Flexible temperature-sensitive sensor and body temperature monitoring system based on same

A temperature-sensitive sensor and monitoring system technology, which is applied in sensors, diagnostic recording/measurement, medical science, etc., can solve the problems of inconvenient operation and the inability of the body temperature monitoring system to continuously record body temperature changes, so as to achieve easy portability and remote medical monitoring. , the effect of improving the conversion efficiency

Active Publication Date: 2015-01-07

SUZHOU LEANSTAR ELECTRONICS TECH

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AI-Extracted Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is how to overcome the defects that the existing ...

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Method used

4, the calculation unit in the body temperature monitoring system of the present invention is by counting the difference between the measured person's current body temperature and the set value, and directly sends the difference to the converter, which greatly improves the conversion of the converter Efficiency, more convenient and faster, but also more clear.

4, the calculation unit in the body temperature monitoring system of the present invention is by counting the difference between the measured person's current body temperature and the set value, and directly sends the difference to the con...

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Abstract

The invention discloses a flexible temperature-sensitive sensor. The flexible temperature-sensitive sensor comprises a flexible substrate, a temperature-sensitive material layer, an electrode layer and a flexible protection layer, wherein the temperature-sensitive material layer is formed on the surface of the flexible substrate and provided with a three-dimensional porous nano-structure; the electrode layer comprises at least two electrodes, and the electrodes are led out from the temperature-sensitive material layer or the surface of the temperature-sensitive material layer; the flexible protection layer is formed on the surface of the temperature-sensitive material layer or the surface of the temperature-sensitive material layer and the portion of the electrode layer, on the surface of the temperature-sensitive material layer. The invention further discloses a body temperature monitoring system based on the flexible temperature-sensitive sensor. The sensor disclosed by the invention is light, thin and soft, capable of being machined into various shapes, and capable of being attached and worn on the surface of the skin as clothes; the sensor and the monitoring system have the advantages of being high in sensitivity, simple to operate, non-invasive, accurate in measurement result, and capable of continuously recording body temperature changes.

Application Domain

Diagnostic recording/measuringSensors

Technology Topic

Non invasiveBiomedical engineering +9

Image

Examples

Experimental program(4)

Example Embodiment

[0041] Example 1: Please refer to figure 1 , The present invention provides a flexible temperature-sensitive sensor, comprising: a flexible substrate 4, a temperature-sensitive material layer 3, an electrode layer 2 and a flexible protective layer 1. The temperature-sensitive material layer 3 is formed on the surface of the flexible substrate 4 and has A three-dimensional porous nanostructure, the electrode layer 2 includes two electrodes which are drawn from the surface of the temperature-sensitive material layer 3, the flexible protective layer 1 is formed on the surface of the temperature-sensitive material layer 3 and the electrode layer 2 is located on the temperature-sensitive material Layer 3 surface part.

[0042] Wherein, the temperature-sensitive material layer is prepared by the following steps:

[0043] S1, after mixing 2 g of reduced graphene oxide and 2 g of ethanol, perform ultrasonic treatment for 30 minutes to obtain a slurry mixture;

[0044] S2, add 1g to the slurry mixture, the density is 1.043g/cm 3 Polydimethylsiloxane (PDMS), a viscous mixture is obtained after stirring for 0.5h;

[0045] S3. Coating the viscous mixture on a flexible substrate, and then heating and curing at 60° C. for 3 hours to prepare the temperature-sensitive material layer, and the size of the pores of the temperature-sensitive material layer is 0.5-2.5 μm , And the gap between the holes is 10-30μm.

[0046] Wherein, the polydimethylsiloxane is a flexible high molecular polymer. During the formation of the three-dimensional porous nanostructure, with the volatilization of ethanol, exhaust pores are formed in the polydimethylsiloxane and the gas phase is introduced to realize the existence of gas-solid two phases in the material, and then form a similar ant nest. A temperature-sensitive material with three-dimensional porous nanostructures.

[0047] The carbon material can also be one or a combination of graphene and carbon nanotubes; the volatile solvent can also be one of dichloromethane, ethyl acetate, acetone, and carbon tetrachloride Or a combination of multiple.

[0048] The material of the electrode layer is a conductive non-woven fabric, and the thickness of the conductive non-woven fabric is 40 μm.

[0049] The material of the electrode layer may also be copper foil, and the thickness of the copper foil is 10 μm.

[0050] Both the flexible substrate 4 and the flexible protective layer 1 have good biocompatibility, and good biocompatibility means that when the material contacts the skin, there is no toxicity, no allergies, or inflammatory reactions.

[0051] The flexible substrate is polydimethylsiloxane with a thickness of 60 μm.

[0052] The thickness of the flexible substrate is 60 μm, and the flexible substrate may also be one of ethylene-vinyl acetate copolymer, polyethylene terephthalate, polyimide, and polyethylene;

[0053] The flexible protective layer is a polydimethylsiloxane film with a thickness of 10 μm.

[0054] The flexible protective layer can also be an ethylene-vinyl acetate copolymer or a polyethylene film with a thickness of 10 μm.

[0055] Wherein, the method for preparing the flexible temperature-sensitive sensor includes the following steps:

[0056] S1, cleaning and drying the flexible substrate, the flexible substrate being a PDMS film with a thickness of 60 μm;

[0057] S2. Mix 2 g of reduced graphene oxide and 2 g of ethanol, and ultrasonicate for 30 minutes to obtain a slurry mixture. Add 1 g of PDMS to the slurry mixture, and stir for 0.5 hours to obtain a viscous mixture;

[0058] S3. The viscous mixture prepared in step S2 is coated on the surface of the flexible substrate PDMS, and then heated and cured at 60° C. for 3 hours to form a temperature-sensitive material layer with a three-dimensional porous nanostructure. The size of the holes of the material layer is uneven, and is 0.5-2.5 μm, and the gap between the holes is not equal, which is 10-30 μm;

[0059] S4. Leading out two electrodes on the surface of the temperature-sensitive material layer in step S3;

[0060] S5. Coat the surface of the electrode layer and the temperature-sensitive material layer with a 10μm PDMS film to form a protective layer, and then heat and cure at 60°C for 3h to melt the protective layer, electrode layer, temperature-sensitive material layer and flexible substrate One.

[0061] Wherein, when the carbon material, volatile solvent, flexible substrate and flexible protective layer are other materials, they can be replaced in corresponding steps.

[0062] Correspondingly, the present invention also provides a body temperature monitoring system based on the above-mentioned flexible temperature-sensitive sensor, including: a flexible temperature-sensitive sensor, a signal processing module, and a display module, and the signal processing module is respectively connected to the flexible temperature-sensitive sensor and the display module. Connected,

[0063] The flexible temperature-sensitive sensor is used to collect the body temperature signal of the subject and transmit the collected body temperature signal to the signal processing module;

[0064] The signal processing module is used to process the collected body temperature signal and transmit the processed signal to the display module. The signal processing module in turn includes an amplifier, a filter, a calculation unit, and a converter, respectively The body temperature signal collected by the flexible temperature sensor is amplified, filtered, calculated and converted;

[0065] The display module is used to display the body temperature digital signal and the temperature difference signal processed by the signal processing module.

[0066] Among them, the amplifier is used to amplify the collected body temperature data signal by a certain multiple; the filter is used to filter out the background noise signal in the signal collected by the flexible temperature sensor to obtain effective body temperature data; the calculation unit, Used to calculate the difference between the current body temperature of the subject and the set value, and automatically count the difference; the converter is used to convert the collected body temperature signal and the difference into a digital signal.

[0067] The flexible temperature-sensitive sensor, the signal processing circuit module and the display module perform signal transmission through a wired connection.

[0068] The flexible temperature-sensitive sensor collects the body temperature signal of the subject and transmits it to the signal processing module. The signal processing module directly processes the collected body temperature signal, and then the signal processing module transmits the processed signal to the display unit. The processed temperature difference signal is displayed in the form of a temperature curve.

[0069] The flexible temperature sensitive sensor of the present invention and the body temperature monitoring system based on the flexible temperature sensitive sensor have the following beneficial effects:

[0070] 1. The material of the flexible temperature-sensitive sensor of the present invention has the advantages of non-toxicity, good biocompatibility, flexibility, and thinness. Therefore, the flexible temperature-sensitive sensor is light, small, flexible, convenient to carry, and can detect body temperature changes in real time and without trauma.

[0071] 2. The three-dimensional porous nanostructure of the present invention realizes the existence of gas-solid two phases in the material, so the flexible temperature sensor has a higher sensitivity to temperature.

[0072] 3. The body temperature monitoring system based on the flexible temperature sensor has the advantages of being compact, intelligent, easy to carry, and low cost.

[0073] 4. The calculation unit in the body temperature monitoring system of the present invention counts the difference between the examinee’s current body temperature and the set value, and directly transmits the difference to the converter, which greatly improves the conversion efficiency of the converter, and more Convenient and fast, but also more clear.

Example Embodiment

[0074] Embodiment two:

[0075] See figure 1 The present invention provides a flexible temperature-sensitive sensor for body temperature monitoring, comprising: a flexible substrate 4, a temperature-sensitive material layer 3, an electrode layer 2 and a flexible protective layer 1, the temperature-sensitive material layer 3 is formed on the flexible liner The bottom 4 has a three-dimensional porous nanostructure on the surface. The electrode layer 2 includes four electrodes, the electrodes are drawn from the temperature-sensitive material layer 3, and the flexible protective layer 1 is formed on the surface of the temperature-sensitive material layer 3.

[0076] Wherein, the temperature-sensitive material layer is prepared by the following steps:

[0077] S1, after mixing 2 g of reduced graphene oxide and 3 g of ethanol, perform ultrasonic treatment for 40 minutes to obtain a slurry mixture;

[0078] S2, add 2g to the slurry mixture, the density is 1.043g/cm 3 PDMS, stirred for 1h to obtain a viscous mixture;

[0079] S3. Coat the viscous mixture on a flexible substrate, and then heat and cure it at 70°C for 2 hours to prepare the temperature-sensitive material layer, and the size of the pores of the temperature-sensitive material layer is 2-4.5 μm , And the gap between the holes is 40-60μm.

[0080] Among them, in the process of forming the three-dimensional porous nanostructure, with the volatilization of ethanol, vent channels are formed in the polydimethylsiloxane and the gas phase is introduced to realize the existence of gas-solid two phases in the material, and then form similar A temperature-sensitive material with an ant nest-like three-dimensional porous nanostructure.

[0081] The carbon material can also be one or a combination of graphene and carbon nanotubes; the volatile solvent can also be one of dichloromethane, ethyl acetate, acetone, and carbon tetrachloride Or a combination of multiple.

[0082] The material of the electrode layer is a conductive non-woven fabric, and the thickness of the conductive non-woven fabric is 55 μm.

[0083] The material of the electrode layer may also be copper foil, and the thickness of the copper foil is 13 μm.

[0084] Both the flexible substrate 4 and the flexible protective layer 1 have good biocompatibility, and good biocompatibility means that when the material contacts the skin, there is no toxicity, no allergies, or inflammatory reactions.

[0085] The flexible substrate is polydimethylsiloxane with a thickness of 75 μm.

[0086] The thickness of the flexible substrate is 75 μm, and the flexible substrate may also be one of ethylene-vinyl acetate copolymer, polyethylene terephthalate, polyimide, and polyethylene;

[0087] The flexible protective layer is a polydimethylsiloxane film with a thickness of 15 μm.

[0088] The flexible protective layer can also be an ethylene-vinyl acetate copolymer film or a polyethylene film with a thickness of 15 μm.

[0089] Wherein, the method for preparing the flexible temperature-sensitive sensor includes the following steps:

[0090] S1, cleaning and drying the flexible substrate, the flexible substrate being a PDMS film with a thickness of 75 μm;

[0091] S2. Mix 2g of reduced graphene oxide and 3g of ethanol and ultrasonicate for 40min to obtain a slurry mixture. Add 2g of PDMS to the slurry mixture and stir for 1 hour to obtain a viscous mixture;

[0092] S3. The viscous mixture prepared in step S2 is coated on the surface of the flexible substrate PDMS, and then heated and cured at 70° C. for 2 hours to form a temperature-sensitive material layer with a three-dimensional porous nanostructure. The size of the holes in the material layer is uneven, and is 2 to 4.5 μm, and the gap between the holes is not equal, and is 40 to 60 μm;

[0093] S4. Divide the temperature-sensitive material layer in step S3 into arrayed devices including two sensing units, and draw four electrodes from the temperature-sensitive material layer;

[0094] S5. Coating a PDMS film with a thickness of 15 μm on the surface of the temperature-sensitive material layer to form a protective layer, and then heat and cure at 70° C. for 2 hours to integrate the protective layer, electrode layer, temperature-sensitive material layer and flexible substrate.

[0095] Wherein, when the flexible substrate and the flexible protective layer are made of other materials, they can be replaced in corresponding steps.

[0096] Correspondingly, the present invention also provides a body temperature monitoring system based on the above-mentioned flexible temperature-sensitive sensor, including: a flexible temperature-sensitive sensor, a signal processing module, and a display module, and the signal processing module is respectively connected to the flexible temperature-sensitive sensor and the display module. Connected,

[0097] The flexible temperature-sensitive sensor is used to collect the body temperature signal of the subject and transmit the collected body temperature signal to the signal processing module;

[0098] The signal processing module is used to process the collected body temperature signal and transmit the processed signal to the display module. The signal processing module in turn includes an amplifier, a filter, a calculation unit, and a converter, respectively The body temperature signal collected by the flexible temperature sensor is amplified, filtered, calculated and converted;

[0099] The display module is used to display the body temperature digital signal and the temperature difference signal processed by the signal processing module.

[0100] Among them, the amplifier is used to amplify the collected body temperature data signal by a certain multiple; the filter is used to filter out the background noise signal in the signal collected by the flexible temperature sensor to obtain effective body temperature data; the calculation unit, Used to calculate the difference between the current body temperature of the subject and the set value, and automatically count the difference; the converter is used to convert the collected body temperature signal and the difference into a digital signal.

[0101] The flexible temperature sensitive sensor, the signal processing circuit module and the display module carry out signal transmission through Bluetooth.

[0102] Among them, signal transmission can also use GPRS (General Packet Radio Service), GSM (Global System of Mobile communication), WLAN (Wireless Local Area Networks, wireless local area network), CDMA (Code Division Multiple Access), TDMA (Time Division Multiple Access), NFC (Near Field Communication), Wi-Fi (Wireless-Fidelity, wireless fidelity), infrared wireless technology, TV communication network or other Remote communication network.

[0103] The flexible temperature-sensitive sensor collects the body temperature signal of the subject and transmits it to the signal processing module. The signal processing module processes the collected body temperature signal. The signal processing module then transmits the processed signal to the display unit, and the display unit will process the signal The temperature difference signal is displayed in the form of a temperature curve.

[0104] The flexible temperature sensitive sensor of the present invention and the body temperature monitoring system based on the flexible temperature sensitive sensor have the following beneficial effects:

[0105] 1. The material of the flexible temperature-sensitive sensor of the present invention has the advantages of non-toxicity, good biocompatibility, flexibility, and thinness. Therefore, the flexible temperature-sensitive sensor is light, small, flexible, convenient to carry, and can detect body temperature changes in real time and without trauma.

[0106] 2. The three-dimensional porous nanostructure of the present invention realizes the existence of gas-solid two phases in the material, so the flexible temperature sensor has a higher sensitivity to temperature.

[0107] 3. The body temperature monitoring system based on the flexible temperature sensor has the advantages of being compact, intelligent, easy to carry, and low cost.

[0108] 4. The calculation unit in the body temperature monitoring system of the present invention counts the difference between the examinee's current body temperature and the set value, and directly transmits the difference to the converter, which greatly improves the conversion efficiency of the converter.

[0109] 5. The transmitter module of the present invention transmits body temperature signals in the form of wireless transmission, which can realize remote medical monitoring.

Example Embodiment

[0110] Embodiment three:

[0111] See figure 1 , The present invention provides a flexible temperature-sensitive sensor, comprising: a flexible substrate 4, a temperature-sensitive material layer 3, an electrode layer 2 and a flexible protective layer 1. The temperature-sensitive material layer 3 is formed on the surface of the flexible substrate 4 and has A three-dimensional porous nanostructure, the electrode layer 2 includes two electrodes which are drawn from the surface of the temperature-sensitive material layer 3, the flexible protective layer 1 is formed on the surface of the temperature-sensitive material layer 3 and the electrode layer 2 is located on the temperature-sensitive material Layer 3 surface part.

[0112] Wherein, the temperature-sensitive material layer is prepared by the following steps:

[0113] S1. After mixing 5 g of graphene and 15 g of dichloromethane, ultrasonic treatment is performed for 50 minutes to obtain a slurry mixture;

[0114] S2, add 1g to the slurry mixture, the density is 1.043g/cm 3 PDMS, stirred for 1.5h to obtain a viscous mixture;

[0115] S3. Coating the viscous mixture on the flexible substrate, and then heating and curing at 75° C. for 1.5 hours to prepare the temperature-sensitive material layer, and the size of the pores of the temperature-sensitive material layer is 5-8 μm , And the gap between the holes is 65-80μm.

[0116] Among them, in the process of forming the three-dimensional porous nanostructure, with the volatilization of methylene chloride, exhaust pores are formed in the polydimethylsiloxane and the gas phase is introduced to realize the existence of gas-solid two phases in the material, and then A temperature-sensitive material with a three-dimensional porous nanostructure similar to an ant nest is formed.

[0117] The carbon material can also be one or a combination of reduced graphene oxide, graphene oxide, and carbon nanotubes; the volatile solvent can also be ethanol, ethyl acetate, acetone, and carbon tetrachloride One or more of them.

[0118] The material of the electrode layer is a conductive non-woven fabric, and the thickness of the conductive non-woven fabric is 65 μm.

[0119] The material of the electrode layer may also be copper foil, and the thickness of the copper foil is 15 μm.

[0120] Both the flexible substrate 4 and the flexible protective layer 1 have good biocompatibility, and good biocompatibility means that when the material contacts the skin, there is no toxicity, no allergies, or inflammatory reactions.

[0121] The flexible substrate is polydimethylsiloxane with a thickness of 85 μm.

[0122] The thickness of the flexible substrate is 85 μm, and the flexible substrate may also be one of ethylene-vinyl acetate copolymer, polyethylene terephthalate, polyimide, and polyethylene;

[0123] The flexible protective layer is a polydimethylsiloxane film with a thickness of 20 μm.

[0124] The flexible protective layer can also be an ethylene-vinyl acetate copolymer film or a polyethylene film with a thickness of 20 μm.

[0125] Wherein, the method for preparing the flexible temperature-sensitive sensor includes the following steps:

[0126] S1, cleaning and drying a flexible substrate, the flexible substrate being a PDMS film with a thickness of 85 μm;

[0127] S2. Mix 5 g of graphene and 15 g of dichloromethane and ultrasonicate for 50 minutes to obtain a slurry mixture. Add 1 g of PDMS to the slurry mixture, and stir for 1.5 hours to obtain a viscous mixture;

[0128] S3. The viscous mixture prepared in step S2 is coated on the surface of the flexible substrate PDMS, and then heated and cured at 75° C. for 1.5 hours to form a temperature-sensitive material layer with a three-dimensional porous nanostructure. The size of the holes of the sensitive material layer is uneven, and is 5-8μm, and the gap between the holes is not equal, 65-80μm;

[0129] S4. Leading out two electrodes on the surface of the temperature-sensitive material layer in step S3;

[0130] S5. Coat a PDMS film with a thickness of 20μm on the surface of the temperature-sensitive material layer and the part of the electrode layer on the surface of the temperature-sensitive material layer to form a protective layer, and then heat and cure at 75°C for 1.5h to make the protective layer, electrode layer and temperature sensitive The sensitive material layer and the flexible substrate are integrated.

[0131] Wherein, when the flexible substrate and flexible protective layer are made of other materials, the corresponding flexible substrate and flexible protective layer can be replaced in corresponding steps.

[0132] Correspondingly, the present invention also provides a body temperature monitoring system based on the above-mentioned flexible temperature-sensitive sensor, including: a flexible temperature-sensitive sensor, a signal processing module, an alarm module, and a display module, the signal processing module and the flexible temperature-sensitive sensor respectively Is connected to the alarm module, and the signal processing module is respectively connected to the flexible temperature sensor and the display module,

[0133] The flexible temperature-sensitive sensor is used to collect the body temperature signal of the subject and transmit the collected body temperature signal to the signal processing module;

[0134] The signal processing module is used to process the collected body temperature signal and transmit the processed signal to the display module. The signal processing module in turn includes an amplifier, a filter, a calculation unit, and a converter, respectively The body temperature signal collected by the flexible temperature sensor is amplified, filtered, calculated and converted;

[0135] The alarm module is used to send an alarm signal when the difference exceeds a preset value;

[0136] The display module is used to display the body temperature digital signal and the temperature difference signal processed by the signal processing module.

[0137] Among them, the amplifier is used to amplify the collected body temperature data signal by a certain multiple; the filter is used to filter out the background noise signal in the signal collected by the flexible temperature sensor to obtain effective body temperature data; the calculation unit, Used to calculate the difference between the current body temperature of the subject and the set value, and automatically count the difference; the converter is used to convert the collected body temperature signal and the difference into a digital signal.

[0138] Signal transmission is carried out between the signal processing circuit module and the display module through GPRS.

[0139] Among them, the signal transmission can also use Bluetooth, GSM (Global System of Mobile communication, global mobile communication system), WLAN (Wireless Local Area Networks, wireless local area network), CDMA (Code Division Multiple Access), TDMA (Time Division Multiple Access, Time Division Multiple Access), NFC (Near Field Communication, Near Field Communication), Wi-Fi (Wireless-Fidelity, wireless fidelity), infrared wireless technology, TV communication network or other remote communication network.

[0140] The flexible temperature-sensitive sensor collects the body temperature signal of the subject and transmits it to the signal processing module. The signal processing module processes the collected body temperature signal, and then the signal processing module transmits the processed signal to the alarm module and the display unit. The alarm module When the temperature difference exceeds the preset value, an alarm signal is issued, and the display unit displays the processed temperature difference signal in the form of a temperature curve.

[0141] The flexible temperature sensor and body temperature monitoring system of the present invention have the following beneficial effects:

[0142] 1. The material of the flexible temperature-sensitive sensor of the present invention has the advantages of non-toxicity, good biocompatibility, flexibility, and thinness. Therefore, the flexible temperature-sensitive sensor is light, small, flexible, convenient to carry, and can detect body temperature changes in real time and without trauma.

[0143] 2. The three-dimensional porous nanostructure of the present invention realizes the existence of gas-solid two phases in the material, so the flexible temperature sensor has a higher sensitivity to temperature.

[0144] 3. The body temperature monitoring system based on the flexible temperature sensor has the advantages of being compact, intelligent, easy to carry, and low cost.

[0145] 4. The calculation unit in the body temperature monitoring system of the present invention counts the difference between the examinee's current body temperature and the set value, and directly transmits the difference to the converter, which greatly improves the conversion efficiency of the converter.

[0146] 5. The transmitter module of the present invention transmits body temperature signals in the form of wireless transmission, which can realize remote medical monitoring.

[0147] 6. The alarm module of the present invention can be used in real-time monitoring. When it is found that the temperature difference exceeds the preset value, it will alarm in time and notify the relevant operators to effectively prevent the testee from being abnormal without operator monitoring. His body temperature was not found.

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PUM

Property	Measurement	Unit
Thickness	40.0 ~ 80.0	µm
Thickness	10.0 ~ 20.0	µm
Thickness	60.0 ~ 100.0	µm
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Good biocompatibility
Easy to carry

Flexible temperature-sensitive sensor and body temperature monitoring system based on same

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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