CN115825158A - Method for measuring hydrogel impedance - Google Patents
Method for measuring hydrogel impedance Download PDFInfo
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- CN115825158A CN115825158A CN202111086787.4A CN202111086787A CN115825158A CN 115825158 A CN115825158 A CN 115825158A CN 202111086787 A CN202111086787 A CN 202111086787A CN 115825158 A CN115825158 A CN 115825158A
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Abstract
The invention provides a method for measuring hydrogel impedance, which comprises the following steps: supplying power to an electrotherapy signal generator through a power supply so that the electrotherapy signal generator outputs an electrical stimulation signal with preset electrical stimulation parameters, and acquiring power supply average current values respectively corresponding to the output end of the electrotherapy signal generator when the output end of the electrotherapy signal generator is connected with different impedance loads so as to obtain a data table; supplying power to the electrotherapy signal generator through the power supply so as to output an electrostimulation signal with the preset electrostimulation parameter, acquiring the average current value of the power supply when the output end of the electrotherapy signal generator is connected with a component to be tested containing hydrogel to be tested, and recording the average current value as a comparison value; and inquiring the data table, and if the power supply average current value data equal to the comparison value exists in the data table, taking the load impedance value corresponding to the power supply average current value data as the measured impedance value of the hydrogel to be measured. The device can measure the impedance of the hydrogel in a real state, and the measurement result is more accurate.
Description
Technical Field
The invention belongs to the field of hydrogel, particularly relates to the field of wearable conductive hydrogel, and relates to a method for measuring hydrogel impedance.
Background
Many wearable medical devices require the use of hydrogels, which on the one hand can be adhered to the skin, so that the wearable device can be applied to the skin surface of a human body, and on the other hand, the hydrogels can have conductive properties, and can be used for transmitting electrical signals (e.g., electrotherapy), or collecting bioelectric signals (e.g., electrocardiogram, electromyogram).
For electrotherapy, it is a method of treating diseases by outputting electrical stimulation pulses to human body to make human body generate electrochemical and/or electrophysiological reactions. There is a conductive hydrogel on an electrode sheet of an electrotherapy apparatus, which typically has a structure including a base material, a conductive metal layer, and a conductive hydrogel layer, which are sequentially laminated.
Since hydrogels are required to transmit electrical stimulation energy, there are design requirements for their electrical conductivity properties, particularly impedance, and it is generally desirable that the smaller the impedance of the hydrogel, the better, and thus the less the transmission loss of electrical stimulation energy across the hydrogel.
However, how to measure the impedance of the hydrogel is a difficult problem because:
1) The hydrogel is a film, and if the size of a probe for measurement is small (such as a common multimeter probe), the probe is difficult to contact sufficiently, and the measurement is inaccurate; and if the size of the probe is large (such as a plane type), the probe is difficult to represent the application condition in the actual product. The hydrogel impedance presents certain directionality, and the placement positions of the anode and the cathode of the probe are different, so that the measurement results are different.
2) The impedance measurement requires an excitation signal, and a common signal source (such as a signal generator) is difficult to simulate an electric stimulation signal generated by electrotherapy.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a method for measuring hydrogel impedance, which is used for solving the problems that the existing hydrogel impedance measuring method is inaccurate in measurement and a signal source is difficult to simulate an electrical stimulation signal generated by electrotherapy.
To achieve the above and other related objects, the present invention provides a method for measuring impedance of hydrogel, comprising the steps of:
supplying power to an electrotherapy signal generator through a power supply so that the electrotherapy signal generator outputs an electrical stimulation signal with preset electrical stimulation parameters, and acquiring power supply average current values respectively corresponding to the output end of the electrotherapy signal generator when the output end of the electrotherapy signal generator is connected with different impedance loads so as to obtain a data table;
supplying power to the electrotherapy signal generator through the power supply so that the electrotherapy signal generator outputs an electrostimulation signal with the preset electrostimulation parameter, acquiring the average current value of the power supply when the output end of the electrotherapy signal generator is connected with a component to be tested containing hydrogel to be tested, and recording the average current value as a comparison value;
and inquiring the data table, and if the power supply average current value data equal to the comparison value exists in the data table, taking the load impedance value corresponding to the power supply average current value data as the measured impedance value of the hydrogel to be measured.
Optionally, if the power supply average current value data equal to the comparison value does not exist in the data table, taking the load impedance value corresponding to the power supply average current value data closest to the comparison value in the data table as the measured impedance value of the hydrogel to be measured.
Optionally, when the different impedance loads are sequentially arranged according to the impedance values, the impedance difference between any two adjacent loads is equal.
Optionally, the impedance difference between adjacent loads is no greater than 100 Ω.
Optionally, the load comprises a pure resistance.
Optionally, the subassembly that awaits measuring that contains the aquogel that awaits measuring still includes the electrode slice, the electrode slice includes positive plate and the negative pole piece that the interval set up, the positive terminal and the negative terminal of interval setting, the substrate includes relative first surface and the second surface that sets up, the positive plate with the negative pole piece is located the substrate the first surface, the positive terminal with the negative terminal is located the substrate the second surface, just the positive terminal with the positive plate electricity is connected, the negative terminal with the negative pole piece electricity is connected, the aquogel that awaits measuring stridees across the positive plate with region between the negative pole piece and with the positive plate reaches the negative pole piece electricity is connected.
Optionally, the power supply includes a display module for displaying the power supply average current value, or the power supply average current value is acquired by an oscilloscope.
Optionally, the frequency of the electrical stimulation signal is greater than 5Hz.
Optionally, the output voltage of the power supply is adjustable.
Optionally, the output voltage, output frequency, and output pulse width of the electrotherapy signal generator are adjustable.
As described above, the method for measuring hydrogel impedance of the present invention employs a power supply to supply power to an electrotherapy signal generator so that the electrotherapy signal generator outputs an electrostimulation signal with preset electrostimulation parameters, obtains a data table by obtaining power supply average current values respectively corresponding to when the output end of the electrotherapy signal generator is connected with different impedance loads, and records a comparison value by obtaining power supply average current values when the output end of the electrotherapy signal generator is connected with a to-be-measured component containing hydrogel to be measured; and then, by inquiring the data table, if the power supply average current value data equal to the comparison value exists in the data table, taking the load impedance value corresponding to the power supply average current value data as the measured impedance value of the hydrogel to be measured. The method can measure the impedance of the hydrogel in a real state, namely the shape of the hydrogel conforms to the actual product condition (non-cutting sample), and the electrical stimulation signal on the hydrogel conforms to the actual product condition (non-universal meter or common signal source), so that the measured impedance of the hydrogel is more accurate. In addition, the method of measuring hydrogel impedance of the present invention can also be used to measure a cut hydrogel sample.
Drawings
FIG. 1 is a flow chart showing a method for measuring hydrogel impedance according to the present invention.
FIG. 2 is a schematic diagram of a device under test including a hydrogel under test.
Description of the element reference numerals
S1 to S3
1. Hydrogel to be tested
2. Substrate
201. First surface
202. Second surface
3. Positive plate
4. Negative plate
5. Positive terminal
6. Negative terminal
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Please refer to fig. 1-2. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
The present invention provides a method for measuring hydrogel impedance, referring to fig. 1, which is a flow chart of the method, comprising the following steps:
s1: supplying power to an electrotherapy signal generator through a power supply so that the electrotherapy signal generator outputs an electrical stimulation signal with preset electrical stimulation parameters, and acquiring power supply average current values respectively corresponding to the output end of the electrotherapy signal generator when the output end of the electrotherapy signal generator is connected with different impedance loads so as to obtain a data table;
s2: supplying power to the electrotherapy signal generator through the power supply so that the electrotherapy signal generator outputs an electrostimulation signal with the preset electrostimulation parameter, acquiring the average current value of the power supply when the output end of the electrotherapy signal generator is connected with a component to be tested containing hydrogel to be tested, and recording the average current value as a comparison value;
s3: and querying the data table, and if the average current value data of the power supply equal to the comparison value exists in the data table, taking the load impedance value corresponding to the average current value data of the power supply as the measured impedance value of the hydrogel to be measured.
Specifically, the principle of the method for measuring the impedance of the conductive hydrogel of the present invention is as follows: for an electrical stimulation signal, the power consumption (average current) of the power supply is determined by the load, with the same parameter settings (e.g., voltage, current, frequency, pulse width, switching ratio, etc.). Generally, the heavier the load (the smaller the impedance), the greater the power consumption; the lighter the load (the greater the impedance), the less power consumption. Therefore, a series of loads (such as resistance) with known impedance can be measured, the relationship between the load and the power consumption of the power supply can be obtained, and the test results of the load and the power consumption of the power supply can be recorded to form a data table, for example, the average current of 2.0mA of the power supply corresponds to 500 Ω load, and the average current of 1.0mA of the power supply corresponds to 1000 Ω load. Then, the hydrogel or electrode sheet to be measured (for measuring the real condition, the hydrogel is usually pasted on the electrode sheet) is used as a load, and under a specific electric stimulation signal, the power consumption (average current) of the power supply is checked. And then, the corresponding impedance can be obtained through the test data table, for example, through the test, the power consumption of the power supply is also 2.0mA average current, and through the table look-up, the impedance of the hydrogel of the electrode plate is considered to be 500 omega.
As an example, the method for measuring the impedance of the conductive hydrogel of the invention can include a power supply, an electrotherapy signal generator, a series of pure resistors with known impedance, the hydrogel to be measured, some leads, connectors (such as clips) and other accessories, an oscilloscope, wherein the adopted power supply requires that the output voltage can be adjusted and has the maximum current limit value, the actual output voltage and current can be checked, and the checked output current is the output current after being averaged; the electrotherapy signal generator employed is used to output an electrical stimulation signal, and requires that the desired parameters of the electrical stimulation signal be adjusted, typically including parameters such as output voltage, frequency, pulse width, etc. Because the electric stimulation signal voltage required by electrotherapy is high (the maximum voltage can reach 80-120V), and the pulse width is short (1 ms or less), a high-voltage signal generator can be adopted. For electrotherapy manufacturers, self-made electrotherapy equipment can also be used as a signal generator to directly output an electrical stimulation signal. The electrotherapy signal generator is powered by the power supply. The pure resistances used in a series of known impedances, such as 0 Ω, 50 Ω,100 Ω, 150 Ω, 200 Ω, 250 Ω \8230, 8230et al, are required to withstand the high voltages and powers used for electrotherapy, with smaller differences between the different resistances and finer measurements. The hydrogel to be tested is usually connected to the electrode sheet.
By way of example, the power supply may include a display module for displaying the average current value of the power supply, in which case an oscilloscope is not necessary. In other embodiments, the power supply average current value may also be obtained by an oscilloscope when the power supply is not capable of displaying the power supply average current value.
As an example, in the step S1, power is supplied to an electrotherapy signal generator through a power supply so that the electrotherapy signal generator outputs an electrical stimulation signal with preset electrical stimulation parameters, and power supply average current values respectively corresponding to output ends of the electrotherapy signal generator when the output ends of the electrotherapy signal generator are connected to different impedance loads are obtained to obtain a data table, which includes the following specific steps:
s1-1: the power supply is connected with the electrotherapy signal generator, and the output characteristic of the power supply is adjusted to meet the requirement of the electrotherapy signal generator.
S1-2: the electrotherapy signal generator is adjusted to be able to output an actual electrical stimulation signal, for example, 10hz,80v, unipolar pulse, pulse width 500 μ s. Where the electrical stimulation signal frequency is not recommended to be too low, which may cause the power supply average current reading to jump, electrical stimulation signal frequencies greater than 5Hz are generally recommended.
S1-3: providing resistors with different resistance values as loads, connecting one of the loads to the electrotherapy signal generator, checking the average current of the power supply at the moment, recording the average current, and then testing other resistors one by adopting the same method.
S1-4: the final table of "electrical stimulation parameters-known load-power consumption" is obtained, and the table style is as follows (for example only):
as an example, in step S2, the electrotherapy signal generator is powered by the power supply to enable the electrotherapy signal generator to output an electrostimulation signal with the preset electrostimulation parameter, and an average current value of the power supply when the output end of the electrotherapy signal generator is connected to a component to be tested including hydrogel to be tested is obtained and recorded as a comparison value, which includes the following specific steps:
s2-1: the power supply is connected to the electrotherapy signal generator.
S2-2: the electrotherapy signal generator is adjusted to be able to output the actual electrical stimulation signal.
S2-3: and connecting the component to be tested containing the hydrogel to be tested as a load to the output end of the electrotherapy signal generator.
S2-4: the average current of the power supply at this time is checked and recorded as a comparison value.
As an example, please refer to fig. 2, which shows a schematic structural diagram of a to-be-tested assembly including a to-be-tested hydrogel 1, the to-be-tested assembly further includes an electrode sheet, the electrode sheet includes a substrate 2, positive plates 3 and negative plates 4 arranged at intervals, and positive terminals 5 and negative terminals 6 arranged at intervals, wherein the substrate 2 includes a first surface 201 and a second surface 202 arranged oppositely, the positive plates 3 and the negative plates 4 are arranged on the first surface 201 of the substrate 2, the positive terminals 5 and the negative terminals 6 are arranged on the second surface of the substrate 2, the positive terminals 5 are electrically connected with the positive plates 3, the negative terminals 6 are electrically connected with the negative plates 4, and the to-be-tested hydrogel 1 spans an area between the positive plates 3 and the negative plates 4 and is electrically connected with the positive plates 3 and the negative plates 4.
For example, in the step S3, the data table is searched, and if the power supply average current value data equal to the comparison value exists in the data table, the load impedance value corresponding to the power supply average current value data is used as the measured impedance value of the hydrogel to be measured. And if the data table does not have the power supply average current value data equal to the comparison value, taking the load impedance value corresponding to the power supply average current value data closest to the comparison value in the data table as the measured impedance value of the hydrogel to be measured.
As an example, in the step S1-3, when resistors with different resistances are provided as the loads, when the different impedance loads are sequentially arranged according to the impedance values, the impedance difference between any two adjacent loads is equal, for example, for a series of loads with impedances of 0 Ω, 50 Ω,100 Ω, 150 Ω, 200 Ω, and 250 Ω, the impedance difference between any two adjacent loads is 50 Ω. In other embodiments, the impedance difference between the adjacent loads may also be adjusted as needed, and the impedance difference between any two adjacent loads may also be unequal. In this embodiment, the difference in impedance between adjacent loads is preferably not more than 100 Ω, and more preferably less than 50 Ω. If the impedance difference between adjacent loads is smaller, the result is more accurate when the data table does not have the power supply average current value data equal to the comparison value and the load impedance value corresponding to the power supply average current value data closest to the comparison value in the data table needs to be selected as the measured impedance value of the hydrogel to be measured.
In summary, the method for measuring hydrogel impedance of the present invention employs a power supply to supply power to an electrotherapy signal generator so that the electrotherapy signal generator outputs an electrostimulation signal with preset electrostimulation parameters, obtains a data table by obtaining power supply average current values respectively corresponding to the output end of the electrotherapy signal generator when connected with different impedance loads, obtains the power supply average current value when the output end of the electrotherapy signal generator is connected with a to-be-measured component containing hydrogel to be measured, and records the value as a comparison value; and then, by inquiring the data table, if the average current value data of the power supply equal to the comparison value exists in the data table, taking the load impedance value corresponding to the average current value data of the power supply as the measured impedance value of the hydrogel to be measured. The method can measure the impedance of the hydrogel in a real state, namely the shape of the hydrogel conforms to the actual product condition (non-cutting sample), and the electrical stimulation signal on the hydrogel conforms to the actual product condition (non-universal meter or common signal source), so that the measured impedance of the hydrogel is more accurate. In addition, the method of measuring hydrogel impedance of the present invention can also be used to measure a cut hydrogel sample. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A method of measuring hydrogel impedance comprising the steps of:
supplying power to an electrotherapy signal generator through a power supply so that the electrotherapy signal generator outputs an electrical stimulation signal with preset electrical stimulation parameters, and acquiring power supply average current values respectively corresponding to the output end of the electrotherapy signal generator when the output end of the electrotherapy signal generator is connected with different impedance loads so as to obtain a data table;
supplying power to the electrotherapy signal generator through the power supply so that the electrotherapy signal generator outputs an electrostimulation signal with the preset electrostimulation parameter, acquiring the average current value of the power supply when the output end of the electrotherapy signal generator is connected with a component to be tested containing hydrogel to be tested, and recording the average current value as a comparison value;
and inquiring the data table, and if the power supply average current value data equal to the comparison value exists in the data table, taking the load impedance value corresponding to the power supply average current value data as the measured impedance value of the hydrogel to be measured.
2. The method of measuring hydrogel impedance of claim 1, wherein: and if the power supply average current value data equal to the comparison value does not exist in the data table, taking the load impedance value corresponding to the power supply average current value data closest to the comparison value in the data table as the measured impedance value of the hydrogel to be measured.
3. The method of measuring hydrogel impedance of claim 1, wherein: when the different impedance loads are sequentially arranged according to the impedance values, the impedance difference value between any two adjacent loads is equal.
4. The method of claim 3, wherein the impedance of the hydrogel is measured by: the difference in impedance between adjacent loads is no greater than 100 Ω.
5. The method of measuring hydrogel impedance of claim 1, wherein: the load comprises a pure resistance.
6. The method of measuring hydrogel impedance of claim 1, wherein: the subassembly that awaits measuring that contains the aquogel that awaits measuring still includes the electrode slice, the electrode slice includes positive plate and the negative pole piece that substrate, interval set up, the positive terminal and the negative terminal that the interval set up, the substrate is including relative first surface and the second surface that sets up, positive plate with the negative pole piece is located the substrate the first surface, positive terminal with the negative terminal is located the substrate the second surface, just positive terminal with the positive plate electricity is connected, the negative terminal with the negative pole piece electricity is connected, the aquogel that awaits measuring stridees across positive plate with region between the negative pole piece and with positive plate reaches the negative pole piece electricity is connected.
7. The method of measuring hydrogel impedance of claim 1, wherein: the power supply comprises a display module for displaying the average current value of the power supply, or the average current value of the power supply is acquired through an oscilloscope.
8. The method of measuring hydrogel impedance of claim 1, wherein: the frequency of the electrical stimulation signal is greater than 5Hz.
9. The method of measuring hydrogel impedance of claim 1, wherein: an output voltage of the power supply.
10. The method of measuring hydrogel impedance of claim 1, wherein: the output voltage, the output frequency and the output pulse width of the electrotherapy signal generator are adjustable.
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| CN202111086787.4A CN115825158A (en) | 2021-09-16 | 2021-09-16 | Method for measuring hydrogel impedance |
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| CN202111086787.4A CN115825158A (en) | 2021-09-16 | 2021-09-16 | Method for measuring hydrogel impedance |
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