JP6477466B2 - 血液フィルター及びその製造方法 - Google Patents
血液フィルター及びその製造方法 Download PDFInfo
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- JP6477466B2 JP6477466B2 JP2015521513A JP2015521513A JP6477466B2 JP 6477466 B2 JP6477466 B2 JP 6477466B2 JP 2015521513 A JP2015521513 A JP 2015521513A JP 2015521513 A JP2015521513 A JP 2015521513A JP 6477466 B2 JP6477466 B2 JP 6477466B2
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/36—Other treatment of blood in a by-pass of the natural circulatory system, e.g. temperature adaptation, irradiation ; Extra-corporeal blood circuits
- A61M1/3621—Extra-corporeal blood circuits
- A61M1/3627—Degassing devices; Buffer reservoirs; Drip chambers; Blood filters
- A61M1/3633—Blood component filters, e.g. leukocyte filters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
- B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
- B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/26—Polyalkenes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/76—Macromolecular material not specifically provided for in a single one of groups B01D71/08 - B01D71/74
- B01D71/82—Macromolecular material not specifically provided for in a single one of groups B01D71/08 - B01D71/74 characterised by the presence of specified groups, e.g. introduced by chemical after-treatment
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F230/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal
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Description
すなわち、本発明は以下のとおりである:
該多孔質素子の表面の少なくとも一部に存在する、下記式(a)で表される有機基を含む繰り返し単位と、下記式(b)で表される有機基を含む繰り返し単位とを含む共重合体:
コーティングされた多孔質素子を−200℃乃至200℃にて乾燥させる工程
を含む、血液フィルターの製造方法;
また、本発明の血液フィルターにより除去あるいは回収される白血球としては、顆粒球、好中球、好塩基球、好酸球、リンパ球、Tリンパ球、ヘルパーTリンパ球、細胞傷害性Tリンパ球、サプレッサーTリンパ球、Bリンパ球、形質細胞、NK細胞、単球、樹状細胞、肥満細胞、単核球、造血前駆細胞、造血幹細胞、骨髄芽球、白血病細胞等が挙げられる。
本発明の第一の態様は、多孔質素子;及び
該多孔質素子の表面の少なくとも一部に存在する、下記式(a)で表される有機基を含む繰り返し単位と、下記式(b)で表される有機基を含む繰り返し単位とを含む共重合体:
本発明の血液フィルターに使用しうる「多孔質素子」は、連続する細孔を持つシート状又は粒状(ビーズ状)の多孔構造体を意味する。そのような多孔構造体は、公知のフィルター材料のいずれの形態であってもよいが、例としては、不織布、織布、編布、繊維塊等の繊維状多孔質体、あるいはスポンジ状多孔質体、多孔膜、粒子の焼結体等の三次元網目状連続細孔を有する非繊維状多孔質体を挙げることができる。取り扱いや入手の容易性、低コストの点から、多孔質素子は、好ましくは、不織布である。
本発明の血液フィルターは、多孔質素子の表面の少なくとも一部が、特定の共重合体でコーティングされていることを特徴とする。本発明に係る共重合体は、下記式(a)で表される有機基を含む繰り返し単位と、下記式(b)で表される有機基を含む繰り返し単位とを含む共重合体:
本発明において「ハロゲン化物イオン」は、ハロゲン原子のアニオンを意味し、フッ化物イオン、塩化物イオン、臭化物イオン、ヨウ化物イオンが挙げられ、好ましくは、塩化物イオンである。
本発明において、「無機酸イオン」とは、炭酸イオン、硫酸イオン、リン酸イオン、リン酸水素イオン、リン酸二水素イオン、硝酸イオン、過塩素酸イオン又はホウ酸イオンを意味する。
上記An−として好ましいのは、ハロゲン化物イオン、硫酸イオン、リン酸イオン、水酸化物イオン及びイソチオシアネートイオンであり、特に好ましいのはハロゲン化物イオンである。
上記共重合体中における第三成分、例えば、上記式(C)又は(D)で表される2官能性モノマーから誘導される架橋構造の割合は、0モル%乃至50モル%である。
本発明に係る共重合体の合成方法としては、一般的なアクリルポリマー又はメタクリルポリマー等の合成方法であるラジカル重合、アニオン重合、カチオン重合などの方法により合成することができる。その形態は溶液重合、懸濁重合、乳化重合、塊状重合など種々の方法が可能である。
本発明の第二の態様は、下記式(a)で表される有機基を含む繰り返し単位と、下記式(b)で表される有機基を含む繰り返し単位とを含む共重合体:
コーティングされた多孔質素子を−200℃乃至200℃にて乾燥させる工程
を含む、血液フィルターの製造方法である。
本発明の血液フィルターの製造方法のコーティング工程では、共重合体を、多孔質素子の表面の少なくとも一部にコーティングする。ここで、多孔質素子及び共重合体は、それぞれ前述の項目<多孔質素子>及び<共重合体>で述べた通りである。
コーティング工程後、コーティングされた多孔質素子を−200℃乃至200℃の温度にて乾燥させる。乾燥により、上記コーティング膜形成用組成物中の溶媒を取り除くと共に、本発明に係る共重合体の式(a)及び式(b)同士がイオン結合を形成して基体へ完全に固着する。本発明の血液フィルターのコーティングの膜厚は、好ましくは10〜1000Åであり、さらに好ましくは10〜500Åである。本発明者らは、本発明の血液フィルターの製造方法では、高温での処理を要さず、低温での処理により、所望の特性を有するコーティングが多孔質素子の表面に形成され、しかも数十乃至数百Å程度の薄い膜厚にも係らず、耐久性に優れることを見出した。
リン含有化合物を含む原料の、各リン含有化合物の濃度(質量%)測定は、31P−NMRにより行った。下記標準物質を用いて原料中に含まれる各リン含有化合物の絶対濃度(絶対質量%)を算出した。
・モード:逆ゲートデカップリングモード(定量モード)
・装置:varian 400 MHz
・溶媒:CD3OD(重メタノール)(30重量%)
・回転数:0 Hz
・データポイント:64000
・フリップ角:90°
・待ち時間:70 s
・積算回数:16回,n=4,
・標準物質:トリメチルリン酸+D2O (75%TMP溶液を調製)
ホスマーM(ユニケミカル(株)製;アシッドホスホオキシエチルメタクリレート(44.2質量%)、リン酸ビス[2−(メタクリロイルオキシ)エチル](28.6質量%)、その他の物質(27.2質量%)の混合物)6.00gとメタクリル酸2−(ジメチルアミノ)エチル4.12g(東京化成(株)製)と2,2′−アゾビス[2−メチル−N−(2−ヒドロキシエチル)プロピオンアミド](製品名;VA−086、和光純薬(株)製)0.24gを、純水446.34gとエタノール49.59gに溶解してナスフラスコに入れ、窒素を吹き込み窒素置換後、100℃のオイルバス中で24時間重合反応させ固形分2質量%の共重合体含有ワニス506.05gを得た。
その後、共重合体含有ワニス1.00gに、純水0.90g、エタノール0.10gを加えて十分に攪拌し、表面処理剤(L)(固形分1質量%)を調製した。
N,N−ジメチルアミノエチルメタクリレート0.6gと2−ヒドロキシエチルメタクリレート15gと2,2′−アゾビス(イソブチロニトリル)0.03gをエタノール62.4gに溶解してナスフラスコに入れ、窒素を吹き込み窒素置換後、68℃のオイルバス中で24時間重合反応させ固形分20質量%の共重合体含有ワニスを得た。
その後、共重合体含有ワニス5.00gに、エタノール95gを加えて十分に攪拌し、表面処理剤(M)(固形分1質量%)を調製した。
以下の各処理工程を表1に記載のとおりに組み合わせて、血液フィルターを調製した。
処理1:UVオゾンクリーナー UV253E(フィルジョン(株)製)にて不織布(下記試験例1〜5参照)を表面処理;
処理2:合成例1で作成した表面処理剤(L)又は比較合成例1にて作成した表面処理剤(M)を、不織布0.1gあたり10g(固形分1質量%)となるよう準備し、該不織布を室温で1日浸漬後、余剰の溶液を除去後、エアブロー;
処理3:40度で1日乾燥;
処理4:エタノール中で1日浸漬;
処理5:水中で1時間浸漬;
処理6:40度で1日乾燥。
表1に示した固定化法(固定化法No.1〜5)による各PET不織布(実施例1〜5:目付38g/m2、厚み0.2mm、繊維径1〜2μm、通気度10cc/cm2/sec、平均孔径約8μm)をφ25mmの大きさに打ち抜き、血液回路に3枚組み込み、血液濾過性能サンプルとした。比較例は未処理(固定化法No.6〜8)のPET不織布(比較例1〜3)を用いた。血液はウサギより脱血した加クエン酸新鮮血を用い、各サンプルにそれぞれ7.5ml濾過した。濾過前及び濾過後の白血球濃度、血小板濃度、赤血球濃度を自動血球計測装置(シスメックス(株)製、XT−2000i)でそれぞれ計測し、以下の式に従い白血球除去率、血小板回収率及び赤血球回収率を求めた。結果を表2に示す。
表1に示した固定化法(固定化法No.3及びNo.5)による各PET不織布(実施例6及び7)をφ25mmの大きさに打ち抜き、血液回路に3枚、5枚、8枚をそれぞれ組み込み、血液濾過性能サンプルとした。血液はウサギより脱血した加クエン酸新鮮血を用い、各サンプルにそれぞれ7.5ml濾過した。濾過前及び濾過後の白血球濃度、血小板濃度、赤血球濃度を自動血球計測装置(シスメックス(株)製、XT−2000i)でそれぞれ計測し、以下の式に従い白血球除去率、血小板回収率及び赤血球回収率を求めた。実際例6の結果を表3に、実施例7の結果を表4に示す。
表1に示した固定化法(固定化法No.3)によるPP不織布(実施例8:目付40g/m2、厚み0.5mm、繊維径1〜2μm、通気度12cc/cm2/sec)及びNylon不織布(実施例9:目付20g/m2、厚み0.2mm、繊維径1〜2μm、通気度12cc/cm2/sec)をφ25mmの大きさに打ち抜き、血液回路にそれぞれ3枚ずつ組み込み、血液濾過性能サンプルとした。比較例は未処理(固定化法No.6)のPP不織布(比較例4)及び未処理(固定化法No.6)のNylon不織布(比較例5)を用いた。血液はウサギより脱血した加クエン酸新鮮血を用い、各サンプルにそれぞれ7.5ml濾過した。濾過前及び濾過後の白血球濃度、血小板濃度、赤血球濃度を自動血球計測装置(シスメックス(株)製、XT−2000i)でそれぞれ計測し、以下の式に従い白血球除去率、血小板回収率及び赤血球回収率を求めた。実施例8及び比較例4のPP不織布の結果を表5に、実施例9及び比較例5のNylon不織布の結果を表6に示す。
表1に示した固定化法(固定化法No.3及び5)によるPET不織布(実施例10及び11)をφ25mmの大きさに打ち抜き、血液回路にそれぞれ3枚ずつ組み込み、血液濾過性能サンプルとした。比較例(固定化法No.6)は未処理のPET不織布(比較例6)を用いた。血液は健常なボランティアより採血した加クエン酸ヒト新鮮血を用い、各サンプルにそれぞれ6.5ml濾過した。濾過前及び濾過後の白血球濃度、血小板濃度、赤血球濃度を自動血球計測装置(シスメックス(株)製、XT−2000i)でそれぞれ計測し、以下の式に従い白血球除去率、血小板回収率及び赤血球回収率を求めた。結果を表7に示す。
表1に示した固定化法(固定化法No.9及び10)により、表面処理剤(M)を固定化したPET製不織布(比較例7及び8:目付38g/m2、厚み0.2mm、繊維径1〜2μm、通気度10cc/cm2/sec、平均孔径約8μm)を作成した。その後、PET製不織布をφ25mmの大きさに打ち抜きフィルターを作成した。血液回路に3枚組み込み、血液濾過性能サンプルとした。比較例は未処理(固定化法No.6)のPET不織布(比較例9)を用いた。血液はウサギより脱血した加クエン酸新鮮血を用い、各サンプルにそれぞれ7.5ml濾過した。濾過前及び濾過後の白血球濃度、血小板濃度、赤血球濃度を自動血球計測装置(シスメックス(株)製、XT−2000i)でそれぞれ計測し、以下の式に従い白血球除去率、血小板回収率及び赤血球回収率を求めた。結果を表8に示す。
Claims (12)
- 多孔質素子;及び
該多孔質素子の表面の少なくとも一部に存在する、下記式(a)で表される有機基を含む繰り返し単位と、下記式(b)で表される有機基を含む繰り返し単位とを含む共重合体:
式中、
Ua1、Ua2、Ub1、Ub2及びUb3は、それぞれ独立して、水素原子又は炭素原子数1乃至5の直鎖若しくは分岐アルキル基を表し、そしてAn−は、ハロゲン化物イオン、無機酸イオン、水酸化物イオン及びイソチオシアネートイオンからなる群から選ばれる陰イオンを表す
を含む、生体物質の付着抑制能を有する白血球除去フィルター。 - 上記式(a)及び(b)で表される有機基を含む繰り返し単位が、それぞれ、下記式(A)及び(B):
式中、
Ta、Tb、Ua1、Ua2、Ub1、Ub2及びUb3は、それぞれ独立して、水素原子又は炭素原子数1乃至5の直鎖若しくは分岐アルキル基を表し、Qa及びQbは、それぞれ独立して、単結合、エステル結合又はアミド結合を表し、Ra及びRbは、それぞれ独立して、ハロゲン原子で置換されていてもよい炭素原子数1乃至10の直鎖又は分岐アルキレン基を表し、An−は、ハロゲン化物イオン、無機酸イオン、水酸化物イオン及びイソチオシアネートイオンからなる群から選ばれる陰イオンを表し、そしてmは、0乃至6の整数を表す
で表されるモノマーから誘導される繰り返し単位である、請求項1に記載の白血球除去フィルター。 - mが1であり、Ra及びRbが、それぞれ独立して、エチレン基又はプロピレン基を表す、請求項2に記載の白血球除去フィルター。
- 上記共重合体が、さらに下記式(C)又は(D):
式中、
Tc、Td及びUdは、それぞれ独立して、水素原子又は炭素原子数1乃至5の直鎖若しくは分岐アルキル基を表し、Rc及びRdは、それぞれ独立して、ハロゲン原子で置換されていてもよい炭素原子数1乃至10の直鎖又は分岐アルキレン基を表す
で表されるモノマーから誘導される架橋構造を含む、請求項1乃至3何れかに記載の白血球除去フィルター。 - Tc及びTdが、それぞれ独立して、水素原子又はメチル基を表し、Udが、水素原子を表し、Rc及びRdが、それぞれ独立して、エチレン基又はプロピレン基を表す、請求項4に記載の白血球除去フィルター。
- 上記多孔質素子が、不織布である、請求項1乃至5何れか1項に記載の白血球除去フィルター。
- 下記式(a)で表される有機基を含む繰り返し単位と、下記式(b)で表される有機基を含む繰り返し単位とを含む共重合体:
式中、
Ua1、Ua2、Ub1、Ub2及びUb3は、それぞれ独立して、水素原子又は炭素原子数1乃至5の直鎖若しくは分岐アルキル基を表し、そしてAn−は、ハロゲン化物イオン、無機酸イオン、水酸化物イオン及びイソチオシアネートイオンからなる群から選ばれる陰イオンを表す
を、多孔質素子の表面の少なくとも一部にコーティングする工程;及び
コーティングされた多孔質素子を−200℃乃至200℃にて乾燥させる工程
を含む、血液フィルターの製造方法。 - 上記式(a)及び(b)で表される有機基を含む繰り返し単位が、それぞれ、下記式(A)及び(B):
式中、
Ta、Tb、Ua1、Ua2、Ub1、Ub2及びUb3は、それぞれ独立して、水素原子又は炭素原子数1乃至5の直鎖若しくは分岐アルキル基を表し、Qa及びQbは、それぞれ独立して、単結合、エステル結合又はアミド結合を表し、Ra及びRbは、それぞれ独立して、ハロゲン原子で置換されていてもよい炭素原子数1乃至10の直鎖又は分岐アルキレン基を表し、An−は、ハロゲン化物イオン、無機酸イオン、水酸化物イオン及びイソチオシアネートイオンからなる群から選ばれる陰イオンを表し、そしてmは0乃至6の整数を表す
で表されるモノマーから誘導される繰り返し単位である、請求項7に記載の製造方法。 - コーティング工程が、共重合体を含むワニスを用いて実施される、請求項7又は8に記載の製造方法。
- 共重合体を含むワニスが、予めpH調整されている、請求項9に記載の製造方法。
- さらに、コーティングされた多孔質素子を、乾燥工程前及び/又は後に、洗浄する工程を含む、請求項7乃至10何れか1項に記載の製造方法。
- 乾燥工程後の洗浄が、水及び電解質を含む水溶液からなる群より選ばれる少なくとも1種の溶媒を用いて実施される、請求項11に記載の製造方法。
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