CN111904418A

CN111904418A - Impedance measuring method and impedance measuring apparatus

Info

Publication number: CN111904418A
Application number: CN202010794963.9A
Authority: CN
Inventors: 李晓; 丁俊涛
Original assignee: Chipsea Technologies Shenzhen Co Ltd
Current assignee: Chipsea Technologies Shenzhen Co Ltd
Priority date: 2020-08-10
Filing date: 2020-08-10
Publication date: 2020-11-10

Abstract

The application provides an impedance measuring method and impedance measuring equipment, wherein a first exciting current is firstly introduced, and the first exciting current flows through a first upper limb, a trunk and a second lower limb. Second, a first voltage is measured between the second upper limb and the first lower limb while the first excitation current is applied. Finally, a first impedance of the torso is determined based on the first voltage and the first excitation current. By adopting the cross measurement method, the trunk impedance measurement is more accurate, and the measurement accuracy of other sections of impedance is improved.

Description

Impedance measuring method and impedance measuring apparatus

Technical Field

The present application relates to the field of impedance measurement technologies, and in particular, to an impedance measurement method and an impedance measurement apparatus.

Background

The electrical conductivity of the human body is closely related to the water content. Most of the water of the human body exists in human muscle and body fluid. Human adipose tissue is hydrophobic and thus has a low water content. The relative fat content, i.e. the body fat content, of a human body or a part of a human body can be determined by measuring the impedance (or by measuring the electrical conductivity) of the human body or a part of a human body.

When the human body impedance is measured, the impedance of each section of the human body (the impedance of each section of the human body comprises the impedance of a left upper limb, the impedance of a right upper limb, the impedance of a left lower limb, the impedance of a right lower limb and the impedance of a trunk) can be measured by selecting different combination modes of current excitation and voltage excitation. Conventional solutions mainly include 4-electrode measurement and 8-electrode measurement for body impedance measurement. The 4-electrode measurement method mainly measures the impedance between the two lower limbs of the human body. The 8-electrode measurement method mainly measures the impedance of all sections of the whole body of a human body. In the 8-electrode measurement method, the impedance of the whole body is approximately equivalent to a model with 5 impedances (the impedance of a left upper limb, the impedance of a right upper limb, the impedance of a left lower limb, the impedance of a right lower limb and the impedance of a trunk), then the impedance of each section of the human body is obtained by measuring the combined impedance of a plurality of paths from the upper limb to the lower limb and solving an equation.

When measuring the impedance of various segments of the whole body of a human body by using an 8-electrode measurement method, an important parameter is the trunk impedance of the human body. The trunk impedance is generally more difficult to measure than the limb impedance due to the large cross section and limited length of the trunk. Therefore, the measurement error of the trunk impedance severely restricts the measurement accuracy of the impedance of other sections.

Disclosure of Invention

Therefore, it is necessary to provide an impedance measuring method and an impedance measuring apparatus for solving the problem that the measurement error of the existing trunk impedance seriously restricts the measurement accuracy of the impedance of each other segment.

An impedance measurement method for measuring impedance of a body of a subject, the subject including a first upper limb, a second upper limb, a torso, a first lower limb, and a second lower limb, the first upper limb and the first lower limb being ipsilateral to the torso, the second upper limb and the second lower limb being ipsilateral to the torso, the impedance measurement method comprising:

a first excitation current is introduced, and the first excitation current flows through the first upper limb, the trunk and the second lower limb;

measuring a first voltage between the second upper limb and the first lower limb when the first excitation current is applied;

determining a first impedance of the torso based on the first voltage and the first excitation current.

An impedance measurement device comprising: the device comprises a first excitation electrode, a first measuring electrode, a second excitation electrode, a third excitation electrode, a fourth excitation electrode, a third measuring electrode, a fourth measuring electrode and a control module;

the first excitation electrode and the first measuring electrode are respectively used for being electrically connected with a first upper limb of a subject, the second measuring electrode and the second excitation electrode are respectively used for being electrically connected with a second upper limb of the subject, the third excitation electrode and the third measuring electrode are used for being electrically connected with a first lower limb of the subject, and the fourth excitation electrode and the fourth measuring electrode are used for being electrically connected with a second lower limb of the subject;

the control module is electrically connected to the first excitation electrode, the first measurement electrode, the second excitation electrode, the third excitation electrode, the fourth excitation electrode, the third measurement electrode, and the fourth measurement electrode, respectively, and is configured to perform the impedance measurement method according to any one of the embodiments.

Compared with the prior art, the impedance measuring method and the impedance measuring device firstly supply the first exciting current, and enable the first exciting current to flow through the first upper limb, the trunk and the second lower limb. Second, a first voltage is measured between the second upper limb and the first lower limb while the first excitation current is applied. Finally, a first impedance of the torso is determined based on the first voltage and the first excitation current. The method for measuring the trunk impedance is adopted, so that the trunk impedance is measured more accurately, and the measurement accuracy of the impedance of other sections is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a flowchart of an impedance measurement method according to an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a subject provided in an embodiment of the present application;

fig. 3 is a block diagram of an impedance measurement system according to an embodiment of the present application;

fig. 4 is an actual view of an impedance measurement system provided by an embodiment of the present application;

FIG. 5 is a flow chart of an impedance measurement method according to another embodiment of the present application;

fig. 6 is a schematic partial structural diagram of an impedance measurement system according to an embodiment of the present application;

fig. 7 is a block diagram of an impedance measurement system according to another embodiment of the present application.

Description of reference numerals:

10. an impedance measurement system; 11. a subject; 100. a control module; 101. a first excitation electrode; 102. a first measuring electrode; 103. a second measuring electrode; 104. a second excitation electrode; 105. a third excitation electrode; 106. a fourth measuring electrode; 107. a third measuring electrode; 108. a fourth excitation electrode; 109. a weighing sensor; 110. a first upper limb; 120. a second upper limb; 130. a torso; 140. a first lower limb; 150. a second lower limb; 200. a handle; 300. a base; 400. a detection module; 500. a triggering module; 600. a display module; 700. and a power supply module.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the embodiments disclosed below.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and fig. 2, an embodiment of the present application provides an impedance measurement method for measuring a body impedance of a subject. Subject 11 includes a first upper limb 110, a second upper limb 120, a torso 130, a first lower limb 140, and a second lower limb 150. The first upper limb 110 and the first lower limb 140 are positioned ipsilaterally with respect to the torso 130. Second upper limb 120 and second lower limb 150 are positioned ipsilaterally with respect to torso 130. In one embodiment, subject 11 may be a human body.

In one embodiment, the impedance measurement method may employ an 8-electrode impedance measurement device 10 for measurement. Specifically, the impedance network of the subject 11 may be approximately equivalent to 5 segment impedances (first upper limb impedance, second upper limb impedance, first lower limb impedance, second lower limb impedance, trunk impedance) corresponding to the limb structure of the subject 11, and then constituent parameters of each body segment or the whole of the subject 11, such as body fat percentage, moisture content, bone salt amount, and the like, may be determined by measuring each segment impedance.

In one embodiment, as shown in fig. 3 and 4, the impedance measuring apparatus 10 may include: a first excitation electrode 101, a first measurement electrode 102, a second measurement electrode 103, a second excitation electrode 104, a third excitation electrode 105, a fourth excitation electrode 106, a third measurement electrode 107, a fourth measurement electrode 108, and a control module 100. In measurement, the first excitation electrode 101 and the first measurement electrode 102 are respectively used to contact with the second upper limb 120 of the subject 11 to form an electrical connection. The second measuring electrode 103 and the second excitation electrode 104 are each for contact with a first upper limb 110 of the subject 11 to form an electrical connection. The third excitation electrode 105 and the third measurement electrode 107 are for making electrical contact with the first lower limb 140 of the subject 11. Fourth excitation electrode 106 and fourth measurement electrode 108 are adapted to be in contact with a second lower limb 150 of subject 11 to form an electrical connection. The control module 100 is electrically connected to a first excitation electrode 101, a first measurement electrode 102, a second measurement electrode 103, a second excitation electrode 104, a third excitation electrode 105, a fourth excitation electrode 106, a third measurement electrode 107 and a fourth measurement electrode 108, respectively. The control module 100 is used to perform an impedance measurement method.

As shown in fig. 1, the impedance measuring method includes:

s101: a first excitation current is applied and flows through the first upper limb 110, the torso 130, and the second lower limb 150.

Alternatively, the first excitation current may be passed from the first upper limb 110 of the subject 11 through the torso 130 to the second lower limb 150; or from the second lower limb 150 and through the torso 130 to the first upper limb 110; it is also possible to pass the test object 11 alternately in the two directions mentioned above. For example, second excitation electrode 104 may be electrically connected to first upper limb 110, and fourth excitation electrode 106 may be electrically connected to second lower limb 150. Thus, a first excitation current can be applied to the subject 11 through the two excitation electrodes, and the first excitation current flows through the first upper limb 110, the trunk 130, and the second lower limb 150.

In one embodiment, the electrical connection of the second excitation electrode 104 to the first upper limb 110 is: the second excitation electrode 104 may be electrically connected to any location of the first upper limb 110. For example, the second excitation electrode 104 may be electrically connected to the palm of the first upper limb 110, and the second excitation electrode 104 may also be electrically connected to the elbow joint of the first upper limb 110 or other locations of the arm. Similarly, electrically connecting fourth excitation electrode 106 to second lower limb 150 means: the fourth excitation electrode 106 may be electrically connected to any location of the second lower limb 150. For example, the fourth excitation electrode 106 may be electrically connected to the sole of the second lower limb 150, and the fourth excitation electrode 106 may also be electrically connected to the knee joint of the second lower limb 150 or other positions of the leg. In one embodiment, the magnitude of the first excitation current is selected according to at least one physiological parameter of the subject 11, such as weight, height, age, and sex, and is not limited to a specific value.

S102: a first voltage is measured between the second upper limb 120 and the first lower limb 140 while the first excitation current is passed.

Specifically, the first measuring electrode 102 may be electrically connected to the second upper limb 120, and the third measuring electrode 107 may be electrically connected to the first lower limb 140. Thus, when the first excitation current is applied, a first voltage between the second upper limb 120 and the first lower limb 140 can be measured via the two measuring electrodes. In one embodiment, the first voltage may also be measured by other means, as long as it is ensured that the voltage between the second upper limb 120 and the first lower limb 140 is available.

In one embodiment, the first measuring electrode 102 is electrically connected to the second upper limb 120 by: the first measuring electrode 102 may be electrically connected to any location of the second upper limb 120. For example, the first measuring electrode may be electrically connected to the palm of the second upper limb 120, and the first measuring electrode 102 may also be electrically connected to the elbow joint of the second upper limb 120 or other locations of the arm. Similarly, the electrical connection of the third measuring electrode 107 to the first lower limb 140 means: the third measuring electrode 107 may be electrically connected to any location of the first lower limb 140. For example, the third measuring electrode 107 can be electrically connected to the sole of the first lower limb 140, and the third measuring electrode 107 can also be electrically connected to the knee joint of the first lower limb 140 or other positions of the leg.

When the first excitation current is applied, the first excitation current flows through the first upper limb 110, the torso 130, and the second lower limb 150, but not through the second upper limb 120 and the first lower limb 140, and the flow direction of the first excitation current in the torso 130 may be approximately equivalent to flowing along a first diagonal of the torso 130. The first diagonal line is a connecting line from the joint between the first upper limb 110 and the trunk 130 to the joint between the second lower limb 150 and the trunk 130. Wherein, the connection between any upper limb and the trunk 130 includes the area from the shoulder corresponding to the upper limb to the armpit; correspondingly, the junction between any lower limb and the torso 130 includes the region between the base of the thigh to the groin for that lower limb.

Therefore, when measuring the first voltage between the second upper limb 120 and the first lower limb 140, since no current flows through the second upper limb 120 and no voltage drop exists, the measurement point of the second upper limb 120 (i.e., the contact point of the second upper limb 120 and the first measurement electrode 102) and the shoulder of the second upper limb 120 are equipotential points, i.e., the potentials between the two are equal. At the same time, since the first excitation current is transmitted along the first diagonal line of the trunk 130, substantially no current flows between the shoulder of the second upper limb 120 and the shoulder of the first upper limb 110, so that the shoulder of the second upper limb 120 and the shoulder of the first upper limb 110 are equipotential points. In other words, the measurement point of the second upper limb 120 may be equivalent to the shoulder of the first upper limb 110.

Similarly, when the first excitation current is applied, the measurement point of the first lower limb 140 can be equivalent to the groin position because no current flows through the first lower limb 140 and substantially no current flows between the base of the thigh of the first lower limb 140 and the groin.

As can be seen from the above, when the first excitation current is applied, the measured first voltage between the second upper limb 120 and the first lower limb 140 can be equivalent to the voltage between the shoulder and the groin of the first upper limb 110, i.e., the voltage of the trunk 130.

S103: a first impedance of the torso is determined based on the first voltage and the first excitation current.

Since the first voltage may be equivalent to the voltage of the torso 130, the first impedance determined based on the first voltage and the first excitation current may be equivalent to the impedance of the torso.

When the trunk impedance is measured in a traditional way, an ipsilateral measurement way is usually adopted, namely, exciting current is introduced between the upper limb and the lower limb on one side of the trunk, voltage between the upper limb and the lower limb on the other side of the trunk is measured, and the impedance obtained according to the voltage is equivalent to the impedance of the trunk. The impedance measured by this ipsilateral measurement approach is approximately equal to the impedance between the shoulder of the first upper limb 110 and the base of the thigh of the first lower limb 140, i.e., the impedance of only one side of the torso 130, and does not accurately represent the overall impedance of the torso 130.

In this embodiment, the first excitation current flows along substantially the first diagonal of the torso 130, and thus has a longer transmission path and flows through more regions of the torso 130 than excitation currents flowing along the same side of the torso 130 in a single-sided measurement. Therefore, the measurement method of the present embodiment (hereinafter referred to as "cross measurement method") can represent the actual condition of the trunk 130 more than the conventional one-sided measurement method. The first voltage measured in the manner of the cross measurement described above is closer to the overall voltage drop of the torso 130. Accordingly, the first impedance determined based on the first voltage and the first excitation current is also closer to the overall impedance of the torso 130, thus enabling improved accuracy of torso impedance measurements.

In one embodiment, as shown in fig. 5, after step S103, the impedance measuring method may further include the steps of:

s104: the first excitation current is switched off and the second excitation current is switched on and flows through the second upper limb 120, the torso 130 and the first lower limb 140.

Alternatively, the first excitation current may be cut off manually or by switching.

Alternatively, the second excitation current may be passed by the second upper limb 120 of the subject 11 and flow through the torso 130 to the first lower limb 140; or from the first lower limb 140 to the second upper limb 120 via the torso 130; it is also possible to pass the test object 11 alternately in the two directions mentioned above. Specifically, first excitation electrode 101 may be electrically connected to second upper limb 120, and third excitation electrode 105 may be electrically connected to first lower limb 140. Thus, a second excitation current can be applied to the subject 11 via the two excitation electrodes, and the second excitation current flows through the second upper limb 120, the torso 130, and the first lower limb 140.

In one embodiment, the first excitation electrode 101 is electrically connected to the second upper limb 120 by: the first excitation electrode 101 may be electrically connected to any location of the second upper limb 120. Similarly, electrically connecting third excitation electrode 105 to first lower limb 140 means: the third excitation electrode 105 may be electrically connected to any location of the first lower limb 140.

In one embodiment, the magnitude of the second excitation current may be the same as or different from the first excitation current. Specifically, the magnitude of the second excitation current may be selected according to at least one physiological parameter of the subject 11, such as weight, height, age, and sex, and is not limited to a specific value.

S105: a second voltage is measured between the first upper limb 110 and the second lower limb 150 while the second excitation current is applied.

Specifically, the second measuring electrode 103 may be electrically connected to the first upper limb 110, and the fourth measuring electrode 108 may be electrically connected to the second lower limb 150. A second voltage between first upper limb 110 and second lower limb 150 can thus be measured via the two measuring electrodes when the second excitation current is applied. In one embodiment, the second voltage may also be measured by other means, as long as it is ensured that a voltage between the first upper limb 110 and the second lower limb 150 is available.

The electrical connection between the second measuring electrode 103 and the first upper limb 110 is as follows: the second measuring electrode 103 may be electrically connected to any position of the first upper limb 110. Similarly, electrically connecting fourth measurement electrode 108 to second lower limb 150 means: the fourth measurement electrode 108 may be electrically connected to any location of the second lower limb 150.

When the second excitation current is applied, the second excitation current flows through the second upper limb 120, the trunk 130, and the first lower limb 140, and does not flow through the first upper limb 110 and the second lower limb 150, so that the measurement point of the first upper limb 110 (i.e., the contact point of the first upper limb 110 and the second measurement electrode 103) and the shoulder of the first upper limb 110 are equipotential points. At the same time, since the second excitation current is transmitted along the second diagonal line of the trunk 130, so that substantially no current flows from the shoulder of the second upper limb 120 to the shoulder of the first upper limb 110, the shoulder of the first upper limb 110 and the shoulder of the first upper limb 110 are equipotential points, in other words, the measurement point of the first upper limb 110 can be equivalent to the shoulder of the second upper limb 120.

Similarly, when the second excitation current is applied, the measurement point of the second lower limb 150 can be equivalent to the groin position because no current flows through the second lower limb 150 and substantially no current flows between the root of the thigh of the second lower limb 150 and the groin.

As can be seen from the above, when the second excitation current is applied, the measured second voltage between the first upper limb 110 and the second lower limb 150 can be equivalent to the voltage between the shoulder of the second upper limb and the groin, i.e., the voltage of the trunk 130.

S106: a second impedance of the torso 130 is determined based on the second voltage and the second excitation current.

Since the second voltage may be equivalent to the voltage of the torso 130, the impedance determined based on the second voltage and the second excitation current may be equivalent to a second impedance of the torso.

In this embodiment, the second excitation current flows along a second diagonal of the torso 130, and thus has a longer transmission path and flows through more regions of the torso 130 than excitation currents applied along the same side of the torso 130 in a single-sided measurement. Therefore, the measurement method of the present embodiment (hereinafter referred to as "cross measurement method") can represent the actual condition of the trunk 130 more than the conventional one-sided measurement method. The second voltage measured in the manner described above as a cross-measurement is closer to the overall voltage drop of torso 130. Accordingly, the second impedance determined based on the second voltage and the second excitation current is also closer to the overall impedance of the torso 130, thus enabling improved accuracy of torso impedance measurements.

In one embodiment, after measuring the first voltage and the second voltage, the control module 100 may also determine the impedance of the torso 130 based on the first voltage, the second voltage, the first excitation current, and the second excitation current. Specifically, a first impedance can be obtained according to a first voltage and a first excitation current; and obtaining a second impedance according to the second voltage and the second excitation current. The first impedance and the second impedance may then be averaged, thereby obtaining the impedance of torso 130. In this embodiment, the impedance of the torso 130 is determined by averaging the first impedance and the second impedance, which may make the final measurement of the impedance of the torso 130 more accurate relative to the first impedance or the second impedance.

In one embodiment, the first voltage and the second voltage may be averaged to obtain a mean voltage; averaging the first excitation current and the second excitation current to obtain an average excitation current; the impedance of torso 130 may then be derived from the mean voltage and the mean excitation current. The impedance of the torso 130 may also be determined in the manner described above. The present embodiment may enable the impedance of the trunk 130 to be measured more accurately with respect to the first impedance or the second impedance by calculating the mean voltage and the mean excitation current, and finally determining the impedance of the trunk 130 according to the mean voltage and the mean excitation current.

In one embodiment, the impedance measuring method further includes: while the first excitation current is being applied, a third voltage is measured between the first upper limb 110 and the first lower limb 140, and a third impedance of the first upper limb 110 is determined based on the third voltage and the first excitation current.

In one embodiment, a third voltage between the first upper limb 110 and the first lower limb 140 may be measured when the first excitation current is applied to the subject 11. Specifically, the second measuring electrode may be electrically connected to the first upper limb 110, and the third measuring electrode may be electrically connected to the first lower limb 140. Thus, when the first excitation current is applied, a third voltage between the first upper limb 110 and the first lower limb 140 can be measured via the two measuring electrodes. In one embodiment, the third voltage may also be measured by other means, as long as it is ensured that the voltage between the first upper limb 110 and the first lower limb 140 is available.

As mentioned above, when the first excitation current is applied, no current flows through the first lower limb 140, so that the measurement point of the first lower limb 140 (i.e. the contact point of the first lower limb 140 and the third measurement electrode 107) and the root of the thigh of the first lower limb 140 are equipotential points. Meanwhile, since the first excitation current is transmitted along the first diagonal of the trunk 130, substantially no current flows between the root of the first lower limb 140 and the underarm portion of the first upper limb 110 (i.e., the connection between the first upper limb 110 and the trunk 130), so that the root of the first lower limb 140 and the underarm portion of the first upper limb 110 are equipotential points. In other words, the measurement point of the first lower limb 140 can be equivalent to the underarm portion of the first upper limb 110. As can be seen from the above, when the first excitation current is applied, the measured third voltage between the first upper limb 110 and the first lower limb 140 can be equivalent to the voltage from the measurement point of the first upper limb 110 to the underarm region, i.e. the voltage of the first upper limb 110.

In one embodiment, the third voltage is indicative of the voltage between the measurement point of the first upper limb 110 (i.e., the location where the first upper limb 110 is in contact with the second measurement electrode) and the junction of the first upper limb 110 and the torso 130. Accordingly, the third impedance characterizes the bioelectrical impedance between the measurement point of the first upper limb 110 and the junction of the first upper limb 110 and the torso 130, i.e. the impedance of the first upper limb 110. Wherein the third impedance may be the overall impedance or a partial segment of the impedance of the first upper limb 110. For example, if the second measurement electrode is electrically connected to the palm of the first upper limb 110 (in this case, the third measurement electrode may be electrically connected to any position of the first lower limb 140), the third impedance is the impedance of the whole first upper limb 110. If the second measuring electrode is electrically connected to the elbow joint of the first upper limb 110, the third impedance is the impedance between the elbow joint and the junction of the first upper limb 110 and the torso 130.

In the embodiment, the third voltage is measured while the first excitation current is introduced, and the impedance of the first upper limb of the tested object can be accurately measured, so that the trunk impedance of the tested object can be determined, the impedance of the specific limb segment of the tested object can be determined, and the comprehensiveness and the accuracy of the impedance measurement result are improved. In this case, before or after the first impedance is determined, the impedance of the first upper limb of the subject may be determined by adjusting the voltage measurement point without changing the path of the excitation current, so as to improve the overall measurement efficiency. Alternatively, the steps of this embodiment may also be implemented after step S106, and at this time, the impedance measurement of the first upper limb may be performed after the impedance measurement of the trunk is completed, so as to improve the efficiency of the trunk impedance measurement.

In one embodiment, the impedance measuring method further includes: while the first excitation current is being passed, a fourth voltage is measured between the first upper limb 110 and the second upper limb 120. A fourth impedance of the first upper limb 110 is determined based on the fourth voltage and the first excitation current.

Specifically, the second measuring electrode 103 may be electrically connected to the first upper limb 110, and the first measuring electrode 102 may be electrically connected to the second upper limb 120. Thus, when the first excitation current is applied, a fourth voltage between the first upper limb 110 and the second upper limb 120 can be measured via the two measuring electrodes. In one embodiment, the fourth voltage may also be measured by other means, as long as it is ensured that the voltage between the first upper limb 110 and the second upper limb 120 is available.

As described above, when the first excitation current is applied, no current flows through both the second upper limb 120 and the first lower limb 140, and no current flows between the shoulder of the second upper limb 120 and the shoulder of the first upper limb 110, so the measurement point of the second upper limb 120 can be equivalent to the shoulder of the first upper limb 110. Therefore, when the first excitation current is applied, the measured fourth voltage between the first upper limb 110 and the second upper limb 120 can be equivalent to the voltage from the measurement point of the first upper limb 110 to the shoulder, i.e., the voltage of the first upper limb 110.

In this embodiment, the fourth voltage is indicative of the voltage between the measurement point of the first upper limb 110 and the junction of the first upper limb 110 and the torso 130. Accordingly, the fourth impedance characterizes a bioelectrical impedance between the measurement point of the first upper limb 110 and the junction of the first upper limb 110 and the torso 130, i.e. a bioelectrical impedance of all or part of the segment of the first upper limb 110. For example, if the measurement point of the first upper limb 110 is palmar electrical (in this case, the first measurement electrode 102 may be electrically connected to any position of the second upper limb 120), the fourth impedance is the bioelectrical impedance of the whole first upper limb 110. If the measurement point of the first upper limb 110 is at the elbow joint, the second impedance is the voltage between the elbow joint and the junction of the first upper limb 110 and the trunk 130.

According to the embodiment, the fourth voltage is measured while the first excitation current is introduced, and the impedance of the first upper limb of the tested object can be accurately measured, so that the trunk impedance of the tested object can be determined, the impedance of the specific limb segment of the tested object can be determined, and the comprehensiveness and the accuracy of the impedance measurement result are improved. In this case, before or after the first impedance is determined, the impedance of the first upper limb of the subject may be determined by adjusting the voltage measurement point without changing the path of the excitation current, so as to improve the overall measurement efficiency. Alternatively, the steps of this embodiment may also be implemented after step S106, and at this time, the impedance measurement of the first upper limb may be performed after the impedance measurement of the trunk is completed, so as to improve the efficiency of the trunk impedance measurement.

In one embodiment, the impedance measuring method further includes: the impedance of the first upper limb 110 is determined from any one of the third impedance and the fourth impedance of the first upper limb 110. Or the impedance of the first upper limb 110 is determined from the average of the third impedance and the fourth impedance of the first upper limb 110. In this embodiment, the impedance of the first upper limb 110 is determined by averaging the third impedance and the fourth impedance, so that the impedance of the first upper limb 110 measured finally is more accurate than the third impedance or the fourth impedance.

In one embodiment, the impedance measuring method further includes: while the second excitation current is applied, a fifth voltage is measured between second upper limb 120 and second lower limb 150, and a fifth impedance of second upper limb 120 is determined based on the fifth voltage and the second excitation current.

Specifically, the first measuring electrode 102 may be electrically connected to the second upper limb 120, and the fourth measuring electrode 108 may be electrically connected to the second lower limb 150. Thus, when the second excitation current is applied, a fifth voltage between the second upper limb 120 and the second lower limb 150 can be measured via the two measuring electrodes. In one embodiment, the fifth voltage may also be measured by other means, as long as it is ensured that the voltage between the second upper limb 120 and the second lower limb 150 is available.

As described above, when the second excitation current is applied, no current flows through second lower limb 150, and thus the measurement point of second lower limb 150 (i.e., the contact point between second lower limb 150 and fourth measurement electrode 108) and the root of the thigh of second lower limb 150 are equipotential points. Meanwhile, since the second excitation current is transmitted along the second diagonal line of the trunk 130, substantially no current flows between the thigh root of the second lower limb 150 and the underarm portion of the second upper limb 120, so that the thigh root of the second lower limb 150 and the underarm portion of the second upper limb 120 are at the same potential point. In other words, the measurement point of the second lower limb 150 may be equivalent to the underarm portion of the second upper limb 120. As can be seen from the above, when the second excitation current is applied, the measured fifth voltage between the second upper limb 120 and the second lower limb 150 can be equivalent to the voltage from the measurement point of the second upper limb 120 to the underarm region, i.e. the voltage of the whole or partial segment of the second upper limb 120.

Thus, in this embodiment, the fifth voltage is indicative of the voltage between the measurement point of the second upper limb 120 and the junction of the second upper limb 120 and the torso. Accordingly, the fifth impedance is the bioelectrical impedance between the measurement point of the second upper limb 120 and the junction of the second upper limb 120 and the torso, i.e. the bioelectrical impedance of the whole or a partial segment of the second upper limb 120. For example, if the measurement point of the second upper limb 120 is the palm (in this case, the fourth measurement electrode 108 may be electrically connected to any position of the second lower limb 150), the fifth impedance is the impedance of the entire second upper limb 120. If the first measuring electrode 102 is electrically connected to the elbow joint of the second upper limb 120, the measured fifth impedance is the impedance between the elbow joint and the junction of the second upper limb 120 and the torso 130.

In the embodiment, the fifth voltage is measured while the second excitation current is introduced, and the impedance of the second upper limb of the tested object can be accurately measured, so that the trunk impedance of the tested object can be determined, the impedance of the specific limb segment of the tested object can be determined, and the comprehensiveness and the accuracy of the impedance measurement result are improved. The step of this embodiment may be implemented before step S104 or after step S104, and before or after determining the second impedance, the impedance of the first upper limb of the subject may be determined in addition by adjusting the voltage measurement point without changing the path of the excitation current, so as to improve the overall measurement efficiency. If the steps of this embodiment are performed after step S106, the impedance measurement of the trunk may be completed first and then the impedance measurement of the first upper limb is performed, so as to improve the efficiency of trunk impedance measurement.

In one embodiment, the impedance measuring method further includes: measuring a sixth voltage between the first upper limb 110 and the second upper limb 120 while the second excitation current is applied; a sixth impedance of the second upper limb 120 is determined based on the sixth voltage and the second excitation current.

Specifically, the second measuring electrode 103 may be electrically connected to the first upper limb 110, and the first measuring electrode 102 may be electrically connected to the second upper limb 120. Thus, when the second excitation current is applied, a sixth voltage between the first upper limb 110 and the second upper limb 120 can be measured via the two measuring electrodes. In one embodiment, the sixth voltage may also be measured by other means, as long as it is ensured that the voltage between the first upper limb 110 and the second upper limb 120 is available.

As mentioned above, when the second excitation current is applied, no current flows through the first upper limb 110, and substantially no current flows between the shoulder of the first upper limb and the shoulder of the second upper limb, so the measurement point of the first upper limb 110 can be equivalent to the shoulder of the second upper limb 120. That is, when the second excitation current is applied, the measured sixth voltage between the first upper limb 110 and the second upper limb 120 can be equivalent to the voltage from the measurement point of the second upper limb 120 to the shoulder, that is, the voltage of the second upper limb 120.

Thus, in this embodiment, the sixth voltage is indicative of the voltage between the measurement point of the second upper limb 120 and the junction of the second upper limb 120 and the torso 130. Accordingly, the sixth impedance is characterized by a bioelectrical impedance between the measurement point of the second upper limb 120 and the junction of the second upper limb 120 and the torso 130, which may be an electrical impedance of the second upper limb 120 at all or part of the extremities. For example, if the measurement point of the second upper limb 120 is the palm (in this case, the second measurement electrode 103 may be electrically connected to any position of the first upper limb 110), the measured sixth voltage is the voltage of the second upper limb 120 as a whole. If the first measuring electrode is electrically connected to the elbow joint of the second upper limb 120, the measured sixth voltage is the voltage between the elbow joint and the junction of the second upper limb 120 and the trunk 130.

When the measurement point of the second upper limb 120 is located at the palm, the sixth voltage approximates the voltage of the second upper limb 120 as a whole. After the sixth voltage is measured, a sixth impedance of the second upper limb 120 can be determined from the sixth voltage and the second excitation current. The sixth voltage measured in the manner described above is closer to the overall voltage drop of the second upper limb 120. Accordingly, the sixth impedance determined based on the sixth voltage and the second excitation current is also closer to the overall impedance of the second upper limb 120, and therefore the accuracy of the impedance measurement of the second upper limb 120 can be improved.

The third excitation current is introduced and the sixth voltage is measured at the same time, so that the impedance of the second upper limb of the tested object can be accurately measured, the trunk impedance of the tested object can be determined, the impedance of the specific limb segment of the tested object can be determined, and the comprehensiveness and the accuracy of the impedance measurement result are improved.

In one embodiment, the method further comprises: a third excitation current is applied and flows through the first upper limb 110 and the second upper limb 120. While the third excitation current is applied, a seventh voltage is measured between the first upper limb 110 and either of the first and second

lower limbs

140, 150. The impedance of the first upper limb 110 is determined based on the seventh voltage and the third excitation current.

At the same time, the impedance measurement method can only be applied with one of the first excitation current, the second excitation current and the third excitation current at most. Specifically, the second measuring electrode 103 may be electrically connected to the first upper limb 110, the third measuring electrode 107 may be electrically connected to the first lower limb 140, or the fourth measuring electrode 108 may be electrically connected to the second lower limb 150. Therefore, when the third excitation current is applied, the seventh voltage between the first upper limb 110 and either one of the first lower limb 140 and the second lower limb 150 can be measured through the two measuring electrodes. In one embodiment, the seventh voltage may also be measured by other means as long as it is ensured that a voltage between the first upper limb 110 and either of the first lower limb 140 and the second lower limb 150 is available.

When the third excitation current is applied, the third excitation current does not flow through the first lower limb 140, the second lower limb 150, and the trunk 130, and therefore the equipotential point of any one of the first lower limb 140 and the second lower limb 150 is located at the connection between the upper limb and the trunk 130. Therefore, the seventh voltage between any lower limb and the first upper limb 110 is equivalent to the voltage at the connection point between the measurement point of the first upper limb 110 and the upper limb 130, which is similar to the voltage of the first upper limb 110.

Thus, in this embodiment, the seventh voltage is indicative of the voltage between the measurement point of the first upper limb 110 and the junction of the upper limb and the torso 130. Accordingly, the impedance determined based on the seventh voltage and the third excitation current is indicative of the bioelectrical impedance between the measurement point of the first upper limb 110 and the connection of the upper limb and the torso 130, i.e. the impedance of the first upper limb 110 as a whole or as a partial segment. For example, if the measurement point of the first upper limb 110 is the palm (in this case, the third measurement electrode 107 may be electrically connected to any position of the first lower limb 140, or the fourth measurement electrode 108 may be electrically connected to any position of the second lower limb 150), the impedance determined based on the seventh voltage and the third excitation current is the impedance of the entire first upper limb 110. If the measurement point of the first upper limb 110 is at the elbow joint, the impedance determined based on the seventh voltage and the third excitation current is the bioelectrical impedance between the elbow joint and the junction of the first upper limb and the torso 130.

In one embodiment, the magnitude of the third driving current may be the same as or different from the first driving current. Specifically, the magnitude of the third excitation current may be selected according to at least one physiological parameter of the subject 11, such as weight, height, age, and sex, and is not limited to a specific value.

The third excitation current is introduced and the seventh voltage is measured at the same time, so that the impedance of the first upper limb of the tested object can be accurately measured, the trunk impedance of the tested object can be determined, the impedance of the specific limb segment of the tested object can be determined, and the comprehensiveness and the accuracy of the impedance measurement result are improved.

In one embodiment, the impedance measuring method further includes: while the third excitation current is applied, an eighth voltage is measured between the second upper limb 120 and either of the first and second

lower limbs

140, 150. An impedance of the second upper limb 120 is determined based on the eighth voltage and the third excitation current.

Specifically, the first measuring electrode 102 may be electrically connected to the second upper limb 120, the third measuring electrode 107 may be electrically connected to the first lower limb 140, or the fourth measuring electrode 108 may be electrically connected to the second lower limb 150. Therefore, when the third excitation current is applied, the eighth voltage between the second upper limb 120 and any one of the first lower limb 140 and the second lower limb 150 can be measured through the two measuring electrodes. In one embodiment, the eighth voltage may be measured in other ways as long as it is ensured that a voltage between the second upper limb 120 and either of the first lower limb 140 and the second lower limb 150 is available.

As described above, when the third excitation current is applied, the third excitation current flows through and does not flow through the first lower limb 140, the second lower limb 150, and the trunk 130, and thus the equipotential point of any one of the first lower limb 140 and the second lower limb 150 is located at the connection between the upper limb and the trunk 130. Therefore, the eighth voltage between any lower limb and the second upper limb 120 can be equivalent to the voltage from the measurement point of the second upper limb 120 to the connection point, i.e. the voltage of the second upper limb 120.

Thus, in this embodiment, the eighth voltage is indicative of the voltage between the measurement point of the second upper limb 120 and the junction of the upper limb and the torso 130. Accordingly, the impedance determined based on the eighth voltage is indicative of the bioelectrical impedance between the measurement point of the second upper limb 120 and the connection of the upper limb to the torso 130. For example, if the measurement point of the second upper limb 120 is the palm (in this case, the third measurement electrode 107 may be electrically connected to any position of the first lower limb 140, or the fourth measurement electrode 108 may be electrically connected to any position of the second lower limb 150), the determined impedance is the impedance of the second upper limb 120 as a whole. If the measurement point of the second upper limb 120 is the elbow joint, the impedance determined is the impedance between the elbow joint and the junction of the upper limb and the torso 130.

The third excitation current is introduced and the eighth voltage is measured at the same time, so that the impedance of the second upper limb of the tested object can be accurately measured, the trunk impedance of the tested object can be determined, the impedance of the specific limb segment of the tested object can be determined, and the comprehensiveness and the accuracy of the impedance measurement result are improved.

In one embodiment, the impedance measuring method further includes: a fourth excitation current is introduced, and the fourth excitation current flows through the first lower limb 140 and the second lower limb 150; measuring a ninth voltage between either of the first upper limb 110 and the second upper limb 120 and the first lower limb 140 while the fourth excitation current is applied; based on the ninth voltage and the fourth excitation current, the impedance of the first lower limb 140 is determined. At the same time, the impedance measurement method can only supply one of the first excitation current, the second excitation current, the third excitation current and the fourth excitation current at most.

Specifically, the third measuring electrode 107 may be electrically connected to the first lower limb 140, the first measuring electrode 102 may be electrically connected to the second upper limb 120, or the first measuring electrode 103 may be electrically connected to the first upper limb 110. Therefore, when the fourth excitation current is applied, the ninth voltage between the first lower limb 140 and either one of the first upper limb 110 and the second upper limb 120 can be measured through the two measuring electrodes. In one embodiment, the ninth voltage may be measured by other means as long as it is ensured that a voltage between the first lower limb 140 and either of the first upper limb 110 and the second upper limb 120 is available.

When the fourth excitation current is applied, the fourth excitation current flows through the first lower limb 140 and the second lower limb 150, and does not flow through the first upper limb 110, the second upper limb 120, and the trunk 130, so that the equipotential point of any one of the first upper limb 110 and the second upper limb 120 is at the groin. The ninth voltage between any upper limb and the first lower limb 140 can be equivalent to the voltage from the measurement point of the first lower limb 140 to the groin, i.e. the voltage of the first lower limb 140.

Thus, in this embodiment, the ninth voltage is indicative of the voltage between the inguinal and the junction of the third measurement electrode 107 with the first lower limb 140. Accordingly, the impedance determined based on the fourth excitation current and the ninth voltage is the bioelectrical impedance between the measurement point of the first lower limb 140 and the groin. For example, if the measurement point of the first lower limb 140 is the sole of a foot (in this case, the first measurement electrode 102 may be electrically connected to any position of the second upper limb 120, or the second measurement electrode 103 may be electrically connected to any position of the first upper limb 110), the determined impedance is the overall impedance of the first lower limb. If the measurement point of the first lower limb 140 is at the knee joint, the determined impedance of the knee joint of the first lower limb 140 is the impedance to the junction of the first lower limb 140 and the torso 130.

After the ninth voltage is measured, the impedance of the first lower limb 140 can be determined from the ninth voltage and the fourth excitation current. The ninth voltage measured in the manner described above is closer to the overall voltage drop of the first lower limb 140. Accordingly, the impedance determined based on the ninth voltage and the fourth excitation current is also closer to the overall impedance of the first lower limb 140, thus improving the accuracy of the impedance measurement of the first lower limb 140.

In one embodiment, the magnitude of the fourth driving current may be the same as or different from the first driving current. Specifically, the magnitude of the fourth excitation current may be selected according to at least one physiological parameter of the subject 11, such as weight, height, age, and sex, and is not limited to a specific value.

The fourth exciting current is introduced and the ninth voltage is measured at the same time, so that the impedance of the first lower limb of the tested object can be accurately measured, the trunk impedance of the tested object can be determined, the impedance of the specific limb segment of the tested object can be determined, and the comprehensiveness and the accuracy of the impedance measurement result are improved.

In one embodiment, the impedance measuring method further includes: measuring a tenth voltage between the second lower limb 150 and any one of the first upper limb 110 and the second upper limb 120 while the fourth excitation current is applied; based on the tenth voltage and the fourth excitation current, an impedance of the second lower limb 150 is determined.

Specifically, the fourth measurement electrode 108 may be electrically connected to the second lower limb 150, the first measurement electrode 102 may be electrically connected to the second upper limb 120, or the first measurement electrode 103 may be electrically connected to the first upper limb 110. Therefore, when the fourth excitation current is applied, the tenth voltage between the second lower limb 150 and any one of the first upper limb 110 and the second upper limb 120 can be measured through the two measuring electrodes. In one embodiment, the tenth voltage may be measured by other means as long as it is ensured that a voltage between either of the first upper limb 110 and the second upper limb 120 and the second lower limb 150 is available.

Similar to the ninth voltage described above, in this embodiment, the tenth voltage represents the voltage between the measurement point of the second lower limb 150 (i.e., the junction of the fourth measurement electrode 108 and the second lower limb 150) and the groin. Accordingly, the impedance determined based on the tenth voltage and the fourth excitation current is not the bioelectrical impedance between the measurement point of the second lower limb 150 and the groin, i.e., the impedance of the second lower limb 150. Wherein the impedance of second lower limb 150 may be the overall impedance or a partial segment of the impedance of second lower limb 150. For example, if the measurement point of second lower limb 150 is the sole of a foot, the determined impedance is the impedance of second lower limb 150 as a whole. If the measurement point of the second lower limb 150 is at the knee joint, the determined impedance is the bioelectrical impedance between the knee joint of the second lower limb and the junction of the second lower limb 150 and the torso 130.

In the embodiment, the impedance of the second lower limb of the subject can be accurately measured by applying the fourth exciting current to the subject and measuring the tenth voltage, so that not only the trunk impedance of the subject but also the impedance of a specific limb segment of the subject can be determined, and the comprehensiveness and accuracy of the impedance measurement result are improved.

In one embodiment, the impedance measuring method may further include: passing a fifth excitation current to the subject 11, and causing the fifth excitation current to flow through the first upper limb 110 and the first lower limb 140; measuring an eleventh voltage between the first lower limb 140 and the second lower limb 150 while the fifth excitation current is applied, and determining an impedance of the first lower limb 140 based on the eleventh voltage and the fifth excitation current; while the fifth excitation current is being applied, a twelfth voltage is measured between the first upper limb 110 and the second upper limb 120, and the impedance of the first upper limb 110 is determined based on the twelfth voltage and the fifth excitation current. In the embodiment, the fifth excitation current is introduced, the eleventh voltage and the twelfth voltage are measured simultaneously, and the impedance of the first upper limb and the impedance of the second lower limb of the tested object can be accurately measured, so that the trunk impedance of the tested object can be determined, the impedance of a specific limb segment of the tested object can be determined, and the comprehensiveness and the accuracy of the impedance measurement result are improved.

In one embodiment, the impedance measuring method may further include: a sixth excitation current is introduced into the subject 11, and flows through the second upper limb 120 and the second lower limb 150; measuring a thirteenth voltage between the first lower limb 140 and the second lower limb 150 while the sixth excitation current is applied, and determining an impedance of the second lower limb 150 based on the thirteenth voltage and the sixth excitation current; while the sixth excitation current is applied, a fourteenth voltage between the first upper limb 110 and the second upper limb 120 is measured, and the impedance of the second upper limb 120 is determined based on the fourteenth voltage and the sixth excitation current. In the embodiment, the sixth excitation current is introduced and the thirteenth voltage and the fourteenth voltage are measured at the same time, so that the impedance of the second upper limb and the second lower limb of the tested object can be accurately measured, the trunk impedance of the tested object can be determined, the impedance of a specific limb segment of the tested object can be determined, and the comprehensiveness and the accuracy of the impedance measurement result are improved.

In one embodiment, after step S106, the impedance measuring method further includes: judging whether the impedance measurement of the trunk 130 is completed within a preset time; if the impedance measurement on the trunk 130 is not completed within the preset time, the trunk is withdrawn overtime, and the test subject 11 is prompted to finish the measurement; if the impedance measurement of trunk 130 is completed within a predetermined time, subject 11 is notified that the impedance measurement is completed. In one embodiment, the preset time can be set according to actual requirements. For example, the preset time may be set to 20 s. In one embodiment, if the impedance measurement of torso 130 is not completed within a predetermined time, the subject may be prompted by voice or video images that the measurement is not completed. Similarly, if the impedance measurement of the trunk 130 is completed within the predetermined time, the subject may be prompted by voice or video images that the impedance measurement is completed.

In one embodiment, before step S101, the impedance measuring method further includes: the measurement stability of the subject 11 is detected, and it is determined whether the measurement stability meets a preset stability condition. When the measured stability meets the preset stability condition, step S101 is executed.

In one embodiment, detecting the stability of the measurement of subject 11 and determining whether the stability of the measurement meets a predetermined stability condition refers to: the weight of the subject 11 is acquired, and it is determined whether the amount of change in the weight of the subject 11 in a preset time is within a preset range. If the variation is within the preset range, it is determined that the measured stability of the subject 11 meets the preset stability condition. If the variation is not within the preset range, determining that the measurement stability of the subject 11 does not meet the preset stability condition, and at this time, re-executing the steps of obtaining the weight of the subject and determining whether the variation of the weight of the subject within the preset time is within the preset range.

In one embodiment, the weight of subject 11 may be detected and obtained by a load cell. After the weight of the subject 11 is acquired, whether the amount of change of the weight of the subject 11 in a preset time is within a preset range may be determined by an MCU (micro control unit). Specifically, the MCU may compare the variation with a preset threshold within a preset time. If the variation is larger than the preset threshold, it is determined that the measurement stability of the subject 11 does not meet the preset stability condition, and the weight of the subject 11 is obtained again. If the variation is smaller than or equal to the preset threshold, it is determined that the measurement stability of the subject 11 meets the preset stability condition, and step S102 may be executed.

In one embodiment, the specific time of the preset time can be set according to actual requirements, for example: the preset time may be set to 1s or 2 s. In one embodiment, the preset threshold may also be set according to actual requirements, for example: the preset threshold may be set to 1 kg.

Referring to fig. 3, another embodiment of the present application provides an impedance measuring apparatus 10, including: a first excitation electrode 101, a first measurement electrode 102, a second measurement electrode 103, a second excitation electrode 104, a third excitation electrode 105, a fourth excitation electrode 106, a third measurement electrode 107, a fourth measurement electrode 108, and a control module 100. The first excitation electrode 101 and the first measurement electrode 102 are each for electrical connection with a second upper limb 120 of the subject 11. The second measuring electrode 103 and the second excitation electrode 104 are each for electrical connection with a first upper limb 110 of the subject 11. The third excitation electrode 105 and the third measurement electrode 107 are for electrical connection with a first lower limb 140 of the subject 11.

Fourth excitation electrode 106 and fourth measurement electrode 108 are adapted to be electrically connected to a second lower limb 150 of subject 11. The control module 100 is electrically connected to a first excitation electrode 101, a first measurement electrode 102, a second measurement electrode 103, a second excitation electrode 104, a third excitation electrode 105, a fourth excitation electrode 106, a third measurement electrode 107 and a fourth measurement electrode 108, respectively. The control module 100 is configured to perform the impedance measuring method of any of the above embodiments.

In one embodiment, the impedance measuring device 10 may be a body fat scale or body composition analyzer. In one embodiment, the control module 100 may be an MCU (micro processing unit). The control module 100 may also be a controller or an integrated control chip. In one embodiment, the structures of first excitation electrode 101, first measurement electrode 102, second measurement electrode 103, second excitation electrode 104, third excitation electrode 105, fourth excitation electrode 106, third measurement electrode 107, and fourth measurement electrode 108 are not limited to electrode pads, and other structures (e.g., needle structures, etc.) may be employed.

In one embodiment, the impedance measuring device 10 is in use, as shown in fig. 4, the second measuring electrode 103 and the second excitation electrode 104 are in contact electrical connection with the first upper limb 110 of the subject 11. Specifically, the second measuring electrode 103 may be electrically connected to the thumb of the palm of the first upper limb 110, and the second excitation electrode 104 may be electrically connected to the center of the palm of the first upper limb 110. The first excitation electrode 101 and the first measurement electrode 102 are electrically connected in contact with a second upper limb 120 of the subject 11. Specifically, the first measuring electrode 102 may be electrically connected to the thumb of the palm of the second upper limb 120, and the first excitation electrode 101 may be electrically connected to the center of the palm of the first upper limb 110.

In one embodiment, the third excitation electrode 105 and the third measurement electrode 107 are electrically connected in contact with a first lower limb 140 of the subject 11. Specifically, third excitation electrode 105 may be electrically connected to the forefoot of first limb 140, and third measurement electrode 107 may be electrically connected to the rearfoot of first limb 140. Fourth excitation electrode 106 and fourth measurement electrode 108 are electrically connected in contact with a second lower limb 150 of subject 11. Specifically, fourth excitation electrode 106 may be electrically coupled to a forefoot of second lower limb 150, and fourth measurement electrode 108 may be electrically coupled to a rearfoot of second lower limb 150.

Then, by executing the impedance measuring method of any one of the above embodiments by the control module 100, the impedance of each segment of the subject 11 can be determined. The impedance measuring apparatus 10 of the present embodiment can improve the measurement accuracy of the impedance of each segment by using the impedance measuring method of any one of the above embodiments.

Referring to fig. 6, in one embodiment, the impedance measuring apparatus 10 is a body composition analyzer or an electronic scale, and the body composition analyzer or the electronic scale further includes: a handle 200 and a base 300. The first excitation electrode 101, the first measurement electrode 102, the second measurement electrode 103, and the second excitation electrode 104 are all disposed on the handpiece 200. The third excitation electrode 105, the fourth excitation electrode 106, the third measurement electrode 107, and the fourth measurement electrode 108 are disposed on the base 300. In one embodiment, the control module 100 is disposed within the handle 200 or the base 300.

In one embodiment, the first excitation electrode 101, the first measuring electrode 102, the second measuring electrode 103 and the second excitation electrode 104 are all disposed on the handle 200, and when the subject 11 needs to be detected, each electrode on the handle 200 is directly electrically connected to two corresponding upper limbs of the subject 11. Similarly, the third excitation electrode 105, the fourth excitation electrode 106, the third measurement electrode 107 and the fourth measurement electrode 108 are all disposed on the base 300, and when the subject 11 needs to be detected, the electrodes on the base 300 may be directly and electrically connected to the two lower limbs of the subject 11 in a corresponding contact manner. The connection between the electrodes on the handle 200 and the base 300 and the subject 11 can be achieved by the above-mentioned embodiments, and the detailed description is omitted here.

Referring to fig. 7, in one embodiment, the body composition analyzer further includes: a detection module 400. The detection module 400 is electrically connected to the control module 100. The detecting module 400 is configured to obtain the weight of the subject 11, and determine whether a variation of the weight of the subject 11 in a preset time is within a preset range. If the variation is within the preset range, it is determined that the measured stability of the subject 11 meets the preset stability condition. If the variation is not within the preset range, it is determined that the measurement stability of the subject 11 does not meet the preset stability condition, and the weight of the subject 11 is retrieved at this time.

In one embodiment, the detection module 400 may be the load cell 109 and an MCU electrically connected to the load cell 109. Wherein the load cell 109 may be disposed at the base 300. Specifically, the MCU determines whether the variation of the weight of the subject 11 in a preset time is within a preset range by the weight of the subject 11 measured by the weighing sensor 109. The MCU may compare the variation with a preset threshold for a preset time. If the variation is larger than the preset threshold, it is determined that the measurement stability of the subject 11 does not meet the preset stability condition, and the weight of the subject 11 is obtained again by the weighing sensor 109. If the variation is smaller than or equal to a preset threshold, it is determined that the measurement stability of the subject 11 meets a preset stability condition. That is, the measurement stability of the subject 11 meets the preset stability condition, the impedance measurement method according to any one of the above embodiments may be executed by the control module 100.

In one embodiment, the impedance measurement device 10 further comprises: the module 500 is triggered. The control module 300 receives the impedance measurement command through the trigger module 500. In one embodiment, the trigger module 500 may be a cell phone APP or a wechat applet. When the impedance measuring apparatus 10 is in use, the subject 11 may issue an impedance measurement command to the impedance measuring apparatus 10 through the mobile phone APP or the WeChat applet, so that the control module 300 receives the impedance measurement command and executes the impedance measurement method according to any one of the above embodiments in response to the impedance measurement command.

In one embodiment, the impedance measurement device 10 further comprises: a module 600 is displayed. The display module 600 is electrically connected to the control module 300. The display module 600 is used for displaying the measurement result. In one embodiment, the display module 600 may be a display screen. The impedance measuring apparatus 10 may display the measurement result and prompt the subject 11 of the current measurement process through the display module 600.

In one embodiment, the impedance measurement device 10 further comprises: a power module 700. The power module 700 is electrically connected to the control module 300. In one embodiment, the power module 700 may be a battery. The power module 700 may also be a disposable dry cell battery. The impedance measuring device 10 is powered up by the power module 700.

In summary, the measurement method for directly measuring impedance in the above embodiment is adopted, the left and right upper limbs and the left and right lower limbs are averaged in different combination manners, and the trunk 130 impedance is averaged in a cross measurement manner, so that the accuracy of impedance measurement of each segment is greatly improved, and the competitiveness and user experience of the product in the industry are improved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An impedance measurement method for measuring impedance of a body of a subject, the subject including a first upper limb, a second upper limb, a torso, a first lower limb, and a second lower limb, the first upper limb and the first lower limb being ipsilateral to the torso, the second upper limb and the second lower limb being ipsilateral to the torso, the impedance measurement method comprising:

2. The impedance measurement method of claim 1, further comprising, after measuring a first voltage between the second upper limb and the first lower limb while passing the first excitation current:

cutting off the first excitation current and introducing a second excitation current, and enabling the second excitation current to flow through the second upper limb, the trunk and the first lower limb;

measuring a second voltage between the first upper limb and the second lower limb when the second excitation current is switched on;

determining a second impedance of the torso based on the second voltage and the second excitation current.

3. The impedance measurement method of claim 2, further comprising:

determining an impedance of the torso from either one of the first and second impedances, or from an average of the first and second impedances.

4. The impedance measurement method of any one of claims 1-3, wherein the method further comprises:

while the first excitation current is applied, a third voltage between the first upper limb and the first lower limb is measured, and a third impedance of the first upper limb is determined based on the third voltage and the first excitation current.

5. The impedance measurement method of claim 4, wherein the method further comprises:

measuring a fourth voltage between the first upper limb and the second upper limb when the first excitation current is switched on;

determining a fourth impedance of the first upper limb based on the fourth voltage and the first excitation current.

6. The impedance measurement method of claim 5, further comprising:

determining an impedance of the first upper limb from either one of the third impedance and the fourth impedance, or from an average of the third impedance and the fourth impedance.

7. The impedance measurement method of any one of claims 1-3, wherein the method further comprises:

measuring a fifth voltage between the second upper limb and the second lower limb while the second excitation current is energized, and determining a fifth impedance of the second upper limb based on the fifth voltage and the second excitation current.

8. The impedance measurement method of claim 7, further comprising:

measuring a sixth voltage between the first upper limb and the second upper limb when the second excitation current is switched on;

determining a sixth impedance of the second upper limb based on the sixth voltage and the second excitation current.

9. The impedance measurement method of claim 8, wherein the method further comprises:

determining an impedance of the second upper limb from either one of the fifth impedance and the sixth impedance, or from an average of the fifth impedance and the sixth impedance.

10. The impedance measurement method of any one of claims 1-3, wherein the method further comprises:

a third excitation current is introduced, and the third excitation current flows through the first upper limb and the second upper limb;

measuring a seventh voltage between the first upper limb and any one of the first lower limb and the second lower limb when the third excitation current is switched on;

determining an impedance of the first upper limb based on the seventh voltage and the third excitation current.

11. The impedance measurement method of claim 10, wherein the method further comprises:

measuring an eighth voltage between the second upper limb and any one of the first lower limb and the second lower limb when the third excitation current is switched on;

determining an impedance of the second upper limb based on the eighth voltage and the third excitation current.

12. The impedance measurement method of any one of claims 1-3, wherein the method further comprises:

a fourth excitation current is introduced, and the fourth excitation current flows through the first lower limb and the second lower limb;

measuring a ninth voltage between either one of the first upper limb and the second upper limb and the first lower limb while the fourth excitation current is applied;

determining an impedance of the first lower limb based on the ninth voltage and the fourth excitation current.

13. The impedance measurement method of claim 12, wherein the method further comprises:

measuring a tenth voltage between the second lower limb and either one of the first upper limb and the second upper limb while the fourth excitation current is applied;

determining an impedance of the second lower limb based on the tenth voltage and the fourth excitation current.

14. The impedance measurement method of any one of claims 1-3, wherein prior to the step of passing a first excitation current and flowing the first excitation current through the first upper limb, the torso, and the second lower limb, the method further comprises:

detecting the measurement stability of the subject and determining whether the measurement stability meets a preset stability condition;

and when the measurement stability meets the preset stability condition, the step of introducing a first excitation current and enabling the first excitation current to flow through the first upper limb, the trunk and the second lower limb is executed.

15. The impedance measurement method of claim 14, wherein the step of detecting the stability of the measurement of the subject and determining whether the stability of the measurement meets a predetermined stability condition comprises:

acquiring the weight of the tested object, and judging whether the variation of the weight of the tested object in a preset time is in a preset range;

if the variation is within the preset range, determining that the measurement stability of the tested object meets the preset stability condition;

and if the variation is not in the preset range, determining that the measurement stability of the tested object does not meet the preset stability condition, and at the moment, re-executing the steps of obtaining the weight of the tested object and judging whether the variation of the weight of the tested object in the preset time is in the preset range.

16. An impedance measurement device, comprising: the device comprises a first excitation electrode (101), a first measuring electrode (102), a second measuring electrode (103), a second excitation electrode (104), a third excitation electrode (105), a fourth excitation electrode (106), a third measuring electrode (107), a fourth measuring electrode (108) and a control module (100);

the first excitation electrode (101) and the first measuring electrode (102) are respectively used for being electrically connected with a first upper limb of a subject, the second measuring electrode (103) and the second excitation electrode (104) are respectively used for being electrically connected with a second upper limb of the subject, the third excitation electrode (105) and the fourth excitation electrode (106) are used for being electrically connected with a first lower limb of the subject, and the third measuring electrode (107) and the fourth measuring electrode (108) are used for being electrically connected with a second lower limb of the subject;

the control module (100) is electrically connected with the first excitation electrode (101), the first measurement electrode (102), the second measurement electrode (103), the second excitation electrode (104), the third excitation electrode (105), the fourth excitation electrode (106), the third measurement electrode (107) and the fourth measurement electrode (108), respectively, the control module (100) being configured to perform the impedance measurement method according to any one of claims 1 to 15.

17. The impedance measurement device of claim 16, wherein the impedance measurement device is a body composition analyzer or an electronic scale, the body composition analyzer or electronic scale further comprising: a handle (200) and a base (300);

the first excitation electrode (101), the first measurement electrode (102), the second measurement electrode (103) and the second excitation electrode (104) are all disposed on the handle (200), the third excitation electrode (105), the fourth excitation electrode (106), the third measurement electrode (107) and the fourth measurement electrode (108) are all disposed on the base (300), and the control module (100) is disposed in the handle (200) or the base (300).

18. The impedance measurement device of claim 17, wherein the body composition analyzer or the electronic scale further comprises:

and the detection module (400) is electrically connected with the control module (100) and is used for acquiring the weight of the subject and judging whether the variation of the weight of the subject in a preset time is within a preset range, if so, determining that the measurement stability of the subject meets the preset stability condition, and if not, determining that the measurement stability of the subject does not meet the preset stability condition, and at the moment, acquiring the weight of the subject again.