CN107811616A - A kind of flexible many reference amounts human body physical sign detector and its application method - Google Patents

Abstract

The invention provides a flexible multi-parameter human body sign detector. The detector integrates a flexible substrate, a flexible electrode, a pulse sensor and a processing circuit, monitors the pulse through the pulse detector, and tests the impedance of the human body through the conductive electrode; by stretching the detector, preferably with an extender, different positions of the human body can be measured of impedance. Compared with the existing technology, the detector can be stretched, twisted, folded and other deformations, and can be tested for human body impedance and pulse signs. It has the characteristics of portability and comfort. It has a good application prospect.

Description

A flexible multi-parameter human body sign detector and its application method

technical field

The invention relates to the field of human body sign detection, in particular to a flexible multi-parameter human body sign detector and a method for using the same.

Background technique

With the development of the Internet of Things, smart healthcare has attracted more and more attention. The core of smart medical care is to realize the detection of human body signs. The core of this function is portable and wearable health equipment, which integrates intelligent collection, intelligent storage and classification, intelligent interaction and intelligent processing of human health information. , will trigger a new round of revolution in electronics.

Original portable and wearable health devices occupy a vital position in the competition of smart medical care for major future application needs, and are the key to enhancing our country's creative core competitiveness. The biggest requirement for portable and wearable health equipment is the perfect fit with the human body, skin and other organs, which can only rely on soft and bendable new electronic devices, namely flexible electronic devices, which have all the traditional electronic devices do not have Unique advantages, such as: can be bent and deformed, can be attached to any shape of surface, can reduce the impact of external impact, can be used in a large area, and has lighter weight and lower cost. In 2000, Science magazine listed flexible electronics and genomics as the top ten emerging technologies in the 21st century. In 2010, the world-renowned electronic technology journal "Electronic Engineering Times" (EE TIMES) also listed flexible electronics as one of the "Top Ten Emerging Technologies in the World".

The emergence of Google Glass has made people pay more and more attention to wearable devices, from the original Google Glass to the current smart helmet, smart watch, smart bracelet and other equipment, from the initial sports step counting function to the current pulse monitoring and heartbeat monitoring , GPS navigation and other functions, the types and functions of wearable devices have become more and more abundant and more and more intelligent. However, the existing wearable devices on the market are not really flexible devices, nor are they compatible with the human body, such as smart watches, which integrate stress sensors, acceleration sensors, magnetic sensors, etc. on the basis of existing watches made, but these sensors are rigid sensors.

Ideal portable and wearable devices are compatible with the human body and have flexible characteristics, such as: being able to bend, stretch, fit on human skin and other organs, and be implanted in clothing. In addition, since the human body has various signs, such as pulse, body impedance, blood pressure, etc., integrating multi-parameter human body sign detection functions in flexible detectors will improve its intelligence.

Contents of the invention

Aiming at the development status and trend of portable and wearable devices, the present invention provides a flexible multi-parameter human body sign detector, which can detect the impedance and pulse waveform sign information of the human body, and can be stretched, twisted, folded and other deformations .

The technical solution of the present invention is: a flexible multi-parameter human body sign detector, including a flexible substrate, a pulse sensor, a first conductive electrode, a second conductive electrode, a flexible electrode, and a processing circuit.

The flexible base is made of an insulating elastomer material (in order to distinguish it from the elastomer material hereinafter, this elastomer material is referred to as the first elastomer material), which can be deformed under the action of an external force. The first elastomer material can be a thermoplastic elastomer or a thermosetting elastomer material, including but not limited to silica gel, polydimethylsiloxane (PDMS), rubber, hydrogel, polyurethane, SEBS, POE, etc. one or more of them.

The flexible electrode has electrical conductivity and is composed of liquid metal and an elastomeric material (in order to distinguish it from the elastomeric material above, the elastomeric material is called a second elastomeric material).

The liquid metal is a metal conductive material that is liquid at room temperature, including but not limited to mercury, gallium indium alloy, gallium indium tin alloy, and one or more doped gallium of transition metals and solid non-metallic elements Indium alloy, gallium indium tin alloy, etc.

The second elastomer material can be deformed under the action of external force, and can be a thermoplastic elastic material or a thermosetting elastomer material, including but not limited to silica gel, polydimethylsiloxane (PDMS), rubber, water One or more of gel, polyurethane, SEBS, POE, etc.

As a structure of the flexible electrode, the liquid metal is poured into the tubular second elastomer material. When the first elastomer material is the same as the second elastomer material, the present invention provides a method for preparing the flexible electrode, specifically: when the flexible substrate is formed, the mold is used to leave a tubular electrode at the position where the flexible electrode needs to be prepared. hole; liquid metal is then poured into the tubular hole at room temperature.

As another structure of the flexible electrode, the liquid metal particles are dispersed in the second elastomer material. The invention provides a method for preparing the flexible electrode, specifically as follows:

When the second elastomer material is solid at normal temperature and heated and melted, the heated and melted second elastomer material is stirred and mixed evenly with the liquid metal to form a mixture; then, the mixture is coated or poured on the flexible substrate, Flexible electrodes are formed after cooling and curing.

When the second elastomer material is liquid at room temperature and heated and solidified, at room temperature, the liquid metal and the liquid second elastomer are stirred and mixed evenly to form a mixture; then, the mixture is coated or poured on the flexible substrate On, flexible electrodes are formed after heating and curing.

The flexible electrode is fixed on the flexible base, one end of the flexible electrode is connected to the first conductive electrode through a processing circuit, and the other end of the flexible electrode is connected to the second conductive electrode.

The processing circuit includes an AC signal generation module, a signal processing module and a control module (MCU); the AC signal generation module is connected to the first conductive electrode; one end of the flexible electrode is connected to the signal processing module, and the other end is connected to the second conductive electrode connected.

Under the condition of power supply and control module control, the AC signal generation module generates a waveform of specific frequency and amplitude to stimulate the external impedance, and forms a closed loop through the first conductive electrode, the human body, the second conductive electrode, and the flexible electrode, and the excitation results in an impedance response signal, the impedance response signal is processed by the signal processing module to obtain the magnitude of the impedance.

As an implementation, the AC signal generation module includes a power supply, a direct digital synthesizer (DDS), a digital-to-analog converter (DAC), and an integrated amplifier circuit; one end of the DDS is connected to the MCU, and the other end of the DDS is connected to the DAC The other end of the DAC is connected to the integrated amplifier circuit.

As an implementation, the signal processing module includes a gain amplifier circuit, an analog-to-digital converter (ADC), and a digital signal processing module (DSP); one end of the gain amplifier circuit is connected to the flexible electrode, and the other end One end of the ADC is connected, the other end of the ADC is connected to the DSP, and the other end of the DSP is connected to the MCU; the gain amplifier circuit is sampled by the ADC, and the ADC transmits the signal to the DSP for digital processing, and outputs its real part after discrete Fourier transform. The imaginary part is sent to the MCU, and the external impedance is calculated by the MCU.

The pulse sensor is connected to the flexible substrate, the first conductive electrode or the second conductive electrode, and is used to measure the pulse signal of the human body.

The pulse sensor is divided into non-contact type and contact type. Non-contact includes but not limited to photoelectric sensors and the like. The contact type includes but is not limited to a contact piezoresistive sensor, a contact piezocapacitive sensor, a contact piezoelectric sensor, a contact piezomagnetic sensor, and the like. When the pulse sensor is a contact type, the pulse sensor is in contact with human skin. When the pulse sensor is a photoelectric sensor, the photoelectric sensor is not in contact with the skin. At this time, a through hole is opened on the flexible substrate, the first conductive electrode or the second conductive electrode, and the light emitted by the photodetector irradiates the skin through the through hole for detection.

Preferably, the elongation rate of the flexible substrate is greater than 150%, and the Young's modulus is less than 100 MPa.

Preferably, the elongation rate of the flexible electrode is greater than 150%.

Preferably, the stretch rate of the flexible electrode is greater than the stretch rate of the flexible substrate.

Preferably, the processing loop further includes a bluetooth module connected to the MCU for wireless communication of impedance information.

Preferably, the pulse sensor is located on the first conductive electrode.

When using the flexible multi-parameter human body sign detector of the present invention, the first conductive electrode and the second conductive electrode are respectively placed in different positions of the human body, and the power is turned on to measure the distance between the first conductive electrode and the second conductive electrode. Impedance information of the human body, while the pulse signal can be measured by the pulse sensor. Since the flexible substrate and the flexible electrode have deformability such as bending, stretching, and torsion, the position of the first conductive electrode and the second conductive electrode can be adjusted to achieve a high fit between the detector and the human skin, and measure the distance between different parts of the human body. Between the impedance information, and pulse information.

In actual use, for the sake of portability, the length of the flexible electrode is limited. In this case, an extender can be designed to extend the length of the flexible electrode, so as to facilitate the measurement of parameters between long-distance sites. At this time, the flexible multi-parameter human body sign detector further includes a conductive joint, which is electrically connected to the flexible electrode, preferably to an end of the flexible electrode close to the second conductive electrode. The extender includes a flexible base A, a flexible electrode A, a second conductive electrode A and a conductive joint A; the flexible electrode A is fixed on the flexible base A, one end of the flexible electrode A is connected to the conductive joint A, and the other end is connected to the second Two conductive electrodes A; when in use, connect the conductive joint A in the extender to the conductive junction of the flexible multi-parameter human body sign detector.

Similar to the flexible base, the flexible base A is made of insulating elastomer material, which can be deformed under the action of external force. Preferably, the material of the flexible substrate A is the same as that of the flexible substrate.

Similar to the flexible electrode described above, the flexible electrode A has electrical conductivity and is composed of liquid metal and elastomer materials. Preferably, the material and structure of the flexible electrode A are the same as the flexible electrode.

The material and function of the second conductive electrode A are similar to those of the second conductive electrode. Preferably, the material of the second conductive electrode A is the same as that of the second conductive electrode.

In summary, the present invention integrates flexible substrates, flexible electrodes, pulse sensors and processing circuits to form a flexible multi-parameter human body sign detector. The pulse is monitored by the pulse detector; the human body impedance is tested by the conductive electrode, and the ECG (electrocardiogram) signal of the human body can be measured; the impedance of different positions of the human body can be measured by stretching the detector, preferably with an extender, such as: When the conductive electrodes are attached to the human belly, the impedance can be measured, which reflects the fat content. Compared with the prior art, the flexible multi-parameter human body sign detector of the present invention can be stretched, twisted, folded and other deformations, and can be tested for human body impedance and pulse signs. It has a good application prospect in monitoring and fat content detection.

Description of drawings

Fig. 1 is a schematic structural diagram of a flexible multi-parameter human body sign detector in Embodiment 1 of the present invention;

Fig. 2 is a schematic structural view of the extender of the flexible multi-parameter human body sign detector in Embodiment 1 of the present invention;

Fig. 3 is a structural block diagram of a processing circuit in Embodiment 1 of the present invention.

Reference numerals in FIGS. 1-2 are: 1 flexible substrate, 2 first conductive electrode, 3 pulse sensor, 4 processing circuit, 5 second conductive electrode, 6 flexible electrode, 7 conductive joint.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be pointed out that the following examples are intended to facilitate the understanding of the present invention, but do not limit it in any way.

Example 1:

As shown in Figure 1, the flexible multi-parameter human body sign detector in the present embodiment 1 includes a flexible substrate 1, a first conductive electrode 2, a pulse sensor 3, a processing circuit 4, a second conductive electrode 5, a flexible electrode 6, and Conductive joint 7.

Wherein, the first conductive electrode 2 , the processing circuit 4 , the second conductive electrode 5 , and the flexible electrode 6 are fixedly connected to the flexible substrate 1 . The pulse sensor 3 is mounted inside the first conductive electrode 2 .

The flexible base material in this embodiment is polydimethylsiloxane (PDMS), an elastomeric material.

In this embodiment, the flexible electrode 6 is composed of liquid alloy gallium indium tin and elastomer material PDMS. At room temperature, the alloy gallium indium tin is liquid. And, the liquid metal is poured into the tubular elastomer material PDMS.

The pulse sensor 3 in this embodiment is a photoelectric sensor, and a through hole is opened on the first conductive electrode 2. The photoelectric sensor does not contact the human skin, and the light emitted is irradiated on the human skin through the through hole for detection.

In this embodiment, the processing circuit 4 includes an AC signal generating module, a signal processing module and a control module (MCU).

The AC signal generation module includes a direct digital frequency synthesizer (DDS), a digital-to-analog converter (DAC), and an integrated amplifier circuit; one end of the DDS is connected to the MCU, the other end of the DDS is connected to the DAC, and the other end of the DAC is connected to the integrated amplifier circuit. connect. The output end of the AC signal generating module is connected to the first conductive electrode 2 .

The signal processing module includes a gain amplifier circuit, an analog-to-digital converter (ADC), and a digital signal processing module (DSP). One end of the gain amplification circuit is connected to the flexible electrode 6 , the other end is connected to one end of the ADC, the other end of the ADC is connected to the DSP, and the other end of the DSP is connected to the MCU.

One end of the flexible electrode 6 is connected to the gain amplifier circuit, and the other end is connected to the first conductive electrode 5 .

Under the condition of power supply, the MCU controls the DDS to generate a specific frequency and amplitude waveform through the DAC and the integrated amplifier circuit to stimulate the external impedance. The closed loop is formed through the first conductive electrode, the human body, the second conductive electrode, and the flexible electrode, and the excitation is weak. Impedance response signal, the weak impedance response signal is sampled by ADC through the gain amplifier circuit, the output of ADC is sent to DSP for digital processing, after discrete Fourier transform, the real part and imaginary part are output to MCU, and the external impedance is calculated by MCU size.

In this embodiment, the processing circuit 4 further includes a Bluetooth module, and the MCU transmits the magnitude of the external impedance to the Bluetooth module to communicate with the host computer.

The power supply is respectively connected with the MCU, the bluetooth module and the AC signal generating module to supply power.

In this embodiment, the preparation method of the flexible multi-parameter human body sign detector is as follows:

When the flexible substrate is molded, the mold is used to leave a tubular hole at the position where the elastic electrode 6 needs to be prepared. At the same time, the mold is used to reserve the positions of the first conductive electrode 2, the second conductive electrode 5 and the processing circuit 4, and the second conductive electrode 5 1. The lead wire of the processing circuit 4 is connected to the tubular hole; then, the gallium-indium-tin alloy which is liquid at room temperature is poured into the tubular hole, and the conductive joint 7 is directly sealed in the tubular hole.

In this embodiment, the elongation rate of the flexible substrate 1 is greater than 150%, and the Young's modulus is less than 100 MPa. The stretch rate of the flexible electrode 6 is greater than 150%, and the stretch rate of the elastic electrode 6 is greater than that of the flexible substrate 1 .

In this embodiment, in order to extend the elastic electrode, the flexible multi-parameter human body sign detector also includes an extender, as shown in Figure 2, the extender includes a flexible base 1, a second conductive electrode 5, a flexible electrode 6, and a conductive joint 7. Wherein, the second conductive electrode 5 , the flexible electrode 6 and the conductive joint 7 are fixed on the flexible substrate 1 , one end of the flexible electrode 6 is connected to the conductive joint 7 , and the second conductive electrode 5 is connected to the position close to the other end. When in use, the conductive joint 7 of the extender is connected with the conductive joint 7 of the detector to realize the extension of the detector.

When the flexible multi-parameter human body sign detector is used, the first conductive electrode and the second conductive electrode are placed in different positions of the human body, and the power is turned on to measure the body impedance between the first conductive electrode and the second conductive electrode. Information, while using the pulse sensor can measure the pulse signal. For example: when the first conductive electrode and the second conductive electrode are attached to different positions of the human belly, the impedance can be measured to reflect the fat content, which is helpful for monitoring the effect of weight loss.

Since the flexible substrate and the flexible electrode have deformability such as bending, stretching, and torsion, the placement positions of the first conductive electrode and the second conductive electrode can be adjusted to achieve a high fit between the detector and human skin, and measure different parts of the human body. Impedance information, as well as pulse information, are communicated wirelessly via Bluetooth technology. In addition, the flexible multi-parameter human body sign detector has the characteristics of portability and comfort, and has good application prospects in human health monitoring and fat content detection.

Example 2:

In this embodiment, the structure of the flexible multi-parameter human body sign detector is basically the same as that of the flexible multi-parameter human body sign detector in Embodiment 1, the difference is that in the flexible electrode 6, liquid metal is poured into the tubular The elastomer material PDMS, but with liquid metal particles dispersed in the elastomer material PDMS.

In this embodiment, the preparation method of the flexible multi-parameter human body sign detector is as follows:

The gallium indium tin alloy which is liquid at room temperature and the PDMS material which is liquid at room temperature are stirred and mixed evenly to form a mixture; then, the mixture is coated or poured on the flexible substrate, and the flexible electrode 6 is formed after heating and curing; after that, A first conductive electrode 2 , a second conductive electrode 5 and a processing circuit 4 are prepared on a flexible substrate 1 .

In this embodiment, the usage method of the flexible multi-parameter human body sign detector is the same as that in Embodiment 1, and will not be repeated here.

The embodiments described above have described the technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. All within the scope of the principles of the present invention Any modifications and improvements made should be included within the protection scope of the present invention.

Claims (11)

1. A flexible multi-parameter human body sign detector, characterized in that it includes a flexible substrate, a pulse sensor, a first conductive electrode, a second conductive electrode, a flexible electrode, and a processing circuit; said flexible substrate is comprised of an insulating first elastomeric material; The flexible electrode has electrical conductivity and is composed of liquid metal and a second elastomer material; The flexible electrode is fixed on a flexible substrate; The pulse sensor is connected to the flexible substrate, the first conductive electrode or the second conductive electrode; The processing circuit includes an AC signal generation module, a signal processing module and a control module; the AC signal generation module is connected to the first conductive electrode; one end of the flexible electrode is connected to the signal processing module, and the other end is connected to the second conductive electrode; Under the condition of power supply and control module control, the AC signal generation module generates a waveform of specific frequency and amplitude to stimulate the external impedance, and forms a closed loop through the first conductive electrode, the human body, the second conductive electrode, and the flexible electrode, and the excitation results in an impedance response signal, the impedance response signal is processed by the signal processing module to obtain the magnitude of the impedance. 2. The flexible multi-parameter human body sign detector according to claim 1, characterized in that: the first elastomer material includes silica gel, polydimethylsiloxane, rubber, hydrogel, polyurethane, SEBS, POE one or more of them; The second elastomer material includes one or more of silica gel, polydimethylsiloxane, rubber, hydrogel, polyurethane, SEBS, and POE. 3. The flexible multi-parameter human body sign detector according to claim 1, characterized in that: said liquid metal includes mercury, gallium indium alloy, gallium indium tin alloy, and one of transition metals and solid non-metallic elements Or several doped gallium indium alloys, gallium indium tin alloys. 4. The flexible multi-parameter human body sign detector according to claim 1, characterized in that: in the flexible electrode, the liquid metal is poured into the tubular second elastomer material; Preferably, the first elastomer material is the same as the second elastomer material, and the preparation method of the flexible electrode is: when the flexible substrate is molded, a mold is used to leave a tubular hole at the position where the flexible electrode needs to be prepared; Liquid metal is poured into the tubular hole at room temperature. 5. The flexible multi-parameter human body sign detector according to claim 1, characterized in that: in the flexible electrode, liquid metal particles are dispersed in the second elastomer material; As preferably, the preparation method of described flexible electrode is as follows: When the second elastomer material is solid at normal temperature and heated and melted, the heated and melted second elastomer material is stirred and mixed evenly with the liquid metal to form a mixture; then, the mixture is coated or poured on the flexible substrate, Flexible electrodes are formed after cooling and curing; When the second elastomer material is liquid at room temperature and heated and solidified, at room temperature, the liquid metal and the liquid second elastomer are stirred and mixed evenly to form a mixture; then, the mixture is coated or poured on the flexible substrate On, flexible electrodes are formed after heating and curing. 6. The flexible multi-parameter human body sign detector as claimed in claim 1, is characterized in that: said AC signal generating module includes a power supply, a direct digital frequency synthesizer, a digital-to-analog converter, and an integrated amplifier circuit; the direct digital frequency One end of the synthesizer is connected with the control module, the other end of the direct digital frequency synthesizer is connected with the digital-analog converter, and the other end of the digital-analog converter is connected with the integrated amplifier circuit. 7. The flexible multi-parameter human body sign detector as claimed in claim 1 is characterized in that: the signal processing module includes a gain amplifier circuit, an analog-to-digital converter, and a digital signal processing module; the gain amplifier circuit One end is connected with the flexible electrode, the other end is connected with one end of the analog-digital converter, the other end of the analog-digital converter is connected with the digital signal processing module, and the other end of the digital signal processing module is connected with the control module. 8. The flexible multi-parameter human body sign detector according to claim 1, characterized in that: when the pulse sensor is classified into a photoelectric sensor, there are through holes on the flexible substrate, the first conductive electrode or the second conductive electrode , the light emitted by the photodetector is detected by illuminating the skin through the through hole. 9. The flexible multi-parameter human body sign detector according to claim 1, characterized in that: the elongation rate of the flexible substrate is greater than 150%, and the Young's modulus is less than 100MPa; Preferably, the stretch rate of the flexible electrode is greater than 150%; Preferably, the stretch rate of the flexible electrode is greater than the stretch rate of the flexible substrate. 10. The flexible multi-parameter human body sign detector according to any one of claims 1 to 9, characterized in that: it also includes an extender, and the extender includes a flexible base A, a flexible electrode A, a second conductive electrode A and the conductive joint A; the flexible electrode A is fixed on the flexible substrate A, one end of the flexible electrode A is connected to the conductive joint A, and the second conductive electrode A is connected to the position close to the other end; When in use, connect the conductive connector A in the extender to the conductive junction of the flexible multi-parameter human body sign detector. 11. The method of using the flexible multi-parameter human body sign detector according to any one of claims 1 to 9, characterized in that: the first conductive electrode and the second conductive electrode are respectively placed at different positions of the human body, and the The power supply measures the impedance information of the human body between the first conductive electrode and the second conductive electrode, and simultaneously uses the pulse sensor to measure the pulse signal.