CN114847924A - Self-powered respiration monitoring sensor, preparation method thereof and respiration monitoring system - Google Patents

Self-powered respiration monitoring sensor, preparation method thereof and respiration monitoring system Download PDF

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Publication number
CN114847924A
CN114847924A CN202210367244.8A CN202210367244A CN114847924A CN 114847924 A CN114847924 A CN 114847924A CN 202210367244 A CN202210367244 A CN 202210367244A CN 114847924 A CN114847924 A CN 114847924A
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layer
electrode layer
respiration monitoring
module
self
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刘超然
李颖哲
汪永
董林玺
王高峰
韩晶晶
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Hangzhou Dianzi University
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Hangzhou Dianzi University
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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
    • A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
    • A61B5/087—Measuring breath flow
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G06F30/28—Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/016—Personal emergency signalling and security systems
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/12—Manually actuated calamity alarm transmitting arrangements emergency non-personal manually actuated alarm, activators, e.g. details of alarm push buttons mounted on an infrastructure
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/18—Prevention or correction of operating errors
    • G08B29/20—Calibration, including self-calibrating arrangements
    • G08B29/24—Self-calibration, e.g. compensating for environmental drift or ageing of components
    • G08B29/26—Self-calibration, e.g. compensating for environmental drift or ageing of components by updating and storing reference thresholds
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N1/00—Electrostatic generators or motors using a solid moving electrostatic charge carrier
    • H02N1/04—Friction generators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2113/00—Details relating to the application field
    • G06F2113/08—Fluids

Abstract

The invention belongs to the technical field of intelligent monitoring of sensors, and particularly relates to a self-powered respiration monitoring sensor, a preparation method thereof and a respiration monitoring system. A self-powered respiration monitoring sensor comprising a core flutter module and an external frame module; the core flutter module comprises a lower friction layer, a lower electrode layer, an upper friction electrode layer and a substrate layer, wherein the lower friction layer, the lower electrode layer, the upper friction electrode layer and the substrate layer are different in friction sequence; the outer frame module comprises a side rail with round holes at two sides, a hollow copper support and a substrate layer. The respiration monitoring system comprises a self-powered respiration monitoring sensor, an impedance matching module, a level adjusting module, a main control module, a wireless transmission module, an interaction module based on a QT upper computer, an APP human-computer interaction module and an analysis module. The invention has the characteristics of high portability, multi-parameter measurement, adaptive wireless transmission network and wearing comfort.

Description

Self-powered respiration monitoring sensor, preparation method thereof and respiration monitoring system
Technical Field
The invention belongs to the technical field of intelligent monitoring of sensors, and particularly relates to a self-powered respiration monitoring sensor, a preparation method thereof and a respiration monitoring system.
Background
Wireless wearable electronic devices capable of monitoring physiological parameters have been widely studied in recent years as a key element of future electronics. Health monitoring provides a person's health status, such as heart rate, body temperature, respiratory rate and lactate concentration, and real-time monitoring of health status helps prevent, diagnose and treat cardiovascular diseases, stroke and diabetes. Breathing, which is an important health marker for an adult who breathes more than twenty thousand times a day, contains a variety of information about the underlying disease. Respiratory diseases and sub-health diseases are very common in the world due to problems of air pollution, social aging, poor health behaviors, and the like. The respiratory parameter is one of the most important and reliable indexes directly reflecting the human physiological health, and can provide key information for predicting and diagnosing potential respiratory system diseases such as respiratory dysfunction caused by Obstructive Sleep Apnea Syndrome (OSAS) and cystic fibrosis.
With the outbreak of the novel coronavirus (COVID-19), patients recovering from this condition have become a new focus of attention for researchers. Since the late adverse effects of COVID-19 are apparent and still accompany various chronic diseases after healing. The potential for wearable medical devices is becoming more and more apparent as urgent concerns are also needed for the problem of performing subsequent health monitoring and healthcare on tens of millions of patients. Hospital or laboratory tests are typical measures of respiratory diseases, but require strict control of the real-time environment, are costly, and are not suitable for long-term daily home monitoring.
Most respiration monitoring sensor systems currently available are bulky and even the only measurement method to detect respiration in certain areas remains clinical monitoring in hospitals, which is contrary to the need for conventional respiration monitoring equipment in everyday life. While minimizing the size of the health sensor and reducing power consumption have been successful, extending the continuous runtime of the health sensor remains a significant challenge. Furthermore, health monitoring sensors are often integrated into textiles, clothing or applied directly to the skin.
Therefore, it is necessary to design a self-powered respiration monitoring sensor, a manufacturing method thereof and a respiration monitoring system, wherein the self-powered respiration monitoring sensor is portable, flexible, light in weight, comfortable and biocompatible.
For example, chinese patent application No. CN201910080965.9 describes a three-dimensional foldable respiration self-driven flexible respiration monitoring sensor and a method for manufacturing the same, a first friction unit and a second friction unit are disposed on a bottom wall of a box structure, the first friction unit and the second friction unit each include a substrate layer, a conductive electrode layer, and a friction layer, which are sequentially stacked, the second friction unit is fixed on the bottom wall of the box structure, and the friction layer of the first friction unit is directly opposite to the friction layer of the second friction unit; the stratum basale department of first friction unit is equipped with the atress baffle, is connected with the balloon between box body structure and the atress baffle, and the intake pipe intercommunication that the balloon set up structurally with the box body, the lateral wall of box body structure are equipped with the outlet duct, and the conducting electrode layer of first friction unit and the conducting electrode layer of second friction unit are connected with outside electrometer electricity through the wire respectively. Although the self-powered monitoring of the respiratory behavior of the human body is realized by utilizing the micro energy of the respiratory airflow of the human body, the respiratory monitoring sensor has the defects of few monitoring parameters, low accuracy, high cost and single function.
Disclosure of Invention
The invention provides a self-powered respiration monitoring sensor with the characteristics of high portability, multi-parameter measurement, adaptive wireless transmission network and wearing comfort, a preparation method thereof and a respiration monitoring system, aiming at overcoming the problems that the traditional respiration sensor has few monitoring parameters, low accuracy, high cost, single function and incapability of self-powering in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a self-powered respiration monitoring sensor comprising a core flutter module and an external frame module; the core flutter module is fixed on the external frame module; the core flutter module comprises a lower friction layer, a lower electrode layer, an upper friction electrode layer and a substrate layer; the upper friction electrode layer is adhered below the substrate layer; the lower electrode layer is adhered below the lower friction layer; the upper friction electrode layer is positioned above the lower friction layer.
Preferably, the upper friction electrode layer and the substrate layer form an upper layer film through magnetron metal sputtering; the lower friction layer is a polytetrafluoroethylene film which is subjected to an ICP etching process; the lower electrode layer is a copper film with adhesiveness.
Preferably, the external frame module comprises a side rail with round holes at two sides, a hollow copper support arranged on the side rail and a substrate layer; the side columns are arranged on two sides of the substrate layer; the bottom layer of the lower electrode layer is adhered to the upper side of the substrate layer.
Preferably, a gap with the same width as the upper friction electrode layer is arranged in the middle of the hollow copper support; one part of the upper friction electrode layer is fixed in the hollow copper support in a curling shape, and the other part of the upper friction electrode layer extends out of the gap of the hollow copper support and is in contact with the lower friction layer; and two ends of the hollow copper support are respectively positioned in the round holes of the two side rails.
Preferably, an included angle alpha of 45 degrees is formed between the upper friction electrode layer and the vertical direction in an initial state; an included angle beta of 30 degrees is formed between the respiratory airflow direction and the bottom surface direction of the self-powered respiration monitoring sensor.
Preferably, the side rail is a PMMA film, and the PMMA film is streamline; the side rail is tightly adhered to the substrate layer.
The invention also provides a preparation method of the self-powered respiration monitoring sensor, which comprises the following steps:
s1, cutting a piece of copper film from the copper foil tape, and then bonding the copper film and the polytetrafluoroethylene film together to form an upper friction electrode layer;
s2, depositing a layer of aluminum on the substrate layer in a magnetron metal sputtering mode to form a lower electrode layer, and simultaneously processing the polytetrafluoroethylene film of the lower friction layer by adopting an ICP (inductively coupled plasma) etching process;
s3, cutting the PMMA film into streamline shapes by laser cutting, and taking the streamline shapes as side fences to be tightly adhered to two sides of the substrate layer;
s4, adopting a PDMS film as a substrate layer, attaching a lower electrode layer on the substrate layer through a pressure-sensitive adhesive, and fixing and leading out a lead between the substrate layer and the lower electrode layer;
and S5, partially curling the upper friction electrode layer, embedding the upper friction electrode layer into the hollow copper bracket, extending the other part out of the hollow copper bracket to be in contact with the lower friction layer, and connecting and leading out a lead wire with the hollow copper bracket.
The invention also provides a respiration monitoring system, which comprises a self-powered respiration monitoring sensor;
the hardware processing module is used for controlling signal transmission;
the interaction module based on the QT upper computer is used for realizing real-time display and parameter extraction of the respiratory signals;
the APP human-computer interaction module is used for extracting the frequency, the depth, the AHI index and the expiratory peak flow rate value FEP of the respiratory signal and sending the frequency, the depth, the AHI index and the expiratory peak flow rate value FEP to the cloud platform to be shared to the medical institution in real time;
and the analysis module is used for obtaining the information of the breathing depth and the airflow velocity by analyzing the real-time frequency and the amplitude of the generated voltage output.
Preferably, the respiration monitoring system further comprises a lead led out from the upper friction electrode layer, a lead led out from the lower electrode layer and a cloud platform data processing terminal for sharing and storing data.
Compared with the prior art, the invention has the beneficial effects that: (1) the invention designs the flexible and movable hollow copper support structure, on one hand, when the device is driven to work along with the respiratory airflow, the output response of the device can be effectively increased through the flutter effect of the structure along with the respiratory airflow; on the other hand, the respiration sensing device needs to be attached to a human body, and a lead is led out to output signals, and the lead is directly connected to the upper electrode, so that the stability of the device and the output performance of the device are not facilitated, and the lead is output through the side face of the conductive hollow copper support, so that the interference generated by the lead can be effectively avoided; meanwhile, the streamline-shaped side rail is designed in the device, so that the influence of airflows in different directions in the external environment on output signals is effectively prevented, the streamline-shaped structure also conforms to the principle of human engineering, and the possible damage of a sharp device to a wearer is avoided; (2) according to the invention, one part of the curled upper layer film is stored in the hollow copper support, and when the performance of the other part of the exposed film is reduced, the upper friction electrode layer stored in the support can be extracted for timely replacement, so that the stability of the device is ensured; the invention designs a wireless transmission and processing circuit adaptive to a respiration monitoring sensor, a software QT upper computer and a mobile phone end APP module, can extract real-time respiration physiological parameters, can provide related recovery suggestions and potential disease warnings for a tester through data analysis, has a one-key alarm function, can enable the tester to be in timely contact with a medical institution in an emergency, and can remotely monitor the respiration information of two nostrils in real time and transmit the respiration information to a cloud end to be shared to the medical institution; (4) the invention designs a calibration algorithm of related respiratory airflow data and output signals related to environment humidity and temperature, obtains different calibration compensation parameters corresponding to the device under different environments and different airflow flow rates by recording different output responses of the device under different temperatures and humidity tested by the device and recording the output responses by Matlab software and performing surface fitting, so that the output response is more accurate, and also designs a mechanical calibration function, so that the alarm threshold value of the device can be improved under the condition that a tester performs strong mechanical motions such as motion, and the false alarm condition is avoided.
Drawings
FIG. 1 is a schematic diagram of a self-powered respiration monitoring sensor according to the present invention;
FIG. 2 is a graph showing a comparison of output voltages of the hollow copper support and the fixed electrode structure and a schematic structure of the memory film according to the present invention;
FIG. 3 is a graph of a test output of a self-powered respiration monitoring sensor of the present invention under various respiration conditions; FIG. b is a respiratory parameter analysis curve; the figure (c) is a picture of an abnormal breathing alarm object;
FIG. 4 is a graph (a) of the output voltage of the self-powered respiration monitoring sensor of the present invention with respect to the vertical angle of the various upper layers of the membrane; graph (b) is an output voltage graph of the angle between the direction of the respiratory airflow and the direction of the bottom surface of the device; FIG. (c) is a temperature calibration graph; FIG. d is a humidity calibration graph;
FIG. 5 is a graph of an output fitted surface of a self-powered respiration monitoring sensor of the present invention at different temperatures;
FIG. 6 is an output fitted surface of the self-powered respiration monitoring sensor of the present invention at different humidities;
FIG. 7 is a schematic diagram of a hardware circuit block of the present invention;
FIG. 8 is a PCB circuit board diagram of the hardware circuit module of the present invention;
fig. 9 is a schematic diagram of an operation process of the hardware circuit module according to the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention, the following description will explain the embodiments of the present invention with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
Example 1:
a self-powered respiration monitoring sensor as shown in figure 1 comprising a core flutter module and an external frame module; the core flutter module comprises a lower friction layer a, a lower electrode layer b, an upper friction electrode layer c and a substrate layer d, wherein the lower friction layer a, the lower electrode layer b, the upper friction electrode layer c and the substrate layer d have different friction sequences; the external frame module comprises a side rail e with round holes at two sides, a hollow copper support f and a substrate layer g. The upper friction electrode layer is adhered below the substrate layer; the lower electrode layer is adhered below the lower friction layer; the side columns are arranged on two sides of the substrate layer; the bottom layer of the lower electrode layer is adhered to the upper side of the substrate layer.
Further, the upper friction electrode layer and the substrate layer form an upper layer film through magnetron metal sputtering; the lower friction layer is a polytetrafluoroethylene film PTFE subjected to an ICP etching process; the lower electrode layer is a copper film with adhesiveness, and is adhered below the lower friction layer; the bottom layer of the lower electrode layer is adhered to the upper side of the substrate layer.
Furthermore, a gap with the same width as the upper friction electrode layer is arranged in the middle of the hollow copper support; one part of the upper friction electrode layer is fixed in the hollow copper support in a curling shape, and the other part of the upper friction electrode layer extends out of the gap of the hollow copper support and is in contact with the lower friction layer; and two ends of the hollow copper support are respectively positioned in the round holes of the two side rails.
Further, an included angle alpha of 45 degrees is formed between the upper friction electrode layer and the vertical direction in an initial state; an included angle beta of 30 degrees is formed between the respiratory airflow direction and the bottom surface direction of the self-powered respiration monitoring sensor.
Further, the side rails are PMMA films, and the PMMA films are streamline; the side rail is tightly adhered to the substrate layer.
Furthermore, the hollow copper support is connected with the upper friction electrode layer to form an upper electrode layer.
The self-powered respiration monitoring sensor of the invention mainly depends on the respiratory flow to drive the flutter motion of the upper friction electrode layer, and completes the contact separation process to generate output voltage, as shown in figure 1. The upper layer membrane naturally sags and contacts with the lower layer membrane in an initial state, the upper friction electrode layer is separated from the lower friction layer during expiration and generates flutter along with airflow, and voltage waveforms with different frequencies are generated at different respiration intensities; when breathing in, the contact area between the upper friction electrode layer and the lower friction layer is increased, so that electrons flow, and when breathing out again, a potential difference is generated. Self-powered respiration monitoring sensors are located where the respiratory airflow is most concentrated, and two sensors are mounted on the sub-nasal skin to detect different conditions in each naris.
The working principle of the invention is based on a friction power generation mechanism and a wind-induced vibration theory, respiratory airflow enters through the fixed end of the device, and the upper layer membrane triggers flutter and causes membrane vibration along with the increase of the flow rate of the respiratory airflow. The vibration frequency is dependent on the air flow velocity and the mass ratio, which is linearly related to the air flow velocity at a certain time. As the gas flow velocity increases to a critical velocity, the film begins to periodically flutter; further increasing the gas flow rate starts the membrane system to flutter and the device output voltage and current response increases. The two friction layers generate contact separation movement with different frequencies along with different air flow speeds in an expiration state, and voltage output signals with different amplitudes and frequencies are generated; when inhaling, the two friction layers are continuously contacted and generate stable voltage signals along with the continuous increase of the contact area, and the stable frequency of the signals is obviously different from that of the exhalation signals, so that the exhalation and inhalation processes of the human body can be distinguished. The two electrode layers are led out by leads and connected to an electrometer to observe the final waveform, so that the real-time respiratory waveform data of the human body can be obtained.
As shown in fig. 4, the hollow copper stent generates micro-flutter along with the airflow during breathing, and the maximum electric output response can be obtained by combining with the initial included angle. Because the performance of the traditional respiration sensor is attenuated quickly under the influence of the environment, the upper layer film is designed to be embedded into the hollow copper support in a curled shape for storage, and the part in contact with the lower layer film is extracted and replaced when the device is worn greatly, as shown in figure 2.
The invention also provides a respiration monitoring system, which comprises a self-powered respiration monitoring sensor;
the hardware processing module is used for controlling signal transmission;
the hardware processing module comprises an impedance matching module, a level adjusting module, a main control module and a wireless transmission module;
the interaction module based on the QT upper computer is used for realizing real-time display and parameter extraction of the respiratory signals;
the APP human-computer interaction module is used for extracting the frequency, the depth, the AHI index and the expiratory peak flow rate value FEP of the respiratory signal and sending the frequency, the depth, the AHI index and the expiratory peak flow rate value FEP to the cloud platform to be shared to the medical institution in real time;
and the analysis module is used for obtaining the information of the breathing depth and the airflow velocity by analyzing the real-time frequency and the amplitude of the generated voltage output.
Furthermore, the respiration monitoring system also comprises a lead led out from the upper friction electrode layer, a lead led out from the lower electrode layer and a cloud platform data processing terminal for sharing and storing data.
The invention also designs an interactive module and an APP human-computer interactive module which are matched with the self-powered respiration monitoring sensor and are based on the QT upper computer. The upper computer based on QT designs the double-thread data processing and curve display interface, designs the main thread and the slave thread respectively for collecting, processing and displaying feedback, and simultaneously can also realize the function of controlling the sound equipment to switch songs by the self-powered respiration monitoring sensor driven by airflow. The APP human-computer interaction module can wirelessly receive and display the respiratory signal and extract waveform characteristic quantities thereof, such as respiratory frequency, expiratory airflow peak value, respiratory depth, respiratory hypopnea index and the like, as shown in fig. 3. The APP human-computer interaction module can also analyze each characteristic quantity, intelligently identify different potential diseases, alarm, bounce window and acousto-optic alarm prompt, has the functions of identifying diseases such as sleep apnea syndrome, rhinitis and chronic pulmonary obstruction, can calibrate respiratory signals of a human body in a motion state, specifically filters clutter generated in a motion process through the relevant filtering and voltage stabilizing module, and avoids the occurrence of false alarm in the motion process. Meanwhile, the output signals of the sensor can be calibrated under different temperature and humidity conditions, and the output signals are more accurate by compensating corresponding calibration parameters, as shown in fig. 5 and 6.
The invention also provides a preparation method of the self-powered respiration monitoring sensor, which comprises the following steps:
s1, cutting a piece of copper film from the copper foil tape, and then bonding the copper film and the polytetrafluoroethylene film together to form an upper friction electrode layer;
wherein the size of the copper film is 1.6cm multiplied by 1.0cm multiplied by 0.01 cm; the polytetrafluoroethylene film had dimensions of 1.6cm by 1.0cm by 0.03 cm.
S2, depositing a layer of aluminum on the substrate layer in a magnetron metal sputtering mode to form a lower electrode layer, and simultaneously processing a Polytetrafluoroethylene (PTFE) film of a lower friction layer by adopting an ICP (inductively coupled plasma) etching process;
s3, cutting the PMMA film into streamline shapes by laser cutting, and taking the streamline shapes as side fences to be tightly adhered to two sides of the substrate layer;
the substrate layer has internal dimensions of 1.6cm x 1.0cm x 0.05cm, creating the main structure for the sensor.
S4, adopting a PDMS film as a substrate layer, attaching a lower electrode layer on the substrate layer through a pressure-sensitive adhesive, and fixing and leading out a lead between the substrate layer and the lower electrode layer;
and PDMS is adopted as an elastic substrate, so that the system stability and the user comfort can be improved.
And S5, partially curling the upper friction electrode layer, embedding the upper friction electrode layer into the hollow copper bracket, extending the other part out of the hollow copper bracket to be in contact with the lower friction layer, and connecting and leading out a lead wire with the hollow copper bracket.
As shown in fig. 7-9, a method of assembling a respiratory monitoring system includes the steps of:
connecting a lead wire led out from the lower electrode layer to a signal GND input pin of the hardware circuit module, and connecting a lead wire led out from the upper friction electrode layer to a signal positive input pin of the hardware circuit module;
the self-powered respiration monitoring sensor is adhered to the lower part of the nostril of a human body, a lead wire led out is adhered to the skin behind the ear of the human body, and the miniature hardware circuit module (the impedance matching module, the level adjusting module, the main control module and the wireless transmission module) can be placed at any position;
and the Bluetooth connection function of the upper computer and the mobile phone APP is opened, so that the processes of acquisition, analysis and the like of the breathing signal of the human body can be completed, and the system assembly is completed.
Fig. 8 is a schematic diagram of the PCB circuit board after being packaged according to the schematic diagram of the hardware circuit module of fig. 7. And welding according to the device marks on the figure 8, and welding the required electronic components to the PCB.
As shown in fig. 9, the operation process of the hardware circuit module is as follows:
the self-powered respiration monitoring sensor collects airflow exhaled by a human body from nostrils, the collected data are transmitted to the hardware circuit module, the hardware circuit module carries out data processing, the calculated data are transmitted to the mobile device through the Bluetooth module, and a user obtains real-time respiration physiological parameters through information displayed on the mobile device.
The self-powered respiration monitoring sensor adopts multi-state measurement to collect output responses of devices under different temperature and humidity environments and different airflow flow rates, and carries out surface fitting on the states of the devices under different environments through Matlab software to obtain a polynomial expression of the humidity and temperature output characteristics of the devices. The self-powered respiration monitoring sensor also has a self-calibration function, different output responses of the sensor are driven by a large amount of airflow in advance, device output responses under different gas flow rates based on ambient humidity and temperature are recorded, and different calibration curved surfaces related to device output, different airflow flow rates, temperature and humidity are established, so that calibration factors are provided for the sensor under different environments, and the output stability of the sensor is improved. Meanwhile, a mechanical calibration function is designed, the alarm threshold value is improved under the condition of mechanical motion, and the condition of false alarm generated by the system is avoided.
The foregoing has outlined, rather broadly, the preferred embodiment and principles of the present invention in order that those skilled in the art may better understand the detailed description of the invention without departing from its broader aspects.

Claims (9)

1. A self-powered respiration monitoring sensor, comprising a core flutter module and an external frame module; the core flutter module is fixed on the external frame module; the core flutter module comprises a lower friction layer, a lower electrode layer, an upper friction electrode layer and a substrate layer; the upper friction electrode layer is adhered below the substrate layer; the lower electrode layer is adhered below the lower friction layer; the upper friction electrode layer is positioned above the lower friction layer.
2. A self-powered respiration monitoring sensor according to claim 1 wherein the upper triboelectric layer forms an upper film with the substrate layer by magnetron metal sputtering; the lower friction layer is a polytetrafluoroethylene film which is subjected to an ICP etching process; the lower electrode layer is a copper film with adhesiveness.
3. A self-powered respiration monitoring sensor according to claim 1 wherein said external frame module comprises a side rail with circular holes on both sides, a hollow copper support on said side rail and a substrate layer; the side columns are arranged on two sides of the substrate layer; the bottom layer of the lower electrode layer is adhered to the upper side of the substrate layer.
4. A self-powered respiration monitoring sensor according to claim 3 wherein the hollow copper support has a gap in the middle of the support that is the same width as the upper friction electrode layer; one part of the upper friction electrode layer is fixed in the hollow copper support in a curling shape, and the other part of the upper friction electrode layer extends out of the gap of the hollow copper support and is in contact with the lower friction layer; and two ends of the hollow copper support are respectively positioned in the round holes of the two side rails.
5. A self-powered respiration monitoring sensor according to claim 1 wherein said upper triboelectric layer is disposed at a 45 ° angle α to the vertical initial state; an included angle beta of 30 degrees is formed between the respiratory airflow direction and the bottom surface direction of the self-powered respiration monitoring sensor.
6. A self-powered respiration monitoring sensor according to claim 1 wherein said side rail is a PMMA film, said PMMA film being in the form of a streamline; the side rail is tightly adhered to the substrate layer.
7. A method of making a self-powered respiration monitoring sensor according to claim 4 comprising the steps of:
s1, cutting a piece of copper film from the copper foil tape, and then bonding the copper film and the polytetrafluoroethylene film together to form an upper friction electrode layer;
s2, depositing a layer of aluminum on the substrate layer in a magnetron metal sputtering mode to form a lower electrode layer, and simultaneously processing the polytetrafluoroethylene film of the lower friction layer by adopting an ICP (inductively coupled plasma) etching process;
s3, cutting the PMMA film into streamline shapes by laser cutting, and taking the streamline shapes as side fences to be tightly adhered to two sides of the substrate layer;
s4, adopting a PDMS film as a substrate layer, attaching a lower electrode layer on the substrate layer through a pressure-sensitive adhesive, and fixing and leading out a lead between the substrate layer and the lower electrode layer;
and S5, partially curling the upper friction electrode layer, embedding the upper friction electrode layer into the hollow copper bracket, extending the other part out of the hollow copper bracket to be in contact with the lower friction layer, and connecting and leading out a lead wire with the hollow copper bracket.
8. A respiration monitoring system comprising a self-powered respiration monitoring sensor according to any one of claims 1-6;
the hardware processing module is used for controlling signal transmission;
the interaction module based on the QT upper computer is used for realizing real-time display and parameter extraction of the respiratory signals;
the APP human-computer interaction module is used for extracting the frequency, the depth, the AHI index and the expiratory peak flow rate value FEP of the respiratory signal and sending the frequency, the depth, the AHI index and the expiratory peak flow rate value FEP to the cloud platform to be shared to the medical institution in real time;
and the analysis module is used for obtaining the information of the breathing depth and the airflow velocity by analyzing the real-time frequency and the amplitude of the generated voltage output.
9. The respiration monitoring system of claim 8, further comprising a lead from the upper friction electrode layer, a lead from the lower electrode layer, and a cloud platform data processing terminal for sharing and storing data.
CN202210367244.8A 2022-04-08 2022-04-08 Self-powered respiration monitoring sensor, preparation method thereof and respiration monitoring system Pending CN114847924A (en)

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