Intracutaneous microneedle array apparatus

    公开(公告)号:US06931277B1

    公开(公告)日:2005-08-16

    申请号:US09580819

    申请日:2000-05-26

    摘要: Improved microneedle arrays are provided having a sufficiently large separation distance between each of the individual microneedles to ensure penetration of the skin while having a sufficiently small separation distance to provide high transdermal transport rates. A very useful range of separation distances between microneedles is in the range of 100–300 microns, and more preferably in the range of 100–200 microns. The outer diameter and microneedle length is also very important, and in combination with the separation distance will be crucial as to whether or not the microneedles will actually penetrate the stratum corneum of skin. For circular microneedles, a useful outer diameter range is from 20–100 microns, and more preferably in the range of 20–50 microns. For circular microneedles that do not have sharp edges, a useful length for use with interstitial fluids is in the range of 50–200 microns, and more preferably in the range of 100–150 microns; for use with other biological fluids, a useful length is in the range of 200 microns–3 mm, and more preferably in the range of 200–400 microns. For circular microneedles having sharp side edges, a useful length for use with interstitial fluids is in the range of 50–200 microns, and more preferably in the range of 80–150 microns; for use with other biological fluids, a useful length is again in the range of 200 microns–3 mm, and more preferably in the range of 200–400 microns. For solid microneedles having a star-shaped profile with sharp edges for its star-shaped blades, a useful length for use with interstitial fluids is in the range of 50–200 microns, and more preferably in the range of 80–150 microns; for use with other biological fluids, a useful length is again in the range of 200 microns–3 mm, and more preferably in the range of 200–400 microns, while the radius of each of its blades is in the range of 10–50 microns, and more preferably in the range of 10–15 microns.

    Intracutaneous edged microneedle apparatus
    3.
    发明授权
    Intracutaneous edged microneedle apparatus 有权
    经皮边缘微针装置

    公开(公告)号:US06652478B1

    公开(公告)日:2003-11-25

    申请号:US09580780

    申请日:2000-05-26

    IPC分类号: A61B1720

    摘要: A hollow microneedle with a substantially sharp edge is provided that includes at least one longitudinal blade at the top surface or tip of the microneedle to aid in penetration of the stratum corneum of skin. In a preferred embodiment, there are two such longitudinal blades that are constructed on opposite surfaces at approximately a 180° angle along the cylindrical side wall of the microneedle. Each edged blade has a cross-section that, when viewed from above the microneedle top, has an isosceles triangle profile. The blade's edge can run the entire length of the microneedle from its very top surface to its bottom surface where it is mounted onto the substrate, or the edge can be discontinued partway down the length of the microneedle. A star-shaped solid microneedle also is provided having at least one blade with a relatively sharp edge to assist in penetrating the stratum corneum of skin. In a preferred embodiment, a three pointed star-shape is used, in which each blade has an isosceles triangular cross-section when viewed from the top of the microneedle. The base of each of the isosceles triangles meets at a center of the microneedle to form the star-shaped structure. At least one hole through the substrate is located near the side surfaces of the pairs of blades of the solid microneedle.

    摘要翻译: 提供具有基本锋利边缘的中空微针,其包括在微针的顶表面或尖端处的至少一个纵向刀片,以有助于皮肤角质层的穿透。 在优选实施例中,存在两个这样的纵向叶片,其沿着微针的圆柱形侧壁以大约180°的角度在相对的表面上构造。 每个边缘叶片具有横截面,当从上面观察微针顶部时,其具有等腰三角形轮廓。 刀片的边缘可以将微针的整个长度从其最上表面延伸到其底部表面,在其底部安装到基底上,或者边缘可以在微针的长度上中断。 还提供了星形固体微针,其具有至少一个具有相对锋利边缘的刀片,以有助于穿透皮肤角质层。 在优选实施例中,使用三角星形,其中当从微针的顶部观察时,每个叶片具有等腰三角形横截面。 每个等腰三角形的基部在微针的中心相交,形成星形结构。 穿过基底的至少一个孔位于固体微针的成对叶片的侧表面附近。

    Method of manufacturing microneedle structures using photolithography
    4.
    发明授权
    Method of manufacturing microneedle structures using photolithography 有权
    使用光刻制造微针结构的方法

    公开(公告)号:US07763203B2

    公开(公告)日:2010-07-27

    申请号:US10727124

    申请日:2003-12-03

    IPC分类号: B29C35/08

    摘要: A method for manufacturing microneedle structures is disclosed using soft lithography and photolithography, in which micromold structures made of a photoresist material or PDMS are created. The micromold manufacturing occurs quite quickly, using inexpensive materials and processes. Once the molds are available, using moldable materials such as polymers, microneedle arrays can be molded or embossed in relatively fast procedures. In some cases a sacrificial layer is provided between the forming micromold and its substrate layer, for ease of separation. The microneedles themselves can be solid projections, hollow “microtubes,” or shallow “microcups.” Electrodes can be formed on the microneedle arrays, including individual electrodes per hollow microtube.

    摘要翻译: 公开了使用软光刻和光刻技术制造微针结构的方法,其中制造由光致抗蚀剂材料或PDMS制成的微型结构。 使用廉价的材料和工艺,微型制造相当快速地发生。 一旦模具可用,使用可模塑材料如聚合物,微针阵列可以以相对较快的程序模制或压花。 在一些情况下,为了易于分离,在成形微胶体与其基底层之间提供牺牲层。 微针本身可以是固体突起,中空“微管”或浅“微杯”。电极可以形成在微针阵列上,包括每个中空微管的单个电极。

    Intracutaneous microneedle array apparatus

    公开(公告)号:US07416541B2

    公开(公告)日:2008-08-26

    申请号:US11121291

    申请日:2005-05-03

    摘要: Improved microneedle arrays are provided having a sufficiently large separation distance between each of the individual microneedles to ensure penetration of the skin while having a sufficiently small separation distance to provide high transdermal transport rates. A very useful range of separation distances between microneedles is in the range of 100-300 microns, and more preferably in the range of 100-200 microns. The outer diameter and microneedle length is also very important, and in combination with the separation distance will be crucial as to whether or not the microneedles will actually penetrate the stratum corneum of skin. For circular microneedles, a useful outer diameter range is from 20-100 microns, and more preferably in the range of 20-50 microns. For circular microneedles that do not have sharp edges, a useful length for use with interstitial fluids is in the range of 50-200 microns, and more preferably in the range of 100-150 microns; for use with other biological fluids, a useful length is in the range of 200 microns-3 mm, and more preferably in the range of 200-400 microns. For circular microneedles having sharp side edges, a useful length for use with interstitial fluids is in the range of 50-200 microns, and more preferably in the range of 80-150 microns; for use with other biological fluids, a useful length is again in the range of 200 microns-3 mm, and more preferably in the range of 200-400 microns. For solid microneedles having a star-shaped profile with sharp edges for its star-shaped blades, a useful length for use with interstitial fluids is in the range of 50-200 microns, and more preferably in the range of 80-150 microns; for use with other biological fluids, a useful length is again in the range of 200 microns-3 mm, and more preferably in the range of 200-400 microns, while the radius of each of its blades is in the range of 10-50 microns, and more preferably in the range of 10-15 microns.

    Intracutaneous microneedle array apparatus
    10.
    发明授权
    Intracutaneous microneedle array apparatus 有权
    内皮微针阵列装置

    公开(公告)号:US06379324B1

    公开(公告)日:2002-04-30

    申请号:US09328947

    申请日:1999-06-09

    IPC分类号: A61B1720

    摘要: A first embodiment microneedle array is constructed of silicon and silicon dioxide compounds using MEMS technology and standard microfabrication techniques to create hollow cylindrical individual microneedles. The resulting array of microneedles can penetrate with a small pressure through the stratum corneum of skin to either deliver drugs or to facilitate interstitial fluid sampling through the hollow microneedles into the epidermis. The delivery of drugs and sampling of fluids can be performed by way of passive diffusion (time release), instantaneous injection, or iontophoresis. In a second embodiment, an array of hollow (or solid) microneedles is constructed of plastic or some other type of molded or cast material. An electric field may be used to increase transdermal flow rate, and the microneedles can be effectively combined with the application of an electric field between an anode and cathode attached to the skin which causes a low-level electric current. As a drug delivery system, the microneedle array includes electrodes that apply an electric potential to the skin between the electrode locations. One of the electrode assemblies is filled with an ionized drug, and the charged drug molecules move into the body due to the applied electric potential. As a body-fluid sampling system, the microneedle array also includes electrodes to assist in moving fluid from the body into a receiving chamber, and which further includes a bioelectrochemical sensor to measure the concentration of a particular substance.

    摘要翻译: 第一实施例微针阵列由硅和二氧化硅化合物构成,使用MEMS技术和标准微加工技术来制造中空圆柱形单个微针。 所得的微针阵列可以通过皮肤的角质层穿透小的压力,以递送药物或促进通过空心微针进入表皮的间质液取样。 可以通过被动扩散(时间释放),瞬时注射或离子电渗法进行药物的输送和液体取样。 在第二实施例中,中空(或固体)微针的阵列由塑料或其它类型的模制或铸造材料构成。 可以使用电场来增加透皮流速,并且可以将微针与附着在皮肤上的阳极和阴极之间的电场的施加有效地组合,这导致低电平电流。 作为药物递送系统,微针阵列包括在电极位置之间向皮肤施加电位的电极。 电极组件中的一个填充有电离药物,并且带电药物分子由于施加的电位而进入体内。 作为体液采样系统,微针阵列还包括有助于将流体从身体移动到接收室中的电极,并且还包括用于测量特定物质浓度的生物电化学传感器。