CN114305431A - Myoelectricity and piezoelectric combined sensing system and control method thereof - Google Patents
Myoelectricity and piezoelectric combined sensing system and control method thereof Download PDFInfo
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- CN114305431A CN114305431A CN202210027898.6A CN202210027898A CN114305431A CN 114305431 A CN114305431 A CN 114305431A CN 202210027898 A CN202210027898 A CN 202210027898A CN 114305431 A CN114305431 A CN 114305431A
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Abstract
The application discloses flesh electricity and piezoelectricity combined type sensing system and control method thereof relates to fields such as sensing, wearable and medical health, and this system includes: a viscometric composite sensor and a signal conditioning part; the adhesive composite sensor comprises a hydrogel component, a piezoelectric material component, a packaging component and a medical adhesive tape component; the myoelectricity and piezoelectric combined sensor can be adhered to the surface of the skin, is used for synchronously acquiring surface myoelectricity signals and piezoelectric signals generated by human mechanical activity and provides a sensing signal source for a sensing system; the signal conditioning part comprises a signal acquisition module, a wireless communication module and a terminal display module, is used for acquiring the electric signals output by the viscous compound sensor in real time, transmits the electric signals to the mobile terminal through the wireless communication module to display and store data, and is suitable for sensing and monitoring the body surface muscle electricity and the limb activity.
Description
Technical Field
The invention relates to the fields of sensing, wearing and medical health, in particular to a myoelectric and piezoelectric combined sensing system and a control method thereof.
Background
At present, human-computer interaction application and research based on fusion of multi-source signals such as physiological signals (electroencephalogram and myoelectricity) and an inertial measurement system become research hotspots in the fields of sensing technology, wearable electronics, health and medical care and the like. The electroencephalogram, electrocardio and muscle electric signals have very important significance for monitoring, preventing, assisting diagnosis and treatment of related diseases such as heart, brain, premature birth, various muscles and the like, and the detection of the bioelectric signals can be conducted by induction through electrodes adhered to the surface of the skin of a human body. Highly efficient wearable, biocompatible, adhesive electrodes are crucial for accurate recording of these biopotential signals, especially for the continuous and effective monitoring of cardiovascular and cerebrovascular or muscular diseases in daily life.
However, the silver/silver chloride wet electrode widely used in clinic has the defects that the skin allergy is easily caused after long-term use, and the impedance is increased due to the drying of the conductive adhesive, so that the detection signal is reduced, and the like. In addition, the diagnosis and treatment of diseases by processing and identifying single group of electromyographic sensing signals are often too single, large errors and uncertainty are generated due to the existence of various environmental interferences, and if the combination of various sensors is introduced, for example, a piezoelectric film sensing unit is used for assisting an epidermal electrophysiological signal detection unit, the realization of multi-channel synchronous acquisition is expected to eliminate motion artifacts or various noise interferences, so that the accuracy of algorithm models for optimizing machine learning, depth identification and the like is further improved, and the disease diagnosis and treatment effects are benefited.
Disclosure of Invention
Based on this, the embodiment of the application provides a myoelectric and piezoelectric combined sensing system and a control method thereof, which are adhered to the surface of the skin of a human body to synchronously acquire myoelectric signals and piezoelectric signals, and can be used as a combined wearable sensing system to realize monitoring, auxiliary diagnosis and treatment of diseases.
In a first aspect, a myoelectric and piezoelectric composite sensing system is provided, which includes: a viscometric composite sensor and a signal conditioning part;
the adhesive composite sensor is adhered to the surface of the skin of a human body and is used for synchronously acquiring myoelectric signals and piezoelectric signals generated by the fluctuation of the skin caused by the activity of human muscle groups;
the signal conditioning part comprises a signal acquisition module, a wireless communication module and a terminal display module, and is used for acquiring the electric signals output by the viscous composite sensor in real time and transmitting the electric signals to the mobile terminal through the wireless communication module to display and store data.
Optionally, the adhesive composite sensor comprises: hydrogel subassembly, piezoelectric material subassembly, encapsulation subassembly, medical adhesive tape subassembly.
Optionally, the hydrogel component consists of two identical hydrogel electrodes, and the hydrogel electrodes are embedded in the lower surface of the packaging component and positioned at the bottom of the piezoelectric material component; the piezoelectric material component is positioned inside a packaging component, and the packaging component is used for packaging the hydrogel component and the piezoelectric material component; the medical adhesive tape component is used for adhering and fixing the hydrogel component, the piezoelectric material component and the packaging component on the surface of human skin.
Optionally, the hydrogel electrode comprises various conductive hydrogels such as polyvinyl alcohol/acrylamide graft copolymer hydrogel, copolymer hydrogel containing cyclodextrin structure, acrylamide copolymer hydrogel, PVA-sodium alginate-activated carbon copolymer hydrogel, collagen/calcium alginate interpenetrating network hydrogel, gelatin/sodium alginate interpenetrating network hydrogel and the like.
Optionally, the hydrogel electrode is doped with one or more of poly (3, 4-ethylenedioxythiophene) -poly (styrenesulfonic acid), an ionic compound, and a Mxene solution at various concentrations.
Optionally, the piezoelectric material component includes multiple piezoelectric films including high molecular polymer polyvinylidene fluoride and piezoelectric ceramics; the piezoelectric film is serpentine.
Optionally, the encapsulation component includes various flexible or elastic materials including silicone rubber or polydimethylsiloxane, and a material surface of the silicone rubber or the polydimethylsiloxane, which is in contact with the piezoelectric material component, has a modified microstructure.
Optionally, the medical adhesive tape component comprises common single-sided medical adhesive tapes including medical transparent PU films and muscle adhesive tapes.
In a second aspect, a method for controlling a myoelectric and piezoelectric combined sensing system is provided, which is applied to the system of the first aspect, and the method includes:
adhering the myoelectricity and piezoelectric composite sensor to the surface of human skin;
a hydrogel electrode in the adhesive composite sensor senses a surface electromyogram signal, the piezoelectric film generates a piezoelectric signal, and the surface electromyogram signal and the piezoelectric signal are synchronously acquired and digitized through the signal acquisition module;
and the data is transmitted to the mobile terminal through the wireless communication module to be processed, displayed and stored.
The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:
the invention discloses a myoelectricity and piezoelectric combined sensing system and a control method thereof, on one hand, a myoelectricity and piezoelectric combined sensor is adhered to the surface of skin with muscles, when the muscles are static or contract, the sensor can not only sense weak physiological current signals on the surface of the skin, but also collect piezoelectric signals generated by the deformation fluctuation of the skin caused by the movement of muscle groups by a piezoelectric film embedded in the sensor, and the synchronous acquisition of two groups of sensing signals (physiological electric signals and piezoelectric signals caused by deformation) reflects the contraction movement of the muscles more completely. On the other hand, the hydrogel electrode in the myoelectricity and piezoelectric combined sensor has the outstanding advantages of high conductivity, stretchability, high mechanical stress, stickiness and the like, so that the impedance between the hydrogel electrode and the skin is reduced, and the output noise of a sensing device is favorably reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
Fig. 1 is an architecture diagram of a myoelectricity and piezoelectric combined sensing system according to an embodiment of the present invention;
fig. 2 is an exploded structural view of a myoelectric and piezoelectric composite sensor according to an embodiment of the present invention;
FIG. 3 is an experimental data chart of a myoelectric and piezoelectric combined sensor according to an embodiment of the present invention;
fig. 4 is a flowchart of a control method of the myoelectric and piezoelectric combined sensing system according to the embodiment of the present invention.
The drawings are identified below:
the sensor comprises a 10-myoelectricity and piezoelectric composite sensor, a 20-signal conditioning part, 11-hydrogel electrodes, a 12-packaging component I, a 13-piezoelectric film lower electrode, a 14-piezoelectric film, a 15-piezoelectric film upper electrode, a 16-packaging component II, 17-medical adhesive tape, a 21-signal acquisition module, a 22-wireless communication module and a 23-terminal display module.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. It should also be noted that directional terms, such as "upper", "lower", "front", "rear", "left", "right", and the like, used in the embodiments are only directions referring to the drawings, and are not intended to limit the scope of the present disclosure. Throughout the drawings, like elements are represented by like or similar reference numerals. Conventional structures or constructions will be omitted when they may obscure the understanding of the present disclosure. In addition, the shapes and sizes of the respective components in the drawings do not reflect actual sizes and proportions, but merely illustrate contents of the embodiments of the present disclosure. Furthermore, in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.
Example 1
Referring to fig. 1, in an embodiment of the present invention, an electromyography and piezoelectric combined sensing system and a control method thereof are provided, where the system includes: a viscometric composite sensor 10, a signal conditioning section 20; myoelectricity and piezoelectricity combined type sensor includes: the hydrogel component, the piezoelectric material component, the packaging component and the medical adhesive tape component can be adhered to the skin surface of a human body, are used for synchronously acquiring surface electromyographic signals and piezoelectric signals generated by human mechanical activity and provide a sensing signal source for a sensing system; the signal conditioning part collects the electric signals output by the myoelectricity and piezoelectric composite sensor 10 in real time through the signal collecting module 21, and transmits the electric signals to the terminal display module 23 through the wireless communication module 22 to display and store data.
Referring to fig. 2, the electromyographic and piezoelectric composite sensor includes: 11-hydrogel electrode, 12-packaging component I, 13-piezoelectric film lower electrode, 14-piezoelectric film, 15-piezoelectric film upper electrode, 16-packaging component II and 17-medical adhesive tape.
The hydrogel electrode 11 is composed of two hydrogel conductive electrodes with the same shape and size, and is directly adhered to the surface of the skin; in order to increase the conductivity of the hydrogel electrode 11, one or two kinds of poly (3, 4-ethylenedioxythiophene) -poly (styrenesulfonic acid) (PETDOT: PSS) and Mxene conductive solutions with different concentrations are introduced in the process of preparing the hydrogel electrode;
the hydrogel electrode 11 is composed of cyclodextrin-containing acrylamide copolymer hydrogel, and is a cyclodextrin-containing polyacrylamide hydrogel formed by chemical initiation polymerization, and the preparation process of the hydrogel electrode can be simply described as follows: deionized water or pure water (20-25ml), acrylamide monomer (8-10g), methylene bisacrylamide (0.005-0.001g), ammonium persulfate (1g), beta-cyclodextrin (1g), poly (3, 4-ethylenedioxythiophene) -poly (styrenesulfonic acid) (100 muL-500 muL) or Mxene (100 muL-500 muL) solution are fully stirred and dissolved at room temperature, then proper amount of catalyst solution (20-50 muL of tetramethylethylenediamine) is added, and the dextrin-containing polyacrylamide network hydrogel electrode is formed through chemical crosslinking polymerization.
The conductivity of the hydrogel electrode can be enhanced by doping with different concentrations of one or more PEDOT: PSS, etc., conductive polymer, ionic compound (such as calcium chloride CaCl)2) Or MXene solution, etc.;
in the myoelectricity and piezoelectric combined sensor, a packaging material consists of a first packaging component 12 and a second packaging component 16, a hydrogel electrode is embedded into the first packaging component 12, and a piezoelectric material is positioned inside the first packaging component and the second packaging component;
the piezoelectric material consists of a piezoelectric film 14, a piezoelectric film lower electrode 13 and a piezoelectric film upper electrode 15;
the packaging component comprises various flexible or elastic materials including silica gel or Polydimethylsiloxane (PDMS), the silica gel or the PDMS is contacted with the piezoelectric film, and the packaging material in the embodiment is made of Ecoflex silica gel; the lower surface of the packaging component II 16 is provided with a microstructure which comprises various three-dimensional pyramids, circles, squares and the like, and the output electrical property of the piezoelectric material can be enhanced under the action of mechanical stress; and the microstructure on the lower surface of the packaging assembly II is realized by using a reverse mold of silica gel or polydimethylsiloxane.
The piezoelectric film upper electrode 15 and the piezoelectric film lower electrode 13 are connected to a first input end of the signal acquisition module through leads, and two electrodes of the hydrogel are connected to a second input end of the signal acquisition module; the medical adhesive tape consists of a transparent PU film or a medical muscle adhesive tape and is used for fixing the myoelectricity and piezoelectric combined sensor on the skin surface of a human body;
fig. 3 is a diagram of experimental data of a myoelectric and piezoelectric composite sensor according to an embodiment of the present invention. In the experimental process, the myoelectricity and piezoelectric composite sensor is adhered to the skin surface of a tested person, when nerves and muscles at the adhered part move, action potential is generated, and myoelectricity signals are induced through the conduction action of a hydrogel electrode in the myoelectricity and piezoelectric composite sensor; in addition, due to the movements of contraction, relaxation and the like of muscles, the piezoelectric film positioned in the myoelectricity and piezoelectric combined sensor synchronously generates piezoelectric signals due to mechanical deformation; the electromyographic signals and the piezoelectric signals have a certain corresponding relation, so that artifact removal, noise elimination and decoupling of the signals are facilitated, and the accuracy of algorithm model optimization of machine learning, depth recognition and the like is improved.
Example 2
Referring to fig. 4, the present embodiment discloses a myoelectric and piezoelectric combined sensing system and a control method thereof, and the method includes: the myoelectricity and piezoelectric combined sensor is adhered to the surface of the skin to be detected, corresponding potential changes can be generated after the tissues such as nerves, muscles and the like under the skin are stimulated, fluctuation motion of the surface of the skin is caused, myoelectricity signals and piezoelectric signals output by the myoelectricity and piezoelectric combined sensor are synchronously collected in real time through the signal conditioning part, then, a plurality of groups of collected electric signals are transmitted to the mobile terminal through the wireless communication module, and the signals are reprocessed, displayed and stored on the mobile terminal.
The myoelectric and piezoelectric combined sensing system control method provided by the embodiment of the application is applied to the implementation of the myoelectric and piezoelectric combined sensing system, and specific limitations on the myoelectric and piezoelectric combined sensing system control method can be referred to the above limitations on the myoelectric and piezoelectric combined sensing system, and are not repeated herein. 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 claims. 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 (9)
1. A myoelectric and piezoelectric composite sensing system, comprising: a viscometric composite sensor and a signal conditioning part;
the adhesive composite sensor is adhered to the surface of the skin of a human body and is used for synchronously acquiring myoelectric signals and piezoelectric signals generated by the fluctuation of the skin caused by the activity of human muscle groups;
the signal conditioning part comprises a signal acquisition module, a wireless communication module and a terminal display module, and is used for acquiring the electric signals output by the viscous composite sensor in real time and transmitting the electric signals to the mobile terminal through the wireless communication module to display and store data.
2. The system of claim 1, wherein the adhesive composite sensor comprises: hydrogel subassembly, piezoelectric material subassembly, encapsulation subassembly, medical adhesive tape subassembly.
3. The system of claim 2, wherein the hydrogel assembly is composed of two identical hydrogel electrodes embedded in the lower surface of the encapsulation assembly at the bottom of the piezoelectric material assembly; the piezoelectric material component is positioned inside a packaging component, and the packaging component is used for packaging the hydrogel component and the piezoelectric material component; the medical adhesive tape component is used for adhering and fixing the hydrogel component, the piezoelectric material component and the packaging component on the surface of human skin.
4. The system of claim 3, wherein the hydrogel electrode comprises various conductive hydrogel compositions such as polyvinyl alcohol/acrylamide graft copolymer hydrogel, cyclodextrin structure-containing copolymer hydrogel, acrylamide copolymer hydrogel, PVA-sodium alginate-activated carbon copolymer hydrogel, collagen/calcium alginate interpenetrating network hydrogel, gelatin/sodium alginate interpenetrating network hydrogel, and the like.
5. The system of claim 3 or 4, wherein the hydrogel electrode is doped with one or more of poly (3, 4-ethylenedioxythiophene) -poly (styrenesulfonic acid), an ionic compound, and a Mxene solution at various concentrations.
6. The system of claim 3, wherein the piezoelectric material assembly comprises a plurality of piezoelectric films including a high molecular polymer polyvinylidene fluoride and a piezoelectric ceramic; the piezoelectric film is serpentine.
7. The system of claim 3, wherein the encapsulation member comprises various flexible or elastic materials including silicone or polydimethylsiloxane having a modified microstructure on a surface of the material in contact with the piezoelectric material member.
8. The system of claim 3, wherein the medical tape assembly comprises a common single-sided medical tape including a medical transparent PU film and a muscle tape.
9. A control method of a myoelectric and piezoelectric combined sensing system, which is applied to the system as claimed in claims 1-8, characterized in that the method comprises:
adhering the myoelectricity and piezoelectric composite sensor to the surface of human skin;
a hydrogel electrode in the adhesive composite sensor senses a surface electromyogram signal, the piezoelectric film generates a piezoelectric signal, and the surface electromyogram signal and the piezoelectric signal are synchronously acquired and digitized through the signal acquisition module;
and the data is transmitted to the mobile terminal through the wireless communication module to be processed, displayed and stored.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115444974A (en) * | 2022-10-25 | 2022-12-09 | 中国地质大学（北京） | Electroactive composite patch for treating scald and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115444974A (en) * | 2022-10-25 | 2022-12-09 | 中国地质大学（北京） | Electroactive composite patch for treating scald and preparation method and application thereof |
| CN115444974B (en) * | 2022-10-25 | 2024-01-30 | 中国地质大学（北京） | Electroactive composite patch for treating scalds and preparation method and application thereof |
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