response, detection light from the R sensor 5r, G sensor 5g, and B sensor 5b constituting the detection unit 5 of the measurement unit 3 is input, and a red component R (hereinafter referred to as “R value”) that is an optical signal is input. ), A green component G (hereinafter referred to as “G value”), a blue component B (hereinafter referred to as “B value”), and a white component obtained by synthesizing the R value, G value, and B value. The optical signal processing unit 13 calculates W (hereinafter referred to as “W value”), and the determination circuit unit 14 performs various determination operations according to each optical signal from the optical signal processing unit 13.

Further, the determination circuit unit 14 detects the detection light signal Phc (R value, G value, B value) from the optical signal processing unit 13 and the total light signal Pha (R value, G value, B value) calculated from the detection light signal Phc. Storage unit 15 that stores the total light signal Pha from the storage unit 15 to determine whether there is a protective sheet, and from the protective sheet determination unit 16 that there is a protective sheet. The signal Sa, the correction coefficient calculation unit 17 that calculates the correction coefficient α in response to the optical characteristic value by the protective sheet, and the detection light signal Phc1 (R1 value, G1 value, B1 value) supplied from the storage unit 15,
A correction unit 18 that generates a detection light signal Phc2 (R2, G2, and B2 values) corrected by the correction coefficient α supplied from the correction coefficient calculation unit 17, and a detection light signal Phc2 supplied from the correction unit 18 are stored in advance. It has a skin condition determination unit 19 that determines whether or not the bed slips in comparison with the set reference value.

  In the above description, an example in which the detection unit 5 includes the R sensor 5r, the G sensor 5g, and the B sensor 5b has been described. However, a W sensor 5w is further provided as a white light detection unit, and the white component W is directly generated by the W sensor 5w. Detection may be performed. In that case, the process of calculating the W value by adding the R value, the G value, and the B value in the optical signal processing unit 13 becomes unnecessary.

  In FIG. 3, the configuration example in which the information on the reflected light intensity detected by the detection unit 5 is stored in the storage unit 15 via the optical signal processing unit 13 is shown. However, the optical signal processing unit 13 without the storage unit 15 is provided. A configuration in which the detection light signal Phc and the total light signal Pha are directly supplied to the protective sheet determination unit 16, the correction unit 18, and the floor displacement determination unit 19 may be employed.

[Explanation of operation method and principle of skin condition detection device]
Next, an operation method and an operation principle of the skin state detection device 1 will be described with reference to FIGS. 4A to 5B. 4A and 4B are schematic views showing a state in which the measurement unit 3 of the skin state detection device 1 is pressed against the skin of the subject to perform a detection operation, and FIG. 4A is applied to the non-compression unit 103 of the skin without the protective sheet 200. FIG. 4B shows the reference skin color measurement state in which the measurement unit 3 of the skin condition detection device 1 is pressed, and FIG. 4B presses the measurement unit 3 of the skin condition detection device 1 against the skin compression unit 102 to which the protective sheet 200 is applied. The target skin color measurement state is shown. 5A and 5B are schematic diagrams showing light detection operations of the light source 4 and the detection unit 5 in the reference skin color measurement state and the target skin color measurement state shown in FIGS. 4A and 4B.

In FIG. 4A to FIG. 5B, a protective sheet 200 is attached to the reddish portion 101 due to the bed slippage of the skin 100 to protect the reddish portion 101. The portion of the skin 100 where the protective sheet 200 is attached is the compression portion 102, and the portion where the protective sheet 200 is not attached is the non-compressed portion 103.
4A shows a reference skin color measurement state in which the measurement unit 3 of the skin condition detection device 1 is pressed against the non-pressing part 103 where the protective sheet 200 is not attached, and FIG. 4B shows the measurement of the skin condition detection device 1. The target skin color measurement state is shown in which the part 3 is pressed against the compression part 102 to which the protective sheet 200 is attached.
In a state where the measurement unit 3 of the skin condition detection device 1 is pressed against the skin 100 or the protective sheet 200, the measurement unit 3 is protected by the flexibility of the frame-shaped unit 6 a provided at the tip of the contact member 6. It is in close contact with the sheet 200.

  5A and 5B are schematic diagrams illustrating optical operations of the light source 4 and the detection unit 5 in a state in which the measurement unit 3 of the skin state detection device 1 is pressed against the skin of the subject to perform the detection operation. 5A corresponds to the reference skin color measurement state shown in FIG. 4A, and FIG. 5B corresponds to the target skin color measurement state shown in FIG. 4B.

That is, in the reference skin color measurement state of FIG. 5A, all the light rays P1 emitted from the light source 4 are reflected by the non-pressing portion 103 of the skin 100 and received by the detection portion 5 as reflected light P2.
In the target skin color measurement state of FIG. 5B, most of the light rays P1 emitted from the light source 4 are reflected by the surface of the protective sheet 200 and received by the detection unit 5 as reflected light P3 (shown by dotted lines). A part of the light beam P1 passes through the protective sheet 200, is reflected by the compression part 102 of the skin 100, and is received by the detection part 5 as reflected light P4.

As will be described later, in the target skin color measurement state shown in FIG. 5B, a component that is specularly reflected on the surface of the protective sheet 200 is included depending on the type and affixing of the protective sheet 200, thereby combining the reflected light P3 and the reflected light P4. The reflected light has a higher brightness of R value, G value, and B value than the reflected light P2 in the reference skin color measurement state shown in FIG. 5A.

Next, with reference to the schematic diagrams shown in FIGS. 4A to 5B, an operation example of the skin condition detection device 1 will be described according to the circuit configuration diagram shown in FIG.
First, when the skin condition detection device 1 is set to the reference skin color measurement state shown in FIG. 4A and the measurement switch 7 is operated once, a first operation signal is output from the switch number determination unit 11 and this first operation is performed. In response to the signal, the control circuit 12 enters the reference skin color measurement mode and controls the measurement unit 3 and the optical signal processing unit 13 to the reference skin color measurement state.
As a result, the light source 4 constituting the measurement unit 3 repeats the light emission operation 10 times, and the R sensor 5r, G sensor 5g, and B sensor 5b constituting the detection unit 5 each have 10 Rt values as reference value signals, The Gt value and the Bt value are received and supplied to the optical signal processing unit 13.

  When the optical signal processing unit 13 is supplied with 10 Rt values, Gt values, and Bt values, the optical signal processing unit 13 calculates an Rt value, a Gt value, and a Bt value obtained by averaging 10 data. Further, a Wt value obtained by adding the averaged Rt value, Gt value, and Bt value is calculated, and the calculated Wt value is used as the reference total light signal Pha0 and the averaged Rt value, Gt value, and Bt value are calculated. The reference value detection light signal Phc0 is stored in the storage unit 15.

Next, when the skin state detection device 1 is set to the target skin color measurement state shown in FIG. 4B and the measurement switch 7 is operated once, a second operation signal is output from the switch number determination unit 11, and this second time In response to the operation signal, the control circuit 12 enters the target skin color measurement mode, and controls the measurement unit 3 and the optical signal processing unit 13 to the target skin color measurement state.
As a result, the light source 4 constituting the measurement unit 3 repeats the light emission operation 10 times, and the R sensor 5r, G sensor 5g, and B sensor 5b constituting the detection unit 5 each have ten R values as measurement value signals, The G value and the B value are received and supplied to the optical signal processing unit 13.

  When 10 R values, G values, and B values are supplied, the optical signal processing unit 13 calculates an R value, a G value, and a B value obtained by averaging 10 pieces of data. Further, a W value obtained by adding the averaged R value, G value, and B value is calculated, and the calculated W value is supplied to the storage unit 15 as a total optical signal Pha1 of the measurement value, and the averaged R value is calculated. The G value and the B value are stored in the storage unit 15 as the detection light signal Phc1 (R1 value, G1 value, B1 value) of the measurement value.

The storage unit 15 supplies the stored data to the protective sheet determination unit 16 when all the stored data of the reference value integrated optical signal Pha0 and the measured value integrated optical signal Pha1 are prepared. The protection sheet determination unit 16 calculates Pha1−Pha0 = ΔW from the supplied data.
This ΔW is the difference between the amount of reflected light from the non-compressed portion 103 of the skin 100 and the protective sheet 200. If this reflected light amount difference ΔW is greater than a predetermined comparison value M, it is determined that there is a protective sheet at the measurement location. If the reflected light amount difference ΔW is smaller than the predetermined comparison value M, it is determined that there is no protective sheet at the measurement location. When the protection sheet is present, the reflected light amount difference ΔW is supplied to the correction coefficient calculation unit 17 together with the protection sheet presence signal Sa. When the protection sheet is not present, the protection sheet absence signal Sn is supplied to the correction unit 18. To do.

The correction coefficient calculator 17 supplied with the protection sheet presence signal Sa and the reflected light amount difference ΔW calculates the correction coefficient α. The correction coefficient α is a value obtained by dividing the reflected light amount difference ΔW into R, G, and B, and is calculated by α = ΔW / 3, and the correction coefficient α is supplied to the correction unit 18.
The correction unit 18 supplied with the correction coefficient α adds the correction coefficient α to each R1 value, G1 value, and B1 value of the detection light signal Phc1 (R1 value, G1 value, B1 value) supplied from the storage unit 15. The corrected detection light signal Phc2 (R2 value, G2 value, B2 value) is supplied to the bed displacement determination unit 19.
When the protection sheet determination unit 16 determines that there is no protection sheet and the protection sheet absence signal Sn is supplied to the correction unit 18, the correction unit 18 does not perform the correction operation and stores the detected light. The data of the signal Phc1 is supplied as it is to the bed displacement determination unit 19 as a detection light signal Phc2 (R2 value, G2 value, B2 value).

  The floor displacement determination unit 19 supplied with the detection light signal Phc2 (R2, G2, B2 value) from the correction unit 18 compares each R2, G2, and B2 value with a preset reference value X, and R2 If any one of the value, the G2 value, and the B2 value is larger than the reference value X, it is determined that the floor slip has occurred, and the floor slip display and the color of the floor slip portion are displayed on the display unit 8.

  When detecting only redness of the initial symptoms of bedsores, the red color becomes stronger, so it is possible to determine the bedsores using only the R2 value, or to determine the skin condition in which the symptoms of bedsore progressed and became reddish black Can also determine the skin condition using the R2 value and the B2 value. It is also possible to determine a plurality of symptoms in detail by setting the reference value X for each of the R2 value, G2 value, and B2 value, and combining the results of comparison with the reference value X for each color component.

  When the W sensor 5w that is a white light detection unit is provided in the detection unit 5 and the white component W is directly detected by the W sensor 5w, the optical signal processing unit 13 outputs the total optical signal Pha0 and the total optical signal Pha1. Rather than calculating the Wt value or W from the averaged Rt value, Gt value, Bt value or the averaged R value, G value, B value, 10 Wt values detected by the W sensor 5w or The W value is averaged, and the averaged Wt value and the W value are supplied to the storage unit 15 as Pha0 and Pha1, and the protection sheet determination unit 16 calculates ΔW using the Pha0 and Pha1 to determine the presence or absence of the protection sheet. Do.

  The W sensor 5w for detecting white light is provided in the measurement unit 3 to directly detect white light. The R sensor 5r, G sensor 5g, and B sensor 5b shown in FIG. It is superior in characteristics compared to the method of measuring and adding individually. The reason is that the R sensor 5r, the G sensor 5g, and the B sensor 5b have different characteristic values, and the detected R value, G value, and B value are slightly different from the true values. Is a value slightly deviated from the W value directly measured by the W sensor 5w.

  As described above, the configuration of the modified example of the skin state detection device 1 shown in FIG. 2B increases the W sensor 5w by one, but the accuracy of the detected white light is increased, and the overall measurement accuracy is increased. Has the effect of increasing.

[Explanation of Flowchart Showing Operation of Skin Condition Detection Device]
Next, the operation flow of the skin condition detection device 1 will be described with reference to the flowchart shown in FIG. This flowchart is also performed with reference to the circuit configuration diagram shown in FIG. 3 and the schematic diagrams shown in FIGS. 4A and 4B.
Step S <b> 1 is a measurement start mode in which power is supplied to the skin condition detection device 1. Step S <b> 2 is a reference skin color measurement mode, in which the skin condition detection device 1 shown in FIG. 4A is applied to the non-pressing portion 103 of the skin 100 and the measurement switch 7 is operated. Step S3 is a reference skin color value detection mode in which the optical signal processing unit 13 averages 10 Rt values, Gt values, and Bt values respectively supplied from the R sensor 5r, the G sensor 5g, and the B sensor 5b. An Rt value, a Gt value, and a Bt value obtained by averaging 10 pieces of data are calculated. Further, a Wt value obtained by adding the averaged Rt value, Gt value, and Bt value is calculated, and the calculated Wt value is used as the reference total light signal Pha0 and the averaged Rt value, Gt value, and Bt value are calculated. The reference detection light signal Phc0 is supplied to the storage unit 15 and stored therein.

Step S4 is a target skin color measurement mode, in which the skin state detection device 1 shown in FIG. 4B is applied to the compression part 103 with the protective sheet 200 applied to the skin 100 and the measurement switch 7 is operated. Step S5 is a target skin color value detection mode in which the optical signal processing unit 13 averages 10 R values, G values, and B supplied from the R sensor 5r, G sensor 5g, and B sensor 5b, respectively. An R value, a G value, and a B value obtained by averaging the pieces of data are calculated. Further, a W value obtained by adding the averaged R value, G value, and B value is calculated, and the calculated W value is used as a total optical signal Pha1 as a measurement value, and the averaged R value, G value, and B value are calculated. The detection light signal Phc1 of the measured value is supplied to the storage unit 15 and stored.

  Step 6 is a protection sheet presence / absence determination mode, in which the sheet determination unit 16 calculates a light amount difference ΔW based on the reference value Pha0 (W0) and the measurement value Pha1 (W1) stored in the storage unit 15, and the protection sheet. Judgment of the presence or absence of. As an example, when it is assumed that the amount of reflected light from the protective sheet 200 is 5 times or more than the reflected light from the non-compressed portion 103 of the skin as a reference, the specific value H is set to 5. The presence / absence of the protective sheet is determined by “W1−W0 = ΔW> 5”. If ΔW> 5 (YES), it is determined that there is a protective sheet, and a light amount difference ΔW is supplied to the correction coefficient calculator 17 together with the protective sheet presence signal Sa.

  Step S7 is a correction value calculation mode, and the correction value calculation unit 17 starts the operation in response to the protection sheet presence signal Sa supplied from the protection sheet determination unit 16, and changes the light amount difference ΔW to three colors of R, G, and B. A correction value α for correcting each is calculated. That is, the calculation formula of the correction value α is α = ΔW / 3 below.

  Step S8 is a correction processing mode, in which the correction unit 18 is corrected by adding the correction value α to the detection light signal Phc1 (R1 value, G1 value, B1 value) of the measurement value supplied from the storage unit 15. Phc2 (R2 value, G2 value, B2 value) is created. That is, the calculation formula for the correction process is as follows. {R2 = R1-α, G2 = G1-α, B2 = B1-α}.

  Step S9 is a mode without correction processing, and in the determination of step S6, when it is determined that there is no protective sheet, the correction unit 18 supplied with the protective sheet absence signal Sn is a detection value detection light signal supplied from the storage unit 15. The detection light signal Phc2 (R2 value, G2 value, B2 value) is corrected without correcting the Phc1 (R1 value, G1 value, B1 value).

The correction unit 18 supplies the corrected detection light signal Phc2 (R2 value, G2 value, B2 value) to the floor displacement determination unit 19 regardless of whether the protection sheet presence signal Sa or the protection sheet absence signal Sn is received. Of these corrected detection light signal Phc2 data, the data based on the protective sheet presence signal Sa is data measured through the protective sheet as the object of the present invention, and the data based on the no protective sheet signal Sn is the floor slip. It is the data measured when it respond | corresponds without attaching a protective sheet to the affected part of this.
In other words, the skin condition detection device 1 according to the present invention can be used both when the protection sheet is used and when the protection sheet is not used.

  Step S10 is a skin color difference calculation mode, and the bed slippage determination unit 19 detects the reference value detection light signal Phc0 supplied from the storage unit 15 and the corrected detection light signal Phc2 (R2 value, G2 value supplied from the correction unit 18). , B2 value), skin color differences ΔR, ΔG, ΔB for each of R, G, B are calculated. The calculation formula is ΔR = R2-R0, ΔG = G2-G0, and ΔB = B2-B0.

Step S11 is a bed slippage determination mode, and the bed slippage determination unit 19 compares the calculated skin color differences ΔR, ΔG, ΔB with a predetermined reference value X, and even one of the skin color differences ΔR, ΔG, ΔB is determined based on the specific value X. If it is larger, it is determined that the bed is slipped. Then, the display unit 8 displays whether or not there is a bed slip and displays a skin color larger than the specific value X. Further, if all of the skin color differences ΔR, ΔG, ΔB are smaller than the specific value X, the display unit 8 displays that there is no floor slip.

Next, using FIG. 7A and FIG. 7B, the operation based on the flowchart of FIG. 6 will be described as a determination example using actual measured values.
FIG. 7A is a table showing an example of measured values at each step when the skin of the subject's bed slip is protected with a protective sheet.
In FIG. 7A, step S3 is the reference skin color value detection mode in FIG. 6, which is a measurement value of the non-compressed portion 103 of the skin 100, and R0 = 21, G0 = 16, B0 = 11. G0. W0 = 51 calculated from B0. The numerical values of the respective colors serve as reference values for determining the floor slip.

Step S5 is a target skin color value detection mode in FIG. 6, and is a measurement value of the compressed portion 102 where the protective sheet 200 is attached to the place of the floor of the skin 100, and R1 = 30, G1 = 20, and B1 = 13. Yes, W1 = 62 calculated from R1, G1, and B1.
The reason why the measured value in Step 5 is higher than that in Step 3 is that each reflected light is increased by the surface reflection of the protective sheet 200.
Step S6 is a protection sheet presence / absence determination mode, in which the amount of white light difference ΔW = W1−W0 = 62−51 = 11. Since the predetermined specific value H is 5, the light amount difference ΔW (11) is larger than the specific value H (5), so it is determined that there is a protective sheet.

Step S7 is a correction coefficient calculation mode in which the correction coefficient calculation unit 17 is supplied with the protection sheet presence signal Sa and the light amount difference ΔW (11) from the protection sheet determination unit 16, and calculates the correction coefficient α. The calculation formula of α is α = ΔW / 3 = 11/3 = 3.667.
Step S8 is a correction processing step. The correction unit 18 corrects the detected optical signal Phc1 (R1, G1, B1) supplied and stored from the optical signal processing unit 13 and supplied from the correction coefficient calculation unit 17. The detection light signal Phc2 (R2, G2, B2) is generated by correcting by adding a coefficient α = 3.667. The calculation formulas of the detection light signal Phc2 (R2, G2, B2) are R2 = R1-α = 30-3.667 = 26.3, G2 = G1-α = 20-3.667 = 16.3, B2. = B1- [alpha] = 13-3.667 = 9.3.

  Step S10 is a skin color difference calculation mode, in which the bed slip determination unit 19 detects the reference value detection light signal Phc0 (R0, G0, B0) supplied from the storage unit 15 and the detection light signal Phc2 (from the correction unit 18). The chromaticity difference of each color is obtained from the difference from R2, G2, B2). It should be noted that the skin color difference calculation formula is ΔR = R2-R0 = 26.3-21 = 5.3, ΔG = G2-G0 = 16.3-16 = 0.3, ΔB = B2-B0 = 9.3. 11 = -1.7.

  Step S11 is a floor slip determination step, and the floor slip determination unit 19 compares the chromaticity differences ΔR, ΔG, ΔB of each color of the obtained detection light signal Phc2 (R2, G2, B2) with predetermined specific values. It is determined whether or not. Since the specific value X is set to 5, when comparing the chromaticity differences ΔR = 5.3, ΔG = 0.3, and ΔB = −1.7 for each color with X = 5, ΔR (5.3) ≧ Since it is X (5), it is determined that the bed is slipped, the result is displayed on the display unit 8, and the skin condition detection measurement is terminated.

  Next, FIG. 7B is a table | surface which shows an example of the measured value in each step in case the skin of a test subject's bed slip location is not protected with a protective sheet. 7A and 7B compare the case where the protective sheet 200 is applied to the skin 100 of the subject having the same bed slip condition and the case where the protective sheet 200 is not applied. Further, in FIG. 7B, the same steps as in FIG. 7A have basically the same contents, and redundant description is omitted, and only the differences are described.

In FIG. 7B, step S3 is the same reference skin color value detection mode as step S3 of FIG. 7A. The measured values of the non-compressed portion 103 of the skin 100 are the same as R0 = 21, G0 = 16, B0 = 11, and W0 = 51 calculated from R0, G0, B0 is also the same.

  Step S5 is the target skin color value detection mode in FIG. 6 and is a measurement value of the non-compressed portion 103 where the protective sheet 200 is not attached to the place of the floor 100 of the skin 100, R1 = 26, G1 = 16, B1 = 10 is different from FIG. 7A. W1 = 52 calculated from R1, G1, and B1 is also different from FIG. 7A.

  Step S6 is a protective sheet presence / absence determination mode in which the light amount difference ΔW = W1−W0 = 52−51 = 1. Since the predetermined specific value H is set to 5, the light amount difference ΔW (1) is smaller than the specific value H (5), so it is determined that there is no protective sheet.

  Step S7 is a correction value calculation mode, but the correction coefficient α is not calculated because the correction coefficient calculation unit 17 is not supplied with the protection sheet presence signal Sa from the protection sheet determination unit 16. Then, the correction unit 18 is supplied with the protection sheet absence signal Sn from the protection sheet determination unit 16, thereby correcting the detection light signal Phc 1 (R 1, G 1, B 1) supplied from the storage unit 15 without detecting the detection light signal. The signal Phc2 (R2, G2, B2) is supplied to the bed displacement determination unit 19.

  Step S10 is a skin color difference calculation mode, in which the bed slip determination unit 19 detects the reference value detection light signal Phc0 (R0, G0, B0) supplied from the storage unit 15 and the detection light signal Phc2 supplied from the correction unit 18. The chromaticity difference of each color is obtained from the difference from (R2, G2, B2). The skin color difference calculation formula is ΔR = R2−R0 = 26−21 = 5, ΔG = G2−G0 = 16−16 = 0, ΔB = B2−B0 = 10− as in the case described with reference to FIG. 7A. 11 = -1.

  Step S11 is a floor slip determination step, and the floor slip determination unit 19 compares the chromaticity differences ΔR, ΔG, ΔB of each color of the obtained detection light signal Phc2 (R2, G2, B2) with predetermined specific values. It is determined whether or not. Since the specific value X is set to 5, the chromaticity differences ΔR = 5, ΔG = 0, and ΔB = −1 of the respective colors are compared with X = 5, and ΔR (5) ≧ X (5). Is determined. And the result is displayed on the display part 8, and skin state detection measurement is complete | finished.

Next, a case where the case where the protective sheet 200 is applied to the skin 100 of the subject having the same bed slip state shown in FIGS. 7A and 7B is compared with the case where the protective sheet 200 is not applied will be described. .
In the measurement mode of the target skin color in step S5, for example, with the protective sheet shown in FIG. 7A and without the protective sheet shown in FIG. 7B, for example, the total optical signal is W1 = 62 with the protective sheet. When there is no protective sheet, W1 = 52 is significantly different. However, the result of the skin color calculation in step S10 is that the color differences ΔR = shown in FIG. 7B are compared with the corrected color differences ΔR = 5.3, ΔG = 0.3, ΔB = 1.7 shown in FIG. 7A. 5, ΔG = 0, ΔB = 1, which are very approximate values. This indicates that sufficiently correct data can be obtained even when the progress measurement is performed in a state where the protective sheet 200 is attached to the place of the bed slip of the subject's skin 100.

Next, with reference to FIG. 8A to FIG. 8D, the relationship between the actual measurement value and the correction value in the case where the skin of the subject having no bed slip is protected with the protective sheet will be described. 8A and 8B and FIGS. 8C and 8D show measurement graphs for two subjects. 8A and 8C show actual measurement values (no correction), and FIGS. 8B and 8D show states when correction is performed. The horizontal axis indicates the measurement time, and the vertical axis indicates the amount of light (reflected light intensity) reflected by the skin 100 or the protective sheet 200 from the light source 4. The left half of the graph shows the amount of reflected light from the non-compressed portion 103 of the skin 100, the right half shows the amount of reflected light from the protective sheet, W represents the amount of white light, and R, G, and B represent the amounts of reflected light of color light. ing

The light quantity here is originally expressed in units of [μW / cm ² ], but in the graphs shown in FIG. 8A to FIG. 8D, the actual measurement value [μW / cm ² ] of the light quantity is A / D converted. , Numerical values [counts] represented by a dynamic range from 0 to 256 are shown.

8A and 8B show the measurement results of the subject A. In the actual measurement value graph shown in FIG. 8A, the white light quantity Wa in the portion without the protective sheet in the left half is 69.06, whereas the right half of the protection is shown. The white light amount Wb in the sheet 200 portion is as large as 74.67. R, G, and B are also increased by the influence of the white light amount Wb.
However, in the graph after correction shown in FIG. 8B, the amounts of R, G, and B in the portion without the protective sheet 200 and the portion with the protective sheet 200 are almost the same level as the influence of the protective sheet 200 is corrected. The amount of light.

8C and 8D show the measurement results of the subject B, and in the actual measurement value graph shown in FIG. 8C, the white light quantity Wa in the portion without the protective sheet 200 in the left front half is 67.38, whereas in the right half in the right half. The white light quantity Wb at the portion where the protective sheet 200 is present is as large as 76.97. R, G, and B are also affected by the white light amount Wb.
However, in the corrected graph shown in FIG. 8D, the R, G, and B light amounts in the portion without the protective sheet 200 and the portion with the protective sheet 200 are almost the same level as the influence of the protective sheet 200 is corrected. The amount of light.

  As described above, the effect of correcting the influence of the protective sheet 200 in the skin condition detection device of the present invention is also effective for two subjects who have different white light amounts Wa in a portion without the reference protective sheet. Without changing, it is possible to confirm the correct healing process even if the follow-up of the bed slip portion is performed with the protective sheet 200 attached.

  In the description of the first embodiment, white light from the light source 4 is applied to the skin 100 or the protective sheet 200, and the reflected light intensities of the reflected red, green, and blue wavelength bands are added together to reflect the white component W. Although an example in which the light intensity is detected and an example in which the white light sensor 5w is further provided and the reflected light intensity of the white component W is directly detected by the white light sensor 5w has been described, the skin 100 detected by the detection unit 5 is described. The difference in wavelength band between the reflected light intensity of the red component R, green component G, and blue component B reflected from the red light component R, green component G, and blue component B reflected from the protective sheet 200 It is also possible to correct the reflected light intensities of the red component R, the green component G, and the blue component B based on the above and to grasp the accurate color of the skin 100.

[Second Embodiment]
Next, a skin condition detection device 30 according to a second embodiment of the present invention will be described with reference to FIG.
FIG. 9 shows the configuration of the skin condition detection device 30 according to the second embodiment. The basic configuration of the skin condition detection device 30 is the same as that of the skin condition detection device 1 shown in FIG. And redundant description is omitted.

  The skin state detection device 30 differs from the skin state detection device 1 in that the skin state detection device 1 is configured as a whole, whereas the skin state detection device 30 is a part of the case 2 in the skin state detection device 1. Is a two-body configuration of a measurement probe 32 and a main body 31 connected to the probe 32 by a cord 33. The circuit portion provided in the skin state detection device 1 is provided in the main body 31, and the display unit 8 is provided on the surface of the main body 31 with a larger screen size.

  The skin state detection device 30 is operated by operating the power source on the main body 31 side to bring the skin state detection device 30 into an operating state, bringing the measurement unit 3 of the probe 32 into contact with the skin 100 of the subject, and operating the switch 7. Measurement can be performed and the measurement result can be confirmed on the display unit 8 of the main body 31 having a large screen size.

  In FIG. 9, the example in which the skin condition detection device 30 is connected to the measurement probe 32 and the main body 31 with the cord 33 has been described. However, instead of the cord 33, a general wireless communication unit may be used for wireless connection. You can also.

As described above, according to the present invention, the skin condition detection device enables accurate observation (recovery state) by the optical device in a state where the affected part of the skin is protected by the protection sheet, and gives pain to the subject due to peeling of the protection sheet. Treatment can continue.
In addition, although bed slip has been described as an application example of the skin condition detection device of the present invention, the present invention is not limited to this, and it is naturally applicable to diseases caused by general injuries, diseases caused by burns, and the like.

DESCRIPTION OF SYMBOLS 1, 30 Skin condition detection apparatus 2 Case 3 Measurement part 4 Light source 5 Detection part 5r R sensor 5g G sensor 5b B sensor 5w W sensor 6 Contact member 6a Frame shape part 7 Switch 8 Display part 10 Control part 11 Switch frequency determination part 12 Control circuit 13 Optical signal processing unit 14 Determination circuit unit 15 Storage unit 16 Protection sheet determination unit 17 Correction coefficient calculation unit 18 Correction unit 19 Bed slip determination unit 31 Body 32 Probe 33 Code 100 Skin 101 Redness part 102 Compression part 103 Non-compression part 200 Protective sheet

Claims (4)

A skin condition detection device for detecting the condition of the skin through a protective sheet affixed to the skin of a subject,
A light source for irradiating the protective sheet or the skin with white light;
A detection unit for detecting the reflected light intensity of each wavelength band of red, green, and blue reflected by the protective sheet or the skin;
Based on the difference between the reflected light intensity of the white light from the skin to which the protective sheet is applied and the reflected light intensity of the white light from the skin, the reflected light in each of the red, green, and blue wavelength bands And a control unit that determines the state of the skin by correcting the strength. The reflected light intensity of the white light from the skin to which the protective sheet is applied and the reflected light intensity of the white light from the skin are the sum of reflected light intensities of the red, green, and blue wavelength bands. The skin condition detection apparatus according to claim 1, wherein The skin condition detection device according to claim 1, further comprising a white light detection unit configured to detect a reflected light intensity of the white light. The said control part correct | amends the reflected light intensity | strength of each of the said red, green, and blue wavelength band using the value which divided the said difference into 3 equal parts, The Claim 1 characterized by the above-mentioned. Skin condition detection device.

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