JP4135905B2 - Eye drops for contact lenses containing a cooling agent - Google Patents
Eye drops for contact lenses containing a cooling agent Download PDFInfo
- Publication number
- JP4135905B2 JP4135905B2 JP2003071181A JP2003071181A JP4135905B2 JP 4135905 B2 JP4135905 B2 JP 4135905B2 JP 2003071181 A JP2003071181 A JP 2003071181A JP 2003071181 A JP2003071181 A JP 2003071181A JP 4135905 B2 JP4135905 B2 JP 4135905B2
- Authority
- JP
- Japan
- Prior art keywords
- menthol
- oxygen
- poe
- contact lenses
- surfactant
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000003889 eye drop Substances 0.000 title claims description 54
- 229940012356 eye drops Drugs 0.000 title claims description 25
- 239000002826 coolant Substances 0.000 title claims description 10
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- 239000004094 surface-active agent Substances 0.000 claims description 19
- NOOLISFMXDJSKH-UHFFFAOYSA-N DL-menthol Natural products CC(C)C1CCC(C)CC1O NOOLISFMXDJSKH-UHFFFAOYSA-N 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 15
- 239000003795 chemical substances by application Substances 0.000 claims description 13
- 229940041616 menthol Drugs 0.000 claims description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 12
- 229910052760 oxygen Inorganic materials 0.000 claims description 12
- 239000001301 oxygen Substances 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 9
- DSSYKIVIOFKYAU-XCBNKYQSSA-N (R)-camphor Chemical compound C1C[C@@]2(C)C(=O)C[C@@H]1C2(C)C DSSYKIVIOFKYAU-XCBNKYQSSA-N 0.000 claims description 8
- 229920001400 block copolymer Polymers 0.000 claims description 6
- JNYAEWCLZODPBN-JGWLITMVSA-N (2r,3r,4s)-2-[(1r)-1,2-dihydroxyethyl]oxolane-3,4-diol Chemical compound OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O JNYAEWCLZODPBN-JGWLITMVSA-N 0.000 claims description 5
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- NFLGAXVYCFJBMK-UHFFFAOYSA-N isomenthone Natural products CC(C)C1CCC(C)CC1=O NFLGAXVYCFJBMK-UHFFFAOYSA-N 0.000 claims description 2
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- 229940054534 ophthalmic solution Drugs 0.000 claims 7
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- 238000004519 manufacturing process Methods 0.000 claims 2
- ZORQXIQZAOLNGE-UHFFFAOYSA-N 1,1-difluorocyclohexane Chemical compound FC1(F)CCCCC1 ZORQXIQZAOLNGE-UHFFFAOYSA-N 0.000 claims 1
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- 230000000694 effects Effects 0.000 description 11
- 238000012360 testing method Methods 0.000 description 11
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- 230000000052 comparative effect Effects 0.000 description 7
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- TZBAVQKIEKDGFH-UHFFFAOYSA-N n-[2-(diethylamino)ethyl]-1-benzothiophene-2-carboxamide;hydrochloride Chemical compound [Cl-].C1=CC=C2SC(C(=O)NCC[NH+](CC)CC)=CC2=C1 TZBAVQKIEKDGFH-UHFFFAOYSA-N 0.000 description 1
- MGFYIUFZLHCRTH-UHFFFAOYSA-N nitrilotriacetic acid Chemical compound OC(=O)CN(CC(O)=O)CC(O)=O MGFYIUFZLHCRTH-UHFFFAOYSA-N 0.000 description 1
- GSGDTSDELPUTKU-UHFFFAOYSA-N nonoxybenzene Chemical compound CCCCCCCCCOC1=CC=CC=C1 GSGDTSDELPUTKU-UHFFFAOYSA-N 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 235000019477 peppermint oil Nutrition 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 239000008363 phosphate buffer Substances 0.000 description 1
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 1
- 239000004302 potassium sorbate Substances 0.000 description 1
- 235000010241 potassium sorbate Nutrition 0.000 description 1
- 229940069338 potassium sorbate Drugs 0.000 description 1
- 235000010409 propane-1,2-diol alginate Nutrition 0.000 description 1
- 239000000770 propane-1,2-diol alginate Substances 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 235000013772 propylene glycol Nutrition 0.000 description 1
- HNJBEVLQSNELDL-UHFFFAOYSA-N pyrrolidin-2-one Chemical compound O=C1CCCN1 HNJBEVLQSNELDL-UHFFFAOYSA-N 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 239000010666 rose oil Substances 0.000 description 1
- 235000019719 rose oil Nutrition 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 235000010413 sodium alginate Nutrition 0.000 description 1
- 239000000661 sodium alginate Substances 0.000 description 1
- 229940005550 sodium alginate Drugs 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 description 1
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 1
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 1
- 235000019333 sodium laurylsulphate Nutrition 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- RUTSRVMUIGMTHJ-UHFFFAOYSA-M sodium;tetradec-1-ene-1-sulfonate Chemical compound [Na+].CCCCCCCCCCCCC=CS([O-])(=O)=O RUTSRVMUIGMTHJ-UHFFFAOYSA-M 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 235000010199 sorbic acid Nutrition 0.000 description 1
- 239000004334 sorbic acid Substances 0.000 description 1
- 229940075582 sorbic acid Drugs 0.000 description 1
- 229960002920 sorbitol Drugs 0.000 description 1
- 230000009469 supplementation Effects 0.000 description 1
- 208000024891 symptom Diseases 0.000 description 1
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 1
- UEUXEKPTXMALOB-UHFFFAOYSA-J tetrasodium;2-[2-[bis(carboxylatomethyl)amino]ethyl-(carboxylatomethyl)amino]acetate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]C(=O)CN(CC([O-])=O)CCN(CC([O-])=O)CC([O-])=O UEUXEKPTXMALOB-UHFFFAOYSA-J 0.000 description 1
- 239000012929 tonicity agent Substances 0.000 description 1
- 235000010487 tragacanth Nutrition 0.000 description 1
- 239000000196 tragacanth Substances 0.000 description 1
- 229940116362 tragacanth Drugs 0.000 description 1
- 229960005066 trisodium edetate Drugs 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 229940088594 vitamin Drugs 0.000 description 1
- 239000011782 vitamin Substances 0.000 description 1
- 229930003231 vitamin Natural products 0.000 description 1
- 235000013343 vitamin Nutrition 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Landscapes
- Eyeglasses (AREA)
- Medicinal Preparation (AREA)
- Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
Description
【0001】
【発明の属する技術分野】
本発明は、清涼化剤を含有するコンタクトレンズ用点眼剤に関し、更に詳しくは、コンタクトレンズ装用時に点眼することができる点眼剤に関する。
【0002】
【従来の技術】
コンタクトレンズ装用時の不快感を解消するために、様々な人工涙液型点眼剤が市販されているが、これらの多くは、無機塩類や金属キレート剤を含んでいることから、涙液の減少に伴う目の乾燥感の解消には有用であっても、コンタクトレンズ装用者がしばしば訴える装用時の異物感や痒みなどの不快感を解消する効果はない。
コンタクトレンズは、薬物特に有機化合物を非常に吸着しやすく、レンズに蓄積しやすい性質をもち、また、コンタクトレンズに適用される用剤のpHや浸透圧により、レンズの物理的パラメーターが著しく影響を受けることが知られている。このような特殊性から、コンタクトレンズ装用時に適用しうる点眼剤には、通常、無機塩類のみが配合されている。しかし、そのような点眼剤では、既述のごとく、涙液補充による目の乾燥感は解消又は緩和されても装用時の異物感や痒みなどの不快感はなんら解消されない。従って、コンタクトレンズ装用者がよく訴える装用時の異物感や痒みなどの不快感を解消し、コンタクトレンズの快適な装用に有用なコンタクトレンズ用点眼剤が必要とされていた。
【0003】
通常、点眼剤にメントール等を清涼化剤や香料として配合することは公知であり、特開平7−118147号公報や特開平9−132526号公報でも開示されている。しかしながら、これらの点眼剤は、コンタクトレンズ装用時の使用を前提としていないことから、上記の課題を解決しうるものではない。即ち、清涼化剤はコンタクトレンズに吸着しやすく、レンズの物理化学的パラメーターを変化させたり、濡れ性を低下させる等の影響が大きいために、通常、清涼化剤を配合した点眼剤はコンタクトレンズ装用時の使用には不適切とされている。一方、ソフトコンタクトレンズへの成分の吸着を防ぐ方法として、特公昭55−15008号公報にはソフトコンタクトレンズへの殺菌剤の吸着を防止しうる殺菌剤組成物が開示されている。該公報には、非イオン性界面活性剤が、クロロヘキシジン、パラオキシ安息香酸エステル類及び4級アンモニウム塩類のコンタクトレンズへの吸着を防止することが示されているが、清涼化剤含有点眼剤によるコンタクトレンズの物理化学的パラメーターの変化及び/又は濡れ性の低下を防止する方法については、なんら示唆されていない。
【0004】
【発明が解決しようとする課題】
コンタクトレンズ装用者は乾燥感のみでなく、装用時の異物感や痒みなども訴えるが、従来の涙液型点眼剤では異物感や痒みまで解消することは困難であった。このような不快感を解消する手段として、清涼化剤を配合した点眼剤の開発が考えられるが、そのような清涼化剤は、コンタクトレンズの物理的パラメータを変化させたり、濡れ性を低下させる等、コンタクトレンズの性能に悪影響を及ぼすことから、清涼化剤を含有するコンタクトレンズ用点眼剤の実用化は困難であった。
【0005】
【課題を解決するための手段】
本発明者らは、上記課題を解決するべく、鋭意研究を重ねた結果、点眼剤に一定の条件下で清涼化剤を配合することにより、コンタクトレンズの物理化学的パラメーターの変化等の悪影響を及ぼさず、しかもレンズの濡れ性の良好なコンタクトレンズ用点眼剤を得ることに成功し、本発明を完成するに至った。即ち、本発明は清涼化剤を含有することを特徴とするコンタクトレンズ用点眼剤を提供するものである。本発明の点眼剤は1種又はそれ以上の界面活性剤を含有しており、非イオン性界面活性剤及び/又は両性界面活性剤を含有することが好ましく、これらを同時に含有することが特に好ましい。
【0006】
【発明の実施の形態】
本発明は、メントール等の清涼化剤を含有する点眼剤に、特定の界面活性剤を配合すると、該点眼剤を用いたときコンタクトレンズの物理化学的パラメーターが変化せず、レンズの濡れ性の低下を防ぎ、むしろ向上させることができるという知見に基づいている。本発明の点眼剤に含有される清涼化剤として、l−メントール、d−メントール、dl−メントール、d−カンフル、dl−カンフル、d−ボルネオール、dl−ボルネオール、ゲラニオール、ユーカリ油、ベルガモット油、ウィキョウ油、ハッカ油、ローズ油、クールミントが例示され、本発明の点眼剤は、これらを1又はそれ以上含有していてよい。これらの化合物は、レンズの物理化学的パラメーターを変化させず、点眼時に眼刺激を生じることのない濃度で配合されることが好ましく、そのような濃度は、コンタクトレンズの材質等により変動するが、通常、0.0001〜0.05%の範囲で使用され、0.001〜0.01%の範囲であることが好ましい。0.0001%未満の低濃度では、清涼化効果を期待できず、コンタクトレンズ装用時の不快感を解消することができない。
【0007】
本発明の点眼剤に用いることができる界面活性剤としては、当該技術分野で既知の眼科的に許容される非イオン性界面活性剤、両性界面活性剤、陰イオン性界面活性剤等から、コンタクトレンズに悪影響を及ぼさないことを条件として任意に選択できる。非イオン界面活性剤としてはポリオキシエチレン(POE)・ポリオキシプロピレン(POP)ブロックコポリマー、モノオレイン酸POE(20)ソルビタン等のPOEソルビタン脂肪酸エステル類、POE(60)硬化ヒマシ油等のPOE硬化ヒマシ油、POE(9)ラウリルエーテル等のPOEアルキルエーテル類、POE(20)POP(4)セチルエーテル等のPOE・POPアルキルエーテル類、POE(10)ノニルフェニルエーテル等のPOEアルキルフェニルエーテル類等が挙げられる。
【0008】
両性界面活性剤としては、アルキルポリアミノエチルグリシン等のグリシン型、ラウリルジメチルアミノ酢酸ベタイン等の酢酸ベタイン型、イミダゾリン型等の両性界面活性剤等が挙げられる。
また陰イオン界面活性剤としては、POE(10)ラウリルエーテルリン酸ナトリウム等のPOEアルキルエーテルリン酸及びその塩、ラウロイルメチルアラニンナトリウム等のN-アシルアミノ酸塩、アルキルエーテルカルボン酸塩、N-ココイルメチルタウリンナトリウム等のN-アシルタウリン塩、テトラデセンスルホン酸ナトリウム等のスルホン酸塩、ラウリル硫酸ナトリウム等のアルキル硫酸塩、POE(3)ラウリルエーテル硫酸ナトリウム等のPOEアルキルエーテル硫酸塩、α−オレフィンスルホン酸塩等が挙げられる。
【0009】
本発明に用いる界面活性剤としては、非イオン性界面活性剤と両性界面活性剤の組合せが好ましい。配合する量は、清涼化剤がコンタクトレンズに及ぼす物理的パラメータの変化を防止しうるに十分な量であれば、特に限定されない。通常、清涼化剤に対して10から100倍となるように配合でき、10から50倍となるように配合することが好ましい。10倍未満の量ではレンズの物理的パラメータが変化してしまい、100倍より多くなると界面活性剤自体がレンズに吸着する可能性があるので好ましくない。
【0010】
本発明の点眼剤には、更に無機塩類、充血除去剤、消炎剤、収れん剤、抗ヒスタミン剤、ビタミン類、アミノ酸類、細胞賦活剤、抗菌剤等の有効成分や、緩衝剤、等張化剤、増粘剤、キレート剤、安定化剤、pH調節剤、防腐剤等の各種添加剤をコンタクトレンズの物理化学的パラメーターに影響を及ぼさず、眼刺激等の問題がない範囲内で適宜配合することができる。
【0011】
緩衝剤としては、ホウ酸緩衝剤、リン酸緩衝剤、炭酸緩衝剤、クエン酸緩衝剤、酢酸緩衝剤、イプシロンアミノカプロン酸、アスパラギン酸塩等、等張化剤としては塩化ナトリウム、塩化カリウム、グリセリン、プロピレングリコール、ブドウ糖、マンニトール、ソルビトール等が挙げられる。
【0012】
増粘剤としては、アラビアゴム末、アルギン酸ナトリウム、アルギン酸プロピレングリコールエステル、コンドロイチン硫酸ナトリウム、ソルビトール、デキストラン70、トラガント末、メチルセルロース、カルボキシメチルセルロース、ヒドロキシエチルセルロース、ヒドロキシプロピルメチルセルロース、カルボキシビニルポリマー、ポリビニルアルコール、ポリビニルピロリドン、マクロゴール4000等が挙げられる。これらのうち、メチルセルロース、ヒドロキシエチルセルロース、ヒドロキシプロピルメチルセルロース、ポリビニルアルコール、ポリビニルピロリドンは低濃度でも適切な粘度の溶液が得られる点で優れており、更に、ヒドロキシエチルセルロース又はポリビニルピロリドンはコンタクトレンズへの影響が無く、安全性が高い点で好ましいが、特に限定されるものではない。これらの増粘剤を配合することにより、目の表面での滞留性が増し、保湿効果が高まるとともに、界面活性剤によるレンズの水濡れ効果を持続させることができる。
【0013】
キレート剤としては、エデト酸、エデト酸塩(エデト酸二ナトリウム、エデト酸カルシウム二ナトリウム、エデト酸三ナトリウム、エデト酸四ナトリウム)、ニトリロ三酢酸及びその塩、トリヒドロキシメチルアミノメタン、ヘキサメタリン酸ソーダ、クエン酸等、安定化剤としては、エデト酸塩類、亜硫酸水素ナトリウム等が挙げられる。
【0014】
pH調節剤としては、水酸化ナトリウム、水酸化カリウム、炭酸ナトリウム、塩酸、クエン酸、リン酸、酢酸等が挙げられる。
【0015】
また、防腐剤又は保存剤としては、ソルビン酸、ソルビン酸カリウム、パラオキシ安息香酸ブチル、パラオキシ安息香酸プロピル、パラオキシ安息香酸メチル、グルコン酸クロロヘキシジン、塩化ベンザルコニウム、塩化ベンゼトニウム、アルキルポリアミノエチルグリシン、クロロブタノール等が挙げられる。
【0016】
本発明のコンタクトレンズ用点眼剤は、上記pH調整剤等を用いてpHを約5.0〜9.0、好ましくは6.5〜8.5の範囲に調整する。ソフトコンタクトレンズに適用する場合は、特に5.5〜8.0の範囲で調整する。また、浸透圧比は上記の等張化剤等を用いて0.5〜2.0、より好ましくは1.0付近に調整する。
【0017】
以下に、実施例を挙げて、本発明を詳しく説明するが、本発明はこれらに限定されるものではない。
実施例1〜6
以下の表1に記載の処方に従って、本発明のコンタクトレンズ用点眼剤を調製する。
【0018】
【表1】
【0019】
比較例1
100ml中
塩化ナトリウム 0.44g
塩化カリウム 0.08g
ホウ酸 0.30g
ホウ砂 0.035g
滅菌精製水 適量
全量 100ml
以上を無菌的に調合充填し、人工涙液型点眼剤とする。
【0020】
試験例1 水濡れ効果
(接触角の測定方法)
本発明の点眼剤のコンタクトレンズ表面の水濡れ効果を下記の実験系を用いて評価した。即ち、固体平面に液滴を一滴のせたときに、その固体材質と液滴及び空気層の組み合わせによって、液滴が固体平面上半球状になる。そのとき液滴の表面が固体面と交差する点で、水面に引いた切線と平面のなす角度(液滴を含む角)を測定する。その角度をシータ(θと略称する)で表すと、θが小さいほど、液滴の固体表面への親和性が大きく、液滴を構成する液体(例、点眼薬)が固体に対して、いわゆる濡れやすい溶液であること、または、コンタクトレンズ表面が濡れやすい状態であることを意味する。以下の実験例では、本発明の目的に沿ってこの評価法をさらに発展させた実験系を用いる。具体的には、コンタクトレンズを水平に静置させてそのフロントカーブ(角膜と接触しない側)上に点眼薬の液滴を一滴のせ、そのθを測定することにより水濡れ効果を評価する。なお、コンタクトレンズ自体が一定の曲率を有する球の一部であるので、コンタクトレンズに由来する角度を予め測定しておき(θaとする)、後にコンタクトレンズ上で測定した液滴の角度(θbとする)から差し引いて補正する必要がある。
(θ=θb−θa)
θの測定は、コンタクトレンズ上にのせた液滴を側面から写真撮影する方法やビデオカメラを用いる画像処理装置を用いる方法で、容易に行うことができる。
【0021】
(試験方法)
表2に記載の処方で実施例7〜9と、比較例2の点眼剤を調製し、試験液とした。また、試験にはシードA−1(シード社製、酸素透過性ハードコンタクトレンズ)を用いた。
試験開始前に、蒸留水を1滴レンズ上にのせ、上記の評価法に従いθを測定した。その後、試験液5mlを15ml共栓付きガラス瓶に入れ、レンズを浸漬させ、34℃の水槽中で70回/分、24時間浸とうした。浸とう後レンズを取り出し、蒸留水を1滴レンズ上にのせ、再び上記の評価法に従いθを測定した。θの測定は画像処理装置を用いて行い、試験開始前(浸漬前)及び浸漬後のθを比較して、水濡れ効果の評価を行った。
【0022】
(結果)
結果を表2に示す。実施例7の点眼剤では、浸漬前に比べて浸漬後のθが低下しており、濡れ性がかなり向上していることがわかる。また、実施例8、9の点眼剤ではほとんど変化はなかった。それに対して比較例2の点眼剤では、θがかなり上昇しており、濡れ性が悪くなっている。
【0023】
【表2】
【0024】
試験例2 官能試験
(試験方法)
実施例1のコンタクトレンズ用点眼剤及び比較例1の人工涙液型点眼剤を調製し、酸素透過性ハードコンタクトレンズ装用者21名に対して、コンタクトレンズ装用時の乾燥感、痒み、異物感、疲れ目改善効果に関する官能試験を実施した。試験期間中に症状が現れた回答者数に対し、何らかの改善効果があったと評価した回答者数の割合で評価した。
【0025】
(結果)
結果を表3に示す。その結果、実施例1の点眼剤が眼乾燥感以外の全ての項目において比較例1の点眼剤よりも高い改善率を示し、本発明の点眼剤はコンタクトレンズ装用中の痒み、異物感、疲れ目などに対して優れた改善効果を有することが明らかとなった。
【0026】
【表3】
【0027】
試験例3 コンタクトレンズのサイズに及ぼす影響
(試験方法)
表4に記載の処方で、実施例10、11及び比較例3の1−メントールと界面活性剤とを含有する点眼剤を調製して試験液とした。
試験には、メニコンEX(メニコン社製)、オーツーフレッシュ(ニチコン社製)、ボシュロムEX−02(ボシュロム社製)、ホヤハード/58(HOYA社製)、シードA1(シード社製)を用いた。
各点眼剤にレンズ1枚を浸漬し、34℃で1ケ月振とうした。なお試験液は、1週間毎に交換した。浸漬後、レンズを取り出してレンズサイズを万能投影機(V−12A(NIKON社製))で測定し、試験開始時のサイズと比較することにより、変化の有無を観察した。視力補正用コンタクトレンズ基準に準じ、試験開始時と終了時のレンズサイズの変化が±0.05mm以上の場合に変化有りと判定した。
【0028】
(結果)
結果を表4に示す。比較例3の点眼剤ではサイズ変化が認められたが、実施例10及び11の点眼剤では認められなかった。
【0029】
【表4】
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to eye drops for contact lenses containing a refreshing agent, and more particularly to eye drops that can be instilled when wearing contact lenses.
[0002]
[Prior art]
Various artificial tear drops are commercially available to relieve discomfort when wearing contact lenses, but many of these contain inorganic salts and metal chelating agents, reducing tears. Even if it is useful for relieving the dryness of the eyes, there is no effect of relieving discomfort such as foreign body sensation and itchiness that are often appealed by contact lens wearers.
Contact lenses are very easy to adsorb drugs, especially organic compounds, and easily accumulate in the lenses, and the physical parameters of the lens are significantly affected by the pH and osmotic pressure of the drug applied to the contact lenses. It is known to receive. Because of such special characteristics, the eye drops that can be applied when wearing contact lenses usually contain only inorganic salts. However, as described above, such eye drops do not eliminate any discomfort such as foreign body feeling or itchiness during wearing even if the dryness of the eyes due to supplementation of tears is eliminated or alleviated. Therefore, there has been a need for eye drops for contact lenses that are useful for comfortable wearing of contact lenses, eliminating the discomfort such as foreign body feeling and itchiness that are often appealed by contact lens wearers.
[0003]
Usually, it is known to add menthol or the like to eye drops as a cooling agent or a fragrance, and it is also disclosed in JP-A-7-118147 and JP-A-9-132526. However, since these eye drops are not premised on the use at the time of wearing a contact lens, the above problems cannot be solved. That is, since the refreshing agent is easily adsorbed on the contact lens and has a great influence such as changing the physicochemical parameters of the lens or lowering the wettability, the eye drop containing the refreshing agent is usually a contact lens. It is considered inappropriate for wearing. On the other hand, as a method for preventing the adsorption of components to the soft contact lens, Japanese Patent Publication No. 55-15008 discloses a bactericide composition capable of preventing the bactericide from adsorbing to the soft contact lens. The publication shows that nonionic surfactants prevent adsorption of chlorohexidine, paraoxybenzoates and quaternary ammonium salts to contact lenses. There is no suggestion of a method for preventing a change in the physicochemical parameters of the lens and / or a decrease in wettability.
[0004]
[Problems to be solved by the invention]
The contact lens wearer complains not only of dryness but also of foreign body sensation and itchiness at the time of wearing, but it has been difficult to eliminate the foreign body sensation and itchiness with conventional tear drops. As a means for resolving such discomfort, it is conceivable to develop eye drops containing a refreshing agent. Such a refreshing agent changes physical parameters of contact lenses or reduces wettability. Since it adversely affects the performance of contact lenses, it has been difficult to put eye drops for contact lenses containing a cooling agent into practical use.
[0005]
[Means for Solving the Problems]
As a result of intensive studies to solve the above problems, the present inventors have mixed adverse effects such as changes in physicochemical parameters of contact lenses by adding a cooling agent to eye drops under certain conditions. However, the present inventors have succeeded in obtaining eye drops for contact lenses that have good lens wettability and have completed the present invention. That is, this invention provides the eye drop for contact lenses characterized by containing a refreshing agent. The eye drop of the present invention contains one or more surfactants, preferably contains a nonionic surfactant and / or an amphoteric surfactant, and particularly preferably contains them simultaneously. .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, when a specific surfactant is added to an eye drop containing a cooling agent such as menthol, the physicochemical parameters of the contact lens are not changed when the eye drop is used, and the wettability of the lens is reduced. It is based on the knowledge that it can prevent and rather improve the decline. As a refreshing agent contained in the eye drop of the present invention, 1-menthol, d-menthol, dl-menthol, d-camphor, dl-camphor, d-borneol, dl-borneol, geraniol, eucalyptus oil, bergamot oil, Examples include fennel oil, peppermint oil, rose oil, and cool mint, and the eye drop of the present invention may contain one or more of these. These compounds are preferably blended at concentrations that do not change the physicochemical parameters of the lens and do not cause eye irritation when instilled, and such concentrations vary depending on the material of the contact lens, Usually, it is used in the range of 0.0001 to 0.05%, and preferably in the range of 0.001 to 0.01%. If the concentration is less than 0.0001%, a refreshing effect cannot be expected, and discomfort when wearing contact lenses cannot be eliminated.
[0007]
Examples of the surfactant that can be used in the eye drop of the present invention include ophthalmically acceptable nonionic surfactants, amphoteric surfactants, anionic surfactants, and the like known in the art. It can be arbitrarily selected on the condition that the lens is not adversely affected. Nonionic surfactants include polyoxyethylene (POE) and polyoxypropylene (POP) block copolymers, POE sorbitan fatty acid esters such as monooleic acid POE (20) sorbitan, and POE curing such as POE (60) hydrogenated castor oil. Castor oil, POE alkyl ethers such as POE (9) lauryl ether, POE / POP alkyl ethers such as POE (20) POP (4) cetyl ether, POE alkyl phenyl ethers such as POE (10) nonylphenyl ether, etc. Is mentioned.
[0008]
Examples of the amphoteric surfactant include amphoteric surfactants such as a glycine type such as alkylpolyaminoethylglycine, a betaine acetate type such as lauryldimethylaminoacetic acid betaine, and an imidazoline type.
Anionic surfactants include POE alkyl ether phosphates such as POE (10) sodium lauryl ether phosphate and salts thereof, N-acyl amino acid salts such as sodium lauroylmethylalanine, alkyl ether carboxylates, N-cocoyl. N-acyl taurine salts such as sodium methyltaurine, sulfonates such as sodium tetradecene sulfonate, alkyl sulfates such as sodium lauryl sulfate, POE alkyl ether sulfates such as POE (3) sodium lauryl ether sulfate, α-olefins Examples thereof include sulfonates.
[0009]
As the surfactant used in the present invention, a combination of a nonionic surfactant and an amphoteric surfactant is preferable. The amount to be blended is not particularly limited as long as it is an amount sufficient to prevent a change in physical parameters exerted by the cooling agent on the contact lens. Usually, it can mix | blend so that it may become 10 to 100 times with respect to a refreshing agent, It is preferable to mix | blend so that it may become 10 to 50 times. If the amount is less than 10 times, the physical parameters of the lens change, and if it exceeds 100 times, the surfactant itself may be adsorbed to the lens, which is not preferable.
[0010]
The eye drops of the present invention further include active ingredients such as inorganic salts, decongestants, anti-inflammatory agents, astringents, antihistamines, vitamins, amino acids, cell activators, antibacterial agents, buffers, isotonic agents, Add various additives such as thickeners, chelating agents, stabilizers, pH regulators, preservatives, etc., as long as they do not affect the physicochemical parameters of the contact lens and do not cause problems such as eye irritation. Can do.
[0011]
Buffers include borate buffer, phosphate buffer, carbonate buffer, citrate buffer, acetate buffer, epsilon aminocaproic acid, aspartate, and isotonic agents such as sodium chloride, potassium chloride, glycerin , Propylene glycol, glucose, mannitol, sorbitol and the like.
[0012]
As thickeners, gum arabic powder, sodium alginate, propylene glycol alginate, sodium chondroitin sulfate, sorbitol, dextran 70, tragacanth powder, methylcellulose, carboxymethylcellulose, hydroxyethylcellulose, hydroxypropylmethylcellulose, carboxyvinyl polymer, polyvinyl alcohol, polyvinyl Examples include pyrrolidone and macrogol 4000. Among these, methylcellulose, hydroxyethylcellulose, hydroxypropylmethylcellulose, polyvinyl alcohol, and polyvinylpyrrolidone are excellent in that a solution having an appropriate viscosity can be obtained even at a low concentration, and further, hydroxyethylcellulose or polyvinylpyrrolidone has an effect on contact lenses. There is no particular limitation, although it is preferable in terms of high safety. By blending these thickeners, the retention on the eye surface is increased, the moisturizing effect is enhanced, and the water wetting effect of the lens by the surfactant can be maintained.
[0013]
Chelating agents include edetic acid, edetate (disodium edetate, disodium calcium edetate, trisodium edetate, tetrasodium edetate), nitrilotriacetic acid and its salts, trihydroxymethylaminomethane, sodium hexametaphosphate Examples of stabilizers such as citric acid include edetates and sodium bisulfite.
[0014]
Examples of the pH adjuster include sodium hydroxide, potassium hydroxide, sodium carbonate, hydrochloric acid, citric acid, phosphoric acid, acetic acid and the like.
[0015]
Further, as preservatives or preservatives, sorbic acid, potassium sorbate, butyl paraoxybenzoate, propyl paraoxybenzoate, methyl paraoxybenzoate, chlorohexidine gluconate, benzalkonium chloride, benzethonium chloride, alkylpolyaminoethylglycine, chloro Examples include butanol.
[0016]
The eye drop for contact lenses of the present invention is adjusted to a pH of about 5.0 to 9.0, preferably 6.5 to 8.5, using the above pH adjuster or the like. When applied to soft contact lenses, it is adjusted in the range of 5.5 to 8.0. Further, the osmotic pressure ratio is adjusted to 0.5 to 2.0, more preferably around 1.0 using the above-mentioned tonicity agent and the like.
[0017]
Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited thereto.
Examples 1-6
The eye drop for contact lenses of the present invention is prepared according to the formulation described in Table 1 below.
[0018]
[Table 1]
[0019]
Comparative Example 1
Sodium chloride in 100ml 0.44g
Potassium chloride 0.08g
Boric acid 0.30g
0.035 g of borax
Sterile purified water Appropriate amount
100ml total volume
The above is prepared and filled aseptically to obtain an artificial tear solution type eye drop.
[0020]
Test Example 1 Wetting effect (Measuring method of contact angle)
The water wetting effect on the contact lens surface of the eye drop of the present invention was evaluated using the following experimental system. That is, when a single droplet is placed on the solid plane, the droplet becomes hemispherical on the solid plane due to the combination of the solid material, the droplet, and the air layer. At that time, at the point where the surface of the liquid droplet intersects the solid surface, the angle (angle including the liquid droplet) formed by the cut line drawn on the water surface and the plane is measured. When the angle is expressed by theta (abbreviated as θ), the smaller θ is, the greater the affinity of the droplet to the solid surface is, and the liquid (eg, eye drops) constituting the droplet is a so-called solid. It means that the solution is easily wetted, or the contact lens surface is easily wetted. In the following experimental examples, an experimental system in which this evaluation method is further developed in accordance with the object of the present invention is used. Specifically, the contact lens is placed horizontally and a drop of eye drop is placed on the front curve (the side not in contact with the cornea), and the water wetting effect is evaluated by measuring the θ. Since the contact lens itself is a part of a sphere having a certain curvature, the angle derived from the contact lens is measured in advance (referred to as θa), and the droplet angle (θb) measured later on the contact lens is measured. It is necessary to correct by subtracting.
(Θ = θb−θa)
The measurement of θ can be easily performed by a method of taking a photograph of a droplet placed on a contact lens from the side or a method using an image processing apparatus using a video camera.
[0021]
(Test method)
The eye drops of Examples 7 to 9 and Comparative Example 2 were prepared with the formulations shown in Table 2, and used as test solutions. Moreover, seed A-1 (The seed company make, oxygen-permeable hard contact lens) was used for the test.
Before starting the test, distilled water was placed on a one-drop lens, and θ was measured according to the above evaluation method. Thereafter, 5 ml of the test solution was placed in a glass bottle with a 15 ml stopper, the lens was immersed, and immersed in a water bath at 34 ° C. for 70 times / minute for 24 hours. After immersion, the lens was taken out, and distilled water was placed on the one-drop lens, and θ was measured again according to the above evaluation method. The measurement of θ was performed using an image processing apparatus, and the water wetting effect was evaluated by comparing θ before the start of the test (before immersion) and after the immersion.
[0022]
(result)
The results are shown in Table 2. In the eye drop of Example 7, it can be seen that θ after immersion is lower than that before immersion, and wettability is considerably improved. Moreover, there was almost no change in the eye drops of Examples 8 and 9. On the other hand, in the eye drop of Comparative Example 2, θ is considerably increased and the wettability is deteriorated.
[0023]
[Table 2]
[0024]
Test example 2 sensory test (test method)
The eye drop for contact lens of Example 1 and the artificial tear liquid type eye drop of Comparative Example 1 were prepared, and the dry feeling, itchiness, and foreign body sensation at the time of wearing the contact lens were given to 21 oxygen permeable hard contact lens wearers. Then, a sensory test on the effect of improving fatigue eyes was performed. The number of respondents who evaluated that there was some improvement effect was evaluated against the number of respondents who developed symptoms during the study period.
[0025]
(result)
The results are shown in Table 3. As a result, the eye drop of Example 1 showed a higher improvement rate than the eye drop of Comparative Example 1 in all items other than dry eye feeling. It has been clarified that it has an excellent improvement effect on eyes and the like.
[0026]
[Table 3]
[0027]
Test Example 3 Influence on Contact Lens Size (Test Method)
Eye drops containing 1-menthol and surfactants of Examples 10 and 11 and Comparative Example 3 were prepared according to the formulations shown in Table 4 to prepare test solutions.
For the test, Menicon EX (manufactured by Menicon Corporation), O2 Fresh (manufactured by Nichicon Corporation), Bossrom EX-02 (manufactured by Boschrom Corporation), Hoya Hard / 58 (manufactured by HOYA Corporation), and seed A1 (manufactured by Seed Corporation) were used.
One lens was immersed in each eye drop and shaken at 34 ° C. for 1 month. The test solution was changed every week. After immersion, the lens was taken out, the lens size was measured with a universal projector (V-12A (manufactured by NIKON)), and the presence or absence of change was observed by comparing with the size at the start of the test. According to the vision correction contact lens standard, it was determined that there was a change when the change in the lens size at the start and end of the test was ± 0.05 mm or more.
[0028]
(result)
The results are shown in Table 4. A change in size was observed in the eye drop of Comparative Example 3, but not in the eye drops of Examples 10 and 11.
[0029]
[Table 4]
Claims (22)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003071181A JP4135905B2 (en) | 2003-03-17 | 2003-03-17 | Eye drops for contact lenses containing a cooling agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003071181A JP4135905B2 (en) | 2003-03-17 | 2003-03-17 | Eye drops for contact lenses containing a cooling agent |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34903797A Division JP4274593B2 (en) | 1997-12-18 | 1997-12-18 | Eye drops for contact lenses containing a cooling agent |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2007145209A Division JP5477798B2 (en) | 2007-05-31 | 2007-05-31 | Eye drops for contact lenses containing a cooling agent |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2003279906A JP2003279906A (en) | 2003-10-02 |
| JP2003279906A5 JP2003279906A5 (en) | 2005-03-03 |
| JP4135905B2 true JP4135905B2 (en) | 2008-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| JP2003071181A Expired - Lifetime JP4135905B2 (en) | 2003-03-17 | 2003-03-17 | Eye drops for contact lenses containing a cooling agent |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4718160B2 (en) * | 2003-11-12 | 2011-07-06 | ロート製薬株式会社 | Ophthalmic composition |
| JP5401113B2 (en) * | 2008-02-07 | 2014-01-29 | ロート製薬株式会社 | Aqueous composition containing chlorous acid compounds containing menthols |
| JP2013032393A (en) * | 2012-11-09 | 2013-02-14 | Rohto Pharmaceutical Co Ltd | Eye drop for contact lens containing refrigerative agent |
| TWI607768B (en) * | 2017-03-31 | 2017-12-11 | 晶碩光學股份有限公司 | Composition for contact lenses and method for caring contact lenses |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2822058B2 (en) * | 1989-05-29 | 1998-11-05 | ゼリア新薬工業株式会社 | Stable eye drops |
| JPH0816042B2 (en) * | 1989-08-08 | 1996-02-21 | ロート製薬株式会社 | Liquid for contact lenses |
| JP3689123B2 (en) * | 1993-10-22 | 2005-08-31 | ライオン株式会社 | Vitamin A solubilized aqueous eye drops |
| JP3597239B2 (en) * | 1994-03-31 | 2004-12-02 | ライオン株式会社 | Stable eye drops |
| WO1997028827A1 (en) * | 1996-02-07 | 1997-08-14 | Rohto Pharmaceutical Co., Ltd. | Ophthalmic composition with regulated viscosity |
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| JP2003279906A (en) | 2003-10-02 |
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