JP2009066087A - 通気構造および通気構造形成方法 - Google Patents
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Abstract
【解決手段】
ルアキャップ1は、通気膜2で被覆する貫通孔11をもった低融点の合成樹脂製であり、通気膜2は、撥水性を有する多孔の第1膜21に低融点の第2膜22を接着した、通気性を有する合成樹脂製の二層膜であり、補助フィルム体3は、低融点の第3膜31に第3膜31より高融点の第4膜32を接着した、通気膜2より外形の大きな合成樹脂製の二層膜であり、通気膜2が補助フィルム体3からはみ出ないように第2膜22と第3膜31とを熱融着して通気膜2が補助フィルム体3に接合されており、第3膜31の外縁部分とルアキャップ1とを熱融着して補助フィルム体3がルアキャップ1に接合されていることを特徴とする通気構造。
【選択図】図2
Description
まず、液体充填の際、キャップや三方活栓の開け閉めは手動で行われるため液漏れが生じる可能性があった。これは、外部の雑菌等の混入の可能性も否定できないため、医療現場では特に慎重にならざるを得ず作業性が劣るという問題点があった。また、液体が高価なものである場合や、厳密な量を供給する場合は、このような密閉開放方式は敬遠されるという問題点があった。
次に、円形の通気膜2と、これより外径は大きく内径は小さなドーナツ型の補助フィルム体3と、ルアキャップ1との接合方法について説明する。製造例1では、通気膜2と、補助フィルム体3と、をルアキャップ1後端に別々に載置した後、熱融着する態様について説明する。なお、以下の例では、工業的生産工程における量産ラインについて必要箇所部分のみ説明する。
次に、円形の通気膜2と、これより外径は大きく内径は小さなドーナツ型の補助フィルム体3と、を予め熱融着したものをルアキャップに載置し、これを熱融着する態様について説明する。なお、以下の例では、工業的生産工程における量産ラインについて必要箇所部分のみ説明する。
次に、通気性と耐水圧性を評価した。実験にはルアキャップを用い、本発明と、市販の三社のものを比較した。
表に示したように、本発明品は、耐水圧が0.20MPa〜0.25MPaであり、A社、B社、C社のいずれよりも一桁以上高い耐水圧性を有することが確認できた。なお、A社製品は、そもそもの固着が不十分であるものも散見され、水圧が低くても膜が剥離寸前の状態となった。B社製品は耐水圧性が低く、すぐフィルタから液が浸潤してきた。A社製品、B社製品、および、C社製品のこの水圧での漏出は、実用的観点からは必ずしも十分とはいえず、医療現場では使用箇所が制限されるのでかえって採用しにくくなる。反対に本発明品の耐水圧性があれば実用的には十分信頼性があるといえ、かつ、剥離も液漏れも見られないため、極めて優れた結果であるといえる。
2 通気膜
3 補助フィルム体
11 貫通孔
21 第1膜
22 第2膜
31 第3膜
32 第4膜
33 打ち抜き孔
Claims (14)
- 医療用管体の経路に接合されるルアキャップその他の筐体に採用される通気構造であって、
通気膜と、通気膜を設ける筐体部分である基体部と、通気膜と基体部の接合を補助する補助フィルム体と、により構成され、
基体部は、通気膜により被覆する貫通孔をもった低融点の合成樹脂製であり、
通気膜は、撥水性を有する多孔の第1膜に低融点の第2膜を接着した、通気性を有する合成樹脂製の二層膜であり、
補助フィルム体は、低融点の第3膜に第3膜より高融点の第4膜を接着した合成樹脂製の二層膜であり、
第3膜の内周部と第2膜とが熱融着して通気膜が補助フィルム体に接合されており、
第3膜の外周部と基体部とが熱融着して補助フィルム体が基体部に接合されていることを特徴とする通気構造。 - 医療用管体の経路に接合されるルアキャップその他の筐体に採用される通気構造であって、
通気膜と、通気膜を設ける筐体部分である基体部と、通気膜と基体部の接合を補助する補助フィルム体と、により構成され、
基体部は、通気膜により被覆する貫通孔をもった低融点の合成樹脂製であり、
通気膜は、撥水性を有する多孔の第1膜に低融点の第2膜を接着した、通気性を有する合成樹脂製の二層膜であり、
補助フィルム体は、低融点の第3膜に第3膜より高融点の第4膜を接着した、通気膜より外形の大きな合成樹脂製の二層膜であり、
通気膜が補助フィルム体からはみ出ないように第2膜と第3膜とを熱融着して通気膜が補助フィルム体に接合されており、
第3膜の外縁部分と基体部とを熱融着して補助フィルム体が基体部に接合されていることを特徴とする通気構造。 - 貫通孔を中心として基体部表面に補助フィルム体外形と略同形の第1の窪みを設け、通気膜外形と略同形の第2の窪みを第1の窪みの中央部に設けたことを特徴とする請求項2に記載の通気構造。
- 通気膜が、多孔性PTFEシートにポリオレフィンの不織布を熱融着させたものであることを特徴とする請求項1、2または3に記載の通気構造。
- 第2膜と第3膜と基体部とをポリオレフィン製としたことを特徴とする請求項1〜4のいずれか一つに記載の通気構造。
- 補助フィルム体を、その中央部に通気膜の外形より小さな形状の孔を打ち抜いて形成したことを特徴とする請求項1〜5のいずれか一つに記載の通気構造。
- 撥水性を有する多孔の第1膜に低融点の第2膜を接着した、通気性を有する合成樹脂製二層膜である通気膜と、通気膜により被覆する貫通孔をあけた筐体部分である低融点の合成樹脂製の基体部と、低融点の第3膜に第3膜より高融点の第4膜を接着した、通気膜と基体部の接合を補助し通気膜より外形の大きな合成樹脂製二層膜である補助フィルム体とにより構成され、
医療用管体の経路に接合されるルアキャップその他の筐体に採用される通気構造の形成方法であって、
貫通孔に通気膜の第1膜側をあてがい、この上に補助フィルム体の第4膜側が上にくるようにかつ通気膜が補助フィルム体からはみ出ないようにあてがい、
筐体外側から加熱手段を押し当てて、第2膜と第3膜とを、および、第3膜と基体部とを熱融着することを特徴とする通気構造形成方法。 - 貫通孔を中心として基体部表面に補助フィルム体外形と略同形の第1の窪みを設けるとともに、通気膜外形と略同形の第2の窪みを第1の窪みの中央部に設けておき、
第2の窪みに通気膜を第1膜側が下にくるように載置し、
第1の窪みに補助フィルム体を第4膜側が上にくるように載置し、
第4膜側から加熱手段を押し当てて、第2膜と第3膜とを、および、第3膜と基体部とを熱融着することを特徴とする請求項7に記載の通気構造形成方法。 - 第3膜と基体部とをはじめに熱融着し、次いで、第2膜と第3膜を熱融着することを特徴とする請求項7または8に記載の通気構造形成方法。
- 撥水性を有する多孔の第1膜に低融点の第2膜を接着した、通気性を有する合成樹脂製二層膜である通気膜と、通気膜により被覆する貫通孔をあけた筐体部分である低融点の合成樹脂製の基体部と、低融点の第3膜に第3膜より高融点の第4膜を接着した、通気膜と基体部の接合を補助し通気膜より外形の大きな合成樹脂製二層膜である補助フィルム体とにより構成され、
医療用管体の経路に接合されるルアキャップその他の筐体に採用される通気構造の形成方法であって、
通気膜の第2膜と補助フィルム体の第3膜を通気膜が補助フィルム体からはみ出ないように接着したものの第1膜側を貫通孔にあてがい、
筐体外側から加熱手段を押し当てて、第3膜と基体部とを熱融着することを特徴とする通気構造形成方法。 - 貫通孔を中心として基体部表面に補助フィルム体外形と略同形の窪みを設けておき、
この窪みに第4膜側が上にくるように載置し、
第4膜側から加熱手段を押し当てて第3膜と基体部とを熱融着することを特徴とする請求項10に記載の通気構造形成方法。 - 前記窪みの中に更に通気膜外形と略同形の第2の窪みを当該第2の窪みの中心に前記貫通孔が位置するように設けておき、
第2の窪みに第1膜側が下にくるように載置し、
第4膜側から加熱手段を押し当てて第3膜と基体部とを熱融着することを特徴とする請求項11に記載の通気構造形成方法。 - 通気膜が、多孔性PTFEシートにポリオレフィンの不織布を熱融着させたものであることを特徴とする請求項7〜12のいずれか一つに記載の通気構造。
- 第2膜と第3膜と基体部とをポリオレフィン製としたことを特徴とする請求項7〜13のいずれか一つに記載の通気構造。
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