Microneedle roller and water-light introduction instrument

Abstract

The application discloses a microneedle roller and a water-light guide instrument. The microneedle roller comprises a cylindrical roller body and a plurality of microcrystal plates. The roller body has axially opposite first and second ends and an outer circumferential surface connected between the two ends. The two ends are respectively provided with rotating shaft structures for forming rotating connection with a handle of the water-light instrument. A plurality of transverse grooves are arranged on the outer circumferential surface in a circumferential direction, and the groove bottoms are provided with mounting surfaces with a smaller curvature radius than the outer circumferential surface. Each microcrystal plate comprises a planar substrate and a microneedle array formed on one surface of the planar substrate. The planar substrate is attached to the mounting surface, so that the plurality of microcrystal plates are respectively embedded and fixed in the plurality of transverse grooves. The microneedle roller is rotatably connected to a handle shell to form a water-light guide instrument that can be rolled and operated. Part of the structure of the microneedle roller extends out of the handle shell to provide a piercing function. The microcrystal plates on the microneedle roller are assembled in a modular manner, which is accurate and stable in structure.

Description

Technical Field

[0001] This invention relates to the field of cosmetic microneedling technology, and more particularly to a microneedling roller and a water-light infusion device. Background Technology

[0002] A microneedle roller is a cosmetic device that promotes nutrient absorption by rolling and puncturing a large number of microneedles on the skin. In existing technologies, common microneedle rollers are manufactured by first injection molding a roller, then regularly pre-drilling tiny holes on its surface, and then manually or semi-automatically inserting and fixing single millimeter-sized solid microneedles vertically onto the roller surface one by one to form the roller.

[0003] This traditional "needle implantation" process has fundamental technical flaws. First, the assembly efficiency is extremely low. Due to the hundreds or thousands of microneedles and their tiny size, the insertion process is extremely time-consuming, severely restricting large-scale production efficiency. Second, the product yield is difficult to guarantee. During the insertion process, problems such as microneedle misalignment, inconsistent height, missing insertion, or damage are prone to occur, resulting in low yield and consistency, which in turn affects the performance and safety. Although existing technologies disclose the etching and growth of nano-microneedle arrays on silicon substrates, this is a method for manufacturing individual microneedle elements and does not solve the technical challenge of how to efficiently and reliably assemble these planar microneedle elements onto a three-dimensional roller surface. Directly wrapping a large-area planar substrate completely around a cylindrical surface encounters problems such as material bending stress and poor adhesion, making it unsuitable for direct application. Summary of the Invention

[0004] This invention provides a microneedle roller and a water-light infusion device to solve the problems of traditional microneedle rollers, which use individual microneedles inserted one by one onto the roller surface. These methods result in time-consuming assembly processes, low production efficiency, and difficulty in achieving large-scale automated production. Furthermore, the insertion of microneedles is prone to misalignment, inconsistent height, omissions, or damage, making it difficult to guarantee the consistency and yield of the finished microneedle array. Simultaneously, it addresses the compatibility challenges of directly attaching a pre-fabricated planar microneedle array substrate to the curved surface of the roller, which presents difficulties in adhesion and breakage. Through modular and rapid embedding of microchips, both high assembly efficiency and high product quality are fundamentally achieved.

[0005] This invention provides a microneedle roller, comprising: The cylindrical roller body has a first end and a second end that are axially opposite each other, and an outer peripheral surface connecting the first end and the second end. The first end and the second end are respectively provided with a rotating shaft structure for forming a rotatable connection with the handle of the water light instrument. Multiple transverse grooves are arranged circumferentially on the outer peripheral surface. The bottom of the transverse groove is provided with a mounting surface. The radius of curvature of the mounting surface is smaller than the radius of curvature of the outer peripheral surface. Multiple microchips, each of the microchips including a planar substrate and an array of microneedles formed on the surface of the planar substrate; the planar substrate is attached and fixed to the mounting surface, and the multiple microchips are respectively embedded and fixed in the multiple transverse slots.

[0006] In one embodiment, the roller body further includes a plurality of mounting seats, and a plurality of transverse grooves are respectively formed on the outer side of the plurality of mounting seats, and the microchip is fixed to the mounting seat; a plurality of assembly grooves are arranged at intervals along the circumferential direction on the outer peripheral surface of the roller body, and the plurality of mounting seats are respectively embedded and fixed in the plurality of assembly grooves.

[0007] In one embodiment, each of the mounting slots extends at least to one end edge of the roller body to form a lateral opening at the edge of the roller body, and the mounting base is slidable into the mounting slot through the lateral opening of the mounting slot to slidably mount the microchip onto the roller body.

[0008] In one embodiment, each of the mounting slots extends to the first end edge and the second end edge respectively to form lateral openings on both sides, so that the mounting base can slide into the mounting slot from either of the lateral openings at both ends of the mounting slot to slide the microchip onto the roller body.

[0009] In one embodiment, along the depth direction of the mounting groove, the width of the mounting groove on its longitudinal opening side is smaller than the width of the mounting groove on the side away from its longitudinal opening, forming a groove structure that is narrower at the top and wider at the bottom; the side wall of the mounting base slides in contact with the inner wall of the groove structure.

[0010] In one embodiment, the two inner wall surfaces opposite each other of the transverse groove are connected to the bottom wall of the transverse groove at an acute angle, forming a dovetail groove that is narrower at the top and wider at the bottom; the opposite side walls of the mounting base are inclined surfaces in the thickness direction to form a pair of dovetail blocks, and the dovetail blocks slide in conjunction with the dovetail groove.

[0011] In one embodiment, each of the transverse grooves extends at least to one end edge of the roller body to form a transverse opening at the edge of the roller body, and the microchip can slide into the transverse groove through the transverse opening to be slidably mounted on the roller body.

[0012] In one embodiment, the microneedle roller further includes an end cap that axially covers the transverse opening and is detachably connected to the roller body.

[0013] In one embodiment, at the junction of the end cap and the roller body, one of them is provided with a boss and the other with a groove, and the boss is aligned and engaged with the groove along the axial direction of the roller body. One of the outer sidewall of the boss and the inner sidewall of the groove is provided with a guide block, and the other is provided with a guide groove. At least one of the guide block and the guide groove extends along the axial direction of the roller body to the edge of the corresponding wall surface, and the guide block and the guide groove are axially slidably engaged. Second aspect This invention provides a water-light infusion device, comprising: A grip handle, one end of which has a mounting slot; and As described in any of the preceding embodiments, the microneedle roller body is rotatably connected to the grip handle via the pivot structures at both ends. The microneedle roller rotates relative to the grip handle within the mounting groove about the axis of the roller body. A portion of the microneedle roller structure extends out of the mounting groove from the grip handle.

[0014] As can be seen from the above technical solutions, the microneedle roller and water-light infusion device provided in the embodiments of the present invention have at least the following advantages and positive effects: The microneedle roller of the present invention achieves the following breakthrough benefits by creatively setting multiple circumferentially spaced transverse grooves on the side circumferential surface of the roller body and "modularizing" the microchip, that is, including multiple independent microchip units, and then embedding and fixing these microchip units in the transverse grooves: 1. Significantly improves assembly efficiency and automation, abandoning the inefficient assembly mode of "inserting pins one by one" in traditional micro-needle rollers, and transforming it into "assembly module by module". Among them, microchips can be prefabricated on a large scale and with high precision on a plane using mature semiconductor technology. Then, the shaped microchips can be quickly embedded into the horizontal slots. The process is simple and can be easily automated into a production line, improving assembly efficiency by several times or even tens of times.

[0015] 2. Significantly improves product yield and consistency. The microneedle array is mass-produced on a planar substrate, resulting in a much higher yield and consistency in parameters such as tip height, shape, and density compared to the process of inserting microneedles one by one onto the curved surface of the roller body. The assembly method, where the substrate is embedded in the transverse groove, simplifies alignment and ensures secure fixation, avoiding problems such as misalignment or detachment of individual microneedles. This fundamentally guarantees that every microneedle, every microneedle roller, and even the entire batch of products possesses a high degree of uniformity and stable high quality.

[0016] 3. Overcoming the challenge of fitting the curved surfaces of the substrate and roller body in microchips, the concept of using multiple small-area planar substrates to "fit" the overall curved surface of the roller body was realized by "discretizing" the outer peripheral surface of the roller body into horizontal grooves on a flattened bottom surface (i.e., a mounting surface with a smaller radius of curvature than the outer peripheral surface). This not only avoids the risks of breakage and poor adhesion caused by forcibly bending large planar substrates, but also achieves a perfect combination of planar microfabrication technology and three-dimensional microneedle roller applications. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a water-light infusion device according to an embodiment of the present invention; Figure 2 for Figure 1 The diagram shows the assembly of the water-light infusion device; Figure 3 for Figure 2 The diagram shows the longitudinal assembly of the microneedle rollers in the water-light infusion device. Figure 4 for Figure 2 The diagram shows the lateral sliding assembly of the microneedle rollers in the water-light infusion device. Figure 5 for Figure 2 The diagram shows the assembly of the end cap of the microneedle roller in the water-light infusion device. Figure 6 for Figure 5 A partially enlarged view of point A in the assembly drawing shown (the horizontal groove is a dovetail groove); Figure 7 This is a simplified structural diagram of a horizontal groove that serves as a guide rail groove.

[0019] The annotations in the attached figures are explained as follows: 1. Aqua-light infusion device; 10. Handle; 11. Mounting slot; 20. Microneedle roller; 30. Cap; 100. Roller body; 110. First end; 120. Second end; 130. Outer circumferential surface; 140. Rotating shaft structure; 150. Horizontal groove; 151. Mounting surface; 160. Mounting base; 161. Dovetail block; 170. Assembly groove; 171. Lateral opening; 172. Longitudinal opening; 173. Dovetail groove; 174. Guide rail groove; 180. Groove; 181. Guide block; 200. Microchip; 210. Planar substrate; 220. Microneedle array; 300, end cap; 310, boss; 311, guide groove. Detailed Implementation

[0020] Typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various variations in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations herein are for illustrative purposes only and not intended to limit the present invention.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "setup," and "connection" 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 application based on the specific circumstances.

[0023] Reference Figure 1 and Figure 2 This invention provides a hyaluronic acid infusion device 1 using microneedling technology for skincare and beauty treatments. It includes a handle 10, a microneedle roller 20, and a cap 30. The handle 10 serves as the main housing of the device, and its ergonomic design facilitates single-handed gripping and application of force (the shape is not limited). One end of the handle 10 has a mounting groove 11. The microneedle roller 20 is rotatably connected to the mounting groove 11 of the handle 10. The cap 30 is detachably connected to the handle 10. When the device is stored or not in operation, the cap 30 covers the opening of the mounting groove 11 and protects the microneedle roller 20 from accidental contact and dust. In other embodiments of this invention, the cap 30 may not be necessary. It should be noted that in other embodiments, the microneedle roller can also be installed at the mouth of an external liquid storage bottle, dispensing liquid while rolling, allowing the user to hold the external liquid storage container.

[0024] Specifically, such as Figure 3As shown, the microneedle roller 20 includes a cylindrical roller body 100 and multiple microchips 200. The roller body 100 has a first end 110 and a second end 120 axially opposite each other, and an outer peripheral surface 130 connecting the two ends. The first end 110 and the second end 120 are respectively provided with a rotating shaft structure 140 for rotatably connecting with the handle of the hydro-light instrument. Multiple transverse grooves 150 are arranged circumferentially on the outer peripheral surface 130. The bottom of the transverse grooves 150 is provided with a mounting surface 151, and the radius of curvature of the mounting surface 151 is smaller than the radius of curvature of the outer peripheral surface 130 (flattening). The number of microchips 200 is the same as the number of transverse grooves 150 and corresponds one-to-one, that is, multiple microchips 200 are respectively embedded and fixed in multiple transverse grooves 150. Each microchip 200 includes a planar substrate 210 and a microneedle array 220 formed on the surface of the planar substrate 210. The planar substrate 210 is attached and fixed to the mounting surface 151. It is worth noting that "formed on" here is generally understood to mean that the microneedle array 220 is directly grown or processed on the planar substrate 210 material through processes such as deposition etching and photolithography to prepare the microchip 200. The planar substrate 210 is generally made of semiconductor silicon substrate, which is fragile and cannot be bent or made into a curved shape. Therefore, the microchip 200 needs to be attached to a planar or near-planar mounting surface 151 to ensure its safety and stability. The mounting surface 151 of the present invention is preferably designed as a planar surface. It should be further noted that the shape and thickness of the planar substrate 210 are not limited here, and the size of the needles in the microneedle array 220 is not limited. They can be nano-microneedles, millimeter-sized microneedles, micrometer-sized microneedles, etc. The present invention preferably uses nano-microneedles (nano-microchips).

[0025] Combined with Figure 2 The roller body 100 is rotatably connected to the mounting groove 11 via the rotating shaft structure 140 at both ends. The rotating shaft structure 140 can be designed as a shaft pin or a shaft groove. The rotation center line of the rotating shaft structure 140 coincides with the axis of the roller body 100. The microneedle roller 20 rotates around the axis of the roller body 100 in the mounting groove 11 of the grip handle 10. Part of the structure of the microneedle roller 20 extends out of the mounting groove 11 and the grip handle 10, so that the microchip 200 is exposed to provide piercing function.

[0026] In a preferred embodiment of the present invention, reference is made to... Figure 3The roller body 100 also includes multiple mounting seats 160. The number of mounting seats 160, transverse grooves 150, and microchips 200 are the same and correspond one-to-one. The multiple transverse grooves 150 are formed on the outer side of the multiple mounting seats 160. The planar substrate 210 is attached to the mounting surface 151 of the transverse groove 150, and the multiple microchips 200 are fixed on the mounting seats 160 respectively. In addition, the outer peripheral surface 130 of the roller body 100 has multiple assembly slots 170 arranged circumferentially at intervals. The number of assembly slots 170 is the same as the number of mounting seats 160 and corresponds one-to-one. The multiple mounting seats 160 are respectively embedded and fixed in the multiple assembly slots 170. Understandably, during the process of mounting the microchip 200 onto the roller body 100, the user can first attach the microchip 200 (mounting surface 151) to the transverse groove 150 of the mounting base 160 to obtain a microneedle unit, and then fix the microneedle unit in the mounting groove 170 by longitudinal engagement (depth direction of the mounting groove 170) or transverse sliding assembly; or, the user can first fix the mounting base 160 in the mounting groove 170 by longitudinal engagement or transverse sliding assembly, then raise the height of the mounting surface 151 in the transverse groove 150, and then attach and fix the microchip 200 in the transverse groove 150 of the mounting base 160, so as to install multiple microchips 200 circumferentially spaced on the outer peripheral surface 130 of the roller body 100. The mounting base 160 here provides an independent standard mounting carrier for a microchip 200. Fixing the mounting base 160 within the assembly slot 170 allows users to more accurately and stably mount the microchip 200 onto the outer peripheral surface 130 of the roller body 100. Alternatively, in other embodiments, the planar substrate 210 of the microchip 200 can be directly bonded to the bottom wall of the transverse groove 150 without the mounting base 160. In this case, the radius of curvature of at least a portion of the bottom wall of the transverse groove 150 is smaller than the radius of curvature of the outer peripheral surface 130, forming the aforementioned mounting surface 151. When the mounting surface 151 is preferably designed as a plane, it fits tightly against the planar substrate 210.

[0027] In a preferred embodiment of the present invention, in conjunction with reference to... Figure 4 and Figure 5Each mounting slot 170 extends at least to one end edge of the roller body 100 to form a transverse opening 171 at the edge of the roller body 100. The mounting base 160 can slide into the mounting slot 170 through the transverse opening 171 to slide the microchip 200 onto the outer peripheral surface 130 of the roller body 100. More preferably, both ends of each mounting slot 170 extend to the two end edges of the roller body 100 to form two transverse openings 171, so that the mounting base 160 can slide into the mounting slot 170 through either transverse opening 171 at both ends to slide the microchip 200 onto the outer peripheral surface 130 of the roller body 100, thereby achieving dual-sided sliding assembly of the microchip 200 on the roller body 100. It should be noted that in other embodiments, the transverse slot 150 does not need to be provided with a transverse opening 171, and the microchip 200 can also be loaded into the transverse slot 150 through the longitudinal opening 172.

[0028] In a preferred embodiment, the microchip 200 is detachably mounted in the mounting slot 170 to facilitate the replacement of the microchip 200 in a certain mounting slot 170 by the user.

[0029] In a preferred embodiment of the present invention, in order to prevent the microchip 200 from sliding laterally out of the assembly slot 170, in conjunction with reference to the reference... Figure 3 and 4 The microneedle roller 20 also includes an end cap 300, which axially covers the lateral opening 171 of the mounting groove 170 and is detachably connected to the roller body 100. The user first slides the microchip 200 onto the outer peripheral surface 130 of the roller body 100 via the mounting base 160, and then connects the end cap 300 to the roller body 100 to prevent the mounting base 160 from laterally disengaging from the mounting groove 170, thereby preventing the microchip 200 from laterally disengaging from the roller body 100. Figure 4 The illustration shows that when the mounting groove 170 has a single-sided opening and the transverse opening 171 is located at one end (first end 110 or second end 120) of the roller body 100, the number of end caps 300 is one and detachably connected to the first end 110 or the second end 120 of the roller body 100. In other embodiments, the transverse groove 150 may also have a double-sided opening, and the number of end caps 300 is two, respectively detachably connected to the first end 110 and the second end 120. It is worth noting that the end cap 300 is only one implementation structure for sliding anti-detachment. In other embodiments, the end cap 300 is not required, and anti-detachment can also be achieved through interference sliding assembly. The end cap 300 here is generally designed as a disc or ring, which can simultaneously cover the transverse openings 171 of multiple mounting grooves 170 that circumferentially cover the end of the roller body 100.

[0030] Reference Figure 5 and Figure 6In an optional embodiment, at the junction of the end cap 300 and the roller body 100, one end is provided with a boss 310 and the other with a groove 180. The boss 310 is aligned and engaged with the groove 180 along the axial direction of the roller body 100, thereby enabling the end cap 300 to be detachably connected to one end of the roller body 100. Further, one of the outer sidewall of the boss 310 and the inner sidewall of the groove 180 is provided with a guide block 181 and the other with a guide groove 311. At least one of the guide block 181 and the guide groove 311 extends along the axial direction of the roller body 100 to the edge of the corresponding wall surface, and the guide block 181 and the guide groove 311 are axially slidingly engaged. Figure 5 The illustration shows that the end of the roller body 100 has a groove 180, and a guide block 181 is provided inside the groove 180; the end cap 300 has a boss 310, and the outer side wall of the boss 310 has a guide groove 311, which extends to the edge of the outer side wall of the boss 310. It should be noted that the guide block 181 and the guide groove 311 serve as a foolproof structure. Their sliding engagement is used to position and guide the boss 310 to move stably axially until it engages within the groove 180. The engagement of the guide block 181 within the guide groove 311 also allows for circumferential positioning of the end cap 300 and the roller body 100, enhancing the connection stability between the end cap 300 and the roller body 100. In other embodiments, the end cap 300 and the roller body 100 can also be detachably connected through structures such as magnetic attraction, adhesion, or snap-fit.

[0031] In a preferred embodiment of the present invention, in order to prevent the mounting base 160 from longitudinally disengaging from the assembly slot 170, reference is made to... Figure 6 Along the depth direction of the assembly groove 170, the width of the assembly groove 170 on the side with its longitudinal opening 172 is smaller than the width of the assembly groove 170 on the side away from its longitudinal opening 172, forming a groove structure that is narrower at the top and wider at the bottom. The side wall of the mounting base 160 slides in contact with the inner wall of the groove structure, and the mounting base 160 is designed with a shape that is narrower at the top and wider at the bottom along its thickness direction. The design of being narrower at the top and wider at the bottom can prevent the mounting base 160 from longitudinally detaching from the assembly groove 170, thereby providing a longitudinal anti-detachment function for the microchip 200. In other embodiments, the mounting base 160 can also achieve longitudinal anti-detachment through interference sliding assembly. Preferably, Figure 6 As illustrated, the two opposing inner wall surfaces of the assembly groove 170 are both connected to the bottom wall of the assembly groove 170 at an acute angle, forming a dovetail groove 173 that is narrower at the top and wider at the bottom (the dovetail groove 173 is also a type of slide groove structure); the opposite side walls of the mounting base 160 are inclined surfaces in the thickness direction to form a pair of dovetail blocks 161, which slide in conjunction with the dovetail groove 173. In other embodiments, the side wall surface of the mounting base 160 and the inner wall surface of the slide groove structure (horizontal groove 150) can be processed into mutually fitting curved surfaces or guide rail surfaces, or other structures that are narrower at the top and wider at the bottom, to achieve longitudinal anti-detachment of the mounting base 160. Figure 7The diagram illustrates that the horizontal groove 150 can also be designed as a guide rail groove 174 that is narrow at the top and wide at the bottom, with the side wall of the mounting base 160 slidingly engaging with the inner side wall of the guide rail groove 174.

[0032] It should be noted that in another embodiment (not shown in the figure), when a separate mounting base 160 is not required, for example, when the mounting base 160 and the roller body 100 are integrally molded, the mounting groove 170 provided on the roller body 100 can also be understood as the transverse groove 150 on the roller body 100. Each transverse groove 150 extends at least to one end edge of the roller body 100 to form a corresponding transverse opening 171 at the edge of the roller body 100. The microchip 200 (planar substrate 210) can slide into the transverse groove 150 through the transverse opening 171 to be slidably mounted on the roller body 100. In this embodiment, the sliding assembly details between the planar substrate 210 and the transverse groove 150 are similar to the sliding assembly details between the mounting base 160 and the mounting groove 170. The end cap 300 prevents the microchip 200 from detaching laterally from the roller body 100. The transverse groove 150 can be designed to be narrower at the top and wider at the bottom to prevent the microchip 200 from detaching longitudinally from the roller body 100. Preferably, in one embodiment, reference Figure 5 The upper surface of the mounting base 160 connects with the outer peripheral surface 130 of the roller body 100. The radius of curvature of the upper surface of the mounting base 160 is compatible with (the same as) the radius of curvature of the outer peripheral surface 130 of the roller body 100, allowing the two curved surfaces to connect smoothly. This structure ensures the curvature consistency of the entire outer peripheral surface 130 of the roller body 100, which can improve the smoothness and comfort of contact with the skin during the rolling of the microneedle roller 20. It not only allows the microchip 200 to fit evenly and stably against the skin surface, but also improves the smoothness of the rolling of the microneedle roller 20, thus enhancing the overall user experience.

[0033] In a preferred embodiment of the present invention, reference continues to... Figure 5 The top of the microneedle array 220 is lower than or flush with the outer peripheral surface 130 of the roller body 100, further ensuring the smooth rolling of the microneedle roller 20 and preventing excessive force from puncturing or scratching the skin. Of course, in other embodiments, the top of the microneedle array 220 may also be designed to protrude from the outer peripheral surface 130 of the roller body 100. This application does not limit the height of the top of the microneedle array 220 relative to the outer peripheral surface 130 of the roller body 100.

[0034] The microneedle roller 20 of the present invention creatively provides a plurality of circumferentially spaced transverse grooves 150 on the outer peripheral surface 130 of the roller body 100, and "modularizes" the microchip 200, that is, includes a plurality of independent microchip 200 units, and then embeds and fixes these microchip 200 units in the transverse grooves 150, thereby achieving the following breakthrough beneficial effects: 1. Significantly improves assembly efficiency and automation, abandoning the inefficient "pin insertion one by one" assembly mode of traditional micro-needle rollers 20, and transforming it into "module by module" assembly. Among them, microchips can be prefabricated on a large scale and with high precision on a plane using mature semiconductor technology. Then, the shaped microchips can be quickly embedded into the horizontal slots 150. The process is simple and can be easily automated into a production line, improving assembly efficiency by several times or even tens of times.

[0035] 2. Significantly improves product yield and consistency. The microneedle array 220 is mass-produced on the planar substrate 210, and the consistency and yield of parameters such as tip height, shape, and density are far superior to the process of inserting microneedles one by one on the curved surface of the roller body 100. The assembly method of embedding the planar substrate 210 into the transverse groove 150 is simple to align and firmly fixed, avoiding problems such as the skewness and detachment of individual microneedles. This fundamentally ensures that each microneedle, each microneedle roller 20, and even the entire batch of products have a high degree of uniformity and stable high quality.

[0036] 3. Overcoming the challenge of fitting the curved surface of the planar substrate 210 and the roller body 100 in the microchip, the concept of using multiple small-area planar substrates 210 to "fit" the overall curved surface of the roller body 100 was realized by "discretizing" the outer peripheral surface 130 of the roller body 100 into a horizontal groove 150 of a flattened bottom surface (i.e., a mounting surface 151 with a smaller radius of curvature than the outer peripheral surface 130). This not only avoids the risks of breakage and poor adhesion caused by forcibly bending a large planar substrate 210, but also perfectly combines the application of planar microchips obtained by microfabrication technology with the three-dimensional microneedle roller 20.

[0037] Although the invention has been described with reference to several typical embodiments, it should be understood that the terminology used is illustrative and exemplary, and not restrictive. Since the invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A microneedle roller, characterized in that, include: The cylindrical roller body has a first end and a second end that are axially opposite each other, and an outer peripheral surface connecting the first end and the second end. The first end and the second end are respectively provided with a rotating shaft structure for forming a rotatable connection with the handle of the water light instrument. Multiple transverse grooves are arranged circumferentially on the outer peripheral surface. The bottom of the transverse groove is provided with a mounting surface. The radius of curvature of the mounting surface is smaller than the radius of curvature of the outer peripheral surface. Multiple microchips, each of the microchips including a planar substrate and an array of microneedles formed on the surface of the planar substrate; the planar substrate is attached and fixed to the mounting surface, such that the multiple microchips are respectively fixed in the multiple transverse slots.

2. The microneedle roller according to claim 1, characterized in that, The roller body also includes multiple mounting seats, and multiple transverse grooves are formed on the outer side of the multiple mounting seats respectively. The microchip is fixed to the mounting seat. Multiple assembly slots are arranged circumferentially on the outer peripheral surface of the roller body, and the multiple mounting seats are respectively embedded and fixed in the multiple assembly slots.

3. The microneedle roller according to claim 2, characterized in that, Each of the mounting slots extends at least to one end edge of the roller body to form a lateral opening at the edge of the roller body, and the mounting base is slidable into the mounting slot through the lateral opening of the mounting slot to slidably mount the microchip onto the roller body.

4. The microneedle roller according to claim 3, characterized in that, Each of the assembly slots extends to the first end edge and the second end edge respectively to form lateral openings on both sides, so that the mounting base can slide into the assembly slot from either of the lateral openings at both ends of the assembly slot to slide the microchip onto the roller body.

5. The microneedle roller according to claim 3, characterized in that, Along the depth direction of the assembly groove, the width of the assembly groove on its longitudinal opening side is smaller than the width of the assembly groove on the side away from its longitudinal opening, forming a sliding groove structure that is narrower at the top and wider at the bottom; the side wall of the mounting base slides in contact with the inner wall of the sliding groove structure.

6. The microneedle roller according to claim 5, characterized in that, The two inner wall surfaces opposite each other of the assembly groove are connected to the bottom wall of the assembly groove at an acute angle, forming a dovetail groove that is narrower at the top and wider at the bottom; the opposite side walls of the mounting base are inclined surfaces in the thickness direction to form a pair of dovetail blocks, and the dovetail blocks slide in conjunction with the dovetail groove.

7. The microneedle roller according to claim 1, characterized in that, Each of the transverse grooves extends at least to one end edge of the roller body to form a transverse opening at the edge of the roller body, and the microchip can slide into the transverse groove through the transverse opening to be slidably mounted on the roller body.

8. The microneedle roller according to any one of claims 3 to 7, characterized in that, The microneedle roller also includes an end cap, which axially covers the transverse opening and is detachably connected to the roller body.

9. The microneedle roller according to claim 8, characterized in that, At the junction of the end cap and the roller body, one of them is provided with a boss and the other with a groove. The boss is aligned and engaged with the groove along the axial direction of the roller body. One of the outer sidewall of the boss and the inner sidewall of the groove is provided with a guide block, and the other is provided with a guide groove. At least one of the guide block and the guide groove extends along the axial direction of the roller body to the edge of the corresponding wall surface, and the guide block and the guide groove slide in axial direction.

10. A water-light infusion device, characterized in that, include: The handle has a mounting slot at one end; and The microneedle roller as described in any one of claims 1-9, wherein the roller body is rotatably connected to the grip handle via the pivot structure at both ends, the microneedle roller rotates relative to the grip handle in the mounting groove about the axis of the roller body, and the outer peripheral surface of the roller body extends out of the mounting groove from the grip handle.

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