Microneedle array device for skin

Abstract

The invention relates to the technical field of medical instruments, in particular to a microneedle array device for skin. Comprising a shell, and the array assembly comprises a microneedle assembly and a driving assembly used for driving the microneedle assembly; the guide assembly is used for guiding the movement of the microneedle array; the detection assembly is provided with a high-frequency ultrasonic sensor and used for detecting the skin thickness. The data acquisition module acquires thickness information, and the data analysis module determines the target penetration depth of the microneedle and generates a control instruction according to the thickness information. And the microneedle driving module drives the microneedle to act after receiving the instruction. The penetration feedback module detects the actual penetration depth in real time and judges whether the actual penetration depth reaches the standard or not. And when the penetration is unqualified, the strategy regulation and control unit adjusts the driving strategy according to the deviation direction between the actual depth and the target depth, so that accurate and controllable micro-needle penetration is realized. The problems that medicine liquid cannot be effectively injected according to different skin thicknesses, and whether potential safety hazards exist in the actual penetration depth of the skin or not cannot be found in time are solved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more particularly to a microneedle array device for skin. Background Technology

[0002] Microneedle array technology, as an innovative transdermal drug delivery and skincare method, effectively overcomes the barrier effect of the stratum corneum by creating micron-sized physical channels, significantly improving drug penetration efficiency and stimulating collagen regeneration. It has been widely used in fields such as vaccination, wrinkle removal, and scar treatment.

[0003] However, existing microneedle array devices, whether manual rollers, electric pens, or stamp-type devices, generally share a common defect: their insertion depth or force is usually preset manually by the user or operated based on experience, lacking intelligent adaptive adjustment capabilities. The skin thickness varies significantly in different parts of the human body, and even in the same area, it varies among different individuals and at different ages. Fixed insertion parameters cannot adapt to such complex individual and site-specific differences, resulting in the following problems: (1) In areas with thinner skin, excessively deep insertion may cause pain, bleeding, or even damage to subcutaneous tissue, posing a safety hazard; (2) In areas with thicker skin, excessively shallow insertion may prevent the medication from reaching the effective depth, resulting in poor or completely ineffective treatment; (3) The entire operation process is highly dependent on the operator's professional level and experience, and its use in home or non-professional settings carries high risks and the effectiveness is difficult to guarantee.

[0004] Currently, although some high-end devices have attempted to incorporate depth adjustment functions, most still rely on the operator's subjective judgment, lacking objective, real-time skin parameters as a basis for decision-making, and are unable to provide real-time feedback and dynamic adjustments during the insertion process. Therefore, developing a microneedle array device that can automatically sense skin characteristics, make intelligent decisions and execute precisely, and possess closed-loop feedback adjustment capabilities is of urgent need and significant importance for improving treatment effects, ensuring operational safety, and expanding application scenarios.

[0005] Chinese Patent Publication No. CN116726373A discloses a microneedle array, including a main body and a connector detachably connected to the lower part of the main body. The connector includes a movable seat that can move up and down within the connector, and several microneedles are disposed below the movable seat. A movable component that can move up and down is disposed within the main body. An ultrasonic probe for detecting the thickness of the dermis and epidermis is disposed on the bottom surface of the connector. When the connector is connected to the lower part of the main body, the movable component can drive the movable seat and microneedles to move downward a corresponding distance according to the thickness measured by the ultrasonic probe. This not only allows for real-time adjustment of the length of the inserted microneedles according to the thickness of the skin, making the microneedle insertion process more comfortable and reducing the user's pain while achieving subcutaneous injection; but also allows for the replacement of microneedles by simply replacing the connector when they are damaged, making maintenance simple and convenient.

[0006] Therefore, it can be seen that the aforementioned microneedle array does not specify the required insertion depth for different skin thicknesses, nor does it compare the actual insertion depth of several microneedles with the target insertion depth to determine whether the actual insertion depth is qualified. This results in the inability to effectively inject medication according to different skin thicknesses and the inability to promptly detect any safety hazards in the actual insertion depth. Summary of the Invention

[0007] Therefore, the present invention provides a microneedle array device for the skin to overcome the problems in the prior art that it is impossible to effectively inject drugs according to different skin thicknesses and cannot detect in time whether there are safety hazards in the actual puncture depth into the skin.

[0008] To achieve the above objectives, the present invention provides a microneedle array device for skin. It includes: shell; An array assembly, comprising a microneedle assembly and a driving assembly for driving the microneedle assembly; The guide component is used to provide guidance for the movement of the microneedle array; The detection component includes a high-frequency ultrasonic sensor disposed at the bottom of the microneedle array for detecting the skin thickness at the contact site; A data acquisition module is used to acquire the thickness of the skin at the contact site detected by the high-frequency ultrasonic sensor; The data analysis module is used to determine the insertion depth of the drive motor driving several micro-particles into the skin based on the skin thickness at the contact site obtained by the data acquisition module, and to generate control commands. The microneedle driving module is used to receive control commands from the data analysis module and drive the motor to control a plurality of microneedles to perform piercing actions on the skin. The insertion feedback module is used to detect the insertion depth of the microneedles inserted into the skin in real time, and determine whether the insertion action of the microneedles into the skin is qualified based on the difference between the actual insertion depth and the target insertion depth. The strategy control unit is used to determine, based on the deviation direction between the actual insertion depth and the target insertion depth, whether to increase or decrease the drive current of the drive motor to control the microneedle drive module when the skin insertion action of a number of microneedles is deemed unqualified.

[0009] Furthermore, the data analysis module determines, based on the thickness of the skin at the contact point obtained by the data acquisition module being less than or equal to a preset thickness, that the drive motor drives several micro-prongs to perform a first insertion depth on the skin, with the product of the skin thickness and a first safety factor as the first insertion depth, and generates control commands.

[0010] Furthermore, the data analysis module determines, based on the data acquisition module's finding that the skin thickness at the contact point is greater than a preset thickness, that the motor drives several of the micro-targets to perform a second insertion depth on the skin, using the product of the skin thickness and a second safety factor as the second insertion depth, and generates control commands.

[0011] Furthermore, the insertion feedback module detects the insertion depth of the microneedles into the skin in real time, and determines that the insertion action of the microneedles into the skin is unqualified based on the actual insertion depth and the absolute difference between the actual insertion depth and the depth less than the target insertion depth and the absolute difference greater than the preset absolute difference. Wherein, the absolute difference is the difference between the actual penetration depth and the target penetration depth.

[0012] Furthermore, the insertion feedback module detects the insertion depth of the microneedles into the skin in real time, and determines that the insertion action of the microneedles into the skin is unqualified based on the actual insertion depth and the absolute difference between the actual insertion depth and the target insertion depth and the absolute difference is greater than a preset absolute difference.

[0013] Furthermore, the strategy control module is used to determine, under the condition that the microneedles fail to perform the skin insertion action, to increase the drive current of the drive motor to control the microneedle drive module based on the negative deviation direction of the deviation between the actual insertion depth and the target insertion depth.

[0014] Furthermore, the strategy control module is used to control the microneedle drive module by reducing the drive current of the drive motor when it is determined that the microneedles are not performing the skin insertion action properly, based on the fact that the deviation direction between the actual insertion depth and the target insertion depth is positive.

[0015] Furthermore, the microneedle assembly includes a plurality of microneedles and a microneedle mounting groove disposed on the upper part of the plurality of microneedles for mounting the plurality of microneedles.

[0016] Furthermore, the driving assembly includes a return spring disposed on the upper part of the microneedle mounting slot, and a drive motor for driving the movement of a plurality of microneedles is disposed on the upper part of the return spring.

[0017] Furthermore, the guiding assembly includes a pair of guide blocks disposed on the inner sidewall of the housing and a pair of guide grooves disposed on both sides of the microneedle mounting groove.

[0018] Compared with the prior art, the beneficial effects of the present invention are that it measures the precise skin thickness of the treatment site in real time and non-invasively using a high-frequency ultrasonic sensor, and intelligently calculates the optimal insertion depth based on this data. This makes each insertion operation customizable, completely solving the problem of ineffective or over-treatment caused by differences in skin thickness. It ensures that the drug or stimulation energy can accurately act on the target skin layer, thereby greatly improving the reliability and consistency of the treatment effect.

[0019] Furthermore, this invention introduces a safety factor mechanism, employing a first safety factor of 0.1-0.3 for thin skin and a second safety factor of 0.3-0.5 for thick skin. This ensures that the calculated target insertion depth is absolutely less than the total skin thickness, forming the first safety barrier. The preset absolute difference in the closed-loop feedback system forms the second safety barrier, preventing accidental excessive insertion due to execution errors. This dual safety mechanism greatly reduces the risk of puncturing blood vessels, nerves, or deep tissues, making the device very safe even for non-professionals to use in a home environment.

[0020] Furthermore, this invention goes beyond the simple "perception-execution" open-loop model and constructs a complete "perception-decision-execution-feedback-re-decision" closed-loop control system. When the initial insertion depth is unqualified, the strategy control unit can automatically formulate and execute the control strategy according to the direction of deviation until the insertion depth is qualified. This intelligent self-correction capability reduces the dependence on external operators and is a key step for microneedle devices towards full automation.

[0021] Furthermore, the insertion feedback module and qualification determination mechanism in this invention provide a quantitative quality assessment standard for each insertion action, which not only ensures the quality of a single operation, but also ensures that the operation at all points in the entire treatment area is highly consistent, thereby avoiding the effect fluctuation caused by uneven operation force, and laying the foundation for repeatable and standardized treatment effects.

[0022] Furthermore, the microneedle array device in this invention automatically completes the most complex tasks of thickness detection, depth calculation, and force control, requiring only the user's mobile device. The operation is simple and intuitive, requiring no professional training or complex settings. Simultaneously, because the insertion depth is precisely controlled within a safe and effective range, pain and postoperative adverse reactions are significantly reduced, greatly improving the user experience and comfort, which is conducive to the promotion and popularization of this technology.

[0023] Furthermore, this invention demonstrates the system's adaptability to various complex situations through different control strategies employed by the strategy control module for different deviation directions. Whether the execution deviation is caused by abnormal skin elasticity, changes in mechanical resistance, or other factors, the system can make targeted and effective compensation adjustments, ensuring the reliability of the final output and improving the robustness of the entire device under different skin conditions. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a microneedle array device for skin according to an embodiment of the present invention; Figure 2 This is a lower view schematic diagram of the microneedle array device for skin according to an embodiment of the present invention; Figure 3 This is a functional block diagram of a microneedle array device for skin according to an embodiment of the present invention; Figure 4 This is a logic block diagram illustrating how the piercing depth is determined based on skin thickness according to an embodiment of the present invention. Figure 5 This is a logic block diagram illustrating how an embodiment of the present invention determines whether the skin insertion action of a number of microneedles is qualified based on the absolute difference between the actual insertion depth and the target insertion depth. Figure 6 This is a logic block diagram illustrating how the control strategy for the microneedle driving module is determined based on the deviation direction between the actual insertion depth and the target insertion depth in an embodiment of the present invention. In the diagram, 1 - outer shell, 2 - return spring, 3 - several microneedles, 4 - guide block, 5 - high-frequency ultrasonic camera, 6 - microneedle protective cover, 7 - guide groove, 8 - microneedle mounting groove. Detailed Implementation

[0025] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0026] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0027] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0028] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] Please see Figures 1 to 3 As shown, Figure 1 This is a schematic diagram of the structure of a microneedle array device for skin according to an embodiment of the present invention; Figure 2 This is a lower view schematic diagram of the microneedle array device for skin according to an embodiment of the present invention; Figure 3 This is a functional block diagram of a microneedle array device for skin according to an embodiment of the present invention.

[0030] The microneedle array device for skin according to embodiments of the present invention includes: Outer shell 1; An array assembly, comprising a microneedle assembly and a driving assembly for driving the microneedle assembly; The guide component is used to provide guidance for the movement of the microneedle array; The detection component includes a high-frequency ultrasonic sensor disposed at the bottom of the microneedle array for detecting the skin thickness at the contact site; A control execution unit, connected to the detection component, includes: A data acquisition module is used to acquire the thickness of the skin at the contact site detected by the high-frequency ultrasonic sensor; A data analysis module, connected to the data acquisition module, is used to determine the insertion depth of the drive motor driving several micro-particles into the skin based on the skin thickness at the contact site obtained by the data acquisition module, and to generate control commands. A microneedle driving module, which is connected to the data analysis module, is used to receive control commands from the data analysis module and drive a motor to control a plurality of microneedles to perform puncture actions on the skin. The insertion feedback module is connected to the microneedle drive module to detect the insertion depth of the microneedles into the skin in real time, and to determine whether the insertion action of the microneedles into the skin is qualified based on the difference between the actual insertion depth and the target insertion depth. The strategy control unit, which is connected to the insertion feedback module and the microneedle driving module, is used to determine the control strategy of the microneedle driving module based on the deviation direction between the actual insertion depth and the target insertion depth under unqualified conditions.

[0031] In this embodiment of the invention, the microneedle assembly includes a plurality of microneedles 3, and also includes a microneedle mounting groove 8 disposed on the upper part of the plurality of microneedles 3 for mounting the plurality of microneedles 3.

[0032] In this embodiment of the invention, the driving component includes a reset spring 2 disposed on the upper part of the microneedle mounting groove 8, and a driving motor (not shown in the figure) is disposed on the upper part of the reset spring 2 for driving the movement of a plurality of microneedles 3.

[0033] In this embodiment of the invention, the guiding component includes a pair of guide blocks 4 disposed on the inner sidewall of the housing 1 and a pair of guide grooves 7 disposed on both sides of the microneedle mounting groove 8.

[0034] In this embodiment of the invention, the outer shell 1 further includes a microneedle protective cover 6 for protecting the plurality of microneedles 3 in a non-working state.

[0035] Specifically, the microneedle array device in this invention automatically completes the most complex tasks of thickness detection, depth calculation, and force control, requiring only the user's mobile device. The operation is simple and intuitive, requiring no professional training or complex settings. Furthermore, because the insertion depth is precisely controlled within a safe and effective range, pain and postoperative adverse reactions are significantly reduced, greatly improving the user experience and comfort, which is conducive to the promotion and popularization of this technology.

[0036] Please see Figure 4 As shown, Figure 4 This is a logic block diagram illustrating how the piercing depth is determined based on skin thickness according to an embodiment of the present invention.

[0037] In this embodiment of the invention, when the microneedle array device contacts human skin, the high-frequency ultrasonic sensor located at the bottom of the microneedle array immediately emits ultrasonic waves to the human skin at the contact site to detect the thickness of the skin at the contact site. The data acquisition module acquires the thickness of the human skin detected by the high-frequency ultrasonic sensor. At this time, the data analysis module determines the insertion depth of the microneedle drive motor driving several microneedles into the skin based on the comparison result between the thickness of the skin at the contact site acquired by the data acquisition module and a preset thickness, and generates control commands. If the thickness is less than or equal to the preset thickness, then the first insertion depth of the microneedle drive motor driving the microneedles into the skin is determined. If the thickness is greater than the preset thickness, then the microneedle drive motor drives several microneedles to a second insertion depth into the skin. In this embodiment of the invention, the preset thickness is based on clinical statistical data of skin thickness in different parts of the human body. The preset thickness ranges from 1.1 mm to 1.3 mm, and the preferred value in this invention is 1.2 mm. The preferred range and preferred value of the preset thickness can be determined according to the actual situation, and are not specifically limited here.

[0038] In this embodiment of the invention, the first insertion depth is the product of the skin thickness and the first safety factor. The first safety factor has a value range of 0.1-0.3, and is preferably 0.2. The first safety factor is used to convert the real-time measured skin thickness into an absolutely safe and effective insertion depth, ensuring that the insertion depth is always a small part of the total skin thickness.

[0039] In this embodiment of the invention, the second insertion depth is the product of the skin thickness and the second safety factor. The second safety factor has a value range of 0.3-0.5, and the preferred value in this invention is 0.4. The second safety factor is used to convert the real-time measured skin thickness into an absolutely safe and effective insertion depth, ensuring that the insertion depth is always a small part of the total skin thickness.

[0040] In this embodiment of the invention, the thickness is obtained in real time by the high-frequency ultrasonic sensor.

[0041] Specifically, this invention uses a high-frequency ultrasonic sensor to measure the precise skin thickness of the treatment site in real time and non-invasively, and intelligently calculates the optimal insertion depth based on this data. This ensures that each insertion operation is customized, completely solving the problem of ineffective or over-treatment caused by differences in skin thickness. It also ensures that the drug or stimulation energy can accurately act on the target skin layer, thereby greatly improving the reliability and consistency of the treatment effect.

[0042] Specifically, this invention introduces a safety factor mechanism, employing a first safety factor of 0.1-0.3 for thin skin and a second safety factor of 0.3-0.5 for thick skin. This ensures that the calculated target insertion depth is absolutely less than the total skin thickness, forming the first safety barrier. The preset absolute difference in the closed-loop feedback system forms the second safety barrier, preventing accidental excessive insertion due to execution errors. This dual safety mechanism greatly reduces the risk of puncturing blood vessels, nerves, or deep tissues, making the device very safe even for non-professionals to use in a home environment.

[0043] Specifically, when the data analysis module determines the insertion depth of the microneedles driven by the microneedle drive motor into the skin, the data analysis module sends an execution command to the microneedle drive module. The microneedle drive module receives the control command from the data analysis module and drives the microneedle drive motor to control the microneedles to perform the insertion action into the skin.

[0044] Please see Figure 5 As shown, Figure 5 This is a logic block diagram illustrating how an embodiment of the present invention determines whether the skin insertion action of a number of microneedles is qualified based on the absolute difference between the actual insertion depth and the target insertion depth.

[0045] Under the condition that the microneedle driving module drives the microneedle driving motor to control a plurality of microneedles to perform the piercing action on the skin, the piercing feedback module detects the piercing depth of the plurality of microneedles piercing the skin in real time, and determines whether the piercing action of the plurality of microneedles on the skin is qualified based on the comparison result of the difference between the actual piercing depth and the target piercing depth and the preset difference. If the absolute difference between the actual insertion depth and the target insertion depth is less than a preset absolute difference, then the microneedles are deemed to have performed the skin insertion action correctly. If the actual insertion depth is less than the target insertion depth and the absolute difference is greater than the preset absolute difference, then it is determined that the microneedles are unqualified in performing the skin insertion action. If the actual insertion depth is greater than the target insertion depth and the absolute difference is greater than the preset absolute difference, then it is determined that the microneedles are unqualified in performing the skin insertion action. In this embodiment of the invention, the target insertion depth is the first insertion depth when the skin is thin and the second insertion depth when the skin is thick.

[0046] In this embodiment of the invention, the preset absolute difference is the difference between the actual penetration depth and the target penetration depth, and the value range is 0.04mm to 0.06mm. The preferred value is 0.05mm. The preferred range and preferred value of the absolute difference can be determined according to the actual situation, and are not specifically limited here.

[0047] Please see Figure 6 As shown, Figure 6 This is a logic block diagram illustrating how the control strategy for the microneedle driving module is determined based on the deviation direction between the actual insertion depth and the target insertion depth, according to an embodiment of the present invention.

[0048] Specifically, when the insertion feedback module determines that several of the microneedles have failed to perform the skin insertion action correctly, the strategy control module determines a control strategy for the microneedle driving module based on the deviation direction between the actual insertion depth and the target insertion depth. If the actual insertion depth is less than the target insertion depth, the deviation direction is negative, and a first control strategy for the microneedle driving module is determined. If the actual insertion depth is greater than the target insertion depth, then the deviation direction is positive, and a second control strategy for the microneedle drive module is determined. In this embodiment of the invention, the deviation direction is the sign of the difference between the actual penetration depth and the target penetration depth.

[0049] In this embodiment of the invention, when the actual insertion depth is less than the target insertion depth, the deviation direction is negative, indicating that the actual insertion depth of the microneedles into the skin is insufficient, and the medication cannot be injected into the target depth area of ​​the skin. At this time, the first control strategy is to increase the driving current of the drive motor to increase the insertion depth of the microneedles into the skin, that is, to increase the driving current of the drive motor to 1.2-1.4 times the rated driving current. The present invention preferably increases it to 1.3 times, thereby increasing the insertion depth of the microneedles into the skin and increasing the stroke of the microneedles.

[0050] In this embodiment of the invention, when the actual insertion depth is greater than the target insertion depth, the deviation direction is a positive deviation, indicating that the actual insertion depth of the microneedles into the skin is too large, and the drug injection area exceeds the target depth area in the skin. At this time, the second control strategy is to reduce the driving current of the driving motor to reduce the insertion depth of the microneedles into the skin, that is, to reduce the driving current of the driving motor to 0.8-0.9 times the rated driving current. The present invention preferably increases the value to 0.85 times, thereby reducing the insertion depth of the microneedles into the skin and reducing the stroke of the microneedles.

[0051] Specifically, the insertion feedback module and qualification judgment mechanism in this invention provide a quantitative quality assessment standard for each insertion action, which not only ensures the quality of a single operation, but also ensures that the operation at all points in the entire treatment area is highly consistent, thereby avoiding the effect fluctuation caused by uneven operation force, and laying the foundation for repeatable and standardized treatment effects.

[0052] Specifically, this invention demonstrates the system's adaptability to various complex situations through different control strategies employed by the strategy control module for different deviation directions. Whether the execution deviation is caused by abnormal skin elasticity, changes in mechanical resistance, or other factors, the system can make targeted and effective compensation adjustments, ensuring the reliability of the final output and improving the robustness of the entire device under different skin conditions.

[0053] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A microneedle array device for skin, characterized in that, include, shell; An array assembly, comprising a microneedle assembly and a driving assembly for driving the microneedle assembly; The guide component is used to provide guidance for the movement of the microneedle array; The detection component includes a high-frequency ultrasonic sensor disposed at the bottom of the microneedle array for detecting the skin thickness at the contact site; A data acquisition module is used to acquire the thickness of the skin at the contact site detected by the high-frequency ultrasonic sensor; The data analysis module is used to determine the insertion depth of the drive motor driving several micro-particles into the skin based on the skin thickness at the contact site obtained by the data acquisition module, and to generate control commands. The microneedle driving module is used to receive control commands from the data analysis module and drive the motor to control a plurality of microneedles to perform piercing actions on the skin. The insertion feedback module is used to detect the insertion depth of the microneedles inserted into the skin in real time, and determine whether the insertion action of the microneedles into the skin is qualified based on the difference between the actual insertion depth and the target insertion depth. The strategy control unit is used to determine, based on the deviation direction between the actual insertion depth and the target insertion depth, whether to increase or decrease the drive current of the drive motor to control the microneedle drive module when the skin insertion action of a number of microneedles is deemed unqualified.

2. The microneedle array device for skin according to claim 1, characterized in that, The data analysis module determines, based on the data acquisition module, that the thickness of the skin at the contact point is less than or equal to a preset thickness, to drive a number of micro-targets to perform a first insertion depth on the skin, using the product of the skin thickness and a first safety factor as the first insertion depth, and generates control commands.

3. The microneedle array device for skin according to claim 2, characterized in that, The data analysis module determines, based on the data acquisition module's finding that the skin thickness at the contact point is greater than a preset thickness, that the drive motor drives several micro-targets to perform a second insertion depth on the skin, using the product of the skin thickness and a second safety factor as the second insertion depth, and generates control commands.

4. The microneedle array device for skin according to claim 3, characterized in that, The insertion feedback module detects the insertion depth of the microneedles into the skin in real time, and determines that the insertion action of the microneedles into the skin is unqualified based on the actual insertion depth and the absolute difference between the actual insertion depth and the target insertion depth, which is greater than the preset absolute difference. Wherein, the absolute difference is the difference between the actual penetration depth and the target penetration depth.

5. The microneedle array device for skin according to claim 4, characterized in that, The insertion feedback module detects the insertion depth of the microneedles into the skin in real time, and determines that the insertion action of the microneedles into the skin is unqualified based on the actual insertion depth and the absolute difference between the actual insertion depth and the target insertion depth and the absolute difference is greater than a preset absolute difference.

6. The microneedle array device for skin according to claim 5, characterized in that, The strategy control module is used to control the microneedle drive module by increasing the drive current of the drive motor when it is determined that the actual insertion depth and the target insertion depth are negatively deviated under the condition that the microneedles fail to perform the skin insertion action.

7. The microneedle array device for skin according to claim 6, characterized in that, The strategy control module is used to control the microneedle drive module by reducing the drive current of the drive motor if the deviation direction between the actual insertion depth and the target insertion depth is positive when it is determined that the microneedle insertion action is unqualified.

8. The microneedle array device for skin according to claim 1, characterized in that, The microneedle assembly includes a plurality of microneedles and a microneedle mounting groove disposed on the upper part of the plurality of microneedles for mounting the plurality of microneedles.

9. The microneedle array device for skin according to claim 1, characterized in that, The drive assembly includes a reset spring disposed on the upper part of the microneedle mounting slot, and a drive motor for driving the movement of a plurality of microneedles is disposed on the upper part of the reset spring.

10. The microneedle array device for skin according to claim 1, characterized in that, The guiding assembly includes a pair of guide blocks disposed on the inner sidewall of the housing and a pair of guide grooves disposed on both sides of the microneedle mounting groove.

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