WO2016076442A1 - Micro-needle sheet for reducing wrinkles and method of forming - Google Patents
Micro-needle sheet for reducing wrinkles and method of forming Download PDFInfo
- Publication number
- WO2016076442A1 WO2016076442A1 PCT/JP2015/082633 JP2015082633W WO2016076442A1 WO 2016076442 A1 WO2016076442 A1 WO 2016076442A1 JP 2015082633 W JP2015082633 W JP 2015082633W WO 2016076442 A1 WO2016076442 A1 WO 2016076442A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- end portion
- distal end
- skin
- microneedle according
- microneedle
- Prior art date
Links
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- KIUKXJAPPMFGSW-DNGZLQJQSA-N (2S,3S,4S,5R,6R)-6-[(2S,3R,4R,5S,6R)-3-Acetamido-2-[(2S,3S,4R,5R,6R)-6-[(2R,3R,4R,5S,6R)-3-acetamido-2,5-dihydroxy-6-(hydroxymethyl)oxan-4-yl]oxy-2-carboxy-4,5-dihydroxyoxan-3-yl]oxy-5-hydroxy-6-(hydroxymethyl)oxan-4-yl]oxy-3,4,5-trihydroxyoxane-2-carboxylic acid Chemical compound CC(=O)N[C@H]1[C@H](O)O[C@H](CO)[C@@H](O)[C@@H]1O[C@H]1[C@H](O)[C@@H](O)[C@H](O[C@H]2[C@@H]([C@@H](O[C@H]3[C@@H]([C@@H](O)[C@H](O)[C@H](O3)C(O)=O)O)[C@H](O)[C@@H](CO)O2)NC(C)=O)[C@@H](C(O)=O)O1 KIUKXJAPPMFGSW-DNGZLQJQSA-N 0.000 claims description 29
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Classifications
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-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/0085—Copolymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/753—Medical equipment; Accessories therefor
- B29L2031/7544—Injection needles, syringes
Definitions
- the invention relates generally to delivery of a polymer with high swellability and high
- the Stratum Corneum (SC) constitutes the main barrier to exogenous substances, including small molecular weight material. Substances permeating the skin must diffuse through the highly organized intercellular lipid bilayers of the SC. This intercellular microroute, which is lipophilic, is the primary pathway for exogenous substances to pass through the SC barrier by passive diffusion along a concentration gradient between a delivery vehicle and the SC.
- the ideal property of a molecule capable of effective passive diffusion, and thus, penetration through the SC barrier is known to be a molecular mass less than 600 Da.
- microneedles according to the invention can puncture the stratum corneum with a high swellability and high viscoelasticity polymer.
- a microneedle comprising a plurality of portions, wherein the plurality of portions comprise a distal end portion and a proximal end portion, at least two of the plurality of portions are made of different polymers, and the distal end portion is made of at least one polymer with high swellability and high viscoelasticity.
- At least one polymer with high swellability and high viscoelasticity has a high molecular weight between 500 kDa and 100000 kDa, preferably between 1000 kDa and 20000 kDa, and more preferably between 2100 kDa and 15000 kDa.
- the polymer with high swellability and high viscoelasticity is selected from the group consisting of hyaluronic acid, cross-linked hyaluronic acid, polyethylene glycol cross-linked PMVE/MA, a copolymer of methyl vinyl ether and a mixture thereof, and preferably the polymer with high swellability and high viscoelasticity is selected from the group consisting of cross-linked hyaluronic acid, polyethylene glycol cross-linked PMVE/MA, a copolymer of methyl vinyl ether and a mixture thereof.
- the polymer with high swellability and high viscoelasticity is polyethylene glycol cross-linked PMVE/MA.
- the distal end portion contains a pore-forming carbonate agent. In one embodiment, at least the proximal end portion is water-dissolvable. In one embodiment, the distal end portion detaches following insertion into skin. In one embodiment, at least the proximal end portion degrades more rapidly than the distal end portion.
- the microneedle can puncture the stratum corneum of a mammal.
- the distal end portion is an active ingredient.
- the distal end portion comprises an active ingredient.
- the distal end portion swells upon insertion into the skin.
- the distal end portion swells upon insertion into the skin in less than lh.
- the diameter of the distal end portion increases at least 2 times in one hour after insertion into the skin.
- a sheet mask comprising a plurality of the microneedles.
- a use of the microneedle in a cosmetic field and/or for reducing skin wrinkles is provided.
- a method of forming a sheet comprising an array of microneedles comprising the steps of:
- Figure 1 shows swelling ratio of the PEG cross-linked PMVE/MA (F1-F4) prepared from the formulations specified in Table 2.
- Figure 2 shows swelling ratio of the PEG cross-linked PLAs specified in Table 2.
- Figure 3 shows swelling ratio of hyaluronic acids, cross-linked hyaluronic acid and PEG cross-linked PMVE/MA.
- Figure 4 shows viscoelasticity of the gels in dynamic frequency sweep test.
- Figure 5 shows OCT images after insertion of MN-1 (420 ⁇ ) prepared from F2 (A) and F3 (B) formulations and MN-2 (280 ⁇ ) prepared from F2 (C) and F3 (D) inserted across full-thickness neonatal porcine skin by applying pressure for 30 s.
- Figure 6 shows OCT images of MN-F2 and MN-F3 swelling over 48 h into full-thickness porcine skin.
- Figure 8 shows swollen MNs left inserted in the full-thickness porcine skin after the removal of the transparent adhesive tape.
- a polymer with high swellability is a polymer able to swell at least over 10 times in a 1-hour in vitro incubation in a physiological saline solution or phosphate buffered saline, preferably at least 20 times in 1-hour incubation, more preferably at least 30 times in 1-hour incubation, even more preferably at least 40 times in 1-hour incubation, and most preferably about 45-55 times in 1-hour incubation.
- This swelling ratio can be calculated by the method described in the example section below.
- a polymer with high viscoelasticity is a polymer that will form a gel after the in vitro incubation in a physiological saline solution or phosphate buffered saline.
- microprotrusions as the type of microprotrusion or microprojection which is being employed. It will be understood by persons of skill in the art that in many cases the same inventive principles apply to the use of other microprotrusions or microprojections to penetrate skin or other biological membranes.
- Other microprotrusions or microprojections may include, for example, microblades as described in U.S. Patent No. 6,219,574 and Canadian Patent Application No. 2,226,718, and edged microneedles as described in U.S. Patent No. 6,652,478.
- the microprojections have a height of at least about 100 ⁇ , at least about 150 ⁇ , at least about 200 ⁇ , at least about 250 ⁇ , or at least about 300 ⁇ . In general, it is also preferred that the microprojections have a height of no more than about 1 mm, no more than about 800 ⁇ , no more than about 500 ⁇ , or in some cases no more than about 300 ⁇ .
- the microprojections may have an aspect ratio of at least 3 : 1 (height to diameter at base), at least about 2: 1 , or at least about 1 :1.
- the microneedles are conical in shape with a circular base which tapers to a point at a height of the microneedle above the base.
- the microneedles can have a diameter of 1 - 500 ⁇ at their base.
- the microneedles of and for use in the invention can have a diameter in the range 50-300 ⁇ , for example 100-200 ⁇ .
- the microneedles of the invention may be of a diameter in the range of 1 ⁇ to 50 ⁇ , for example in the range of 20-50 ⁇ .
- the proximal end portion is made of one or more soluble polymers.
- the proximal end portion is a portion comprising proximal end.
- suitable polymers include, but are not necessarily limited to, hyaluronic acid with low molecular weight (preferably less than 50KDa, more preferably less than lOKDa); monosaccharide (for example, glucose, fructose, galactose); disaccharide (for example, sucrose, lactose, maltose); oligosaccharide, dextrin, dextran, polyethylene glycol, polyvinyl alcohol, poly (methyvinylether/maleic anhydride), polyvinylpyrrolidone, and Gantrez-type polymers.
- suitable polymers are Gantrez-type polymers such as poly(methyl/vinyl ether/maleic acid) (PMVE MA) and esters thereof, and poly(methyl/vinyl ether/maleic anhydride) (PMVE/MAH).
- Gantrez-type polymers such as poly(methyl/vinyl ether/maleic acid) (PMVE MA) and esters thereof, and poly(methyl/vinyl ether/maleic anhydride) (PMVE/MAH).
- the distal end portion is made of one or more hydrogel-forming polymers.
- the distal end portion is a portion comprising distal end.
- suitable polymers include, but are not necessarily limited to, hyaluronic acid with high molecular weight (preferably more than 500kDa, more preferably more than 1000 kDa, even more preferably more than 2100 kDa);
- cross-linked hyaluronic acid cross-linked polyethylene glycol; polyethylene glycol cross-linked poly-lactic acid/poly glycolic acid/poly-lactic-co-glycolic acid/poly dioxanone;
- Gantrez-type polymers include poly(methyl/vinyl ether/maleic acid) (PMVE MA) and esters thereof, and poly(methyl/vinyl ether/maleic anhydride) (PMVE/MAH).
- the polymer with high swellability and high viscoelasticity contains different percentages of a pore-forming agent, such as sodium carbonate (Na 2 C0 3 ).
- a pore-forming agent is an agent able to cause free acid groups on the polymer to ionise, thus repelling adjacent groups and opening up the structure even further.
- microneedles In order to be used in transdermal delivery, microneedles must be capable of creating openings in the stratum corneum.
- the microneedles do not fracture with manual force when a pressure of insertion of less than 50.0 N cm 2 , for example less than 20.0 N cm 2 , such as less than 10 N cm 2 is exerted on microneedles along their length.
- the proximal end portion is made of a polymer capable of being dissolved after insertion into the skin.
- the distal end portion will separate and remain in the skin.
- Optional external water can be added to accelerate the dissolution of the proximal end portion combined with the application of a microneedle sheet which is applied before or after the microneedle sheet.
- crosslinking of polymers may be used to further vary the strength and swelling characteristics of microprotrusions as well as the release characteristics of the microprotrusions for delivery of an active agent.
- a lightly-crosslinked hydrogel microprotrusion could rapidly deliver a drug where only one dose is required.
- a moderately-crosslinked hydrogel microprotrusion could be used to allow prolonged drug delivery, thus facilitating a constant drug delivery into the skin.
- a microneedle can be any suitable size and shape for use in a sheet to puncture the stratum corneum.
- the microneedles of the sheet are designed to pierce and optionally cross the stratum corneum.
- the height of the microneedles can be altered so as to allow penetration into the upper epidermis or as far as the deep epidermis.
- the apical separation distance between each of the individual microneedles in a sheet can be modified to ensure penetration of the skin while having a sufficiently small separation distance to provide high transdermal transport rates.
- the range of apical separation distances between microprotrusions can be in the range of 50-1000 ⁇ , such as 100-400 ⁇ ⁇ , or 200-300 ⁇ . This allows a compromise to be achieved between efficient penetration of the stratum corneum and enhanced delivery of the polymer with high swellability and high
- microneedles of the invention can take any reasonable shape, including, but not limited to, cones, rods and/or pillars. As such, the
- microneedles may have the same diameter at the tip as at the base or may taper in diameter in the direction from the base to the tip.
- Supports are, for example, chosen from masks, wipes, patches, and in general all types of porous substrates.
- these supports have an oblong structure, namely with a thickness smaller than the dimensions of the plane in which they are defined.
- Another support may, for example, be a flocked applicator.
- This applicator comprises, for example, a body made of elastomer or of plastic, covered on its surface with a flocking.
- the support may be cut so as to be in the form of a disc, a mask, a towel, a glove, a precut roll, or any other form suitable for a cosmetic use.
- the microneedle sheet is used to deliver a polymer with high swellability and high viscoelasticity to improve the aesthetic appearance of the skin, by reducing the appearance of wrinkles.
- a reduction in the amount of matrix leads to a decrease in skin thickness and deterioration of skin elasticity, causing the formation of wrinkles.
- the distal end portion located in the skin will further swell and increase volume along with its absorption of water in the skin.
- Such volume expansion beneath the skin surface of a wrinkle site pushes the wrinkles from inside the skin and makes the wrinkles become shallower and wider.
- the microneedles of the invention can be used to apply semi-permanent or permanent marking to the skin.
- a method of forming an array of microneedles comprising the steps of:
- the swellable materials of PEG cross-linked PMVE/MA, PEG cross-linked poly- lactic acid, hyaluronic acid, and cross-linked hyaluronic acid were screened in test 1 and test 2 to select the material for distal end portion of the microneedles from the point view of the swelling property and the viscoelasticity which is indicative of suitability for plumping and fixation in the skin.
- the swellable materials selected based on the results in the tests 1 and 2 were used in the prototyping of the microneedles.
- the insertion and the in-skin swelling of these prototypes over 48 hours were further investigated in test 3 and test 4.
- PEG cross-linked PMVE/MA Samples Fl-4 were prepared by drying the aqueous polymeric blends (Table 1) for 48 hours at room temperature and curing at 80°C in an oven for 24 hours to induce chemical crosslinking between PEG and PMVE MA (Gantrez® S-97):
- PEG cross-linked poly-lactic acid (PEG-PLAs) Table 2.
- PEG cross-linked poly-lactic acid (PEG-PLAs) for test
- test materials were weighed as Wo and were swollen in a physiological saline solution over 7 hours at room temperature. At regular intervals, the materials were removed, wiped with filter paper to eliminate excess water and weighed as W t .
- the swelling ratio was calculated using the following equation and then plotted into a graph.
- Figure 1 shows the swelling ratio of the PEG cross-linked PMVE/MA (F1 ⁇ F4).
- the swelling study of F4 was interrupted after 10 min because F4 was dissolving instead of swelling; however, the addition of Na 2 C0 3 led to a significant increase in swelling.
- F2 and F3 had high fluid uptake capacity and also good mechanical strength when swollen.
- Figure 2 shows the swelling ratio of the PEG cross-linked PLAs specified in Table 2.
- the swelling properties of these materials was found to exhibit the following order: EDL-60 > EL-40 > EDL-50 > EDL-40.
- PMVE/MA (F2 and F3): Figure 3 compares the swelling property of hyaluronic acids (HA-1-3), cross-linked hyaluronic acid, and PEG cross-linked PMVE/MA (F2 and F3). High molecular weight HA showed better swelling over the 7 hour-incubation, and HA-3 showed the quickest swelling and highest swelling ratio among the three HAs with high molecular weight. The swelling properties of these materials was found to exhibit the following order: cross-linked HA > F3 > HA-3 > HA-2 > F2 > HA-1.
- the swelling property of selected materials was found to exhibit the following order: cross-linked HA > F3 > HA-3 > HA-2 > F2 > HA-1.
- test materials were put in strainers and incubated in a physiological saline solution at room temperature to mimic the swelling in skin. After 7 hours, the test materials swelled and formed gels in the strainers. These gels were removed and wiped with filter paper to eliminate excess water. The viscoelasticity was measured with a Rheometer in a dynamic frequency sweep test under the following conditions:
- Test setup Dynamic Frequency Sweep test (strain control)
- Figure 4 shows the viscoelasticity of the gels measured with Rheometer.
- Tan ( ⁇ ) with a value lower than 1 means more elastic behavior than viscous character, in which the material behaves more like a gel.
- This physicochemical behavior is indicative of suitability for plumping and fixation in the skin, especially in the case of low frequency 0.01-0.1 Hz that mostly mimics the contact with skin. Therefore, according to the value of tan ( ⁇ ), the gel behavior of the materials for fixation exhibited the following order: cross-linked HA, F3, F2, HA-3, HA-1 and HA-2.
- a higher ⁇ * means higher firmness of the gels, which indicates the potential to resist compression by skin to maintain the shape.
- G* especially at low frequency the firmness of the materials is exhibited the following order: F3, cross- linked HA, F2, HA-1, HA-3 and HA-2.
- microneedles were prepared in a two-step process according to the following diagrammatic representation using the molds of MN-1 with a height of 420 ⁇ and the molds of MN-2 with a height of 280 ⁇ .
- the MN molds were centrifuged to force the blend into the MN holes.
- the MNs were left to dry at room temperature.
- PMVE MA Gantrez® S-97
- the MN molds were centrifuged to force the blend into the MN holes.
- the MNs were then left to dry and put into the oven at 80°C for 24 h.
- the MNs were removed from the molds and the side walls were cut with a warm scalpel.
- Figure 5 shows the penetration depth of the MNs (MN-1-F2/F3 and MN-2-F2/F3) across full-thickness neonatal porcine skin, and Table 4 shows the average insertion depth of the different MNs.
- the observed penetration variability can be explained by the different penetration rate observed from the different MNs of the same MN array. All the needles made of F2 and F3 successfully penetrated into skin as indicated in the OCT images below ( Figure 4). Approximately 74 % of the length of MN-1-F2/F3 (-310 ⁇ ) and 72 % of the length of MN-2-F2/F3 (-200 ⁇ ) penetrated into the skin.
- microneedles were prepared in a two-step process following the procedure detailed in Test 3 on page 8 using the molds of MN with a height of 600 ⁇ .
- Full-thickness excised pig skin was set onto a gel wound dressing, and pre-equilibrated in phosphate buffered saline for 24 hours in order to simulate the underflow of interstitial fluid.
- the skin was tensed and fixed with metal pins on a support to simulate an in vivo situation.
- the MNs were manually inserted into the skin.
- the set up was kept in an incubator at 37°C during the experiment.
- OCT was used to monitor the swelling of the MNs into the skin, and the variation of MN volume was studied at set times: 0, 0.5, 1, 3, 6, 24 and 48 h.
- MN-F2 and MN-F3 were prototyped in line with their dimensions using the molds of MN with a height of 600 ⁇ .
- Figure 6 shows that MN-F2 and MN-F3 exhibited a change in shape and swelled in the skin at different time intervals. The distal end portion of MN-F2 and MN-F3 was observed to keep plumping the skin and staying in the skin at least for 48 hours.
- Figure 7 plotted the volume taken up by the MNs per cm over 48 hour-insertion in skin. The calculations were carried out using the average volume of a single MN at the different time points; the MN arrays cover a surface of 0.5 x 0.5 cm, in which there are 361 MN. After 48 hours of insertion in the skin, the volume of fluid taken up by MN-F2 and MN-F3 on a surface measuring 1 cm was 21.02 ⁇ 5.29 and 23.08 ⁇ 4.65 ⁇ /cm , respectively.
- the overall volume taken up by MN-F3 was found to be greater at the different time points in comparison to MN-F2, indicating the swelling of the distal end portion of both MNs begins immediately after the insertion into skin and lasts for at least 48 hours.
- MN-F2 and MN-F3 were prototyped in line with their dimensions using F2 and F3 as the distal end portion.
- the distal end portion of the two MNs was successfully left in the skin after the application.
- the swelling of the distal end portion of the two MNs was well observed during the 48 hour-insertion in the skin, and MN-F3 showed better swelling (about 5 times swelling) than MN-F2.
- Their plumping and fixation in the skin were observed to last for at least 48 hours.
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Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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US15/516,215 US11097086B2 (en) | 2014-11-14 | 2015-11-13 | Micro-needle sheet for reducing wrinkles |
EP15816258.6A EP3220997B1 (en) | 2014-11-14 | 2015-11-13 | Cosmetic use for reducing wrinkles of a microneedle |
KR1020177010516A KR20170056688A (en) | 2014-11-14 | 2015-11-13 | Micro-needle sheet for reducing wrinkles and method of forming |
ES15816258T ES2939972T3 (en) | 2014-11-14 | 2015-11-13 | Cosmetic use to reduce wrinkles of a microneedle |
CN201580060625.XA CN107073251A (en) | 2014-11-14 | 2015-11-13 | Micropin piece and forming method for reducing wrinkle |
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JP2014231306A JP6906885B2 (en) | 2014-11-14 | 2014-11-14 | Microneedle sheet to reduce wrinkles |
JP2014-231306 | 2014-11-14 |
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WO2016076442A1 true WO2016076442A1 (en) | 2016-05-19 |
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PCT/JP2015/082633 WO2016076442A1 (en) | 2014-11-14 | 2015-11-13 | Micro-needle sheet for reducing wrinkles and method of forming |
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US (1) | US11097086B2 (en) |
EP (1) | EP3220997B1 (en) |
JP (1) | JP6906885B2 (en) |
KR (1) | KR20170056688A (en) |
CN (1) | CN107073251A (en) |
ES (1) | ES2939972T3 (en) |
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Also Published As
Publication number | Publication date |
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JP6906885B2 (en) | 2021-07-21 |
KR20170056688A (en) | 2017-05-23 |
EP3220997A1 (en) | 2017-09-27 |
ES2939972T3 (en) | 2023-04-28 |
EP3220997B1 (en) | 2022-12-28 |
US20170304602A1 (en) | 2017-10-26 |
CN107073251A (en) | 2017-08-18 |
US11097086B2 (en) | 2021-08-24 |
JP2016093325A (en) | 2016-05-26 |
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