JP2016179157A - マイクロニードルおよびその製造 - Google Patents
マイクロニードルおよびその製造 Download PDFInfo
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- JP2016179157A JP2016179157A JP2015080388A JP2015080388A JP2016179157A JP 2016179157 A JP2016179157 A JP 2016179157A JP 2015080388 A JP2015080388 A JP 2015080388A JP 2015080388 A JP2015080388 A JP 2015080388A JP 2016179157 A JP2016179157 A JP 2016179157A
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- Prior art keywords
- microneedle
- polyglycolic acid
- crystallinity
- microneedle array
- injection molding
- Prior art date
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
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Abstract
Description
本発明の特徴は射出圧1000〜1500KPaと、金型温度を60〜130℃とすることであり、このような条件で射出し成形することにより結晶化が進行し、経時変化のない優れた物性のマイクロニードルが得られる。
基板の凸部は約0.2〜10mmが好ましく凹部は0.2mm以上が好ましいが基板の凹部の深さは最大で基盤の厚さと同等な深さまで可能である。基板凹部の全基板面積に対する割合は10%〜90%が適当である。凹部割合が10%以下であると凹凸を有するメリットが少ない。また90%以上であると基板が全体として薄くなりマイクロニードルアレイの機械的強度を弱化させる恐れが生じる。
ここに薬物とは、皮膚に働きかけ、あるいは皮膚を透過し、何らかの有益な作用を生じる化合物をいう。本発明の目的に適した薬物の例としては、例えば、生理活性ペプチド類とその誘導体、核酸、オリゴヌクレオチド、各種の抗原蛋白質、バクテリア、ウイルスの断片等が挙げられる。
薬物の溶液はマイクロニードルの先端部から500μm程度の範囲に塗布することが好ましい。
典型的な2段構造のマイクロニードルアレイの断面図を模式的に図1に示す。マイクロニードルは先端部11と基底部12とを有する。基板14は基板台部13を有し、凹凸を設けている。
以下の実施例及び比較例では、ポリグリコール酸(高純度Kuredux:(株)クレハ製)を用いた。
金型を射出成形機(ファナック(株))に取付け、ポリグリコール酸を溶融して射出成形を行なった。シリンダー温度235℃、射出圧力1350KPa、金型温度120℃、で射出成形し図1に示すような断面形状の乳白色のマイクロニードルアレイを取り出した。得られたマイクロニードルアレイのマイクロニードル部分の顕微鏡写真を図2に、このマイクロニードルアレイの表面及び裏面の写真を図3に示す。アレイにあるマイクロニードルの総数は458本であり、円錐台状の形状を示した。このマイクロニードルアレイを実施例1とする。
なお、基底部高さと先端部高さの合計がマイクロニードルの針高さである。
金型温度を40‐50℃とし、実施例1とほぼ同様の条件でマイクロニードルアレイを射出成形した。得られたマイクロニードルの顕微鏡写真を図4に示す。得られたマイクロニードルの先端部頂点直径は約0.038mmであり、先端部高さが約0.25mmの円錐台状のマイクロニードルを持つほぼ透明なマイクロニードルアレイが作製できた。このマイクロニードルアレイを比較例1とする。
ポリグリコール酸製マイクロニードルアレイを1,2−ジクロロエタンに入れると底に沈む。1,2−ジクロロエタンに四塩化炭素を加えて混合すると、やがてマイクロニードルアレイは浮上する。マイクロニードルアレイが浮上も沈殿もしない状態の1,2−ジクロロエタンと四塩化炭素の混合液の密度を7本組比重計((株)相互理化学硝子製作所)で求め、その密度をマイクロニードルアレイの密度とした。
X=(1/ρa−1/ρ)/(1/ρa−1/ρc)×100
式中、ρaは結晶化度0%のポリグリコール酸の密度(=1.500g/cm3)を、ρcは結晶化度100%のポリグリコール酸の密度(=1.700g/cm3)を表す。
実施例1及び比較例1のマイクロニードルアレイを、60℃で24時間放置した後の写真を図5、図6に示す。また、それらの密度及び結晶化度を表1に示す。結晶化度が低い比較例1のものは、放置により結晶化が進み密度が上昇し、それに伴い異常変形していることがわかる。
マイクロニードルは皮膚に刺入できるに十分な強度を有しなければならない。圧縮強度が大きいものは容易に皮膚に刺入できると考えられるので、マイクロニードルの圧縮強度を小型卓上試験機((株)島津製作所、EZ Test)により測定した。試料を2枚のステンレスの板ではさみ1.0mm/minの速度で圧縮し、降伏点応力を求めた。マイクロニードル1本あたりの降伏点応力を圧縮強度とした(圧縮強度=降伏点応力/針本数)。結果を図7に示す。ここに20は実施例1、21は比較例1のマイクロニードルアレイの結果である。実施例1においては圧縮強度0.07Nを示したのに反し比較例においては明瞭な降伏点を示さない。
以上のように、ポリグリコール酸マイクロニードルの結晶化はマイククロニードル物性に重大な影響を及ぼすことを確認した。結晶化の度合いを最も鋭敏に反映し容易に測定できるのは、マイクロニードルアレイを60℃で24時間加熱後の針高さの変化を測定することである。種々の条件下で作成したマイクロニードルアレイの先端部針高さ(A)と60℃24時間加熱後の針高さ(B)の比(B/A)を収縮率(%)として表2にまとめた。実施例8と比較例4のマイクロニードルアレイは、2段型ではなく1段型であるが、製造条件と収縮率に関しては2段型も1段型も大きな差異がなかった。
Claims (8)
- ポリグリコール酸を素材とし
マイクロニードルの結晶化度が20%以上であるマイクロニードルアレイ。 - 収縮率が90%以上であることを特徴とする請求項1に記載のマイクロニードルアレイ。
- マイクロニードルの形状が円錐形もしくは円錐台形もしくはコニーデ型であり、マイクロニードルは1段構造若しくは2段構造をとっており、マイクロニードルの針高さは0.1mmから1.5mmであり、マイクロニードル間の間隙は0.2mmから1.5mmであることを特徴とする請求項1又は2に記載のマイクロニードルアレイ。
- 基板の上部に基板台部を有し、及び/又は基板の下部に凹凸を有することを特徴とする請求項1から3のいずれか1項に記載のマイクロニードルアレイ。
- 基板下部の凹部の深さは0.2mm以上であり、凹部が全基板面積の10%ないし90%を占めることを特徴とする請求項1から4のいずれか1項に記載のマイクロニードルアレイ。
- マイクロニードルの先端部に薬物を保持させたことを特徴とする請求項1から5のいずれか1項に記載のマイクロニードルアレイ。
- ポリグリコール酸を、シリンダー温度230〜280℃、金型温度60〜130℃、射出圧1000〜1500KPaで射出成形することによって、ポリグリコール酸の結晶化度が20%以上であり、マイクロニードル1本あたりの圧縮強度が0.05N以上であるマイクロニードルアレイを製造する製造方法。
- 結晶化度が20%以上であるポリグリコール酸を素材とするマイクロニードルアレイの先端から500μmの間に薬物を保持させた経皮吸収製剤。
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JP2015080388A JP5852280B1 (ja) | 2015-03-23 | 2015-03-23 | マイクロニードルおよびその製造 |
EP15886513.9A EP3275500B1 (en) | 2015-03-23 | 2015-12-10 | Microneedle and method for producing same |
MYPI2017703471A MY186380A (en) | 2015-03-23 | 2015-12-10 | Microneedle and method for producing same |
US15/560,142 US10589006B2 (en) | 2015-03-23 | 2015-12-10 | Microneedle and method for producing same |
KR1020177025303A KR102426383B1 (ko) | 2015-03-23 | 2015-12-10 | 마이크로니들 및 그의 제조 방법 |
CN201580078126.3A CN107427671B (zh) | 2015-03-23 | 2015-12-10 | 一种微针及其制造方法 |
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CN202110456568.4A CN113171551B (zh) | 2015-03-23 | 2015-12-10 | 一种微针及其制造方法 |
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