Flexible wearable device spherical tensile testing device

Abstract

The utility model relates to the field of medical instrument test, more particularly, relate to a kind of flexible wearable instrument spherical surface tensile test device, including the extension device of tension opening force and the device of testing stress. The test device when using, extension device is arranged in flexible wearable instrument, and extension device applies tension opening force, so that flexible wearable medical instrument is stretched or expanded by spherical surface, to simulate when being worn on the head of different users, it is stretched and expanded by different degrees, after impedance test, the device of testing stress corresponding above is used to test the tensile force suffered when it is stretched and expanded by spherical surface, to test when human body actually wears flexible instrument, ensure that it is not easily torn or permanently deformed, guarantee the safety, comfort and long-term reliability when using, the device can detect whether the flexible wearable instrument produced is safe and effective, can also provide basis for horizontal comparison and improvement design, can also provide basis and train of thought for product research and development upgrade, instrument innovation.

Description

Technical Field

[0001] This utility model relates to the field of medical device testing, and more specifically, to a spherical tensile testing device for flexible wearable devices. Background Technology

[0002] Flexible wearable EEG recorders are used to collect and analyze brain electrical signals. They consist of a flexible headpiece and multiple electrodes mounted on it to cover the entire brain or specific brain regions, enabling high spatial resolution data acquisition and non-invasive detection of weak electrical signals generated by neuronal groups in the cerebral cortex. They have wide applications in healthcare, scientific research, and education. In healthcare, they can aid in the detection of epilepsy, brain injury, and sleep disorders. In scientific research, they can be used in cognitive neuroscience and psychology research, such as studying the brain mechanisms of attention, memory, and emotion. In industry, they can be used for fatigue warnings for pilots or drivers, and for monitoring the condition of personnel in high-risk positions.

[0003] The mechanical properties, impedance, and signal acquisition quality of flexible wearable EEG recorders are key factors in ensuring their stable, reliable, and safe operation in practical applications. These three factors are interrelated and jointly determine the overall performance of the EEG recorder.

[0004] Because human skin has homogeneous stretchability, flexible electrodes should also maintain good signal monitoring under homogeneous stretchability. Monitoring the stability of human physiological signals verifies the good deformability of the flexible electrodes. During use, the flexible wearable EEG recorder needs to be worn on the head to test its mechanical and electrical properties when stretched and expanded, as well as the quality of the acquired signals, to ensure stable, reliable, and safe operation in practical applications. Currently, there are many types of flexible wearable EEG recorders on the market, but there is no device for testing the mechanical properties of flexible wearable EEG recorders. Utility Model Content

[0005] The present invention aims to overcome at least one defect (deficiency) of the prior art and provide a spherical tensile testing device for flexible wearable devices to solve the problem of the lack of devices for testing the mechanical properties of flexible wearable devices in the current market.

[0006] The technical solution adopted by this utility model is a flexible wearable device for spherical tensile testing, which includes an expansion device capable of applying tension force and a device for testing stress.

[0007] The mechanical properties of flexible wearable devices are related to their safety, comfort, signal stability, and long-term reliability during use, and typically involve their mechanical strength, elasticity, and durability. By simulating the human body's activity while wearing the device, mechanical performance testing can verify whether the flexible wearable device can adaptively adjust and ensure that it is not easily torn or permanently deformed.

[0008] When in use, the expansion device is placed inside the flexible wearable medical device. The expansion device can apply an opening force, so that the flexible wearable device can be stretched and expanded in the same direction. The stress testing device is used to test the mechanical properties of the flexible wearable device when stretched and expanded.

[0009] Furthermore, the extension device is composed of a multi-lobed arc surface structure, and the multi-lobed arc surface structure is evenly distributed.

[0010] Flexible wearable devices are worn on the user's head. The extension device is designed to simulate the human head, consisting of a multi-lobed arc-shaped structure. Its shape more closely resembles the head, allowing the flexible wearable device to be stretched for more accurate measurements. The arc-shaped structure also ensures that the flexible wearable device is subjected to uniform stress across its various areas, preventing inaccurate test results caused by uneven stress distribution or premature damage due to stress concentration in localized areas.

[0011] Furthermore, the extension device is also provided with a support column, and the support column is provided with a spherical crown structure.

[0012] When the multi-lobed arc structure stretches and expands the flexible wearable device, the top of the flexible wearable device will be stretched into a plane. The spherical crown structure can support the top of the flexible wearable device and prevent it from becoming flat when stretched and expanded, thus making the measurement results more accurate.

[0013] Furthermore, the arc surface structure is a gradually changing arc-shaped surface that is wider in the middle and narrower at both ends.

[0014] Making the middle part of the arc-shaped structure wider is to provide a larger support surface, making the gap between adjacent arc-shaped structures smaller, and avoiding poor continuity of the spherical surface and stress concentration after expansion. Narrowing the two ends is to reduce interference between adjacent segments when the arc-shaped structure is closed.

[0015] Furthermore, the arc-shaped structure has 6-8 petals.

[0016] If the number of petals in the curved surface structure is too small, stress concentration and poor fit are likely to occur. For example, with only 4 petals, a "cross" shape is easily formed. When stretching and expanding flexible wearable devices, the shape between adjacent petals tends to form a plane, leading to stress concentration and poor fit. On the other hand, if the number of petals is too large, the structure becomes redundant, making the system complex, costly, and difficult to maintain. Setting 6-8 petals in the curved surface structure can better match the head circumference, reduce local wrinkles or gaps during expansion, and balance performance and complexity.

[0017] Furthermore, the stress testing device includes a test host and a stress sensor connected to the test host.

[0018] When in use, the stress sensor is placed on the outer surface of the flexible wearable device. When the extension device causes the flexible wearable device to stretch or expand, the test host can test the magnitude of the tensile force on the flexible wearable device through the stress sensor.

[0019] Furthermore, an impedance sensor is also connected to the test host.

[0020] Electrode impedance directly affects signal quality and system performance. During stretching and expansion, not only should the impedance of a single electrode be within a specified range, but the impedance of all electrodes should also be as consistent as possible. Excessive impedance will cause signal attenuation and increased noise, while impedance imbalance will result in large differences in signal amplitude between different channels, affecting spatial resolution and leading to signal distortion. Impedance testing can also reflect the contact state between the electrode surface and biological tissue. Therefore, impedance sensors are used to detect electrode impedance. In use, the impedance sensor is connected to the electrodes on a flexible wearable device to test the impedance values ​​of a single electrode and the balance of impedances across all electrodes when the flexible wearable device is stretched or expanded.

[0021] Furthermore, the expansion device is provided with a patch that can conduct analog signals.

[0022] When using flexible wearable devices, it is necessary to ensure the integrity of the signal transmission path. If the mechanical connection of the electrodes is unreliable, breakage or desoldering may occur during the isotropic stretching process, leading to problems such as signal interruption and waveform distortion. By using a patch that conducts analog signals, the electromechanical coupling performance of the flexible wearable device can be tested, that is, how mechanical deformation affects the integrity of the signal transmission path, and its structural defects can be exposed, such as cracked solder joints or broken connecting wires that cause signal interruption.

[0023] Furthermore, the patch capable of conducting analog signals is mounted on the expansion device via wires.

[0024] When in use, the patch is placed on the inner surface of the flexible wearable device and connected to the electrodes to simulate the contact between the scalp and the electrodes. Depending on the reason or usage, the position of the electrodes on the flexible wearable device will also be different. The patch is connected to the extension device through wires so that the patch can be moved to connect to the electrodes in different positions, which is suitable for different flexible wearable devices.

[0025] Furthermore, the extension device is provided with a fixing device.

[0026] When the testing device is in use, the flexible wearable device is attached to the extension device. When the extension device extends, the flexible wearable device may slide upward or fall off, which may affect the test accuracy or cause the test to fail. A fixing device is set on the extension device to prevent the flexible wearable device from sliding upward or falling off.

[0027] Compared with existing technologies, the beneficial effects of this utility model are as follows: By setting an expansion device capable of applying an opening force, the flexible wearable device is stretched or expanded by a spherical surface. A stress testing device is used to test the tensile force experienced by the flexible wearable device when stretched and expanded by the spherical surface, ensuring that it is not easily torn or permanently deformed, guaranteeing safety, comfort, and long-term reliability during use. The expansion device consists of a multi-lobed arc surface structure. When an opening force is applied, the flexible wearable device experiences uniform force in all areas, avoiding inaccurate test results due to uneven force distribution or premature damage caused by stress concentration in localized areas. The arc surface structure is designed as a gradually tapering arc surface, wider in the middle and narrower at both ends, to provide a larger support surface and reduce the gap between adjacent arc surface lobes, avoiding poor spherical continuity and stress concentration after expansion. The expansion device also includes a spherical crown structure to support the top of the flexible wearable device, preventing the top from becoming flat when stretched and expanded. The extension device also features patches that conduct analog signals, used to connect to electrodes on the inner surface of the flexible wearable device. By inputting analog signals to the patches, the electromechanical coupling performance of the flexible wearable device can be tested, i.e., how mechanical deformation affects the integrity of signal transmission, exposing structural defects. Multiple patches are provided and connected to the extension device via wires, allowing them to connect to electrodes at different locations and simulate the contact conditions between the electrodes and different areas of the scalp. The stress testing device includes a testing unit and a stress sensor. In use, the stress sensor is placed on the outer surface of the flexible wearable device. When the flexible wearable device is stretched or expanded, the testing unit can measure the magnitude of the tensile force applied to the flexible wearable device through the stress sensor. An impedance sensor is also connected to the testing unit to test the impedance value of a single electrode and the balance of impedances across all electrodes during stretching and expansion of the flexible wearable device, thereby detecting signal strength and quality. This testing device can be used for destructive testing of flexible wearable devices to test the ultimate tensile strength and mechanical-electrical coupling failure threshold of flexible wearable medical devices, thereby detecting whether the product meets the requirements and providing a basis for cross-sectional comparison and design improvement. Attached Figure Description

[0028] Figure 1 This is a structural diagram of the present invention.

[0029] Figure 2 A structural diagram showing the application of an opening force to the extension device.

[0030] Figure 3 A structural diagram of a gradually curved surface.

[0031] Figure 4 This is a structural diagram of the present invention in use. Detailed Implementation

[0032] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this utility model. To better illustrate the following embodiments, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable that those skilled in the art will find that some well-known structures and their descriptions may be omitted in the drawings. In the description of this utility model, it should be noted that terms such as front, back, left, and right indicate orientation or positional relationships based on the orientation or positional relationships shown in the drawings, or the orientation or positional relationships commonly used when the product is in use. These are merely for the convenience of describing this utility model or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as limiting the scope of this utility model.

[0033] like Figure 1 , Figure 2 As shown, this embodiment provides a uniform tensile testing fixture for flexible wearable medical devices, including an expansion device 1 capable of applying opening force and a stress testing device 2. The expansion device 1 consists of an eight-lobed arc-shaped structure 11. The expansion device 1 can be opened or closed under the control of a control device to apply opening force. The corners of the arc-shaped structure 11 are rounded to prevent damage to the flexible wearable medical device from right-angled edges. The arc-shaped structure 11 ensures uniform stress distribution across all areas of the flexible wearable device 3 during stretching and expansion, improving testing accuracy and preventing premature breakage or tearing due to stress concentration in localized areas. Figure 3 As shown, the arc-shaped structure 11 can be configured as a gradually tapering arc surface that is wider in the middle and narrower at both ends, in order to provide a larger support surface and make the gap between adjacent arc-shaped structures 11 smaller, avoiding poor spherical continuity and stress concentration after expansion. A support column 16 is provided in the center of the multi-lobed arc-shaped structure 11, and a spherical crown structure 15 is provided at the top of the support column 16. The spherical crown structure 15 ensures that the top of the flexible wearable medical device 3 remains arc-shaped when stretched and expanded. Without the support column 16 and the spherical crown structure 15, the top of the flexible wearable medical device 3 would be flat when stretched and expanded, affecting testing accuracy. The spherical crown structure 15 provides support for the top of the flexible wearable medical device 3, preventing it from becoming flat when stretched and expanded. A fixing device 12 is provided on the multi-lobed arc surface structure 11. The fixing device 12 is used to fix the lower part of the flexible wearable device 3 to prevent the flexible wearable device 3 from sliding up or falling off when the expansion device 1 applies an opening force, which would lead to inaccurate test results or test failure. The expansion device 1 is also provided with multiple patches 13 that can conduct analog signals. The patches 13 are connected to the expansion device 1 through wires 14, so that the position of the patches 13 can be moved so as to connect with the electrodes 31 on different flexible wearable devices 3 to test the electromechanical coupling performance of the flexible wearable device 3.

[0034] The stress testing device 2 includes a test host 21 and multiple sets of sensors 22 connected to the test host 21. Each set of sensors 22 includes a stress sensor 221 and an impedance sensor 222. The stress sensor 221 is used to test the tensile force on the flexible wearable device 3 during spherical stretching and expansion. The impedance sensor 222 is used to test the impedance of the electrodes 31 on the flexible wearable device 3 during the process, as well as the impedance balance of all electrodes 31.

[0035] like Figure 4 As shown, in use, the expansion device 1 is installed inside the flexible wearable device 3, and the lower edge of the flexible wearable device 3 is fixed to the fixing device 12 to prevent slippage. The stress sensor 221 is installed on the outer surface of the flexible wearable device 3. When the expansion device 1 applies an opening force, the flexible wearable device 3 is stretched and expanded, and the test host 21 tests the tensile force through the stress sensor 221. Simultaneously with the tensile force test, the impedance sensor 222 can also be connected to the electrode 31 on the flexible wearable device 3. The stress sensor 221 is positioned near the corresponding electrode 31. By stretching and expanding the flexible wearable device 3, the tensile force it experiences during stretching and expansion and the impedance of the electrode 31 are tested. Alternatively, while testing the tensile force, a patch 13 for conducting analog signals can be installed on the inner surface of the flexible wearable device 3 and connected to the electrode 31 to test the signal transmission during the stretching and expansion of the flexible wearable device 3.

[0036] Of course, the signal transmission of the flexible wearable device 3 during stretching and expansion, and the impedance value of the electrode 31 can also be tested simultaneously. Although both serve the reliability and data quality of the EEG signal acquisition system, they have different focuses. By inputting analog signals into the patch 13, the signal path performance is directly tested, and the impedance, signal attenuation, and crosstalk of the electrode-scalp interface are evaluated. This reflects the reliability of the complete conduction link of the signal from the scalp to the acquisition circuit, as well as the signal fidelity of the system during stretching and expansion, and detects the electromechanical coupling performance of the flexible wearable device 3. The impedance sensor 222 specifically monitors impedance. If only impedance is monitored, it is impossible to distinguish whether the signal degradation is due to poor contact or conductor damage; if only signal fidelity is tested, it is difficult to locate whether the problem is caused by mechanical deformation or changes in the physiological signal itself. Testing both simultaneously can cover the entire chain of detection from contact stability to signal transmission quality. Through this multi-dimensional monitoring and feedback mechanism, the flexible wearable device 3 can maintain acceptable signal quality under mechanical deformation, thereby meeting the reliability requirements of scientific research, clinical, or consumer applications. Simultaneous monitoring of impedance and signal fidelity is a core requirement for achieving equipment reliability. Its essence is to resolve the coupling contradiction between mechanical deformation (such as tension) and electrical performance (signal quality).

[0037] This testing device can be used for destructive testing of the flexible wearable device 3, that is, extending the flexible wearable device 3 to the point of destruction and testing the tensile force it experiences upon destruction. This tests the ultimate tensile strength of the flexible wearable device 3, evaluating its mechanical reliability, safety, and durability.

[0038] The flexible wearable device 3 can also be extended to simulated signals from the patch 13 where the electrode 31 cannot detect them, and the tensile force it experiences at this time can be tested. This test is used to evaluate its mechanical-electrical coupling failure threshold, that is, to determine when the flexible wearable device 3 will experience signal interruption due to structural damage under mechanical stress. By simultaneously monitoring tensile force and signal interruption, the causes of failure can be distinguished and improvement directions can be proposed. For example, when the signal drops suddenly but is not completely interrupted, the cause may be poor electrode contact, in which case the electrode elastic structure or conductive medium can be optimized; when the signal is completely interrupted but there is no visible damage, the cause may be internal breakage of the wire, such as solder joint detachment, in which case solder joint protection can be strengthened or flexible printed circuits can be used; when the signal interruption is accompanied by material breakage, the cause may be insufficient mechanical strength of the headband or wires, in which case high tensile strength materials can be used instead.

[0039] The device can also extend the flexible wearable device 3 to a certain set tension and test the change in its signal under this tension. This tests whether the flexible wearable device 3 can transmit signals normally under fixed deformation.

[0040] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the technical solution of this utility model, and are not intended to limit the specific implementation of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A flexible wearable device for spherical tensile testing, characterized in that, This includes an expansion device capable of applying tension and a device for testing stress; The extension device is composed of a multi-lobed arc surface structure, and the multi-lobed arc surface structure is evenly distributed. The device for testing stress includes a test host and a stress sensor connected to the test host.

2. The flexible wearable device spherical tensile testing device according to claim 1, characterized in that, The extension device is also provided with a support column, and the support column is provided with a spherical crown structure.

3. The flexible wearable device spherical tensile testing device according to claim 1, characterized in that, The arc surface structure is a gradually changing arc-shaped surface that is wider in the middle and narrower at both ends.

4. The flexible wearable device spherical tensile testing device according to claim 1, characterized in that, The arc-shaped structure has 6-8 petals.

5. The flexible wearable device spherical tensile testing device according to claim 1, characterized in that, An impedance sensor is also connected to the test host.

6. The flexible wearable device spherical tensile testing device according to any one of claims 1-5, characterized in that, The expansion device is equipped with a patch that can conduct analog signals.

7. The flexible wearable device spherical tensile testing device according to claim 6, characterized in that, The patch that can conduct analog signals is mounted on the expansion device via wires.

8. The flexible wearable device spherical tensile testing device according to claim 6, characterized in that, The expansion device is equipped with a fixing device.

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