Biological impedance measuring equipment

Abstract

The utility model relates to biological impedance measuring equipment. An impedance measuring circuit comprises a controller; the electrode pair comprises an exciting electrode and a measuring electrode, the exciting electrode is connected to the controller through an exciting output circuit, and the measuring electrode is connected to the controller through an impedance acquisition circuit; one end of the multi-way switch is connected to the controller, the other end of the multi-way switch is connected to the electrode pair, and the multi-way switch is used for responding to an instruction of the controller and selectively switching the measuring channels; and the at least two data transmission modules are electrically connected to the controller. The utility model relates to biological impedance measuring equipment which can comprise a shell and an impedance measuring circuit arranged in the shell. The biological impedance measuring equipment provided by the utility model overcomes the defect of single data transmission, and improves the real-time performance and reliability of data transmission.

Description

Technical Field

[0001] The utility model relates to the technical field of bioimpedance measurement, in particular to a bioimpedance measurement device. Background Art

[0002] Biological composition information contains a variety of physiological and pathological characteristics, and biological impedance is highly correlated with biological composition information. For example, human bioimpedance can be used to determine the composition of the human body, as well as to determine the cardiac output and respiratory rate of the human body. Accurate bioimpedance measurement helps to accurately characterize the condition of the organism, so the measurement of bioimpedance is very important.

[0003] CN220193008U discloses a human body impedance measurement circuit, including an MCU module, an excitation output module and an impedance acquisition module, one end of which is electrically connected to the MCU module and the other end of which is connected to each measuring electrode sheet, wherein the excitation output module includes an output coupling unit, an output multi-way selection unit, and port protection units connected in parallel to the corresponding output terminals of the multi-way selection unit, which are electrically connected from the corresponding I / O port of the single-chip microcomputer to the electrode sheet in sequence; the impedance acquisition module includes an impedance conversion unit, an input multi-way selection unit, an isolation unit and an operational amplifier unit, which are electrically connected from the electrode sheet to the corresponding I / O port of the single-chip microcomputer in sequence, and a USB communication module connected to the MCU module can enable the MCU module to communicate with the host computer, so that the measurement data can be displayed in the host computer software.

[0004] Most of the existing segmental impedance measurement methods based on BIA support only one transmission mode, namely serial port or USB interface. The transmission mode is relatively single and it is difficult to meet the needs of multiple data transmission methods. At the same time, the existing human body impedance measurement equipment does not support wireless and network transmission functions, and it is difficult for users to directly view real-time body composition data through mobile phones, etc. Therefore, it is very necessary to develop a multi-interface human body impedance measurement device.

[0005] In addition, on the one hand, there are differences in understanding among technical personnel in this field; on the other hand, the applicant studied a large number of documents and patents when making the present utility model, but due to space limitations, not all details and contents are listed in detail. However, this does not mean that the present utility model does not have the characteristics of these prior arts. On the contrary, the present utility model already has all the characteristics of the prior art, and the applicant reserves the right to add relevant prior art to the background technology. Utility Model Content

[0006] In view of the deficiencies of the prior art, the utility model provides a bioimpedance measurement device, aiming to solve at least one or more technical problems existing in the prior art.

[0007] To achieve the above object, the utility model provides an impedance measurement circuit, comprising:

[0008] A controller; a plurality of electrode pairs, the electrode pairs comprising at least one excitation electrode and at least one measuring electrode, wherein the excitation electrode is connected to the controller via an excitation output circuit, and the measuring electrode is connected to the controller via an impedance acquisition circuit; a multi-way switch, one end of which is connected to the controller and the other end is connected to the electrode pairs, for selectively switching impedance measurement channels in response to instructions from the controller; and at least two data transmission modules, electrically connected to the controller.

[0009] Preferably, the excitation output circuit comprises a waveform generator for outputting a waveform having a set frequency, one end of the waveform generator is connected to the controller, and the other end of the waveform generator is connected to the excitation electrode.

[0010] Preferably, the excitation output circuit further comprises a voltage-current converter, one end of the voltage-current converter is connected to the waveform generator, and the other end of the voltage-current converter is connected to the excitation electrode.

[0011] Preferably, the data transmission module includes at least two of an interface module, a USB communication module, a wired communication module and a wireless communication module.

[0012] Preferably, the impedance measurement circuit provided by the utility model also includes a signal processing circuit, which includes an amplifier circuit connected to the output end of the measuring electrode, a filter circuit connected to the output end of the amplifier circuit, and a digital-to-analog conversion circuit connected between the filter circuit and the controller.

[0013] Preferably, the impedance measurement circuit provided by the present invention may further include an audio module electrically connected to the controller.

[0014] Preferably, the impedance measurement circuit provided by the present invention may further include a reference resistor connected in series to the excitation output circuit.

[0015] Preferably, the impedance measurement circuit provided by the present invention may further include a power supply module electrically connected to the controller.

[0016] Preferably, the utility model also relates to a bioimpedance measurement device, which comprises a device housing and an impedance measurement circuit as described in the utility model and arranged in the device housing.

[0017] Preferably, the bioimpedance measurement device provided by the present invention can be any one of a human body scale, a smart terminal and a wearable device.

[0018] The utility model provides an impedance measurement circuit, which has a compact structure, simple hardware implementation, and strong practicality. The multi-interface bioimpedance measurement device provided by the utility model realizes human body impedance measurement data transmission based on a serial port, a USB interface, an Ethernet interface, a WIFI module, etc., forming a human body impedance measurement device that meets various application requirements. After the measurement is completed, different data transmission methods can be adopted according to different user requirements, thereby increasing the convenience, real-timeness, and reliability of data access and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a module block diagram of an impedance measurement circuit of a preferred embodiment provided by the utility model;

[0020] Figure 2 It is a circuit principle diagram of an impedance measurement circuit of a preferred embodiment provided by the utility model;

[0021] Figure 3 This is a circuit schematic diagram of segment impedance measurement according to a preferred embodiment of the present invention;

[0022] Figure 4 It is a schematic diagram of a human body contact bioimpedance measurement device according to a preferred embodiment of the present invention;

[0023] Figure 5 It is a schematic diagram of a wearable bioimpedance measurement device according to a preferred embodiment of the present invention.

[0024] Reference numerals list

[0025] 1: controller; 2: waveform generator; 3: excitation electrode; 4: measuring electrode; 5: multi-way switch; 6: reference resistor; 7: amplifier circuit; 8: filter circuit; 9: digital-to-analog conversion circuit; 10: interface module; 11: USB communication module; 12: wired communication module; 13: wireless communication module; 14: power module; 15: second humidity detection unit; 16: second temperature detection unit; 17: fourth humidity detection unit; 18: fourth temperature detection unit; 19: first humidity detection unit; 20: first temperature detection unit; 21: third humidity detection unit; 22: third temperature detection unit. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more explicit definition of the protection scope of the present invention. Although the accompanying drawings show exemplary embodiments of the present invention, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described here.

[0027] The utility model provides a bioimpedance measuring device. The bioimpedance measuring device can be used to measure the impedance of a biological object. Impedance is a measure of the reaction of the biological object to the measuring current. The impedance of the biological object can represent the composition of the biological body. For example, impedance can be used to determine the liquid (such as water) content, fat-free body mass or body weight in the biological body.

[0028] As an example, the bioimpedance measurement device provided by the utility model can be any one of a human body composition analyzer, a human body scale, a household appliance or a mobile terminal, or a terminal device such as a mobile phone, a tablet computer, a host computer, etc. In other optional modes, the bioimpedance measurement device can also be a wearable device. For example, the bioimpedance measurement device can be a smart garment or accessory, such as part or all of a bracelet, a headband, an armband, a chest strap or an eye mask. The embodiments of the utility model are not limited to this.

[0029] Figure 1 The module block diagram of the impedance measurement circuit provided by the utility model is shown. The impedance measurement circuit may include an impedance acquisition circuit, an excitation output circuit, a signal processing circuit, a data transmission module and an electrode pair. Specifically, Figure 1 As shown, the impedance measurement circuit may include a controller 1, a waveform generator 2, an excitation electrode 3, a measuring electrode 4, a multi-way switch 5, a reference resistor 6, an amplifier circuit 7, a filter circuit 8, a digital-to-analog conversion circuit 9, an interface module 10, a USB communication module 11, a wired communication module 12 and a wireless communication module 13.

[0030] Furthermore, the bioimpedance measuring device may include a housing and an impedance measuring circuit as described above disposed in the housing. Taking a human body scale as an example, the bioimpedance measuring device generally includes a device housing for fixing and supporting and a plurality of electrode pairs for measuring human body bioimpedance. Each electrode pair may include an excitation electrode 3 and a measuring electrode 4. Specifically, the excitation electrode 3 and the measuring electrode 4 may be a diaphragm made of a metal electrode sheet, an ITO film or other conductive material. In particular, if two electrode pairs (i.e., four electrodes) are configured, it can be used to measure body fat. If three electrode pairs (i.e., six electrodes) are configured, it can be used to measure heart rate. If four electrode pairs (i.e., eight electrodes) are configured, it can be used to perform more detailed measurements of body fat percentage and skeletal muscle content. For example, two of the electrode pairs are in contact with the feet, and the other two electrode pairs are in contact with the hands, respectively.

[0031] According to a preferred embodiment, the controller 1 can be a single chip microcomputer. The controller 1 is used as the core control module of the impedance measuring device, and is electrically connected or signal-connected to the impedance acquisition circuit, the excitation output circuit, the data transmission module and the signal processing circuit, so as to be used for issuing control instructions and processing the collected information. In particular, in order to ensure the normal operation of the main control chip, a crystal oscillator circuit and a reset circuit electrically connected to the wiring terminals corresponding to the controller 1 can be provided in the impedance measurement circuit of the present embodiment, so as to ensure the working timing and program operation of the main control chip. Specifically, in the utility model, the controller 1 mainly includes an STM32MP135 type main control chip.

[0032] In the embodiment of the utility model, the controller 1 generates a waveform signal with a specific frequency through the waveform generator 2, and obtains the excitation current after the VI conversion of the voltage-current converter. For example, the waveform generator 2 can be a sine signal generator, and the waveform signal with a specific frequency can be a sine waveform. As an example, the sine signal generator uses AD9850 as the frequency generation chip, and the excitation current generated by it uses AD844 to feedback the input voltage amplitude.

[0033] Furthermore, an excitation current is input to the excitation electrode 3 to provide an excitation signal to the excitation electrode 3. The excitation signal passes through the biological impedance network of the object under test and generates a voltage difference. The voltage difference can be measured by the measuring electrode 4, and then the bioimpedance value can be obtained after conversion, thereby realizing bioimpedance measurement.

[0034] Specifically, Figure 2 For example, the controller 1 generates a sinusoidal voltage signal through a waveform generator 2 (such as a DDS sinusoidal signal generating circuit). The sinusoidal voltage signal is converted by VI (i.e., through a voltage control power supply VCCS) to obtain an excitation current. The excitation current signal passes through an excitation electrode 3 in one set of electrode pairs, the human body, and another excitation electrode 3 in another set of electrode pairs and then returns to the excitation end, thereby forming an excitation current loop flowing through the human body. Then, by measuring the voltage across the measuring electrode 4 in different electrode pairs, the human body impedance data is finally obtained. The multi-way switch 5 (i.e., the electrode gating system) is responsible for selecting the measured voltage / current loop, and the RS reference resistor (which can be selected as 1000Ω) is connected in series to the excitation current loop. The measured voltage signal is sequentially input into the controller 1 (single-chip computer system) through a weak signal extraction circuit, a controllable gain amplifier circuit, and an effective value detection circuit. After conversion by an analog-to-digital converter, the processing chip uses the measured U and I values ​​to calculate the impedance of each segment of the human body.

[0035] For ease of understanding only, in the measurement of human body impedance, the impedance measuring device is taken as an example of a human body scale. The left foot can contact the excitation electrode 3 and the measuring electrode 4 of one set of electrode pairs, and the right foot can contact the excitation electrode 3 and the measuring electrode 4 of another set of electrode pairs. The controller 1 provides excitation signals to the two excitation electrodes 3 respectively through the waveform generator 2. The excitation signal generates a voltage difference through the human body impedance network, and the voltage difference is measured by the measuring electrodes 4 corresponding to the two excitation electrodes 3. After conversion, the human body impedance value is obtained. In the embodiment of the utility model, the bioimpedance measurement circuit can be consistent with the five-segment human body impedance measurement model, that is, the human body impedance is equivalent to the five segment impedances of the trunk, left upper limb, right upper limb, left lower limb, and right lower limb, see Figure 3 The multi-segment bioimpedance measurement method can refer to the prior art, and the present invention does not involve any improvement thereto, so it will not be described in detail here.

[0036] According to a preferred embodiment, the multi-way switch 5 is used to select the voltage and current loops to be measured. Usually, only one electrode sheet is used as an excitation output electrode and one electrode is used as an impedance measurement electrode at the same time. In order to select the electrode sheets, the utility model sets a multiplexer. During the measurement process, the controller 1 sends out corresponding control instructions, performs address encoding, and selects the corresponding multiplexer channel to be turned on to realize the acquisition and input of electrical signals. As an example, in the utility model, the multi-way switch 5 can use a MAX4582EEE+T four-channel 4:1 analog multiplexer. Compared with the existing MAX14778 dual-channel 4:1 analog multiplexer, only one MAX4582EEE+T is needed, which simplifies the complexity of the equipment structure design.

[0037] In some optional embodiments, the multi-way switch 5 may include a plurality of excitation switches, measurement switches and switching switches, respectively. For example, if two groups of electrode pairs (i.e., four electrodes, two excitation electrodes 3 and two measurement electrodes 4) are configured, the number of excitation switches, measurement switches and switching switches may be two, respectively. That is, the number of excitation switches, measurement switches and switching switches is usually consistent with the number of electrode pairs. As an example, each excitation electrode 3 can be connected to an excitation source via an excitation switch. Each measurement electrode 4 can be connected to an impedance acquisition circuit via a measurement switch. Each pair of excitation electrodes 3 and measurement electrodes 4 can be connected via a switching switch. These switches can be any one or a combination of field effect transistors, triodes and thyristors.

[0038] According to a preferred embodiment, the excitation electrode 3 can be connected to the controller 1 through an excitation output circuit. Specifically, the excitation output circuit may include a waveform generator 2 and a voltage-current converter. In some optional embodiments, the excitation output circuit also includes an output coupling module. For example, a photoelectric coupler is set at the output port of the main control chip, and the safety of the circuit operation can be improved through photoelectric isolation. As an example, the output coupling module can adopt a PS2801 photoelectric coupler.

[0039] According to a preferred embodiment, the measuring electrode 4 can be connected to the controller 1 through an impedance acquisition circuit. The impedance acquisition circuit collects the electrical signal of the organism to the main control chip through the measuring electrode 4, and the impedance information of the organism can be analyzed according to the excitation current signal and the collected electrical signal. In some optional methods, the impedance acquisition circuit may include an impedance conversion module, and the input negative and output ends of the impedance conversion module are short-circuited to form a voltage follower, which can achieve the role of impedance matching. As an example, the impedance conversion module can use an LMV321IDBVK operational amplifier.

[0040] According to a preferred embodiment, a signal processing circuit is provided at the output end of the measuring electrode 4 for processing the detected voltage signal. Figure 1 The signal processing circuit may include an amplifier circuit 7 connected to the output end of the measuring electrode 4 , a filter circuit 8 connected to the output end of the amplifier circuit 7 , and a digital-to-analog conversion circuit 9 connected between the filter circuit 8 and the controller 1 .

[0041] According to a preferred embodiment, the amplifier circuit 7 can be used to amplify the voltage signal detected by the measuring electrode 4. As an example, in the present invention, the amplifier circuit 7 can use the AD8221ARMZ instrumentation amplifier and the LTC6910-3ITS8 gain amplifier to extract and amplify the weak voltage signal output by the measuring electrode 4. Compared with the existing AD8221ARM, the size of the AD8221ARMZ is changed from 1.2mm×9.2mm×2.8mm to 3mm×3mm×0.85mm; compared with the existing LTC6910, the size of the LTC6910-3ITS8 is changed from 2.4mm*2.6mm*1.4mm to 4.2mm*1.2mm*1mm. The above improvements effectively improve the thickness of the device structure.

[0042] As a non-limiting example, the filter circuit 8 described in the present invention may use an LTC1560-1CS8 chip to filter out high-frequency noise in the measurement signal.

[0043] In some optional embodiments, the filter circuit 8 may be an RC circuit, which may include a fixed resistor and a capacitor, so that the external signal is filtered by the RC circuit and then input into the digital-to-analog conversion circuit 9. Further, the filter circuit 8 may also include a grounded capacitor, one end of which is grounded and the other end is electrically connected to the fixed resistor and the capacitor, respectively.

[0044] According to a preferred embodiment, the digital-to-analog conversion circuit 9 is used to convert the digital signal into an analog signal, and extract the effective value of the filter circuit signal and input it to the control chip. As an example, the digital-to-analog conversion circuit 9 can use an AD637JRZ type RMS-DC converter.

[0045] Optionally, a filter circuit 8 may be provided between the waveform generator 2 and the excitation electrode 3 to filter the excitation signal generated by the waveform generator 2. In addition, an operational amplifier and an analog-to-digital converter may also be provided between the waveform generator 2 and the excitation electrode 3.

[0046] In order to solve the problem that the existing human body impedance measurement equipment has a single transmission mode and does not support wireless and network transmission functions, in the utility model, the controller 1 is electrically connected or signal-connected to at least two data transmission modules. Figure 1 As shown, the data transmission module includes but is not limited to an interface module 10, a USB communication module 11, a wired communication module 12 and a wireless communication module 13. In particular, since the controller 1 of the utility model adopts an STM32MP135 single-chip microcomputer, compared with the existing STM32F103 main control chip, the controller 1 has a serial port, a USB interface and an Ethernet interface, and is connected to the wireless communication module 13 signal.

[0047] According to a preferred embodiment, for the wireless communication module 13 (such as a WIFI module), after the measurement is completed, the controller 1 obtains the impedance value of each segment of the human body through calculation, and the measured value can be directly transmitted to the device terminal. A corresponding display program is set at the device terminal, and the measured data can be transmitted to the user terminal through the wireless communication module 13 and displayed. As an example, the wireless communication module 13 described in the utility model can adopt an RTL8821CU-CG wireless transceiver module or a USB to WIFI module. Compared with the existing WM-G-MR-09WIFI module, the RTL8821CU-CG module has a wireless WiFi dual-band module, and has higher compatibility, speed, and stable and reliable networking performance.

[0048] In addition, after the measurement is completed, you can also choose to use the interface module 10 (such as the I / O expansion port and serial port electrically connected to the main control chip), the USB communication module 11 (that is, the USB interface), and the wired communication module 12 (such as the Ethernet interface) to transmit the data to the device terminal and customize the data transmission method according to different user needs.

[0049] In some optional embodiments, the bioimpedance measurement device provided by the utility model may further include an audio module. The audio module can facilitate the subject to perform corresponding actions according to the voice prompt information during the measurement process, and to know the test progress. The audio module may include a voice chip electrically connected to the main control chip, such as a KT603C voice chip.

[0050] According to a preferred embodiment, Figure 1 As shown, the bioimpedance measurement device provided by the present invention further includes a power module 14 for supplying power to the circuit. The power module 14 may be a rechargeable power source.

[0051] In some optional embodiments, the bioimpedance measurement device may further include a memory (such as a non-volatile memory and a volatile memory) for storing a plurality of device parameters and various input or output data generated during the bioimpedance measurement process.

[0052] In some optional embodiments, the bioimpedance measurement device may further include a display unit for displaying measurement information. As an example, the display unit may be any one of an LCD display screen and an LED display screen.

[0053] Preferably, Figure 4 For example, when the bioimpedance measuring device is a human scale, the bioimpedance measuring device may include a counterweight disposed inside and / or at the bottom of the device base. Specifically, for a human scale type impedance measuring device, electrodes (such as measuring electrodes 4) are generally disposed on the surface of the base, and the base may be partially or entirely formed of an insulating material to prevent an electrical connection loop from being formed between the electrode and the base. One or more counterweights may be disposed inside the base. For example, the counterweight may be removably mounted inside the base housing or the counterweight may be integrally formed with the base. As an example, the counterweight may be formed of an insulating material, such as engineering plastics, concrete, rubber, or a mixed pressed part. In particular, by providing a counterweight, the overall size (such as thickness) of the device base may be reduced, while stabilizing the center of gravity of the device to enhance the stable contact between the human test site and the electrode, thereby improving the accuracy of the impedance measurement result.

[0054] According to a preferred embodiment, Figure 4 As shown, when the bioimpedance measuring device is a human body scale, the bioimpedance measuring device may further include a support frame connected to the base, and a pair of handles detachably arranged on the support frame. At least one set of electrode pairs may be arranged on the handles. When a person stands on the base and holds the handles with both hands, the impedance of the upper body and the lower body of the human body can be measured. Specifically, the impedance of the lower body of the human body can be measured by at least one pair of first electrode pairs arranged on the base, and the impedance of the upper body of the human body can be measured by at least one pair of second electrode pairs arranged on the handles.

[0055] Figure 5 A specific example of a bioimpedance measurement device in contact with a human body is shown. As an example, Figure 5 The bioimpedance measuring device shown can be a wearable smart clothing. Specifically, for a wearable bioimpedance measuring device, the bioimpedance measuring device may include a wearable body and a measurement module embedded in the wearable body, and the measurement module may include a main control chip, a plurality of electrodes in contact with the skin or tissue of the human body (such as an excitation electrode 3, a measurement electrode 4), and a current generator (such as a waveform generator 2 and a voltage-current converter). Specifically, the main control chip sets the frequency for running the waveform generator 2, and outputs a control signal for indicating the frequency. The waveform generator 2 generates a waveform (such as a sine waveform) with a corresponding frequency in response to the received control signal, and outputs the waveform to the voltage-current converter. The voltage-current converter converts the waveform from a voltage signal to a current signal, and outputs the current signal (i.e., the excitation current) to the excitation electrode 3. The excitation current is supplied to the human body between the excitation electrodes 3.

[0056] According to a preferred embodiment, the bioimpedance measuring device may further include a timer (not shown in the figure). The waveform generator 2 may send a synchronization signal to the timer. The timer sends a trigger signal to the excitation electrode 3 in response to the received synchronization signal. The measuring electrode 4 synchronously samples the detected voltage based on the trigger signal.

[0057] It is understandable that the human body impedance will not only change with the frequency and amplitude of the excitation signal used in the measurement, but will also be affected by external factors of the human body, such as changes in the human body surface temperature and surface humidity. Preferably, the bioimpedance measurement device provided by the utility model may also include a humidity detection module and a temperature detection module arranged on the surface of the bioimpedance detection device in contact with the human body.

[0058] According to a preferred embodiment, Figure 3 As shown, the humidity detection module may include a first humidity detection unit 19 in contact with the left hand of the subject, a second humidity detection unit 15 in contact with the right hand of the subject, a third humidity detection unit 21 in contact with the left foot of the subject, and a fourth humidity detection unit 17 in contact with the right foot of the subject. Figure 3 As shown, the temperature detection module may include a first temperature detection unit 20 in contact with the subject's left hand, a second temperature detection unit 16 in contact with the subject's right hand, a third temperature detection unit 22 in contact with the subject's left foot, and a fourth temperature detection unit 18 in contact with the subject's right foot.

[0059] Specifically, during the impedance measurement process, the humidity detection module and the temperature detection module are started before the impedance measurement and are respectively connected to the display module (not shown) to display the measurement results. Preferably, when the data detected by the first, second, third, and fourth humidity detection units are all within the preset humidity threshold range, and the difference between the four humidity detection values ​​is less than the preset humidity difference, the impedance measurement is performed; and / or, when the data detected by the first, second, third, and fourth temperature detection units are all within the preset temperature threshold range, and the difference between the four temperature detection values ​​is less than the preset temperature difference, the impedance measurement is performed. In this way, the interference caused by the changes in the body surface temperature and body surface humidity of the human body to the impedance measurement can be reduced, making the impedance measurement more accurate. The method can be implemented by the measurer according to the temperature and humidity measurement results, or the relevant program can be compiled into the controller 1, and the impedance measurement program is started again when the temperature and humidity detection results meet the preset standards. This implementation method involving program improvement is not the technical solution claimed by this application. The utility model is intended to protect a bioimpedance measurement device with the above-mentioned hardware settings, and the technical solution does not involve program improvements.

[0060] It should be noted that the above-mentioned specific embodiments are exemplary, and those skilled in the art can come up with various solutions inspired by the disclosure of the utility model, and these solutions also belong to the disclosure scope of the utility model and fall within the protection scope of the utility model. Those skilled in the art should understand that the utility model specification and its drawings are illustrative and do not constitute a limitation on the claims. The scope of protection of the utility model is defined by the claims and their equivalents. The utility model specification contains multiple inventive concepts, such as "preferably", "according to a preferred embodiment" or "optionally", all of which indicate that the corresponding paragraph discloses an independent concept, and the applicant reserves the right to file a divisional application based on each inventive concept.

Claims

1. A bioimpedance measurement device, comprising a device housing and an impedance measurement circuit disposed in the device housing, characterized in that: The impedance measurement circuit comprises: Controller (1); A plurality of groups of electrode pairs, the electrode pairs comprising at least one excitation electrode (3) and at least one measuring electrode (4), wherein the excitation electrode (3) is connected to the controller (1) via an excitation output circuit, and the measuring electrode (4) is connected to the controller (1) via an impedance acquisition circuit; a multi-way switch (5), one end of which is connected to the controller (1) and the other end of which is connected to the electrode pair, so as to selectively switch the impedance measurement channel in response to an instruction of the controller (1); At least two data transmission modules, electrically connected to the controller (1); The excitation output circuit comprises a waveform generator (2) for outputting a waveform having a set frequency, one end of the waveform generator (2) is connected to the controller (1), and the other end of the waveform generator (2) is connected to the excitation electrode (3); The bioimpedance measuring device further comprises a timer and a humidity detection module and a temperature detection module arranged on a surface of the bioimpedance measuring device in contact with a human body, the waveform generator (2) sends a synchronization signal to the timer, the timer sends a trigger signal to the excitation electrode (3) in response to the received synchronization signal, and the measuring electrode (4) synchronously samples the detected voltage based on the trigger signal; The humidity detection module comprises a first humidity detection unit (19) in contact with the left hand of the subject, a second humidity detection unit (15) in contact with the right hand of the subject, a third humidity detection unit (21) in contact with the left foot of the subject, and a fourth humidity detection unit (17) in contact with the right foot of the subject, and the temperature detection module comprises a first temperature detection unit (20) in contact with the left hand of the subject, a second temperature detection unit (16) in contact with the right hand of the subject, a third temperature detection unit (22) in contact with the left foot of the subject, and a fourth temperature detection unit (18) in contact with the right foot of the subject.

2. The bioimpedance measurement device according to claim 1, characterized in that: The excitation output circuit further comprises a voltage-current converter, one end of which is connected to the waveform generator (2), and the other end of which is connected to the excitation electrode (3).

3. The bioimpedance measurement device according to claim 1, characterized in that: The data transmission module comprises at least two of an interface module (10), a USB communication module (11), a wired communication module (12) and a wireless communication module (13).

4. The bioimpedance measurement device according to claim 1, characterized in that: The device also includes a signal processing circuit, which includes an amplifier circuit (7) connected to the output end of the measuring electrode (4), a filter circuit (8) connected to the output end of the amplifier circuit (7), and a digital-to-analog conversion circuit (9) connected between the filter circuit (8) and the controller (1).

5. The bioimpedance measurement device according to claim 1, characterized in that: It also includes a reference resistor (6) connected in series to the excitation output circuit.

6. The bioimpedance measurement device according to claim 1, characterized in that: Also included is a power module (14) electrically connected to the controller (1).

7. The bioimpedance measurement device according to claim 1, characterized in that: Also included is an audio module electrically connected to the controller (1).

8. The bioimpedance measurement device according to claim 1, characterized in that: The bioimpedance measuring device is any one of a human body scale, a smart terminal and a wearable device.

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