A knee joint detection device based on multi-channel acoustic information

Abstract

This invention belongs to the field of medical device technology and discloses a knee joint detection device based on multi-channel acoustic information. It includes a wearable carrier and a sensor array mounted on the wearable carrier. When the wearable carrier is in wear mode, the acoustic sensor units in the sensor array are evenly distributed around the knee joint to collect acoustic signals from the knee joint under different activity states. Each acoustic sensor unit includes a flexible circuit board and two microphones mounted on the flexible circuit board; both microphones on the flexible circuit board are connected to a main control unit. This invention fixes the array-type acoustic sensor units at points around the knee joint, realizing multi-channel, multi-location acoustic signal acquisition, which can provide effective data support for personalized diagnosis and treatment recommendations for patients.

Description

Technical Field

[0001] This utility model belongs to the field of medical equipment technology and relates to a knee joint detection device based on multi-channel acoustic information. Background Technology

[0002] Traditional methods for detecting knee injuries rely on imaging tools such as X-rays and magnetic resonance imaging (MRI), but these methods require expensive equipment and are difficult to monitor in real time, and are usually only used after an injury has occurred.

[0003] Acoustic data-based knee joint detection methods are gradually becoming a promising research direction due to their non-invasiveness, low cost, and portability. However, existing technologies still face technical bottlenecks in accurately identifying the type and extent of knee joint injuries using acoustic signals. Current acoustic detection technologies for the knee joint mainly focus on using a single sensor to collect acoustic data, resulting in limited data dimensionality. This makes it difficult to fully capture the complex movements and physical changes within the knee joint, hindering the accurate identification of complex knee injuries. Furthermore, single-channel data is susceptible to noise interference, leading to insufficient accuracy in data processing. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned technical problems in the prior art by providing a knee joint detection device based on multi-channel acoustic information, which can quickly and accurately acquire multi-channel acoustic signals from the knee joint area.

[0005] To achieve the above objectives, the present invention adopts the following technical solution.

[0006] This invention provides a knee joint detection device based on multi-channel acoustic information, comprising a wearable carrier and a sensor array mounted on the wearable carrier. The sensor array includes a first acoustic sensor unit, a second acoustic sensor unit, a third acoustic sensor unit, a fourth acoustic sensor unit, a fifth acoustic sensor unit, a sixth acoustic sensor unit, a seventh acoustic sensor unit, an eighth acoustic sensor unit, a ninth acoustic sensor unit, a tenth acoustic sensor unit, and an eleventh acoustic sensor unit. The first, second, and seventh acoustic sensor units are arranged sequentially from top to bottom along the vertical axis of symmetry of the wearable carrier within a defined area. The third and fourth acoustic sensor units are symmetrically arranged with respect to the vertical axis of symmetry, as are the fifth and sixth acoustic sensor units. The fifth and sixth acoustic sensor units are located below the third and fourth acoustic sensor units, respectively. The eighth, ninth, tenth, and eleventh acoustic sensor units are located at the four corners of the defined area of ​​the wearable carrier.

[0007] In one possible implementation, the spacing between the first acoustic sensor unit and the second acoustic sensor unit, the spacing between the third acoustic sensor unit and the fourth acoustic sensor unit, and the spacing between the fifth acoustic sensor unit and the sixth acoustic sensor unit are 6-8 cm; the spacing between the seventh acoustic sensor unit and the second acoustic sensor unit is 6-8 cm; and the spacing between the eighth acoustic sensor unit and the ninth acoustic sensor unit, and the spacing between the tenth acoustic sensor unit and the eleventh acoustic sensor unit are 10-15 cm.

[0008] In one possible implementation, when the wearable device is in a worn state, the acoustic sensor units in the sensor array are evenly distributed around the knee joint to collect acoustic signals of the knee joint under different activity states. The first and second acoustic sensor units are located on the upper and lower sides of the patella, respectively; the third and fourth acoustic sensor units are located on the left and right sides of the patella, respectively; the fifth and sixth acoustic sensor units are located on both sides of the tibiofemoral joint, respectively; the seventh acoustic sensor unit is located on the anterior side of the tibial head; the eighth and ninth acoustic sensor units are located on the left and right sides of the tibia and at a distance of 5-10 cm from the tibiofemoral joint, respectively; and the tenth and eleventh acoustic sensor units are located on the left and right sides of the femur and at a distance of 10-15 cm from the tibiofemoral joint, respectively.

[0009] In one implementation, each acoustic sensor unit is capable of capturing acoustic changes within the knee joint at different angles, including acoustic characteristics under flexion, extension, and weight-bearing states. The acoustic sensor unit includes a flexible circuit board and two microphones mounted on the board. The flexible circuit board has good flexibility, facilitating the subject's movement according to a given exercise plan. Both microphones on the flexible circuit board are connected to a main control unit; the main control unit employs a programmable logic controller (PLC) such as PAL, GAL, or FPGA. The main control unit controls the data acquisition of each microphone according to commands from the server and sends the acquired acoustic signals to the server.

[0010] In one possible implementation, the knee joint detection device based on multi-channel acoustic information further includes sensors (such as inertial sensors, angle sensors, etc.) for acquiring motion physical quantities to assist subsequent analysis, so as to distinguish and extract acoustic signals during motion when processing data.

[0011] In a preferred implementation, the knee joint detection device based on multi-channel acoustic information includes a first inertial sensor and a second inertial sensor; the first and second inertial sensors are arranged along the upper and lower edges of the vertical axis of symmetry of the wearable carrier within a defined area of ​​the wearable carrier. Both the first and second inertial sensors are connected to the main control unit.

[0012] Compared with the prior art, the knee joint detection device based on multi-channel acoustic information provided by this utility model has the following beneficial effects:

[0013] (1) This utility model fixes the array of acoustic sensors at points around the knee joint to realize multi-channel, multi-position acoustic signal acquisition, which can provide effective data support for personalized diagnosis and treatment suggestions for patients;

[0014] (2) This utility model uses a microphone array to collect acoustic signals from the knee joint. It has the advantages of high precision, non-invasiveness and portability. It can be used as a non-invasive, wearable device in places outside professional environments such as hospitals (such as communities). Attached Figure Description

[0015] Figure 1 A schematic diagram of the knee joint detection device based on multi-channel acoustic information provided in Embodiment 1 of this utility model in its usage state;

[0016] Figure 2 A schematic diagram of the structure of the wearable carrier in its deployed state;

[0017] Figure 3 This is a schematic diagram of an acoustic sensor unit;

[0018] Figure 4 This is a schematic diagram of a knee joint detection device based on multi-channel acoustic information.

[0019] Figure 5 A schematic diagram showing the connection status of the main control unit of the knee joint detection device based on multi-channel acoustic information and some acoustic sensor units provided in Embodiment 1 of this utility model.

[0020] Figure 6 This is a schematic diagram of the knee joint detection device based on multi-channel acoustic information in use, as provided in Embodiment 2 of this utility model.

[0021] In the diagram, 1-wearable carrier; 11-wearable carrier definition area; 2-sensor array; 21-first acoustic sensor unit; 22-second acoustic sensor unit; 23-third acoustic sensor unit; 24-fourth acoustic sensor unit; 25-fifth acoustic sensor unit; 26-sixth acoustic sensor unit; 27-seventh acoustic sensor unit; 28-eighth acoustic sensor unit; 29-ninth acoustic sensor unit; 210-tenth acoustic sensor unit; 211-eleventh acoustic sensor unit; 212-flexible circuit board; 213-microphone; 3-first inertial sensor; 4-second inertial sensor. Detailed Implementation

[0022] The technical solutions of various embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] Example 1

[0024] The knee joint detection device based on multi-channel acoustic information provided in this embodiment is used to be worn on the knee joint to collect acoustic signals of the knee joint.

[0025] like Figures 1-3 As shown, the knee joint detection device based on multi-channel acoustic information includes a wearable carrier 1 and a sensor array 2 consisting of 11 acoustic sensor units mounted on the wearable carrier. The wearable carrier 1 is fitted onto the subject's knee joint.

[0026] Due to the complex structure of the bones and ligaments of the knee joint, in this embodiment, the knee joint detection device based on multi-channel acoustic information adopts an array, placing 11 acoustic sensor units at designated locations near the knee joint to achieve multi-channel, multi-location sound signal acquisition.

[0027] The array-type acoustic sensor used is smaller in size and less demanding in terms of usage conditions and placement compared to ultrasonic devices, making it suitable for use in complex environments.

[0028] Wearable carrier 1 uses a knee brace or elastic band; Velcro can also be attached to both sides of wearable carrier 1 for easy fixation at the subject's knee joint. The acoustic sensor array uses a structure similar to a knee brace / elastic band as the wearable carrier to achieve initial fixation of the array, and each acoustic sensor is fixed in a designated position using double-sided adhesive.

[0029] The acoustic sensor units in the sensor array are evenly distributed around the knee joint to collect acoustic signals of the knee joint under different activity states. Eleven acoustic sensor units are fixed on the upper and lower sides of the patella, the left and right sides, the sides of the tibiofemoral joint, the front of the tibial head, the left and right sides of the tibia at a distance of 5-10 cm from the tibiofemoral joint, and the left and right sides of the femur at a distance of 10-15 cm from the tibiofemoral joint.

[0030] Specifically, such as Figures 1-2 As shown, the sensor array 2 includes a first acoustic sensor unit 21, a second acoustic sensor unit 22, a third acoustic sensor unit 23, a fourth acoustic sensor unit 24, a fifth acoustic sensor unit 25, a sixth acoustic sensor unit 26, a seventh acoustic sensor unit 27, an eighth acoustic sensor unit 28, a ninth acoustic sensor unit 29, a tenth acoustic sensor unit 210, and an eleventh acoustic sensor unit 211. The first acoustic sensor unit 21, the second acoustic sensor unit 22, and the seventh acoustic sensor unit 27 are arranged sequentially from top to bottom along the vertical axis of symmetry of the wearable carrier 1 within the wearable carrier definition area 11; the third acoustic sensor unit 23 and the fourth acoustic sensor unit 24 are arranged symmetrically with respect to the vertical axis of symmetry; the fifth acoustic sensor unit 25 and the sixth acoustic sensor unit 26 are arranged symmetrically with respect to the vertical axis of symmetry; the fifth acoustic sensor unit 25 and the sixth acoustic sensor unit are located below the third acoustic sensor unit 23 and the fourth acoustic sensor unit 24, respectively; the eighth acoustic sensor unit 28, the ninth acoustic sensor unit 29, the tenth acoustic sensor unit 210, and the eleventh acoustic sensor unit 211 are located at the four corners of the wearable carrier definition area 11, respectively.

[0031] Furthermore, the distance between the first acoustic sensor unit 21 and the second acoustic sensor unit 22, the distance between the third acoustic sensor unit 23 and the fourth acoustic sensor unit 24, and the distance between the fifth acoustic sensor unit 25 and the sixth acoustic sensor unit 26 are 6cm; the distance between the seventh acoustic sensor unit 27 and the second acoustic sensor unit 22 is 6cm; the distance between the eighth acoustic sensor unit 28 and the ninth acoustic sensor unit 29, and the distance between the tenth acoustic sensor unit 210 and the eleventh acoustic sensor unit 211 are 12cm.

[0032] When the wearable device is in the wearing state, the first acoustic sensor unit 21 and the second acoustic sensor unit 22 are located on the upper and lower sides of the patella, respectively; the third acoustic sensor unit 23 and the fourth acoustic sensor unit 24 are located on the left and right sides of the patella, respectively; the fifth acoustic sensor unit 25 and the sixth acoustic sensor unit 26 are located on both sides of the tibiofemoral joint, respectively; the seventh acoustic sensor unit 27 is located on the front side of the tibial head; the eighth acoustic sensor unit 28 and the ninth acoustic sensor unit 29 are located on the left and right sides of the tibia and at a distance of 5-10 cm from the tibiofemoral joint, respectively; and the tenth acoustic sensor unit 210 and the eleventh acoustic sensor unit 211 are located on the left and right sides of the femur and at a distance of 10-15 cm from the tibiofemoral joint, respectively.

[0033] Each acoustic sensor unit can capture acoustic changes within the knee joint at different angles, including acoustic characteristics under flexion, extension, and weight-bearing conditions. For example... Figures 3-5 As shown, the acoustic sensor unit includes a flexible circuit board 212 and two microphones 213 mounted on the flexible circuit board 212. The flexible circuit board 212 has good bending performance, facilitating the subject's movements according to a given motion plan. Both microphones 213 on the flexible circuit board are connected to the main control unit. Figure 5 As shown, the circuit board containing the main control unit has a microphone interface, which connects to each microphone via a transmission line. The circuit board also has a power supply interface for powering the main control unit and the microphones; all of these use conventional electrical connection configurations already disclosed in this field.

[0034] In this embodiment, the main control unit uses an FPGA programmable logic controller to collect, store, and transmit the acoustic signals from each microphone to the server for display. The server here is a PC.

[0035] The circuit board carrying the main control unit can be fixed separately from the wearable carrier 1, for example, fixed to the front of the thigh or the upper part of the outer side.

[0036] The knee joint detection device based on multi-channel acoustic information is worn on the subject's knee joint; the acoustic signals of the knee joint are collected by 11 acoustic sensor units installed on the wearable carrier 1, and are synchronously transmitted to the server through the main control unit connected to it, and the collected acoustic signals are displayed.

[0037] By comprehensively comparing the acoustic signals collected by each microphone with standard acoustic signals obtained under different knee joint damage conditions (such as cartilage wear, cruciate ligament injury, synovitis, loose bodies in the knee joint, etc.), the health status of the subject's knee joint can be identified. This helps to diagnose knee joint injuries in the early stages, enabling subjects to take rehabilitation measures as early as possible and avoid the condition from worsening.

[0038] Example 2

[0039] This embodiment is a further improvement based on Embodiment 1.

[0040] like Figure 6 As shown, the knee joint detection device based on multi-channel acoustic information provided in this embodiment includes not only a wearable carrier 1 and a sensor array 2, but also a first inertial sensor 3 and a second inertial sensor 4 connected to the main control unit. The first inertial sensor 3 and the second inertial sensor 4 are arranged along the upper and lower edges of the vertical axis of symmetry of the wearable carrier 1 within the defined area 11 of the wearable carrier. When any one of the inertial sensors (IMU) detects a signal change, it indicates that the subject is moving, and therefore the acoustic signals during movement can be distinguished and extracted during subsequent data acquisition. In this embodiment, only the acoustic signals during movement are acquired.

[0041] Those skilled in the art will recognize that the embodiments described herein are intended to help the reader understand the principles of this invention, and should be understood as not limiting the scope of protection of this invention to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations based on these technical teachings disclosed in this invention without departing from the essence of this invention, and such modifications and combinations are still within the scope of protection of this invention.

Claims

1. A knee detection device based on multi-channel acoustic information, characterized by, The device includes a wearable carrier (1) and a sensor array (2) mounted on the wearable carrier; the sensor array (2) includes a first acoustic sensor unit (21), a second acoustic sensor unit (22), a third acoustic sensor unit (23), a fourth acoustic sensor unit (24), a fifth acoustic sensor unit (25), a sixth acoustic sensor unit (26), a seventh acoustic sensor unit (27), an eighth acoustic sensor unit (28), a ninth acoustic sensor unit (29), a tenth acoustic sensor unit (210), and an eleventh acoustic sensor unit (211); the first acoustic sensor unit (21), the second acoustic sensor unit (22), and the seventh acoustic sensor unit (27) are located in the defined area (11) of the wearable carrier. The third acoustic sensor unit (23) and the fourth acoustic sensor unit (24) are arranged symmetrically with respect to the vertical axis of symmetry of the inner edge of the wearable carrier (1). The fifth acoustic sensor unit (25) and the sixth acoustic sensor unit (26) are arranged symmetrically with respect to the vertical axis of symmetry. The fifth acoustic sensor unit (25) and the sixth acoustic sensor unit are located below the third acoustic sensor unit (23) and the fourth acoustic sensor unit (24), respectively. The eighth acoustic sensor unit (28), the ninth acoustic sensor unit (29), the tenth acoustic sensor unit (210) and the eleventh acoustic sensor unit (211) are located at the four corners of the wearable carrier definition area (11), respectively.

2. The multi-channel acoustic information based knee detection apparatus according to claim 1, wherein, The spacing between the first acoustic sensor unit (21) and the second acoustic sensor unit (22), the spacing between the third acoustic sensor unit (23) and the fourth acoustic sensor unit (24), and the spacing between the fifth acoustic sensor unit (25) and the sixth acoustic sensor unit (26) are 6-8 cm; the spacing between the seventh acoustic sensor unit (27) and the second acoustic sensor unit (22) is 6-8 cm; the spacing between the eighth acoustic sensor unit (28) and the ninth acoustic sensor unit (29), and the spacing between the tenth acoustic sensor unit (210) and the eleventh acoustic sensor unit (211) are 10-15 cm.

3. The multi-channel acoustic information based knee detection apparatus according to claim 1, wherein, When the wearable device is in the wearing state, the first acoustic sensor unit (21) and the second acoustic sensor unit (22) are located on the upper and lower sides of the patella, respectively; the third acoustic sensor unit (23) and the fourth acoustic sensor unit (24) are located on the left and right sides of the patella, respectively; the fifth acoustic sensor unit (25) and the sixth acoustic sensor unit (26) are located on the sides of the tibiofemoral joint, respectively; the seventh acoustic sensor unit (27) is located on the front side of the tibial head; the eighth acoustic sensor unit (28) and the ninth acoustic sensor unit (29) are located on the left and right sides of the tibia and at a distance of 5-10 cm from the tibiofemoral joint, respectively; and the tenth acoustic sensor unit (210) and the eleventh acoustic sensor unit (211) are located on the left and right sides of the femur and at a distance of 10-15 cm from the tibiofemoral joint, respectively.

4. The multi-channel acoustic information based knee detection apparatus according to any one of claims 1 to 3, characterized in that, The acoustic sensor unit includes a flexible circuit board and two microphones mounted on the flexible circuit board; both microphones on the flexible circuit board are connected to the main control unit.

5. The multi-channel acoustic information based knee detection apparatus according to claim 4, wherein, The main control unit uses a PAL, GAL, or FPGA programmable logic controller.

6. The multi-channel acoustic information based knee detection apparatus according to claim 4, wherein, It also includes inertial sensors or angle sensors.

7. The multi-channel acoustic information based knee detection apparatus according to claim 6, wherein, It also includes a first inertial sensor (3) and a second inertial sensor (4); the first inertial sensor (3) and the second inertial sensor (4) are arranged along the upper and lower edges of the vertical axis of symmetry of the wearable carrier (1) within the defined area (11) of the wearable carrier.

8. The multi-channel acoustic information based knee detection apparatus according to claim 7, wherein, The first inertial sensor (3) and the second inertial sensor (4) are both connected to the main control unit.

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