CN107582055B - Biological impedance simulator - Google Patents
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- CN107582055B CN107582055B CN201710883803.XA CN201710883803A CN107582055B CN 107582055 B CN107582055 B CN 107582055B CN 201710883803 A CN201710883803 A CN 201710883803A CN 107582055 B CN107582055 B CN 107582055B
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- 238000012360 testing method Methods 0.000 claims abstract description 55
- 238000004088 simulation Methods 0.000 claims abstract description 49
- 238000005259 measurement Methods 0.000 claims abstract description 29
- 238000012545 processing Methods 0.000 claims description 35
- 239000003990 capacitor Substances 0.000 claims description 17
- 210000000577 adipose tissue Anatomy 0.000 description 14
- 238000000034 method Methods 0.000 description 13
- 230000008859 change Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000011871 bio-impedance analysis Methods 0.000 description 2
- 238000002847 impedance measurement Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
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- 230000000750 progressive effect Effects 0.000 description 1
Abstract
The invention discloses a bioimpedance simulator, which comprises at least one pair of measuring terminals; each pair of measurement terminals comprises a first measurement terminal and a second measurement terminal; the contact impedance simulation device is used for simulating contact impedance and comprises a positive electrode sub-device and a negative electrode sub-device; the first ends of the positive electrode sub-devices are respectively connected with the first measuring terminals; the first ends of the negative electrode sub-devices are respectively connected with the second measuring terminals; the positive electrode sub-device and the negative electrode sub-device respectively comprise a plurality of variable resistors, and each variable resistor is respectively arranged in one-to-one correspondence with each measuring terminal; the bioimpedance simulation device is used for simulating bioimpedance, and two ends of the bioimpedance simulation device are respectively connected with the second end of the positive electrode sub-device and the second end of the negative electrode sub-device. The invention provides a simulator for fully simulating a biological impedance model by considering contact impedance in a real environment, and is a more accurate test and calibration tool.
Description
Technical Field
The invention relates to the field of bioimpedance analysis, in particular to a bioimpedance simulator.
Background
Bioimpedance is an important part of biological signs, and in particular bioimpedance analysis has become an important focus of health. Currently, the impedance analysis is commonly used in four-wire system and two-wire system, and products such as body fat scales, body fat watches and the like based on the two methods also appear successively. In order to ensure the measurement accuracy of products such as body fat scales, body fat watches and the like, impedance simulation equipment is required to simulate the biological impedance, then the biological impedance of the impedance simulation equipment is measured by equipment to be measured such as the body fat scales, the body fat watches and the like, and then the measured value is compared with an actual simulation value to determine whether the equipment to be measured is accurate.
However, since the existing impedance simulation apparatus does not consider the contact impedance and its variation in the real measurement environment and fails to sufficiently simulate the human body impedance model, the accuracy of the above-mentioned products has been questioned.
Therefore, how to provide a bio-impedance simulator for the above test calibration device with higher accuracy is a problem that the skilled person needs to solve at present.
Disclosure of Invention
The invention aims to provide a biological impedance simulator which can more accurately simulate a contact impedance model and a human body impedance model in a real measurement environment.
In order to solve the above problems, the present invention provides a bioimpedance simulator, comprising:
at least one pair of measurement terminals; each pair of the measuring terminals comprises a first measuring terminal and a second measuring terminal;
the contact impedance simulation device is used for simulating contact impedance and comprises a positive electrode sub-device and a negative electrode sub-device; the first ends of the positive electrode sub-devices are respectively connected with the first measuring terminals; the first ends of the negative electrode sub-devices are respectively connected with the second measurement terminals; the positive electrode sub-device and the negative electrode sub-device respectively comprise a plurality of variable resistors, and each variable resistor is respectively arranged in one-to-one correspondence with each measuring terminal;
and the two ends of the biological impedance simulation device are respectively connected with the second end of the positive electrode sub-device and the second end of the negative electrode sub-device.
Preferably, the bioimpedance simulation device comprises an RC network.
Preferably, the variable resistor is a programmable resistor.
Preferably, the contact impedance simulation device further comprises a plurality of filter capacitors, and each filter capacitor is connected in series with each program-controlled resistor in a one-to-one correspondence manner.
Preferably, the contact impedance simulation device further comprises a plurality of switches which are respectively connected with each filter capacitor in parallel in a one-to-one correspondence manner, and the switches are used for controlling whether the filter capacitor corresponding to the switch is connected into a circuit or not.
Preferably, each switch is any one of a triode, a MOS tube and a single-pole double-throw switch.
Preferably, the method further comprises:
the data input device is used for inputting test parameters by a user and receiving the test parameters;
and the data processing device is respectively connected with the contact impedance simulation device, the biological impedance simulation device and the data input device and is used for acquiring the test parameters from the data input device and adjusting the contact impedance of the contact impedance simulation device and the biological impedance of the biological impedance simulation device according to the test parameters.
Preferably, the method further comprises:
and the impedance measuring device is connected with the biological impedance simulating device in parallel, and the output end of the impedance measuring device is connected with the data processing device, and is used for measuring the biological impedance of the biological impedance simulating device and sending the measurement result to the data processing device, so that the data processing device can calibrate the biological impedance of the biological impedance simulating device according to the measurement result and compare the measurement result with the measured value of the equipment to be measured as a standard value.
Preferably, the method further comprises:
and the current measuring device is connected with the biological impedance simulation device in series, and the output end of the current measuring device is connected with the data processing device and is used for measuring the current in the biological impedance simulation device and sending the measurement result to the data processing device so that the data processing device can judge whether the current is safe to organisms or not and display the judgment result.
Preferably, the method further comprises:
and the output display device is connected with the data processing device and used for displaying the test result.
The invention provides a biological impedance simulator which comprises a measuring terminal, a contact impedance simulator and a biological impedance simulator which are connected in series. The biological impedance simulator provided by the invention takes the contact impedance and the change of the contact impedance in the real measurement environment into consideration, the contact impedance is simulated by the contact impedance simulator, and the biological impedance is simulated by the biological impedance simulator, so that the contact impedance and the biological impedance in the real environment are simulated more accurately. Therefore, the device to be tested can be tested by using the bioimpedance simulator of the invention to obtain more accurate test results.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required in the prior art and the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a human body impedance simulator according to the present invention;
FIG. 2 is a schematic diagram of a specific embodiment of a simulator according to the present invention;
fig. 3 is a circuit diagram of an analog instrument according to an embodiment of the present invention.
Detailed Description
The invention aims at providing a biological impedance simulator which can simulate the contact impedance and the human body impedance model in a real measurement environment more accurately so that the test calibration equipment using the biological impedance simulator provides more accurate test results.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a bio-impedance simulator according to the present invention. The bioimpedance simulator provided by the invention comprises:
at least one pair of measuring terminals 1, each pair of measuring terminals 1 comprising a first measuring terminal and a second measuring terminal; the first measuring terminal and the second measuring terminal are respectively used for connecting the anode and the cathode of the equipment to be measured;
a contact impedance simulation device 2 for simulating contact impedance, comprising a positive sub-device and a negative sub-device; the first ends of the positive electrode sub-devices are respectively connected with the first measuring terminals; the first ends of the negative electrode sub-devices are respectively connected with the second measurement terminals; the positive electrode sub-device and the negative electrode sub-device respectively comprise a plurality of variable resistors, and each variable resistor is respectively arranged in one-to-one correspondence with each measuring terminal;
and the bioimpedance simulation device 3 is used for simulating bioimpedance, and two ends of the bioimpedance simulation device 3 are respectively connected with the second end of the positive electrode sub-device and the second end of the negative electrode sub-device.
The device to be tested refers to a body fat measurement device to be tested, such as a body fat scale, a body fat watch and other products. The biological impedance simulator is used for simulating the impedance of a human body, the device to be tested is connected with the biological impedance simulator through the measuring terminal 1, the impedance value of the biological impedance simulator is measured, and then the measured value is compared with the simulation value of the biological impedance simulator to determine whether the device to be tested is accurate or not.
In a preferred embodiment, the bio-impedance simulator further comprises:
a data input device 4 for a user to input test parameters and receive test data;
and the data processing device 5 is respectively connected with the contact impedance simulation device 2, the biological impedance simulation device 3 and the data input device 4 and is used for acquiring the test parameters from the data input device 4 and controlling the contact impedance of the contact impedance simulation device 2 and the biological impedance of the biological impedance simulation device 3 according to the test parameters.
Further, it can be known that, in the process of detecting the device to be detected, the process of comparing the measured value of the device to be detected with the analog value of the bio-impedance simulator may be performed manually, or the device to be detected may be connected with the data processing device 5, the device to be detected sends its measured value to the data processing device 5, and the data processing device 5 compares the bio-impedance measured by the device to be detected with the bio-impedance simulated by the bio-impedance simulator, so as to obtain the test result of the device to be detected. The mode in which the present invention is specifically adopted is not particularly limited.
It should be noted that, the above test result may be obtained by making a ratio or a difference between the bioimpedance measured by the device to be tested and the bioimpedance of the bioimpedance simulator, so long as an error between the bioimpedance measured by the device to be tested and the bioimpedance is obtained, so that the data processing apparatus 5 may obtain the test result of the device to be tested according to the error, and how to obtain the error specifically does not affect the implementation of the present invention. The test result can be set as qualified, unqualified or first grade, second grade and the like according to the needs of users. The specific test result set does not affect the implementation of the present invention.
Since the existing body fat wristband, body fat watch and body fat balance waiting and measuring equipment is generally designed based on a two-wire system method or a four-wire system method, and the terminals to be measured of the equipment are usually arranged in pairs, the measuring terminals 1 provided by the invention are also arranged in pairs.
When the bioimpedance simulator provided by the invention is used for testing the test calibration equipment of related equipment such as body fat balance, the measuring terminal 1 is connected with the equipment to be tested, test parameters such as test signal frequency, target bioimpedance value, target contact impedance value and the like are input into the data input device 4, the data processing device 5 adjusts the impedance values of the bioimpedance simulation device 3 and the contact impedance simulation device 2 according to the parameters, and the bioimpedance simulator uses the bioimpedance of the bioimpedance simulation device 3 as a standard for testing the equipment to be tested.
In an embodiment of the present invention, referring to fig. 2, the bio-impedance simulator further includes:
and the impedance measuring device 6 is connected with the biological impedance simulating device 3 in parallel, and the output end of the impedance measuring device is connected with the data processing device 5, and is used for measuring the biological impedance of the biological impedance simulating device 3 and sending the measurement result to the data processing device 5 so that the data processing device 5 can adjust the biological impedance of the biological impedance simulating device 3 according to the measurement result and the test parameter.
In the above embodiment, the specific type of impedance measuring device may be an LCR meter as shown in fig. 3, or may be other impedance measuring devices, and the specific type of device does not affect the implementation of the present invention.
It can be appreciated that in this embodiment, the measured value of the bio-impedance may be measured by the impedance measurement device, the error between the bio-impedance of the bio-impedance simulation device and the target bio-impedance value may be known, and the bio-impedance of the bio-impedance simulation device may be further adjusted to be closer to the target bio-impedance value, so that the test result may be more accurate.
In one embodiment of the present invention, the bio-impedance simulation apparatus 3 may employ an RC network as shown in fig. 3, and the data processing apparatus 5 controls the resistance and capacitance of the RC network according to the measurement result and the test parameter of the impedance measurement apparatus 6, for example, when the test result of the bio-impedance simulation apparatus 3 is less than the ideal value, the resistance and capacitance of the RC network are controlled to increase. In this implementation method, the data processing device 5 adjusts the resistance value and the capacitance value of the RC network, so that the total impedance of the bio-impedance simulation device is the target bio-impedance value in the test parameters. Of course, in other embodiments, other circuits may be used for the bioimpedance simulation device 3, and the particular circuit design does not affect the implementation of the present invention.
In addition, the resistor in the RC network is a program-controlled resistor, and the capacitor is a program-controlled capacitor.
Referring to fig. 3, fig. 3 is a circuit diagram showing a main structure in a specific embodiment of the present invention, in this embodiment, each of the positive electrode sub-device and the negative electrode sub-device includes a plurality of program-controlled resistors 21, and each of the program-controlled resistors 21 is disposed in a one-to-one correspondence with each of the measurement terminals 1. The resistance change mode of the measuring terminal 1 and the programmable resistor 21 is controlled by the data processing module 5. At this time, the parameters of the target contact impedance include the resistance value and the resistance change pattern of the programmable resistor 21.
The resistance change pattern includes the following:
the programmable resistor 21 maintains a certain constant resistance value;
the resistance of the programmable resistor 21 is gradually increased or decreased in a certain range at a certain speed increasing rate;
the resistance of programmable resistor 21 increases or decreases beyond a particular range (i.e., a surge or snapback condition) for a particular period of time;
the resistances of the respective programmable resistors 21 based on the above-described change patterns may be the same or different.
It can be understood that the impedance change mode affects the contact impedance value simulated by the contact impedance simulation device, and any one of the change modes can be selected to adjust the value of the contact impedance according to actual needs. Of course, in addition to the above change modes, the user may also autonomously define a change mode of the resistance value of the programmable resistor 21.
In this particular implementation, a test calibration device using the bio-impedance simulator may test a device based on a two-wire method. In the circuit diagram shown in fig. 3, when testing the two-wire system device, one terminal is selected from the test terminals 1a and 1b, one terminal is selected from the test terminals 1c and 1d, and the two selected test terminals form a pair of test terminals, which are respectively connected to the two terminals of the two-wire system device to be tested, and the subsequent test process is the same as the test process of the above embodiment, and will not be repeated here.
Based on the above simulator, referring to fig. 3, the contact impedance simulator 2 further includes a plurality of filter capacitors 22, where each filter capacitor 22 is connected in series with each program-controlled resistor 21 in a one-to-one correspondence manner.
The filter capacitor 22 is used to filter the dc component of the test current, and the bioimpedance simulator can be used to test devices based on the four-wire system. At this time, the four test terminals are connected to the corresponding terminals of the device to be tested, respectively.
In another preferred embodiment based on the above-mentioned simulator, the contact impedance simulation device 2 further comprises a switch 23 connected in parallel with each filter capacitor 22 in a one-to-one correspondence, respectively. The switch 23 is used to control whether the filter capacitor 22 corresponding to the switch is connected to the circuit.
Referring specifically to fig. 3, a circuit diagram is shown.
It will be appreciated that if switch 23 is closed, filter capacitor 22 is shorted, and a two-wire based device can be tested; if the switch 23 is opened, the filter capacitor 22 will filter out the dc component in the test current, and the four-wire system based device can be tested. The simulator in the present embodiment can test the above two types of devices by switching the state of the switch 23.
In the specific implementation of the simulator, each switch 23 is any one of a triode, a MOS transistor and a single-pole double-throw switch. Of course, other types of switches are possible, and the particular type of switch does not affect the implementation of embodiments of the present invention. Also, different switches 23 in the bioimpedance simulator of the invention may be of different types.
In another specific implementation of the invention, the measurement terminal 1 further comprises a conductive glue.
It can be understood that if the device to be tested uses the special-shaped measuring terminal, the conductive adhesive is additionally arranged on the measuring terminal 1, so that the cross section can be fully contacted, and the device to be tested can be conveniently tested.
In an embodiment of the present invention, referring to the schematic structural diagram shown in fig. 2, the bio-impedance simulator may further include:
and a current measuring device 7 connected in series with the bio-impedance simulation device 3 and having an output terminal connected to the data processing device 5, for measuring the current in the bio-impedance simulation device 3 and transmitting the measurement result to the data processing device 5 so that the data processing device 5 judges whether the current is safe to the living body and displays the judgment result.
Referring to fig. 3, the current measuring device 7 is an ammeter a. Of course, the kind of current measuring means 7 does not affect the implementation of the invention, other types of current measuring means 7 may be used.
It is easy to understand that the living body can bear limited current, and if the current is too large when the product such as the body fat scale is used, the product can be hurt to people using the product. The relevant safety standard (IEC-60601 standard) prescribes the safety range of the current flowing to the human body, after the current measuring device 7 uploads the current value to the data processing module, the data processing device 5 determines whether the current value is safe or not according to the corresponding algorithm, and carries out corresponding processing according to the judgment result, such as output display or alarm. By means of the above-mentioned current measuring device 7, the safety of the product can be improved.
In one embodiment, referring to the schematic structural diagram shown in fig. 2, the bioimpedance simulator of the present invention further comprises:
and an output display device 8 for displaying the test results, wherein the test results comprise the test parameter current value, the judgment result and the test parameter.
It can be understood that, through the output display device 8, various parameters of the simulator can be intuitively displayed, and the current passing through the bioimpedance simulation device 3 during the test and whether the current is safe for the user of the device to be tested, the test result of the device to be tested, and the like. So that the interactivity of the simulator is improved.
The invention provides a biological impedance simulator which comprises a measuring terminal, a contact impedance simulator and a biological impedance simulator which are connected in series. The biological impedance simulator provided by the invention takes the contact impedance and the change of the contact impedance in the real measurement environment into consideration, the contact impedance is simulated by the contact impedance simulator, and the biological impedance is simulated by the biological impedance simulator, so that the contact impedance and the biological impedance in the real environment are simulated more accurately. Therefore, the device to be tested can be tested by using the bioimpedance simulator of the invention to obtain more accurate test results.
The above embodiments are only preferred embodiments of the present invention, and the above embodiments may be arbitrarily combined, and the combined embodiments are also within the scope of the present invention. It should be noted that modifications can be made by those skilled in the art without departing from the principles of the present invention, which modifications are also to be considered as being within the scope of the present invention.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
It should also be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A bioimpedance simulator, comprising:
at least one pair of measurement terminals; each pair of the measuring terminals comprises a first measuring terminal and a second measuring terminal;
the contact impedance simulation device is used for simulating contact impedance and comprises a positive electrode sub-device and a negative electrode sub-device; the first ends of the positive electrode sub-devices are respectively connected with the first measuring terminals; the first ends of the negative electrode sub-devices are respectively connected with the second measurement terminals; the positive electrode sub-device and the negative electrode sub-device respectively comprise a plurality of variable resistors, and each variable resistor is respectively arranged in one-to-one correspondence with each measuring terminal;
and the two ends of the biological impedance simulation device are respectively connected with the second end of the positive electrode sub-device and the second end of the negative electrode sub-device.
2. The simulator of claim 1, wherein the bioimpedance simulation device comprises an RC network.
3. The simulator of claim 1, wherein the variable resistor is a programmable resistor.
4. A simulator according to claim 3, wherein the contact impedance simulator further comprises a plurality of filter capacitors, each filter capacitor being connected in series with each programmable resistor in a one-to-one correspondence.
5. The simulator of claim 4, wherein the contact impedance simulator further comprises a plurality of switches connected in parallel with each of the filter capacitors in a one-to-one correspondence, the switches being used for controlling whether the filter capacitor corresponding to the switch is connected to a circuit.
6. The simulator of claim 5, wherein each of the switches is any one of a triode, a MOS transistor, and a single pole double throw switch.
7. The simulator of any of claims 1-6, further comprising:
the data input device is used for inputting test parameters by a user and receiving the test parameters;
and the data processing device is respectively connected with the contact impedance simulation device, the biological impedance simulation device and the data input device and is used for acquiring the test parameters from the data input device and adjusting the contact impedance of the contact impedance simulation device and the biological impedance of the biological impedance simulation device according to the test parameters.
8. The simulator of claim 7, further comprising:
and the impedance measuring device is connected with the biological impedance simulating device in parallel, and the output end of the impedance measuring device is connected with the data processing device, and is used for measuring the biological impedance of the biological impedance simulating device and sending the measurement result to the data processing device, so that the data processing device can calibrate the biological impedance of the biological impedance simulating device according to the measurement result and compare the measurement result with the measured value of the equipment to be measured as a standard value.
9. The simulator of claim 7, further comprising:
and the current measuring device is connected with the biological impedance simulation device in series, and the output end of the current measuring device is connected with the data processing device and is used for measuring the current in the biological impedance simulation device and sending the measurement result to the data processing device so that the data processing device can judge whether the current is safe to organisms or not and display the judgment result.
10. The simulator of claim 7, further comprising:
and the output display device is connected with the data processing device and used for displaying the test result output by the data processing device.
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| CN103070683A (en) * | 2012-12-20 | 2013-05-01 | 中山大学 | Sleep breathing mode identification method and device based on bioelectrical impedance |
| WO2014035040A1 (en) * | 2012-08-31 | 2014-03-06 | 부산대학교 산학협력단 | Multi-channel impedance measuring method and multi-channel impedance measuring instrument |
| CN106137192A (en) * | 2016-07-27 | 2016-11-23 | 北京四海华辰科技有限公司 | A kind of body impedance measurement devices and bioelectrical impedance analysis instrument thereof |
| CN107024515A (en) * | 2017-05-23 | 2017-08-08 | 北京康智乐思网络科技有限公司 | A kind of saliva impedance detection device and equipment |
| CN208598395U (en) * | 2017-09-26 | 2019-03-15 | 歌尔科技有限公司 | A kind of bio-impedance analog meter |
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| CN1907220A (en) * | 2006-08-16 | 2007-02-07 | 中山市创源电子有限公司 | Human body impedance measuring apparatus and fat meter using same |
| WO2014035040A1 (en) * | 2012-08-31 | 2014-03-06 | 부산대학교 산학협력단 | Multi-channel impedance measuring method and multi-channel impedance measuring instrument |
| CN103070683A (en) * | 2012-12-20 | 2013-05-01 | 中山大学 | Sleep breathing mode identification method and device based on bioelectrical impedance |
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