JP4143883B2 - Medical device and manufacturing method thereof - Google Patents

Medical device and manufacturing method thereof Download PDF

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JP4143883B2
JP4143883B2 JP19143099A JP19143099A JP4143883B2 JP 4143883 B2 JP4143883 B2 JP 4143883B2 JP 19143099 A JP19143099 A JP 19143099A JP 19143099 A JP19143099 A JP 19143099A JP 4143883 B2 JP4143883 B2 JP 4143883B2
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medical device
coating
base material
maleic anhydride
synthetic resin
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JP2001017536A (en
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健一 天野
素紀 渡邊
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日本シャーウッド株式会社
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Description

【0001】
【発明の属する技術分野】
本発明は、例えばカテーテルなど医療用具の表面において、潤滑性および抗血栓性の被膜を有する医療用具およびその製造方法に関するものである。
【0002】
【従来の技術】
医療用具技術の発展に伴って、その医療用器具自体の用途は多様化しており、特に気道、血管、尿道その他体腔あるいは組織中に挿入するカテーテル、さらにはこれに挿入して使用するガイドワイヤー等の医療用具は、挿入時に粘膜を損傷したり炎症を引き起こしたりすることを避け、また治療を受ける患者の苦痛を軽減するために優れた潤滑性が要求されている。このため、摩擦抵抗を少なくする工夫として用具表面にシリコーンオイル、オリーブオイル、グリセリン等を塗布していたが、その持続性や保存性の点から十分ではなかった。
【0003】
そこで、このような欠点を解決する方法として、例えば用具基材の表面に存在する反応性官能基と無水マレイン酸系高分子物質とを共有結合させ、湿潤時に表面が潤滑性を発現するようにした医療用具が提案されている(特公平1−33181号公報:従来例1)。また、用具基材の表面に存在する反応性官能基と、水溶性高分子物質またはその誘導体とをイオン結合させ、湿潤時に表面が潤滑性を発現するようにしたガイドワイヤーが提案されている(特公平4−12145号公報:従来例2)。
【0004】
【発明が解決しようとする課題】
上記のような従来例1の医療用具は、基材への固定方法として共有結合という化学反応を利用するものであり、その化学反応を起こさせるためには、基材表面に官能基を存在させるためのイソシアネート基、アミノ基、アルデヒド基、エポキシ基等の官能基を有する化合物の溶液での処理を行わなければならず、これによって未反応物が基材表面に残留付着して剥離するおそれがあり、そのために表面潤滑性およびその持続性等において十分な効果が得られないという問題があった。また、従来例2のガイドワイヤーは、従来例1と同様に化学反応を利用するもので、水溶性高分子物質をイオン結合で固定しているので、生理食塩水等のイオンを含有する溶液中では水溶性高分子物質が剥がれてしまい、表面潤滑性を十分持続することができなかった。さらに、従来例1および従来例2の両者は、それぞれの製造方法がきわめて複雑であり、大幅なコストアップにつながるという問題もあった。
【0005】
そこで、このような課題を解決するために、例えばポリウレタンからなる用具基材をメチルビニルエーテル無水マレイン酸共重合体のメチルエチルケトン溶液に浸漬し、乾燥後、水処理することで、その表面に潤滑性被膜を形成し、湿潤時に表面が潤滑性を発現するようにした医療用具が提案されている(特許登録第2804200号公報)。この場合の基材への固定は化学反応を利用していないので、製造方法としては複雑なものではない。しかしながら、例えば使用時において血管への挿抜操作を繰り返し行うと、その繰り返し応力によって表面潤滑性が低下する傾向があり、耐久性の面で問題があった。
【0006】
また、用具基材にポリビニルエーテル無水マレイン酸共重合体またはその部分エステル、シリコーン含有フルオロアクリレート重合体および有機溶媒からなるコーティング剤を塗布した後、アルカリ処理することによって潤滑性表面を有するようにした医療用具が提案されている(特開平7−47120号公報)。この場合も基材への固定は化学反応を使用していないので製造方法は複雑ではないが、従来例1,2と同様に未反応物が残留するおそれがあり、その未反応物によって表面潤滑性およびその持続性等において十分な効果が得られないという問題があった。
【0007】
さらに、無水マレイン酸系高分子物質とポリウレタンの混合物の溶液を合成樹脂からなる基材の表面に塗布して被膜を形成した後に、被膜を加熱処理して不溶化し、さらに親水化剤で処理して親水化し、湿潤時に表面が潤滑性を発現するようにしたガイドワイヤーが提案されている(特開平9−276392号公報)。この場合の基材への固定は化学反応を利用しないので製造方法は複雑ではなく、形成される被膜は摩擦耐久性を有し、表面潤滑性が安定的に維持されるものである。しかしながら、被膜を不溶化させるために120〜140℃の高温で加熱処理を行わなければならないため、処理時の高熱によって変形するカテーテルに対してはこの製造方法を実施することができないという問題があった。
【0008】
本発明は、上記のような課題を解決するためになされたもので、表面潤滑性を有することはもちろんのこと、その潤滑耐久性および抗血栓性を発現できる被膜を有し、かつその被膜を簡単な処理工程で各基材に対して形成することのできる医療用具およびその製造方法を提供することを目的としたものである。
【0009】
【課題を解決するための手段】
本発明に係る医療用具は、合成樹脂からなる医療用具の基材表面に、メチルビニルエーテル無水マレイン酸共重合体とポリエーテルブロックアミドとを有機溶媒に溶解した被覆用混合溶液を塗布して形成したポリマーアロイの被膜を有するものである。
【0010】
本発明に係る医療用具は、基材を構成する合成樹脂を、ポリウレタン、ポリ塩化ビニル、ナイロンまたはナイロンエラストマーとしたものである。
【0011】
本発明に係る医療用具の製造方法は、合成樹脂からなる医療用具の基材表面に、メチルビニルエーテル無水マレイン酸共重合体とポリエーテルブロックアミドとを有機溶媒に溶解した被覆用混合溶液を塗布してポリマーアロイの被膜を形成する方法である。
【0012】
本発明に係る医療用具の製造方法は、合成樹脂からなる医療用具の基材表面に、メチルビニルエーテル無水マレイン酸共重合体とポリエーテルブロックアミドとを有機溶媒に溶解した被覆用混合溶液を塗布した後、室温から80℃の範囲内の乾燥温度で乾燥処理してポリマーアロイの被膜を形成し、さらにアルカリ処理する方法である。
【0013】
【発明の実施の形態】
本発明による医療用具は、合成樹脂からなる基材をメチルビニルエーテル無水マレイン酸共重合体とポリエーテルブロックアミドとを有機溶媒に溶解した被覆用混合溶液に浸漬することにより、基材表面に被膜を形成する。そして、この被膜は、湿潤時における表面潤滑性を有するとともに、温水浸漬および擦過に対する潤滑耐久性を発現し、被膜成分等の溶出を抑えたことによる被膜の密着性と、さらには抗血栓性とを発現する。
【0014】
このような被膜を形成するための被覆用混合溶液および被膜を有する医療用具の製造方法は、以下の通りである。
(1)メチルビニルエーテル無水マレイン酸共重合体とポリエーテルブロックアミドとを、有機溶媒であるテトラヒドロフラン(以下、THFと記す)、アセトンあるいはそれらの混合液に溶解し、被覆用混合溶液を作製する。
(2)ポリウレタン、ポリ塩化ビニル、ナイロンまたはナイロンエラストマーの合成樹脂からなる基材の表面に、浸漬法により、被覆用混合溶液を塗布する。
(3)塗布した基材を室温から80℃の範囲内の乾燥温度で乾燥処理して溶媒を除去し、基材表面にポリエーテルブロックアミド中にメチルビニルエーテル無水マレイン酸を取り込んだポリマーアロイの被膜を形成する。
(4)被膜が形成された基材を例えば水酸化ナトリウム水溶液に浸漬して中和のためのアルカリ処理を行い、水洗いをし、乾燥する。
【0015】
こうして得られた医療用具の被膜の表面潤滑性、潤滑耐久性、密着性および抗血栓性について、以下に実施例を用いて説明する。
【0016】
【実施例】
[実施例1]
メチルビニルエーテル無水マレイン酸共重合体(商品名:Gantrez AN−169、ISP(INTERNATIONAL SPECIALTY PRODUCTS)社製)2%アセトン溶液と、ポリエーテルブロックアミド(商品名:Pebax 2533SA、ATOCHEM社製)2%THF溶液とを1.5:1の割合で混合した被覆用混合溶液を作製し、基材をこの被覆用混合溶液中に浸漬し、引き上げ後乾燥温度80℃で3時間乾燥し、0.1NのNaOH水溶液に3分間浸漬し、引き上げ後水洗いをし、乾燥させて基材表面に被膜を形成した。
なお、基材は、芯材にポリウレタンが被覆された直径が0.035インチ(0.89mm)のガイドワイヤー(ダイメック社製)、または、直径が16Gのポリウレタンからなるチューブとした。
そして、表面に被膜が形成されたガイドワイヤーに対しては次のような表面潤滑性試験を行い、内腔面に被膜が形成されたチューブに対しては次のような抗血栓性試験を行った。そして、それぞれの結果を表1および表2に示す。
【0017】
[表面潤滑性試験]
▲1▼シリコンプレート(厚さ3.15mm)に直径0.6mmの穴を開け、ガイドワイヤーを1分間生理食塩水に浸漬した直後、穴への挿通抵抗(gf)を測定し、被膜の初期潤滑性について調べた。なお、測定値は同種ガイドワイヤーを3個作成しその平均値とした。
▲2▼ガイドワイヤーを50℃の蒸留水に24時間浸漬した後、1分間生理食塩水に浸漬し、その直後▲1▼と同様にシリコンプレートに開けた穴への挿通抵抗(gf)を測定し、被膜の温水浸漬に対する潤滑耐久性について調べた。なお、測定値は同種ガイドワイヤーを3個作成しその平均値とした。
▲3▼96gの分銅の底面(平らに加工した底面)で、ガイドワイヤーの表面を満遍なく擦過し、潤滑性の残存を手感で評価して潤滑性を喪失した往復擦過回数を測定し、被膜の擦過に対する潤滑耐久性について調べた。
▲4▼6cm2 /mlの条件で、ガイドワイヤーを50℃の蒸留水に24時間浸漬して抽出した蒸留水の紫外線吸収を測定し、その最大吸光度から被膜の成分(有機物質)の溶出度および被膜の表面密着性について調べた。
【0018】
【表1】

Figure 0004143883
【0019】
[抗血栓性試験]
▲5▼内腔面に被膜が形成されたチューブの内腔に室温にて人全血を封入し、その後内腔に血栓が形成される時間、クロッティングタイム(h)を測定して、被膜の抗血栓性について調べた。
【0020】
【表2】
Figure 0004143883
【0021】
なお、比較例1乃至4は次の通りである。
[比較例1]
ポリウレタン(商品名:Tecoflex SG80A Thermedics社製)5%THF溶液と、4,4’−ジフェニルメタンジイソシアネート2%メチルエチルケトン(以下、MEKと記す)溶液とを1:1の割合で混合した被覆用混合溶液を作製し、基材をこの被覆用混合溶液中に浸漬し、引き上げ後乾燥温度60℃で1時間乾燥し、その後メチルビニルエーテル無水マレイン酸共重合体(商品名:Gantrez AN−169、ISP社製)2.5%MEK溶液中に1分間浸漬し、引き上げ後60℃で30分間乾燥し、0.1NのNaOH水溶液に3分間浸漬し、引き上げ後水洗いをし、乾燥させて基材表面に被膜を形成した。
【0022】
[比較例2]
基材を4,4’−ジフェニルメタンジイソシアネート5%MEK溶液に浸漬し、引き上げ後乾燥温度60℃で1時間乾燥し、その後ポリビニルピロリドン(商品名:K−90、ISP社製)5%クロロホルム溶液中に浸漬し、引き上げ後乾燥温度60℃で30分間乾燥させて基材表面に被膜を形成した。
【0023】
[比較例3]
基材をメチルビニルエーテル無水マレイン酸共重合体(商品名:Gantrez AN−169、ISP社製)3%MEK溶液中に30秒間浸漬し、引き上げ後乾燥温度60℃で2時間乾燥し、0.1NのNaOH水溶液に3分間浸漬し、引き上げ後水洗いをし、乾燥させて基材表面に被膜を形成した。
【0024】
[比較例4]
メチルビニルエーテル無水マレイン酸共重合体(商品名:Gantrez AN−169、ISP社製)と、ポリウレタン(商品名:Tecoflex SG80A Thermedics社製)とを混合した1.125%MEK溶液(被膜用混合溶液)を作製し、基材をこの被膜用混合溶液中に10秒間浸漬し、引き上げ後乾燥温度80℃で10時間乾燥し、40%メチルアミン水溶液に1時間浸漬し、引き上げ後乾燥させ、基材表面に被膜を形成した。
【0025】
表1からわかるように、試験▲1▼の初期潤滑性については、実施例1および比較例1〜4において数値的にほぼ同じであった。しかしながら、比較例2および比較例3では、手感によって被膜の成分等が溶出していることが明らかにわかり、その溶出物によって表面潤滑性が十分に得られないおそれがあって、実用化にはほど遠いものである。よって、実施例1および比較例1,4が初期潤滑性に優れ実用性の高いものであると言える。
【0026】
また、試験▲2▼の温水浸漬による被膜の耐久性については、実施例1および比較例3が比較例1,2,4よりも数値的に良い結果となった。しかしながら、比較例3では寒天状の物質が多く剥離していることが目視によって明らかであり、この剥離物は溶けたりすることなく残留してしまうため、被膜としては試験▲1▼の比較例3の結果と同様に表面潤滑性およびその耐久性が十分に得られないおそれがあった。よって、実施例1のガイドワイヤーを例えば血管内に挿通して温かい血液に長時間接触した場合でも被膜の表面潤滑性が持続されるとともに、被膜成分が溶出するおそれもないので、実施例1は潤滑耐久性に優れ実用性の高いものであると言える。
【0027】
試験▲3▼の擦過耐久性については、実施例1が比較例1〜4よりも極めて高い結果となった。よって、実施例1のガイドワイヤーを例えば血管内に挿通し、挿抜操作を繰り返し行った、つまり繰り返し応力を与えた場合でも被膜の表面潤滑性が持続されるので、実施例1は擦過耐久性に優れたものであると言える。
【0028】
試験▲4▼の被膜成分の溶出度については、実施例1および比較例4で数値的に低い結果となった。よって、実施例1および比較例4のガイドワイヤーを例えば血管内に挿通して温かい血液に長時間接触した場合でも被膜の成分がほとんど溶出することがないので、実施例1および比較例4は被膜の基材への密着性に優れたものであると言える。
【0029】
また、表2から、試験▲5▼においては実施例1が比較例1〜4よりも高い数値となった。これは、例えば基材(チューブ)の表面に抗血栓性薬剤であるヘパリンをコーティングした場合とほぼ同等レベルの結果であり、実施例1は抗血栓性に優れたものであると言える。
【0030】
以上のことから、実施例1は試験▲1▼〜▲5▼のいずれにおいても良い数値を示しており、実施例1は、その被膜が、初期潤滑性、温水浸漬および擦過に対する潤滑耐久性および非溶出性に優れ、さらに抗血栓性も有するものであると言える。これは、被覆用混合溶液においてポリエーテルブロックアミドを混合したためであり、このポリエーテルブロックアミドによって、表面潤滑の耐久性が発現するとともに、密着性とさらに抗血栓性とを有する被膜が得られる。また、この被膜は上述のような低温加熱処理でかつ簡単な処理工程によって形成することができるとともに、カテーテル等を含む各基材に対しても形成可能な製造方法である。
【0031】
なお、上述の実施例1では基材をポリウレタンで構成した場合を示したが、ポリ塩化ビニル、ナイロンあるいはナイロンエラストマーで構成してもよい。これらの場合も同様の効果を奏する。
【0032】
【発明の効果】
以上のように本発明に係る医療用具は、合成樹脂からなる医療用具の基材表面に、メチルビニルエーテル無水マレイン酸共重合体とポリエーテルブロックアミドとを有機溶媒に溶解した被覆用混合溶液を塗布して形成したポリマーアロイの被膜を有するので、湿潤時に表面潤滑性を発現することができる。また、被膜用混合溶液に含有されたポリエーテルブロックアミドによって、温水浸漬および擦過等に対する表面潤滑の耐久性を発現し、被膜の基材への密着性および被膜成分等が非溶出性を有するので、長期間使用可能でかつ患者に与える苦痛を軽減することができる医療用具を得ることができる。さらに、被膜によって抗血栓性をも有するので、実用性の高い医療用具を得ることができる。
【0033】
本発明に係る医療用具は、基材を構成する合成樹脂を、ポリウレタン、ポリ塩化ビニル、ナイロンまたはナイロンエラストマーとしたので、ポリエーテルブロックアミドとの親和性が得られ、形成された被膜の有する表面潤滑性、潤滑耐久性、密着性および抗血栓性を発現することができる。
【0034】
本発明に係る医療用具の製造方法は、合成樹脂からなる医療用具の基材表面に、メチルビニルエーテル無水マレイン酸共重合体とポリエーテルブロックアミドとを有機溶媒に溶解した被覆用混合溶液を塗布してポリマーアロイの被膜を形成する方法であるので、表面潤滑性、潤滑耐久性、密着性および抗血栓性を有する被膜を簡単な処理工程で形成することができる。
【0035】
本発明に係る医療用具の製造方法は、合成樹脂からなる医療用具の基材表面に、メチルビニルエーテル無水マレイン酸共重合体とポリエーテルブロックアミドとを有機溶媒に溶解した被覆用混合溶液を塗布した後、室温から80℃の範囲内の乾燥温度で乾燥処理してポリマーアロイの被膜を形成し、さらにアルカリ処理する方法であるので、表面潤滑性、潤滑耐久性、密着性および抗血栓性を有する被膜を簡単な処理工程で形成することができるとともに、高温処理では変形してしまうカテーテル等の各医療用具に対しても適用することができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a medical device having a lubricating and antithrombogenic film on the surface of a medical device such as a catheter, and a method for producing the same.
[0002]
[Prior art]
With the development of medical device technology, the use of the medical device itself has been diversified. Especially, the catheter inserted into the respiratory tract, blood vessel, urethra and other body cavities or tissues, and the guide wire to be inserted and used. These medical devices are required to have excellent lubricity in order to avoid damaging the mucous membrane and causing inflammation at the time of insertion and to alleviate the pain of the patient receiving treatment. For this reason, silicone oil, olive oil, glycerin, and the like were applied to the tool surface as a device for reducing frictional resistance, but this was not sufficient in terms of its sustainability and storage stability.
[0003]
Therefore, as a method for solving such a drawback, for example, a reactive functional group present on the surface of the tool base is covalently bonded to a maleic anhydride polymer substance so that the surface exhibits lubricity when wet. A medical device has been proposed (Japanese Patent Publication No. 1-333181: Conventional Example 1). In addition, a guide wire has been proposed in which a reactive functional group present on the surface of a tool substrate is ionically bonded to a water-soluble polymer substance or a derivative thereof so that the surface exhibits lubricity when wet ( Japanese Patent Publication No. 4-12145: Conventional example 2).
[0004]
[Problems to be solved by the invention]
The medical device of Conventional Example 1 as described above uses a chemical reaction called a covalent bond as a fixing method to the base material, and in order to cause the chemical reaction, a functional group is present on the surface of the base material. Treatment with a solution of a compound having a functional group such as isocyanate group, amino group, aldehyde group, epoxy group, etc., which may cause unreacted substances to remain on the substrate surface and peel off. For this reason, there is a problem that sufficient effects cannot be obtained in terms of surface lubricity and sustainability. Further, the guide wire of Conventional Example 2 uses a chemical reaction similarly to Conventional Example 1, and a water-soluble polymer substance is fixed by ionic bonding, so that it is in a solution containing ions such as physiological saline. Then, the water-soluble polymer substance was peeled off, and the surface lubricity could not be maintained sufficiently. Furthermore, both of the conventional example 1 and the conventional example 2 have a problem that their respective manufacturing methods are extremely complicated, leading to a significant cost increase.
[0005]
Therefore, in order to solve such problems, for example, a tool base made of polyurethane is immersed in a methyl ethyl ketone solution of a methyl vinyl ether maleic anhydride copolymer, dried, and then treated with water, whereby a lubricating coating is formed on the surface. A medical device has been proposed in which a surface is developed to exhibit lubricity when wet (Patent Registration No. 2804200). In this case, the fixing to the base material does not use a chemical reaction, so that the manufacturing method is not complicated. However, for example, when the insertion / extraction operation into the blood vessel is repeatedly performed during use, the surface lubricity tends to decrease due to the repeated stress, and there is a problem in terms of durability.
[0006]
In addition, a coating agent comprising a polyvinyl ether maleic anhydride copolymer or a partial ester thereof, a silicone-containing fluoroacrylate polymer, and an organic solvent was applied to the tool base material, and then an alkali treatment was performed to provide a lubricating surface. A medical device has been proposed (Japanese Patent Laid-Open No. 7-47120). In this case as well, since the chemical reaction is not used for fixing to the base material, the manufacturing method is not complicated. There is a problem that sufficient effects cannot be obtained in terms of sex and its sustainability.
[0007]
Furthermore, after a solution of a mixture of maleic anhydride polymer and polyurethane is applied to the surface of a substrate made of synthetic resin to form a film, the film is heat-treated to be insolubilized and further treated with a hydrophilizing agent. There has been proposed a guide wire that is hydrophilized so that the surface exhibits lubricity when wet (Japanese Patent Laid-Open No. 9-276392). In this case, the fixing to the base material does not use a chemical reaction, so the manufacturing method is not complicated, and the formed film has friction durability and the surface lubricity is stably maintained. However, since heat treatment must be performed at a high temperature of 120 to 140 ° C. in order to insolubilize the coating, there is a problem in that this manufacturing method cannot be performed on a catheter that is deformed by high heat during the treatment. .
[0008]
The present invention has been made in order to solve the above-described problems, and has a film capable of exhibiting lubrication durability and antithrombogenicity as well as having surface lubricity, and the film. An object of the present invention is to provide a medical device that can be formed on each base material by a simple treatment process and a method for manufacturing the medical device.
[0009]
[Means for Solving the Problems]
The medical device according to the present invention is formed by applying a coating mixed solution in which methyl vinyl ether maleic anhydride copolymer and polyether block amide are dissolved in an organic solvent on the surface of a base material of a medical device made of a synthetic resin. It has a polymer alloy coating.
[0010]
In the medical device according to the present invention, the synthetic resin constituting the base material is polyurethane, polyvinyl chloride, nylon, or nylon elastomer.
[0011]
In the method for producing a medical device according to the present invention, a coating mixed solution in which methyl vinyl ether maleic anhydride copolymer and polyether block amide are dissolved in an organic solvent is applied to the surface of a base material of a medical device made of a synthetic resin. This is a method for forming a film of polymer alloy .
[0012]
In the method for producing a medical device according to the present invention, a coating mixed solution in which methyl vinyl ether maleic anhydride copolymer and polyether block amide are dissolved in an organic solvent is applied to the surface of a base material of a medical device made of a synthetic resin. Thereafter, the film is dried at a drying temperature in the range of room temperature to 80 ° C. to form a polymer alloy film, and further subjected to alkali treatment.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
In the medical device according to the present invention, a base material made of a synthetic resin is immersed in a coating solution in which methyl vinyl ether maleic anhydride copolymer and polyether block amide are dissolved in an organic solvent, thereby forming a coating on the surface of the base material. Form. And this film has surface lubricity when wet, expresses lubrication durability against warm water soaking and rubbing, adhesion of the film due to suppression of elution of film components, etc. Is expressed.
[0014]
A mixed solution for coating for forming such a coating and a method for producing a medical device having the coating are as follows.
(1) A methyl vinyl ether maleic anhydride copolymer and a polyether block amide are dissolved in tetrahydrofuran (hereinafter referred to as THF) which is an organic solvent, acetone or a mixed solution thereof to prepare a mixed solution for coating.
(2) A coating mixed solution is applied to the surface of a substrate made of a synthetic resin of polyurethane, polyvinyl chloride, nylon or nylon elastomer by a dipping method.
(3) A coating of a polymer alloy in which the coated substrate is dried at a drying temperature in the range of room temperature to 80 ° C. to remove the solvent, and methyl vinyl ether maleic anhydride is incorporated into the polyether block amide on the substrate surface. Form.
(4) The base material on which the film is formed is immersed in, for example, an aqueous sodium hydroxide solution, subjected to alkali treatment for neutralization, washed with water, and dried.
[0015]
The surface lubricity, lubrication durability, adhesion and antithrombogenicity of the coating film of the medical device thus obtained will be described below using examples.
[0016]
【Example】
[Example 1]
Methyl vinyl ether maleic anhydride copolymer (trade name: Gantrez AN-169, ISP (product of INTERNATIONAL SPECIALTY PRODUCTS)) 2% acetone solution and polyether block amide (product name: Pebax 2533SA, manufactured by ATOCHEM) 2% THF A mixed solution for coating was prepared by mixing the solution with the solution at a ratio of 1.5: 1, the substrate was immersed in the mixed solution for coating, and after lifting, dried at a drying temperature of 80 ° C. for 3 hours, It was immersed in an aqueous NaOH solution for 3 minutes, pulled up, washed with water, and dried to form a coating on the substrate surface.
The base material was a 0.035 inch (0.89 mm) guide wire (manufactured by Daimec Co., Ltd.) with a core coated with polyurethane, or a tube made of polyurethane with a diameter of 16G.
Then, the following surface lubricity test is performed on the guide wire with the coating formed on the surface, and the following antithrombogenicity test is performed on the tube with the coating formed on the lumen surface. It was. The results are shown in Tables 1 and 2.
[0017]
[Surface lubricity test]
(1) A 0.6 mm diameter hole was made in a silicon plate (thickness: 3.15 mm), and immediately after the guide wire was immersed in physiological saline for 1 minute, the insertion resistance (gf) into the hole was measured, and the initial coating The lubricity was investigated. In addition, the measurement value made three same kind guide wires, and made it the average value.
(2) Immerse the guide wire in 50 ° C. distilled water for 24 hours, then immerse it in physiological saline for 1 minute, and immediately after that, measure the insertion resistance (gf) into the hole made in the silicon plate as in (1). Then, the durability of the coating against immersion in warm water was examined. In addition, the measurement value made three same kind guide wires, and made it the average value.
(3) At the bottom of the 96 g weight (flat bottom), the surface of the guide wire is rubbed evenly, the remaining lubricity is evaluated by hand, and the number of reciprocating rubs that have lost the lubricity is measured. The durability against lubrication was investigated.
(4) Under the condition of 6 cm 2 / ml, the ultraviolet absorption of distilled water extracted by immersing the guide wire in 50 ° C. distilled water for 24 hours is measured, and the elution degree of the components (organic substances) of the film from the maximum absorbance. And the surface adhesion of the coating was examined.
[0018]
[Table 1]
Figure 0004143883
[0019]
[Anti-thrombogenicity test]
(5) Whole human blood is sealed at room temperature in the lumen of a tube with a coating on the lumen surface, and then the time during which a thrombus is formed in the lumen and the clotting time (h) are measured. Were investigated for antithrombogenicity.
[0020]
[Table 2]
Figure 0004143883
[0021]
Comparative Examples 1 to 4 are as follows.
[Comparative Example 1]
A coating solution in which polyurethane (trade name: manufactured by Tecoflex SG80A Thermedics) 5% THF solution and 4,4′-diphenylmethane diisocyanate 2% methyl ethyl ketone (hereinafter referred to as MEK) solution are mixed at a ratio of 1: 1. The substrate is immersed in this coating mixed solution, pulled up, dried at a drying temperature of 60 ° C. for 1 hour, and then methyl vinyl ether maleic anhydride copolymer (trade name: Gantrez AN-169, manufactured by ISP). Immerse in 2.5% MEK solution for 1 minute, pull up and dry at 60 ° C. for 30 minutes, soak in 0.1N NaOH aqueous solution for 3 minutes, lift and wash with water, dry and coat the substrate surface Formed.
[0022]
[Comparative Example 2]
The substrate was immersed in 4,4′-diphenylmethane diisocyanate 5% MEK solution, pulled up, dried at a drying temperature of 60 ° C. for 1 hour, and then polyvinylpyrrolidone (trade name: K-90, manufactured by ISP) in a 5% chloroform solution. After being pulled up, it was pulled up and dried at a drying temperature of 60 ° C. for 30 minutes to form a coating on the substrate surface.
[0023]
[Comparative Example 3]
The substrate was immersed in a 3% MEK solution of methyl vinyl ether maleic anhydride copolymer (trade name: Gantrez AN-169, manufactured by ISP) for 30 seconds, pulled up, dried at a drying temperature of 60 ° C. for 2 hours, and 0.1 N Was immersed in an aqueous solution of NaOH for 3 minutes, then pulled up, washed with water, and dried to form a coating on the substrate surface.
[0024]
[Comparative Example 4]
1.125% MEK solution (mixture solution for coating) in which methyl vinyl ether maleic anhydride copolymer (trade name: Gantrez AN-169, manufactured by ISP) and polyurethane (trade name: Tecoflex SG80A Thermedics) are mixed. The substrate is dipped in the coating solution for 10 seconds, pulled up, dried at a drying temperature of 80 ° C. for 10 hours, dipped in a 40% methylamine aqueous solution for 1 hour, lifted and dried, and the substrate surface A film was formed.
[0025]
As can be seen from Table 1, the initial lubricity in the test (1) was almost the same numerically in Example 1 and Comparative Examples 1 to 4. However, in Comparative Example 2 and Comparative Example 3, it can be clearly seen that the components of the film are eluted by hand feeling, and there is a possibility that the surface lubricity may not be sufficiently obtained by the eluted material. It is far away. Therefore, it can be said that Example 1 and Comparative Examples 1 and 4 have excellent initial lubricity and high practicality.
[0026]
Moreover, about the durability of the film by the hot water immersion of test (2), Example 1 and Comparative Example 3 were numerically better than Comparative Examples 1, 2, and 4. However, in Comparative Example 3, it is clear by visual observation that a lot of agar-like substances are peeled off, and the peeled material remains without melting, so that the coating is Comparative Example 3 of Test (1). Similar to the results, the surface lubricity and the durability could not be sufficiently obtained. Therefore, even when the guide wire of Example 1 is inserted into, for example, a blood vessel and contacted with warm blood for a long time, the surface lubricity of the coating is maintained and there is no possibility that the coating component is eluted. It can be said that it has excellent lubrication durability and high practicality.
[0027]
As for the scratch durability in Test (3), Example 1 was extremely higher than Comparative Examples 1 to 4. Therefore, the surface lubricity of the coating is maintained even when the guide wire of Example 1 is inserted into, for example, a blood vessel and the insertion / extraction operation is repeatedly performed, that is, when repeated stress is applied. It can be said that it is excellent.
[0028]
About the elution degree of the film | membrane component of test (4), the result was numerically low in Example 1 and Comparative Example 4. Therefore, even when the guide wires of Example 1 and Comparative Example 4 are inserted into a blood vessel, for example, even when they are in contact with warm blood for a long time, the components of the film hardly elute. It can be said that it has excellent adhesion to the substrate.
[0029]
Also, from Table 2, Example 1 was higher than Comparative Examples 1 to 4 in Test (5). This is a result of almost the same level as when the surface of the base material (tube) is coated with heparin, which is an antithrombotic drug, and it can be said that Example 1 is excellent in antithrombogenicity.
[0030]
From the above, Example 1 shows a good numerical value in any of the tests (1) to (5), and Example 1 shows that the coating film has initial lubricity, durability against immersion in hot water and abrasion, and It can be said that it is non-eluting and has antithrombotic properties. This is because the polyether block amide is mixed in the coating mixed solution, and this polyether block amide exhibits the durability of surface lubrication, and provides a film having adhesion and further antithrombogenicity. Further, this coating film can be formed by the low-temperature heat treatment as described above and by a simple treatment process, and is a production method that can be formed on each substrate including a catheter and the like.
[0031]
In the first embodiment, the base material is made of polyurethane. However, it may be made of polyvinyl chloride, nylon or nylon elastomer. These cases also have the same effect.
[0032]
【The invention's effect】
As described above, in the medical device according to the present invention, a coating mixed solution in which methyl vinyl ether maleic anhydride copolymer and polyether block amide are dissolved in an organic solvent is applied to the surface of a base material of a medical device made of a synthetic resin. Since it has a polymer alloy film formed as described above, it can exhibit surface lubricity when wet. In addition, the polyether block amide contained in the mixed solution for coating develops surface lubrication durability against hot water immersion and abrasion, etc., and the adhesion of the coating to the substrate and the coating components are non-eluting. Thus, it is possible to obtain a medical device that can be used for a long period of time and can reduce pain given to a patient. Furthermore, since the coating also has antithrombogenicity, a highly practical medical device can be obtained.
[0033]
In the medical device according to the present invention, since the synthetic resin constituting the base material is polyurethane, polyvinyl chloride, nylon or nylon elastomer, the affinity for the polyether block amide is obtained, and the surface of the formed coating film has It can exhibit lubricity, lubrication durability, adhesion and antithrombotic properties.
[0034]
In the method for producing a medical device according to the present invention, a coating mixed solution in which methyl vinyl ether maleic anhydride copolymer and polyether block amide are dissolved in an organic solvent is applied to the surface of a base material of a medical device made of a synthetic resin. since a method of forming a coating of polymer alloy Te, surface lubricity, lubricity durability, the coating having adhesion and anti-thrombotic can be formed by a simple process.
[0035]
In the method for producing a medical device according to the present invention, a coating mixed solution in which methyl vinyl ether maleic anhydride copolymer and polyether block amide are dissolved in an organic solvent is applied to the surface of a base material of a medical device made of a synthetic resin. Thereafter, it is a method of forming a polymer alloy film by drying at a drying temperature in the range of room temperature to 80 ° C., and further performing an alkali treatment, and thus has surface lubricity, lubrication durability, adhesion and antithrombotic properties. The coating can be formed by a simple treatment process, and can also be applied to each medical device such as a catheter that is deformed by high-temperature treatment.

Claims (4)

合成樹脂からなる医療用具の基材表面に、メチルビニルエーテル無水マレイン酸共重合体とポリエーテルブロックアミドとを有機溶媒に溶解した被覆用混合溶液を塗布して形成したポリマーアロイの被膜を有することを特徴とする医療用具。It has a polymer alloy film formed by applying a coating solution prepared by dissolving methyl vinyl ether maleic anhydride copolymer and polyether block amide in an organic solvent on the surface of a base material of a medical device made of a synthetic resin. A medical device characterized. 基材を構成する合成樹脂を、ポリウレタン、ポリ塩化ビニル、ナイロンまたはナイロンエラストマーとしたことを特徴とする請求項1記載の医療用具。 The medical device according to claim 1 , wherein the synthetic resin constituting the base material is polyurethane, polyvinyl chloride, nylon or nylon elastomer. 合成樹脂からなる医療用具の基材表面に、メチルビニルエーテル無水マレイン酸共重合体とポリエーテルブロックアミドとを有機溶媒に溶解した被覆用混合溶液を塗布してポリマーアロイの被膜を形成することを特徴とする医療用具の製造方法。A polymer alloy film is formed by applying a coating solution prepared by dissolving methyl vinyl ether maleic anhydride copolymer and polyether block amide in an organic solvent on the surface of a medical device made of a synthetic resin. A method for manufacturing a medical device. 合成樹脂からなる医療用具の基材表面に、メチルビニルエーテル無水マレイン酸共重合体とポリエーテルブロックアミドとを有機溶媒に溶解した被覆用混合溶液を塗布した後、室温から80℃の範囲内の乾燥温度で乾燥処理してポリマーアロイの被膜を形成し、さらにアルカリ処理することを特徴とする医療用具の製造方法。After applying a mixed solution for coating in which methyl vinyl ether maleic anhydride copolymer and polyether block amide are dissolved in an organic solvent on the surface of a base material of a medical device made of a synthetic resin, drying within a range of room temperature to 80 ° C. A method for producing a medical device, characterized in that a polymer alloy film is formed by a drying treatment at a temperature, followed by an alkali treatment.
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