Temporomandibular joint movement status detection system and detection method

Abstract

This disclosure provides a temporomandibular joint (TMJ) motion state detection system and method, which can be applied to the field of bio-motion detection technology. The TMJ motion state detection method includes: a head-mounted TMJ motion state sensor for acquiring digital piezoelectric signals and digital static pressure signals of the TMJ; a processor for: responding to the received digital piezoelectric signals, decomposing the digital piezoelectric signals according to frequency to obtain low-frequency motion wave signals and high-frequency motion wave signals; determining the target period length and TMJ landmarks from the low-frequency motion wave signals; responding to the received digital static pressure signals, determining the target static pressure value corresponding to the static pressure signal based on a static pressure relationship function; and analyzing the low-frequency motion wave signals, high-frequency motion wave signals, target period length, TMJ landmarks, and target static pressure value to obtain TMJ target motion information corresponding to the target object.

Description

Technical Field

[0001] This disclosure relates to the field of biomechanical motion detection technology, and more specifically to a temporomandibular joint motion state detection system and detection method. Background Technology

[0002] Temporomandibular joint disorder (TMD) refers to a series of problems caused by functional abnormalities in the temporomandibular joint and related structures. The main manifestations include joint pain, clicking sounds during movement, and limited mandibular movement. Current methods for assessing a patient's temporomandibular joint status primarily rely on the experience and observation of physicians. However, due to subjectivity and experience differences among physicians, the resulting assessments of the temporomandibular joint status are prone to error.

[0003] In the process of realizing the above-mentioned inventive concept, the inventors discovered that the related technologies suffer from the following problems: due to the subjectivity of human judgment on the state of the temporomandibular joint, the results of the assessment of the state of the temporomandibular joint are subject to error, the assessment results are unstable, and the manual efficiency is low. Summary of the Invention

[0004] In view of the above problems, this disclosure provides a temporomandibular joint motion state detection system and detection method.

[0005] According to a first aspect of this disclosure, a temporomandibular joint (TMJ) motion state detection system is provided, characterized in that it comprises: a head-mounted TMJ motion state sensor, worn on the TMJ of a target object, for applying pressure to the TMJ in response to a detection signal from a processor, so that the head-mounted TMJ motion state sensor fits against the TMJ, and simultaneously acquiring digital piezoelectric signals and digital static pressure signals of the TMJ; and a processor, electrically connected to the head-mounted TMJ motion state sensor, for: decomposing the received digital piezoelectric signals according to frequency to obtain low-frequency motion wave signals and high-frequency... The motion wave signal is used, wherein the frequency of the low-frequency motion wave signal is lower than that of the high-frequency motion wave signal. From the low-frequency motion wave signal, the target cycle length and temporomandibular joint landmark are determined. In response to the received digital static pressure signal, the target static pressure value corresponding to the static pressure signal is determined based on the static pressure relationship function. The low-frequency motion wave signal, the high-frequency motion wave signal, the target cycle length, the temporomandibular joint landmark, and the target static pressure value are analyzed to obtain the temporomandibular joint target motion information corresponding to the target object. The temporomandibular joint target motion information includes the temporomandibular joint clicking information, the temporomandibular joint motion state, and the temporomandibular joint motion intensity.

[0006] According to embodiments of this disclosure, a head-mounted temporomandibular joint motion sensor includes a head-mounted frame, a signal acquisition module, an adjustment buckle, a signal processing module, and a connecting cable. The head-mounted frame is used to fix the head-mounted temporomandibular joint motion sensor to the temporomandibular joint of a target object, and in response to a detection signal from a processor, applies pressure to the temporomandibular joint to facilitate the signal acquisition module's fit against the temporomandibular joint. The signal acquisition module is disposed at both ends of the head-mounted frame, and in response to the pressure applied by the head-mounted frame to the temporomandibular joint, it facilitates the signal processing module's fit against the temporomandibular joint, acquires analog piezoelectric signals and analog static pressure signals of the temporomandibular joint, and sends the acquired analog piezoelectric signals and analog static pressure signals to the signal processing module. An adjustment buckle, positioned between the signal acquisition module and the signal processing module, is used to adjust the length of the headband so that the signal acquisition module is directly aligned with the temporomandibular joint of the target object. The signal processing module, located above the adjustment buckle, processes the received analog piezoelectric and analog static pressure signals, reducing signal loss during transmission and simultaneously generating digital piezoelectric and digital static pressure signals. A connecting cable, connected to the signal processing module, transmits the digital piezoelectric and digital static pressure signals to the processor, which then processes them to obtain the temporomandibular joint target motion information corresponding to the target object.

[0007] According to embodiments of this disclosure, the signal acquisition module includes a polyvinylidene fluoride (PVDF) piezoelectric sensor, a transmission medium, a transmission connector, and a static pressure sensor. The transmission medium, disposed on the PVDF piezoelectric sensor, transmits vibration waves generated by a target object moving according to a predetermined rule to the PVDF piezoelectric sensor for detection. The PVDF piezoelectric sensor detects the vibration waves and generates a simulated piezoelectric signal. The transmission connector, disposed between the PVDF piezoelectric sensor and the static pressure sensor, transmits the vibration waves to the static pressure sensor for detection. The static pressure sensor detects the vibration waves and generates a simulated static pressure signal.

[0008] According to embodiments of this disclosure, the signal processing module includes a signal amplification module, an analog-to-digital conversion module, and a signal transmission module. The signal amplification module amplifies the analog piezoelectric signal and the analog static pressure signal to obtain an intermediate analog piezoelectric signal and an intermediate analog static pressure signal. The analog-to-digital conversion module performs analog-to-digital conversion on the intermediate analog piezoelectric signal and the intermediate analog static pressure signal to obtain a digital piezoelectric signal and a digital static pressure signal. The signal transmission module transmits the digital piezoelectric signal and the digital static pressure signal to the processor via a connecting line for processing by the processor.

[0009] The second aspect of this disclosure provides a method for detecting the temporomandibular joint (TMJ) motion state, characterized in that, in response to a received digital piezoelectric signal, the digital piezoelectric signal is decomposed according to frequency to obtain a low-frequency motion wave signal and a high-frequency motion wave signal, wherein the frequency of the low-frequency motion wave signal is less than the frequency of the high-frequency motion wave signal; from the low-frequency motion wave signal, a target period length and a TMJ landmark are determined; in response to a received digital static pressure signal, a target static pressure value corresponding to the static pressure signal is determined based on a static pressure relationship function; the low-frequency motion wave signal, the high-frequency motion wave signal, the target period length, the TMJ landmark, and the target static pressure value are analyzed to obtain TMJ target motion information corresponding to the target object, wherein the TMJ target motion information includes TMJ clicking information, TMJ motion state, and TMJ motion intensity.

[0010] According to an embodiment of this disclosure, in response to a received digital piezoelectric signal, the digital piezoelectric signal is decomposed according to frequency to obtain a low-frequency motion wave signal and a high-frequency motion wave signal, including: in response to the received digital piezoelectric signal, filtering the digital piezoelectric signal to obtain an initial motion wave signal; decomposing the initial motion wave signal according to a first predetermined frequency to obtain a low-frequency motion wave signal; and decomposing the initial motion wave signal according to a second predetermined frequency to obtain a high-frequency motion wave signal.

[0011] According to embodiments of this disclosure, determining a target period length and a temporomandibular joint landmark from a low-frequency motion wave signal includes: determining multiple peaks of the low-frequency motion wave signal; dividing the low-frequency motion wave signal into multiple first low-frequency motion wave segment signals based on a first preset period, wherein the first preset period represents a period between every two adjacent peaks in the low-frequency motion wave signal; averaging the periods of the multiple first low-frequency motion wave segment signals to obtain the target period length; and determining the temporomandibular joint landmark from the low-frequency motion wave signal.

[0012] According to embodiments of this disclosure, determining temporomandibular joint landmarks from low-frequency motion wave signals includes: splitting the low-frequency motion wave signal into multiple second low-frequency motion wave segment signals based on a second preset period, wherein the second preset period includes an ascending signal segment and a descending signal segment connected to the ascending signal segment in the low-frequency motion wave signal; and determining the point with the maximum amplitude from each second low-frequency motion wave segment signal as a temporomandibular joint landmark.

[0013] According to embodiments of this disclosure, determining a target static pressure value corresponding to a static pressure signal based on a digital static pressure signal and a static pressure relationship function includes: averaging the digital static pressure signal to obtain an average digital static pressure signal; and substituting the average digital static pressure signal into the static pressure relationship function to obtain the target static pressure value corresponding to the static pressure signal.

[0014] According to embodiments of this disclosure, the low-frequency motion wave signal includes a low-frequency left-side motion wave signal and a low-frequency right-side motion wave signal. Analysis of the low-frequency motion wave signal, high-frequency motion wave signal, target cycle length, temporomandibular joint landmarks, and target static pressure value yields temporomandibular joint target motion information corresponding to the target object. This includes: decomposing the high-frequency motion wave signal according to the target cycle length to obtain multiple high-frequency motion wave segment signals; judging the amplitude of the peak point in each high-frequency motion wave segment signal against a predetermined amplitude; and recording the number of clicks occurring in the temporomandibular joint when the amplitude of the peak point is greater than the predetermined amplitude. The timing of the peak point is determined, and based on the timing of the peak point and the timing of the temporomandibular joint landmark, the stage of temporomandibular joint clicking is determined; the low-frequency left and right motion wave signals are aligned, and if the waveforms are consistent, the movement of the left and right temporomandibular joints is determined; if the waveforms are inconsistent, the movement offset between the left and right temporomandibular joints is determined based on the peak and trough points of the low-frequency left and right motion wave signals; the movement intensity of the temporomandibular joint of the target object is determined based on the target static pressure value.

[0015] A fifth aspect of this disclosure provides an electronic device comprising: one or more processors; and a memory for storing one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors perform the methods described above.

[0016] A sixth aspect of this disclosure also provides a computer-readable storage medium having executable instructions stored thereon, which, when executed by a processor, cause the processor to perform the methods described above.

[0017] The seventh aspect of this disclosure also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described method.

[0018] According to the temporomandibular joint motion state detection system and method disclosed herein, by wearing a head-mounted temporomandibular joint motion state sensor on the temporomandibular joint of the target object, when a relevant professional sends a detection signal through a processor, the head-mounted temporomandibular joint motion state sensor responds to the received detection signal and applies appropriate pressure to the temporomandibular joint, thereby making the head-mounted temporomandibular joint motion state sensor fit with the temporomandibular joint of the target object. During the periodic opening and closing activities of the target object, the head-mounted temporomandibular joint motion state sensor collects digital piezoelectric signals and digital static pressure signals. Then, the head-mounted temporomandibular joint motion sensor transmits the acquired digital piezoelectric signals and digital static pressure signals to the processor via a data line. The processor decomposes the digital piezoelectric signals according to frequency to obtain low-frequency motion wave signals and high-frequency motion wave signals. Based on the low-frequency motion wave signals, the target period length to be used for periodic division of the high-frequency motion wave signals and the opening and closing markers during the periodic movement of the target object, i.e., the temporomandibular joint markers, are determined. Then, based on the digital static pressure signals and the static pressure relationship function, the target static pressure value is determined. The obtained low-frequency motion wave signals, high-frequency motion wave signals, target period length, temporomandibular joint markers, and target static pressure values ​​are analyzed and processed to obtain temporomandibular joint target motion information, including temporomandibular joint clicking information, temporomandibular joint motion state, and temporomandibular joint motion intensity. This system enables the assessment of the temporomandibular joint (TMJ) clicking sounds, movement status, and opening and closing intensity of the target object, yielding accurate and consistent assessment results. This allows professionals to perform subsequent operations based on these consistent results. Furthermore, by utilizing a head-mounted TMJ motion sensor and processor to detect the target object, the system improves the efficiency of TMJ detection and reduces labor costs. Moreover, the head-mounted TMJ motion sensor also enables long-term monitoring and assessment of the target object. Attached Figure Description

[0019] The foregoing contents, as well as other objects, features, and advantages of this disclosure, will become clearer from the following description of embodiments with reference to the accompanying drawings, in which:

[0020] Figure 1 An application scenario diagram of the temporomandibular joint motion state detection system according to an embodiment of the present disclosure is shown;

[0021] Figure 2 A schematic diagram of a head-mounted temporomandibular joint motion state sensor for a temporomandibular joint motion state detection system according to an embodiment of the present disclosure is shown;

[0022] Figure 3 A flowchart of a method for detecting temporomandibular joint movement state according to an embodiment of the present disclosure is shown;

[0023] Figure 4 A schematic diagram of a digital piezoelectric signal according to an embodiment of the present disclosure is shown;

[0024] Figure 5 A system architecture block diagram of a temporomandibular joint motion state detection system according to an embodiment of the present disclosure is shown;

[0025] Figure 6 A block diagram of an electronic device for a temporomandibular joint motion state detection method according to an embodiment of the present disclosure is shown schematically. Detailed Implementation

[0026] The embodiments of the present disclosure will now be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the disclosure. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of the present disclosure for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concepts of the present disclosure.

[0027] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0028] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0029] When using expressions such as "at least one of A, B and C", they should generally be interpreted in accordance with the meaning that is commonly understood by those skilled in the art (e.g., "a system having at least one of A, B and C" should include, but is not limited to, a system having A alone, a system having B alone, a system having C alone, a system having A and B, a system having A and C, a system having B and C, and / or a system having A, B and C, etc.).

[0030] In the technical solution disclosed herein, the user information (including but not limited to user personal information, user image information, user device information, such as location information) and data (including but not limited to data used for analysis, stored data, and displayed data) involved are all information and data authorized by the user or fully authorized by all parties. Furthermore, the collection, storage, use, processing, transmission, provision, disclosure, and application of related data all comply with relevant laws, regulations, and standards, necessary confidentiality measures have been taken, and they do not violate public order and good morals. Corresponding operation entry points are provided for users to choose to authorize or refuse.

[0031] Temporomandibular joint disorder (TMD) refers to a series of symptoms and problems caused by functional abnormalities or diseases of the temporomandibular joint and its related structures. The main manifestations include pain in the joint area, clicking sounds during movement, and limited mandibular movement. During mouth opening and closing movements, the mandibular head rotates within the temporomandibular joint cavity along the frontal axis passing through it, while the mandibular body descends and elevates. During forward and backward movements of the mandible, the articular disc, along with the mandibular head, slides in an arc within the superior joint cavity around the frontal axis located within the articular tubercle. When the mouth is fully open, the mandibular head may even slide anterior to the articular tubercle and enter the infratemporal fossa, resulting in anterior dislocation. Clicking sounds occur during mouth opening movements and can occur at different stages of mandibular movement, ranging from a crisp single click to a series of cracking sounds.

[0032] However, current methods for assessing temporomandibular joint (TMJ) status primarily rely on physicians' experience and observation, lacking objective and accurate evaluation methods. This leads to inconsistencies in assessment results due to individual subjectivity. During the research and development process, researchers discovered that the subjective nature of human assessment of TMJ status in related technologies resulted in errors, instability, and low efficiency in the obtained TMJ status results.

[0033] In view of this, embodiments of the present disclosure provide a temporomandibular joint motion state detection system, characterized in that it includes: a head-mounted temporomandibular joint motion state sensor, worn on the temporomandibular joint of a target object, used to apply pressure to the temporomandibular joint in response to a detection signal from a processor, so that the head-mounted temporomandibular joint motion state sensor fits against the temporomandibular joint, and simultaneously acquiring digital piezoelectric signals and digital static pressure signals of the temporomandibular joint; and a processor, electrically connected to the head-mounted temporomandibular joint motion state sensor, used to: in response to the received digital piezoelectric signals, decompose the digital piezoelectric signals according to frequency to obtain low-frequency motion wave signals and high-frequency... The motion wave signal is used, wherein the frequency of the low-frequency motion wave signal is lower than that of the high-frequency motion wave signal. From the low-frequency motion wave signal, the target cycle length and temporomandibular joint landmark are determined. In response to the received digital static pressure signal, the target static pressure value corresponding to the static pressure signal is determined based on the static pressure relationship function. The low-frequency motion wave signal, the high-frequency motion wave signal, the target cycle length, the temporomandibular joint landmark, and the target static pressure value are analyzed to obtain the temporomandibular joint target motion information corresponding to the target object. The temporomandibular joint target motion information includes the temporomandibular joint clicking information, the temporomandibular joint motion state, and the temporomandibular joint motion intensity.

[0034] According to embodiments of this disclosure, the temporomandibular joint motion state detection system includes a head-mounted temporomandibular joint motion state sensor and a processor.

[0035] According to embodiments of this disclosure, a head-mounted device is worn on the temporomandibular joint of a target object to apply pressure to the temporomandibular joint in response to a detection signal from a processor, so that a head-mounted temporomandibular joint motion state sensor fits against the temporomandibular joint, while simultaneously acquiring digital piezoelectric signals and digital static pressure signals of the temporomandibular joint.

[0036] According to embodiments of this disclosure, the digital piezoelectric signal is an electrical signal, and the digital static pressure signal is a signal generated by pressure.

[0037] According to embodiments of this disclosure, when a target object wears a head-mounted temporomandibular joint motion state sensor to perform temporomandibular joint detection, it is necessary to perform periodic opening and closing activities so that the head-mounted temporomandibular joint motion state sensor can detect the movement of the temporomandibular joint during the opening and closing activities and collect digital piezoelectric signals and digital static pressure signals of the temporomandibular joint.

[0038] According to embodiments of this disclosure, a head-mounted temporomandibular joint motion state sensor and a processor can be connected via a data cable, so that the signal detected by the head-mounted temporomandibular joint motion state sensor is transmitted to the processor, and the processor further processes and analyzes the detected signal to obtain the analysis result of the motion state of the temporomandibular joint.

[0039] According to embodiments of this disclosure, the processor is electrically connected to a head-mounted temporomandibular joint motion state sensor, for:

[0040] According to embodiments of this disclosure, in response to a received digital piezoelectric signal, the digital piezoelectric signal is decomposed according to frequency to obtain a low-frequency motion wave signal and a high-frequency motion wave signal.

[0041] According to embodiments of this disclosure, the frequency of the low-frequency motion wave signal is less than the frequency of the high-frequency motion wave signal.

[0042] According to embodiments of this disclosure, the frequency of the obtained low-frequency motion wave signal is typically 0-5 Hz, and the frequency of the high-frequency motion wave signal is typically 5-20 Hz.

[0043] According to embodiments of this disclosure, the target period length and temporomandibular joint landmarks are determined from low-frequency motion wave signals.

[0044] According to embodiments of this disclosure, the target period length can be used as a period standard for dividing high-frequency motion wave signals, thereby dividing the signals into multiple segment signals with target period lengths.

[0045] According to embodiments of this disclosure, temporomandibular joint landmarks can be characterized as points where the target object ends the opening phase and begins the closing phase.

[0046] According to embodiments of this disclosure, the clicking sound and movement state of the temporomandibular joint can be determined by using low-frequency motion wave signals, high-frequency motion wave signals, target cycle length, and temporomandibular joint landmarks.

[0047] According to embodiments of this disclosure, in response to a received digital static pressure signal, a target static pressure value corresponding to the static pressure signal is determined based on a static pressure relationship function.

[0048] According to embodiments of this disclosure, the static pressure relationship function is determined based on the relationship curve between the pressure signal and the pressure value.

[0049] According to embodiments of this disclosure, the target static pressure value can be used to analyze the motion intensity of the target object during the opening and closing phases.

[0050] According to embodiments of this disclosure, low-frequency motion wave signals, high-frequency motion wave signals, target cycle length, temporomandibular joint landmarks, and target static pressure values ​​are analyzed to obtain temporomandibular joint target motion information corresponding to the target object.

[0051] According to embodiments of this disclosure, the target motion information of the temporomandibular joint includes clicking information of the temporomandibular joint, the motion state of the temporomandibular joint, and the motion intensity of the temporomandibular joint.

[0052] According to embodiments of this disclosure, by wearing a head-mounted temporomandibular joint motion sensor on the temporomandibular joint of a target object, when a relevant professional issues a detection signal via a processor, the head-mounted temporomandibular joint motion sensor responds to the received detection signal and applies appropriate pressure to the temporomandibular joint, thereby making the head-mounted temporomandibular joint motion sensor fit against the temporomandibular joint of the target object. During the periodic opening and closing activities of the target object, the head-mounted temporomandibular joint motion sensor collects digital piezoelectric signals and digital static pressure signals. Then, the head-mounted temporomandibular joint motion sensor transmits the acquired digital piezoelectric signals and digital static pressure signals to the processor via a data line. The processor decomposes the digital piezoelectric signals according to frequency to obtain low-frequency motion wave signals and high-frequency motion wave signals. Based on the low-frequency motion wave signals, the target period length to be used for periodic division of the high-frequency motion wave signals and the opening and closing markers during the periodic movement of the target object, i.e., the temporomandibular joint markers, are determined. Then, based on the digital static pressure signals and the static pressure relationship function, the target static pressure value is determined. The obtained low-frequency motion wave signals, high-frequency motion wave signals, target period length, temporomandibular joint markers, and target static pressure values ​​are analyzed and processed to obtain temporomandibular joint target motion information, including temporomandibular joint clicking information, temporomandibular joint motion state, and temporomandibular joint motion intensity. This system enables the assessment of the temporomandibular joint (TMJ) clicking sounds, movement status, and opening and closing intensity of the target object, yielding accurate and consistent assessment results. This allows professionals to perform subsequent operations based on these consistent results. Furthermore, by utilizing a head-mounted TMJ motion sensor and processor to detect the target object, the system improves the efficiency of TMJ detection and reduces labor costs. Moreover, the head-mounted TMJ motion sensor also enables long-term monitoring and assessment of the target object.

[0053] According to the embodiments of this disclosure, the clicking information of the temporomandibular joint, the movement state of the temporomandibular joint, and the movement intensity of the temporomandibular joint are intermediate results and cannot be used as target results. Those skilled in the art can make decisions based on the intermediate results.

[0054] Figure 1An application scenario diagram of the temporomandibular joint motion state detection system according to an embodiment of the present disclosure is shown.

[0055] like Figure 1 As shown, the application scenario according to this embodiment may include a head-mounted temporomandibular joint motion state sensor 101, a target object 102, and a processor 103. The head-mounted temporomandibular joint motion state sensor 101 is used to apply pressure to the target object 102 and collect signals based on the motion state of the target object's temporomandibular joint.

[0056] Users can interact with the processor 103 using the head-mounted temporomandibular joint motion status sensor 101 to receive or send signals, etc.

[0057] The processor 103 may be a processor that receives various digital signals, such as receiving and processing digital signals sent by the head-mounted temporomandibular joint motion state sensor 101 (for example only). The processor 103 may analyze and process the received digital signals and other data, and feed back the processing results (such as web pages, information, or data obtained or generated according to user requests) to the terminal device.

[0058] It should be noted that the temporomandibular joint motion state detection system provided in this embodiment of the present disclosure can generally be executed by the processor 103. Accordingly, the temporomandibular joint motion state detection system provided in this embodiment of the present disclosure can generally be located within the processor 103. The temporomandibular joint motion state detection system provided in this embodiment of the present disclosure can also be executed by a processor or processor cluster that is different from the processor 103 and is capable of communicating with the head-mounted temporomandibular joint motion state sensor 101 and / or the processor 103. Accordingly, the temporomandibular joint motion state detection system provided in this embodiment of the present disclosure can also be located in a processor or processor cluster that is different from the processor 103 and is capable of communicating with the head-mounted temporomandibular joint motion state sensor 101 and / or the processor 103.

[0059] According to an embodiment of this disclosure, when it is necessary to detect the temporomandibular joint movement state, the target object 102 wears a head-mounted temporomandibular joint movement state sensor 101 on the corresponding part of the head, and then connects the head-mounted temporomandibular joint movement state sensor 101 to the processor 103 via a data cable. The head-mounted temporomandibular joint movement state sensor 101 applies appropriate pressure to the temporomandibular joint of the target object 102, collects digital piezoelectric signals and digital static pressure signals of the temporomandibular joint, and sends the digital piezoelectric signals and digital static pressure signals of the temporomandibular joint to the processor 103 for processing and analysis to obtain the target movement information of the temporomandibular joint of the target object 102.

[0060] According to embodiments of this disclosure, a head-mounted temporomandibular joint motion state sensor includes a head-mounted frame, a signal acquisition module, an adjustment buckle, a signal processing module, and a connecting cable.

[0061] According to embodiments of this disclosure, a head-mounted frame is used to fix a head-mounted temporomandibular joint motion state sensor to the temporomandibular joint of a target object, and in response to a detection signal from a processor, applies pressure to the temporomandibular joint so that the signal acquisition module fits into the temporomandibular joint.

[0062] According to embodiments of this disclosure, the pressure applied to the temporomandibular joint can be determined based on feedback from the target object to determine whether it conforms to the temporomandibular joint.

[0063] According to an embodiment of this disclosure, a signal acquisition module is disposed at both ends of the head-mounted frame, and is used to respond to pressure applied by the head-mounted frame to the temporomandibular joint, so that the signal processing module is in close contact with the temporomandibular joint, to acquire the simulated piezoelectric signal and simulated static pressure signal of the temporomandibular joint, and to send the acquired simulated piezoelectric signal and simulated static pressure signal to the signal processing module.

[0064] According to an embodiment of this disclosure, a signal acquisition module is provided at each end of the head-mounted frame, and the two signal acquisition modules respectively acquire simulated piezoelectric signals and simulated static pressure signals of the left and right temporomandibular joints.

[0065] According to an embodiment of this disclosure, an adjustment buckle is disposed between the signal acquisition module and the signal processing module for adjusting the length of the head-mounted frame so that the signal acquisition module is aligned with the temporomandibular joint of the target object.

[0066] According to embodiments of this disclosure, by adjusting the telescopic length of the adjustment buckle, the headband can be better attached to the head of the target object, while the signal acquisition module is aligned with the temporomandibular joint of the target object, thereby improving wearing comfort and application range.

[0067] According to an embodiment of this disclosure, a signal processing module is disposed above the adjustment buckle and is used to process the received analog piezoelectric signal and analog static pressure signal to reduce the loss of analog piezoelectric signal and analog static pressure signal during transmission, and to obtain digital piezoelectric signal and digital static pressure signal.

[0068] According to embodiments of this disclosure, by processing the analog piezoelectric signals and analog static pressure signals on the left and right sides through a signal processing module, digital signals on the left and right sides can be obtained, namely, digital piezoelectric signals and digital static pressure signals on the left and right sides.

[0069] According to an embodiment of this disclosure, the connecting line is connected to a signal processing module to transmit digital piezoelectric signals and digital static pressure signals to a processor, so that the processor can process the digital piezoelectric signals and digital static pressure signals to obtain temporomandibular joint target motion information corresponding to the target object.

[0070] According to embodiments of this disclosure, a connecting cable connects a head-mounted temporomandibular joint motion state sensor to a processor, enabling signal transmission.

[0071] According to embodiments of this disclosure, a head-mounted temporomandibular joint motion sensor includes a head-mounted frame, a signal acquisition module, an adjustment buckle, a signal processing module, and a connecting cable. A signal acquisition module is located at each end of the head-mounted frame to acquire the motion state of the temporomandibular joint. An adjustment buckle is located between the signal acquisition module and the signal processing module. By adjusting the adjustment buckles on both sides, the head-mounted temporomandibular joint motion sensor can be better worn on the target's head. Above the adjustment buckle is the signal processing module, which processes the analog piezoelectric signal and analog static pressure signal acquired by the signal acquisition module to obtain digital piezoelectric signal and digital static pressure signal. These signals are then transmitted to the processor via the connecting cable for processing and analysis. This achieves the acquisition of the temporomandibular joint motion state of the target, facilitating analysis and processing by the processor to obtain a unified and accurate judgment result.

[0072] Figure 2 A schematic diagram of a head-mounted temporomandibular joint motion state sensor of a temporomandibular joint motion state detection system according to an embodiment of the present disclosure is shown.

[0073] like Figure 2 As shown, Figure 2 The image shows one side of a head-mounted temporomandibular joint (TMJ) motion sensor. The head-mounted TMJ motion sensor includes a head-mounted frame 201, a signal acquisition module 202, an adjustment buckle 203, a signal processing module 204, and a connecting line 205. The signal acquisition module 202 is located at one end of the head-mounted frame 201, enabling the acquisition of the temporomandibular joint's motion state. An adjustment buckle 203 is positioned between the signal acquisition module 202 and the signal processing module 204. Above the adjustment buckle 203 is the signal processing module 204. The signal processing module 204 processes the analog piezoelectric signal and analog static pressure signal acquired by the signal acquisition module 202 to obtain digital piezoelectric signals and digital static pressure signals. These digital piezoelectric signals and digital static pressure signals are then transmitted to the processor via the connecting line 205 for further processing and analysis.

[0074] According to embodiments of this disclosure, the signal acquisition module includes a polyvinylidene fluoride piezoelectric sensor, a transmission medium, a transmission connector, and a static pressure sensor.

[0075] According to embodiments of this disclosure, a transmission medium is disposed on a polyvinylidene fluoride piezoelectric sensor to transmit vibration waves generated by a target object moving according to a predetermined rule to the polyvinylidene fluoride piezoelectric sensor for detection.

[0076] According to embodiments of this disclosure, the transmission medium can be made of elastic ethylene vinyl acetate copolymer (EVA), thermoplastic elastomer (TPE), polyurethane (PU) or silicone rubber material. The vibration generated by temporomandibular movement can be effectively transmitted to the piezoelectric film, i.e., polyvinylidene fluoride (PVDF) piezoelectric sensor.

[0077] According to embodiments of this disclosure, a polyvinylidene fluoride piezoelectric sensor is used to detect vibration waves and generate analog piezoelectric signals.

[0078] According to embodiments of this disclosure, a transmission connector is disposed between a polyvinylidene fluoride piezoelectric sensor and a static pressure sensor for transmitting vibration waves to the static pressure sensor so that the static pressure sensor can perform detection.

[0079] According to embodiments of this disclosure, a transmission connector can be used to separate a polyvinylidene fluoride piezoelectric sensor and a static pressure sensor, and can also transmit vibration waves to the static pressure sensor.

[0080] According to embodiments of this disclosure, a static pressure sensor is used to detect vibration waves and generate a simulated static pressure signal.

[0081] According to embodiments of this disclosure, the signal acquisition module includes a polyvinylidene fluoride (PVDF) piezoelectric sensor, a transmission medium, a transmission connector, and a static pressure sensor. Vibrations generated by the target object during its periodic opening and closing activities are transmitted through the transmission medium to the PVDF piezoelectric sensor (piezoelectric film). The PVDF piezoelectric sensor detects the vibration to obtain a simulated piezoelectric signal. Then, the vibration wave is completely transmitted to the static pressure sensor through the transmission connector. The static pressure sensor detects the vibration wave to obtain a simulated static pressure signal. This achieves the detection of vibrations generated during the opening and closing phases, resulting in accurate and complete simulated piezoelectric and simulated static pressure signals.

[0082] According to embodiments of this disclosure, the signal processing module includes a signal amplification module, an analog-to-digital conversion module, and a signal transmission module.

[0083] According to embodiments of this disclosure, a signal amplification module is used to amplify the analog piezoelectric signal and the analog static pressure signal to obtain an intermediate analog piezoelectric signal and an intermediate analog static pressure signal.

[0084] According to embodiments of this disclosure, the signal acquisition module transmits the acquired analog piezoelectric signal and analog static pressure signal to the signal processing module. The signal processing module then sends the analog piezoelectric signal and analog static pressure signal to the signal amplification module for signal amplification, so that the amplified analog piezoelectric signal and analog static pressure signal can be clearer and meet the subsequent signal processing requirements.

[0085] According to embodiments of this disclosure, an analog-to-digital conversion module is used to perform analog-to-digital conversion processing on intermediate analog piezoelectric signals and intermediate analog static pressure signals to obtain digital piezoelectric signals and digital static pressure signals.

[0086] According to embodiments of this disclosure, a signal transmission module is used to transmit digital piezoelectric signals and digital static pressure signals to a processor via a connecting line, so that the processor can process them.

[0087] According to embodiments of this disclosure, the signal processing module includes a signal amplification module, an analog-to-digital conversion module, and a signal transmission module. The analog piezoelectric signal and analog static pressure signal acquired by the signal acquisition module are first amplified by the signal amplification module in the signal processing module, and then converted from digital to analog to obtain digital piezoelectric signal and digital static pressure signal. The digital piezoelectric signal and digital static pressure signal are then sent to the processor through a connecting line for subsequent processing and analysis to obtain the temporomandibular joint target motion information corresponding to the target object.

[0088] Figure 3 A flowchart of a method for detecting temporomandibular joint movement state according to an embodiment of the present disclosure is shown.

[0089] like Figure 3 As shown, the temporomandibular joint motion state detection method of this embodiment includes operations S310~S340.

[0090] In operation S310, in response to the received digital piezoelectric signal, the digital piezoelectric signal is decomposed according to the frequency to obtain a low-frequency motion wave signal and a high-frequency motion wave signal.

[0091] According to embodiments of this disclosure, the frequency of the low-frequency motion wave signal is less than the frequency of the high-frequency motion wave signal.

[0092] According to embodiments of this disclosure, the digital piezoelectric signal is decomposed according to frequency to obtain a low-frequency motion wave signal of 0-5Hz and a high-frequency motion wave signal of 5-20Hz.

[0093] In operation S320, the target cycle length and temporomandibular joint landmarks are determined from the low-frequency motion wave signal.

[0094] According to embodiments of this disclosure, the target period length can be used as a period standard for dividing high-frequency motion wave signals, thereby dividing them into multiple segment signals of target period length. The temporomandibular joint landmark can be characterized as the point where the target object ends the opening phase and begins the closing phase.

[0095] According to embodiments of this disclosure, a snapping sound can be obtained by using high-frequency motion wave signals, target period length, and temporomandibular joint landmarks, and the motion state of the temporomandibular joint can be obtained by using low-frequency motion wave signals.

[0096] In operation S330, in response to the received digital static pressure signal, the target static pressure value corresponding to the static pressure signal is determined based on the static pressure relationship function.

[0097] According to embodiments of this disclosure, the temporomandibular joint motion intensity of a target object can be determined based on the target static pressure value.

[0098] In operation S340, the low-frequency motion wave signal, high-frequency motion wave signal, target cycle length, temporomandibular joint landmarks, and target static pressure value are analyzed to obtain the temporomandibular joint target motion information corresponding to the target object.

[0099] According to embodiments of this disclosure, the target motion information of the temporomandibular joint includes clicking information of the temporomandibular joint, the motion state of the temporomandibular joint, and the motion intensity of the temporomandibular joint.

[0100] According to embodiments of this disclosure, a low-frequency motion wave signal and a high-frequency motion wave signal are obtained by decomposing a digital piezoelectric signal according to frequency. Based on the low-frequency motion wave signal, a target period length for periodic division of the high-frequency motion wave signal and opening / closing markers (i.e., temporomandibular joint markers) are determined during the periodic movement of the target object. Then, based on a digital static pressure signal and a static pressure relationship function, a target static pressure value is determined. The obtained low-frequency motion wave signal, high-frequency motion wave signal, target period length, temporomandibular joint markers, and target static pressure value are analyzed and processed to obtain temporomandibular joint target motion information, including temporomandibular joint clicking information, temporomandibular joint movement state, and temporomandibular joint movement intensity. This enables the judgment of the temporomandibular joint clicking sound, movement state, and opening / closing intensity of the target object, obtaining accurate and consistent judgment results. This allows professionals to perform subsequent operations based on consistent judgment results, further improving the detection efficiency of the temporomandibular joint, reducing labor costs, and facilitating long-term monitoring and judgment of the target object.

[0101] According to embodiments of this disclosure, in response to a received digital piezoelectric signal, the digital piezoelectric signal is decomposed according to frequency to obtain a low-frequency motion wave signal and a high-frequency motion wave signal, including:

[0102] According to an embodiment of this disclosure, in response to a received digital piezoelectric signal, the digital piezoelectric signal is filtered to obtain an initial motion wave signal.

[0103] According to embodiments of this disclosure, a high-pass filter, a low-pass filter, or a band-stop filter can be used to filter digital piezoelectric signals to remove noise and obtain an initial motion wave signal.

[0104] According to an embodiment of this disclosure, the initial motion wave signal is decomposed according to a first predetermined frequency to obtain a low-frequency motion wave signal.

[0105] According to embodiments of this disclosure, an initial motion wave signal is decomposed based on a first predetermined frequency using Empirical Mode Decomposition (EMD) or wavelet decomposition to obtain a low-frequency motion wave signal.

[0106] According to embodiments of this disclosure, the first predetermined frequency can be 0-5Hz.

[0107] According to an embodiment of this disclosure, the initial motion wave signal is decomposed according to a second predetermined frequency to obtain a high-frequency motion wave signal.

[0108] According to embodiments of this disclosure, empirical mode decomposition (EMD) or wavelet decomposition is used to further decompose the initial motion wave signal according to a second predetermined frequency to obtain a high-frequency motion wave signal.

[0109] According to embodiments of this disclosure, the second predetermined frequency can be 5-20Hz.

[0110] According to embodiments of this disclosure, the initial motion wave signal can be the original motion wave signal.

[0111] According to embodiments of this disclosure, by filtering the digital piezoelectric signal to remove noise, an initial motion wave signal is obtained. Using the initial motion wave signal as the original motion wave signal, the initial motion wave signal is decomposed according to a first predetermined frequency and a second predetermined frequency to obtain low-frequency motion wave signals and high-frequency motion wave signals of different frequencies. This achieves the decomposition processing of the digital piezoelectric signal, so as to facilitate the analysis of the temporomandibular joint of the target object based on the low-frequency motion wave signal and the high-frequency motion wave signal.

[0112] According to an embodiment of the present disclosure, determining a target cycle length and temporomandibular joint landmark points from a low-frequency motion wave signal includes:

[0113] According to an embodiment of the present disclosure, determining multiple peak points of the low-frequency motion wave signal from the low-frequency motion wave signal.

[0114] According to an embodiment of the present disclosure, based on a first preset cycle, splitting the low-frequency motion wave signal into multiple first low-frequency motion wave segment signals.

[0115] According to an embodiment of the present disclosure, wherein the first preset cycle represents that the signal between every two adjacent peak points in the low-frequency motion wave signal is one cycle.

[0116] According to an embodiment of the present disclosure, determining the peaks and valleys of the low-frequency motion wave signal, the high-frequency motion wave signal, and the initial motion wave signal, and obtaining multiple peak points and multiple valley points in the low-frequency motion wave signal.

[0117] According to an embodiment of the present disclosure, the peak points can be determined according to formula (1), and the valley points can be determined according to formula (2).

[0118] f(x) > f(x - 1) and f(x) > f(x + 1) (1);

[0119] f(x) < f(x - 1) and f(x) < f(x + 1) (2);

[0120] Wherein, x can represent the xth moment, f(x) can represent the amplitude corresponding to the xth moment on the low-frequency motion wave signal, f(x - 1) can represent the amplitude corresponding to the (x - ɪ)th moment on the low-frequency motion wave signal, and f(x + 1) can represent the amplitude corresponding to the (x + ɪ)th moment on the low-frequency motion wave signal.

[0121] According to an embodiment of the present disclosure, peak points BF ij , i = (1, 2, 3), j = (1, 2, 3,..., n) and valley points BG ij , i = (1, 2, 3), j = (1, 2, 3,..., n), wherein, i can represent the type of the motion wave signal, i = 1 is the initial motion wave signal, i = 2 is the high-frequency motion wave signal, i = 3 is the low-frequency motion wave signal, and j can represent the number of peak points or valley points.

[0122] According to an embodiment of the present disclosure, using two maximum peak times of the low-frequency motion wave signal as one cycle, that is, the first preset cycle, decomposing the low-frequency motion wave signal to obtain multiple single-cycle segments, that is, multiple first low-frequency motion wave segment signals.

[0123] According to embodiments of this disclosure, the target period length is obtained by averaging the periods of multiple first low-frequency motion wave segment signals.

[0124] According to an embodiment of this disclosure, there may be a total of m+1 first low-frequency motion wave segment signals. From the m+1 first low-frequency motion wave segment signals, m first low-frequency motion wave segment signals can be selected. The target period length is obtained by averaging the period lengths of the m first low-frequency motion wave segment signals.

[0125] According to an embodiment of this disclosure, the target period length can be calculated using formula (3).

[0126] (3);

[0127] Where T can be represented as the target period length, T q It can be characterized as the period length of the qth first low-frequency motion wave segment signal among m first low-frequency motion wave segment signals.

[0128] According to embodiments of this disclosure, since the first low-frequency motion wave segment signal is usually the stage when the target object begins to open or close, the initial motion wave signal may not be stable enough. Therefore, a first low-frequency motion wave segment signal other than the first low-frequency motion wave segment signal can be selected.

[0129] According to embodiments of this disclosure, the period length of each of the m first low-frequency motion wave segment signals may be different.

[0130] According to embodiments of this disclosure, the signal times of the initial motion wave signal, the low-frequency motion wave signal, and the high-frequency motion wave signal are consistent.

[0131] According to embodiments of this disclosure, temporomandibular joint landmarks are determined from low-frequency motion wave signals.

[0132] According to embodiments of this disclosure, the marker points for the end of each opening and the beginning of each closing are determined based on low-frequency motion wave signals.

[0133] According to embodiments of this disclosure, by first determining multiple peak points in a low-frequency motion wave signal, and then periodically splitting the low-frequency motion wave signal based on a first preset period to obtain multiple first low-frequency motion wave segment signals, and averaging the periods of the multiple first low-frequency motion wave segment signals to obtain a target period length, and simultaneously determining temporomandibular joint landmarks from the low-frequency motion wave signal, a precise target period length for processing high-frequency motion wave signals is obtained, so as to facilitate the processing of high-frequency motion wave signals using the target period length, thereby analyzing the snapping sound of the temporomandibular joint.

[0134] According to embodiments of this disclosure, determining temporomandibular joint landmarks from low-frequency motion wave signals includes:

[0135] According to embodiments of this disclosure, a low-frequency motion wave signal is split into multiple second low-frequency motion wave segment signals based on a second preset period.

[0136] According to an embodiment of this disclosure, the second preset period includes a rising signal segment in the low-frequency motion wave signal and a falling signal segment connected to the rising signal segment.

[0137] According to embodiments of this disclosure, the second preset period can be characterized as a motion period, which is the period during which the target object performs a complete opening and closing activity.

[0138] According to embodiments of this disclosure, a low-frequency motion wave signal is divided into multiple second low-frequency motion wave segment signals according to a second preset period, so as to facilitate the determination of each marker point of the end of an opening and the beginning of a closing.

[0139] According to embodiments of this disclosure, the point where the maximum amplitude is determined from each second low-frequency motion wave segment signal is a temporomandibular joint landmark.

[0140] According to embodiments of this disclosure, the point with the largest amplitude in the second low-frequency motion wave segment signal is the temporomandibular joint landmark x. p This allows us to obtain multiple temporomandibular joint landmarks.

[0141] According to embodiments of this disclosure, by dividing the low-frequency motion wave signal into multiple second low-frequency motion wave segment signals based on a second preset period, and then determining the point with the maximum amplitude in each second low-frequency motion wave segment signal as the temporomandibular joint landmark point, the low-frequency motion wave signal is divided into multiple motion cycles. This allows the target object to obtain the duration of each opening and closing movement, and accurately determines the point where the opening ends and the closing begins within each motion cycle, so as to facilitate subsequent analysis of the temporomandibular joint clicking sound based on the temporomandibular joint landmark point.

[0142] According to embodiments of this disclosure, determining a target static pressure value corresponding to a static pressure signal based on a digital static pressure signal, based on a static pressure relationship function, includes:

[0143] According to embodiments of this disclosure, the digital static pressure signal is averaged to obtain an average digital static pressure signal.

[0144] According to an embodiment of the present disclosure, the average digital static pressure signal can be calculated according to formula (4), which is shown below.

[0145] (4);

[0146] Where P can be represented as the average digital static pressure signal, P w It can be represented as the w-th digital static pressure signal, and t can be represented as the total number of t digital static pressure signals detected.

[0147] According to embodiments of this disclosure, the average digital static pressure signal is substituted into a static pressure relationship function to obtain a target static pressure value corresponding to the static pressure signal.

[0148] According to embodiments of this disclosure, the static pressure relationship function can be determined based on historical data (test data from a static pressure sensor), and the static pressure relationship function can be characterized as a pressure signal-pressure value relationship.

[0149] According to an embodiment of this disclosure, the target static pressure value can be calculated according to formula (5), which is shown below.

[0150] N = f(P) (5);

[0151] Where N can be represented as the target static pressure value, and f can be represented as the static pressure relationship function.

[0152] According to embodiments of this disclosure, the target static pressure value may be related to the sensing principle of the static pressure sensor.

[0153] According to embodiments of this disclosure, by averaging the digital static pressure signal, an average digital static pressure signal is obtained. The average digital static pressure signal is then substituted into a static pressure relationship function to obtain a target static pressure value corresponding to the static pressure signal. This enables the determination of the temporomandibular joint motion pressure of the target object, thereby helping to judge the motion intensity of the temporomandibular joint.

[0154] According to embodiments of this disclosure, the low-frequency motion wave signal includes a low-frequency left-side motion wave signal and a low-frequency right-side motion wave signal.

[0155] According to embodiments of this disclosure, low-frequency motion wave signals, high-frequency motion wave signals, target cycle length, temporomandibular joint landmarks, and target static pressure values ​​are analyzed to obtain temporomandibular joint target motion information corresponding to the target object, including:

[0156] According to embodiments of this disclosure, a high-frequency motion wave signal is decomposed based on a target period length to obtain multiple high-frequency motion wave segment signals.

[0157] According to the embodiments of this disclosure, the amplitude of the peak point in each high-frequency motion wave segment signal is judged against a predetermined amplitude. If the amplitude of the peak point is greater than the predetermined amplitude, the number of times the temporomandibular joint clicks and the time of the peak point are recorded. Based on the time of the peak point and the time of the temporomandibular joint landmark, the clicking stage of the temporomandibular joint is determined.

[0158] According to an embodiment of this disclosure, when the amplitude of the peak point is greater than a predetermined amplitude, it is confirmed that the temporomandibular joint makes a snapping sound at the peak point, and the number of snapping sounds is accumulated.

[0159] According to the embodiments of this disclosure, whether a popping sound has occurred can be determined according to formula (6).

[0160] f3(BF) 3j )>Tan(j=1,2,3,...,n) (6);

[0161] Where f3 can be represented as a high-frequency motion wave signal, BF 3j It can be represented as the j-th peak point in a high-frequency motion wave signal, and Tan can be represented as a predetermined amplitude.

[0162] According to embodiments of this disclosure, when a snapping sound occurs at the peak of the temporomandibular joint, the time of the peak of the snapping sound is determined, and this time is compared with the time of the temporomandibular joint landmark. If the time of the peak of the snapping sound is greater than the time of the temporomandibular joint landmark, it is confirmed that the snapping sound in the high-frequency motion wave segment signal occurs during the closed-mouth phase. If the time of the peak of the snapping sound is less than the time of the temporomandibular joint landmark, it is confirmed that the snapping sound in the high-frequency motion wave segment signal occurs during the open-mouth phase. The above comparison and judgment are performed on each high-frequency motion wave segment signal to obtain a determination of the snapping sound of the temporomandibular joint.

[0163] According to the embodiments of this disclosure, the stage at which the popping sound occurs can be determined according to formula (7).

[0164] tan p >x p (p=1,2,3,…,a) (7);

[0165] Among them, tan p This can be represented as the time of the p-th wave crest where the popping sound occurs, x p It can be represented as the moment of the temporomandibular joint landmark within the p-th movement cycle corresponding to the p-th popping peak, and a can be represented as a total of a popping sounds.

[0166] According to embodiments of this disclosure, it is necessary to determine whether a clicking sound exists in both the left and right temporomandibular joints and the stage at which the clicking sound occurs.

[0167] According to embodiments of this disclosure, low-frequency left-side motion wave signals and low-frequency right-side motion wave signals are aligned. When the waveforms of the signals are consistent, it is determined that the movements of the left and right temporomandibular joints are consistent. When the waveforms of the signals are inconsistent, the movement offset between the left and right temporomandibular joints is determined based on the peak and trough points of the low-frequency left-side motion wave signal and the peak and trough points of the low-frequency right-side motion wave signal.

[0168] According to embodiments of this disclosure, since there is a PVDF piezoelectric sensor on both the left and right sides, the digital piezoelectric signals on both the left and right sides are processed as described above to obtain a low-frequency left-side motion wave signal f2(x). 左 And the low-frequency right-side motion wave signal f2(x) 右 .

[0169] According to embodiments of this disclosure, when the waveforms of the low-frequency left-side motion wave signal and the low-frequency right-side motion wave signal are inconsistent, the temporomandibular joint movement deviation is determined.

[0170] According to the embodiments of this disclosure, the movement deviation of the temporomandibular joint can be determined according to formulas (8) and (9), which are shown below.

[0171] |BF 2j左 - BF 2j右 |>K, (j=1,2,3,...,n) (8);

[0172] |BG 2j左 - BG 2j右 |>K, (j=1,2,3,...,n) (9);

[0173] Among them, BF 2j左 This can be represented as the time of the j-th peak of the low-frequency left-side motion wave signal, BF 2j右 K can be represented as the time of the j-th peak of the low-frequency right-side motion wave signal, and BG can be represented as the predetermined time. 2j左 This can be represented as the time of the j-th trough of the low-frequency left-side motion wave signal, BG 2j右 It can be characterized as the moment of the j-th trough of the low-frequency right-side motion wave signal.

[0174] According to the embodiments of this disclosure, when both formula (8) and formula (9) are satisfied, it is determined that there is a misalignment or displacement of the temporomandibular joints on the left and right sides.

[0175] According to embodiments of this disclosure, when it is determined that there is misalignment or displacement of the temporomandibular joints on both sides, the displacement of the temporomandibular joints on both sides is judged.

[0176] According to the embodiments of this disclosure, the displacement of the temporomandibular joints on the left and right sides can be determined by formulas (10) and (11), which are shown below.

[0177] (BF) 2j左 - BF 2j右 )>0, (j=1,2,3,...,n) (10);

[0178] (BF) 2j左 - BF 2j右 )<0, (j=1,2,3,...,n) (11);

[0179] According to embodiments of this disclosure, when the difference between the time of the j-th peak of the low-frequency left-side motion wave signal and the time of the j-th peak of the low-frequency right-side motion wave signal is greater than 0, the temporomandibular joint movement shifts to the right; when the difference between the time of the j-th peak of the low-frequency left-side motion wave signal and the time of the j-th peak of the low-frequency right-side motion wave signal is less than 0, the temporomandibular joint movement shifts to the left.

[0180] According to embodiments of this disclosure, it is necessary to determine whether the temporomandibular joints on both sides have shifted in motion.

[0181] According to embodiments of this disclosure, the temporomandibular joint motion intensity of a target object is determined based on a target static pressure value.

[0182] According to the embodiments of this disclosure, the target static pressure values ​​of the left and right sides are determined based on the digital static pressure signals collected from the left and right sides. If the target static pressure values ​​of the left and right sides are the same, it is confirmed that the pressure on the left and right sides is the same. If the target static pressure values ​​of the left and right sides are different, it is confirmed that the pressure on the left and right sides is different. It is then determined which side has a larger target static pressure value, and the side corresponding to the larger target static pressure value receives greater pressure.

[0183] According to embodiments of this disclosure, a pressure threshold can be set, and pressure can be applied to the target object so that the target static pressure value of the temporomandibular joint of the target object reaches the pressure threshold. Thus, under the same pressure standard, the movement amplitude of the target object is determined based on the amplitude in the digital piezoelectric signal. If the amplitude in the digital piezoelectric signal of the target object is greater than the standard amplitude, it is determined that the movement intensity of the temporomandibular joint of the target object is relatively strong.

[0184] According to embodiments of this disclosure, the high-frequency motion wave signal is decomposed according to the target period length to obtain multiple high-frequency motion wave segment signals. Then, based on the peak points and predetermined amplitudes of the high-frequency motion wave segment signals on the left and right sides, the analysis results of whether the clicking of the temporomandibular joint on the left and right sides occurs and the stage of occurrence are obtained. Then, the low-frequency motion wave signals on the left and right sides are used to determine whether the movement of the temporomandibular joint on the left and right sides is consistent and whether the temporomandibular joint is deviated to the left or right. Finally, the target static pressure value of the temporomandibular joint on the left and right sides is used to determine the movement intensity of the temporomandibular joint of the target object when performing opening and closing activities.

[0185] Figure 4 A schematic diagram of a digital piezoelectric signal according to an embodiment of the present disclosure is shown.

[0186] like Figure 4 As shown, Figure 4 The digital piezoelectric signals of the right and left temporomandibular joints are shown. The horizontal axis represents time and the vertical axis represents amplitude. As can be seen from the figure, the digital piezoelectric signals of the temporomandibular joints on the left and right sides are not consistent. The opening intensity of the right temporomandibular joint is greater, while the closing intensity of the left temporomandibular joint is greater.

[0187] Figure 5 A system architecture block diagram of a temporomandibular joint motion state detection system according to an embodiment of the present disclosure is shown.

[0188] like Figure 5 As shown, Figure 5The overall system modules of the temporomandibular joint motion state detection system are shown. The signal acquisition module of the head-mounted temporomandibular joint motion state sensor includes a PVDF piezoelectric sensor, a transmission medium, a transmission connector, and a static pressure sensor. Vibration waves are transmitted to the PVDF piezoelectric sensor through the transmission medium to obtain an analog piezoelectric signal, which is then transmitted to the static pressure sensor through the transmission connector to obtain an analog static pressure signal. Both the analog piezoelectric signal and the analog static pressure signal are transmitted to the signal processing module, which includes a signal amplification module, an analog-to-digital conversion module, and a signal transmission module. After signal amplification and analog-to-digital conversion... The signal is converted to a digital signal, resulting in a digital piezoelectric signal and a digital static pressure signal, which are then sent to a processor for analysis. The processor decomposes the digital piezoelectric signal according to frequency to obtain low-frequency and high-frequency motion wave signals. Then, it calculates the peaks and troughs of the low-frequency and high-frequency motion wave signals and determines the temporomandibular joint landmarks. Next, it processes the digital static pressure signal to obtain the target static pressure value. Based on the low-frequency, high-frequency motion wave signals and the target static pressure value, it analyzes the temporomandibular joint clicking information, the temporomandibular joint movement state, and the temporomandibular joint movement intensity.

[0189] Figure 6 A block diagram of an electronic device for a temporomandibular joint motion state detection method according to an embodiment of the present disclosure is shown schematically.

[0190] like Figure 6 As shown, an electronic device according to an embodiment of this disclosure includes a processor 601, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 602 or a program loaded from a storage portion 608 into a random access memory (RAM) 603. The processor 601 may include, for example, a general-purpose microprocessor (e.g., a CPU), an instruction set processor and / or an associated chipset and / or a special-purpose microprocessor (e.g., an application-specific integrated circuit (ASIC)), etc. The processor 601 may also include onboard memory for caching purposes. The processor 601 may include a single processing unit or multiple processing units for performing different actions of the method flow according to an embodiment of this disclosure.

[0191] RAM 603 stores various programs and data required for the operation of the electronic device. Processor 601, ROM 602, and RAM 603 are interconnected via bus 604. Processor 601 performs various operations of the method flow according to embodiments of the present disclosure by executing programs in ROM 602 and / or RAM 603. It should be noted that the programs may also be stored in one or more memories other than ROM 602 and RAM 603. Processor 601 may also perform various operations of the method flow according to embodiments of the present disclosure by executing programs stored in said one or more memories.

[0192] According to embodiments of this disclosure, the electronic device may further include an input / output (I / O) interface 605, which is also connected to a bus 604. The electronic device 600 may also include one or more of the following components connected to the I / O interface 605: an input section 606 including a keyboard, mouse, etc.; an output section 607 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 608 including a hard disk, etc.; and a communication section 609 including a network interface card such as a LAN card, modem, etc. The communication section 609 performs communication processing via a network such as the Internet. A drive 610 is also connected to the I / O interface 605 as needed. A removable medium 611, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., is installed on the drive 610 as needed so that computer programs read from it can be installed into the storage section 608 as needed.

[0193] This disclosure also provides a computer-readable storage medium, which may be included in the device / apparatus / system described in the above embodiments; or it may exist independently and not assembled into the device / apparatus / system. The computer-readable storage medium carries one or more programs that, when executed, implement the method according to the embodiments of this disclosure.

[0194] According to embodiments of this disclosure, the computer-readable storage medium may be a non-volatile computer-readable storage medium, such as including, but not limited to: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this disclosure, the computer-readable storage medium may be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. For example, according to embodiments of this disclosure, the computer-readable storage medium may include ROM 602 and / or RAM 603 and / or one or more memories other than ROM 602 and RAM 603 described above.

[0195] Embodiments of this disclosure also include a computer program product comprising a computer program containing program code for performing the methods shown in the flowchart. When the computer program product is run on a computer system, the program code enables the computer system to implement the electrocardiogram monitoring method based on electromagnetic signals provided in embodiments of this disclosure.

[0196] When the computer program is executed by the processor 601, it performs the functions defined in the system / apparatus of this disclosure embodiments. According to embodiments of this disclosure, the systems, apparatuses, modules, units, etc., described above can be implemented by computer program modules.

[0197] In one embodiment, the computer program may rely on a tangible storage medium such as an optical storage device or a magnetic storage device. In another embodiment, the computer program may also be transmitted and distributed in the form of signals over a network medium, and downloaded and installed via the communication section 609, and / or installed from the removable medium 611. The program code contained in the computer program can be transmitted using any suitable network medium, including but not limited to: wireless, wired, etc., or any suitable combination thereof.

[0198] In such an embodiment, the computer program can be downloaded and installed from a network via the communication section 609, and / or installed from the removable medium 611. When the computer program is executed by the processor 601, it performs the functions defined in the system of this disclosure embodiment. According to embodiments of this disclosure, the systems, devices, apparatuses, modules, units, etc., described above can be implemented by computer program modules.

[0199] Those skilled in the art will understand that the features described in the various embodiments and / or claims of this disclosure can be combined or combined in various ways, even if such combinations or combinations are not explicitly described in this disclosure. In particular, the features described in the various embodiments and / or claims of this disclosure can be combined or combined in various ways without departing from the spirit and teachings of this disclosure. All such combinations and / or combinations fall within the scope of this disclosure.

Claims

1. A temporomandibular joint movement state detection system, characterized in that, include: A head-mounted temporomandibular joint motion sensor is worn on the temporomandibular joint of a target object. In response to a detection signal from a processor, pressure is applied to the temporomandibular joint to make the head-mounted temporomandibular joint motion sensor fit against the temporomandibular joint, while simultaneously acquiring digital piezoelectric signals and digital static pressure signals of the temporomandibular joint. The processor, electrically connected to the head-mounted temporomandibular joint motion sensor, is used for: In response to the received digital piezoelectric signal, the digital piezoelectric signal is decomposed according to frequency to obtain a low-frequency motion wave signal and a high-frequency motion wave signal, wherein the frequency of the low-frequency motion wave signal is less than the frequency of the high-frequency motion wave signal. The target cycle length and temporomandibular joint landmarks are determined from the low-frequency motion wave signal. In response to the received digital static pressure signal, a target static pressure value corresponding to the static pressure signal is determined based on a static pressure relationship function; The low-frequency motion wave signal, the high-frequency motion wave signal, the target period length, the temporomandibular joint landmark, and the target static pressure value are analyzed to obtain temporomandibular joint target motion information corresponding to the target object. The temporomandibular joint target motion information includes the snapping information of the temporomandibular joint, the motion state of the temporomandibular joint, and the motion intensity of the temporomandibular joint.

2. The system according to claim 1, wherein, The head-mounted temporomandibular joint motion sensor includes a head-mounted frame, a signal acquisition module, an adjustment buckle, a signal processing module, and a connecting cable; The head-mounted frame is used to fix the head-mounted temporomandibular joint motion state sensor at the temporomandibular joint of the target object, and to apply pressure to the temporomandibular joint in response to the detection signal from the processor, so that the signal acquisition module fits into the temporomandibular joint; The signal acquisition module is disposed at both ends of the head-mounted frame. It is used to respond to the pressure applied by the head-mounted frame to the temporomandibular joint, so that the signal processing module is in close contact with the temporomandibular joint, to acquire the simulated piezoelectric signal and the simulated static pressure signal of the temporomandibular joint, and to send the acquired simulated piezoelectric signal and the simulated static pressure signal to the signal processing module. The adjustment buckle, which is disposed between the signal acquisition module and the signal processing module, is used to adjust the length of the head-mounted frame so that the signal acquisition module is directly aligned with the temporomandibular joint of the target object. The signal processing module, located above the adjustment buckle, is used to process the received analog piezoelectric signal and analog static pressure signal, reduce the loss of the analog piezoelectric signal and analog static pressure signal during transmission, and simultaneously obtain the digital piezoelectric signal and the digital static pressure signal. The connecting line is connected to the signal processing module and is used to transmit the digital piezoelectric signal and the digital static pressure signal to the processor, so that the processor can process the digital piezoelectric signal and the digital static pressure signal to obtain the temporomandibular joint target motion information corresponding to the target object.

3. The system according to claim 2, wherein, The signal acquisition module includes a polyvinylidene fluoride piezoelectric sensor, a transmission medium, a transmission connector, and a static pressure sensor. The transmission medium, which is disposed on the polyvinylidene fluoride piezoelectric sensor, is used to transmit the vibration wave generated by the target object moving according to a predetermined rule to the polyvinylidene fluoride piezoelectric sensor so that the polyvinylidene fluoride piezoelectric sensor can perform detection. The polyvinylidene fluoride piezoelectric sensor is used to detect the vibration wave and generate the simulated piezoelectric signal. The transmission connector is disposed between the polyvinylidene fluoride piezoelectric sensor and the static pressure sensor, and is used to transmit the vibration wave to the static pressure sensor so that the static pressure sensor can perform detection. The static pressure sensor is used to detect the vibration wave and generate the simulated static pressure signal.

4. The system according to claim 2, wherein, The signal processing module includes a signal amplification module, an analog-to-digital conversion module, and a signal transmission module; The signal amplification module is used to amplify the analog piezoelectric signal and the analog static pressure signal to obtain an intermediate analog piezoelectric signal and an intermediate analog static pressure signal. An analog-to-digital conversion module is used to perform analog-to-digital conversion processing on the intermediate analog piezoelectric signal and the intermediate analog static pressure signal to obtain the digital piezoelectric signal and the digital static pressure signal. The signal transmission module is used to transmit the digital piezoelectric signal and the digital static pressure signal to the processor through the connecting line, so that the processor can process them.

5. A method for detecting the movement state of the temporomandibular joint, characterized in that, include: In response to the received detection signal, digital piezoelectric signals and digital static pressure signals of the temporomandibular joint of the target object are acquired, wherein the digital piezoelectric signals and the digital static pressure signals are both acquired by a head-mounted temporomandibular joint motion state sensor worn on and attached to the temporomandibular joint of the target object; In response to the received digital piezoelectric signal, the digital piezoelectric signal is decomposed according to frequency to obtain a low-frequency motion wave signal and a high-frequency motion wave signal, wherein the frequency of the low-frequency motion wave signal is less than the frequency of the high-frequency motion wave signal. The target cycle length and temporomandibular joint landmarks are determined from the low-frequency motion wave signal. In response to the received digital static pressure signal, a target static pressure value corresponding to the static pressure signal is determined based on a static pressure relationship function; The low-frequency motion wave signal, the high-frequency motion wave signal, the target period length, the temporomandibular joint landmark, and the target static pressure value are analyzed to obtain temporomandibular joint target motion information corresponding to the target object. The temporomandibular joint target motion information includes the snapping information of the temporomandibular joint, the motion state of the temporomandibular joint, and the motion intensity of the temporomandibular joint.

6. The method according to claim 5, wherein, The step of responding to the received digital piezoelectric signal by decomposing the digital piezoelectric signal according to frequency to obtain a low-frequency motion wave signal and a high-frequency motion wave signal includes: In response to the received digital piezoelectric signal, the digital piezoelectric signal is filtered to obtain an initial motion wave signal; The initial motion wave signal is decomposed according to a first predetermined frequency to obtain the low-frequency motion wave signal. The initial motion wave signal is decomposed according to a second predetermined frequency to obtain the high-frequency motion wave signal.

7. The method according to claim 5, wherein, Determining the target cycle length and temporomandibular joint landmarks from the low-frequency motion wave signal includes: From the low-frequency motion wave signal, determine multiple peak points of the low-frequency motion wave signal; Based on a first preset period, the low-frequency motion wave signal is split into multiple first low-frequency motion wave segment signals, wherein the first preset period represents that the signal between every two adjacent wave crests in the low-frequency motion wave signal is one period. The target period length is obtained by averaging the periods of the plurality of first low-frequency motion wave segment signals. The temporomandibular joint landmark is determined from the low-frequency motion wave signal.

8. The method according to claim 7, wherein, Determining the temporomandibular joint landmark from the low-frequency motion wave signal includes: Based on a second preset period, the low-frequency motion wave signal is split into multiple second low-frequency motion wave segment signals, wherein the second preset period includes a rising signal segment and a falling signal segment connected to the rising signal segment in the low-frequency motion wave signal; The point at which the maximum amplitude is determined from each second low-frequency motion wave segment signal is the temporomandibular joint landmark.

9. The method according to claim 5, wherein, The step of determining the target static pressure value corresponding to the static pressure signal based on the digital static pressure signal using the static pressure relationship function includes: The digital static pressure signal is averaged to obtain an average digital static pressure signal. The average digital static pressure signal is substituted into the static pressure relationship function to obtain the target static pressure value corresponding to the static pressure signal.

10. The method according to claim 5, wherein, The low-frequency motion wave signal includes a low-frequency left-side motion wave signal and a low-frequency right-side motion wave signal; The low-frequency motion wave signal, the high-frequency motion wave signal, the target period length, the temporomandibular joint landmark, and the target static pressure value are analyzed to obtain temporomandibular joint target motion information corresponding to the target object, including: The high-frequency motion wave signal is decomposed according to the target period length to obtain multiple high-frequency motion wave segment signals. The amplitude of the peak point in each high-frequency motion wave segment signal is judged against the predetermined amplitude. If the amplitude of the peak point is greater than the predetermined amplitude, the number of times the temporomandibular joint clicks and the time of the peak point are recorded. Based on the time of the peak point and the time of the temporomandibular joint landmark point, the clicking stage of the temporomandibular joint is determined. Alignment processing is performed on the low-frequency left-side motion wave signal and the low-frequency right-side motion wave signal. If the waveforms of the signals are consistent, it is determined that the movements of the left temporomandibular joint and the right temporomandibular joint are consistent. If the waveforms of the signals are inconsistent, the movement offset between the left temporomandibular joint and the right temporomandibular joint is determined based on the peak and trough points of the low-frequency left-side motion wave signal and the peak and trough points of the low-frequency right-side motion wave signal. The movement intensity of the temporomandibular joint of the target object is determined based on the target static pressure value.

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