JP5738588B2 - 酸素供給シート - Google Patents
酸素供給シート Download PDFInfo
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- JP5738588B2 JP5738588B2 JP2010294306A JP2010294306A JP5738588B2 JP 5738588 B2 JP5738588 B2 JP 5738588B2 JP 2010294306 A JP2010294306 A JP 2010294306A JP 2010294306 A JP2010294306 A JP 2010294306A JP 5738588 B2 JP5738588 B2 JP 5738588B2
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Description
従って、本発明の課題は、優れた酸素供給能を発揮しつつ、より簡略化された構造の酸素供給シートを提供することにある。
酸素透過性であるとともに水難透過性であるフィルム層とを含む積層体からなり、
前記含水ゲル層中の水分量(A)と含水ゲル層の厚み(B)とが、下記式(X)の関係を満たし、かつ
前記フィルム層の厚み(C)と前記含水ゲル層の厚み(B)とが、下記式(Y)の関係を満たす酸素供給シートを提供するものである。
A/expB≧45 ・・・(X)
30−(30×B)≧C ・・・(Y)
(式中、Aは含水ゲル層中の水分量(質量%)、Bは含水ゲル層の厚み(mm)、Cはフィルム層の厚み(μm)を示す)。
A/expB≧45 ・・・(X)
(式中、Aは含水ゲル層中の水分量(質量%)、Bは含水ゲル層の厚み(mm)を示す。)
30−(30×B)≧C ・・・(Y)
(式中、Cはフィルム層の厚み(μm)を示し、Bは上記式(X)中のBと同義である。)
表1〜2に示す成分を混合し、室温で攪拌して均一に溶解させ、各未架橋ゲルを調製した。次いで、表3〜4に示す構成に従って、得られた未架橋ゲルを各種フィルム層と基材(延伸ポリプロピレン70μm;シリコン処理)との間に挟みこみ、所定の厚みになるように伸展させてからアルミピローに入れ、熱シールして閉じた。そして、アルミピローごと50℃恒温槽に入れて1週間加温してゲルを架橋させた後、室温に戻してからアルミピローを開封して中身を取り出し、50mm×50mmの正方形に成形してシートを作製した。次いで、下記に示す方法に従って各シートの酸素浸透速度を測定し、シート貼付後の皮膚の色の変化を目視により評価した。なお、使用直前に基材を剥離除去してからシートを使用した。結果を表3〜4に示す。
図1に示すように、1mm厚;穴径1cmφの金属ワッシャー1を用い、その上面に経皮ガスモニターセンサー2を配置した測定装置を準備した。金属ワッシャーの内側に湿度検知紙の小片、及び塩化カルシウムをティッシュペーパーにくるんだ包体を配置して、金属ワッシャー内における大気中の湿度を20〜30%となるように調製した。なお、測定時、経皮ガスモニターセンサー2の温度は37℃一定になるように調整した。測定は、得られた各シート3の含水ゲル層側を前腕内側の皮膚に1時間貼付した後に、その上面から上記測定装置を配置して行った。測定装置配置後から30分経過時までの金属ワッシャー内の酸素分圧を測定し、その変化率から酸素浸透速度(cm3/cm2/sec)を算出した。
なお、シートを貼付しない皮膚上に直接上記測定装置を配置して酸素浸透速度を算出したところ、2.08×10-7cm3/cm2/secであった。
各シートの含水ゲル層側を前腕内側の皮膚に貼付後、1時間経過した時点でシートを剥離し、剥離した後の皮膚の色の白さをシートを貼付しない皮膚との境界で判別し、下記基準に従って目視により評価した。皮膚の色が白いほど、皮膚に充分な量の酸素が供給されたことを示す。
5:境界がはっきりするほど、シートを剥離した後の皮膚の色が白い。
4:境界がややはっきりする程度に、シートを剥離した後の皮膚の色が白い。
3:境界がわずかに認識できる程度に、シートを剥離した後の皮膚の色が白い。
2:境界がぼんやりして認識できない程度の白さである。
1:シートを剥離した後の皮膚の色がシートを貼付しない皮膚の色と同じであり、境界が認識されなかった。
表5に示す構成に従い、フィルム層の代わりにフィルムラミさせた不織布(ポリエチレンテレフタレート・ポリエチレン複合体;スパンボンド;目付30g/m2)を用いた以外、上記実施例と同様にして、各含水ゲル層の上層に、不織布層を介在させてフィルム層を積層してシートを作製した。次いで、上記と同様にして各シートの酸素浸透速度を測定し、シート貼付後の皮膚の色の変化を目視により評価した。結果を表5に示す。
実施例1のシートを用い、シートを貼付する時間をそれぞれ2時間、5時間、7時間にしたほかは上記の方法と同様にして、酸素浸透速度及び皮膚色の白さを測定した。結果を表6に示す。
2: 経皮ガスモニターセンサー
3: 酸素供給シート
Claims (3)
- 貼付した際に皮膚と接触する面を含み、厚みが0.05〜0.6mmであり、水分量が55〜97質量%である含水ゲル層と、
ポリエチレン及びフッ素樹脂からなる1種又は2種以上から形成され、室温(25℃)における酸素透過係数が、1×10 -13 cm 3 (0℃;1気圧)・cm/cm 2 ・s・Pa以上であり、室温(25℃)における水透過係数が、100×10 -13 cm 3 (0℃;1気圧)・cm/cm 2 ・s・Pa以下であり、かつ厚みが3〜15μmであるフィルム層とを含む積層体からなり、
前記含水ゲル層中の水分量(A)と含水ゲル層の厚み(B)とが、下記式(X)の関係を満たし、かつ
前記フィルム層の厚み(C)と前記含水ゲル層の厚み(B)とが、下記式(Y)の関係を満たす酸素供給シート:
A/expB≧45 ・・・(X)
30−(30×B)≧C ・・・(Y)
(式中、Aは含水ゲル層中の水分量(質量%)、Bは含水ゲル層の厚み(mm)、Cはフィルム層の厚み(μm)を示す)。 - 前記含水ゲル層が、カルボキシメチルセルロース、カルボキシメチルセルロース塩、ポリアクリル酸及びポリアクリル酸塩からなる群より選ばれる少なくとも1種又は2種以上から形成されてなる請求項1に記載の酸素供給シート。
- 前記含水ゲル層が、アニオン界面活性剤を、含水ゲル層の質量に対するアニオン界面活性剤の質量比(アニオン界面活性剤/含水ゲル層)で5.0×10 -6 〜5.0×10 -4 で含有する請求項1又は2に記載の酸素供給シート。
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