Wearable sweat monitoring system

Abstract

The wearable sweat monitoring system comprises a sweat collector and a wireless signal receiving host, the sweat collector comprises a sweat sensing chip and a sweat collecting host, and a Na ion detection electrode, a K ion detection electrode, a reference electrode, three bent wires and three welding wire electrodes are arranged on a flexible substrate of the sweat sensing chip. One end of the first bent wire is connected with the Na ion detection electrode and the other end is connected with the first welding wire electrode; one end of the second bent wire is connected with the reference electrode and the other end is connected with the second welding wire electrode; one end of the third bent wire is connected with the K ion detection electrode and the other end is connected with the third welding wire electrode; a sweat signal acquisition circuit is arranged in a host shell of the sweat acquisition host; the sweat signal acquisition circuit is connected with three welding wire electrodes; the sweat signal acquisition circuit acquires the concentrations of sodium ions and potassium ions in sweat on the skin surface through a sweat acquisition chip; and the wireless signal receiving host is used for transmitting the concentrations of the sodium ions and the potassium ions to the upper computer for display.

Description

Technical Field

[0001] The present invention relates to the technical field of sweat monitoring, and particularly to a wearable sweat monitoring system. Background Art

[0002] During physical training, the amount of sweat excreted by the human body increases. Sweat contains sodium ions and potassium ions. When overtraining, excessive sweating will cause the loss of these elements in the body, resulting in a decline in physical fitness and even endangering physical health in severe cases.

[0003] For efficient training, it is necessary to monitor the sweat output of the trainer in real time. Monitoring the concentrations of sodium ions and potassium ions in sweat is an effective way to intuitively monitor the sweating situation during training. Existing wearable sweat detection systems usually use multiple sensors to collect data, which are relatively large in size and high in manufacturing cost. Based on this, the present invention designs a wearable sweat monitoring system that combines software and hardware. Summary of the Invention

[0004] The present invention aims at the problems and deficiencies existing in the prior art and provides a wearable sweat monitoring system.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] The present invention provides a wearable sweat monitoring system, which is characterized in that it includes a sweat collector and a wireless signal receiving host. The sweat collector includes a sweat sensing chip and a sweat collection host. The sweat sensing chip includes a flexible substrate, on which a Na ion detection electrode, a K ion detection electrode, a reference electrode, a first bent wire, a second bent wire, a third bent wire, a first welding wire electrode, a second welding wire electrode, and a third welding wire electrode are fixed. One end of the first bent wire is connected to the Na ion detection electrode, and the other end is connected to the first welding wire electrode. One end of the second bent wire is connected to the reference electrode, and the other end is connected to the second welding wire electrode. One end of the third bent wire is connected to the K ion detection electrode, and the other end is connected to the third welding wire electrode;

[0007] The sweat collection host includes a host shell. First and second bandage fixing holes are respectively opened on the left and right sides of the host shell. A first elastic bandage is fixed on the first bandage fixing hole, and a second elastic bandage is fixed on the second bandage fixing hole. The first elastic bandage and the second elastic bandage are fixed by a magic tape. A battery and a circuit board are arranged inside the host shell. A sweat signal acquisition circuit and a switch circuit are arranged on the circuit board. The sweat signal acquisition circuit is electrically connected to the first welding wire electrode, the second welding wire electrode, and the third welding wire electrode respectively;

[0008] The switch circuit is used to wake up the sweat signal acquisition circuit to work;

[0009] The sweat signal acquisition circuit is used to collect the sodium ion concentration and potassium ion concentration in the sweat on the wearer's skin surface through a sweat collection chip and transmit them to a wireless signal receiving host;

[0010] The wireless signal receiving host is used to transmit the received sodium ion concentration and potassium ion concentration to the upper computer for display.

[0011] The positive and progressive effects of the present invention are as follows:

[0012] The present invention designs a wearable sweat monitoring system, which is small in size and easy to carry. After the sweat collector is worn on the trainer's body, it can be in full contact with the human skin surface, can accurately collect the concentration of sodium ions and potassium ions in the sweat in real time, and is transmitted to the upper computer for display through the wireless signal receiving host, so that the trainer's sweating volume can be understood in real time, thereby providing a basis for scientific training. Brief Description of the Drawings

[0013] Figure 1 It is the control schematic diagram of the wearable sweat monitoring system of the preferred embodiment of the present invention.

[0014] Figure 2 It is the structural schematic diagram of the sweat sensing chip of the preferred embodiment of the present invention.

[0015] Figures 3-4 It is the three-dimensional view of the sweat collection host of the preferred embodiment of the present invention.

[0016] Figure 5 It is the bottom view of the sweat collection host of the preferred embodiment of the present invention.

[0017] Figure 6 It is the exploded view of the sweat collection host of the preferred embodiment of the present invention.

[0018] Figure 7 It is the circuit diagram on the circuit board of the preferred embodiment of the present invention.

[0019] Figure 8 It is the three-dimensional view of the wireless signal receiving host of the preferred embodiment of the present invention. Detailed Description of the Invention

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0021] For ease of description, only the parts related to the present invention are shown in the accompanying drawings. The first, second, etc. involved in the present invention are only for conveniently describing the technical solutions of the present invention and do not have specific limiting effects. They are all general references and do not constitute a limiting effect on the technical solutions of the present invention. It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The terms indicating positional relationships, such as "middle", "horizontal", "vertical", "longitudinal", "front", "rear", "left", "right", "inner", "outer", etc., are based on the positional relationships shown in the displayed accompanying drawings and do not represent that the components referred to must be presented in the positional relationships described. They do not constitute a limiting effect on the technical solutions of the present invention.

[0022] As Figures 1-8 shown, this embodiment provides a wearable sweat monitoring system, which includes a sweat collector 100 and a wireless signal receiving host 200. Among them, the sweat collector 100 includes a sweat sensing chip 10 and a sweat collection host 20.

[0023] Among them, see Figure 2 , the sweat sensing chip 10 includes a flexible substrate 11, on which a Na ion detection electrode 12, a reference electrode 13, a K ion detection electrode 14, a first bent wire 15, a second bent wire 16, a third bent wire 17, a first welding wire electrode 18, a second welding wire electrode 19, and a third welding wire electrode 110 are fixed. One end of the first bent wire 15 is connected to the Na ion detection electrode 12, and the other end is connected to the first welding wire electrode 18. One end of the second bent wire 16 is connected to the reference electrode 13, and the other end is connected to the second welding wire electrode 19. One end of the third bent wire 17 is connected to the K ion detection electrode 14, and the other end is connected to the third welding wire electrode 110.

[0024] In this embodiment, a flexible PCB is used as the flexible substrate 11, and the reference electrode 13 is a grounding electrode, providing a reference voltage of 0.

[0025] See Figures 3-6, the sweat collection main unit 20 includes a main unit housing 21 and a main unit base plate 22 that form the main unit outer shell. On the left and right sides of the main unit outer shell, a first bandage fixing hole 23 and a second bandage fixing hole 24 are respectively provided. A first elastic bandage is fixed on the first bandage fixing hole 23, and a second elastic bandage is fixed on the second bandage fixing hole 24. The first elastic bandage and the second elastic bandage are fixed by a magic tape; a magnetic connector 25 is embedded on the main unit housing 21; a battery 26 and a circuit board 27 are arranged inside the main unit outer shell. A sweat signal acquisition circuit and a switch circuit for waking up the sweat signal acquisition circuit to work are arranged on the circuit board 27, and the battery 26 supplies power to the sweat collection main unit 20.

[0026] The first welding wire electrode 18, the second welding wire electrode 19, and the third welding wire electrode 110 are connected to the magnetic connector (a commercially available product) and the magnetic connector 25. All three PIN pins of the magnetic connector 25 are electrically connected to the sweat signal acquisition circuit. The sweat signal acquisition circuit is used to collect the sodium ion concentration and potassium ion concentration in the sweat on the skin surface of the trainer. Connecting the sweat collection chip 10 and the sweat collection main unit 20 with a magnetic connector not only achieves complete sealing but also realizes detachable connection.

[0027] In this embodiment, the first elastic bandage and the second elastic bandage are fixed by a magic tape, which is a common structure, so it is not shown in detail in the figure. Refer to the strap of a smartwatch. Using elastic bandages for fixation, bandages of different lengths can be distributed according to different collection positions.

[0028] The assembly method of the main unit housing 21 and the main unit base plate 22 into the main unit outer shell is as follows: through holes 28 are provided at the four corner positions of the main unit base plate 22. Cylindrical convex seats 29 are fixed at the inner bottom of the main unit base plate 22 corresponding to the through holes 28. A perforation 291 is provided on each cylindrical convex seat 29. Each perforation 291 corresponds to a screw 210. A washer 211 is sleeved on each screw 210. The head of each screw 210 passes through the corresponding through hole 28, perforation 291, and the hole on the circuit board 27 and is screwed to the inner top of the main unit housing 21. The tail of each screw 210 is placed in the corresponding through hole 28. The washer 211 is used to seal the connection between the screw 210 and the bottom of the main unit base plate 22. Using a fully sealed outer shell, the internal circuit is not easily damaged by water ingress.

[0029] Among them, see Figure 7, the sweat signal acquisition circuit includes a single-chip microcomputer chip U1, and the model of the single-chip microcomputer chip U1 is nRF52832. The P0.28 pin (pin 14) of the single-chip microcomputer chip U1 is electrically connected to the PIN pin corresponding to the first welding wire electrode 18 to collect the Na ion electrical signal, and is also grounded through an electrostatic protection device D1 (model RCLAMP0521). The P0.29 pin (pin 13) of the single-chip microcomputer chip U1 is electrically connected to the PIN pin corresponding to the third welding wire electrode 110 to collect the K ion electrical signal, and is also grounded through an electrostatic protection device D2 (model RCLAMP0521). The GND pin (pin 15) of the single-chip microcomputer chip U1 is electrically connected to the PIN pin corresponding to the second welding wire electrode 19 to provide a ground signal. The VDD pin (pin 11) of the single-chip microcomputer chip U1 is connected to the voltage VCC of the battery, and the GND pin (pin 15) is grounded. Capacitors C1, C2 and an electrostatic protection device D3 (model RCLAMP0521) are respectively connected in parallel between the VDD pin (pin 11) and the GND pin (pin 15) of the single-chip microcomputer chip U1. A crystal oscillator circuit is connected between the P0.00 pin (pin 10) and the P0.01 pin (pin 9) of the single-chip microcomputer chip U1. The P0.15 pin (pin 5) of the single-chip microcomputer chip U1 sends the radio frequency signals of the Na ion and K ion concentrations. The P0.18 pin (pin 4) of the single-chip microcomputer chip U1 receives the signals sent by the wireless signal receiving host 200.

[0030] The sweat signal acquisition circuit further includes a storage circuit. The storage circuit includes a storage chip U2, and the model of the storage chip U2 is BL24C512A. The A0 pin (pin 1), A1 pin (pin 2), A2 pin (pin 3) and GND pin (pin 4) of the storage chip U2 are grounded. The VCC pin (pin 8) of the storage chip U2 is connected to the voltage VCC and is also grounded through a capacitor C5. The WP pin (pin 7) of the storage chip U2 is grounded, the SCL pin (pin 6) is electrically connected to the P0.05 pin (pin 8) of the single-chip microcomputer chip U1, and the SDA pin (pin 5) is electrically connected to the P0.06 pin (pin 7) of the single-chip microcomputer chip U1.

[0031] The switch circuit includes a magnetic switch Q1, and the model is HX6383SET. The pin 1 of the magnetic switch Q1 is connected to the voltage VCC, the pin 3 is grounded. The pin 2 of the magnetic switch Q1 is connected to the voltage VCC through a resistor R1 and is also electrically connected to the P0.08 pin (pin 6) of the single-chip microcomputer chip U1 to provide a switch pulse signal. The wearable sweat monitoring system further includes a strong magnet that cooperates with the magnetic switch Q1 to trigger the magnetic switch Q1 to generate a switch pulse signal.

[0032] See Figure 8, the wireless signal receiving host 200 includes a receiving host housing 201. Fixed support lugs 202 are fixed on opposite sides of the receiving host housing 201. An antenna hole 203 is formed in the receiving host housing 201, and an antenna is embedded in the receiving host housing 201 through the antenna hole 203. At least one communication interface 204 is also provided on the receiving host housing 201. A Bluetooth receiver, a data processor, and a communication module are provided inside the receiving host housing 201. The fixed support lugs 202 are used to fix the wireless signal receiving host 200 to other components.

[0033] During use, the sweat collection host 20 is strapped to the limb of the trainee through the first elastic bandage and the second elastic bandage. The surface of the sweat sensing chip 10 is coated with an adhesive, and the sweat sensing chip 10 is pasted on the skin of the trainee's limb through the adhesive. To ensure close and firm contact between the sweat sensing chip 10 and the skin of the trainee's limb, the sweat sensing chip 10 can be placed under the elastic bandage. After the first elastic bandage and the second elastic bandage are strapped together through Velcro, the sweat sensing chip 10 is clamped between the elastic bandage and the limb skin, so as to achieve close and firm contact between the sweat sensing chip 10 and the skin of the trainee's limb, making the collected sweat data more accurate.

[0034] The trainee holds a strong magnet in his hand. When the strong magnet approaches the sweat collection host 20, it will trigger the magnetic switch Q1 to generate a switch pulse signal for the single-chip microcomputer chip U1, waking up the sweat collection host 20 to work. The function of the switch circuit is to wake up the sweat signal collection circuit to work.

[0035] The sweat sensing chip 10 is attached to the skin surface to collect sweat, and the sodium and potassium ions in the sweat collected by the sweat sensor chip 10 are collected by the sweat collection host 20 in the form of an electrical signal. The single-chip microcomputer chip U1 in the sweat collection host 20 can collect two-way sweat ion signals (Na ion signal and K ion signal) in real time. After the collected electrical signals are internally amplified and AD converted, the obtained sodium ion concentration and potassium ion concentration are sent to the wireless signal receiving host in a wireless radio frequency manner. The wireless signal receiving host then transmits the received sodium ion concentration and potassium ion concentration to the upper computer 300, and the upper computer 300 can display the Na ion concentration and K ion concentration in the trainee's sweat in real time, and understand the trainee's sweating volume in real time.

[0036] Further, the transmitted information may carry the basic information of the trainer, such as identity information. The solution is as follows: The data processor is used to receive the basic information of the trainer transmitted from the host computer 300 through the communication module and transmit it to the sweat signal acquisition circuit in the sweat collection host 20 worn by the trainer; the sweat signal acquisition circuit is used to collect the sodium ion concentration and potassium ion concentration in the sweat on the skin surface of the trainer through the sweat collection chip 10 and transmit them to the data processor together with the basic information of the trainer through the Bluetooth receiver; the data processor is used to transmit the received sodium ion concentration, potassium ion concentration and the basic information of the trainer to the host computer 300 for display through the communication module.

[0037] The sweat sensing chip 10 is a voltage output type device. Immerse the sweat sensing chip 10 into the ionic liquid container. The experimental test results show that 10 mM of ions can generate a voltage of 0.315 V, and 20 mM of ions can generate a voltage of 0.318 V. According to the voltage range output by the above sweat sensing chip, the effective voltage detection range designed in this solution is 0.15 mV to 0.6 V. From the perspective of circuit detection accuracy, the circuit can detect when the ion concentration in the sweat is very low. The sweat Na ion concentration is between dozens and 160 mM, and the sweat K ion concentration generally does not exceed 32 mM.

[0038] The sweat collection host 20 is internally equipped with a long-life dry battery CR1632. Since the host is very power-saving, the battery replacement will not be frequent. The design of this host adopts the method of unscrewing the screw 210 to remove the host bottom plate 22.

[0039] Battery power consumption estimation:

[0040] Calculated according to the maximum transmission power, the emission current for one collection is 10 mA, and the period is 20 ms.

[0041] The current consumption for one time is 10X(0.02 / 3600) = 0.2 / 3600 mAH

[0042] Assume that data is collected every 3 s, then the power consumption in one hour is:

[0043] (0.2 / 3600)X20X60 = 0.066 mAH.

[0044] A CR1632 battery is nominally 140 mA. Calculated according to the available capacity of 90 mAH, it can work continuously for: 90 / 0.066 = 1363 hours, 1363 / 24 ≈ 56 days.

[0045] In short, it is estimated that the host can work continuously for up to 56 days.

[0046] Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that these are only examples, and the protection scope of the present invention is defined by the appended claims. Without departing from the principles and essence of the present invention, those skilled in the art can make various changes or modifications to these embodiments, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A wearable sweat monitoring system, characterized in that: It comprises a sweat collector and a wireless signal receiving host, the sweat collector comprises a sweat sensor chip and a sweat collection host, the sweat sensor chip comprises a flexible substrate, a Na ion detection electrode, a K ion detection electrode, a reference electrode, a first curved wire, a second curved wire, a third curved wire, a first welding wire electrode, a second welding wire electrode and a third welding wire electrode are fixed on the flexible substrate, one end of the first curved wire is connected to the Na ion detection electrode, and the other end is connected to the first welding wire electrode, one end of the second curved wire is connected to the reference electrode, and the other end is connected to the second welding wire electrode, one end of the third curved wire is connected to the K ion detection electrode, and the other end is connected to the third welding wire electrode; The sweat collection host comprises a host shell, a first bandage fixing hole and a second bandage fixing hole are respectively provided on the left and right sides of the host shell, a first elastic bandage is fixed on the first bandage fixing hole, a second elastic bandage is fixed on the second bandage fixing hole, the first elastic bandage and the second elastic bandage are fixed to each other by Velcro, a battery and a circuit board are arranged in the host shell, a sweat signal collection circuit and a switch circuit are arranged on the circuit board, and the sweat signal collection circuit is electrically connected to the first welding wire electrode, the second welding wire electrode and the third welding wire electrode respectively; The switch circuit is used to wake up the sweat signal collection circuit; the sweat signal collection circuit is used to collect the sodium ion concentration and potassium ion concentration in the sweat on the wearer's skin surface through the sweat collection chip and transmit them to the wireless signal receiving host; the wireless signal receiving host is used to transmit the received sodium ion concentration and potassium ion concentration to the host computer for display.

2. The wearable sweat monitoring system according to claim 1, wherein: The wireless signal receiving host comprises a receiving host shell, fixed ears are fixed on opposite sides of the receiving host shell, an antenna hole is provided on the receiving host shell, an antenna is embedded in the receiving host shell through the antenna hole, at least one communication interface is also provided on the receiving host shell, and a Bluetooth receiver, a data processor and a communication module are provided in the receiving host shell; The data processor is used to receive the basic information of the wearer from the upper computer through the communication module and transmit it to the sweat signal collection circuit in the sweat collection host worn by the wearer; The sweat signal collection circuit is used to collect the sodium ion concentration and potassium ion concentration in the sweat on the wearer's skin surface through the sweat collection chip and transmit them to the data processor through the Bluetooth receiver together with the basic information of the wearer; The data processor is used to transmit the received sodium ion concentration, potassium ion concentration and basic information of the wearer to the host computer for display through the communication module.

3. The wearable sweat monitoring system according to claim 1, wherein: A magnetic suction connector is embedded in the main body shell, and the first welding wire electrode, the second welding wire electrode and the third welding wire electrode are connected to the magnetic suction connector through a magnetic suction connector, and the three PIN needles of the magnetic suction connector are electrically connected to the sweat signal collection circuit.

4. The wearable sweat monitoring system according to claim 3, wherein: The sweat signal collection circuit includes a single-chip microcomputer chip U1, model nRF52832; The P0.28 pin of the single-chip microcomputer chip U1 is electrically connected to the PIN pin corresponding to the first welding wire electrode to collect the Na ion electrical signal and is also grounded through the electrostatic protection device D1. The P0.29 pin of the single-chip microcomputer chip U1 is electrically connected to the PIN pin corresponding to the third welding wire electrode to collect the K ion electrical signal and is also grounded through the electrostatic protection device D2. The GND pin of the single-chip microcomputer chip U1 is electrically connected to the PIN pin corresponding to the second welding wire electrode to provide a grounding signal. The VDD pin of the single-chip microcomputer chip U1 is connected to the battery voltage VCC, and the GND pin is grounded. The capacitor C1, the capacitor C2 and the electrostatic protection device D3 are respectively connected in parallel between the VDD pin and the GND pin of the single-chip microcomputer chip U1. The crystal oscillator circuit is connected between the P0.00 pin and the P0.01 pin of the single-chip microcomputer chip U1. The P0.15 pin of the single-chip microcomputer chip U1 sends the Na ion and K ion concentration radio frequency signals.

5. The wearable sweat monitoring system according to claim 4, wherein: The sweat signal collection circuit also includes a storage circuit, which includes a storage chip U2, model BL24C512A; The A0 pin, A1 pin, A2 pin and GND pin of the memory chip U2 are grounded, the VCC pin of the memory chip U2 is connected to the voltage VCC and is also grounded through the capacitor C5, the WP pin of the memory chip U2 is grounded, the SCL pin is electrically connected to the P0.05 pin of the microcontroller chip U1, and the SDA pin is electrically connected to the P0.06 pin of the microcontroller chip U1.

6. The wearable sweat monitoring system according to claim 4, wherein: The switch circuit includes a magnetic switch Q1, model HX6383SET; Pin 1 of the magnetic switch Q1 is connected to the voltage VCC, and pin 3 is grounded. Pin 2 of the magnetic switch Q1 is connected to the voltage VCC through the resistor R1, and is also electrically connected to the P0.08 pin of the microcontroller chip U1 to provide a switch pulse signal; The wearable sweat monitoring system also includes a strong magnet that cooperates with the magnetic switch Q1 to trigger the magnetic switch Q1 to generate a switch pulse signal.

7. The wearable sweat monitoring system according to claim 1, wherein: The host shell comprises a host casing and a host bottom plate, and the host bottom plate is fixed to the bottom of the host casing.

8. The wearable sweat monitoring system according to claim 7, wherein: Through holes are provided at the four corners of the mainframe bottom plate, and raised seats are fixed at the inner bottom of the mainframe bottom plate and at the positions corresponding to the through holes. A through hole is provided on each raised seat, and each through hole corresponds to a screw. The head of each screw passes through the corresponding through hole and is screwed to the inner top of the mainframe shell after the through hole, and the tail of each screw is placed in the corresponding through hole.

9. The wearable sweat monitoring system according to claim 8, wherein: A washer is sleeved on each screw to seal the bottom connection between the screw and the mainframe bottom plate.

10. The wearable sweat monitoring system according to claim 1, wherein: The flexible substrate uses a flexible PCB as the flexible substrate.

Images