Suction and adhesive composite contact head and regulating assembly for dynamic mechanical testing of body skin

Abstract

The application discloses a suction and adhesion composite contact head and a regulating assembly for in-vivo skin dynamic mechanical testing, and relates to the technical field of medical devices.The application comprises a mounting connector for connecting with a loading mechanism of an external skin dynamic mechanical testing device; and a rigid shell connected with the mounting connector and defining a negative pressure distribution space.The application improves the dynamic coupling stability between the contact head and the skin through the combined effect of negative pressure suction, flexible compliance and adhesion attachment, realizes negative pressure distribution through a microporous suction interface and a vacuum distribution cavity, adapts to different curvature skin surfaces through a flexible compliance layer, improves the adaptability of testing of different human body parts, suppresses micro-slippage in the tangential dynamic loading process through an adhesion interface layer, makes the initial conditions of testing and the interface state in the testing process more controllable through preloading control and optional closed-loop negative pressure regulation, and thus improves the accuracy and repeatability of in-vivo skin dynamic mechanical testing data.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, and in particular relates to a suction and adhesion composite contact head and control components for dynamic mechanical testing of human skin. Background Technology

[0002] Skin is the largest soft tissue organ in the human body, exhibiting a distinct multi-layered structure, viscoelastic characteristics, and individual variability. With the increasing demand for skin aging assessment, wound repair evaluation, medical aesthetic efficacy assessment, soft tissue digital twin modeling, and personalized health monitoring, reliable measurement of in vivo skin mechanical properties is of great significance. Dynamic mechanical analysis can obtain the skin's response characteristics under different frequencies or loading conditions through periodic loading. Compared to simple static or quasi-static testing, it is more suitable for characterizing the skin's dynamic mechanical properties such as elasticity, viscosity, damping, and phase response.

[0003] In vivo dynamic mechanical testing of skin typically requires transmitting the motion and force of the loading mechanism to the skin surface and simultaneously acquiring the skin response. However, the skin surface is not an ideal rigid plane, but a complex biological interface with curvature, texture, lipids, moisture, and local compliance. During dynamic tangential loading, problems such as microslippage, local desorption, edge stress concentration, uneven contact pressure distribution, and changes in interfacial damping can easily occur between the contact head and the skin. These interfacial problems directly affect the amplitude, phase, and repeatability of the influence and displacement signals, thus leading to deviations in the inversion of skin dynamic mechanical parameters.

[0004] Existing contact methods mostly employ rigid indenters, ordinary suction cups, adhesive patches, or simple mechanical clamping structures. Rigid indenters are prone to uneven local contact and edge concentration on curved skin surfaces; while ordinary suction cups can provide a certain degree of adhesion, they may still experience micro-slippage and unstable adhesion during tangential dynamic loading, especially in high-frequency or small-displacement amplitude measurements; simple adhesive patches can be affected by skin oils, moisture, sweat, or repeated testing, and it is difficult to precisely control the initial contact state. Therefore, existing technologies lack a composite contact interface structure that can simultaneously achieve adhesion stability, adhesion reliability, surface compliance, and controllable initial boundary conditions.

[0005] To address these issues, we provide a suction and adhesion composite contact head and control components for in vivo skin dynamic mechanical testing. This enables the device to stably transmit the mechanical input of the testing device to the skin under the combined action of normal preload and tangential dynamic loading, while reducing interface slippage and signal distortion, thereby improving the reliability of in vivo skin dynamic mechanical testing. Summary of the Invention

[0006] The purpose of this invention is to provide an adsorption-adhesion composite contact head and control components for dynamic mechanical testing of in vivo skin, which solves the problems of interface slippage, unstable adsorption, uneven contact pressure distribution, poor surface adaptability, and mechanical signal distortion that easily occur between the contact head and the skin in existing dynamic mechanical testing of skin.

[0007] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution.

[0008] This invention relates to an adsorption / adhesion composite contact head and control assembly for dynamic biomechanical testing of human skin, comprising: Mounting connectors are used to connect to the loading mechanism of an external skin dynamic mechanical testing device; A rigid housing is connected to the mounting connector and defines a negative pressure distribution space. The negative pressure adsorption system includes a vacuum interface for connecting to an external negative pressure source, a vacuum distribution cavity disposed within the rigid housing, and a microporous adsorption interface disposed on the skin contact side. An interface control structure is disposed between the microporous adsorption interface and the skin. The interface control structure includes a flexible compliance layer and an adhesive interface layer. The microporous adsorption interface is connected to the vacuum distribution cavity and is configured to transmit negative pressure to a portion of the interface control structure in a distributed manner. The flexible compliant layer is configured to undergo compliant deformation under normal preload to compensate for the curvature difference or height difference with the skin surface; The adhesive interface layer is disposed on the skin-facing side of the flexible compliant layer and is configured to form a releasable adhesive interface with the skin. Under tangential dynamic load, the negative pressure adsorption system, the flexible compliance layer, and the adhesive interface layer together form a composite interface coupling structure that combines normal retention, curved surface fit, and shear transfer to suppress the relative slippage between the contact head and the skin.

[0009] The flexible compliance layer can be made of silicone, thermoplastic polyurethane, elastomer, hydrogel, porous elastic material or composite material thereof. The flexible compliance layer can be set with different thicknesses, hardness and shapes according to different test sites to adapt to skin areas with different curvatures and different softness and hardness, such as the forearm, face, soles of the feet, abdomen, etc. The adhesive interface layer can be a replaceable biocompatible interface layer, such as hydrogel patch, medical adhesive membrane, silicone gel layer, low-residue medical adhesive layer or microstructure biomimetic adhesive layer. Through the replaceable design, the risk of cross-contamination can be reduced, and different adhesion strengths or interface materials can be selected according to different skin conditions.

[0010] The present invention is further configured such that the microporous adsorption interface is provided with a plurality of through micropores, microgrooves and microchannels, all of which are connected to the vacuum distribution cavity to form a distributed negative pressure adsorption effect in the skin contact area.

[0011] The present invention is further configured such that the vacuum distribution cavity is at least one of an annular vacuum cavity, a radial distribution cavity, or a multi-zone vacuum cavity.

[0012] Under tangential dynamic load, the negative pressure adsorption system, flexible compliance layer and adhesive interface layer together form a composite interface coupling structure that combines normal retention, curved surface fit and shear transfer, thereby suppressing the relative slippage between the contact head and the skin.

[0013] The present invention is further configured such that the vacuum distribution cavity can also be configured as a multi-zone vacuum cavity, the multi-zone vacuum cavity including two or more negative pressure regions that can be independently connected, independently opened and closed, or independently adjusted, so as to regulate the adsorption intensity or pressure distribution of different contact regions.

[0014] The present invention is further configured such that the flexible compliant layer is made of silicone, thermoplastic polyurethane, elastomer, hydrogel, porous elastic material or composite material thereof.

[0015] The present invention is further configured such that the adhesive interface layer is a replaceable biocompatible interface layer, which includes at least one of hydrogel patch, medical adhesive membrane, silicone gel layer, low-residue medical adhesive layer or microstructure biomimetic adhesive layer.

[0016] The present invention is further configured such that the flexible conforming layer and the adhesive interface layer are provided with ventilating holes, ventilating grooves, edge air guiding channels or porous structures communicating with the microporous adsorption interface, so that negative pressure can be applied to the adhesive interface layer, the skin surface or the interface area between the two.

[0017] The present invention is further configured to include a preload control structure, the preload control structure being used to limit the initial compression amount, initial contact pressure, or initial adhesion state between the contact head and the skin, the preload control structure including at least one of a mechanical limiting member, an elastic pre-compression member, a pressure sensor, or a displacement sensor.

[0018] The preload control structure can be a mechanical limiter, an elastic preload component, a pressure sensor, a displacement sensor, or a combination thereof. By using a preload control structure, the initial mechanical boundary conditions between the contact head and the skin can be kept consistent at the start of each test, thereby improving the comparability of data between multiple tests.

[0019] The present invention is further configured to include an interface state detection unit, a negative pressure adjustment unit, and a loading mechanism. The interface state detection unit is used to detect at least one of contact pressure, negative pressure value, tangential force, interface slippage, or displacement response. The negative pressure adjustment unit is used to adjust the adsorption intensity of the negative pressure adsorption system according to the detection result of the interface state detection unit. The loading mechanism is used to apply a tangential dynamic load to the contact head.

[0020] The negative pressure regulating unit can adjust the adsorption intensity of the negative pressure adsorption system according to the interface state detection results, so that the contact head maintains a stable contact state during dynamic loading. When insufficient contact pressure, negative pressure drop or abnormal response waveform is detected, the negative pressure regulating unit can increase the adsorption intensity or issue a test abnormality prompt.

[0021] The invention is further configured such that the control component is used in conjunction with the loading mechanism and the detection mechanism, the detection mechanism is used to collect mechanical response signals, and the control component enables the loading mechanism and the skin to form a stable and repeatable interfacial mechanical coupling during the test.

[0022] This invention offers the following advantages: Through the combined effects of negative pressure adsorption, flexible compliance, and adhesive adhesion, it improves the dynamic coupling stability between the contact head and the skin; negative pressure distribution is achieved through a microporous adsorption interface and a vacuum distribution cavity, reducing local stress concentration and local desorption; the flexible compliance layer adapts to skin surfaces with different curvatures, improving the adaptability to testing different human body parts; the adhesive interface layer suppresses micro-slippage during tangential dynamic loading, improving the phase stability of force and displacement signals; and preload control and optional closed-loop negative pressure adjustment make the initial test conditions and interface state during testing more controllable, thereby improving the accuracy and repeatability of in vivo skin dynamic mechanical test data. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0024] Figure 1 This is a schematic cross-sectional view of the overall structure of the suction and adhesion composite contact head and control components used for dynamic mechanical testing of human skin.

[0025] Figure 2 This is an exploded view of the structure of the suction and adhesion composite contact head and control components used for dynamic mechanical testing of human skin.

[0026] Figure 3 This is a comparative schematic diagram showing the interfacial mechanical behavior of an adsorption / adhesion composite contact head and control components used for dynamic mechanical testing of human skin under dynamic tangential loading conditions.

[0027] Figure 4This is a comparison diagram of failure states where slippage occurs under traditional interface conditions.

[0028] In the attached diagram: 101, mounting connector; 102, rigid shell; 2, negative pressure adsorption system; 103, vacuum interface; 104, vacuum distribution chamber; 105, microporous adsorption interface; 106, flexible compliant layer; 107, adhesive interface layer; 108, epidermal layer; 109, dermal layer; 110, skin contact side. Detailed Implementation

[0029] The technical solutions of the present invention will be described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present invention, and not all embodiments.

[0030] Example 1: Please refer to Figures 1-4 This invention relates to an adsorption / adhesion composite contact head and control assembly for dynamic biomechanical testing of human skin, comprising: Mounting connector 101 is used to connect to the loading mechanism of the external skin dynamic mechanical testing device; A rigid housing 102 is connected to the mounting connector 101 and defines a negative pressure distribution space; The negative pressure adsorption system 2 includes a vacuum interface 103 for connecting to an external negative pressure source, a vacuum distribution cavity 104 disposed in a rigid housing 102, and a microporous adsorption interface 105 disposed on the skin contact side 110. An interface control structure is disposed between the microporous adsorption interface 105 and the skin. The interface control structure includes a flexible compliance layer 106 and an adhesion interface layer 107. The microporous adsorption interface 105 is connected to the vacuum distribution cavity 104 and is configured to transmit negative pressure to a portion of the interface control structure in a distributed manner. The flexible compliant layer 106 is configured to undergo compliant deformation under normal preload to compensate for the curvature difference or height difference between itself and the skin surface; An adhesive interface layer 107 is disposed on the skin-facing side of the flexible compliant layer 106 and is configured to form a releasable adhesive interface with the skin. Under tangential dynamic load, the negative pressure adsorption system 2, the flexible compliant layer 106, and the adhesive interface layer 107 together form a composite interface coupling structure that combines normal retention, curved surface fit, and shear transfer to suppress relative slippage between the contact head and the skin.

[0031] Specifically: 108 represents the epidermis, 109 the dermis, 110 the skin contact side, N the normal preload, and Q(t) the tangential dynamic load. Figure 3This is a schematic diagram comparing the interfacial mechanical behavior of an adsorption / adhesion composite contact head and control components used for dynamic mechanical testing of human skin under dynamic tangential loading conditions. Figure 4 This is a comparison diagram of failure states where slippage occurs under traditional interface conditions. Figure 3 To achieve stable, slip-free coupling, the contact head, under the action of normal preload N and tangential dynamic loading Q(t), achieves synchronous movement with the skin interface through the synergistic effects of adsorption force, conformation layer deformation, and adhesion layer. Shear transmission at the interface is continuous and stable, and signal transmission is complete. Figure 4 This is a comparison of failure states where slippage occurs under traditional interface conditions. Under the same normal preload N and tangential loading Q(t), due to insufficient interface coupling, relative slippage occurs between the contact layer and the skin, which is manifested as interface misalignment in the slippage direction. This causes distortion of mechanical signals and amplitude and time response distortion. The comparison of amplitude and time waveforms is used to characterize the difference in signal transmission quality.

[0032] Example 2: Please refer to Figures 1-4 Based on Example 1, the microporous adsorption interface 105 is provided with multiple through-holes, microgrooves and microchannels, all of which are connected to the vacuum distribution cavity 104 to form a distributed negative pressure adsorption effect in the skin contact area. The vacuum distribution cavity 104 is at least one of annular vacuum cavity, radial distribution cavity or multi-zone vacuum cavity. The vacuum distribution cavity 104 can also be configured as a multi-zone vacuum cavity. The multi-zone vacuum cavity includes two or more negative pressure areas that can be independently connected, independently opened and closed or independently adjusted to regulate the adsorption intensity or pressure distribution of different contact areas. The flexible compliant layer 106 is made of silicone, thermoplastic polyurethane, elastomer, hydrogel, porous elastic material or composite material thereof.

[0033] Specifically: the mounting connector 101 can be connected by thread, snap-fit, clamp or flange so that the contact head assembly can be disassembled, replaced and cleaned.

[0034] The rigid housing 102 forms the main body of the contact head, and a vacuum distribution chamber 104 is provided inside it. The vacuum interface 103 is provided on one side of the rigid housing 102 for communication with an external vacuum pump, negative pressure generator or negative pressure regulating device. When the external negative pressure source is started, the negative pressure enters the vacuum distribution chamber 104 through the vacuum interface 103 and is distributed to the skin contact area through the microporous adsorption interface 105. The rigid housing 102 can be made of metal, high-strength plastic, resin or composite material to ensure that the contact head has sufficient structural rigidity during dynamic loading and to avoid the deformation of the housing itself from affecting the transmission of mechanical signals.

[0035] The microporous adsorption interface 105 is disposed on the side of the rigid shell 102 facing the skin. Its surface is provided with multiple micropores, microgrooves or microchannels. The micropores, microgrooves or microchannels are connected to the vacuum distribution cavity 104. Through the microporous adsorption interface 105, the negative pressure can act in a distributed manner in the contact area, avoiding the problem of strong local adsorption and weak peripheral adsorption caused by the traditional single adsorption port. In one embodiment, the microporous adsorption interface 105 can be set as a circular, elliptical, annular or rectangular plate structure. The micropores can be arranged in an array, concentric ring, radial or non-uniform manner. For skin areas with large curvature, the micropore density can be appropriately increased at the edge of the contact area to improve the edge adhesion stability.

[0036] A flexible compliant layer 106 is disposed between the microporous adsorption interface 105 and the adhesive interface layer 107. The flexible compliant layer 106 can absorb the geometric mismatch between the rigid shell 102 and the skin surface, so that the contact head can better fit the skin surface with different curvatures or different softness and hardness. The flexible compliant layer 106 can also provide a certain interface buffering effect during tangential dynamic loading, reduce local stress concentration, and reduce skin indentation, discomfort or testing errors caused by local overpressure. The flexible compliant layer 106 can be a silicone layer, a thermoplastic polyurethane layer, an elastomer layer, a hydrogel layer, a porous elastic layer or a multi-layer composite elastic structure.

[0037] In one embodiment, the flexible compliant layer 106 is provided with vents, vents, edge air channels or porous structures that communicate with the microporous adsorption interface 105, so that negative pressure can be applied to the adhesion interface layer 107, the skin surface or the interface area between the two. In another embodiment, the central area of ​​the flexible compliant layer 106 is mainly used for mechanical compliance, and the edge area is provided with air channels or annular negative pressure paths to achieve negative pressure transmission without significantly weakening the overall shear transmission capacity of the flexible compliant layer 106.

[0038] Example 3: Please refer to Figures 1-4Based on Examples 1 and 2, the adhesive interface layer 107 is a replaceable biocompatible interface layer. This replaceable biocompatible interface layer includes at least one of a hydrogel patch, a medical adhesive membrane, a silicone gel layer, a low-residue medical adhesive layer, or a microstructured biomimetic adhesive layer. The flexible compliant layer 106 and the adhesive interface layer 107 are provided with vents, vent grooves, edge air channels, or porous structures communicating with the microporous adsorption interface 105, so that negative pressure can act on the adhesive interface layer 107, the skin surface, or the interface area between them. It also includes a preload control structure, which limits the initial compression amount, initial contact pressure, or initial adhesion state between the contact head and the skin. The control structure includes at least one of a mechanical limiting component, an elastic pre-compression component, a pressure sensor, or a displacement sensor. It includes an interface state detection unit, a negative pressure adjustment unit, and a loading mechanism. The interface state detection unit is used to detect at least one of contact pressure, negative pressure value, tangential force, interface slippage, or displacement response. The negative pressure adjustment unit is used to adjust the adsorption intensity of the negative pressure adsorption system 2 according to the detection results of the interface state detection unit. The loading mechanism is used to apply a tangential dynamic load to the contact head. The control component is used to cooperate with the loading mechanism and the detection mechanism. The detection mechanism is used to collect mechanical response signals. During the test, the control component enables a stable and repeatable interface mechanical coupling between the loading mechanism and the skin.

[0039] Specifically: The adhesive interface layer 107 is disposed on the side of the flexible conforming layer 106 facing the skin and is used to directly or indirectly contact the epidermal layer 108. The adhesive interface layer 107 can be a hydrogel patch, a medical adhesive membrane, a silicone gel layer, a low-residue medical adhesive layer, or a microstructure biomimetic adhesive layer. The adhesive interface layer 107 does not undertake all the fixation functions alone, but forms a composite interface fixation mechanism together with negative pressure adsorption. Under the action of dynamic tangential loading Q(t), the adhesive interface layer 107 can improve the continuity of interfacial shear transmission and reduce microslippage, thereby ensuring the consistency between the movement of the contact head and the deformation of the skin surface.

[0040] Before testing, the operator attaches the adhesive interface layer 107 to the target skin area and applies a normal preload N to the contact head through a loading mechanism or preload control structure, causing the flexible compliant layer 106 to undergo appropriate compression deformation. Then, the negative pressure source is activated, so that the vacuum distribution chamber 104 and the microporous adsorption interface 105 form a controllable adsorption effect in the contact area. After the initial attachment and adsorption stabilization are completed, the external testing device applies a tangential dynamic load Q(t) to the mounting connector 101. This load is transferred to the skin surface through the rigid shell 102, the microporous adsorption interface 105, the flexible compliant layer 106 and the adhesive interface layer 107, so that the skin produces a dynamic mechanical response under controlled conditions.

[0041] like Figure 2As shown, a modular stacked structure can be adopted, with the mounting connector 101, rigid shell 102, vacuum distribution chamber 104, microporous adsorption interface 105, flexible compliance layer 106, and adhesive interface layer 107 assembled sequentially along the central axis. The vacuum distribution chamber 104 can be installed as an independent component between the rigid shell 102 and the microporous adsorption interface 105 to form an annular negative pressure distribution space. The microporous adsorption interface 105, flexible compliance layer 106, and adhesive interface layer 107 can be set as replaceable consumables or replaceable functional modules. For different test objects, flexible compliance layer 106 with different hardness or adhesive interface layer 107 with different adhesion strength can be replaced to obtain a suitable interface coupling state.

[0042] In another embodiment, the vacuum distribution chamber 104 can be configured as a multi-zone structure, with each zone connected to the vacuum interface 103 via an independent micro-valve, an independent negative pressure pipeline, or an independent flow resistance structure. Through multi-zone control, the contact head can maintain a relatively uniform adsorption state in areas with uneven skin, skin with large curvature, or uneven distribution of local pore oil. For example, when one side of the contact area is more prone to desorption due to curvature, the negative pressure intensity of the corresponding zone on that side can be increased. When the compression in the center of the contact area is too large, the negative pressure intensity of the central zone can be reduced or the adsorption force of the edge zones can be adjusted to improve the pressure distribution.

[0043] In another embodiment, the contact head assembly further includes a preload control structure, which may be an elastic element disposed on the mounting connector 101, a mechanical limiting ring disposed around the rigid housing 102, a pressure sensor, a displacement sensor or a combination thereof disposed inside or outside the contact head. The preload control structure is used to control the initial contact state between the contact head and the skin, so that the compression of the flexible compliance layer 106, the adhesion state of the adhesive interface layer 107 and the initial deformation of the skin surface are kept within a preset range at the beginning of each test. This can improve the repeatability of data between tests of the same subject at different times, and can also improve the comparability of test results between different subjects.

[0044] In another embodiment, the contact head assembly may further include an interface state detection unit and a negative pressure adjustment unit. The interface state detection unit may include a negative pressure sensor, a contact pressure sensor, a tangential force sensor, a displacement sensor, an optical displacement detection unit, or a resistive / capacitive interface contact detection unit. The negative pressure adjustment unit may include a miniature vacuum pump, a proportional valve, a solenoid valve, a flow limiter, or a controller. When the interface state detection unit detects insufficient negative pressure, abnormal contact pressure, abnormal tangential response waveform, or the appearance of a possible slip signal, the negative pressure adjustment unit can automatically adjust the negative pressure intensity to restore the contact stability state. This closed-loop adjustment method is particularly suitable for long-term dynamic testing, multi-frequency scanning testing, or testing scenarios where the skin surface state changes over time.

[0045] like Figure 3 As shown, when the contact head of the present invention is in a stable coupling state, the normal preload N causes the flexible compliant layer 106 and the adhesive interface layer 107 to form a bonded state with the epidermal layer 108. The negative pressure adsorption system 2 provides distributed adsorption force through the microporous adsorption interface 105, and the adhesive interface layer 107 provides auxiliary adhesion force. Under the action of the tangential dynamic load Q(t), the contact head and the skin surface maintain synchronous movement, and the shear force at the interface can be continuously transmitted. Therefore, the detected mechanical signal can reflect the skin response more completely.

[0046] like Figure 4 As shown, under traditional interface conditions, if the contact head relies solely on rigid contact, single adsorption, or low-stability attachment structures, relative slippage may occur between the contact layer and the skin under the action of tangential dynamic load Q(t). This slippage will cause the actual displacement or force transmitted to the skin to be less than the output value of the loading mechanism, and may introduce mechanical response waveform distortion, phase shift, or amplitude attenuation, thereby leading to deviations in the calculation of skin dynamic mechanical parameters. This invention reduces the above-mentioned slippage risk through a composite mechanism of adsorption, compliance, and attachment, making signal transmission more stable.

[0047] The contact head assembly of the present invention can be used in in vivo skin dynamic mechanical testing equipment, as well as in other soft tissue surface dynamic mechanical testing scenarios. The external testing device can be a linear motor, voice coil motor, piezoelectric actuator, servo motor, pneumatic actuator, or other loading mechanism capable of outputting dynamic load. The present invention does not limit the specific form of the loading mechanism. As long as the loading mechanism needs to apply dynamic mechanical load to the skin or soft tissue surface through the contact head, the contact head and control assembly of the present invention can be used.

[0048] In summary, this invention provides a composite contact interface solution suitable for in vivo skin dynamic mechanical testing by integrating a negative pressure adsorption system 2, a flexible compliance layer 106, an adhesion interface layer 107, and optional preload and closed-loop control structures into the contact head. This solution can improve the interface coupling stability in skin dynamic testing, reduce microslippage and signal distortion under tangential dynamic loading, and improve the accuracy, repeatability, and clinical applicability of measurement results.

[0049] The preferred embodiments of the present invention disclosed above are only for the purpose of illustrating the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation described herein. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can better understand and utilize the present invention.

Claims

1. A suction and adhesion composite contact head for dynamic mechanical testing of human skin, characterized in that, include: Mounting connector (101) is used to connect to the loading mechanism of the external skin dynamic mechanical testing device; A rigid housing (102) is connected to the mounting connector (101) and defines a negative pressure distribution space; The negative pressure adsorption system (2) includes a vacuum interface (103) for connecting to an external negative pressure source, a vacuum distribution cavity (104) disposed in the rigid housing (102), and a microporous adsorption interface (105) disposed at the bottom of the rigid housing (102). An interface control structure is disposed between the microporous adsorption interface (105) and the skin. The interface control structure includes a flexible compliance layer (106) and an adhesion interface layer (107). The microporous adsorption interface (105) is connected to the vacuum distribution cavity (104) and transmits negative pressure to a portion of the interface control structure in a distributed manner. The flexible compliant layer (106) is configured to undergo compliant deformation under normal preload to compensate for the curvature difference or height difference with the skin surface; The adhesive interface layer (107) is disposed on the side of the flexible compliant layer (106) facing the skin and is configured to form a releasable adhesive interface with the skin; Under tangential dynamic load, the negative pressure adsorption system (2), the flexible compliant layer (106) and the adhesive interface layer (107) together form a composite interface coupling structure that combines normal retention, curved surface fit and shear transfer, so as to suppress the relative slippage between the contact head and the skin. The microporous adsorption interface (105) is provided with multiple through-holes, microgrooves and microchannels, all of which are connected to the vacuum distribution cavity (104) to form a distributed negative pressure adsorption effect in the skin contact area. The flexible compliant layer (106) and the adhesive interface layer (107) are provided with ventilating holes, ventilating grooves, edge air guiding channels or porous structures that communicate with the microporous adsorption interface (105) so that negative pressure can be applied to the adhesive interface layer (107), the skin surface or the interface area between the two.

2. The suction and adhesion composite contact head for dynamic mechanical testing of human skin according to claim 1, characterized in that, The vacuum distribution cavity (104) is at least one of an annular vacuum cavity, a radial distribution cavity, or a multi-zone vacuum cavity.

3. The suction and adhesion composite contact head for dynamic mechanical testing of human skin according to claim 2, characterized in that, The vacuum distribution cavity (104) can also be configured as a multi-zone vacuum cavity, which includes two or more negative pressure regions that can be independently connected, independently opened and closed, or independently adjusted, so as to regulate the adsorption intensity or pressure distribution of different contact regions.

4. The adsorption-adhesion composite contact head for dynamic mechanical testing of human skin according to claim 1, characterized in that, The flexible compliant layer (106) is made of silicone, thermoplastic polyurethane, elastomer, hydrogel, porous elastic material or composite material thereof.

5. The adsorption-adhesion composite contact head for dynamic mechanical testing of human skin according to claim 1, characterized in that, The adhesive interface layer (107) is a replaceable biocompatible interface layer, which includes at least one of hydrogel patch, medical adhesive membrane, silicone gel layer, low-residue medical adhesive layer or microstructure biomimetic adhesive layer.

6. The adsorption-adhesion composite contact head for dynamic mechanical testing of human skin according to claim 1, characterized in that, It also includes a preload control structure for defining the initial compression, initial contact pressure or initial adhesion state between the contact head and the skin, the preload control structure including at least one of a mechanical limiter, an elastic preload member, a pressure sensor or a displacement sensor.

7. A control component for dynamic biomechanical testing of human skin, applied to the suction and adhesion composite contact head for dynamic biomechanical testing of human skin as described in any one of claims 1-6, characterized in that, It includes an interface state detection unit and a negative pressure adjustment unit. The interface state detection unit is used to detect at least one of contact pressure, negative pressure value, tangential force, interface slip or displacement response. The negative pressure adjustment unit is used to adjust the adsorption intensity of the negative pressure adsorption system (2) according to the detection result of the interface state detection unit. The loading mechanism is used to apply a tangential dynamic load to the contact head.

8. The control component for dynamic biomechanical testing of human skin according to claim 7, characterized in that, The control component is used in conjunction with the loading mechanism and the detection mechanism. The detection mechanism is used to collect mechanical response signals. During the test, the control component enables a stable and repeatable interfacial mechanical coupling between the loading mechanism and the skin.

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