JP2022525619A - 高分子量ポリエチレンから製造される射出成形医療デバイス - Google Patents
高分子量ポリエチレンから製造される射出成形医療デバイス Download PDFInfo
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Abstract
Description
[00017]本議論は、例示的な実施形態の説明にすぎず、本発明のより広い態様を限定するものとしては意図されないことが当業者に理解される。
[00022]別の実施形態においては、ポリエチレンはコポリマーであってもよい。例えば、ポリエチレンは、エチレンと、3~16個の炭素原子、例えば3~10個の炭素原子、例えば3~8個の炭素原子を含む他のオレフィンとのコポリマーであってよい。これらの他のオレフィンとしては、プロピレン、1-ブテン、1-ペンテン、1-ヘキセン、1-ヘプテン、1-オクテン、4-メチルペント-1-エン、1-デセン、1-ドデセン、1-ヘキサデセンなどが挙げられるが、これらに限定されない。また、1,3-ヘキサジエン、1,4-ヘキサジエン、シクロペンタジエン、ジシクロペンタジエン、4-ビニルシクロヘキス-1-エン、1,5-シクロオクタジエン、5-ビニリデン-2-ノルボルネン、及び5-ビニル-2-ノルボルネンのようなポリエンコモノマーも、本発明において利用可能である。しかしながら、存在する場合、コポリマー中の1種類又は複数の非エチレン性モノマーの量は、約10モル%未満、例えば約5モル%未満、例えば約2.5モル%未満、例えば約1モル%未満であり得、ここでモル%はポリマー中のモノマーの総モル数に基づく。
[00033]かかる触媒系を使用すると、重合は、通常は、懸濁液中で、低圧及び低温において、連続又はバッチの1つ又は複数の工程で行う。重合温度は、通常は30℃~130℃の範囲、好ましくは50℃~90℃の範囲であり、エチレン分圧は、通常は10MPa未満、好ましくは0.05~5MPaである。Al:Ti(助触媒:触媒)の比が0.01~100:1の範囲、より好ましくは0.03~50:1の範囲であるような、例えばイソプレニルアルミニウム及びトリイソブチルアルミニウムなど(しかしながらこれらに限定されない)のトリアルキルアルミニウムが助触媒として使用される。溶媒は、チーグラータイプの重合のために通常使用される不活性有機溶媒である。例は、ブタン、ペンタン、ヘキサン、シクロヘキセン、オクタン、ノナン、デカン、それらの異性体、及びそれらの混合物である。ポリマーの分子量は、水素を供給することによって制御される。水素分圧とエチレン分圧との比は、0~50の範囲、好ましくは0~10の範囲である。ポリマーを単離し、窒素下において流動床乾燥機中で乾燥させる。溶媒は、高沸点溶媒を使用する場合には水蒸気蒸留によって除去することができる。長鎖脂肪酸の塩を安定剤として加えることができる。代表例は、ステアリン酸カルシウム、ステアリン酸マグネシウム、及びステアリン酸亜鉛である。
[00061]本発明にしたがって高分子量ポリエチレンポリマーを配合する。高分子量ポリエチレンポリマーは、190℃及び21.6kgの荷重において試験した場合に1.1g/10分のメルトフローレートを有していた。ポリエチレンポリマーは500mL/gの粘度数を有していた。
[00063]射出成形中、全ショット重量は25グラムであった。射出成形装置は、ゾーン1が52℃、ゾーン2が188℃、ゾーン3が238℃、ゾーン4が274℃、ノズルが260℃になるように運転した。金型温度は70℃であった。射出速度は25mm/秒であり、射出圧力は686バールであった。
Claims (20)
- 射出成形ポリマー物品を含む医療デバイスであって、前記ポリマー物品は高分子量ポリエチレンポリマーを含み、前記高分子量ポリエチレンポリマーは、190℃及び21.6kgの荷重においてISO試験1133によって測定して約0.8g/10分より高く、約3g/10分未満のメルトフローインデックスを有し、前記高分子量ポリエチレンは、ISO試験1628-3にしたがって試験した場合に約400cm3/gより大きい粘度数を有する上記医療デバイス。
- 前記高分子量ポリエチレンポリマーが、約0.9g/10分~約2.0g/10分のメルトフローインデックスを有する、請求項1に記載の医療デバイス。
- 前記高分子量ポリエチレンポリマーが、約450cm3/gより大きく、約900cm3/g未満の粘度数を有する、請求項1~2のいずれかに記載の医療デバイス。
- 前記高分子量ポリエチレンポリマーが、ASTM試験D4020にしたがって約300,000g/モルより高い分子量を有する、請求項1~3のいずれかに記載の医療デバイス。
- 前記高分子量ポリエチレンポリマーが、ASTM試験D4020にしたがって約350,000g/モル~約5,000,000g/モルの分子量を有する、請求項4に記載の医療デバイス。
- 前記高分子量ポリエチレンポリマーが、ISO試験1183-1、方法Aにしたがって試験した場合に、約0.93g/cm3~約0.97g/cm3の比重を有する、請求項1~5のいずれかに記載の医療デバイス。
- 前記高分子量ポリエチレンポリマーが、ISO試験10993の試験要件の少なくとも幾つかを満足する、請求項1~6のいずれかに記載の医療デバイス。
- 前記高分子量ポリエチレンポリマーが、全身毒性についてISO試験10993-11に合格し、皮内反応性についてISO試験10993-10に合格し、2週間筋肉移植についてISO試験10993-6に合格し、細胞毒性についてISO試験10993-5に合格し、遺伝毒性についてISO試験10993-3に合格し、溶血性についてISO試験10993-4に合格し、そして物理化学的性質についてUSP試験661に合格する、請求項7に記載の医療デバイス。
- 前記射出成形ポリマー物品が、約70重量%より多い量の前記高分子量ポリエチレンポリマーを含む、請求項1~8のいずれかに記載の医療デバイス。
- 前記射出成形ポリマー物品が、約90重量%より多い量の前記高分子量ポリエチレンポリマーを含む、請求項1~9のいずれかに記載の医療デバイス。
- 前記高分子量ポリエチレンポリマーが、エチレンと、プロピレン、ブチレン、又はそれらの混合物を含む少なくとも1種類のモノマーとのコポリマーを含む、請求項1~10のいずれかに記載の医療デバイス。
- 前記成形ポリマー物品が活性医薬成分を更に含む、請求項1~11のいずれかに記載の医療デバイス。
- 前記ポリマー物品が造影剤を更に含む、請求項1~12のいずれかに記載の医療デバイス。
- 前記ポリマー物品が人工器官を含む、請求項1~13のいずれかに記載の医療デバイス。
- 前記ポリマー物品がインプラントを含む、請求項1~13のいずれかに記載の医療デバイス。
- 前記ポリマー物品が管状の形状を有する、請求項1~13のいずれかに記載の医療デバイス。
- 前記ポリマー物品が、チップ、RFIDタグ、手術器具、神経刺激装置、又はポンプ中に組み込まれている、請求項1~13のいずれかに記載の医療デバイス。
- 前記ポリマー物品が、栄養チューブ、カテーテル、拡張可能なバルーン、ステント、心臓弁、人工内耳、頭蓋-顎顔面インプラント、合成軟骨、胃リング、血管クランプ、動脈瘤クリップ、脊椎プラグ、人工関節用のベースプレートステムキャップ、筋肉インプラント、鼻咽頭インプラント、喉頭インプラント、口腔粘膜インサート、子宮内避妊用具、膣内リング、又は歯科用繊維を含む、請求項1~13のいずれかに記載の医療デバイス。
- 前記ポリマー物品が、薬物送達デバイス、経皮パッチ、又は皮下インプラントを含む、請求項1~13のいずれかに記載の医療デバイス。
- 請求項1~13のいずれかに記載の医療デバイスを患者に移植すること;
を含む方法。
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US4164531A (en) | 1975-01-13 | 1979-08-14 | Mitsui Petrochemical Industries, Ltd. | Injection molding of ultra high molecular weight polyethylene |
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