Methods and devices for continuous sweat detection

Abstract

This invention relates to the field of physiological information detection technology, and particularly to a method and device for continuous sweat detection. The method includes: a sweat collection microchannel of the sweat detection device absorbing sweat from the skin surface; a detection orifice absorbing sweat at the end of the sweat collection microchannel; a detection sensor located in the detection orifice performing data analysis on the sweat; an evaporation plate absorbing the sweat in the detection orifice for evaporation; and the sweat collection microchannel continuously absorbing sweat from the skin surface based on the evaporation of the evaporation plate. The main objective of this invention is to provide a sweat detection device designed to sustainably collect and detect sweat.

Description

Technical Field

[0001] This invention relates to the field of physiological information detection technology, and in particular to a method and device for continuous sweat detection. Background Technology

[0002] Sweat contains abundant electrolytes, metabolites, proteins, metal ions, and other biomarkers. Changes in the concentration of different chemical substances can reflect changes in a person's physiological state and health status.

[0003] In related technologies, the detection chamber of a sweat detection device is a closed or semi-closed reaction pool. After the sweat flows in and reacts with the test strip, it is retained. There is a lack of a microfluidic control mechanism to drive the continuous flow of sweat and refresh the sweat sample. This makes it impossible to perform a new round of detection on subsequent sweat. It can only reflect the cumulative average concentration over a certain period of time and cannot capture the dynamic change curve of glucose concentration over time. Therefore, the existing sweat glucose detection patch has the problem of not being able to achieve continuous sweat renewal and dynamic monitoring. Summary of the Invention

[0004] The main objective of this invention is to provide a sweat detection device designed to sustainably collect and detect sweat.

[0005] To achieve the above objectives, the present invention proposes a continuous sweat detection method and a sweat detection device, the sweat detection device comprising a sweat collection microchannel, a detection hole, a detection sensor, and an evaporation plate, wherein the detection hole communicates with the sweat collection microchannel, and at least a portion of the evaporation plate is aligned with the detection hole, the method comprising: The sweat detection device uses a microchannel to absorb sweat from the skin surface. The detection orifice absorbs sweat located at the end of the sweat collection microchannel; The detection sensor located in the detection hole detects sweat at its detection end; The evaporation plate absorbs sweat located in the detection hole for evaporation; The sweat collection microchannel continuously absorbs sweat from the skin based on the evaporation of the evaporation plate.

[0006] In one embodiment of the present invention, the sweat detection device further includes a thermoelectric generator module disposed between the sweat collection microchannel and the evaporation plate, and the method further includes: The thermoelectric power generation module uses the temperature conducted by the sweat collection microchannel as the hot end of the thermoelectric power generation module and the temperature maintained by the evaporation plate due to sweat evaporation as the cold end of the thermoelectric power generation module, so as to create a temperature difference on both sides of the thermoelectric power generation module to generate electricity. The thermoelectric power generation module supplies the generated electrical energy to the detection sensor.

[0007] In one embodiment of the present invention, the sweat detection device further includes a heat dissipation duct, at least a portion of which passes between the evaporation plate and the cold end of the thermoelectric generator module, and the method further includes: External air flows through the aforementioned heat dissipation duct; At least a portion of the air in the heat dissipation duct flows through the cold end of the thermoelectric power generation module to reduce the cold end temperature of the thermoelectric power generation module.

[0008] In one embodiment of the present invention, the cross-section of the heat dissipation duct gradually narrows along the airflow direction, so that the air in the heat dissipation duct accelerates and washes over the cold end of the thermoelectric power generation module.

[0009] In one embodiment of the present invention, after the step of external air flowing through the heat dissipation duct, the method further includes: At least a portion of the air in the heat dissipation duct flows over the surface of the evaporation plate to carry away the water vapor generated by the evaporation of sweat.

[0010] In one embodiment of the present invention, the evaporation plate includes a traction layer, a diffusion layer, and an evaporation layer. The traction layer has a liquid collection area, the diffusion layer has a capillary guiding structure, and the evaporation layer has microgrooves. The step of the evaporation plate absorbing sweat located in the detection hole for evaporation includes: The liquid collection area of ​​the traction layer absorbs the sweat located in the detection hole; The diffusion layer capillary structure diffuses the sweat located in the liquid collection area; The micro-grooves of the evaporation layer spread sweat into a liquid film for evaporation.

[0011] In one embodiment of the present invention, the method further includes: The circuit module containing the detection sensor is thermally isolated from the thermoelectric power generation module to prevent the heat generated by the circuit module during operation from being transferred to the cold end of the thermoelectric power generation module.

[0012] In one embodiment of the present invention, the sweat detection device further includes a thermal bridge, and the method further includes: The thermal bridge transfers the heat generated by the circuit module during operation to the hot end of the thermoelectric generator module.

[0013] In one embodiment of the present invention, the sweat detection device further includes a heat-conducting column, and the method further includes: The heat-conducting pillars transfer the heat generated by the circuit module during operation to the evaporation layer of the evaporation plate.

[0014] The present invention also proposes a sweat detection device for implementing the continuous sweat detection method described in any one of the above-mentioned methods, the sweat detection device comprising: A patch module, wherein the patch module is provided with a sweat collection microchannel and a detection hole communicating with the sweat collection microchannel; A circuit module, wherein the circuit module is disposed on the surface mount module, the circuit module having a detection sensor, the detection end of the detection sensor being located in the detection hole; and An evaporation plate is disposed on the patch module and at least adheres to the detection hole area. The evaporation plate is configured to absorb sweat located in the detection hole for sweat evaporation.

[0015] In this technical solution, the continuous sweat detection method provided by the present invention can solve the problem that existing sweat detection technologies cannot continuously update sweat and cannot achieve dynamic monitoring, resulting in only reflecting the cumulative average concentration, by adopting a microfluidic control mechanism driven by an evaporation plate. Specifically, this method proposes a detection device integrating a sweat collection microchannel, a detection orifice, a detection sensor, and an evaporation plate, and constructs a physically driven continuous working cycle: First, the sweat collection microchannel actively absorbs sweat from the skin surface using capillary action and transports it to its end; then, the detection orifice connected to it absorbs the sweat at this end, allowing the sweat to reach the detection area. At this time, the detection sensor located in the detection orifice can perform real-time data analysis on the sweat flowing there; simultaneously, the evaporation plate positioned opposite the detection orifice continuously absorbs and evaporates the sweat within the detection orifice. Because the evaporation process of the evaporation plate causes a local reduction in liquid at the detection orifice and the end of the microchannel connected to it, a continuous capillary pressure difference is generated. This pressure difference allows the sweat collection microchannel to continuously absorb fresh sweat from the skin surface based on the evaporation effect of the evaporation plate, replenishing the evaporated sweat, thus forming an "absorption" effect. This method employs a self-driven closed loop of "collection-detection-evaporation-reabsorption." The continuous evaporation of sweat by the evaporation plate creates a unidirectional, continuous flow of sweat within the microchannels and detection orifices. This ensures the detection sensor remains in constant contact with the sweat sample, enabling continuous acquisition of dynamic data on biomarker concentrations over time. This allows for continuous sweat renewal and dynamic monitoring. Furthermore, utilizing the natural physical process of sweat evaporation as the driving force eliminates the need for external pumps or complex moving parts, simplifying the device structure and improving reliability and wearing comfort. The continuous flow of sweat also prevents sweat from stagnating and degrading in the detection area, reducing the risk of sensor saturation or cross-contamination due to sweat accumulation. This ensures each detection more accurately and promptly reflects the physiological state at the moment of sampling, providing a more accurate time-concentration curve for health monitoring. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the first process of the continuous sweat detection method provided by the present invention. Figure 2 This is a schematic diagram of the second process of the continuous sweat detection method provided by the present invention; Figure 3 This is a schematic diagram of the third process of the continuous sweat detection method provided by the present invention; Figure 4 This is a schematic diagram of the fourth process of the continuous sweat detection method provided by the present invention; Figure 5 This is a schematic diagram of the fifth process of the continuous sweat detection method provided by the present invention; Figure 6 This is a schematic diagram of an embodiment of the sweat detection device provided by the present invention; Figure 7 for Figure 6 Exploded view of the structure; Figure 8 This is a schematic diagram of a structure of an embodiment of the limiting bracket provided by the present invention; Figure 9 A schematic diagram of sweat flow in an embodiment of the skin patch provided by the present invention; Figure 10 A schematic diagram of sweat flow in an embodiment of the skin patch provided by the present invention; Figure 11 A schematic diagram of a structure of a heat dissipation duct provided by the present invention; Figure 12 A schematic diagram of airflow in an embodiment of the heat dissipation duct provided by the present invention; Figure 13 This is a cross-sectional schematic diagram of an embodiment of the evaporation plate provided by the present invention.

[0018] Explanation of icon numbers: 100. Sweat detection device; 10. Patch module; 10a. Sweat collection microchannel; 10b. Detection port; 11. Skin patch; 11a. Receiving cavity; 12. Limiting bracket; 12a. First limiting cavity; 12b. Second limiting cavity; 20. Circuit module; 30. Thermoelectric generator module; 30a. Heat sink; 40. Heat dissipation air duct; 40a. First air intake section; 40b. Second air intake section; 50. Evaporation plate; 51. Traction layer; 52. Diffusion layer; 53. Evaporation layer; 60. Thermal insulation layer; 61. Thermal bridge; 70. Fasteners.

[0019] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0022] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0023] The main objective of this invention is to provide a sweat detection device 100, which aims to achieve sustainable sweat collection and detection.

[0024] To achieve the above objectives, the present invention proposes a continuous sweat detection method and a sweat detection device 100. The sweat detection device 100 includes a sweat collection microchannel 10a, a detection hole 10b, a detection sensor, and an evaporation plate 50. The detection hole 10b communicates with the sweat collection microchannel 10a, and at least a portion of the evaporation plate 50 is aligned with the detection hole 10b. (See also...) Figure 1 The method includes: S10: The sweat collection microchannel 10a of the sweat detection device 100 absorbs sweat from the skin surface. S20: The detection hole 10b absorbs the sweat located at the end of the sweat collection microchannel 10a; S30: The detection end of the detection sensor located in the detection hole 10b performs data analysis on the sweat. S40: The evaporation plate 50 absorbs the sweat located in the detection hole 10b for evaporation; S50: The sweat collection microchannel 10a continuously absorbs sweat from the skin surface based on the evaporation of the evaporation plate 50.

[0025] The sweat detection device 100 proposed in this invention is a non-invasive detection device that is directly attached to the skin surface, such as the neck or arms. The detection sensor can identify various biomarkers contained in sweat, such as electrolytes, metabolites, and hormones, and then convert these biological information into detectable electrical signals, providing raw data support for subsequent analysis of human physiological indicators, environmental parameters, or chemical substance concentrations. The sweat detection device 100 achieves specific detection purposes by detecting target substances in sweat, such as blood glucose monitoring, electrolyte monitoring, hormone monitoring, etc. It is understood that the sweat detection device 100 proposed in this invention is not limited to specific detection objects, and different physiological information can be detected by using different detection sensors.

[0026] In step S10, when the sweat detection device 100 is attached to the skin, the sweat collection microchannels 10a at its bottom, which have a hydrophilic inner surface, actively and continuously capture and absorb the secreted sweat from the skin surface using capillary action. These microchannels, as initial liquid transport channels, can collect dispersed sweat, providing a stable and continuous source of sweat samples for subsequent detection and analysis.

[0027] In step S20, the detection orifice 10b of the sweat detection device 100 absorbs sweat located at the end of the sweat collecting microchannel 10a. Specifically, the sweat collecting microchannel 10a guides and collects the sweat to its end, and the end of the sweat collecting microchannel 10a is connected to the detection orifice 10b. This detection orifice 10b also has hydrophilic properties, actively drawing sweat from the end of the microchannel into its interior through capillary action. This step S20 completes the transfer of sweat from the skin surface to the fixed detection position, ensuring that the sweat accurately reaches the preset analysis point.

[0028] In step S30, the detection end of the detection sensor of the sweat detection device 100 located in the detection hole 10b analyzes the sweat data. When sweat flows through or fills the detection hole 10b, the detection end of the detection sensor, which is pre-installed in the detection hole 10b, makes direct and full contact with the sweat. The detection sensor, such as an electrochemical sensor or an ion-selective electrode, can specifically identify target biomarkers in sweat, such as glucose, sodium ions, and cortisol, and convert their chemical concentration information into electrical signals, such as changes in current, voltage, or impedance, that can be read and processed by subsequent circuits. This step realizes the transformation from biological samples to quantitative data.

[0029] In step S40, the evaporation plate 50 of the sweat detection device 100 absorbs the sweat located in the detection hole 10b for evaporation. Specifically, at least a portion of the evaporation plate 50 is aligned and tightly fitted above or to the outlet area of ​​the detection hole 10b. The evaporation plate 50 utilizes its material, such as a hydrophilically treated carbon fiber-cotton composite material, which has capillary adsorption properties, to continuously draw the detected sweat from the detection hole 10b. Subsequently, the absorbed sweat diffuses within the evaporation plate 50 and eventually reaches its large evaporation surface exposed to the external environment. On the evaporation surface, the sweat continuously evaporates into the air in a phase transition from liquid to gas; this phase change process is evaporation.

[0030] In step S50, the sweat collecting microchannel 10a of the sweat detection device 100 continuously absorbs sweat from the skin surface based on the evaporation of the evaporation plate 50. Due to the continuous evaporation of the evaporation plate 50, a stable "liquid pool" is created at the detection hole 10b and the end of the microchannel connected to it, thereby forming a continuous capillary negative pressure or pressure gradient in this area. This evaporation-driven negative pressure, as the driving force for sweat flow, in turn continuously "pulls" the starting end of the sweat collecting microchannel 10a to absorb sweat from the skin surface to replenish the liquid loss due to evaporation. Thus, steps S10 to S50 form a complete, self-driven physical cycle: collection (S10) → delivery and positioning (S20) → detection (S30) → removal and evaporation (S40) → driving re-collection (S50). It is based on this continuous driving force generated by the evaporation of the evaporation plate 50 that the sweat collection microchannel 10a can continuously absorb new sweat, thereby ensuring that the entire device can realize continuous updating of sweat samples and dynamic, long-term monitoring of physiological indicators.

[0031] In one application scenario, the user attaches the sweat detection device 100 to the skin of the upper arm for daily blood glucose trend monitoring. The entire monitoring process is completed autonomously by the sweat detection device 100, requiring no manual activation or intervention from the user. Specifically, after the user attaches the sweat detection device 100 to the skin of the upper arm, the sweat collection microchannel 10a of the sweat detection device 100 automatically captures a small amount of sweat from the skin using capillary action. The sweat is automatically guided to the detection hole 10b in the sweat collection microchannel 10a, where the glucose sensor performs real-time concentration analysis. Simultaneously, the evaporation plate 50 absorbs the sweat in the detection hole 10b for evaporation. The sweat evaporation effect automatically drives the sweat collection microchannel 10a to absorb new sweat on the skin. The entire physical detection and sample update process is performed silently and autonomously within the patch.

[0032] In one embodiment of the present invention, please refer to Figure 2 The sweat detection device 100 further includes a thermoelectric generator module, which is disposed between the sweat collection microchannel 10a and the evaporation plate 50. The method further includes: S61: The thermoelectric power generation module uses the temperature conducted by the sweat collection microchannel 10a as the hot end of the thermoelectric power generation module, and uses the temperature maintained by the evaporation plate 50 due to sweat evaporation as the cold end of the thermoelectric power generation module, so as to form a temperature difference on both sides of the thermoelectric power generation module to generate electricity. S62: The thermoelectric power generation module supplies the generated electrical energy to the detection sensor.

[0033] In step S61, the thermoelectric power generation module of the sweat detection device 100 utilizes the skin temperature conducted by the sweat collecting microchannel 10a as its hot end and the lower temperature maintained by the evaporation plate 50 due to sweat evaporation as its cold end, thereby forming and maintaining a stable temperature gradient between the two contact surfaces of the thermoelectric power generation module. Specifically, the sweat collecting microchannel 10a attached to the skin continuously conducts heat from the human body surface to one side of the thermoelectric power generation module in close contact with it; at the same time, the evaporation plate 50, due to the continuous heat absorption process of sweat evaporation, usually has a temperature lower than body temperature, thus providing a continuously low-temperature interface for the thermoelectric power generation module in close contact with it. The thermoelectric power generation module generates electricity based on the Seebeck effect and the temperature difference formed by the skin temperature and the ambient temperature.

[0034] In step S62, the thermoelectric power generation module supplies the generated electrical energy to the circuit module 20 containing the detection sensor. The electrical energy generated by the thermoelectric power generation module is directly output and managed to power the entire circuit module 20, including but not limited to driving the detection sensor, powering the microprocessor and signal conditioning circuit, and supporting the operation of wireless communication modules (such as Bluetooth). Of course, Near Field Communication (NFC) technology can also be used to achieve information interaction with smart devices.

[0035] Through the above steps, the sweat detection device 100, based on the thermoelectric generator module, can reduce or eliminate its dependence on batteries, enabling the sweat detection device 100 to provide the necessary energy guarantee for long-term, continuous dynamic monitoring.

[0036] In one embodiment of the present invention, please refer to Figure 3 The sweat detection device 100 further includes a heat dissipation duct 40, at least a portion of which passes between the evaporation plate 50 and the cold end of the thermoelectric generator module. The method further includes: S71: External air flows through the heat dissipation duct 40; S72: At least a portion of the air in the heat dissipation duct 40 flows through the cold end of the thermoelectric power generation module to reduce the cold end temperature of the thermoelectric power generation module.

[0037] In step S71, external air flows through the heat dissipation duct 40 of the sweat detection device 100. At least a portion of the structure of the heat dissipation duct 40 passes through the gap between the evaporation plate 50 and the cold end of the thermoelectric generator module, forming a physical channel for gas flow. The introduction of airflow includes, but is not limited to, the following implementation methods: first, driven by environmental factors, such as natural wind or airflow in the environment creating a pressure difference around the device, prompting air to enter the duct; second, when the user is in motion (such as walking or running), the relative movement of their body and the air can effectively guide the airflow into and through the duct; third, natural convection or micro-airflow in a resting state, even when the user is relatively stationary, the weak airflow generated by local temperature difference or environmental ventilation can be captured and guided by the duct structure. The design of the heat dissipation duct 40 ensures that external air can be effectively guided through its interior in any one or more of the above situations.

[0038] In step S72, the air (or at least a portion thereof) flowing through the heat dissipation duct 40 directly flows through and washes the cold end surface of the thermoelectric generator module to reduce its temperature. Specifically, when the air flows through the relatively low-temperature cold end surface, the waste heat generated by the thermoelectric generator module during operation is continuously and effectively removed through forced convection heat transfer. This active heat dissipation process enhances the cooling effect of the cold end of the thermoelectric generator module, enabling it to maintain a lower and more stable temperature level. This controls or increases the effective operating temperature difference between the hot end (from body heat) and the cold end (enhanced by air cooling) of the thermoelectric generator module. According to the Seebeck effect, the increase in temperature difference can be converted into higher thermoelectric conversion efficiency and power output, thereby improving the energy supply capacity of the thermoelectric generator module.

[0039] In one embodiment of the present invention, the cross-section of the heat dissipation duct 40 gradually narrows along the airflow direction, so that the air in the heat dissipation duct 40 accelerates and washes over the cold end of the thermoelectric power generation module.

[0040] In this embodiment, the cross-sectional area (i.e., the flow channel cross-section) of the heat dissipation duct 40 gradually decreases along the direction of airflow, forming a tapered flow channel structure. Thus, when external air (whether generated by ambient wind, user movement, or natural convection) enters the inlet end of the tapered heat dissipation duct 40, as the air flows inward, the airflow speed will increase significantly due to the continuous decrease in the flow channel cross-section. This means that when the air reaches the cold end of the thermoelectric generator module, its flow velocity has been effectively increased, and the cold end of the thermoelectric generator module comes into contact with more air per unit time, further improving the air cooling efficiency.

[0041] In one embodiment of the present invention, please refer to Figure 3 After step 71, the following also includes: S73: At least a portion of the air in the heat dissipation duct 40 flows over the surface of the evaporation plate 50 to carry away the water vapor generated by the evaporation of sweat.

[0042] In this step, the air (or at least a portion thereof) flowing through the heat dissipation duct 40 flows over the surface of the evaporation plate 50 to carry away water vapor generated by sweat evaporation. Specifically, at least a portion of the air flowing through the heat dissipation duct 40 is guided to the evaporation area of ​​the evaporation plate 50 exposed to the air. When sweat undergoes phase change evaporation on the surface of the evaporation plate 50, a layer of saturated air with high humidity (boundary layer) is formed near the liquid surface. This inhibits further evaporation. The flowing air directly washes over the evaporation surface, effectively disrupting and dispersing this saturated air layer, continuously reducing the vapor partial pressure near the evaporation interface, thereby maintaining and expanding the vapor concentration difference (or vapor pressure difference) between the liquid surface and the mainstream air. This process significantly accelerates the mass transfer rate of sweat from liquid to gas, especially when the heat dissipation duct 40 adopts a tapered design to increase the airflow velocity. The air flowing over the evaporation surface has a larger flow rate and is renewed faster per unit time. This means that the evaporation surface comes into contact with more "dry" air with lower humidity per unit time, thereby further improving the evaporation efficiency of sweat. The improved evaporation efficiency directly enhances the evaporation-driven effect described in step S50, enabling the sweat collection microchannel 10a to generate stronger capillary negative pressure to absorb sweat, ensuring a more robust and stable microfluidic cycle. Simultaneously, evaporation itself is an endothermic process, and the improved evaporation efficiency means that more heat can be removed from the evaporation plate 50 itself. This helps maintain the low temperature at the cold end of the thermoelectric power generation module in contact with it, forming a synergistic enhancement cycle that mutually promotes heat dissipation, evaporation, and power generation efficiency.

[0043] In one embodiment of the present invention, please refer to Figure 4 The evaporation plate 50 includes a traction layer 51, a diffusion layer 52, and an evaporation layer 53. The traction layer 51 has a liquid collection area, the diffusion layer 52 has a capillary guiding structure, and the evaporation layer 53 has micro-grooves. Step 40 includes: S41: The liquid collection area of ​​the traction layer 51 absorbs the sweat located in the detection hole 10b; S42: The diffusion layer 52 capillary guiding structure diffuses the sweat located in the liquid collection area; S43: The micro-grooves of the evaporation layer 53 spread sweat to form a liquid film for evaporation.

[0044] In step S41, the collection area of ​​the traction layer 51 of the evaporation plate 50 of the sweat detection device 100 absorbs the sweat located in the detection hole 10b. Specifically, the traction layer 51 serves as the functional interface of the evaporation plate 50 directly facing the detection hole 10b, and its collection area is aligned and tightly fitted to the outlet area of ​​the detection hole 10b. This collection area is typically made of a material with high capillary force and excellent hydrophilicity (such as a dense cotton fiber woven layer or a plasma-treated polymer film). Its function is to actively and efficiently capture the sweat flowing out of the detection hole 10b and continuously "draw" it out of the detection hole 10b using strong capillary adsorption, completing the crucial first step of transferring sweat from the detection area to the interior of the evaporation plate 50.

[0045] In step S42, the capillary structure of the diffusion layer 52 of the evaporation plate 50 of the sweat detection device 100 diffuses the sweat located in the collection area. Specifically, the sweat captured in the collection area of ​​the traction layer 51 is rapidly transferred to the adjacent diffusion layer 52. The diffusion layer 52 has a fine capillary structure (e.g., microgrooves, ridges, or fiber networks of a specific weave density extending radially from the collection area). These structures utilize stronger directional capillary forces to quickly and orderly transport and laterally spread the sweat collected from the collection area to a wider area of ​​the evaporation plate 50. The core function of this step is to achieve efficient area expansion of sweat from "points" to "surfaces," creating the necessary conditions for subsequent large-area evaporation.

[0046] In step S43, the microgrooves of the evaporation layer 53 of the evaporation plate 50 of the sweat detection device 100 spread the sweat to form a liquid film for evaporation. Specifically, the sweat, evenly distributed by the diffusion layer 52, is transported to the outermost evaporation layer 53. The substrate of the evaporation layer 53 is typically a porous, fluffy material (such as cotton wool or open-cell foam), and its side facing the diffusion layer 52 has a large network of microgrooves. These microgrooves are connected to the ends of the capillary guide structures from the diffusion layer 52, further spreading the sweat into an extremely thin liquid film on its surface and in the shallow pores, thereby maximizing the gas-liquid contact surface area. Subsequently, the sweat undergoes a phase change (evaporation) on this large exposed surface, and the resulting negative pressure drives the entire microfluidic circulation. At the same time, the porous structure and microgrooving design of the evaporation layer 53 also facilitate air circulation, thereby maintaining a high mass transfer (vapor diffusion) rate and ensuring a continuous and stable evaporative cooling effect.

[0047] In one embodiment of the present invention, the method further includes: The circuit module 20 containing the detection sensor is thermally isolated from the thermoelectric power generation module to prevent the heat generated by the circuit module 20 during operation from being transferred to the cold end of the thermoelectric power generation module.

[0048] In this step, the circuit module 20 containing the detection sensor is thermally isolated from the thermoelectric power generation module. This thermal isolation can be achieved by constructing a physical separation between them, setting up a thermal barrier made of a low thermal conductivity material (such as aerogel, foamed polymer, or vacuum insulation layer), or placing them in separate chambers separated by thermal insulation materials. This prevents the Joule heat generated by the circuit module 20 during operation (such as signal amplification, data processing, and wireless communication) from being transferred to the cold end of the thermoelectric power generation module via heat conduction or radiation. Since the power generation efficiency and output power of the thermoelectric power generation module directly depend on the temperature difference between its cold and hot ends, if the waste heat from the circuit module 20 raises the temperature of the cold end, it will reduce the effective temperature difference between the cold and hot ends of the thermoelectric power generation module, thereby weakening its power generation capacity. This thermal isolation step ensures that the cold end temperature of the thermoelectric power generation module is controlled by the evaporative cooling effect of the evaporation plate 50 and the active air cooling of the heat dissipation duct 40. This establishes and maintains a stable operating temperature difference as large as possible between the cold end of the thermoelectric power generation module and the body heat conducted through the sweat collection microchannel 10a, ensuring that the thermoelectric power generation module can continuously and efficiently generate electricity, providing a reliable energy foundation for the long-term, self-sustaining operation of the entire device.

[0049] In one embodiment of the present invention, please refer to Figure 5 The sweat detection device 100 further includes a thermal bridge 61, and the method further includes: S80: The thermal bridge 61 transfers the heat generated by the circuit module 20 during operation to the hot end of the thermoelectric generator module.

[0050] In this step, the sweat detection device 100, through the provided thermal bridge 61, can actively and directionally transfer the heat generated by the circuit module 20 during operation to the hot end of the thermoelectric power generation module. Specifically, the thermal bridge 61 is made of a high thermal conductivity material (such as copper, aluminum, or a high thermal conductivity graphite composite material), and its two ends are connected to the insulating surface of the circuit module 20 and the hot end surface of the thermoelectric power generation module, respectively. This design allows the heat generated by the circuit module 20 to be efficiently conducted along the specific path formed by the thermal bridge 61.

[0051] Based on the above, the thermal bridge 61 provides a controllable release channel for waste heat from the circuit, preventing its disorderly accumulation inside the device that could affect sensor accuracy or other components. On the other hand, the thermal bridge 61 guides this waste heat to the hot end of the thermoelectric generator module, serving as an additional thermal energy supplement and actively raising the temperature level of its hot end. Thus, while evaporative cooling and air cooling jointly maintain a low cold end temperature, the hot end temperature is further increased due to the injection of waste heat, thereby further expanding the effective operating temperature difference between the cold and hot ends of the thermoelectric generator module.

[0052] In one embodiment of the present invention, please refer to Figure 5 The sweat detection device 100 further includes a heat-conducting column, and the method further includes: S90: The heat-conducting pillars transfer the heat generated by the operation of the circuit module 20 to the evaporation layer 53 of the evaporation plate 50.

[0053] In this step, the sweat detection device 100 actively and directionally transfers the heat generated by the circuit system during operation to the evaporation layer 53 of the evaporation plate 50 via a heat-conducting column. Specifically, the heat-conducting column is made of a high thermal conductivity material (such as copper, aluminum, or highly oriented graphite). One end of the column is thermally connected to the main heat-generating element of the circuit system, while the other end extends and is embedded in or in close contact with the porous structure or micro-groove network of the evaporation layer 53. Based on this, the heat-conducting column can directly transport the waste heat from the circuit to the physical location where sweat evaporation actually occurs—the liquid film interface of the evaporation layer 53. This heat can serve as an additional phase change driving force, providing it to the sweat molecules undergoing liquid-to-gas transition, thereby directly increasing the sweat evaporation rate in the local area. The improvement means that the amount of liquid removed from the detection hole 10b and the end of the microchannel per unit time increases. This directly enhances the capillary negative pressure or suction force generated by the evaporation process. This enhanced driving force enables the sweat collection microchannel 10a to absorb fresh sweat from the skin surface more quickly and effectively, thereby strengthening the flow rate and stability of the entire "collection-detection-evaporation" closed-loop microfluidic system. At the same time, the sweat evaporation process itself is endothermic. The waste heat transported by the heat-conducting column promotes evaporation, and its energy is also dissipated during the phase change process. This helps to maintain or even reduce the overall temperature of the evaporation layer 53 and its substrate. The lower temperature of the evaporation plate 50 is conducive to maintaining the low temperature of the cold end of the adjacent thermoelectric power generation module, thereby indirectly helping to maintain or increase the power generation temperature difference and improve power generation efficiency.

[0054] Based on the above, the sweat detection device 100 proposed in this method and used to implement the continuous sweat detection method described in any one of the above-mentioned methods will be explained at the structural level.

[0055] The sweat detection device 100 includes: The patch module 10 is provided with a sweat collection microchannel 10a and a detection hole 10b communicating with the sweat collection microchannel 10a; Circuit module 20, disposed on the patch module 10, includes a detection sensor with its detection end located in the detection hole 10b; and An evaporation plate 50 is disposed on the patch module 10 and at least adheres to the area of ​​the detection hole 10b. The evaporation plate 50 is configured to absorb sweat located in the detection hole 10b for sweat evaporation.

[0056] Please see Figure 6 and Figure 7 Specifically, the patch module 10 includes a skin patch 11 and a limiting bracket 12. The limiting bracket 12 is disposed on the skin patch 11, the circuit module 20 and the thermoelectric power generation module are disposed in the limiting bracket 12, and the evaporation plate 50 covers the limiting bracket 12. The bottom of the skin patch 11 is provided with a sweat collection microchannel 10a, and the limiting bracket 12 is provided with a detection hole 10b.

[0057] One side of the skin patch 11 is provided with a sweat collection microchannel 10a, and the other side is provided with a receiving cavity 11a, in which the limiting bracket 12 is fixed. The skin patch 11, as the bottom flexible component that directly contacts the skin, is usually made of biocompatible medical-grade silicone or polymer hydrogel film. The bottom of the skin patch 11 (i.e. the side close to the skin) is processed with a sweat collection microchannel 10a for initial collection and guidance of sweat, and the top (i.e. the side facing away from the skin) is designed with a receiving cavity 11a, which provides an integrated space for the circuit module 20, the thermoelectric power generation module and the evaporation plate 50.

[0058] The limiting bracket 12 is a rigid or semi-rigid frame with a specific contour and positioning structure, typically injection molded from rigid plastic or composite material. It is securely fixed within the receiving cavity 11a of the skin patch 11. The limiting bracket 12 has dedicated slots or fixing positions for accommodating the circuit module 20 and the thermoelectric generator module, ensuring their precise positioning and preventing displacement. A detection hole 10b penetrates the limiting bracket 12, ensuring that when the circuit module 20 is installed, the detection end of its sensor aligns with and passes through this hole, contacting sweat from the microchannels of the skin patch 11. The limiting bracket 12 has mutually isolated first limiting cavities 12a and second limiting cavities 12b. The circuit module 20 is positioned and fixed within the first limiting cavity 12a, and the thermoelectric generator module is positioned and fixed within the second limiting cavity 12b. The evaporation plate 50, as the upper covering, is sized to simultaneously cover and conform to both the lower first limiting cavity 12a and the second limiting cavity 12b. Furthermore, the detection hole 10b is directly formed on the inner wall of the first limiting cavity 12a, allowing sweat in the sweat collection microchannel 10a to flow directly through the detection end of the detection sensor located in the detection hole 10b. Because the first limiting cavity 12a and the second limiting cavity 12b are isolated, an effective thermal barrier is constructed between the circuit module 20 and the thermoelectric power generation module, preventing the heat generated by the circuit module 20 during operation from being transferred to the thermoelectric power generation module. This ensures a sufficiently large temperature difference between the first contact surface and the second contact surface of the thermoelectric power generation module, thereby ensuring the stability of the power generation efficiency and output power of the thermoelectric power generation module.

[0059] The circuit module 20, located above the patch module 10, serves as the signal sensing and processing center of the sweat detection device 100. The circuit module 20 is equipped with a detection sensor, whose detection end is located in the detection hole 10b of the patch module 10, ensuring direct and continuous contact with flowing sweat. The type of detection sensor can be set according to the detection target (such as glucose, potassium ions, cortisol, etc.), and is not limited here. The working principle of the detection sensor is to convert the chemical information of specific biomarkers in sweat into measurable electrical signals. Simultaneously, the circuit module 20 also has a communication unit, an information processing unit, and an information storage unit. The information processing unit is responsible for amplifying, filtering, and performing analog-to-digital conversion on the raw electrical signal output by the detection sensor, and calculating the corresponding target concentration data. The information storage unit is used to temporarily or permanently store this timestamped dynamic concentration data, thereby recording a complete concentration change curve. The communication unit, such as a miniature Bluetooth module or a near-field communication module, is responsible for wirelessly transmitting the processed data to external devices, such as smartphones or the cloud, enabling users to view monitoring results and historical trends in real time.

[0060] The thermoelectric power generation module 30 is located between the skin patch 11 and the evaporation plate 50. One side of the thermoelectric power generation module 30 is in close contact with the patch module 10, continuously absorbing body temperature from the skin surface, thus forming a heat source side; its other side faces away from the patch module 10 to be close to or in contact with the evaporation plate 50, thus forming a cold source side. In this way, a reliable and renewable temperature gradient is established between the heat source side and the cold source side of the thermoelectric power generation module 30 by utilizing the body surface temperature and the ambient temperature. The thermoelectric power generation module 30 is composed of micro thermocouple pairs made of highly efficient thermoelectric materials such as bismuth telluride connected in series or parallel. These thermoelectric materials are encapsulated between thermally conductive ceramic substrates (such as alumina) and connected by metal conductive electrodes. Thus, according to the Seebeck effect, there is a temperature difference between the heat source side and the cold source side of the thermoelectric power generation module 30, and the internal charge carriers will move directionally, thereby directly generating a continuous direct current. The electrical energy generated by the thermoelectric power generation module 30 is delivered to the circuit module 20 to continuously power the circuit module 20.

[0061] Please see Figure 7The heat dissipation duct 40 is located on the skin patch 11, and the air outlet of the heat dissipation duct 40 is aligned with the cold source side of the thermoelectric generator module 30 to reduce the temperature of the cold source side of the thermoelectric generator module 30. When the sweat detection device 100 is worn by the user, when the ambient air flows or the user is moving, outside air can enter the heat dissipation duct 40. Guided by the heat dissipation duct 40, the air can flow through the cold source side of the thermoelectric generator module 30, thereby achieving the technical objective of reducing the temperature of the cold source side and increasing the temperature difference between the heat source side and the cold source side of the thermoelectric generator module 30. This is based on the technology of Seebeck. The increased temperature difference enhances the power generation of the thermoelectric generator module 30, thus continuously supplying power to the circuit module 20. Simultaneously, a capacitor can be installed on the circuit module 20, acting as a miniature energy buffer to receive and store the electrical energy generated by the thermoelectric generator module 30 in real time. The capacitor also helps to smooth out potential power fluctuations in the thermoelectric generator module. Furthermore, it provides instantaneous, stable power to the detection sensors, information processing units, and wireless communication units, meeting peak power requirements. Together with the thermoelectric generator module 30, this forms a self-sustaining, recharge-free power supply system.

[0062] Please see Figure 7 The heat dissipation groove 30a is a groove structure formed on the side of the thermoelectric power generation module 30 facing away from the surface mount module 10. The heat dissipation groove 30a can be an array of micro-grooves processed on the ceramic substrate of the cold end of the thermoelectric power generation module 30. The shape of the heat dissipation groove 30a can be designed as a parallel straight line, a serpentine shape, or a radial shape according to the airflow pattern, and is not limited here. When the heat dissipation duct 40 is a unidirectional dominant airflow, the parallel straight heat dissipation groove 30a can extend along the airflow direction, so that the airflow passes smoothly and achieves uniform and efficient flushing of the cold end surface. Of course, the heat dissipation groove 30a can also be set as a serpentine groove with a certain angle to the airflow direction to extend the airflow path and enhance heat exchange. At the same time, the sidewalls and bottom of the heat dissipation groove 30a expand the heat dissipation area of ​​the thermoelectric power generation module on the cold source side, which can ensure the static heat dissipation capacity of the thermoelectric power generation module when the sweat detection device 100 is in a resting state and there is no air cooling effect, thereby ensuring the power generation efficiency of the power generation module.

[0063] Please see Figure 7 and Figure 8Furthermore, the heat dissipation duct 40 includes a first air inlet section 40a and a second air inlet section 40b. The first air inlet section 40a is exposed within the patch module 10, and the second air inlet section 40b is located within the patch module 10. The outlet end of the second air inlet section 40b is connected to the heat dissipation slot 30a. The first air inlet section 40a refers to the flow segment in the heat dissipation duct 40 that can be observed by the user's naked eye, while the second air inlet section 40b refers to the flow segment in the heat dissipation duct 40 that cannot be observed by the user's naked eye. Specifically, the initial section of the first air inlet section 40a is located on the side of the patch module 10 and extends a certain distance towards the thermoelectric generator module 30 on the patch module 10. After extending a certain distance, the first air inlet section 40a begins to enter the cover plate, sealing plate, and other cover structures of the sweat detection device 100, thereby forming the second air inlet section 40b. The second air inlet section 40b is not visible to the user. At the same time, the thermoelectric generator module is located under the cover structure and is thus shielded by the cover structure, providing protection and sealing for the thermoelectric generator module. The air outlet of the second air inlet section 40b is connected to the heat dissipation slot 30a. In this way, the outside air can pass through the first air inlet section 40a, the second air inlet section 40b and the heat dissipation slot 30a in sequence, thereby removing the heat from the thermoelectric generator module at the heat dissipation slot 30a and reducing the temperature of the cold end side of the thermoelectric generator module.

[0064] The cross-sectional area of ​​the first air inlet section 40a and the second air inlet section 40b gradually decreases from the air inlet end to the air outlet end. The cross-sectional area of ​​the first air inlet section 40a and the second air inlet section 40b gradually decreases from the direction away from the heat dissipation slot 30a (i.e., the air inlet end) to the direction close to the heat dissipation slot 30a (i.e., the air outlet end), forming an integral gradually narrowing flow channel. When ambient air is naturally drawn in or induced by human movement into the spacious air intake end of the first air intake section 40a, the airflow velocity will continuously and steadily increase as the cross-section decreases when flowing through the gradually narrowing first air intake section 40a and second air intake section 40b. This means that when the airflow reaches the end of the second air intake section 40b and is about to enter the heat dissipation tank 30a, it has been accelerated from the initial, relatively slow ambient airflow into a high-speed, focused, and kinetic-concentrated high-speed air stream. In this way, the air can impact the surface of the heat dissipation tank 30a with greater momentum, significantly improving the intensity of forced convection heat transfer. At the same time, the high-speed air can generate stronger turbulence in the grooves of the heat dissipation tank 30a, completely destroying the thermal boundary layer and ensuring direct contact between the cold air and the hot surface. Thus, when the user is in a resting state, the ambient air can also be accelerated to impact the surface of the heat dissipation tank 30a, thereby reducing the temperature of the cold end side of the thermoelectric power generation module.

[0065] Please see Figure 13The evaporation plate 50 includes, in sequence, a traction layer 51, a diffusion layer 52, and an evaporation layer 53 along the direction from near the detection hole 10b to away from the detection hole 10b. The traction layer 51 is configured to absorb sweat located in the detection hole 10b; the diffusion layer 52 is configured to diffuse the area of ​​sweat; and the evaporation layer 53 is configured to evaporate sweat.

[0066] The traction layer 51 is made of hydrophilic material, such as a plasma-treated polymer film or a densely woven cotton layer. The liquid collection area of ​​the traction layer 51 serves as the first interface for sweat to enter the evaporation plate 50 from the detection hole 10b. It is micro-concave or has a dense array of micropillars to form a point of lowest capillary potential. The liquid collection area can actively and efficiently capture the sweat in the detection hole 10b, thereby overcoming the surface tension of the liquid and ensuring that the sweat is stably and completely absorbed into the evaporation plate 50. At the same time, it prevents droplets from seeping back or stagnating, providing a reliable initial liquid source for the subsequent transport process.

[0067] The diffusion layer 52 is located above the traction layer 51. On the side facing the traction layer 51, there is a core "capillary guide structure". In terms of morphology, the capillary guide structure is a convex ridge or thickened fiber bundle array that extends radially from the corresponding liquid collection area to the periphery. It is integrally formed by molding or weaving a material with a high capillary coefficient (such as a carbon fiber / cotton yarn composite with a specific weaving density). Its function is to act as a "high-speed trunk line" for liquid transport. By using strong directional capillary force, it rapidly and directionally transports the sweat collected in the liquid collection area to the edge area of ​​the evaporation plate 50, realizing the rapid area expansion of liquid on a two-dimensional plane. This solves the efficiency bottleneck of point source to area diffusion and lays the area foundation for uniform evaporation.

[0068] The evaporation layer 53 is located on the outermost layer, and its side facing the diffusion layer 52 is processed with a fine "micro-groove network". The cross-section of these grooves is shaped like a triangle or a triangle, and the depth is on the micrometer scale. The dominant extension direction of these grooves is not parallel to the airflow direction of the heat dissipation duct 40, and the two can be at an angle of 1 degree. The starting ends of some micro-grooves are precisely connected to the ends of the capillary guide structure of the diffusion layer 52 below, forming a seamless connection of the capillary path. The evaporation layer 53 is composed of a fluffy porous material (such as open-cell foam, non-woven fabric, or cotton wool). It "receives" the liquid from the diffusion layer 52 through the micro-grooves and completes the final distribution of the liquid, allowing the liquid to wet its huge inner surface area. At the same time, the micro-grooves and the porous body together construct a gas-liquid exchange interface. When the airflow passes through, the micro-grooves can induce turbulence and destroy the boundary layer, thereby enabling the liquid film on its surface to undergo efficient and continuous phase change evaporation, making full use of the latent heat absorption capacity of sweat, and realizing the cooling of the thermoelectric power generation module.

[0069] The evaporator plate 50, through its three-layer functional structure consisting of a traction layer 51, a diffusion layer 52, and an evaporation layer 53, combined with the heat dissipation duct 40, jointly achieves a highly efficient and synergistic dual cooling system: the traction layer 51 directly connects to the detection hole 10b, actively drawing in sweat using high capillary force to ensure smooth liquid introduction; the diffusion layer 52 rapidly spreads the liquid flow laterally across the entire evaporator plate 50 area, providing a large evaporation area for the sweat evaporation process; the evaporation layer 53, through its porous structure, maximizes the gas-liquid interface, allowing sweat to continuously evaporate and absorb a large amount of latent heat; simultaneously, the second air inlet section 40b of the heat dissipation duct 40 is positioned to penetrate the cold end of the thermoelectric power generation module 30. Between the evaporator plate 50 and the bottom surface of the evaporator plate 50, the airflow, after being gradually compressed and accelerated, can simultaneously scour the heat dissipation groove 30a of the thermoelectric power generation module 30 and flow through the base of the evaporator plate 50, so that the heat absorption process of sweat evaporation and the forced air cooling process are spatially coupled. The evaporator plate 50 maintains a low temperature due to continuous evaporation, thus providing an additional, stable low-temperature heat sink for the cold end of the thermoelectric power generation module 30 that is attached to it. Meanwhile, the airflow of the heat dissipation duct 40 carries away the waste heat generated by the thermoelectric power generation module 30 on the cold source side and the heat conducted by the evaporator plate 50, forming a superposition effect of "evaporative cooling" and "air cooling", thereby reducing the temperature of the cold source side of the thermoelectric power generation module 30.

[0070] Please refer to Figure 9 , Figure 10 as well as Figure 13 The sweat flow path is as follows: sweat on the skin surface is first absorbed by the sweat collection microchannel 10a of the patch module 10, flows within the sweat collection microchannel 10a, and when the sweat reaches the end of the sweat collection microchannel 10a, it is drawn in by the capillary action of the detection hole 10b, then enters the detection hole 10b, and flows along the channel of the detection hole 10b to the detection end of the detection sensor for sweat target detection; after the sweat reaches the top of the detection hole 10b, it can be captured by the traction layer 51 and then transported to the diffusion layer 52 thereon. The diffusion layer 52 is woven from a mixture of coarse carbon fiber and cotton thread, forming a highly efficient, low-resistance capillary network, the function of which is... The system can rapidly and evenly diffuse the point-like liquid flow from the traction layer 51 laterally to most of the area of ​​the evaporation plate 50, thereby creating a broad and uniform wet area for subsequent evaporation. Finally, the sweat seeps into the uppermost evaporation layer 53, which has a porous and fluffy structure (like cotton wool). The sweat spreads out fully here to form an extremely thin liquid film, and under the action of the air flowing over the surface of the evaporation plate 50, it continues to undergo phase change evaporation. This process absorbs a large amount of latent heat, thereby continuously and effectively reducing the overall temperature of the evaporation plate 50, and exchanging heat with the cold source side of the thermoelectric power generation module 30 below, achieving deep cooling of the cold source side of the thermoelectric power generation module 30.

[0071] Please see 11 and Figure 12The airflow path is as follows: After the ambient air enters the first air intake section 40a, because the evaporator plate 50 is exposed in the first air intake section 40a, the air can be split at the end of the first air intake section 40a. Part of the air enters the second air intake section 40b, the heat dissipation trough 30a, and the cold source side of the thermoelectric power generation module 30 for air cooling. The other part of the air flows along the surface of the evaporator plate 50, especially the fluffy porous structure area of ​​the evaporation layer 53. Because the evaporation layer 53 has a large specific surface area and open pores, this part of the airflow can fully penetrate and wash away the sweat film maintained by capillary action on its surface and in the shallow pores, quickly carrying away the water vapor generated by evaporation, thereby continuously maintaining a low vapor partial pressure and temperature on the surface of the evaporation layer 53, so that its evaporation heat absorption process is always kept at a high rate.

[0072] Please see Figure 8 A thermal insulation layer 60 is located between the circuit module 20 and the thermoelectric power generation module 30. It is configured to block the transfer of Joule heating from the circuit module 20 to the thermoelectric power generation module 30. The thermal insulation layer 60 is made of a lightweight material with low thermal conductivity, such as aerogel composite material, vacuum insulation panel, or foamed polymer. The thermal insulation layer 60 forms an efficient thermal barrier between the circuit module 20 and the thermoelectric power generation module 30. By setting the thermal insulation layer 60, it is ensured that the cold source side of the thermoelectric power generation module 30 does not actively absorb heat, thereby ensuring the temperature difference between the cold source side and the hot source side of the thermoelectric power generation module 30.

[0073] To further improve the efficiency of heat utilization generated by circuit module 20, please refer to Figure 8 The sweat detection device 100 also includes a thermal bridge 61, which is disposed through a thermal insulation layer 60; one end of the thermal bridge 61 is disposed near the circuit module 20, and the other end of the thermal bridge 61 is disposed near the heat source side of the thermoelectric power generation module 30.

[0074] In this embodiment, the thermal bridge 61 is a thermal management component that runs through the thermal insulation layer 60. It is made of a high thermal conductivity material (such as oxygen-free copper, micro heat pipes, or highly oriented graphite) and is usually cylindrical or square in shape. It is inserted into the thermal insulation layer 60 in a fitted manner, that is, through holes are opened at predetermined positions in the thermal insulation layer 60, the thermal bridge 61 is embedded in them, and a flexible thermal insulation sealing ring with low thermal conductivity is filled between its outer wall and the hole wall. This ensures efficient axial heat conduction while completely blocking radial leakage of heat to the thermal insulation layer 60 body, forming a "controllable heat pipe in the insulation layer". One end of the thermal bridge 61 is tightly connected to the heating element of the circuit module 20, and the other end is attached to the heat source side of the thermoelectric power generation module 30, thereby constructing a path to guide the waste heat of the circuit to the heat source side of the thermoelectric power generation module. The waste heat of the circuit is used to heat the heat source side of the thermoelectric power generation module, thereby increasing the temperature difference between the hot and cold surfaces of the thermoelectric power generation module and improving the power generation efficiency of the thermoelectric power generation capability.

[0075] In one embodiment of the present invention, please refer to 7, the sweat detection device 100 further includes a fixing member 70, which is fixedly connected to the patch module 10; the fixing member 70 is configured to fix the sweat detection device 100 to the skin so that the patch module 10 fits the skin.

[0076] It is understandable that the fastener 70 can be made of different forms and materials depending on the application site and wearing requirements. In one embodiment, as shown in the figure, the fastener 70 can be a double-sided adhesive structure fixed to the bottom of the patch module 10. The double-sided adhesive is usually made of hypoallergenic, breathable medical-grade pressure-sensitive adhesive. One side is firmly attached to the back of the patch module 10, while the other side has a peelable protective layer. During use, it is directly applied to the skin surface, such as the neck or other flat areas with relatively little movement, to achieve convenient and discreet fixation. Based on this, the double-sided adhesive structure has clearance gaps that align with the sweat collection microchannels of the patch module 10. 10a, so that sweat can be smoothly drawn to the sweat collection microchannel 10a; in another embodiment, the fastener 70 is two straps, each strap including a fixed end and a free end. The fixed end of each strap is fixedly connected to the patch module 10, and the free end can be fixedly connected to the free end of the other strap by buckle or adhesive, so as to achieve a more secure wearing, suitable for parts with a large range of motion such as the arms. As for the specific type of fastener 70, it is only necessary to ensure that the patch module 10 can fit the skin, and there is no limitation here.

[0077] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural transformations made using the contents of the specification and drawings of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of patent protection of the present invention.

Claims

1. A method for continuous detection of sweat, characterized in that, The continuous sweat detection method proposes a sweat detection device, which includes a sweat collection microchannel, a detection hole, a detection sensor, and an evaporation plate. The detection hole communicates with the sweat collection microchannel, and at least a portion of the evaporation plate is aligned with the detection hole. The method includes: The sweat detection device uses a microchannel to absorb sweat from the skin surface. The detection orifice absorbs sweat located at the end of the sweat collection microchannel; The detection sensor located in the detection hole detects sweat at its detection end; The evaporation plate absorbs sweat located in the detection hole for evaporation; The sweat collection microchannel continuously absorbs sweat from the skin based on the evaporation of the evaporation plate.

2. The method according to claim 1, characterized in that, The sweat detection device further includes a thermoelectric generator module, which is disposed between the sweat collection microchannel and the evaporation plate. The method further includes: The thermoelectric power generation module uses the temperature conducted by the sweat collection microchannel as the hot end of the thermoelectric power generation module and the temperature maintained by the evaporation plate due to sweat evaporation as the cold end of the thermoelectric power generation module, so as to create a temperature difference on both sides of the thermoelectric power generation module to generate electricity. The thermoelectric power generation module supplies the generated electrical energy to the detection sensor.

3. The method according to claim 2, characterized in that, The sweat detection device further includes a heat dissipation duct, at least a portion of which passes between the evaporation plate and the cold end of the thermoelectric generator module. The method further includes: External air flows through the aforementioned heat dissipation duct; At least a portion of the air in the heat dissipation duct flows through the cold end of the thermoelectric power generation module to reduce the cold end temperature of the thermoelectric power generation module.

4. The method according to claim 3, characterized in that, The cross-section of the heat dissipation duct gradually narrows along the airflow direction, so that the air in the heat dissipation duct accelerates and washes over the cold end of the thermoelectric power generation module.

5. The method according to claim 3, characterized in that, After the step of external air flowing through the heat dissipation duct, the method further includes: At least a portion of the air in the heat dissipation duct flows over the surface of the evaporation plate to carry away the water vapor generated by the evaporation of sweat.

6. The method according to any one of claims 2 to 5, characterized in that, The evaporation plate includes a traction layer, a diffusion layer, and an evaporation layer. The traction layer has a liquid collection area, the diffusion layer has a capillary guiding structure, and the evaporation layer has microgrooves. The step of the evaporation plate absorbing sweat located in the detection hole for evaporation includes: The liquid collection area of ​​the traction layer absorbs the sweat located in the detection hole; The diffusion layer capillary structure diffuses the sweat located in the liquid collection area; The micro-grooves of the evaporation layer spread sweat into a liquid film for evaporation.

7. The method according to claim 6, characterized in that, The method further includes: The circuit module containing the detection sensor is thermally isolated from the thermoelectric power generation module to prevent the heat generated by the circuit module during operation from being transferred to the cold end of the thermoelectric power generation module.

8. The method according to claim 7, characterized in that, The sweat detection device further includes a thermal bridge, and the method further includes: The thermal bridge transfers the heat generated by the circuit module during operation to the hot end of the thermoelectric generator module.

9. The method according to claim 8, characterized in that, The sweat detection device further includes a heat-conducting column, and the method further includes: The heat-conducting pillars transfer the heat generated by the circuit module during operation to the evaporation layer of the evaporation plate.

10. A sweat detection device for implementing the continuous sweat detection method as described in any one of claims 1 to 9, characterized in that, The sweat detection device includes: A patch module, wherein the patch module is provided with a sweat collection microchannel and a detection hole communicating with the sweat collection microchannel; A circuit module, wherein the circuit module is disposed on the surface mount module, the circuit module having a detection sensor, the detection end of the detection sensor being located in the detection hole; and An evaporation plate is disposed on the patch module and at least adheres to the detection hole area. The evaporation plate is configured to absorb sweat located in the detection hole for sweat evaporation.

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