CN116158770A - Wearable facial surface myoelectricity acquisition device and method - Google Patents

Abstract

The invention discloses a wearable facial surface myoelectricity acquisition device and method, and belongs to the technical field of biomedicine. The device is characterized in that an acquisition electrode and a calibration electrode are respectively arranged on preset point positions of the carrier, so that when the carrier is attached to the head in a wearing mode, the acquisition electrode and the calibration electrode are respectively attached to the corresponding point positions of the head; the information acquisition preprocessing module is used for acquiring facial surface electromyographic signals in a differential amplification mode and preprocessing the facial surface electromyographic signals; the data transmission module is used for transmitting the data preprocessed by the information acquisition preprocessing module to the upper computer. The device provided by the invention has the advantages of simple use method, low requirements on professional skills of users, wide use field range and effective reduction of common-mode voltage noise such as power frequency interference. In addition, the digital filtering is realized through the upper computer, so that the hardware cost of the equipment is reduced.

Description

Wearable facial surface myoelectricity acquisition device and method

Technical Field

The invention relates to the technical field of biomedicine, in particular to a wearable facial surface myoelectricity acquisition device and method.

Background

Facial electromyography is a bioelectric signal from the surface of facial muscles when the recorded neuromuscular system activity is guided by electrodes.

Currently, electrodes commonly used in facial electromyography acquisition include invasive electrodes and commercial gel patch electrodes. During the use, invasive electrode needs to puncture human surface and contact the muscle bundle, can cause wound and pain to the patient, brings very big use risk. Commercial gel patch electrodes are generally large in application area for stability, can limit muscle activity or cause displacement due to activity when attached to the face, and are difficult to attach due to the uneven shape of nearby skeletal muscle when at a target site such as mastoid, and evaporation of gel can not be applied under long-time detection conditions. In addition, the wearing of the two electrodes is complicated, the arrangement of the electrodes needs very specialized operation, the requirements on the medical skills of operators are very high, the preparation time is long, and the use scene is limited. Meanwhile, the existing acquisition equipment is easy to be interfered by power frequency, is difficult to restrain common-mode voltage of a human body, needs to use an analog power frequency trap and an expensive analog isolation amplifier, is large in size, high in price and high in power consumption, and cannot be used in a portable daily way.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides the following technical scheme.

In one aspect, the present invention provides a wearable facial surface myoelectricity acquisition device, including:

the wearable carrier, the electrode module, the information acquisition preprocessing module, the data transmission module and the upper computer are embedded in the carrier;

the electrode module comprises an acquisition electrode and a calibration electrode, wherein the acquisition electrode and the calibration electrode are respectively arranged on preset point positions of the carrier, so that when the carrier is attached to the head in a wearing mode, the acquisition electrode and the calibration electrode are respectively attached to the point positions corresponding to the head;

the information acquisition preprocessing module is used for acquiring facial surface electromyographic signals in a differential amplification mode and preprocessing the facial surface electromyographic signals;

the data transmission module is used for transmitting the data preprocessed by the information acquisition preprocessing module to the upper computer;

the upper computer is used for carrying out digital filtering and feature extraction processing on the received data.

Preferably, the collection electrode and calibration electrode materials include, but are not limited to, alloy electrodes, metal oxide electrodes, graphite electrodes, and the like; in order to reduce the impedance between the electrode and the skin and improve the quality of the acquired signal, a conductive medium can be coated on the surface of the electrode.

Preferably, the collecting electrode and the calibration electrode are both fixed on a preset point of the carrier through elastic pieces.

Preferably, when the carrier is attached to the head by wearing, the collecting electrode is attached to the skin surface of the zygomatic upper muscle, the zygomatic lower muscle, the laugh muscle and the bite muscle corresponding to the left and right sides of the face, and the calibration electrode is attached to the mastoid position of the left and right sides of the head.

Preferably, the calibration electrode comprises a bias electrode and a reference electrode.

Preferably, the information acquisition preprocessing module comprises a bias channel, a reference channel and a plurality of surface myoelectric channels.

Preferably, the carrier is a headset.

Preferably, the device further comprises a power module embedded in the carrier, the power module being for powering the device.

Preferably, the device further comprises a sound collection module embedded in the carrier, wherein the sound collection module is used for collecting audio and transmitting the audio to the upper computer through the data transmission module.

In another aspect, the present invention provides a method for collecting myoelectricity on a face by using the wearable myoelectricity collecting device on a face, including:

cleaning the skin surface at the target location of the head;

starting the device to enable the information acquisition preprocessing module, the data transmission module and the upper computer to be in data connection;

wearing the device so that each electrode is attached to a target point;

if the signal continuously climbs or amplitude jump after being acquired and preprocessed by the information acquisition preprocessing module is larger than a threshold value, calibrating by fine adjustment of the wearing position, and starting data transmission and data processing of an upper computer after calibration.

The beneficial effects of the invention are as follows: according to the wearable facial surface myoelectricity acquisition device and method provided by the invention, the acquisition electrode and the calibration electrode are respectively arranged on the preset point positions of the carrier, so that when the carrier is attached to the head in a wearing mode, the acquisition electrode and the calibration electrode are respectively attached to the corresponding point positions of the head, the use method is simple, the requirement on the use scene is low, the requirement on the professional skills of a user is almost eliminated, and the problems of high requirement on the medical skills of operators, long preparation time, jing Shouxian use field and the like in the prior art are solved. Moreover, the invention is not only provided with the collecting electrode, but also provided with the calibration electrode, thereby collecting the facial surface electromyographic signals in a differential amplification mode, further effectively reducing common-mode voltage noise such as power frequency interference and the like, and solving the problem that the existing collecting equipment is difficult to inhibit the common-mode voltage of a human body. In addition, in the invention, the upper computer is used for realizing digital filtering, so that the hardware cost of the equipment is reduced.

Drawings

Fig. 1 is a schematic diagram of an overall structure of a headset-based acquisition device according to an embodiment of the present invention;

fig. 2 is a partially exploded view of a headset-based acquisition device according to an embodiment of the present invention;

FIG. 3 is a schematic diagram illustrating a usage mode of the headset as a carrier of the collecting device according to the embodiment of the present invention;

in the figure, the meanings of the symbols are as follows:

1. an earphone body; 2. an earphone housing; 3. an electrode; 4. an elastic member; 5. a data transmission module; 6. an information acquisition preprocessing module; 7. and a power supply module.

Detailed Description

In order to better understand the above technical solutions, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.

Aiming at the problems existing in the prior art, the invention provides a technical scheme of a wearable facial surface electromyography acquisition device and method by taking the acquisition of a surface electromyography of a high-quality facial fixed position as a main purpose.

Example 1

The embodiment of the invention provides a wearable facial surface myoelectricity acquisition device, which comprises:

the wearable carrier, the electrode module, the information acquisition preprocessing module, the data transmission module and the upper computer are embedded in the carrier;

the electrode module comprises an acquisition electrode and a calibration electrode, wherein the acquisition electrode and the calibration electrode are respectively arranged on preset point positions of the carrier, so that when the carrier is attached to the head in a wearing mode, the acquisition electrode and the calibration electrode are respectively attached to the point positions corresponding to the head;

the information acquisition preprocessing module is used for acquiring facial surface electromyographic signals in a differential amplification mode and preprocessing the facial surface electromyographic signals;

the data transmission module is used for transmitting the data preprocessed by the information acquisition preprocessing module to the upper computer;

the upper computer is used for carrying out digital filtering and feature extraction processing on the received data.

Wherein, the collecting electrode and the calibration electrode can be alloy wafer electrodes. The alloy wafer is used as the electrode, so that the collection process is noninvasive, conductive paste does not need to be smeared, and the electrode can be repeatedly used for a long time.

In a preferred embodiment of the invention, both the acquisition electrode and the calibration electrode may be fixed to a predetermined point of the carrier by means of elastic elements. The elastic piece is connected with the alloy wafer electrode, so that certain pressure can be given to the surface of the electrode and the contact skin, the stability of the contact area between the electrode and the skin is ensured, the contact impedance is low, and the quality and the universality of the collected signals are high.

In the invention, when the carrier is attached to the head by wearing, the collecting electrode is attached to the skin surface of the zygomatic upper muscle, the zygomatic lower muscle, the laugh muscle and the masseter muscle corresponding to the left and right sides of the face, and the calibration electrode is attached to the mastoid position of the left and right sides of the head. Through fixing the electrode position on the preset point position of carrier, in the use, only need wear the carrier at the head, the collection electrode on the carrier will correspond to laminating on the place and be on the skin surface of the cheek upper muscle of facial left and right sides, cheekbone lower muscle, laugh muscle and masseter muscle, calibration electrode will correspond to laminating on the place and be on the mastoid position of head left and right sides. Therefore, the skin surface potential changes of the starting parts of the zygomatic upper muscles, the zygomatic lower muscles, the laugh muscles and the masseter muscles on the left side and the right side of the face can be accurately collected, and the collected data are the composite surface potentials of four points on the left side and the right side respectively. Therefore, the acquisition device provided by the invention does not need to be placed by a professional, reduces the use difficulty, is stable to wear and convenient to carry, greatly increases the use scene range of the acquisition device, and is suitable for rehabilitation medical treatment, medical research, clinical diagnosis, home detection and the like.

In the present invention, the calibration electrode includes a bias electrode and a reference electrode. By arranging the calibration electrode and respectively corresponding the bias electrode and the reference electrode to mastoid positions on the left side and the right side of the head, facial surface electromyographic signals can be collected in a differential amplification mode, and common-mode voltage noise such as power frequency interference and the like is effectively reduced.

In the embodiment of the invention, the information acquisition preprocessing module comprises a bias channel, a reference channel and eight surface myoelectric channels. The collecting electrodes are eight, and are respectively corresponding to the positions of the zygomatic upper muscle, the zygomatic lower muscle, the laugh muscle and the masseter muscle on the left side and the right side of the face, the offset electrode and the reference electrode are respectively corresponding to the mastoid positions on the left side and the right side of the head, and each channel of the information collecting and preprocessing module is respectively corresponding to the corresponding electrode position to collect the facial electromyographic signals on the corresponding positions.

The device provided by the invention can further comprise a power module embedded in the carrier, wherein the power module is used for supplying power to the device. In one example, the power module provides a steady 3.3V voltage that may continuously power the device.

In a preferred embodiment of the invention, the carrier is a headset. As shown in fig. 1 and 2, the earphone comprises two earphone bodies 1 and one earphone housing 2, and the earphone housing 2 connects the two earphone bodies 1. The earphone housing 2 is integrally curved in an arc shape, is supported by the head, and gives a certain pressure to the earphone body 1 attached to the head. The ten alloy wafer electrodes 3 can be fixed on preset points of the saucer of the earphone body 1 through elastic pieces 4. In use, the ten alloy wafer electrodes 3 can be respectively attached to the skin surfaces of the zygomatic upper muscles, the zygomatic lower muscles, the laugh muscles and the masseter muscles on the left and right sides of the face, and the mastoid positions on the left and right sides of the head (as shown in fig. 3). The data transmission module 5 (such as a WiFi wireless transmission module, a bluetooth transmission module, an ethernet transmission module, etc.) and the information acquisition preprocessing module 6 are packaged in a right side cavity of the earphone, and the power module 7 can be packaged in a left side cavity of the earphone. In this structure, through adopting the headphone structure of earphone appearance as the carrier, realized collection system's ease of use, wear stability, portable convenience, very big increase collection system's use scene scope, reduced the use degree of difficulty.

In another preferred embodiment of the present invention, the apparatus may further include a sound collection module embedded in the carrier, and the sound collection module is configured to collect audio and transmit the audio to the host computer through the data transmission module. By adopting the structure, the audio cross-modal data can be synchronously acquired while the electromyographic signals of the surface of the face are acquired, the multidimensional characteristics of the electromyographic signals are enriched, the mapping relation of the cross-modal data is increased, and the study of the dependency relation between the facial muscle activity and the corresponding sounding mode characteristics is facilitated. The problem that the existing acquisition equipment can only record a single electromyographic signal and cannot record synchronous cross-mode data is solved.

The wearable facial surface myoelectricity acquisition device provided by the invention has the following beneficial effects:

(1) The acquisition mode is as follows: the device can collect the electromyographic signals of the surface of the face by adopting a noninvasive dry electrode, and the dry electrode is embedded in a fixed position of a carrier (such as an earphone pad disc) through an elastic piece to provide certain pressure for the dry electrode to be attached to a target point of the face; (2) wearing mode: the integrated circuit board is packaged in a carrier (earphone cavity), and the surface electromyographic signals of the fixed point position of the face can be collected only by wearing the device on the head and attaching the device on the target position, and the collected surface electromyographic signals are sent to an upper computer through a data creation module to carry out data processing such as filtering; (3) interference suppression: the device collects the facial surface electromyographic signals in a differential amplification mode, and the bias electrode and the reference electrode are arranged to correspond to the mastoid positions on the left side and the right side of the head respectively, so that common-mode voltage noise such as power frequency interference is effectively reduced; (4) enriching data: the device synchronously collects audio cross-modal data while collecting the electromyographic signals on the surface of the face, and enriches the multidimensional characteristics of the electromyographic signals.

Example two

The embodiment of the invention provides a method for collecting facial surface myoelectricity by using the wearable facial surface myoelectricity collecting device, which comprises the following steps:

cleaning the skin surface at the target location of the head;

starting the device to enable the information acquisition preprocessing module, the data transmission module and the upper computer to be in data connection;

wearing the device so that each electrode is attached to a target point;

if the signal continuously climbs or amplitude jump after being acquired and preprocessed by the information acquisition preprocessing module is larger than a threshold value, calibrating by fine adjustment of the wearing position, and starting data transmission and data processing of an upper computer after calibration.

If the carrier adopts the headset, in the actual use process, the position of the headset can be adjusted by enabling the bias electrode and the reference electrode to be attached to mastoid positions on the left side and the right side of the head when the headset is worn, so that each collecting electrode can be attached to each target point of the face.

After ensuring that the reference electrode and the bias electrode are attached to the mastoid position, the 50HZ notch filter and the band-pass filter can be sequentially started (which is equivalent to preprocessing signals by using the information acquisition preprocessing module). And then carrying out resting calibration, and if the signal continuously climbs or the amplitude jump is huge, finely adjusting the wearing position. After calibration, data processing is started.

The structure and function of the wearable facial surface myoelectricity acquisition device can be described in the first embodiment, and will not be described herein.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention. It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (9)

1. A wearable facial surface myoelectricity acquisition device, characterized by comprising:

the wearable carrier, the electrode module, the information acquisition preprocessing module, the data transmission module and the upper computer are embedded in the carrier;

the electrode module comprises an acquisition electrode and a calibration electrode, wherein the acquisition electrode and the calibration electrode are respectively arranged on preset point positions of the carrier, so that when the carrier is attached to the head in a wearing mode, the acquisition electrode and the calibration electrode are respectively attached to the point positions corresponding to the head;

the information acquisition preprocessing module is used for acquiring facial surface electromyographic signals in a differential amplification mode and preprocessing the facial surface electromyographic signals;

the data transmission module is used for transmitting the data preprocessed by the information acquisition preprocessing module to the upper computer;

the upper computer is used for carrying out digital filtering and feature extraction processing on the received data.

2. The wearable facial surface myoelectricity acquisition device of claim 1, wherein the acquisition electrode and the calibration electrode are both fixed on a preset point of the carrier by an elastic member.

3. The wearable facial surface myoelectricity acquisition device of claim 1, wherein the acquisition electrode is attached to the skin surface of the zygomatic upper, lower, laugh and bite muscles corresponding to the left and right sides of the face when the carrier is attached to the head in a wearing manner, and the calibration electrode is attached to the mastoid positions of the left and right sides of the head.

4. The wearable facial surface myoelectricity acquisition device of claim 3, wherein the calibration electrode comprises a bias electrode and a reference electrode.

5. The wearable facial surface myoelectricity acquisition device of claim 4, wherein the information acquisition pre-processing module includes one bias channel, one reference channel, and a plurality of surface myoelectricity channels.

6. The wearable facial surface myoelectricity acquisition device of claim 1, wherein the carrier employs a headset.

7. The wearable facial surface myoelectricity acquisition device of claim 1, further comprising a power module embedded in the carrier, the power module to power the device.

8. The wearable facial surface myoelectricity acquisition device of claim 1, further comprising a sound acquisition module embedded in the carrier, the sound acquisition module configured to acquire audio and transmit the audio to the host computer via the data transmission module.

9. A method of facial surface electromyography acquisition using a wearable facial surface electromyography acquisition device according to any of claims 1-8, comprising:

cleaning the skin surface at the target location of the head;

starting the device to enable the information acquisition preprocessing module, the data transmission module and the upper computer to be in data connection;

wearing the device so that each electrode is attached to a target point;

if the signal continuously climbs or amplitude jump after being acquired and preprocessed by the information acquisition preprocessing module is larger than a threshold value, calibrating by fine adjustment of the wearing position, and starting data transmission and data processing of an upper computer after calibration.

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