CN117617938A - Contact impedance measuring circuit, method, detecting device, chip and electronic equipment - Google Patents
Contact impedance measuring circuit, method, detecting device, chip and electronic equipment Download PDFInfo
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- CN117617938A CN117617938A CN202210961047.9A CN202210961047A CN117617938A CN 117617938 A CN117617938 A CN 117617938A CN 202210961047 A CN202210961047 A CN 202210961047A CN 117617938 A CN117617938 A CN 117617938A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000005284 excitation Effects 0.000 claims abstract description 142
- 238000005259 measurement Methods 0.000 claims abstract description 82
- 238000002847 impedance measurement Methods 0.000 claims abstract description 60
- 238000001514 detection method Methods 0.000 claims description 9
- 238000012360 testing method Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 17
- 210000000577 adipose tissue Anatomy 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 210000001519 tissue Anatomy 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 230000001575 pathological effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000036620 skin dryness Effects 0.000 description 1
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/053—Measuring electrical impedance or conductance of a portion of the body
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/053—Measuring electrical impedance or conductance of a portion of the body
- A61B5/0531—Measuring skin impedance
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/053—Measuring electrical impedance or conductance of a portion of the body
- A61B5/0537—Measuring body composition by impedance, e.g. tissue hydration or fat content
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/25—Bioelectric electrodes therefor
Abstract
The application provides a contact impedance measuring circuit, a method, a detecting device, a chip and electronic equipment. The contact impedance measurement circuit comprises an excitation module and a measurement module; the excitation module is used for being connected with at least two electrode units respectively and outputting excitation current through the at least two electrode units; wherein the electrode unit comprises two electrodes; a measurement module for: when the electrode to be measured is connected with the excitation module, the electrode to be measured is respectively connected with the electrode to be measured and the first associated electrode; acquiring a first voltage signal between an electrode to be detected and a first associated electrode; the first correlation electrode is another electrode except the electrode to be detected in the electrode unit comprising the electrode to be detected; and acquiring the contact impedance of at least one electrode to be tested according to the excitation current and the first voltage signal. The contact impedance measuring circuit provided by the application realizes the measurement of contact impedance and improves the accuracy of contact impedance measurement.
Description
Technical Field
The present disclosure relates to the field of biological impedance measurement technologies, and in particular, to a contact impedance measurement circuit, a contact impedance measurement method, a detection device, a chip, and an electronic device.
Background
Organism impedance has many applications in the healthcare field and in the consumer application field, impedance measurement being extremely useful for vital sign monitoring, sensing of tissue and fluid levels in the organism. In the measurement of the impedance of the organism, the contact impedance between the electrode and the organism has great influence on the accuracy and repeatability of the impedance measurement; the contact impedance due to insufficient contact between the electrode and the living body or skin dryness or the like may cause a large error in impedance measurement results and even failure of impedance measurement, and thus measurement of the contact impedance is very necessary to ensure living body impedance measurement performance.
Disclosure of Invention
The invention aims to provide a contact impedance measuring circuit, a method, a detection device, a chip and electronic equipment, so as to solve the technical problem of larger measurement error of contact impedance in the prior art.
The technical scheme of the application is as follows, a contact impedance measuring circuit is provided, and the contact impedance measuring circuit comprises an excitation module and a measuring module;
the excitation module is used for being respectively connected with at least two electrode units and outputting excitation current through the at least two electrode units; wherein the electrode unit comprises two electrodes;
the measuring module is used for:
when the electrode to be measured is connected with the excitation module, the electrode to be measured is respectively connected with the electrode to be measured and the first associated electrode;
acquiring a first voltage signal between the electrode to be detected and the first associated electrode; the electrode to be measured is any electrode in any electrode unit, and the first associated electrode is the other electrode except the electrode to be measured in the electrode unit comprising the electrode to be measured;
and acquiring the contact impedance of at least one electrode to be tested according to the excitation current and the first voltage signal.
Another technical solution of the present application is as follows, and provides a contact impedance measurement method, including:
outputting an excitation current through at least two electrode units; wherein the electrode unit comprises two electrodes;
acquiring a first voltage signal between an electrode to be detected and a first associated electrode; the electrode to be measured is any electrode in any electrode unit, and the first associated electrode is the other electrode except the electrode to be measured in the electrode unit comprising the electrode to be measured;
and acquiring the contact impedance of the electrode to be tested according to the excitation current and the first voltage signal.
Another technical solution of the present application is as follows, providing a contact impedance detection device, including:
at least two electrode units including two electrodes;
and, a contact impedance measurement circuit as described in any one of the above aspects.
Another technical scheme of the application is as follows, and provides a chip, including the contact impedance measurement circuit according to any one of the above technical schemes.
Another technical scheme of the application is as follows, and provides an electronic device, which comprises the contact impedance measurement circuit according to any one of the above technical schemes, or the contact impedance measurement device according to any one of the above technical schemes, or the chip according to the above technical scheme.
The beneficial effects of this application lie in: the excitation module is respectively connected with different electrode units, excitation current is output through the connected electrode units, the measurement module is respectively connected with the electrode to be measured and the first associated electrode when the electrode to be measured is connected with the excitation module, and obtains a first voltage signal between the electrode to be measured and the first associated electrode, and at least one contact impedance of the electrode to be measured is obtained according to the excitation current and the first voltage signal, so that the measurement of the contact impedance is realized, the accuracy of the measurement of the contact impedance is improved, the accuracy of the measurement of the impedance of a living body is improved, and the influence of partial limb impedance in the living body on the measurement result of the contact group resistance in the measurement of the contact impedance is reduced due to different loops of the excitation current and loops of the measurement of the first voltage signal, and the accuracy of the measurement of the contact impedance is further improved, so that the measurement result of the impedance of the living body is more accurate.
Drawings
FIG. 1 is a schematic diagram of measuring the impedance of a living body according to an embodiment of the present application;
fig. 2 is a schematic diagram of a first structure of a contact impedance measurement circuit according to an embodiment of the present application;
fig. 3 is a second schematic structural diagram of a contact impedance measurement circuit according to an embodiment of the present application;
fig. 4 is a third schematic structural diagram of a contact impedance measurement circuit according to an embodiment of the present disclosure;
fig. 5 is a fourth schematic structural diagram of a contact impedance measurement circuit according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram of a fifth structure of a contact impedance measurement circuit according to an embodiment of the present disclosure;
fig. 7 is a schematic diagram of a sixth structure of a contact impedance measurement circuit according to an embodiment of the present disclosure;
fig. 8 is a seventh schematic structural diagram of a contact impedance measurement circuit according to an embodiment of the present disclosure;
fig. 9 is a schematic diagram of a first structure of a contact impedance measurement device according to an embodiment of the present application;
fig. 10 is a schematic diagram of a second structure of a contact impedance measurement device according to an embodiment of the present application;
fig. 11 is a schematic structural diagram of a chip according to an embodiment of the present application;
fig. 12 is a first schematic structural diagram of an electronic device according to an embodiment of the present application;
fig. 13 is a second schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
In the embodiment of the application, at least one refers to one or more; plural means two or more. In the description of the present application, the words "first," "second," "third," and the like are used solely for the purpose of distinguishing between descriptions and not necessarily for the purpose of indicating or implying a relative importance or order.
It should be noted that in the embodiments of the present application, "connected" is understood to mean electrically connected, and two electrical components may be connected directly or indirectly between two electrical components. For example, a may be directly connected to B, or indirectly connected to B via one or more other electrical components.
The bioimpedance measurement is a nondestructive detection technology for extracting biomedical information related to physiological and pathological conditions of human body by utilizing the electrical characteristics of biological tissues and organs and the change rule thereof. It generally applies an excitation electric signal to a living body by means of electrodes provided on an electronic device such as a body fat scale or a body composition analyzer, and measures impedance data of the living body based on a change generated by the excitation electric signal after passing through a conductive loop of the living body. At present, a four-electrode or eight-electrode measurement method is commonly adopted in the bioimpedance measurement, but in the bioimpedance measurement, contact impedance is generated due to the contact of an electrode with a living body, and the contact impedance can have great influence on the result of the bioimpedance measurement.
For example, referring to fig. 1, fig. 1 is a schematic diagram illustrating the measurement of the impedance of a living body by a four-electrode measurement method. As shown in fig. 1, zb is the living body impedance, and Ze1 to Ze4 are the contact impedances of the electrodes E1, E2, E3, E4 and the living body skin, respectively; wherein E1 and E2, E3 and E4 are two electrode pairs respectively, and the two electrode pairs are respectively contacted with different parts of the organism. E1 and E3 are respectively used as excitation electrodes to be connected with an excitation module Igen, and excitation current output by the excitation module Igen is transmitted to a living body through E1 and then passes through E3 to form a conductive loop. E2 and E4 are respectively measuring electrodes, the measuring module Vsensor respectively measures the voltages of the electrodes E2 and E4, so that the voltage Vzb of the two ends b0 and b1 of the organism impedance Zb is obtained, and then the value of the organism impedance Zb is obtained through calculation through the excitation currents of the voltage Vzb and Igen. However, as shown in fig. 1, measuring the impedance of the living body requires that the electrodes E1 to E4 are in contact with the living body to inject the current into the living body, and the contact interfaces of the electrodes E1, E2, E3, E4 and the living body have contact impedances, which are inevitably calculated therein when measuring the impedance of the living body, thereby affecting the accuracy of the measurement result of the impedance of the living body.
The contact impedance in the related art can be measured by a two-electrode method and a four-electrode method; however, in the measurement of the contact impedance by the four-electrode method, since the phase angles of the contact impedance itself and the impedance of the living body are different, the two are not simply added or subtracted, resulting in a large error between the measured value of the contact impedance obtained by the four-electrode method and the true value of the contact impedance; in addition, the difference of current paths between the excitation electrode and the measurement electrode in the four-electrode deduction method also enables the obtained contact impedance measurement value to actually comprise the impedance of a part of organisms; these all make the errors of existing contact impedance measurement schemes large.
To alleviate the above-mentioned problem, the present application provides a contact impedance measurement circuit 100, please refer to fig. 2. It should be noted that, if there are substantially the same results, the contact impedance measurement circuit of the present application is not limited to the block diagram shown in fig. 2. As shown in fig. 2, the contact impedance measuring circuit 100 includes an excitation module Igen11 and a measuring module Vsensor 12. The excitation module Igen11 is used for respectively connecting at least two electrode units 20 when the electrode to be detected is connected with the excitation module and outputting excitation current through the at least two electrode units 20; wherein the electrode unit 20 comprises two electrodes. The measurement module Vsensor12 is for: the first voltage signal between the electrode to be tested and the first associated electrode is obtained; the first correlation electrode is another electrode except the electrode to be detected in the electrode unit comprising the electrode to be detected; and obtaining the contact impedance of at least one electrode to be tested according to the excitation current and the first voltage signal.
In this embodiment, the excitation module Igen11 may be connected to the electrodes of different electrode units, for example, a first electrode unit and a second electrode unit, and the excitation module Igen11 may be connected to one of the electrodes of the first electrode unit and also connected to one of the electrodes of the second electrode unit, and output an excitation current to the electrode connected thereto, that is, the excitation current is transmitted in the different electrode units. The excitation module Igen11 is generally an ac constant current source, whose amplitude can be kept unchanged, and generates a sine wave current, i.e. an excitation current. The measuring module Vsensor12 may be connected to two electrodes in the same electrode unit, for example, one electrode in the first electrode unit is an electrode to be measured, and the measuring module Vsensor12 may be connected to the electrode to be measured and also connected to another electrode in the first electrode unit, that is, the first associated electrode, so that the measuring module Vsensor12 measures the object to be measured and the first associated electrode in the same electrode unit, and then obtains the first voltage signal between them, and then obtains the contact impedance of the electrode to be measured according to the excitation current and the first voltage signal. Of course, an electrode in other electrode units may be an electrode to be measured, and when the electrode to be measured is connected to the excitation module Igen11, the measurement module Vsensor12 may be connected to the electrode to be measured and another electrode in the electrode unit where the electrode to be measured is located, respectively. In this way, the contact impedance of at least one electrode to be measured can be obtained.
In this embodiment, the excitation module Igen11 is connected to different electrode units, and outputs excitation current through the connected electrode units, and the measurement module Vsensor12 is connected to the electrode to be measured and the first associated electrode when the electrode to be measured is connected to the excitation module Igen11, and obtains a first voltage signal between them, and obtains a contact impedance of at least one electrode to be measured according to the excitation current and the first voltage signal, thereby realizing measurement of the contact impedance, improving accuracy of measuring the impedance of the living body, and reducing influence of part of limb impedance in the living body on the measurement result of the contact group resistance when measuring the contact impedance due to different loops of the excitation current and loops of the first voltage signal, and further improving accuracy of measuring the contact impedance, so that the measurement result of the impedance of the living body is more accurate.
In some embodiments, the excitation module Igen11 is further configured to be connected to the electrode under test and the second associated electrode, respectively, and to output an excitation current through the electrode under test and the second associated electrode; the second associated electrode is any electrode in another electrode unit which does not comprise the electrode to be measured.
The excitation module Igen11 is configured to connect different electrode units, i.e. to the electrode to be measured and a second associated electrode not belonging to the same electrode unit as the electrode to be measured, respectively. For example, there are a first electrode unit and a second electrode unit, the first electrode unit has an electrode to be measured, and the second electrode unit has a second associated electrode, so that the excitation current output by the excitation simulation Igen11 is retransmitted to the second associated electrode through the electrode to be measured. Referring to fig. 7, if the first electrode unit includes electrodes E1 and E2 and the second electrode unit includes electrodes E3 and E4, the contact impedance of the electrode E1 is Ze1, and the electrode E1 is used as the impedance to be measured, the excitation electrode Igen11 may be connected to the electrodes E1 and E3, and the excitation current is looped from E1 to the organism impedance Zb to E3; the measuring module Vsensor12 may be connected to E1 and E2, respectively, and the first voltage signal measuring circuits thereof are E1 to E2, so that in this embodiment, the circuit of the excitation current is different from the first voltage signal measuring circuit when measuring the contact impedance of the electrode E1 to be measured, and of course, the excitation current may also be connected to E1 and E4, respectively. Therefore, through different excitation current loops and first voltage signal measuring loops, the influence of partial limb impedance in organisms on the contact group impedance measuring result during the measurement of the contact impedance can be reduced, and the accuracy of the contact impedance measurement is improved.
Wherein the distance between two electrodes of the same electrode unit may be smaller than the distance between two electrodes respectively located in different electrode units.
In some embodiments, the contact impedance measuring circuit 100 includes a switch module 13, please refer to fig. 3, the switch module 13 is used to control the connection state of the electrode and the measuring module Vsensor12 or the excitation module Igen 11. At least two electrode units 20 are respectively connected with the excitation module Igen11 and the measurement module Vsensor12 through the switch module 13, and the switch module 13 can control the connection or conduction of the electrodes in the electrode units 20 and the measurement module Vsensor12, and can also control the connection or conduction of the electrodes in the electrode units 20 and the excitation module Igen 11.
As an embodiment, the switch module 13 includes a first switch module 131, referring to fig. 4, the first switch module 131 is configured to control the electrode to be tested and the first associated electrode to be connected to the measuring module Vsensor12, so that the measuring module Vsensor12 obtains the contact impedance of at least one electrode to be tested according to the excitation current and the first voltage signal. The first switch module 131 is respectively connected to the measuring module Vsensor12 and the at least two electrode units 20, in order to measure the contact impedance of the electrode to be measured, the electrode to be measured and the first associated electrode may be respectively disconnected from the measuring module Vsensor12 by the first switch module 131, and other electrodes may be controlled to be disconnected from the measuring module Vsensor12 so as to avoid the other electrodes from affecting the measurement result, so that the measuring module Vsensor12 may obtain the first voltage signal between the electrode to be measured and the first associated electrode, and obtain the impedance of the electrode to be measured according to the first voltage signal and the excitation current.
As an embodiment, the switching module 13 further comprises a second switching module 132, the second switching module 132 being used for controlling the connection or disconnection of the electrodes to or from the excitation module Igen 11; so that the electrode to be measured and the second associated electrode are respectively connected to the excitation module Igen 11. The second switch module 132 is connected to the excitation module Igen11 and at least two electrode units 20, and in order to measure the contact impedance of the electrode to be measured, an excitation current is further required to be provided for the electrode to be measured, so that the electrode to be measured and the second associated electrode can be connected to the excitation module Igen11 through the second switch module 132, and further, other electrodes can be controlled to be disconnected from the excitation module Igen11 to avoid the influence of other electrodes on the measurement of the contact impedance.
The switch module 13 in this embodiment may be a multiplexer or a transistor, and the specific circuit implementation of the switch module 13 is not limited in this embodiment, so long as it can implement the above functions.
In the embodiment, the first switch module and the second switch module are arranged so as to be convenient for connecting or disconnecting the control electrode with the excitation module Igen11 and connecting or disconnecting the control electrode with the measurement module Vsensor12, so that the measurement of the contact impedance of any electrode can be flexibly realized.
In some embodiments, the contact impedance measuring circuit 100 may further include a control module (not shown) for controlling the first and second switching modules 131 and 132 to control the connection state of the electrodes in the at least two electrode units 20 with the excitation module Igen11 or the measuring module Vsensor 12.
According to the embodiment, the control module is arranged, so that the first switch module and the second switch module are controlled by the control module, and further automatic measurement of contact impedance can be realized.
In some embodiments, the two electrodes in the electrode unit are an excitation electrode and a measurement electrode, respectively; when the electrode to be measured and the second associated electrode are excitation electrodes, the first associated electrode is a measurement electrode, and the measurement module Vsensor12 is further configured to: the first associated electrode and the third associated electrode are respectively connected; wherein the third associated electrode is a measuring electrode corresponding to the second associated electrode; acquiring a second voltage signal between the first correlation electrode and the third correlation electrode; the impedance of the living being is obtained from the excitation current and the second voltage signal.
In this embodiment, in order to obtain the impedance of the living body, when the electrode to be measured and the second associated electrode are excitation electrodes, that is, the excitation electrodes in the different electrode units are both connected with the excitation module Igen11, the measurement electrodes in the different electrode units are both connected with the measurement module Vsensor12, that is, the first associated electrode and the third associated electrode are respectively connected with the measurement module Vsensor12, so that the excitation current can pass through the living body through the two excitation electrodes, and the measurement electrodes (the first associated electrode and the third associated electrode) corresponding to the excitation electrodes respectively can obtain the second voltage signal through the measurement module Vsensor12, and obtain the impedance of the living body according to the excitation current and the second voltage signal.
As an embodiment, after obtaining the contact impedance of the electrode, the measurement module Vsensor12 may further process the impedance of the living body according to the contact impedance to eliminate the influence of the contact impedance on the impedance measurement result of the living body.
In some embodiments, the first switch module 131 is further configured to control the first associated electrode and the third associated electrode to be connected to the measuring module Vsensor12, respectively, so that the measuring module Vsensor12 obtains the impedance of the living body according to the excitation current and the second voltage signal. In order to obtain the impedance of the living body, the first switching module 131 may further control the first and third associated electrodes (two measurement electrodes) to be connected to the measurement module Vsensor12, respectively, so that the contact impedance measurement circuit 100 may also measure the impedance of the living body.
As an example, as shown in fig. 5, the first switch module 131 may be the switch SW0 in fig. 5, and the common terminal S0, the first connection terminal S1, and the first connection terminal S2 of the first switch module 131; still take E1 as the electrode to be measured, E1 and E3 as excitation electrodes, E2 and E4 as measurement electrodes, the common terminal S0 is connected to one end of the measurement module Vsensor12, the other end of the measurement module Vsensor12 is connected to the electrode E2, the first connection terminal S1 is connected to the electrode E4, the second connection terminal S2 is connected to the electrode E1, and two ends of the excitation module Igen11 are respectively connected to the electrode E1 and the electrode E3. When the switch SW0 gates the S0-S1 path, the measuring module Vsensor12 is respectively connected with the measuring electrodes corresponding to the excitation level, the measuring module Vsensor12 measures the voltages at the two ends of b0 and b1, that is, the impedance Zb of the organism, when the switch SW0 gates the S0-S2 path, the measuring module Vsensor12 is respectively connected with the electrode E1 and the electrode E2, the measuring module Vsensor12 measures the voltage between the electrode E1 and the electrode E2, and since no current exists on the electrode E2, the voltage can be equivalent to the voltages at the two ends of b0 and E1, that is, the contact impedance Ze1 of the electrode E1 is measured.
It is understood that fig. 5 is only one example of a contact impedance measurement circuit provided herein. The structure of the contact impedance measurement circuit provided by the present application is not limited thereto.
As another more specific example, referring to fig. 6, in fig. 6, the second switch module 132 may include switches K1, K2, K5 and K6, wherein the switch K1 is connected to the electrode E1, the switch K2 is connected to the electrode E2, the switch K5 is connected to the electrode E3, and the switch K6 is connected to the electrode E4, when the switch K1 or K2 is closed while the switch K5 or the switch K6 is closed, the excitation current outputted from the excitation module Igen11 may be transmitted to the electrode corresponding to the turned-on switch through the switch K1 or K2 and the switch K5 or the switch K6, and then pass through the living body. The first connection module 131 may include switches K3, K4, K7 and K8, where the switch K3 is connected with the electrode E1, the switch K4 is connected with the electrode E2, the switch K7 is connected with the electrode E3, the switch K7 is connected with the electrode E4, and the module Vsensor12 may flexibly measure the contact resistance of any electrode or the impedance of the organism by controlling the on/off of the switches K3, K4, K7 and K8.
In this example, if E1 is the electrode to be measured, in order to obtain the contact impedance of the electrode E1, the switch K1 may be closed, and either of the switches K5, K6 may be closed, while the switches K3, K4 may be closed, and the other switch may be opened, at which time the excitation module Igen11 delivers the excitation current through the electrode E1 and either the electrode E3 or the electrode E4 into the living body, forms a current path and a voltage drop across the Ze1-Zb-Ze3 or the Ze1-Zb-Ze4, connects the measurement module Vsensor12 with the E1, E2 electrodes, respectively, an equivalent diagram of which may be seen in FIG. 7, the excitation module Igen11 in FIG. 7 delivers the excitation current into the living body through the electrode E1 and the electrode E3, andthe current paths are formed on Ze1-Zb-Ze3 or Ze1-Zb-Ze4, the voltage difference Vze1 between the E1 node and the b0 node can be obtained by the measuring module Vsensor12, and then the contact impedance Ze1 can be obtained in a conversion mode according to the excitation current Isin. It should be noted that since the current paths are E1, b0, E3, and there is no current between b0 and E2, and thus there is no voltage drop, the voltage difference between E1 and E2 can be regarded as the voltage difference V between E1 and b0 Ze1 Will be voltage difference V Ze1 The contact resistance Ze1 can be obtained by dividing the current Isin. In addition, the excitation module Igen11 may be connected to the electrodes E1, E4 (not shown in FIG. 7), i.e. the excitation signal Isin is supplied to the living body via the electrodes E1, E4, in which case a current path is formed over Ze1-Zb-Ze4 and a voltage drop is formed, and the measurement module Vsensor12 is connected to the electrodes E1, E2, respectively, so as to obtain the voltage difference V between the nodes E1 and b0 Ze1 The contact impedance Ze1 can then be scaled from the current Isin.
In this example, if E3 is the electrode to be measured, in order to obtain the contact impedance of the electrode E3, the switch K5 needs to be closed, and either one of the switches K1 and K2 needs to be closed, while the other switch is opened, at this time, the excitation module Igen11 transmits the excitation current to the living body through the electrode E3 and the electrode E1 or the electrode E2, at this time, a current path is formed on the electrode E3-Zb-Ze1 or the electrode E3-Zb-Ze2 and a voltage drop is formed, the measurement module Vsensor12 is connected to the electrodes E3 and E4, respectively, as shown in fig. 8, the equivalent diagram of this case can be seen by the excitation module Igen11 in fig. 8 transmitting the excitation current to the living body through the electrode E1 and the electrode E3, forming a current path on the electrode E3-Zb-Ze1 or the electrode E3-Zb-Ze2, the measurement module Vsensor12 can obtain the voltage difference V between the node E3 and the node b1 ze3 The contact impedance Ze3 can then be scaled from the current Isin. Likewise, there is no current flow between b1 and E4, and thus no voltage drop, and the voltage difference between E3 and E4 can be regarded as the voltage difference V between E3 and b1 Ze3 . Furthermore, excitation module Igen11 can also be connected directly to electrodes E2, E3 (not shown in fig. 8); that is, the excitation module Igen transmits the current signal Isin to the living body through the electrodes E2 and E3, at this time, a current path is formed on the Ze1-Zb-Ze3 and a voltage drop is formed, and the measuring module Vsensor is respectively connected with the electrodes E3 and E4Thereby obtaining the voltage difference V between the E3 and the b1 node ze3 The contact impedance Ze3 can then be scaled from the current Isin.
In this example, if E2 is the electrode to be measured, in order to obtain the contact impedance of the electrode E2, the switch K2 may be closed, and either of the switches K5, K6 may be closed, while the switches K3, K4 may be closed, and the other switch may be opened, at this time, the excitation module Igen11 sends the excitation current to the living body through the electrode E2, and the electrode E3 or the electrode E4, at this time, a current path is formed on the Ze2-Zb-Z3 or the Ze2-Zb-Ze4 and a voltage drop is formed, and the measurement module Vsensor12 is connected to the electrodes E1, E2, respectively, to obtain the voltage difference V between the nodes E2 and b0 ze2 The contact impedance Ze2 can then be scaled from the current Isin.
In this example, if E4 is the electrode to be measured, to obtain the contact impedance of E4, switch K6 may be closed, and either of switches K1, K2 may be closed, while switches K7, K8 may be closed, and the other switch opened, at this time, excitation module Igen11 sends excitation current to the organism through E4 and either E1 or E2, at this time, a current path is formed on Ze4-Zb-Z1 or Ze4-Zb-Ze1 and a voltage drop is formed, and measurement module Vsensor is connected to the electrodes of switches E3, E4, respectively, to obtain the voltage difference V between E4 and node b1 ze4 The contact impedance Ze4 can then be scaled from the current Isin.
In this example, the distance a between electrode E1 and electrode E3 is greater than the distance C between electrode E1 and electrode E2.
It will be appreciated that fig. 6-8 are only one example of a contact impedance measurement circuit provided herein. The structure of the contact impedance measurement circuit provided by the present application is not limited thereto.
The embodiment of the application discloses a contact impedance measurement circuit, excitation module Igen11 is connected with different electrode units respectively, and output excitation current through the electrode units that connect, measurement module Vsensor12 is connected with electrode and first associated electrode respectively when the electrode that awaits measuring is connected to excitation module Igen11, and obtain the first voltage signal between them, obtain the contact impedance of at least one electrode that awaits measuring according to excitation current and first voltage signal, the measurement of contact impedance has been realized, the accuracy to organism impedance measurement has been improved, and because the return circuit of excitation current is different with the return circuit of measuring first voltage signal, partial limb impedance in the organism has reduced the influence to the anti measuring result of contact group when measuring contact impedance, further improved the degree of accuracy of contact impedance measurement, thereby make organism impedance's measuring result more accurate.
It should be noted that, the contact impedance changes along with temperature, pressure, skin state, etc., which affects the accuracy of measuring the organism impedance, and the contact condition of the skin and the electrode can be obtained through the contact impedance, and whether the measurement gesture is normal or not can be judged, and the measurement abnormality is reminded, so that the accuracy of measuring the contact impedance is significant.
The embodiment of the application provides a contact impedance measurement method, which can be applied to the contact impedance measurement circuit in the embodiment, and comprises the following steps:
outputting an excitation current through at least two electrode units; wherein the electrode unit comprises two electrodes;
acquiring a first voltage signal between an electrode to be detected and a first associated electrode; the first correlation electrode is another electrode except the electrode to be detected in the electrode unit comprising the electrode to be detected;
and acquiring the contact impedance of the electrode to be tested according to the excitation current and the first voltage signal.
In some embodiments, outputting the excitation current through the at least two electrode units further comprises: outputting excitation current through the electrode to be tested and the second associated electrode; the second associated electrode is any electrode in another electrode unit which does not comprise the electrode to be measured.
In some embodiments, the two electrodes of the electrode unit are an excitation electrode and a measurement electrode, respectively; when the electrode to be measured and the second associated electrode are excitation electrodes, the first associated electrode is a measurement electrode, and the contact impedance measurement method further comprises:
acquiring a second voltage signal between the first correlation electrode and the third correlation electrode; wherein the third associated electrode is a measuring electrode corresponding to the second associated electrode;
the impedance of the living being is obtained from the excitation current and the second voltage signal.
The specific description of the method may refer to the specific description of the foregoing embodiments, which is not repeated in this embodiment.
According to the embodiment of the application, the excitation current is output through the at least two electrode units, the first voltage signal between the electrode to be measured and the first associated electrode is obtained, the contact impedance of the at least one electrode to be measured is obtained according to the excitation current and the first voltage signal, the measurement of the contact impedance is realized, the accuracy of measuring the impedance of the organism is improved, and due to the fact that a loop of the excitation current is different from a loop of measuring the first voltage signal, the influence of partial limb impedance in the organism on the contact group impedance measurement result in the process of measuring the contact impedance is reduced, and the accuracy of measuring the contact impedance is further improved, so that the measurement result of the impedance of the organism is more accurate.
The embodiment of the present application provides a contact impedance detection device, please refer to fig. 9, the contact impedance measurement device 300 includes a contact impedance measurement circuit 100 and at least two electrode units 20, wherein the electrode units 20 include two electrodes.
In some embodiments, referring to fig. 10, the contact impedance measuring apparatus 300 further includes a switch module 13, where the switch module 13 is used to control the connection state of the electrode and the measuring module or the exciting module.
As an embodiment, the switch module 13 includes a first switch module for controlling connection or disconnection of the electrode and the measuring module, so that the electrode to be measured and the first associated electrode are respectively connected to the measuring module Vsensor12, or so that the first associated electrode and the third associated electrode are respectively connected to the measuring module Vsensor 12.
As an embodiment, the switch module 13 further comprises a second switch module 132 for controlling the connection or disconnection of the electrodes to the excitation module Igen11, so that the electrodes to be tested and the second associated electrodes are respectively connected to the excitation module Igen 11.
The specific description of the switch module may refer to the specific description of the foregoing embodiment, which is not repeated in this embodiment.
The switching module 13 may be provided in addition to the contact impedance measuring circuit 100, but also in addition to the contact impedance measuring circuit 100, as long as it can control the connection state of the electrodes 20 in the at least two electrode units 20 with the excitation module Igen11 or the measuring module Vsensor12, respectively.
Referring to fig. 11, a chip 400 includes a contact impedance measuring circuit 100.
The embodiment of the application provides an electronic device 500, which includes a device body and a contact impedance measuring apparatus 300, at least two electrode units 20 are disposed on the device body. Referring to fig. 12 and 13, the electronic device 500 may further include a chip 400 or contact the impedance measuring circuit 100. The electronic device 500 may be, but is not limited to, a weight scale, a body fat scale, a nutritional scale, an infrared electronic thermometer, a pulse oximeter, a body composition analyzer, a stylus, a real wireless headset, an automobile, a smart wearable device, a mobile terminal. The intelligent wearing equipment comprises, but is not limited to, an intelligent watch, an intelligent bracelet and a cervical vertebra massage instrument. Mobile terminals include, but are not limited to, smartphones, notebook computers, tablet computers, POS (point ofsales terminal, point of sale terminal) machines.
As an example, when the electronic device is a body scale or a body composition analyzer, the number of electrodes may be 4, or the number of electrodes may be 8. When the number of the electrodes is 4, as shown in the application scenario in fig. 1, the 4 electrodes are divided into two groups of electrode units; when the number of electrodes is 8, the 8 electrodes are divided into four groups of electrode units.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples only represent preferred embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (16)
1. A contact impedance measurement circuit, characterized in that the contact impedance measurement circuit comprises an excitation module and a measurement module;
the excitation module is used for being respectively connected with at least two electrode units and outputting excitation current through the at least two electrode units; wherein the electrode unit comprises two electrodes;
the measuring module is used for:
when the electrode to be measured is connected with the excitation module, the electrode to be measured is respectively connected with the electrode to be measured and the first associated electrode;
acquiring a first voltage signal between the electrode to be detected and the first associated electrode; the electrode to be measured is any electrode in any electrode unit, and the first associated electrode is the other electrode except the electrode to be measured in the electrode unit comprising the electrode to be measured;
and acquiring the contact impedance of at least one electrode to be tested according to the excitation current and the first voltage signal.
2. The contact impedance measurement circuit of claim 1, wherein the excitation module is further configured to be connected to the electrode under test and a second associated electrode, respectively, and to output the excitation current through the electrode under test and the second associated electrode; wherein the second associated electrode is any one of the electrodes in the other electrode unit excluding the electrode to be measured.
3. The contact impedance measurement circuit of claim 2, further comprising a switch module;
the switch module is used for controlling the connection state of the electrode and the measurement module or the excitation module.
4. A contact impedance measurement circuit according to claim 3, wherein the switch module comprises a first switch module;
the first switch module is used for controlling the electrode to be measured and the first associated electrode to be connected to the measurement module respectively, so that the measurement module obtains the contact impedance of at least one electrode to be measured according to the excitation current and the first voltage signal.
5. The contact impedance measurement circuit of claim 3 wherein the switch module further comprises a second switch module;
the second switch module is used for controlling connection or disconnection of the electrode and the excitation module so that the electrode to be detected and the second associated electrode are respectively connected with the excitation module.
6. The contact impedance measurement circuit of claim 4 wherein two of the electrodes in the electrode unit are an excitation electrode and a measurement electrode, respectively; when the electrode to be measured and the second associated electrode are the excitation electrodes, the first associated electrode is the measurement electrode, and the measurement module is further configured to:
the first associated electrode and the third associated electrode are respectively connected with the first associated electrode and the third associated electrode; wherein the third associated electrode is the measurement electrode corresponding to the second associated electrode;
acquiring a second voltage signal between the first associated electrode and the third associated electrode;
and acquiring the impedance of the organism according to the excitation current and the second voltage signal.
7. The contact impedance measurement circuit of claim 6, wherein the first switch module is further configured to control the first and third associated electrodes to be respectively connected to the measurement module such that the measurement module obtains the impedance of the living being based on the excitation current and the second voltage signal.
8. A contact impedance measurement method, characterized in that the contact impedance measurement method comprises:
outputting an excitation current through at least two electrode units; wherein the electrode unit comprises two electrodes;
acquiring a first voltage signal between an electrode to be detected and a first associated electrode; the electrode to be measured is any electrode in any electrode unit, and the first associated electrode is the other electrode except the electrode to be measured in the electrode unit comprising the electrode to be measured;
and acquiring the contact impedance of the electrode to be tested according to the excitation current and the first voltage signal.
9. The contact impedance measurement method according to claim 8, wherein the outputting of the excitation current through the at least two electrode units further comprises: outputting the excitation current through the electrode to be detected and the second associated electrode; wherein the second associated electrode is any one of the electrodes in the other electrode unit excluding the electrode to be measured.
10. The contact impedance measurement method according to claim 9, wherein the two electrodes of the electrode unit are an excitation electrode and a measurement electrode, respectively; when the electrode to be measured and the second associated electrode are the excitation electrodes, the first associated electrode is the measurement electrode, and the contact impedance measurement method further includes:
acquiring a second voltage signal between the first associated electrode and the third associated electrode; wherein the third associated electrode is the measurement electrode corresponding to the second associated electrode;
and acquiring the impedance of the organism according to the excitation current and the second voltage signal.
11. A contact impedance detection device, characterized by comprising:
at least two electrode units including two electrodes;
and a contact impedance measuring circuit as claimed in any one of claims 1 to 7.
12. The bioimpedance detection device of claim 11, further comprising a switch module;
the switch module is used for controlling the connection state of the electrode and the measurement module or the excitation module.
13. The bioimpedance detection device of claim 12, wherein the switch module comprises a first switch module;
the first switch module is used for controlling connection or disconnection of the electrode and the measurement module so as to enable the electrode to be measured and the first associated electrode to be connected with the measurement module respectively, or enable the first associated electrode and the third associated electrode to be connected with the measurement module respectively.
14. The bioimpedance detection device of claim 12, wherein the switch module comprises a second switch module;
the second switch module is used for controlling connection or disconnection of the electrode and the excitation module so that the electrode to be detected and the second associated electrode are respectively connected with the excitation module.
15. A chip comprising the contact impedance measurement circuit of any one of claims 1-7.
16. An electronic device comprising a contact impedance measurement circuit according to any one of claims 1-7, or a contact impedance measurement apparatus according to any one of claims 11-14, or a chip according to claim 15.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210961047.9A CN117617938A (en) | 2022-08-11 | 2022-08-11 | Contact impedance measuring circuit, method, detecting device, chip and electronic equipment |
| PCT/CN2023/112251 WO2024032722A1 (en) | 2022-08-11 | 2023-08-10 | Contact impedance measurement circuit and method, detection apparatus, chip, and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210961047.9A CN117617938A (en) | 2022-08-11 | 2022-08-11 | Contact impedance measuring circuit, method, detecting device, chip and electronic equipment |
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| CN117617938A true CN117617938A (en) | 2024-03-01 |
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| CN202210961047.9A Pending CN117617938A (en) | 2022-08-11 | 2022-08-11 | Contact impedance measuring circuit, method, detecting device, chip and electronic equipment |
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| CN (1) | CN117617938A (en) |
| WO (1) | WO2024032722A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008298459A (en) * | 2007-05-29 | 2008-12-11 | Nippon Denki Keiki Kenteisho | Device for measuring impedance |
| US20150293045A1 (en) * | 2014-04-11 | 2015-10-15 | Texas Instruments Incorporated | Measuring electrode impedance in an impedance measurement circuit |
| US11579106B2 (en) * | 2019-07-01 | 2023-02-14 | Texas Instruments Incorporated | High accuracy impedance measurement |
| CN212679093U (en) * | 2020-03-13 | 2021-03-12 | 芯海科技（深圳）股份有限公司 | Impedance measuring circuit and impedance measuring apparatus |
| CN114073511B (en) * | 2020-08-21 | 2023-11-14 | 北京华睿博视医学影像技术有限公司 | Excitation response measurement method, electrical impedance imaging method, and storage medium |
| CN114711746A (en) * | 2022-03-24 | 2022-07-08 | 北京华睿博视医学影像技术有限公司 | Electrical impedance imaging method, electrical impedance imaging device, storage medium, and electronic apparatus |
| CN115363556A (en) * | 2022-08-02 | 2022-11-22 | 西安芯海微电子科技有限公司 | Contact impedance measuring circuit, method and device, chip and electronic equipment |
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