System for measuring plurality of skin biophysics indexes

Abstract

The invention relates to a system for measuring a plurality of skin biophysics indexes, which comprises a suction device and a measuring device which are arranged in a split manner, and the suction device sucks skin secretions through a secreted substance transfer medium on the suction device; the measuring device forms mutual capacitance through the electrodes to measure skin components and / or measure capacitance parameters of skin secreted substances on the suction device, and the capacitance parameters comprise capacitance C1 which reflects a skin oil-water mixture and is obtained when the electrodes are configured to make contact with the skin at the first position through the insulating layer. The capacitance C2 is transferred by contacting the skin at the first position through the transfer medium and is obtained when the electrode is contacted with the transfer medium through the insulating layer; and the capacitance C3 is obtained by the transferred electrode at the first position and is used for reflecting the moisture content of the skin.

Description

Technical Field

[0001] The present invention relates to a system for measuring a plurality of skin biophysical indices, in particular to a method for the system to measure skin biophysical indices, wherein the skin biophysical indices include skin secretion substances and skin components. Background Art

[0002] The water content in the skin forms moisture moisturization, while the oil helps the skin to lock water and inhibit bacteria. The quantitative measurement of either water or oil is of great significance in dermatology or beauty.

[0003] Traditional methods for detecting skin oil mostly adopt the film measurement method. After the film absorbs the oil, optical comparison is carried out with a standard. For example, the microporous membrane disclosed in US Patent No. 4,532,937 is adhered to the skin to absorb sebum; US Patent No. 5,119,828 discloses the use of a microporous hydrophobic polymer membrane. When the pores are filled with gaseous materials, the membrane is opaque, and when the pores of the membrane are filled with sebum, the membrane becomes translucent, and this property is used for optical measurement; or German Patent DE29700324U1 discloses skin analysis and evaluation through a test membrane, etc. The film measurement method belongs to indirect measurement. The oil needs to be transferred to the test film before testing, and errors are easily introduced due to various uncertain factors during the transfer process.

[0004] Currently, the most commonly used device for detecting skin oil in the market is the CK device, which also uses an oil-absorbing paper + optoelectronic method. Each operation requires inserting the detection end into a component for calibration first, and then contacting the end with the area to be measured for 30 seconds and then inserting it back into another component for measurement. The operation is complex and the efficiency is low.

[0005] The unit for measuring oil is micrograms per square centimeter (ug / cm 2 )). The CK device can only distinguish the oil value content to a certain extent between 50 - 350 ug / cm 2 by the light transmittance of the oil-absorbing paper, and roughly divides different areas of the human body into three levels: less oil, normal, and more oil. The corresponding table is as follows:

[0006]

[0007] The characteristics of the oil-absorbing paper material itself and the area where the oil spreads on the oil-absorbing paper both affect the light transmittance. There are many influencing factors in the intermediate link of the corresponding relationship between the light transmittance of the oil-absorbing paper and the oil content, and relatively high requirements are imposed on the oil-absorbing paper (consumables), and a specified oil-absorbing paper is required. Therefore, whether it is traditional technology or the CK device, the measured values of the film + optical technical route cannot accurately establish a corresponding relationship with the oil content, the fuzzy range is relatively large, and there is no room for improvement in theory.

[0008] To solve the accuracy problem, our company earlier developed and disclosed in Patent 202310646526.6 a device for measuring skin secretion substances (such as oil / moisture). Instead of using optics, it measures the content of secretion substances by detecting the mutual capacitance between two electrodes on the detection head, then uses differential to remove the interference of the material of the blotting paper itself, and can achieve a relatively high level of detection sensitivity and accuracy in cooperation with a capacitance digital conversion circuit (CDC).

[0009] In the traditional method of detecting skin moisture, the corneal tonometer of CK proposed a direct measurement method. The principle is also that the mutual capacitance electric field formed by two electrodes penetrates the human skin, senses the change in the dielectric constant in the induction area caused by the addition of moisture in the skin, and then reflects the moisture content in the skin through the measured mutual capacitance value. This principle can also be applied to measuring the oil content in the skin. Note the difference between the component content in the skin and the secretion substances secreted outside the skin. Water / oil belongs to the biophysical indicators of the skin. When it is outside the skin, it belongs to the secretion substances of the skin, and when it is inside the skin, it belongs to the components of the skin (abbreviation: components).

[0010] It can be seen that whether it is secretion substances or skin components, both can be detected based on the correlation between capacitance and dielectric constant using the mutual capacitance of two electrodes. Therefore, it is hoped that one device can achieve the measurement of both, achieving the multi-functionality and integration of the device. In the R & D process in this direction, we found that since the skin is a multi-layer structure, it can be divided into the epidermis, dermis and subcutaneous tissue from the outside to the inside. To accurately detect the components in the skin, the distance A1 between the two electrodes needs to be controlled so that the mutual capacitance electric field formed only penetrates to the layer to be detected. For example, when detecting the component content of the epidermis, avoid the interference of the same components in the dermis caused by the mutual capacitance electric field penetrating to the dermis; when measuring secretion substances, taking the blotting paper as an example, the blotting paper is placed on the electrode and then contacts the skin to absorb oil. When detecting oil, the electrode is below the blotting paper and the oil is above it. Therefore, it is required that the mutual capacitance electric field formed by the set distance A2 between the electrodes is sufficient to penetrate the thickness of the blotting paper to sense the oil. Due to the influence of the thickness of the blotting paper, A2 is greater than A1. When using one device to achieve both the measurement of secretion and components, if the distance of A1 is used, there will be problems when measuring secretion substances. If the distance of A1 is increased, it will also affect the measurement of components.

[0011] On the other hand, parameters such as the water-oil mixture, moisture content, and oil content of the skin are often studied for their correlations to evaluate the water-oil balance of the skin. Especially, the relationship between the moisture content and the oil content is particularly important for the evaluation system. For the measurement of the moisture content and the oil content, the common measurement methods are as follows:

[0012] (1) Water and oil are measured using different principles. Commonly, as described above, oil is measured using blotting paper in combination with an optical detection method, and water is measured using a capacitance detection method; alternatively, as disclosed in Patent CN116068763A, water is measured by directly irradiating the skin with light and measuring the light reflection amount, and the light reflection amount is used to reflect the water level information of the skin, while the oil measurement uses the change signal of the current of a capacitance sensor to detect the skin oil level information. In such solutions, since water and oil use different detection systems, their correlation is not strong, and the accuracy of the result is poor when fitting the water-oil balance coefficient with water and oil.

[0013] (2) Water and oil are measured by detecting a skin capacitance, and then the water and oil are calculated through a mathematical model. For example, in KR102030131 B1, the skin capacitance is input into a capacitance combination model to calculate water and oil; in CN105662409B, equivalent data models of capacitance with the water content and oil content of human skin are established respectively, and after measuring the capacitance of human skin with a probe electrode, the measured values of the water content and oil content on the skin surface are calculated respectively by combining the equivalent data models. This type belongs to calculating two parameters of water and oil respectively by detecting a skin capacitance, and the mathematical model uses the idea of fitting to establish a mathematical function from the skin capacitance to water and / or oil. The problem with the fitting method is that it is limited by the sample. Generally, it has a high accuracy for the sample population, but once it spreads to a larger detection population, the accurate precision cannot be guaranteed due to individual differences. In addition, the model construction method is relatively complex, so it has not been commercially promoted and applied yet. Summary of the Invention

[0014] On the one hand, the present invention hopes to utilize the characteristics of capacitance detection, such as low cost, easy layout, and capacitance stray immunity. On the other hand, it hopes to solve the conflict when measuring both secretion and components, and at the same time ensure that the measured parameters are from the same detection system, providing a good basis for the water-oil balance index calculated using the parameters.

[0015] To this end, a system for measuring a plurality of complex skin biophysical indicators is provided, including a suction device for sucking skin secretion substances, a measuring device for measuring skin components or measuring skin secretion substances on the suction device, and the suction device and the measuring device are separately arranged; a first bearing member is provided on one side of the body of the suction device facing the skin, and a secretion substance transfer medium with a top surface for contacting the skin is arranged on the first bearing member; the measuring device includes a capacitance digital conversion circuit (CDC) and a measuring controller. A second bearing member is provided on one side of the body of the measuring device facing the skin, and a first detection electrode, a second detection electrode and an insulating layer covering the detection electrodes are arranged on the second bearing member. The detection electrodes are in contact with the skin through the insulating layer or in contact with the top surface of the skin secretion transfer medium. The gap between the first detection electrode and the second detection electrode is configured to penetrate the set layer structure of the skin through the mutual capacitance electric field formed by the two in the state of contacting the skin. The capacitance digital conversion circuit is respectively coupled to each detection electrode, and the measuring controller is coupled to the capacitance digital conversion circuit for obtaining at least two of the first parameter, the second parameter and the third parameter according to the mutual capacitance. Wherein, the first parameter is configured as the capacitance C1 reflecting the skin oil-water mixture obtained when the electrode contacts the skin at the first position through the insulating layer, the second parameter is configured as the capacitance C2 reflecting the skin oil content obtained when the transfer medium contacts the skin at the first position and the electrode contacts the transfer medium through the insulating layer after being transferred by the transfer medium, and the third parameter is configured as the capacitance C3 reflecting the skin moisture content obtained by the electrode at the first position after the transfer.

[0016] The structure and method of the present invention have the following advantages:

[0017] (1) By separately arranging the transfer medium (such as blotting paper) and the electrode for detection to form a suction device and a measuring device respectively. Taking blotting paper as an example in use, the electrode still adopts the spacing for measuring components (configured to penetrate the set layer structure of the skin through the mutual capacitance electric field formed by the two in the state of contacting the skin). When measuring components, the electrode head contacts the skin through the insulating layer, which can avoid the interference caused by the electric field penetrating to other layers; when measuring oil, use blotting paper to suck the skin secretion oil, and then invert the electrode head on the top surface of the blotting paper for measurement. At this time, the electrode head directly contacts the oil through the insulating layer, and the electric field does not need to penetrate the thickness of the blotting paper, solving the conflict when measuring both secretion and components;

[0018] (2) The three parameters C1, C2, and C3 measured by using the same measuring device (the same measuring principle, the same measuring sensing electrode, including the same electrode width and the same electrode gap) can maintain the same dimension between each other. When studying the correlation between the three parameters, it provides a good consistency benchmark and a good foundation for the study of water-oil balance;

[0019] (3) By taking advantage of the characteristics of capacitors, cost control can be achieved, and electrodes are easy to arrange. In combination with a capacitance digital conversion circuit (CDC), such as DAI 7142 and ADI 7147, the Δ-Σ modulation method is adopted to directly convert the value of the measured capacitance into a digital value by repeatedly charging and discharging the measured capacitance and comparing it with a reference capacitance (see: US Patent Number: 5,134,401). The measurement sensitivity of the capacitance is improved to the 1ff level, and at the same time, immunity to stray capacitance is achieved, improving the detection accuracy.

[0020] In the present invention, the secretion transfer medium can be configured as a hydrophilic and oleophobic membrane or a lipophilic and hydrophobic membrane. For example, blotting paper, as a transfer medium, is a hydrophobic and lipophilic material itself. Applying blotting paper can absorb oil secretions for measurement; if the blotting paper is replaced with another transfer medium such as a lipophobic and hydrophilic membrane, it can absorb the moisture secreted by the skin for measurement.

[0021] As an improved solution, the method for obtaining the three parameters C1, C2, and C3 is configured to include the following steps executed in sequence: directly measuring the oil-water mixed capacitance C1 at the first position on the skin with a measuring device; cleaning the surface of the measuring device in contact with the skin, and initializing by measuring the capacitance of the transfer medium on the suction device without oil with the measuring device; contacting the skin at the first position with the transfer medium to obtain skin oil; cleaning the surface of the contact of the measuring device, and measuring the moisture content capacitance C3 by contacting the skin at the first position with the measuring device; cleaning the surface of the contact of the measuring device, and measuring the oil content capacitance C2 in the oil-containing area of the transfer medium with the measuring device. The above measurement sequence can ensure that the interference of water is excluded as much as possible when measuring oil, and the interference of oil is excluded as much as possible when measuring moisture (without mutual interference). At the same time, the overall measurement time-consuming is small, and the operation steps can also be simple.

[0022] Among them, to ensure the detection accuracy, the subject should make test preparations before the test. The subject should not use any skin care products on the area to be tested (the first position) on the skin one day before the test, and should not wash the face on the morning of the test day, and should be left to stand in a constant temperature and humidity (21±1°C, 50±10%RH) environmental laboratory for 15 - 30 minutes for the test.

[0023] As a further improvement of this improved solution, during the measurement process, when obtaining skin oil, considering the absorption rate of the oil blotting paper for the secreted oil, the contact duration of the transfer medium on the skin is set to 15 s - 30 s to make the oil blotting paper reach the absorption saturation state. As another improvement of this improved solution, the moment of measuring the moisture content capacitance C3 is configured to be 60 s - 120 s after the transfer medium leaves the skin. The pressing of the oil blotting paper on the skin surface during oil absorption destroys its natural elastic state. At the same time, as an oil-loving and water-repellent medium, the oil blotting paper cannot achieve 100% water repellency in practice and will still carry away a small amount of skin moisture. Therefore, it is not appropriate to measure the moisture content capacitance C3 immediately after oil absorption. At the same time, if the time is too long, the oil will be re-secreted to a certain amount. Therefore, considering the balance among the skin's elastic recovery, moisture recovery, and the oil re-secretion rate, the time interval of 60 s - 120 s is more conducive to improvement. Since the oil blotting paper carries a small amount of moisture, as another improvement of this improved solution, the method of measuring the oil content capacitance C2 is configured to be executed after the moisture on the transfer medium evaporates. Among them, the method of evaporating the moisture of the transfer medium is preferably configured to statically place the transfer medium. There are two advantages to static placement. One is to use natural wind to achieve water evaporation, and the other is to make the oil diffuse evenly, avoiding detection interference caused by unevenness in subsequent oil detection. However, the longer the time, the more likely it is that changes in the environment such as temperature and humidity will cause interference. To achieve a balance, it is preferably set to statically place for 60 s - 180 s. Of course, heating or ventilation of the transfer medium can also be used to replace or cooperate with static placement to achieve the purpose of quickly evaporating moisture.

[0024] Since the absorption device and the test device are separated, to achieve precise control and synchronization of the above times, the test method is further set with an interaction between the two devices, including: controlling the absorption device to send a first prompt after 15 s - 30 s of the transfer medium contacting the skin, notifying to remove the medium from the skin, starting timing at the same time, and sending a first signal to the measurement device; controlling the measurement device to start timing after receiving the first signal, and sending a second prompt at 60 s - 120 s of timing, notifying to start measuring the moisture content capacitance C3; controlling the absorption device to send a third prompt at 60 s - 180 s of timing, notifying to start measuring the oil content capacitance C2.

[0025] In the present invention, measuring the three parameters of C1, C2, and C3 can be configured to have a set measurement duration, such as 30 s. Programmatically, by obtaining the capacitance values multiple times during the measurement process of each parameter and taking the average, the stability of obtaining the capacitance value is improved.

[0026] For the split skin detection scheme, the suction device is not simply to absorb the oil secreted by the skin, but to transfer the oil on the skin to the medium for testing. In addition, the skin is an elastic tissue, and the size of the squeezing force on it will affect the moisture / oil secreted by the skin. Therefore, for the purpose of detection accuracy, it is necessary to make each suction of the secretion have a unified pressure environment variable and a fixed duration that is consistent with each other. Based on this, as another improvement scheme, in the present invention, the suction device is provided with a suction controller and a first prompt module for sending prompts to the outside, the first bearing component is connected to a first pressure control module for controlling the contact pressure between the secretion transfer medium and the skin, the first pressure control module is configured to have the ability to output an electrical signal to the suction controller, the suction controller is coupled to the first pressure control module and the first prompt module respectively, and the suction controller is coupled with a timer or configured to have a timing ability. When in use, the pressure control device gives the suction controller the ability to sense the contact pressure between the medium and the skin, and then cooperates with a timer (such as an external timing chip) or the suction controller is configured with a timing ability (such as the chip itself has a timing register), so that the suction controller can guide the user to operate through the coupled prompt module to ensure a unified pressure environment and time environment for suction. Similarly, for the measuring device, there is also a unified pressure environment and timing requirement for measurement (whether it is the measurement of secretions or the measurement of components). Therefore, a second prompt module can be set on the measuring device, and the second bearing component is connected to a second pressure control module for controlling the contact pressure between the detection electrode and the measurement object. The second pressure control module is configured to have the ability to output electrical signals to the measurement controller. The measurement controller is coupled to the second pressure control module and the second prompt module respectively. The measurement controller is coupled to a timer or configured to have timing capabilities. For the solution in which both the suction device and the measuring device have pressure detection and control performance, considering that the electrode detection head needs to be pressed on the oil-absorbing paper when the two are placed opposite each other when measuring grease, therefore, the contact pressure controlled by the pressure control modules of the two devices needs to be equal or in the same pressure range during design. Otherwise, when the pressure of one device meets the standard, the pressure of the other device will be too large or too small when placed opposite each other, which destroys the unified pressure environment.

[0027] Furthermore, the pressure control module can adopt the existing structure of a pressure sensor and a motor-driven displacement, but as an improved solution, the pressure control module is configured to include an elastic body and a limit switch, wherein the bearing component is connected to the body through the elastic body so that it has an elastically displaceable active stroke in the direction toward the skin, and the limit switch is arranged in the opposite direction of the bearing component moving toward the skin, and is used to limit the bearing component when it moves a preset distance in this direction and trigger the output of an electrical signal to the suction controller. During detection, the limit switch controls the compression distance, and the elastic body adjusts the pressure value at the preset compression distance to remain stable, thereby achieving stable pressure control and outputting signals while simplifying the structure and cost.

[0028] Furthermore, the suction device or the measuring device is provided with a data transmission module for external communication, such as wired connection or wireless communication like Bluetooth. The data transmission module is coupled to the corresponding controller, enabling the corresponding device to have the ability of external interaction. Visual images and interactive controls can be established on a mobile phone APP, or the test results can be transmitted to a mobile terminal such as a mobile phone for multiple comparisons to prompt changes in the tester's skin condition. More preferably, both the suction device and the measuring device have the ability of external interaction. At this time, the suction device and the measuring device can interact with each other. This solution has advantages when the device tests multiple skin parameters. For example, after the suction device sucks the skin secretion, it communicates to inform the measuring device of the suction time point, so that the measuring device can measure the components at an appropriate time according to the water-oil recovery characteristics.

[0029] As another improvement solution, at least one of the suction device and the measuring device is provided with an alignment structure to locate the contact position between the detection electrode and the top surface of the skin secretion transfer medium, avoiding interference caused by position changes between the two during measurement and ensuring the same position during each measurement. The alignment structure includes a receiving structure provided on one of the suction device and the measuring device, and a mating component provided on the other. The mating component is used to be embedded in the receiving structure, and the suction device and the measuring device are configured such that the detection electrode contacts the top surface of the skin secretion transfer medium in the embedded state. For example, the mating component can be set as an upper positioning hole located on the periphery of the bearing component of the suction device, and the measuring device is provided with a mating upper positioning post. The main body of the measuring device is provided with a channel for the upper positioning post to extend and retract and a push switch for pushing the upper positioning post to extend and retract. The upper positioning post is hidden in the channel and moves under the drive of the push switch to achieve extendability and retractability.

[0030] As another improvement solution, the main body of the suction device forms a movable collection head. The suction device is further provided with a fixed chassis for stably placing on the stage. The fixed chassis can be made of metal products, is stable and does not shake when placed on the stage. The movable collection head is detachably connected to the fixed chassis, and a collection head positioning structure for mutual alignment and positioning between the two is provided. The collection head positioning structure includes a lower positioning hole provided at the bottom of the movable collection head body, and a lower positioning post provided at the top of the fixed chassis for mating with the lower positioning hole. The purpose of setting the fixed chassis is to keep the suction device in a stable state when the measuring device is inverted on the suction device for mutual capacitance measurement, avoiding measurement errors caused by contact displacement between the two devices due to shaking. Description of the Drawings

[0031] Figure 1 Shows a schematic diagram of the overall structure of the skin detection device;

[0032] Figure 2Shows a schematic diagram of the fixed positional relationship between the suction device 100 and the fixed chassis 300;

[0033] Figure 3 Shows a schematic diagram of the structure of the suction device 100;

[0034] Figure 4 Shows a schematic diagram of the structure of the test device 200;

[0035] Figure 5 Shows a schematic diagram of the structure of the first pressure control device 130;

[0036] Figure 6 Shows a schematic diagram of the structure of the second pressure control device 230;

[0037] Figure 7 Shows a schematic diagram of the distribution of the front communication module and the prompt module of the suction device 100;

[0038] Figure 8 Shows a schematic diagram of the distribution of the back prompt module of the suction device 100;

[0039] Figure 9 Shows a schematic diagram of the distribution of the functional modules of the measurement controller 240;

[0040] Figure 10 Shows a schematic diagram of the distribution of the internal energy storage module 243;

[0041] Figure 11 Shows a schematic diagram of the test device 200 used alone to test skin components. Detailed implementation mode

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention.

[0043] As Figure 1 、 Figure 2 shown, the skin detection device mainly includes a suction device 100, a measurement device 200, and a fixed base 300. The measurement device 200 can be used alone, press on the designated position of the skin, and perform measurements according to the prompt operation. The suction device 100 can carry different media to suck the designated components of the skin and test them through the measurement device 200. The suction device 100 and the fixed chassis 300 are matched through the lower positioning hole 170 and the base positioning column 310, which can ensure that the suction device 100 is placed in a fixed position each time, and the fixed chassis 300 can be configured as a metal material to ensure that the suction device 100 does not shake during the pairing and embedding process of the suction device 100 and the test device 200.

[0044] As Figure 3As shown in the figure, the suction device 100 mainly includes a secretion transfer medium 110, a first carrier member 120, a first pressure control device 130, a power device 140, a suction controller 150, an upper positioning hole 160, a lower positioning hole 170, a first communication module 180, and a first prompt module 190. When testing skin secretions, remove the suction device and press the suction device at a specified position on the skin for a certain period of time. The secretion is transferred to the secretion transfer medium 110 through the suction device 100. The secretion transfer medium 110 can be configured as a hydrophilic and oleophobic membrane or a lipophilic and hydrophobic membrane to meet different detection requirements. The power device 140 provides power and moves a specified distance before measurement under the control of the suction controller 150 to achieve the function of replacing the secretion transfer medium 110. The suction control module 150 integrates a first prompt module, and the suction controller 150 is coupled with a timer or configured to have a timing function.

[0045] As Figure 4 As shown in the figure, the testing device 200 is composed of an induction electrode 210, a second carrier member 220, a second pressure control device 230, a measurement controller 240, a switch button 250, and a housing assembly 260. The induction electrode 210 can be configured as a PCB, and test electrodes are arranged on the side close to the test skin, with at least 2 electrodes configured. The measurement controller 240 is coupled with a timer or configured to have a timing function.

[0046] As Figure 5 As shown in the figure, the first pressure control device 130 mainly includes a first limit switch 131, a first guide post 132, and a first elastic body 133. The first elastic body 133 is configured as a tension spring and lifts the first carrier member 120 to the uppermost position in the normal state. During the test, the first carrier member 120 is pressed downward by an external force, causing the first elastic body 133 to deform. When the first carrier member 120 is pressed down to a certain distance, it touches the first limit switch 131, and the first limit switch 131 moves a specified distance to generate an electrical signal. The suction controller 150 controls the first prompt module to give a prompt, and the tester can stop the pressing action to ensure that the pressing distance is the same each time, the deformation degree of the first elastic body 133 is the same, and thus the pressure value during the sampling process is the same. The magnitude of this pressure value can be adjusted by adjusting the stiffness of the first elastic body 133 and the relative position between the first carrier member 120 and the first limit switch 131.

[0047] As Figure 6As shown, the second pressure control device 230 is composed of a second limit switch 231, a second guide post 232, and a second elastic body 233. The second elastic body 233 is configured as a compression spring. In the normal state, it lifts the second load-bearing member 220 to the outermost side. During the test, when an external force acts on the second load-bearing member 220 to move it inward, the second elastic body 233 deforms. When the second load-bearing member 220 moves a certain distance, it touches the second limit switch 231, and the second limit switch 231 moves a specified distance to generate an electrical signal. The measurement controller 240 controls the second prompt module 241 to give a prompt, and the tester can stop the extrusion action, ensuring that the extrusion distance is the same for each test, the deformation degree of the second elastic body 233 is the same, and thus the pressure value during the test is the same. The magnitude of this pressure value can be adjusted by adjusting the stiffness of the second elastic body 233 and the relative position between the second load-bearing member 220 and the second limit switch 231.

[0048] As Figure 7 、 Figure 8 shown, the suction device 100 includes a first communication module 190, a first optical prompt module 181, and a first acoustic prompt module 182. The first communication module 190 can be configured as a wired interface or a wireless communication module. The first optical prompt module 181 and the first acoustic prompt module 182 form the first prompt module 180. During the test acquisition process, the tester removes the suction device 100 from the fixed chassis 300 and presses it against the skin. The first load-bearing member 120 moves under the action of an external force and touches the first limit switch 131, generating an electrical signal that is fed back to the suction controller 150. The first prompt module 180 gives a feedback through the first optical prompt module 181 or the first acoustic prompt module 182, and the tester stops the downward pressing action. The suction controller 150 has a timing function. After a certain period of time, the first prompt module 180 gives a prompt, and the tester completes the acquisition action. This can ensure that the pressure and time for each suction acquisition are the same, avoiding sample errors in suction acquisition caused thereby.

[0049] As Figure 9 、 Figure 10As shown in the figure, the measurement controller 240 is composed of a second prompt module 241, a second communication module 242, and a built-in energy storage module 243. At the same time, the measurement controller 240 is coupled with a timer or configured to have a timing function. The second communication module 242 can be configured as a wired interface or a wireless communication module. The second prompt module 241 can be configured as an optical prompt signal module or an acoustic prompt signal module. During the test, the tester presses the test device 200 against the skin. The second bearing member 220 moves under an external force and touches the second limit switch 231, generating an electrical signal that is fed back to the test controller 240. The second prompt module 241 gives an optical or acoustic feedback through the second prompt module 241. The tester stops the pressing action. The test controller 240 has a timing function. After a certain period of time, the second prompt module 241 gives a prompt, and the tester completes the test action. This can ensure that the pressure and time of each test are consistent, avoiding measurement errors caused thereby. The hand-holding part of the test device 200 guides the placement position of the tester's hand. The shortest distance A between the holding part and the detection electrode is configured to be at least 40 mm. The built-in energy storage module 243 can provide power for the test. An electric control switch 250 for coupling the control module is provided on the outer side wall of the main body of the measurement device 200. The electric control switch 250 starts the circuit during detection and shuts off the detection function when not needed, achieving low power consumption and a long usage time with a single charge. At the same time, the position of the electric control switch 250 is adjacent to the holding part, cooperating with the user's hand usage habit to further guide the user to hold the holding part. The measurement device 200 and the suction device 100 are provided with corresponding alignment structures, including a telescopic guide post 270 and an upper positioning hole 160. The telescopic guide post 270 is located in the internal chute of the test device 200. Two stop positions are set through the cooperation of the chute and the telescopic guide post 270, enabling the telescopic guide post 270 to achieve two states. When extended, it can be matched with the suction device 100. When retracted, the test device 200 can be used alone for component testing. After the suction device 100 sucks and collects the sample, the suction device 100 is placed on the fixed chassis 300. The test device 200 and the suction device 100 are inserted through the alignment structure. When in the embedded state, the induction electrode 210 is in matching contact with the collection area of the secretion substance transfer medium 110 to complete the measurement.

[0050] The following steps are sequentially executed in the method for obtaining skin biophysical indexes:

[0051] As Figure 4 shown in the figure, clean the surface of the induction electrode 210 on the measurement device 200, and directly measure the oil-water mixed capacitance C1 at the first position on the skin with the measurement device 200, as Figure 11 shown in the figure;

[0052] Clean the surface of the induction electrode 210 on the measurement device 200, and initialize the capacitance when the transfer medium on the suction device 100 is oil-free;

[0053] Use the transfer medium on the measuring suction device 100 to contact the skin at the first position to obtain skin oil; after the transfer medium has been in contact with the skin for 20 s, the suction device 100 issues a first prompt to remind the operator to remove the suction device 100, start timing, and send a first signal to the measuring device at the same time;

[0054] Clean the surface of the induction electrode 210 on the measuring device 200. At the moment 120 s after the measuring device receives the first signal, the measuring device issues a second prompt to remind the operator to start measuring water. At this time, the operator uses the measuring device to contact the skin at the first position to measure the moisture content capacitance C3;

[0055] Clean the surface of the induction electrode 210 on the measuring device 200. After the transfer medium has been left standing for 180 s, the suction device 100 issues a third prompt to remind the operator to start measuring oil. At this time, the operator uses the measuring device 200 to measure the oil content capacitance C2 in the oil-containing area of the transfer medium.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A system for measuring a plurality of complex skin biophysical indicators, characterized in that: It includes a suction device for sucking skin secretion substances and a measuring device for measuring skin components or skin secretion substances on the suction device. The suction device and the measuring device are separately arranged; The body of the suction device is provided with a first bearing member on the side facing the skin, and a secretion transfer medium with a top surface for contacting the skin is arranged on the first bearing member; The measuring device includes a capacitance digital conversion circuit and a measurement controller. The body of the measuring device is provided with a second bearing member on the side facing the skin. A first detection electrode, a second detection electrode and an insulating layer covering the detection electrodes are arranged on the second bearing member. The detection electrodes are in contact with the skin through the insulating layer or in contact with the top surface of the skin secretion transfer medium. The gap between the first detection electrode and the second detection electrode is configured to penetrate through the mutual capacitance electric field formed by the two to a set layer structure of the skin in the state of contacting the skin. The capacitance digital conversion circuit is respectively coupled to each detection electrode, and the measurement controller is coupled to the capacitance digital conversion circuit for obtaining at least two of the first parameter, the second parameter and the third parameter according to the mutual capacitance. Among them, the first parameter is configured as the capacitance C1 reflecting the skin oil-water mixture obtained when the electrode contacts the skin at the first position through the insulating layer, the second parameter is configured as the capacitance C2 reflecting the skin oil content obtained when the transfer medium contacts the skin at the first position and the electrode contacts the transfer medium through the insulating layer, and the third parameter is configured as the capacitance C3 reflecting the skin moisture content obtained by the electrode at the first position after the transfer.

2. The system according to claim 1, wherein The method for obtaining parameters includes the following steps executed in sequence: Directly measure the oil-water mixing capacitance C1 at the first position on the skin with the measuring device; Clean the surface of the measuring device in contact with the skin, and initialize by measuring the capacitance of the transfer medium on the suction device without oil with the measuring device; Obtain skin oil by contacting the skin at the first position with the transfer medium; Clean the surface of the measuring device in contact, and measure the moisture content capacitance C3 by contacting the skin at the first position with the measuring device; Clean the surface of the measuring device in contact, and measure the oil content capacitance C2 in the oil-containing area of the transfer medium with the measuring device.

3. The system according to claim 2, wherein: The contact duration of the transfer medium on the skin is configured to be 15s - 30s.

4. The system according to claim 2, wherein: The measurement moment of the moisture content capacitance C3 is configured to be within 60s - 120s after the transfer medium leaves the skin.

5. The system according to claim 2, characterized in that: The method for measuring the oil content capacitance C2 is configured to perform the measurement only after the moisture on the transfer medium has evaporated.

6. The system according to claim 5, characterized in that: The method for evaporating the moisture of the transfer medium is configured to let the transfer medium stand for 60s - 180s, and / or heat or ventilate the transfer medium.

7. The system according to claim 2, characterized in that: Control the suction device to send a first prompt and start timing after the transfer medium contacts the skin for 15s - 30s, and at the same time send a first signal to the measuring device; The control measurement device starts timing after receiving the first signal and issues a second prompt after timing for 60 s - 120 s; The control suction device issues a third prompt after timing for 60 s - 180 s.

8. The system according to claim 1, wherein: The suction device is provided with a suction controller and a first prompt module for sending out prompts externally. The first bearing member is connected with a first pressure control module for controlling the contact pressure between the secretion transfer medium and the skin. The first pressure control module is configured to have the ability to output an electrical signal to the suction controller. The suction controller is respectively coupled with the first pressure control module and the first prompt module. The suction controller is coupled with a timing device or configured to have the timing ability; And / or the measurement device is provided with a second prompt module. The second bearing member is connected with a second pressure control module for controlling the contact pressure between the detection electrode and the measurement object. The second pressure control module is configured to have the ability to output an electrical signal to the measurement controller. The measurement controller is respectively coupled with the second pressure control module and the second prompt module. The measurement controller is coupled with a timing device or configured to have the timing ability.

9. The system according to claim 8, wherein: The pressure control module includes an elastomer and a limit switch; The bearing member is connected to the corresponding body through the elastomer so that it has an elastic displacement travel in the direction towards the measurement object; The limit switch is arranged in the opposite direction of the movement of the bearing member towards the measurement object and is used for limiting the position when the bearing member moves a preset distance in this direction and triggering the output of the electrical signal to the corresponding controller.

10. The system according to claim 8, wherein: The suction device and / or the measurement device is provided with a data transmission module for external communication, and the data transmission module is coupled with the corresponding controller.

11. The system according to claim 1, wherein: At least one of the suction device and the measurement device is provided with an alignment structure to locate the contact position between the detection electrode and the top surface of the skin secretion transfer medium.

12. The system according to claim 11, wherein: The alignment structure includes a receiving structure provided on one of the suction device and the measurement device, and an inlaying component provided on the other. The inlaying component is used for inlaying into the receiving structure. The suction device and the measurement device are configured to make the detection electrode contact the top surface of the skin secretion transfer medium in the inlaid state.

13. The system according to claim 1, wherein: The body of the suction device forms a movable collection head. The suction device is further provided with a fixed chassis for stably placing on the stage. The movable collection head is detachably connected to the fixed chassis and is provided with a collection head positioning structure for inlaying and positioning between the two.

Images