CN116725485A - Embedded fabric-based flexible wearable liquid sensor and detection method - Google Patents
Embedded fabric-based flexible wearable liquid sensor and detection method Download PDFInfo
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/42—Detecting, measuring or recording for evaluating the gastrointestinal, the endocrine or the exocrine systems
- A61B5/4261—Evaluating exocrine secretion production
- A61B5/4266—Evaluating exocrine secretion production sweat secretion
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/6802—Sensor mounted on worn items
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/28—Electrolytic cell components
- G01N27/30—Electrodes, e.g. test electrodes; Half-cells
- G01N27/327—Biochemical electrodes, e.g. electrical or mechanical details for in vitro measurements
- G01N27/3271—Amperometric enzyme electrodes for analytes in body fluids, e.g. glucose in blood
- G01N27/3272—Test elements therefor, i.e. disposable laminated substrates with electrodes, reagent and channels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/28—Electrolytic cell components
- G01N27/30—Electrodes, e.g. test electrodes; Half-cells
- G01N27/327—Biochemical electrodes, e.g. electrical or mechanical details for in vitro measurements
- G01N27/3271—Amperometric enzyme electrodes for analytes in body fluids, e.g. glucose in blood
- G01N27/3273—Devices therefor, e.g. test element readers, circuitry
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Molecular Biology (AREA)
- Chemical & Material Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Pathology (AREA)
- Biophysics (AREA)
- Animal Behavior & Ethology (AREA)
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- Immunology (AREA)
- General Physics & Mathematics (AREA)
- Public Health (AREA)
- Biomedical Technology (AREA)
- Hematology (AREA)
- Biochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Analytical Chemistry (AREA)
- Endocrinology (AREA)
- Gastroenterology & Hepatology (AREA)
- Physiology (AREA)
- Measuring And Recording Apparatus For Diagnosis (AREA)
- Investigating Or Analysing Biological Materials (AREA)
Abstract
The invention relates to an embedded fabric-based flexible wearable liquid sensor and a detection method, comprising the following steps: fretwork microchannel sensing unit includes: a collecting chamber directly attached to the skin surface for collecting sweat generated from the skin surface; the micro flow channel is communicated with the collecting chamber and is used for containing the liquid which is continuously generated, so that the liquid is continuously discharged outwards through the micro flow channel; and the detection mechanism is used for detecting sweat flowing through the micro flow channel and comprises an electrode, and the electrode is at least partially exposed in the micro flow channel and can be in contact with liquid flowing through the micro flow channel. The hollowed micro-channel sensing unit is embedded and packaged in the fabric, the sensor is worn on the surface of the skin, sweat can not be normally secreted and permeate the fabric, accumulation of sweat is effectively avoided, and testing accuracy is guaranteed.
Description
Technical Field
The invention relates to the technical field of sensors, in particular to an embedded fabric-based flexible wearable liquid sensor and a detection method.
Background
With the ever-increasing trend toward global warming, extremely high temperature mats are being rolled around the world. More and more outdoor staff suffer from high-temperature environments, heatstroke symptoms occur, and life health is even endangered due to 'heat shooting disease'. The heat-jet disease is caused by high temperature, the body temperature of the human body is regulated to be dysfunctional, and the heat in the human body is excessively accumulated, so that the damage of nerve organs is caused. The heat-shooting disease is the most serious heatstroke type, the death rate is between 20 and 70 percent, and the elderly patients can reach 80 percent.
Under normal conditions, the human body can regulate the body temperature balance by expanding skin blood vessels and sweating, and along with the rise of temperature, the skin sweating speed is accelerated to discharge heat accumulated in the body, but sweat glands can not reach the body temperature balance even through a large amount of sweat in a high-temperature environment for a long time, and various life-threatening health symptoms can occur. Early identification is of great importance because damage to body organs from high temperatures is irreversible and difficult to treat once the heat-shooting disease is initiated. The dehydration caused by a large amount of perspiration is an early significant feature of the heat-shock disease, and the occurrence of the accidents can be avoided if the perspiration and dehydration condition of the human body can be timely identified. The dehydration degree is different, so that the water and salt metabolism disorder of the human body can be caused, various bad symptoms can appear, researches show that the dehydration degree has correlation with the athletic performance of the human body, and therefore, if a wearable device capable of detecting the sweat speed and the electrolyte concentration change of the human body in real time can be developed, the dehydration state can be accurately estimated, feedback and early warning can be timely provided, and various accidents can be avoided.
Various forms of wearable sweat sensors have been reported but there are still some problems in practical applications. The wrist strap is designed into a soft and hard combination mode such as a bracelet or a wrist strap, is uncomfortable to wear and needs to be tightly fixed on a human body; another type of paper-based or patch-type sensor based on colorimetry and dye color change is disposable and cannot be reused. Therefore, in practical applications, there is an urgent need to develop a sensor that is simple to manufacture, has high stability, is compatible with clothing, is comfortable to wear, and is reusable.
Disclosure of Invention
The invention provides an embedded fabric-based flexible wearable liquid sensor and a detection method, which are used for guaranteeing the accuracy and the real-time performance of a test and are not interfered by the concentration of sweat electrolyte.
The specific technical scheme is as follows: an embedded fabric-based flexible wearable liquid sensor, comprising: hollowed-out micro flow channel sensing unit, it includes:
a collecting chamber directly attached to the skin surface for collecting sweat generated from the skin surface;
the micro flow channel is communicated with the collecting chamber and is used for containing the liquid which is continuously generated, so that the liquid is continuously discharged outwards through the micro flow channel;
and the detection mechanism is used for detecting sweat flowing through the micro flow channel and comprises an electrode, and the electrode is at least partially exposed in the micro flow channel and can be in contact with liquid flowing through the micro flow channel.
In some embodiments, the detection mechanism includes at least one pair of electrolyte concentration detection electrodes and a pair of sweat rate detection electrodes, each pair of electrodes being at least partially exposed within the microchannel and capable of contacting sweat flowing through the microchannel.
In some embodiments, one end of the electrolyte concentration detection electrode is exposed in the microchannel opposite to the collection chamber, and the sweat speed detection electrode has an interdigital electrode, and an "interdigital" of the interdigital electrode is exposed in the microchannel.
In some embodiments, the electrolyte concentration detection electrode comprises a first electrode and a second electrode, wherein one ends of the first electrode and the second electrode are exposed at the inlet of the micro-channel and are positioned on the inner surface of the packaging layer at the top of the micro-channel and are opposite to the collecting chamber.
In some embodiments, a sweat storage chamber is provided in the collection chamber, and a sweat channel is provided in the microchannel, one end of which communicates with the collection chamber.
In some embodiments, the wearable liquid sensor comprises a flexible substrate layer and a micro-channel top packaging layer, wherein the flexible substrate layer is attached to the collecting chamber, the electrodes are arranged in the micro-channel top packaging layer, the collecting chamber, the micro-channel, the electrodes and the micro-channel top packaging layer are sequentially arranged along the direction away from the surface of the skin, through holes are formed in the flexible substrate layer and are communicated with the collecting chamber, and the micro-channel is communicated with the collecting chamber through the through holes.
In some embodiments, the wearable liquid sensor is a serpentine, straight, or spiral structure.
A method of detecting a wearable liquid sensor, comprising the steps of:
placing the wearable liquid sensor in a selected area;
and continuously collecting and analyzing the conductance signals generated by the wearable sweat sensor to detect the concentration of the liquid electrolyte and the liquid outlet speed in the selected area, and analyzing the step conductance signals generated by the interdigital electrodes for detecting the liquid outlet speed to detect the liquid speed in the selected area.
In some embodiments, continuous conductivity values generated by sweat concentration changes are recorded in real time through a conductivity detection instrument, a real-time continuous conductivity curve is formed, and real-time continuous electrolyte total concentration and liquid outlet speed information is obtained.
In some embodiments, the conductance step signal is generated as the liquid flows through the "fingers" of each finger electrode, and the sweat rate can be calculated simply by detecting the time interval of each step signal.
The invention has the technical effects that: (1) Through setting up sweat microchannel, carry out electrolyte concentration and detect in sweat microchannel entrance, sweat sample volume is tiny, and sweat after the detection can be rapidly through the microchannel drainage, does not have sweat accumulation, guarantees the accuracy of test. (2) By arranging the sweat micro-flow channel, sweat is continuously communicated with the interdigital electrodes in the flowing process of the sweat in the micro-flow channel to generate a conductance step signal, and the real-time continuous detection of the sweat speed can be realized by analyzing the time length corresponding to the step signal without being interfered by the concentration of sweat electrolyte. (3) The hollowed micro-channel sensing unit is embedded and packaged in the fabric, the sensor is worn on the surface of the skin, sweat can not be normally secreted and permeate the fabric, accumulation of sweat is effectively avoided, and the accuracy of testing is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic cross-sectional view of an inlet of an embedded fabric-based flexible wearable liquid sensor according to an embodiment of the present invention when the sensor is attached to a skin surface.
Fig. 2 is a top view of an embedded fabric-based flexible wearable liquid sensor provided by an embodiment of the invention.
Fig. 3 is a schematic cross-sectional view of a microchannel according to an embodiment of the invention.
Fig. 4 is a graph of a conductivity signal for detecting electrolyte concentration when an embedded fabric-based flexible wearable liquid sensor provided by an embodiment of the invention is tested on human skin.
Fig. 5 is a graph of a conductance step signal of an embedded fabric-based flexible wearable liquid sensor provided by an embodiment of the invention to detect sweat velocity under microfluidic syringe pump test conditions.
Fig. 6 is a real-time sweat rate change curve obtained by analyzing the obtained conductance step signal (fig. 6) information of a flexible wearable sweat sensor device for detecting sweat rate and concentration of sweat electrolyte provided in embodiment 1 of the present invention.
Reference numerals: 1-human skin sweating system; 11-sweat glands; 12-hypodermis; 13-skin epidermis; 2-a collection chamber; 3-a flexible substrate layer; 4-a micro-channel main body structure layer; 5-a microchannel top packaging layer; 6-sweat velocity detection electrode; 61-detecting the sweat velocity of the first electrode; 62-detecting the sweat velocity of the second electrode; 7-an electrolyte concentration detection electrode; 71-detecting the electrolyte concentration of the first electrode; 72-detecting the electrolyte concentration of the second electrode; 8-micro flow channel.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
The embedded fabric-based flexible wearable liquid sensor is used for detecting sweat electrolyte concentration and sweat velocity, can be embedded into fabrics, clothes, cloth, wrist bands and the like, is attached to the surface of skin, and can be integrated and compatible with the fabrics such as sports tights, wrists, palms, elbows, sweat-absorbing bands, sweat-absorbing patches and the like. The present embodiment will be described with reference to the example of detection of human sweat.
As shown in fig. 1 to 6, the embedded fabric-based flexible wearable liquid sensor of the present embodiment includes a hollowed-out micro channel sensing unit, which includes: a collecting chamber 2, which is directly attached to the skin surface, for collecting sweat generated from the skin surface. And a micro flow channel 8, which is communicated with the collecting chamber 2 and is used for containing sweat generated continuously, so that sweat generated on the surface of the skin is continuously discharged outwards through the micro flow channel 8. The micro flow channel 8 is arranged in the micro flow channel main body structure layer 4, and the detection mechanism is used for detecting sweat flowing through the micro flow channel so as to acquire electrolyte concentration and sweat velocity information in the sweat. The detection mechanism includes an electrode at least partially exposed within the microchannel and capable of contacting sweat flowing through the microchannel. Through above-mentioned technical scheme, the flexible wearable liquid sensor of embedded fabric base can not influence sweat and normally secrete and permeate the fabric, effectively avoids the accumulation of sweat, and the accuracy is high, and through the sweat of manual discharge collection moreover, detection device repeatedly usable need not the calibration. In this embodiment, the inner wall of the micro flow channel is hydrophilic.
In this embodiment, the detection means comprises at least one pair of electrolyte concentration detection electrodes 7 and one pair of sweat velocity detection electrodes 6, each pair of electrodes being at least partially exposed within the microchannel 8 and capable of contacting sweat flowing through the microchannel. One end of the electrolyte concentration detection electrode 7 is exposed in the micro-flow channel 8 and is opposite to the collecting chamber 2, and the sweat velocity detection electrode is provided with an interdigital electrode, and an interdigital of the interdigital electrode is exposed in the micro-flow channel. The electrolyte concentration detection electrode 7 comprises a first electrode 71 and a second electrode 72, one ends of the first electrode 71 and the second electrode 72 are exposed at the inlet of the micro-channel 8 and are positioned on the inner surface of the micro-channel top packaging layer 5 and are opposite to the collection chamber 2. The "fingers" of the first electrode 61 and the second electrode 62 of the sweat speed detection electrode 6 are exposed in the micro flow channel and are located on the inner surface of the micro flow channel top encapsulation layer 5. The sweat collecting chamber is internally provided with a sweat storage chamber, the micro-flow channel is internally provided with a sweat channel, and one end of the sweat channel is communicated with the collecting chamber.
In this embodiment, the wearable liquid sensor includes a flexible substrate layer 3 and a micro-channel top packaging layer 5 attached to the collecting chamber 2, the electrodes are disposed in the micro-channel top packaging layer 5, the collecting chamber 2, the micro-channel, the electrodes and the micro-channel top packaging layer 5 are sequentially disposed along a direction far away from the surface of the skin, the flexible substrate layer 3 is provided with a through hole which is communicated with the collecting chamber 2, the micro-channel is communicated with the collecting chamber 2, the aperture of the through hole is 1-10 mm, and a through hole corresponding to the position of the collecting chamber can be prepared on the flexible substrate layer by a laser cutting, template or mechanical punching method, so that sweat flows into the micro-channel 8 from the through hole, and the inner wall of the through hole is hydrophilic.
In the technical scheme, the thickness of the micro-channel main structure layer 4 is 0.05-0.3 mm, the width of the micro-channel is 0.05-3 mm, the thickness of the sweat speed detection electrode 6 and the thickness of the sweat electrolyte concentration detection electrode 7 are thin film electrodes, and the thickness is 0.01-0.5 mm. When the sweat sensor is specifically used, the wearable sweat sensor device in the embodiment is attached to the skin epidermis 13, and sweat is secreted from sweat gland 11 to have certain pressure, and the maximum pressure can reach 70000N m -2 Sufficient to pump sweat into the collection chamber 2; when sweat accumulates in the collecting chamber 2 to a certain amount, the sweat enters the micro-channel through the through hole on the flexible substrate layer 3, the electrolyte concentration detecting electrode 7 exposed on the inner surface of the top packaging layer 5 is contacted at the inlet, the electrolyte concentration detecting first electrode 71 and the electrolyte concentration detecting second electrode 72 are connected with the conductance detecting instrument or the wearable miniature detecting device through the exposed pins so as to obtain the conductance signal of the wearable sweat sensor device in real time, the conductance detecting instrument records the continuous conductance value generated by the sweat concentration change in real time to form a real-time continuous conductance curve as shown in fig. 4, when the conductance curve signal starts to be suddenly changed, the sweat starts to be secreted by the human skin, and the height or the amplitude of the continuous conductance curve is positively correlated with the total concentration of sweat electrolyte at the inlet of the micro-channel. Thus, a real-time continuous change in sweat electrolyte concentration can be obtained through a real-time continuous conductance curve. As sweat continues to flow forward through the microchannel inlet and fills, it will continuously contact the "fingers" of the sweat velocity detection electrode 6, and be recorded by the conductivity detection instrument as shown in fig. 5The change signal of the conductance step, the corresponding time length of the step, namely the time taken for flowing through the micro-channel volume between the adjacent 'interdigital', can obtain the sweat velocity information through analysis and calculation.
The conducting wires for connecting the electrode pins with the conductivity detection instrument and equipment can be flexible conductive carbon cloth, fiber conducting wires and the like, and are embedded into the devices such as fabrics and the like. It should be noted that the wearable sweat sensor of the present embodiment may also be used for electrolyte concentration testing of other solutions, for example, the liquid to be detected may be pumped into the collection chamber of the wearable sweat sensor device by a micro-fluid injection pump, and then the electrolyte concentration information of the detected liquid is analyzed according to the same principle, i.e. according to the obtained conductivity curve. The wearable sweat sensor device of the present embodiment can also be used for flow rate testing of other microfluidics, for example, the liquid to be detected can be pumped into the collection chamber of the wearable sweat sensor device by a microfluidic syringe pump, and then the flow rate information of the detected liquid is analyzed according to the same principle, i.e. according to the obtained conductance step signal.
In this embodiment, the flexible substrate layer, the micro flow channel main body structure layer and the micro flow channel top packaging layer material include flexible insulating polymer films, and the flexible insulating polymer is polydimethylsiloxane, silicone rubber or thermoplastic polyester. The conductive electrode is made of carbon nano tube, graphene, carbon black, carbon fiber and conductive silver paste; the material of the conductive electrode can also be a film electrode with certain thickness and width made of other materials such as metal for conductivity test such as gold, platinum, copper and the like; the preferable conductive electrode is a thin film electrode with the thickness of 0.01-0.3 mm, and the preparation method of the conductive electrode comprises magnetron sputtering, screen printing, spraying, knife coating and ink-jet printing. The sweat speed detection electrode at least comprises a pair of 'interdigital', and two or more pairs of 'interdigital' numbers can be arranged according to the length of the micro-flow channel and the detection range. The sweat velocity detection electrode is not affected by the change of sweat electrolyte concentration, and can accurately detect the change of sweat velocity in real time. The flexible substrate layer, the micro-channel main body structure layer and the micro-channel top packaging layer can be directly prepared by adopting hydrophilic materials, and hydrophilicity can be realized by adopting earlier treatment, for example, plasma treatment can be adopted to treat the inner surface of the micro-channel before the device is assembled so as to realize hydrophilicity. The flexible substrate layer, the micro-channel main body structure layer and the top packaging layer are combined together through adhesive materials, the flexible substrate layer, the micro-channel main body structure layer and the top packaging layer comprise ultrathin double faced adhesive tapes with fixed thickness, prepolymer of viscoelastic polymer and the like, and the thickness of the adhesive film is 0.001-0.05 mm. In another embodiment, surface modification by chemical agents can also be used to achieve intimate bonding between adjacent layers, such as by intimately bonding the polydimethylsiloxane microchannel host structure to the top encapsulation layer after silane agent treatment and Plasma treatment.
The wearable liquid sensor of this embodiment is in other suitable configurations, such as serpentine, straight or spiral configurations. The embedded wearable liquid sensing device provided by the embodiment is provided with the snakelike micro-channel, and the micro-channel is internally provided with the interdigital electrode for conducting signal detection, so that the concentration of sweat electrolyte and the sweat speed can be continuously detected in real time.
A method of detecting a wearable liquid sensor, comprising the steps of: placing a wearable liquid sensor on a selected skin surface area; and continuously collecting and analyzing the conductance signals generated by the wearable sweat sensor to detect the sweat electrolyte concentration and the sweat velocity in the selected skin surface area, and analyzing the step conductance signals generated by the interdigital electrodes for detecting the sweat velocity to detect the sweat velocity in the selected skin surface area.
Specifically, an instrument device for detecting solution conductivity or a wearable miniaturized detection device can be used for connecting electrode pins of the electrode layer, necessary flexible wire interface design and electrical insulation packaging treatment are performed, so that a conductivity signal of the wearable sweat sensor device is obtained in real time, a conductivity curve is formed, and real-time continuous electrolyte total concentration and sweat velocity information is obtained through conductivity curve analysis.
Wherein, the sweat electrolyte concentration conductivity curve is continuously changed, the signal of the conductivity curve is suddenly changed to represent that the skin of the human body starts to secrete sweat, and the value of the conductivity signal is positively correlated with the real-time electrolyte concentration of the sweat. The electric conduction signal generated by the sweat speed detection electrode is changed in steps, the time length of each step of the electric conduction signal corresponds to the time for sweat to fill the volume between two adjacent 'interdigital' in the micro-flow channel, and the sweat speed can be obtained through calculation.
Therefore, the sensor device of the embodiment can obtain the real-time sweat electrolyte concentration change information by obtaining the conductance curve of the sweat electrolyte concentration electrode in real time, and the accuracy is high. The wearable sweat sensor device provided by the invention can obtain the real-time conductance step signal of the sweat speed detection electrode, the information of the real-time sweat speed change can be obtained through analysis and calculation, and the detection result is not interfered by the sweat electrolyte concentration change.
While the present invention has been described above with reference to the embedded fabric-based flexible wearable liquid sensor and the detection method, the present invention is not limited to the above-described specific embodiments, and various modifications and changes may be made without departing from the scope of the claims. The present invention includes various modifications and alterations within the scope of the claims.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be appreciated by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. An embedded fabric-based flexible wearable liquid sensor, comprising: hollowed-out micro flow channel sensing unit, it includes:
a collecting chamber directly attached to the skin surface for collecting sweat generated from the skin surface;
the micro flow channel is communicated with the collecting chamber and is used for containing the liquid which is continuously generated, so that the liquid is continuously discharged outwards through the micro flow channel;
and the detection mechanism is used for detecting sweat flowing through the micro flow channel and comprises an electrode, and the electrode is at least partially exposed in the micro flow channel and can be in contact with liquid flowing through the micro flow channel.
2. The embedded fabric-based flexible wearable liquid sensor of claim 1, wherein the detection mechanism comprises at least one pair of electrolyte concentration detection electrodes and a pair of sweat velocity detection electrodes, each pair of electrodes being at least partially exposed within the microchannel and capable of contacting sweat flowing through the microchannel.
3. The embedded fabric-based flexible wearable liquid sensor of claim 2, wherein one end of the electrolyte concentration detection electrode is exposed in the microchannel opposite the collection chamber, the sweat speed detection electrode having an interdigitated electrode, the "interdigitated" of the interdigitated electrode being exposed in the microchannel.
4. The embedded fabric-based flexible wearable liquid sensor of claim 3, wherein the electrolyte concentration detection electrode comprises a first electrode and a second electrode, one ends of the first electrode and the second electrode are exposed at the inlet of the micro-channel and are positioned on the inner surface of the packaging layer at the top of the micro-channel and are opposite to the collection chamber.
5. The embedded fabric-based flexible wearable liquid sensor of claim 1, wherein a sweat storage chamber is provided in the collection chamber, and a sweat channel is provided in the microchannel, one end of which communicates with the collection chamber.
6. The embedded fabric-based flexible wearable liquid sensor of claim 5, wherein the wearable liquid sensor comprises a flexible substrate layer and a micro-channel top packaging layer, wherein the flexible substrate layer is attached to the collection chamber, the electrodes are arranged in the micro-channel top packaging layer, the collection chamber, the micro-channel, the electrodes and the micro-channel top packaging layer are sequentially arranged along the direction away from the surface of the skin, through holes are formed in the flexible substrate layer and are communicated with the collection chamber, and the micro-channel is communicated with the collection chamber through the through holes.
7. The embedded fabric-based flexible wearable liquid sensor of claim 1, wherein the wearable liquid sensor is a serpentine, straight or spiral structure.
8. A method of detecting a wearable liquid sensor, comprising the steps of:
placing the wearable liquid sensor of any of claims 1-7 in a selected area; and continuously collecting and analyzing the conductance signals generated by the wearable sweat sensor to detect the concentration of the liquid electrolyte and the liquid outlet speed in the selected area, and analyzing the step conductance signals generated by the interdigital electrodes for detecting the liquid outlet speed to detect the liquid speed in the selected area.
9. The method for detecting the wearable liquid sensor according to claim 8, wherein continuous conductivity values generated by sweat concentration change are recorded in real time through a conductivity detection instrument, a real-time continuous conductivity curve is formed, and real-time continuous electrolyte total concentration and liquid outlet speed information is obtained.
10. The method of claim 9, wherein the conductance step signal is generated as the liquid flows through the "fingers" of each finger electrode, and the sweat rate is calculated by detecting the time interval of each step signal.
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