CN107073251A - 用于减少皱纹的微针片及形成方法 - Google Patents
用于减少皱纹的微针片及形成方法 Download PDFInfo
- Publication number
- CN107073251A CN107073251A CN201580060625.XA CN201580060625A CN107073251A CN 107073251 A CN107073251 A CN 107073251A CN 201580060625 A CN201580060625 A CN 201580060625A CN 107073251 A CN107073251 A CN 107073251A
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- Prior art keywords
- micropin
- distal portions
- skin
- mould
- kda
- Prior art date
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Abstract
本发明涉及包括多个部分的微针,其中所述多个部分包括远端部分和近端部分,所述多个部分中的至少两个由不同聚合物制成,并且所述远端部分由至少一种具有高溶胀性和高粘弹性的聚合物制成。
Description
技术领域
本发明总地涉及使用微针递送具有高溶胀性和高粘弹性的聚合物。
背景技术
角质层(SC)构成对外源物质(包括小分子量材料)的主要屏障。渗入皮肤的物质必须扩散通过SC的高度组织化的细胞间脂质双层。该细胞间微路径(其为亲脂性的)是外源物质沿着递送载体和SC之间的浓度梯度通过被动扩散经过SC屏障的主要途径。已知能够进行有效被动扩散并因此渗透通过SC屏障的分子的理想性质为小于600 Da的分子量。
对于高分子量的分子,旨在去除SC屏障的技术,如胶带剥离和抽吸、激光或者热消融是不实用的,而到目前为止无针注射还未能替代常规的基于针的递送。
在二十世纪七十年代首次提出了使用由多个微突起(microprotrusion)组成的微结构化设备来破坏角质层屏障的概念。已开发了包含固体微突起的各种设备来产生将刺穿角质层留下微观孔,并将使得能够进行随后的向内药物递送或者间隙液向外迁移的系统。本领域中已经描述使用例如硅或聚合物制备固体微突起和微针阵列,例如参见WO2009040548、US6743211、US6743211、US6743211、IE 2005/0825、US60/749.086、US6924087、US6743211、US6663820、US6743211、US 6767341、US6743211、US6663820、US6652478、US6743211、US6749792、US6451240、US6767341、US6743211、US6230051、US6908453、US7108681、US6931277B1、EP1517722B1、US20060200069A1、US6611707、US6565532、US6960193、US6743211、US6379324、WO2007/040938A1、US6256533、US6743211、US6591124、US7027478、US6603987、US6821281和US6565532。
本领域中目前已知的此类系统的使用与非常小量的药物递送的问题相关。
显然,需要稳健的替代策略来增强高分子量输送通过SC。
发明内容
如所证实的,本发明人已经显示根据本发明的微针可用高溶胀性和高粘弹性聚合物刺穿角质层。
因此,在本发明的第一方面,提供包括多个部分的微针,其中所述多个部分包括远端部分和近端部分,所述多个部分中的至少两个由不同聚合物制成,并且所述远端部分由至少一种具有高溶胀性和高粘弹性的聚合物制成。
在一个实施方案中,至少一种具有高溶胀性和高粘弹性的聚合物具有介于500kDa和100000 kDa之间、优选介于1000 kDa和20000 kDa之间、且更优选介于2100 kDa和15000 kDa之间的高分子量。
在一个实施方案中,所述具有高溶胀性和高粘弹性的聚合物选自透明质酸、交联透明质酸、聚乙二醇交联的PMVE/MA、甲基乙烯基醚的共聚物及其混合物,并且优选所述具有高溶胀性和高粘弹性的聚合物选自交联透明质酸、聚乙二醇交联的PMVE/MA、甲基乙烯基醚的共聚物及其混合物。在一个实施方案中,所述具有高溶胀性和高粘弹性的聚合物为聚乙二醇交联的PMVE/MA。
在一个实施方案中,所述远端部分包含成孔的碳酸盐试剂。在一个实施方案中,至少所述近端部分是水溶性的。在一个实施方案中,所述远端部分在插入皮肤后分离。在一个实施方案中,至少所述近端部分比所述远端部分更快降解。
在一个实施方案中,所述微针可刺穿哺乳动物的角质层。在一个实施方案中,所述远端部分是活性成分。在一个实施方案中,所述远端部分包含活性成分。在一个实施方案中,所述远端部分在插入皮肤后溶胀。在一个实施方案中,所述远端部分在插入皮肤后不到1h即溶胀。在一个实施方案中,在插入皮肤后1小时所述远端部分的直径增加到至少2倍。
在本发明的第二方面,提供包含多个所述微针的片状面膜。
在本发明的第三方面,提供所述微针在化妆品领域中和/或用于减少皮肤皱纹的用途。
在本发明的第四方面,提供一种形成包含微针阵列的片材(sheet)的方法,所述方法包括以下步骤:
(a) 提供具有对应所述微针的负形(negative)的空腔的模具,
(b) 将包含具有高溶胀性和高粘弹性的聚合物的材料的共混物填充到所述模具中以模塑(mold)远端部分,
(c) 干燥所述模具,
(d) 用可溶材料的共混物浇注(cast)所述模具,
(e) 干燥所述模具,和
(f) 从模具中取出所述微针。
附图简述
图1显示由表2中指定的配方制备的PEG交联的PMVE/MA (F1~F4)的溶胀比。
图2显示表2中指定的PEG交联的PLA的溶胀比。
图3显示透明质酸、交联透明质酸和PEG交联的PMVE/MA的溶胀比。
图4显示在动态扫频测试中凝胶的粘弹性。
图5显示通过施加压力30s插入穿过全层新生猪皮的由F2 (A)和F3 (B)配方制备的MN-1 (420 µm)和由F2 (C)和F3 (D)制备的MN-2 (280 µm)的插入后的OCT图像。
图6显示经48 h溶胀进入全层猪皮的MN-F2和MN-F3的OCT图像。
图7显示MN在不同时间间隔的体积(以mm3/cm2计)(平均值±SD,n = 5)。
图8显示在去除透明胶粘带后保持插入全层猪皮中的溶胀MN。
实施发明的最佳方式
用于输送高分子量聚合物通过生物屏障的微针
根据本发明,具有高溶胀性的聚合物是在生理盐水溶液或磷酸盐缓冲盐水中1小时体外培养(in vitro incubation)后能够溶胀至少超过10倍、优选在1小时培养后能够溶胀至少20倍、更优选在1小时培养后能够溶胀至少30倍、甚至更优选在1小时培养后能够溶胀至少40倍、并且最优选在1小时培养后能够溶胀约45-55倍的聚合物。该溶胀比可通过下面实施例部分中描述的方法来计算。
根据本发明,具有高粘弹性的聚合物是在生理盐水溶液或磷酸盐缓冲盐水中体外培养后将形成凝胶的聚合物。该凝胶在用流变仪进行的动态扫频测试中即使在低频率(0.01 Hz)下展现高弹性模量G’、高粘性模量G’’、小于1的Tan(δ) (Tan(δ) = G’’/G’)和高稠度(consistency) G* (G*2=G’2 + G’’2)。
在本申请中,提及“微针”作为所用的微突起或微突出(microprojection)的类型。本领域技术人员将理解:在许多情况下,相同的发明原理适用于使用其它微突起或微突出来穿透皮肤或其它生物膜。其它微突起或微突出可包括,例如美国专利号6,219,574 和加拿大专利申请号2,226,718中所描述的微刀片(microblade),和美国专利号6,652,478中所描述的有棱微针(edged microneedle)。总地来说,优选所述微突出具有至少约100 µm、至少约150 µm、至少约200 µm、至少约250 µm或至少约300 µm的高度。总地来说,还优选所述微突出具有不超过约1 mm、不超过约800 µm、不超过约500 µm或在一些情况下不超过约300µm的高度。所述微突出可具有至少3:1 (高度比底部直径)、至少约2:1或至少约1:1的纵横比。
在一个实施方案中,所述微针形状为具有圆形底部的圆锥形,其在底部上方逐渐变细至微针高度处的一点。合适地,在本发明的阵列的实施方案中,所述微针可在其底部具有1-500 µm的直径。在一个实施方案中,本发明的微针和用于本发明的微针可具有50-300µm范围内,例如100-200 µm的直径。在另一实施方案中,本发明的微针可具有1 µm至50 µm范围内,例如20-50 µm范围内的直径。
近端部分
在一个实施方案中,所述近端部分由一种或更多种可溶聚合物制成。所述近端部分是包含近端的部分。合适的聚合物的实例包括但不必局限于:具有低分子量(优选低于50KDa、更优选低于10KDa)的透明质酸;单糖(例如,葡萄糖、果糖、半乳糖);二糖(例如,蔗糖、乳糖、麦芽糖);低聚糖、糊精、葡聚糖、聚乙二醇、聚乙烯醇、聚(甲基乙烯基醚/马来酸酐)、聚乙烯吡咯烷酮和Gantrez类型聚合物。
在本发明的特定实施方案中,合适的聚合物是Gantrez类型聚合物如聚(甲基/乙烯基醚/马来酸) (PMVE/MA)及其酯,和聚(甲基/乙烯基醚/马来酸酐) (PMVE/MAH)。
远端部分
在一个实施方案中,所述远端部分由一种或更多种形成水凝胶的聚合物制成。所述远端部分是包含远端的部分。合适的聚合物的实例包括但不必局限于:具有高分子量(优选超过500kDa、更优选超过1000 kDa、甚至更优选超过2100 kDa)的透明质酸;交联透明质酸;交联聚乙二醇;聚乙二醇交联的聚乳酸/聚乙醇酸/乳酸-乙醇酸共聚物/聚二噁烷酮;苯乙烯-丙烯酸嵌段共聚物;聚乙二醇交联的聚(甲基/乙烯基醚/马来酸)(PEG交联的PMVE/MA);交联聚乙烯吡咯烷酮;羟基乙酸淀粉钠;纤维素;天然胶和合成胶;藻酸盐;聚丙烯酸钠和PEG-交联的 Gantrez类型聚合物(PEG 交联的Gantrez)。
Gantrez类型聚合物包括聚(甲基/乙烯基醚/马来酸)(PMVE/MA)及其酯,和聚(甲基/乙烯基醚/马来酸酐) (PMVE/MAH)。
在本发明的优选实施方案中,具有高溶胀性和高粘弹性的聚合物包含不同百分比的成孔试剂,如碳酸钠(Na2CO3)。
根据本发明,成孔试剂是能够引起聚合物上的游离酸基电离,从而排斥相邻基团并甚至进一步打开结构的试剂。
为了用于经皮递送,微针必须能够在角质层中产生开口。
合适地,当沿着微针长度在微针上施加小于50.0 N/cm2,例如小于20.0 N/cm2,如小于10 N/cm2的插入压力时所述微针不由于手动力而破裂。
远端部分的释放
根据本发明,所述近端部分由在插入皮肤后能够溶解的聚合物制成。
归功于所述近端部分的溶解和所述远端部分的体积膨胀,所述远端部分将分离并保留在皮肤中。
可结合微针片的施加来加入任选的外部水以加速近端部分的溶解,所述水在微针片之前或之后施加。
药物递送
任选地,聚合物的交联可用于进一步改变微突起的强度和溶胀特性以及微突起用于活性剂递送的释放特性。例如,在仅需要一剂的情况下,轻度交联的水凝胶微突起可快速递送药物。中度交联的水凝胶微突起可用于允许延长的药物递送,因此促进了药物持续递送进入皮肤。
微针在片状面膜中的用途
微针可具有任何合适的尺寸和形状以用于片材中来刺穿角质层。该片材的微针被设计来刺破并任选穿过角质层。合适地,可改变微针的高度以便允许穿透进入上表皮或远至深层表皮。
可改变片材中个体微针的每一个之间的顶端分离距离以确保穿透皮肤,同时具有足够小的分离距离以提供高的经皮输送速率。在该设备的实施方案中,微突起之间的顶端分离距离的范围可在50-1000 µm,如100-400 µm或200-300 µm范围内。这允许实现角质层的有效穿透和具有高溶胀性和高粘弹性的聚合物的提高的递送之间的折中。
对于本领域技术人员而言将明显的是:本发明的微针可采取任何合理的形状,包括但不限于圆锥形、棒状和/或柱形。因此(as such),所述微针可在顶端具有与底部相同的直径或者在从底部到顶端的方向上直径可逐渐变细。
用于片材的化妆品支撑物
支撑物例如选自面膜、擦拭巾(wipe)、贴片(patch),和一般而言,全部类型的多孔基底。优选地,这些支撑物具有长圆形(oblong)结构,即具有比它们被限定于其中的平面的尺寸小的厚度。
另一支撑物可例如为植绒敷贴器(flocked applicator)。该敷贴器包含例如由其表面上覆盖有植绒的弹性体或塑料制成的主体。
可切割支撑物以便呈圆盘、面膜、毛巾、手套、预切卷的形式或适合于化妆品用途的任何其它形式。
微针在化妆品领域中的用途
使用微针片递送具有高溶胀性和高粘弹性的聚合物以通过减少皱纹的出现来改善皮肤的审美外观。
基质量的减少导致皮肤厚度降低和皮肤弹性变差,引起皱纹的形成。
位于皮肤中的远端部分将随着其吸收皮肤中的水一起进一步溶胀并增加体积。皱纹部位的皮肤表面下方的这种体积膨胀从皮肤内部推动皱纹并使得皱纹变得更浅和更宽。
在特定实施方案中,本发明的微针可用于向皮肤施加半永久或永久标记。
制造微针的方法
一种形成微针阵列的方法,包括以下步骤:
(a) 提供具有对应所述微针的负形的空腔的模具,
(b) 将具有高溶胀性和高粘弹性的材料的共混物填充到浇注用模具中以模塑远端部分,
(c) 在室温下干燥若干小时,
(d) 用可溶材料的共混物浇注所述模具,
(e) 在室温下干燥(并且任选加热),和
(f) 从模具取出所述微针并将片材切成所需形状。
在阅读以下描述(仅通过举例方式给出)并参考附图后,将更好地理解本发明。
实施例
在测试1和测试2中筛选PEG交联的PMVE/MA、PEG交联的聚乳酸、透明质酸和交联透明质酸的可溶胀材料,以从溶胀性能和粘弹性(其是皮肤中的膨胀(plumping)和固定的适合性的指示)的角度选择用于微针的远端部分的材料。将基于测试1和2中的结果选择的可溶胀材料用于微针的成型(prototyping)。在测试3和测试4中进一步研究了这些原型经48小时的插入和皮肤内溶胀。
远端部分的材料选择:体外溶胀性能
测试材料
PEG交联的PMVE/MA:通过在室温下干燥含水聚合物共混物(表1) 48小时并在烘箱中在80℃下固化24小时以诱导PEG和PMVE/MA (Gantrez® S-97)之间的化学交联来制备样品F1-4:
表1. PEG交联的PMVE/MA (PEG-PMVE/MA)的配方
样品(wt%) | PMVE/MA | PEG 10 kDa | Na2CO3 | 去离子水 |
F1 | 20 | 7.5 | 3 | 69.5 |
F2 | 20 | 7.5 | 5 | 67.5 |
F3 | 15 | 7.5 | 3 | 74.5 |
F4 | 15 | 7.5 | 5 | 72.5 |
PEG交联的聚乳酸(PEG-PLA)
表2. 用于测试的PEG交联的聚乳酸(PEG-PLA)
EDL-40 | (DL) PEG-PLA,PEO 40 mol% |
EDL-50 | (DL) PEG-PLA,PEO 50 mol% |
EDL-60 | (DL) PEG-PLA,PEO 60 mol% |
EL-40 | (L) PLA-co-PEG,PEO 40 mol% |
高分子量透明质酸和交联透明质酸
表3. 高分子量透明质酸(HA)和交联透明质酸(HA)
交联HA | 交联透明质酸 |
HA-1 | 透明质酸,分子量为1300-1800kDa |
HA-2 | 透明质酸,分子量为1800-2150kDa |
HA-3 | 透明质酸,分子量为2200kDa |
测试方法:
将测试材料称重为W 0 并在生理盐水溶液中在室温下经7小时溶胀。在定期间隔移走所述材料,用滤纸擦拭以除去过量水并称重为W t 。使用以下等式计算溶胀比,并然后画成图。
t时刻的溶胀比=。
结果
图1显示PEG交联的PMVE/MA (F1~F4)的溶胀比。在10 min中后中断了F4的溶胀研究,这是因为F4是溶解而不是溶胀;然而,Na2CO3的添加导致溶胀显著增加。F2和F3在溶胀时具有高的流体吸收能力并还具有良好的机械强度。
PEG交联的PLA的溶胀性能:
图2显示了表2中指定的PEG交联的PLA的溶胀比。发现这些材料的溶胀性能展现以下顺序:EDL-60 > EL-40 > EDL-50 > EDL-40。
高分子量HA、交联HA和PEG交联的PMVE/MA (F2和F3)的溶胀性能:
图3比较了透明质酸(HA-1~3)、交联透明质酸和PEG交联的PMVE/MA (F2和F3)的溶胀性能。高分子量HA在7小时培养期间显示更好的溶胀,且在具有高分子量的三种HA中HA-3显示最快的溶胀和最高的溶胀比。发现这些材料的溶胀性能展现以下顺序:交联HA > F3 > HA-3 > HA-2 > F2 > HA-1。
结论:
发现所选材料的溶胀性能展现以下顺序:交联HA > F3 > HA-3 > HA-2 > F2 > HA-1。
远端部分的材料选择:体外粘弹性
测试材料
交联HA | 交联透明质酸 |
HA-1 | 透明质酸,分子量为1300-1800kDa |
HA-2 | 透明质酸,分子量为1800-2150kDa |
HA-3 | 透明质酸,分子量为2200kDa |
F2 | 通过在室温下干燥表2中的含水聚合物共混物F2 48小时并在烘箱中在80℃下固化24小时以诱导PEG和PMVE/MA之间的化学交联来制备 |
F3 | 通过在室温下干燥表2中的含水聚合物共混物F3 48小时并在烘箱中在80℃下固化24小时以诱导PEG和PMVE/MA之间的化学交联来制备 |
测试方法:
将测试材料放入滤器(strainer)中并在室温下在生理盐水溶液中培养以模拟皮肤内的溶胀。在7小时后,测试材料在滤器中溶胀并形成凝胶。移走这些凝胶并用滤纸擦拭以除去过量水。使用流变仪在动态扫频测试中在以下条件下测定粘弹性:
几何形状:椎板几何形状
测试设置:动态扫频测试(应变控制)
应变:0.1%
温度:32℃
初始频率:0.01 Hz
最终频率:10 Hz
10倍频点数:10
使用以下等式计算tan (δ)和G * ,并然后画成图。
。
结果:
图4显示使用流变仪测定的凝胶的粘弹性。值低于1的Tan(δ)意味着弹性行为比粘性特征更强,其中材料表现地更像凝胶。该物理化学行为是皮肤中的膨胀和固定的适合性的指示,特别是在主要模拟与皮肤接触的低频0.01-0.1 Hz的情况下。因此,根据tan(δ)的值,材料的用于固定的凝胶行为展现以下顺序:交联HA、F3、F2、HA-3、HA-1和HA-2。较高的G*意味着较高的凝胶硬度,其表明抵抗皮肤挤压以保持形状的能力。根据G*的值,特别是低频下的G*值,材料的硬度展现以下顺序:F3、交联HA、F2、HA-1、HA-3和HA-2。
结论
评价的大多数材料具有低tan(δ)和高G*,这有益于在皮肤内的形状保持和固定。发现三种最好的材料是F3、交联HA和F2。因为溶胀性能展示交联HA > F3 > HA-3 > HA-2 > F2> HA-1的顺序,所以溶胀性能和粘弹性需要平衡以选择用于微针的远端部分的材料。发现F2、F3和交联HA用于微针的远端部分是最好的。
具有PEG交联的PMVE/MA (F2 /F3)作为远端部分的微针(MN)的皮肤内插入
测试样品:
样品 | 针长度 | 远端部分 | 近端部分 |
MN-1-F2 | 420 µm | 表2中的F2 | PMVE/MA (Gantrez® S-97) |
MN-1-F3 | 420 µm | 表2中的F3 | PMVE/MA (Gantrez® S-97) |
MN-2-F2 | 280µm | 表2中的F2 | PMVE/MA (Gantrez® S-97) |
MN-2-F3 | 280µm | 表2中的F3 | PMVE/MA (Gantrez® S-97) |
测试方法:
微针的制备:
根据以下图解表示以两步骤方法使用高度为420 µm的MN-1的模具和高度为280 µm 的MN-2的模具制备微针(MN):
将0.05 g的F2或F3共混物(表2)放入模具中并用刮铲将该共混物铺展以覆盖MN孔的整个区域。
将MN模具离心以迫使该共混物进入MN孔中。
使MN在室温下干燥。
然后,将PMVE/MA (Gantrez® S-97)浇注进入模具中。
将MN模具离心以迫使该共混物进入MN孔中。
然后使MN干燥并放入80℃的烘箱中保持24 h。
然后从模具中移走MN并用热手术刀切割侧壁。
。
MN离体(ex vivo)穿透进入皮肤
将全层离体猪皮放置在用磷酸盐缓冲盐水润湿的织物床(a bed of tissue)上以模拟间隙液的底流(underflow)。将该皮肤拉紧并用金属别针固定在支撑物上以模拟体内的情况。用拇指经30秒将MN样品手动插入全层新生猪皮内,施加的力与按压按钮以呼叫电梯时所用的力类似。使用透明胶粘带将MN保持在合适位置。使用光学相干断层成像术(OCT)评定MN进入皮肤中的穿透深度。
结果
图5显示MN(MN-1-F2/F3和MN-2-F2/F3)穿过全层新生猪皮的穿透深度,且表4显示不同MN的平均插入深度。观察到的穿透变化性可通过从相同MN阵列的不同MN观察到的不同穿透速率解释。所有由F2和F3制成的针成功地穿透到皮肤中,如下面的OCT图像(图4)中所示。大约MN-1-F2/F3长度的74% (~310 µm)和MN-2-F2/F3长度的72% (~200 µm)穿透到皮肤中。
表4. 不同MN阵列的穿透深度平均值(平均值±S.D.,n=4)
测试样品 | 插入深度(µm) | 穿透的皮肤层 |
MN-1-F2 | 313 ± 13 | 真皮 |
MN-1-F3 | 309 ± 4 | 真皮 |
MN-2-F2 | 198 ± 16 | 表皮 |
MN-2-F3 | 207 ± 9 | 表皮 |
结论
使用F2和F3材料作为远端部分和可溶Gantrez作为近端部分成功地制备了两种原型。两种原型都以它们总长度的平均72–74%穿透到皮肤中而没有破坏,如OCT图像中所示。
具有PEG- PMVE/MA(F2/F3)作为远端部分的微针(MN)的皮肤内溶胀
测试样品:
样品 | 针长度 | 远端部分 | 近端部分 |
MN-F2 | 600 µm | 表2中的F2 | PMVE/MA (Gantrez® S-97) |
MN-F3 | 600 µm | 表2中的F3 | PMVE/MA (Gantrez® S-97) |
使用高度为600 µm的MN的模具按照第8页上的测试3中详述的程序以两步骤方法制备微针。
测试方法:
MN进入皮肤中的溶胀
将全层离体猪皮放置在凝胶创伤敷料上,并在磷酸盐缓冲盐水中预平衡24小时以模拟间隙液的底流。将该皮肤拉紧并用金属别针固定在支撑物上以模拟体内的情况。将MN手动插入皮肤内。在实验期间在37℃的培养箱中保持此设置。使用OCT监测MN进入皮肤中的溶胀,并研究设定时间:0、0.5、1、3、6、24和48 h的MN体积的变化。
结果
使用高度为600 µm的MN的模具将MN-F2和MN-F3按照其尺寸成型。图6显示MN-F2和MN-F3在不同时间间隔展示形状变化并在皮肤中溶胀。观察到MN-F2和MN-F3的远端部分保持使皮肤膨胀并保留在皮肤内至少48小时。
图7画出在48小时插入皮肤期间每cm2 由MN所占体积。使用不同时间点单个MN的平均体积进行计算;MN阵列覆盖0.5 x 0.5 cm的表面,其中有361个MN。在插入皮肤中48小时后,在测定为1 cm2的表面上由MN-F2和MN-F3所占的流体体积分别为21.02±5.29和23.08±4.65 µl/cm2。如图7中所示,发现与MN-F2相比,在不同时间点MN-F3所占的总体积更大,表明两种MN的远端部分的溶胀都在插入皮肤中后立即开始并持续至少48小时。
在施加后,如图8中所示,MN-F2和MN-F3的远端部分保持插入皮肤中,这是由于可溶近端部分的溶解。
结论
使用F2和F3作为远端部分将MN-F2和MN-F3按照其尺寸成型。这两种MN的远端部分在施加后成功地保留在皮肤中。在48小时插入皮肤期间充分观察到这两种MN的远端部分的溶胀,且MN-F3显示比MN-F2更好的溶胀(约5倍溶胀)。观察到它们在皮肤中的膨胀和固定持续至少48小时。
Claims (18)
1.一种微针,其包括多个部分,其中所述多个部分包括远端部分和近端部分,所述多个部分中的至少两个由不同聚合物制成,并且所述远端部分由至少一种具有高溶胀性和高粘弹性的聚合物制成。
2.根据权利要求1所述的微针,其中所述至少一种具有高溶胀性和高粘弹性的聚合物具有介于500 kDa和100000 kDa之间、优选介于1000 kDa和20000 kDa之间、且更优选介于2100 kDa和15000 kDa之间的高分子量。
3.根据权利要求1或2所述的微针,其中所述具有高溶胀性和高粘弹性的聚合物选自透明质酸、交联透明质酸、聚乙二醇交联的PMVE/MA、甲基乙烯基醚的共聚物及其混合物,并且优选所述具有高溶胀性和高粘弹性的聚合物选自交联透明质酸、聚乙二醇交联的PMVE/MA、甲基乙烯基醚的共聚物及其混合物。
4.根据权利要求3所述的微针,其中所述具有高溶胀性和高粘弹性的聚合物为聚乙二醇交联的PMVE/MA。
5.根据权利要求1至4中任一项所述的微针,其中所述远端部分包含成孔的碳酸盐试剂。
6.根据权利要求1至5中任一项所述的微针,其中至少所述近端部分是水溶性的。
7.根据权利要求1至6中任一项所述的微针,其中所述远端部分在插入皮肤后分离。
8.根据权利要求1至7中任一项所述的微针,其中至少所述近端部分比所述远端部分更快降解。
9.根据权利要求1至8中任一项所述的微针,其中所述微针可刺穿哺乳动物的角质层。
10.根据权利要求1至9中任一项所述的微针,其中所述远端部分是活性成分。
11.根据权利要求1至10中任一项所述的微针,其中所述远端部分包含活性成分。
12.根据权利要求1至11中任一项所述的微针,其中所述远端部分在插入皮肤后溶胀。
13.根据权利要求1至12中任一项所述的微针,其中所述远端部分在插入皮肤后不到1h即溶胀。
14.根据权利要求1至13中任一项所述的微针,其中在插入皮肤后1小时所述远端部分的直径增加到至少2倍。
15.一种片状面膜,其包含多个根据权利要求1至14中任一项所述的微针。
16.根据权利要求1至14中任一项所述的微针在化妆品领域中的用途。
17.根据权利要求1至14中任一项所述的微针用于减少皮肤皱纹的用途。
18.一种形成包含微针阵列的片材的方法,所述方法包括以下步骤:
(a) 提供具有对应所述微针的负形的空腔的模具,
(b) 将包含具有高溶胀性和高粘弹性的聚合物的材料的共混物填充到所述模具中以模塑远端部分,
(c) 干燥所述模具,
(d) 用可溶材料的共混物浇注所述模具,
(e) 干燥所述模具,和
(f) 从所述模具中取出所述微针。
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EP3220997A1 (en) | 2017-09-27 |
WO2016076442A1 (en) | 2016-05-19 |
KR20170056688A (ko) | 2017-05-23 |
US11097086B2 (en) | 2021-08-24 |
JP2016093325A (ja) | 2016-05-26 |
US20170304602A1 (en) | 2017-10-26 |
ES2939972T3 (es) | 2023-04-28 |
JP6906885B2 (ja) | 2021-07-21 |
EP3220997B1 (en) | 2022-12-28 |
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