KR20210010595A - Manufacturing method of micro-structure for delivery of bioactive materials to skin - Google Patents

Abstract

The present invention relates to a microneedle device and a method for fabricating the same and, more specifically, to a non-patch type microneedle, of which a supporting part (supporting body) may be removed after invading the microneedle into the skin, unlike a conventional patch type microneedle, and to a method for fabricating the same with high productivity.

Description

Manufacturing method of micro-structure for delivery of bioactive materials to skin

The present invention manufactures a new type of non-patch type micro-structure in which not only a patch-type micro-needle, which is adhered to the existing skin, but also a support body is separated and only the micro-needle is implanted into the skin, by a continuous/discontinuous method. It's about how.

One of the most active research studies in the field of functional cosmetics and pharmaceuticals is a drug delivery method through the skin. In the method of transdermal drug delivery, only drugs with a molecular weight of 500 Da or less are possible, and there is a limit in drug delivery and controlled release by the stratum corneum, and there is a difficulty in continuously delivering drugs into the body. Therefore, there is a need for a system that is easy to use and can minimize side effects of drugs. The microneedle basically passes the stratum corneum, which forms the outermost layer of the skin, and delivers the drug to the blood vessels below the skin layer.

The representative dissolving micro-needle method of microneedles manufactures microneedles by fusing a water-soluble or biodegradable material that can be dissolved in the skin with a drug, and the drug is delivered as the water-soluble or biodegradable material is dissolved in the skin. This is how it becomes.

Conventional microneedles are manufactured by supplying biodegradable polymer powder to a microneedle mold, then filling the mold by applying centrifugal force or vacuum pressure, and heating or cooling the mold, or by spotting a viscous substance and then other. There is a method of contacting a substrate, stretching it, drying it, and solidifying it.

However, the conventional method is not suitable for mass production because the process is complicated and continuous production is difficult, and there is a disadvantage that the amount of drugs contained in the microneedle cannot be precisely controlled.

Japanese Patent Publication No. 2007-535343 (published on 2007.12.06) Japanese Patent Publication No. 2011-012050 (Publication date 2011.01.20)

The present invention is an invention of a method for manufacturing a microneedle that compensates for the existing shortcomings, and a microstructure, preferably a patch-type or non-patch-type microneedle, which improves the inconvenience of quantitative drug injection and use through a simplified continuous/discontinuous process. It is intended to provide a method that can be manufactured.

The method of manufacturing a microstructure for skin delivery of a physiologically active substance according to the present invention for solving the above problem is a method of manufacturing a microstructure in which a plurality of microneedles are formed, and a monolayer film by casting a biodegradable solution containing a physiologically active substance and then solidifying it. Forming or casting a biodegradable solution containing a physiologically active material on the upper portion of the support and solidification to form a first step of a multi-pack film formed with the support and the drug portion; A second step of forming a microstructure on the film by applying pressure to the single layer film or the multilayer film with a plate-shaped mold or a roller-shaped mold in which an intaglio microneedle structure is formed; And a third step of separating the microstructure from the mold.

In a preferred embodiment of the present invention, the microstructure may have a support and a drug, and the microstructure may be integrated with a support and a drug (patch type), or may be separated from the drug and support (non-patch).

As a preferred embodiment of the present invention, when the microstructure is integrated with the support part and the drug part, the biodegradable solution of step 1 contains solid content and water in a weight ratio of 1: 0.25 to 20, and the solid content is sugar 5 to 40 It may contain a biodegradable polymer in weight %, 10 to 35 weight% of plasticizer, and the balance.

As a preferred embodiment of the present invention, when the microstructure is separated from the support part and the drug part, the biodegradable solution of step 1 contains solid content and water in a weight ratio of 1: 0.25 to 20, and the solid content is 5 to 40 weight of sugar. %, 10 to 35% by weight of a plasticizer, and a residual amount of a biodegradable polymer.

As a preferred embodiment of the present invention, when the microstructure is integrated with the support part and the drug part and/or the support part and the drug part are separated, the biodegradable solution further contains a physiologically active substance, and the physiologically active substance is Based on 100 parts by weight of the saccharide of the solid content, it may be included in an amount of 10 to 3,000 parts by weight.

As a preferred embodiment of the present invention, when the microstructure is separated from the support part and the drug part, the support part of the multilayer film contains solid content and water in a weight ratio of 1: 0.25 to 20, and the solid content of the support part is 30 to 70 weight of sugar. %, plasticizer 3 to 20% by weight, and the remaining amount of the biodegradable polymer can be prepared by using a fast dissolving solution containing.

In a preferred embodiment of the present invention, the biodegradable polymer used for preparing the biodegradable solution and/or fast-dissolving solution may include a low molecular weight polymer and a high molecular weight polymer.

As a preferred embodiment of the present invention, the film having a single layer structure of the first step may have a thickness of 15 to 300 μm.

As a preferred embodiment of the present invention, the thickness of the support portion of the multilayer film in the first step may be 5 to 100 μm and the thickness of the drug portion may be 15 to 300 μm.

As a preferred embodiment of the present invention, when molding with a plate-shaped mold in the second step, the plate-shaped mold may have a temperature of 30 to 120°C, and may be formed by applying a pressure of 75 to 120 kgf/cm ² .

As a preferred embodiment of the present invention, when molding with a roller-type mold in the second step, the roller-type mold may have a temperature of 65 to 105°C and a rotational speed of the roller-type mold of 2 to 10 rpm.

As a preferred embodiment of the present invention, the central axis of each of the plurality of microneedles of the manufactured microstructure may be formed to have a separation distance of 100 ~ 700㎛ from the central axis of the nearest neighboring microneedles.

As a preferred embodiment of the present invention, the microneedles may have a height of 50 to 1,000 μm.

As a preferred embodiment of the present invention, the microneedles may be conical, urn-shaped, or a conical polyhedron having a bottom surface of a polygonal structure composed of three or more sides.

As a preferred embodiment of the present invention, the first step is to prepare a support layer by applying a fast dissolving solution on top of the substrate and then solidifying it, and then preparing a biodegradable solution containing a physiologically active material on the fast dissolving support layer. After casting, it can be solidified to produce a film in which a drug layer is formed. However, it is not limited thereto.

As a preferred embodiment of the present invention, the fast-dissolving solution may contain a biodegradable polymer, a sugar, a plasticizer, and water.

As a preferred embodiment of the present invention, the biodegradable solution may contain a biodegradable polymer, a sugar, a plasticizer, a physiologically active substance, and water.

In a preferred embodiment of the present invention, the drug layer is completely inserted into the needle groove by pressure, and the fast dissolving support layer may be partially or completely inserted or not inserted.

As a preferred embodiment of the present invention, the third step may apply pressure in various ways. Typically, it may be a method of raising a plate-shaped mold and pressing it from above. More preferably, it may be a method in which pressure is applied while passing through the roller using a roller-shaped mold. However, it is not limited thereto.

As a preferred embodiment of the present invention, the microneedle groove of the mold for forming the microneedle is most preferably 50㎛ ~ 1,000㎛, but is not limited thereto.

As a preferred embodiment of the present invention, the third step includes a process of applying pressure for several seconds to several minutes at a pressure of 70 kgf/cm ² to 130 kgf/cm ² . At this time, the mold may have a temperature between 30°C and 120°C to smoothly form the film.

In addition, the present invention is to provide a manufacturing method for mass production continuously / discontinuously with a simplified process using pressure.

The microneedle manufacturing method as a microstructure of the present invention can simplify the process by manufacturing the microneedles using pressure, and also has the effect of being able to mass-produce by continuously manufacturing through a roller-shaped mold.

1A and 1B are schematic cross-sectional views showing an example of the microneedles 100 and 200 manufactured in the present invention.
2 is a schematic diagram showing a process in which the microneedles of the present invention invade the skin.
3 is a schematic diagram showing a process of forming the microneedle of the present invention into a plate-shaped mold.
4 is a schematic diagram showing a process of forming the microneedle of the present invention into a roller-type mold.
5 is a schematic diagram showing the shape of a microneedle manufactured by molding into a plate-shaped or roller-shaped mold.
6 is a photomicrograph of a patch-type microneedle prepared in Example 1-1.
7 is a photograph of the microstructures prepared in Examples 1-3 and 1-4.
8 is a photograph of the microstructure prepared in Example 2-3.
9 is a photograph of a microstructure prepared in Example 3-1 and Example 3-3.

Hereinafter, the present invention will be described in detail.

1A and 1B are schematic cross-sectional views showing an example of the microneedles 100 and 200 manufactured in the present invention. As shown, it includes a support portion 10 and a drug portion 20. Further, the support portion has a protrusion 5, and the drug portion may be formed (or stacked) on the protrusion 5 of the support portion 10.

The microstructure of the present invention is a minimally invasive system, which is a technology that releases bioactive substances such as drugs by inserting a micro-sized biodegradable needle into the skin. It has the advantage of being able to release drugs in a sustained-release form using biodegradable polymers while delivering biomedicines such as insulin and vaccines, which were difficult to obtain, into the body through the skin to show the same effect as injections.

For example, in the case of the GLP-1 agonist (Receptor Agonist) Exenatide, a diabetes treatment peptide, subcutaneous in the abdomen, thigh, or arm twice a day for patients who are not adequately treated with conventional diabetes medications. It is injected via injection. However, patients feel uncomfortable due to the fact that drug injection through subcutaneous injection must be performed several times, and there are cases where effective drug use is not achieved. However, the microstructure of the non-patch type microneedle device type of the present invention can supply enough drugs in a desired amount without loss while minimizing the patient's dosage convenience, pain, and rejection, and by adjusting the administration depth of the drug, a quantitative drug can be administered. It can be administered and the release rate of the drug can be properly controlled.

When the microneedle of the present invention is of a non-patch type, the support part and the drug part may be made of different materials as shown in FIG. 1A, and in the case of the patch type, they may be made of the same material as shown in FIG. 1B. In the case of FIG. 1B, a bioactive material 25 may be included in the support.

As shown in the schematic diagram in Fig. 2, the non-patch type microneedle 100 is attached to the skin in the direction of the drug part 20, and then the support part 20 of the microneedles is removed from the skin to invade the microneedles (transplantation) I can make it. That is, after the drug part is implanted into the skin, the support part and the drug part are separated, and the drug part is dissolved in the human body to deliver the drug component.

The conventional method of manufacturing microneedles is complicated in the process and cannot be produced continuously, and thus it is difficult to mass-produce, and thus a simple and continuous method of mass production is required.

The microneedle, which is a microstructure for skin delivery of a physiologically active substance of the present invention, is a microstructure in which a plurality of microneedles are formed, and can be manufactured through the following method.

Casting the biodegradable solution and solidifying to form a single-layer film, or casting the biodegradable solution on the upper portion of the support and solidifying to form a multi-pack film formed with a support and a drug unit; A second step of forming a microstructure on the film by applying pressure to the single layer film or the multilayer film with a plate mold or a roller mold; And a third step of separating the microstructure from the mold.

The single-layer film and/or multi-layer film of the first step can be used to manufacture a patch-type or non-patch-type microneedle, preferably a single-layer film is suitable for manufacturing a patch-type microneedle, and a multilayer film is suitable for manufacturing a non-patch-type microneedle. can do.

When the microstructure to be manufactured is a patch-type microneedle having a structure in which a support part and a drug part are integrated, it is advantageous in terms of manufacturing to use the monolayer film in step 1, and the monolayer film may consist only of a biodegradable solution.

And, when the microstructure to be manufactured is a non-patch type microneedle having a structure in which the support part and the drug part are separated, it is advantageous in terms of manufacturing to use the multilayer film in step 1, and the support part of the multilayer film contains a bioactive material. It is not recommended to include a physiologically active substance only in the drug part.

Physical properties of the single-layer film or multi-layer film may vary depending on the thickness and moisture content of the film. If the thickness of the film is too thin, it may not be possible to completely fill the grooves of the mold during the second stage of molding, and if it is too thick, the drying time of the film may be lengthened and a uniform film may not be formed. In addition, the moisture content in the film can be controlled through drying conditions. If the moisture content is too low, the film may increase in strength and molding may not be possible. If it is too high, the film will become too soft and stick to the mold or the needle shape cannot be maintained. I can. It varies depending on the composition and composition of the drug part of the suitable thickness and moisture content of the film, and the moisture content in the drug part of the monolayer film or the multilayer film is 5% to 40% by weight, preferably 10 to 30% by weight, more preferably Preferably, having 12.0 to 26.5% by weight is suitable in terms of moldability.

In addition, the single-layer film of step 1 may have a thickness of 15 to 300 µm, preferably 20 to 250 µm, and more preferably 20 to 200 µm.

In addition, the multilayer film of the first step may be a support part thickness of 5 to 100 µm and a drug part thickness of 15 to 300 µm, preferably a support part thickness of 10 to 90 µm and a drug part thickness of 15 to 250 µm, more preferably a support part thickness It may be 15 to 80 ㎛ and the thickness of the drug part 15 to 200 ㎛.

The biodegradable solution used to form a single-layer film in the first step or to form a drug portion having a multi-layer film configuration contains a solid content and water.

The solid content may include a sugar, a biodegradable polymer and a plasticizer, or the solid content may further include a bioactive material.

Among the constitution of the biodegradable solution, the saccharide serves as a carrier for a physiologically active substance together with a biodegradable polymer, and the saccharide may include polysaccharides or at least one selected from polysaccharides and monosaccharides. At this time, the polysaccharide may be trehalose, turranose, and at least one selected from cellobiose, maltose, sucrose, and lactose, and the monosaccharide is ketotiose, aldotriose, ketotetrose, aldotet. Ros, ketopentose, ribose, arabinose, xylose, deoxysaccharide, psicose, fructose, sorbose, tagatose, altose, glucose, manose, gulose, idos, galactose, At least one selected from talos, fucose, and rhamnose may be used.

In addition, the amount of the saccharide used to prepare the biodegradable solution may include 5 to 40% by weight, preferably 5 to 30% by weight, and more preferably 7.5 to 25% by weight based on the total weight of the solid content. . At this time, if the amount of sugar is less than 5% by weight, there may be a problem that it takes too long for the needle to dissolve after skin erosion (transplantation), and if it exceeds 40% by weight, the film is broken or melted and adhered to the mold during needle molding. There may be.

In the composition of the biodegradable solution, the plasticizer plays a role of controlling the moldability of the film, and a plasticizer of a component harmless to the human body may be used, and specific examples include glycerin, ethylene glycol, propylene glycol, butylene glycol, and dipropylene. One or more selected from polyols such as glycol may be used. In addition, the amount of plasticizer used may include 10 to 35% by weight, preferably 10 to 30% by weight, more preferably 15 to 30% by weight, based on the total weight of the solid content. At this time, if the amount of plasticizer used is less than 10% by weight, the amount of use is too small and the film is too brittle, and the film may be broken by pressure, or it may be too hard to form well, and using more than 35% by weight is excessive use. After molding, there may be a problem in that the shape of the needle is not maintained or sufficient strength is not displayed.

Among the composition of the biodegradable solution, the biodegradable polymer is polyvinylpyrrolidone, polyethylene glycol, polyethylene oxide, PGLA (Lactic-co-Glycolic acid)) resin, PLA (Poly (lactic acid)) resin, PLACL (Poly (lactic acid-co-caprolactone)) resin, PCL (Polycaprolactone) resin, hyaluronic acid, and salts thereof, may contain at least one selected from, and preferably PLA (Poly (lactic acid)) resin, PLACL (Poly (lactic acid-co-caprolactone)) resin, PCL (Polycaprolactone) resin, hyaluronic acid (Hyarulonic acid) and may include one or more selected from salts thereof, preferably polyvinylpyrrolidone, It may contain at least one selected from hyaluronic acid and salts thereof, and more preferably polyvinylpyrrolidone is used. And, as the polyvinylpyrrolidone, a weight average molecular weight of 320,000 to 2,000,000, preferably a weight average molecular weight of 380,000 to 1,600,000, more preferably 1,000,000 to 1,500,000.

In addition, the amount of the biodegradable polymer used to prepare the biodegradable solution may include the remaining amount in addition to sugars, plasticizers and/or bioactive substances in the total weight of the biodegradable solution. At this time, if the amount of the biodegradable polymer is too small, there may be a problem of breaking the skin during erosion (transplantation), and if it is used in an excessive amount, there may be a problem in that needle molding is difficult due to insufficient moldability.

The physiologically active substance used in the preparation of a biodegradable solution may contain a physiologically active substance having a high molecular weight as well as a low molecular weight, preferably a physiologically active substance having a weight average molecular weight of several hundred Da to several million Da, preferably It may contain a physiologically active material having a weight average molecular weight of 100 Da to 3,000,000 Da. The bioactive material is protein; Drug components such as diabetes treatment, insulin, and vaccine; Cosmetic ingredients; And a variety of physiologically active substances. In addition, the amount of the physiologically active substance used can be adjusted according to the amount of drug in the skin, and based on 100 parts by weight of saccharides in the solid composition, 10 to 3,000 parts by weight, preferably 20 to 2,000 parts by weight, more preferably 30 It is recommended to use ~ 1,500 parts by weight.

A biodegradable solution is prepared by dissolving the solid content or solid content and a physiologically active substance in water. The biodegradable solution may contain solids and water in a weight ratio of 1: 0.25 to 20, preferably in a weight ratio of 1: 0.5 to 10, more preferably in a weight ratio of 1: 2 to 6, in which case, If the amount of water used is less than 0.25 weight ratio, the moisture content of the drug portion of the monolayer film or multilayer film prepared using it is too low, so that the viscosity may increase, resulting in poor applicability and moldability.If the water amount exceeds 20 weight ratio, the viscosity is too low. There may be a problem that the coating property is low, or the drying time is too long and productivity is decreased.

When manufacturing a non-patch type microstructure, a multilayer film in which the support part and the drug part are separated is suitable. In this case, the drug part in step 1 may be prepared using a biodegradable solution having the same composition as the biodegradable solution described above.

In addition, the support portion of the multilayer film does not contain a physiologically active substance, and is composed of a composition and composition ratio different from that of the drug portion. In addition, the support part and the drug part of the multilayer film have different melting points, and the support part melts faster at a lower temperature than the drug part.

The support part can be prepared by casting a fast dissolving solution on the upper part of the substrate and then solidifying it, and casting a biodegradable solution on the upper part of the prepared support part and solidifying it to produce a multilayer film having a support part and a drug part can do.

When preparing a multilayer film, the fast-dissolving solution may include a solid component including a sugar, a plasticizer, and a biodegradable polymer; And water; may include.

At this time, the saccharide, which is a solid component of the fast-dissolving solution, may be used the same as the saccharide used in the preparation of the biodegradable solution, or other saccharides may be used, and may include at least one selected from polysaccharides and monosaccharides. At this time, the polysaccharide may be trehalose, turranose, and at least one selected from cellobiose, maltose, sucrose, and lactose, and the monosaccharide is ketotiose, aldotriose, ketotetrose, aldotet. Ros, ketopentose, ribose, arabinose, xylose, deoxysaccharide, psicose, fructose, sorbose, tagatose, altose, glucose, manose, gulose, idos, galactose, At least one selected from talos, fucose, and rhamnose may be used.

In addition, the fast-dissolving film contains a greater amount of saccharides than the biodegradable film to increase the melting point. The amount of the saccharide used to prepare the fast-dissolving solution may include 30 to 70% by weight, preferably 35 to 65% by weight, and more preferably 40 to 60% by weight, based on the total weight of the solid content. At this time, if the amount of sugar is less than 30% by weight, the film does not dissolve quickly, so there may be a problem that the film is not separated after erosion (transplantation) of the needle skin, and if it exceeds 70% by weight, the film on the support part melts or breaks easily during storage. There may be.

In addition, the plasticizer of the fast-dissolving solution used to form the support part of the non-patch type microstructure may be the same or different from the plasticizer used in the preparation of the biodegradable solution of the integrated (or patch-type) microstructure described above. The amount of the plasticizer used may include 3 to 20% by weight, preferably 5 to 20% by weight, and more preferably 7.5 to 15% by weight, based on the total weight of the solid content. At this time, if the amount of plasticizer used is less than 3% by weight, the amount of use is too small, and the support part may be broken during molding, and if it is used in excess of 20% by weight, the film may become too soft to support the needle, making proper insertion difficult. .

The amount of the biodegradable polymer used in preparing the fast-dissolving solution used to form the support part of the non-patch type microstructure may be used in the remaining amount other than sugars and plasticizers in the total weight of the biodegradable solution. At this time, if the amount of the biodegradable polymer is too small, there may be a problem that the film is too brittle and cracks, and if it is used in an excessive amount, the dissolution rate is not fast enough, so there may be a problem that it takes a long time to separate the needle.

Among the composition of the fast-dissolving solution, the biodegradable polymer is polyvinylpyrrolidone, polyethylene glycol, polyethylene oxide, PGLA (Lactic-co-Glycolic acid)) resin, PLA (Poly (lactic acid)) resin, PLACL (Poly (lactic acid-co-caprolactone)) resin, PCL (Polycaprolactone) resin, hyaluronic acid, and salts thereof, may contain at least one selected from, and preferably polyvinylpyrrolidone, hyaluronic acid ( Hyarulonic acid) and one or more selected from salts thereof may be included, and more preferably hyaluronic acid is used. In addition, as the hyaluronic acid, one having a weight average molecular weight of 5,000 to 1,000,000, preferably 6,500 to 300,000 da, and more preferably 7,000 to 120,000 da, is preferably used.

A fast-dissolving solution is prepared by dissolving sugars, biodegradable polymers, and plasticizers in water. At this time, when the microstructure is separated from the support part and the drug part, a fast-dissolving solution is prepared by dissolving sugars, biodegradable polymers, and plasticizers in water. At this time, when the microstructure is separated from the support part and the drug part, the amount of water in the fast-dissolving solution may be used in a weight ratio of 1: 0.25 to 20 based on the total weight of the solid content, and preferably 1: 0.25 to 10 weight ratio. , More preferably, it is recommended to use a weight ratio of 1: 0.5 to 4.5, and at this time, if the amount of water is less than 0.25 weight ratio, the moisture content of the drug portion of the single-layer film or multi-layer film prepared using it is too low, so that the viscosity is increased. , Moldability may be inferior, and when the amount of water used exceeds 20 weight ratio, there may be a problem that the viscosity is too low and the applicability is poor, or the drying time is too long and the productivity is decreased.

In step 1, a single layer or multi-layered film is prepared with a biodegradable solution and/or a fast-dissolving solution having the above composition and composition ratio, and then, in step 2, it is formed into a microstructure.

In the second-stage microstructure molding, as shown in the schematic diagram in Fig. 3, the microneedle structure is manufactured by pressure molding with a plate-shaped mold or in a continuous manner using a roller-shaped mold as shown in the schematic diagram in Fig. The microneedle structure can be continuously manufactured.

The plate-shaped mold and/or the roller-shaped mold may have a plurality of intaglio microneedle grooves having a depth of about 50 to 1,000 μm. In addition, the groove shape of the intaglio may be a conical shape, a jar shape, or a conical polyhedron (eg, a square pyramid) having a bottom surface of a polygonal structure composed of three or more sides.

When molding with a plate-shaped mold in the second step, the plate-shaped mold has a temperature of 30 to 120°C, and pressure of 75 to 120 kgf/cm ² is applied to perform pressure molding, and preferably, the plate-shaped mold has a temperature of 60 to 100°C. And, by applying a pressure of 78 to 115 kgf/cm ² , pressure molding can be performed. At this time, if the pressurization pressure is less than 75 kgf/cm ^2, there may be a problem that the needle constituting the drug unit cannot have a shape that can penetrate the skin, and exceeding the pressure of 120 kgf/cm ² It is uneconomical. In addition, when the temperature of the plate-shaped mold exceeds 120° C., the single-layer film or the multi-layer film rapidly melts, and thus the moldability in the form of a needle may be deteriorated.

In addition, when molding into a roller-type mold in the second step, the roller-type mold may have a temperature of 65 to 105°C and a rotational speed of the roller-type mold of 2 to 8 rpm, preferably 75 to 105°C and a roller-type mold The rotation speed of may be 2.5 ~ 7 rpm. At this time, if the temperature of the roller-type mold is less than 65°C, the tip of the needle shape may not be sharply formed within the rotational speed range, and if the temperature of the roller-type mold exceeds 105°C, the temperature of a single layer film or a multilayer film As a result, the viscosity is too low (becomes soft) and the molded shape is pulled out of the roller-type mold and cooled without maintaining an appropriate needle shape, so that even needles may not be formed. In addition, when the rotational speed of the roller-type mold is less than 2 rpm, compatibility is deteriorated, and when the rotational speed of the roller-type mold exceeds 8 rpm, the film is not completely filled into the groove of the roller-type mold, so that a sharp needle shape may not be formed.

By separating the microstructure of the present invention manufactured in the form of a needle through the second step from a plate-shaped mold or a roller-shaped mold, a microstructure (microneedle) as shown in FIG. 1A or 1B can be manufactured, as shown in FIG. As described above, it may be manufactured in a form in which the support part does not enter the needle groove, which is the drug part, or the support part completely enters the needle groove, which is the drug part, and is formed.

And, as shown in FIG. 1A or 1B, when the support part does not enter the needle groove, which is the drug part, the central axis of each of the plurality of microneedles of the manufactured microstructure is 100 to 700 with the central axis of the nearest neighboring microneedle. It may be formed to have a separation distance of ㎛, preferably 200 ~ 600㎛ separation distance, more preferably 300 ~ 500㎛ separation distance, the separation distance is a preferred example, and the present invention is limited thereto. It is not.

In addition, the microneedle may be a conical shape, a jar shape, or a cone-shaped polyhedron having a bottom surface of a polygonal structure composed of three or more sides, and the microneedles may be 50 to 1,000 μm in height, preferably 100 to 800 μm, and , The height of the microneedles is a preferred example, and the present invention is not limited thereto.

Hereinafter, the present invention will be described in more detail based on examples. However, the scope of the present invention is limited by the following examples and should not be interpreted.

[Example]

Preparation Examples 1-1 to 1-5: Preparation of biodegradable solution and biodegradable film (single layer film)

(1) Preparation of biodegradable solution

Solid content was prepared by mixing 10% by weight of maltose, 20% by weight of glycerin, and polyvinylpyrrolidone (brand name: PVP k90) having a weight average molecular weight of about 1,000,000 to 1,500,000 with respect to the total weight of the solid content. . Next, the solid content was mixed with purified water in a weight ratio of 1:2 and stirred to prepare a biodegradable solution.

(2) monolayer film production

Next, the biodegradable solution was cast on a release film and dried in an oven at 70° C. to prepare a film. At this time, the casting thickness and drying time were changed to prepare a single layer film under the conditions of Table 1 below.

division Preparation Example 1-1 Preparation Example 1-2 Preparation Example 1-3 Preparation Example 1-4 Preparation Example 1-5 Thickness after drying (㎛) 30 50 80 50 50 Drying time (minutes) 20 20 20 10 5 Moisture content (%) 11 13.1 11.5 24 32

Examples 1-1 to 1-8: Manufacture of patch-type microneedles

Each of the single-layer films prepared in Preparation Examples 1-1 to 1-5 was passed in the roller-type mold direction and passed between rotating roller-type molds to prepare microstructures having microneedles (see FIG. 4). At this time, the temperature and speed of the roller-type mold were adjusted to be manufactured as shown in Table 2, and the roller-type mold has a plurality of concave grooves in the shape of a square pyramid having a height of 250 μm.

division Example 1-1 Example 1-2 Example 1-3 Example 1-4 Example 1-5 Example 1-6 Example 1-7 Example 1-8 Preparation Example 1-1 Preparation Example 1-1 Preparation Example 1-2 Preparation Example 1-2 Preparation Example 1-3 Preparation Example 1-4 Preparation Example 1-4 Preparation Example 1-5 Roller temperature
(℃) 40 80 60 100 100 60 60 60 Roller speed
(rpm) 5 5 10 5 3 5 3 10

6 is a micrograph of Example 1-1. In the case of Example 1-1, the temperature of the roller-type mold was too low to form a needle shape at all. Example 1-2, in which the temperature of the roller-type mold was raised to 80°C, formed a protrusion, but the shape of a pointed needle could not be formed because the inside of the groove of the roller-type mold was not completely filled. This is believed to be because the amount is not enough to fill.

Fig. 7 shows microscopic photographs of the microstructures prepared in Examples 1-3 and 1-4. In the case of Example 1-3, there was a problem that the roller speed was too fast and the temperature of the roller was too low to be sufficiently formed into a needle shape, and a needle having a blunt tip was formed, and when the temperature was increased and the speed of the roller was reduced (Example 1- 4) It was confirmed that it was well formed in a sharp needle shape.

In addition, in Example 1-5, the strength of the film was strong because the film was too thick and the moisture content in the film was low, and as a result, the formability was insufficient, and the needle shape was not well formed even when the temperature of the roller was increased and the speed was decreased. There was a problem.

In the case of Examples 1-6 and 1-7 using single-layer films having a moisture content of 24% by weight, the physical properties of the film were relatively soft and moldability was good, so that the needles were well formed even at low temperatures, and the roller speed was slow. A sharper and more uniform needle was well formed than in Example 1-6. On the other hand, in the case of Example 1-8 using a single-layer film having a water content of 32% by weight, the film had the best formability, but the shape stability was low, and thus the needle was not formed well because it was not separated from the roller.

Preparation Examples 2-1 to 2-5: Preparation of a multilayer film having a support portion and a drug portion

(1) Preparation of biodegradable solution for drug part manufacturing

A biodegradable solution having the same composition and composition ratio as the biodegradable solution of Preparation Example 1-1 was prepared.

(2) Preparation of fast-dissolving solution for manufacturing support

With respect to the total weight of the solid content, 50% by weight of fructose, 10% by weight of glycerin, and a low molecular weight HA (Hyaluronic acid) having a weight average molecular weight of 7,000 to 7,500 da of the balance were mixed to prepare a solid content. Next, the solid content and purified water were mixed and stirred at a weight ratio of 1:0.6 to prepare a fast-dissolving solution.

(3) Preparation of multilayer film

The fast-dissolving solution was cast on a release film and then dried in an oven at 70° C. for 5 minutes to prepare a fast-dissolving support layer (support) having a thickness of 20 μm.

Next, the biodegradable solution was cast on top of the support and dried in an oven at 70° C. for 20 minutes to prepare a multilayer film having a 30 μm-thick drug portion. At this time, a film was prepared under the conditions of Table 3 below by changing the casting thickness.

division Preparation Example 2-1 Preparation Example 2-2 Preparation Example 2-3 Preparation Example 2-4 Preparation Example 2-5 Drug part thickness (㎛) 30 50 80 40 10 Support thickness (㎛) 20 20 20 30 60

Examples 2-1 to 2-7: Preparation of non-patch microneedles using a plate mold

After the drug part of the multilayer film prepared in Preparation Example 2-1 was placed upward, a plate-shaped mold having a groove in the form of a microneedle was placed thereon to face the drug part.

Next, the temperature of the plate-shaped mold was set to 70° C. and pressurized at 60 kgf/cm ² for 3 minutes.

After removing the pressure, the molded film was separated from the mold to prepare a microneedle device (microstructure) having a support part and a drug part as shown in the schematic diagram of FIG. 1, and Example 2-1 was carried out. In this case, the plate-shaped mold has a plurality of concave grooves in the shape of a square pyramid having a height of 250 μm (see schematic diagram of FIG. 3).

Each microstructure was prepared in the same manner as in Example 2-1, but each of the microstructures was manufactured by varying the pressing pressure of the multilayer film and the plate-shaped mold as shown in Table 4 as shown in Table 4 below.

division Example 2-1 Example 2-2 Example 2-3 Example 2-4 Example 2-5 Example 2-6 Example 2-7 Example 2-8 Example 2-9 Example 2-10 Preparation Example 2-1 Preparation Example 2-1 Preparation Example 2-2 Preparation Example 2-2 Preparation Example 2-2 Preparation Example 2-2 Preparation Example 2-3 Preparation Example 2-4 Preparation Example 2-5 Preparation Example 2-5 Pressure
pressure
(kgf/cm ² ) 60 110 98 110 70 125 110 98 80 80

In the case of Example 2-1, there was a problem in that the pressure was too low to form a needle at all. On the other hand, in the case of Example 2-2, in which the pressure was increased to 75 kgf/cm ² or more, the support part together with the drug part well filled the inside of the groove of the plate-shaped mold and was well formed into a pointed needle shape. Examples 2-3 and 2 In the case of -4, the pressure was performed at a high pressure, but there was no significant change in the shape of the needle as compared with Example 2-2 because the drug part was filling the groove of the plate-shaped mold and the support part could not enter.

On the other hand, compared with Example 2-3, in the case of Example 2-5 in which the pressure was less than 75 kgf/cm ² , the film did not enter the end of the mold groove due to the low pressure, and thus a sharp needle was not formed. there was. In addition, in the case of Example 2-6, in which the pressure exceeded 120 kgf/cm ² , there was no difference in needle shape as compared with Example 2-4.

In addition, in the case of Example 2-7, the thickness of the drug portion was thick, so that the drug portion filled the mold groove and remained, and in Examples 2-8 and 2-9, appropriately pointed needle shapes were well formed.

In addition, in Example 2-10, a sharp needle was formed well even at a relatively low pressure due to a high ratio of the support portion during molding, but there was a problem that the drug portion in the needle occupied too little volume.

Fig. 8 shows a photograph of Example 2-3 in which the needles are the most well formed.

Examples 3-1 to 3-5: Preparation of separate microneedles using a roller-type mold

In the same manner as in Preparation Example 2-2, a multilayer film having a two-layer structure of the support part and the drug part was prepared (the thickness of the drug part 50㎛ / the thickness of the support part 20㎛).

Examples 3-1 to 3-5 were carried out by preparing microstructures having microneedles by passing the drug part of the multilayer film in the direction of the roller-type mold and passing through a roller-type mold rotating at 3 rpm (see FIG. 4). . At this time, the temperature and speed of the roller-type mold were adjusted to be prepared as shown in Table 5, and the roller-type mold has a plurality of concave grooves in the shape of a square pyramid having a height of 250 μm.

division Example 3-1 Example 3-2 Example 3-3 Example 3-4 Example 3-5 Example 3-6 Example 3-7 Mold temperature
(℃) 60 70 80 90 100 70 70 Mold speed
(rpm) 3 3 3 3 3 7 10

The photographs of the microstructures prepared in Example 3-1 and Example 3-3 are shown in FIG. 9. As the temperature of the mold increases, it can be seen that the drug layer is inserted deeper into the mold to form a sharp needle. In the case of Example 3-1, it can be seen that there is a problem that the needle-shaped end is not sharp. And, in the case of Examples 3-4 and 3-5 performed at a temperature of 90° C. or higher, and in the case of Example 3-6 performed at 7 rpm, the roll-type mold speed, when compared with Examples 3-2 to 3-3, There was no big change.

However, in the case of Example 3-7 in which the roller-type mold speed was molded at 10 rpm, there was a problem in that the film was not completely filled into the groove, and thus a sharp needle shape was not formed.

5: protrusion 10: support
20: drug part 25: physiologically active substance
100: micro needle

Claims (7)

As a method of manufacturing a microstructure in which a plurality of microneedles are formed,
A first step of casting a biodegradable solution containing a bioactive material into a mold and then solidifying to form a single layer film;
A second step of forming a microstructure having a support portion and a drug portion on the film by applying pressure to the single-layer film with a plate-shaped mold or a roller-shaped mold having an intaglio microneedle structure; And
A third step of separating the microstructure from a mold;
Performing a process including,
The microstructure has a support part and a drug part integrated, and the support part and the drug part are formed of the biodegradable solution and are integrated.
The biodegradable solution of the first step contains solid content and water in a weight ratio of 1: 0.25 to 20,
The solid content is a method for producing a microstructure for skin delivery of a physiologically active substance, characterized in that it contains 5 to 40% by weight of saccharide, 10 to 35% by weight of a plasticizer, and a remaining amount of a biodegradable polymer.
The method of claim 1, wherein the biodegradable solution in step 1 contains 10 to 3,000 parts by weight of a physiologically active substance based on 100 parts by weight of solid saccharides.
The method of claim 1, wherein the film having a single layer structure in the first step has a thickness of 15 to 300 μm.
The skin delivery of a physiologically active substance according to claim 1, wherein when forming with a plate-shaped mold in the second step, the plate-shaped mold has a temperature of 65 to 105°C and a pressure of 75 to 120 kgf/cm ² is applied to perform the molding. Method for manufacturing microstructures.
The method of claim 1, wherein when forming with a roller-type mold in the second step, the roller-type mold has a temperature of 65 to 105°C and a rotational speed of the roller-type mold is 2 to 10 rpm. Microstructure manufacturing method.
The method of claim 1, wherein the central axis of each of the plurality of microneedles is formed to have a distance of 100 to 700 μm from the central axis of the closest neighboring microneedles. .
The method of claim 1, wherein the microneedles have a height of 50 to 1,000 μm,
The microneedle is a conical shape, a jar shape, or a horn-shaped polyhedron having a polygonal bottom surface consisting of three or more sides.

Images