WO2010095478A1 - 薬物徐放性ハイドロゲルコンタクトレンズ及び薬物徐放性ハイドロゲルコンタクトレンズを用いた薬物放出方法 - Google Patents
薬物徐放性ハイドロゲルコンタクトレンズ及び薬物徐放性ハイドロゲルコンタクトレンズを用いた薬物放出方法 Download PDFInfo
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—Lenses
- G02B1/043—Contact lenses
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
- A61K9/0012—Galenical forms characterised by the site of application
- A61K9/0048—Eye, e.g. artificial tears
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
- A61K9/0012—Galenical forms characterised by the site of application
- A61K9/0048—Eye, e.g. artificial tears
- A61K9/0051—Ocular inserts, ocular implants
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P27/00—Drugs for disorders of the senses
- A61P27/02—Ophthalmic agents
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P27/00—Drugs for disorders of the senses
- A61P27/02—Ophthalmic agents
- A61P27/14—Decongestants or antiallergics
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- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
- G02C7/04—Contact lenses for the eyes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
- A61F9/0008—Introducing ophthalmic products into the ocular cavity or retaining products therein
- A61F9/0017—Introducing ophthalmic products into the ocular cavity or retaining products therein implantable in, or in contact with, the eye, e.g. ocular inserts
Definitions
- the present invention relates to a drug sustained-release hydrogel contact lens and a drug release method using the same, and more specifically, for a daily disposable that can effectively and slowly release an anionic ophthalmic drug in a relatively short time.
- the present invention relates to a drug sustained-release hydrogel contact lens suitable for the above contact lenses and a drug release method using the same.
- the number of contact lens wearers has reached 16 million and is widely recognized as the most familiar medical device.
- hydrogel contact lenses account for more than 70% of the total, and the daily disposable hydrogel contact lenses have the highest share.
- the wearing time of a daily disposable hydrogel contact lens is about 18 hours at the longest.
- Eye disorders include glaucoma, infections, and allergies.
- Seasonal eye allergies, particularly hay fever, are common in daily life, and there is a need for simple and efficient treatment methods. Yes.
- This eye allergy treatment is widely used in the form of sodium cromoglycate as an ophthalmic solution, but since this drug is irritating when instilled, it can be irritated by adding a cooling agent or mucopolysaccharide. It is necessary to relax the use (see Japanese Patent Application Laid-Open No. 2004-59583 and Japanese Patent Application Laid-Open No. 2005-187407, the description of which is specifically incorporated herein by reference).
- Japanese Patent Application Laid-Open No. 2004-59583 alleviates the irritation and foreign body sensation of a sodium cromoglycate-containing solution by incorporating a refreshing agent.
- Japanese Patent Application Laid-Open No. 2005-187407 is a technique for reducing eye irritation by increasing the viscosity of tears with the added mucopolysaccharide and suppressing the absorption of sodium cromoglycate.
- these methods are not sufficient methods for alleviating eye irritation of sodium cromoglycate, and it is actually necessary to add other drugs.
- 2004-307574 uses 2 to 50 mol% of a cationic monomer as a constituent of a hydrogel, and 30 to 90 mol% of an anionic monomer with respect to this cationic monomer.
- a drug sustained-release contact lens that gradually releases an anionic drug having a sulfo group or a phosphate group as a therapeutic agent.
- Japanese Patent Application Laid-Open No. 2003-301014 is an ionic ophthalmic lens comprising a copolymer of a hydrophilic monomer and a methacrylate having a phosphate group in the side chain, and a sustained drug release having a cationic substituent inside the polymer. It is a sexual eye lens.
- an object of the present invention is to provide a technique for hypoallergenic and effective administration of an allergy therapeutic agent for seasonal eye diseases.
- an object of the present invention is to provide a drug sustained-release hydrogel contact lens capable of slowly releasing an anionic drug such as an allergy treatment drug with low irritation and effectively while correcting vision.
- an object of the present invention is to provide a drug sustained-release hydrogel contact lens that can be used for a daily disposable contact lens and can release a drug for allergy treatment in a relatively short time.
- the drug sustained-release hydrogel contact lens according to the present invention is a drug sustained-release hydrogel contact lens for releasing a drug slowly, and contains an initial release amount from about 4 hours after the start of wearing. 50% or less of the total amount of the drug and 80% or more of the drug contained in the drug sustained-release hydrogel contact lens is released in at least 14 hours.
- the drug sustained-release hydrogel contact lens according to the present invention is a hydrogel comprising at least a cationic monomer and an ionic monomer that is an anionic monomer, and the composition ratio of the ionic monomer is the gel.
- the content of the anionic monomer with respect to the cationic monomer is from 15 mol% to 25 mol% with respect to the total amount of the monomers constituting the composition.
- the drug sustained-release hydrogel contact lens according to the present invention is characterized by containing 0.5 to 5.0 mg of an anionic drug having at least one carboxyl group.
- the anionic drug is sodium cromoglycate or potassium cromoglycate.
- the present invention it is possible to provide a drug sustained-release hydrogel contact lens capable of effectively and slowly releasing a drug for allergy treatment while correcting vision. Therefore, in the case of seasonal eye diseases such as hay fever, medication can be performed while wearing contact lenses before the onset of the disease, so compliance with medication can be maintained even when the patient's treatment awareness is low, and safe preventive medicine can be realized. .
- the allergy treatment drug is effectively used in a daily disposable contact lens because it effectively completes sustained release in about 18 hours.
- the present invention has been made as a result of repeated studies on an appropriate amount of an anionic drug used for allergy treatment by wearing a contact lens, a sustained release time, and a method capable of minimizing eye irritation.
- the present inventors examined a method for controlling an initial release amount of an anionic drug having eye irritation, particularly sodium cromoglycate used for hay fever and the like.
- the process of sustained release of an anionic drug from a contact lens is such that the drug contained in the vicinity of the lens surface is first released into the tear fluid and then ionic interaction with the cationic group in the lens material.
- the anionic drug that forms is released by the ion exchange reaction with the negative ion component in tear fluid and is released continuously.
- the time and amount of sustained release depend on the behavior of the contained drug in the lens, and this can be controlled by the crosslinking density of the material.
- the initial release amount of the anionic drug from immediately after wearing the contact lens is controlled to about 4 hours.
- the initial release amount of the anionic drug content contained in the contact lens is limited to 1/2 or less of the total amount of the drug contained in the contact lens, and the remaining amount is gradually released. is there.
- the remaining amount is preferably completed in about 14 to 18 hours after wearing.
- the drug sustained-release hydrogel contact lens according to the present invention is a hydrogel comprising at least a cationic monomer and an ionic monomer that is an anionic monomer, and the constituent ratio of the ionic monomer is that of the monomer constituting the gel.
- the content of the anionic monomer with respect to the cationic monomer is 15 mol% or more and 25 mol% or less with respect to the total amount.
- usable ionic monomers include cationic monomers having dissociation properties for cations and anionic monomers having dissociation properties for anions.
- the anionic monomer that can be used in the present invention is not particularly limited as long as it is a monomer having a so-called anionic group such as a carboxyl group, a phosphate group, and a sulfo group.
- a so-called anionic group such as a carboxyl group, a phosphate group, and a sulfo group.
- (meth) acrylic Acid, methacryloxyethyl succinic acid, (meth) acryloyloxyethyl phosphate, (meth) acryloyloxymethyl phosphate, and the like can be mentioned, and methacryloxyethyl succinic acid is particularly preferable.
- cationic monomers examples include so-called cationic groups such as ammonium groups such as tertiary amino groups, guanidino groups, and amidino groups, quaternary ammonium groups, sulfonium groups, oxonium groups, and phosphonium groups.
- cationic groups such as ammonium groups such as tertiary amino groups, guanidino groups, and amidino groups, quaternary ammonium groups, sulfonium groups, oxonium groups, and phosphonium groups.
- cationic groups such as ammonium groups such as tertiary amino groups, guanidino groups, and amidino groups, quaternary ammonium groups, sulfonium groups, oxonium groups, and phosphonium groups.
- vinylbenzyl such as vinylbenzyldimethylbenchylammonium salt, vinylbenzyldimethyl n-butylammonium salt, methacrylamidepropy
- Trialkylammonium salt especially ammonium chloride
- 2-methacryloxyethyltrimethylammonium salt 2-methacryloxyethyldimethylethylammonium salt
- 2-methacryloxyethyl Dimethyl n- pentyl ammonium methacrylate especially chloride
- a salt but the like, particularly preferably methacrylamide propyl trimethyl ammonium chloride.
- the compounding amount of an ionic monomer that is an anionic monomer or a cationic monomer is 5 mol% or more and 20 mol% or less with respect to the total amount of monomers constituting the drug sustained-release hydrogel contact lens. It is characterized by being used in.
- the total amount of ionic monomers in the lens material is more than 20 mol%, the content of anionic drugs can be increased.
- the proportion of ionic monomers increases, the water content of contact lenses increases and the crosslinking density increases. Since it becomes sparse, it becomes difficult to control the sustained release of the drug, and most of the anionic drug is released in a short time of about 3 hours.
- the amount is less than 5 mol%, the content of an anionic drug that can be contained in the drug sustained-release hydrogel contact lens also decreases, and effective drug release cannot be achieved. Sufficient water content cannot be obtained and the practicality as a soft contact lens is lacking.
- the anionic monomer content is 15 mol% or more and 25 mol% relative to the cationic monomer content. %, And the anionic drug can form an effective interaction by surplus of the cationic monomer with respect to the anionic monomer.
- the amount of the excess cationic group can be adjusted as long as the ratio of the anionic monomer is in the range of 15 to 25 mol%, and the content of the anionic drug can be appropriately selected.
- drug release control is affected by the intermolecular cross-linking of the contact lens material as well as the amount of ionic monomer.
- the content of the ionic monomer constituting the drug sustained-release hydrogel contact lens is 5 mol% or more and 20 mol% or less, the water content is decreased, so that the drug release control by the action of the crosslinking density is most effectively expressed.
- the proportion of the ionic monomer increases, the water content of the contact lens increases and the crosslink density becomes sparse, making it difficult to control the sustained release of the drug.
- the drug is released. That is, the object of the present invention that the release amount of the contained anionic drug after 4 hours of wearing is 1/2 or less cannot be achieved.
- the amount of each ionic monomer is preferably 15 to 25 mol% of the anionic monomer with respect to the cationic monomer.
- 2 to 50 mol% of the cationic monomer disclosed in JP-A No. 2004-307574 is used, and 30 to 90 mol% of the anionic monomer is used with respect to the cationic monomer.
- this is not preferable as a daily disposable contact lens which is the gist of the present invention.
- the drug sustained-release hydrogel contact lens according to the present invention is used for daily wear, not all of the contained anionic drug can be efficiently released and remains in the lens.
- the drug that can be used for the drug sustained-release hydrogel contact lens is not particularly limited, but an anionic drug is preferable.
- an anionic agent in this invention what has at least 1 or more carboxyl group in a molecule
- numerator is mentioned.
- an anionic drug having a carboxyl group is preferable in consideration of completing the sustained release in about 14 to 18 hours.
- anionic drug that can be used in the present invention, a drug having a carboxyl group is preferable, but there is no particular limitation, and examples include an anionic allergy drug for seasonal eye diseases.
- examples of the anionic allergy therapeutic agent include tranilast, acitazanilast hydrate, levocabastine hydrochloride, amlexanox, olopatadine and the like, among others, sodium cromoglycate and potassium cromoglycate.
- anionic drugs are not limited to allergic drugs, but antibacterial drugs such as lomefloxacin hydrochloride, ofloxacin, norfloxacin, levofloxacin, tosufloxacin, cataract drugs such as pirenoxine, glutathione, pranoprofen, sodium bromofenac, Anti-inflammatory analgesics such as diclofenac sodium. Moreover, you may use these in mixture of 2 or more types.
- cromoglycate sodium is known as an effective therapeutic agent for seasonal eye diseases, particularly hay fever, it is a therapeutic agent with high patient dissatisfaction due to its irritation, but according to the present invention. Such problems can also be solved.
- the content of the anionic drug can be effectively released in 14 to 18 hours, and is 0 per lens in consideration of functions such as the transparency of the contact lens and the vision correction power.
- 0.5 to 5.0 mg is preferred. If the content is more than 5.0 mg, eye irritation and foreign body sensation may occur in the initial release after wearing the contact lens, and if the content is less than 0.5 mg, the effectiveness of the drug cannot be expected.
- sodium cromoglycate is considered, it is more preferably 1.0 to 3.0 mg.
- the amount of the drug that can be taken in is appropriately adjusted depending on the excess amount of the cationic monomer that constitutes the drug sustained-release hydrogel contact lens.
- the present invention is a technique related to a daily disposable contact lens capable of effectively releasing an anionic drug in 14 to 18 hours, it is necessary to make the content of the anionic drug relatively small and to increase the release rate. There is. For this reason, it is the compounding quantity which decreases the quantity of the excess cationic group.
- examples of usable monomers in addition to the above cationic monomers and ionic monomers that are anionic monomers include hydrophilic monomers, hydrophobic monomers, and crosslinkable monomers.
- the hydrophilic monomer is added for the purpose of hydrating the obtained polymer to form a soft hydrogel and simultaneously incorporating an anionic drug, and at least one hydrophilic group in the molecule.
- a hydrophobic monomer can be used to control the water content for the purpose of controlling the sustained release of an anionic drug.
- a hydrophobic monomer By using a hydrophobic monomer, it is possible to adjust the water content, the amount of hydrophobic drug incorporated, and the like.
- hydrophobic monomers include trifluoroethyl methacrylate, methacrylamide, siloxanyl methacrylate, methyl methacrylate, n-butyl methacrylate, tert-butyl methacrylate, benzyl methacrylate, ethylhexyl methacrylate, and lauryl (meth) acrylate. Can be mentioned.
- a crosslinkable monomer can also be used to form intermolecular crosslinking of the contact lens material.
- the blending amount of the crosslinkable monomer is preferably 10 mol% or less with respect to the content of the monomer constituting the sustained-release drug hydrogel contact lens. If it exceeds 10 mol%, the lens becomes hard and inferior in practicality as a contact lens.
- the crosslinkable monomer that can be used in the present invention include bifunctional compounds such as ethylene glycol di (meth) acrylate, methylenebisacrylamide, and propylene glycol di (meth) acrylate.
- a refreshing agent such as menthol can be added to the storage solution for shipping the lens in order to exhibit a more comfortable wearing feeling.
- the refreshing agent menthol, camphor, and the like that can be used in eye drops can be added.
- menthol when menthol is blended in a shipping stock solution, it is preferably 0.01% or less, and if the cooling effect is not greatly expected, about 0.005% may be blended.
- Shape stability The contact lens before and after the release of sodium cromoglycate was measured in saline using a contact lens projector. When there was no size change or deformation before and after the release, it was marked with ⁇ .
- the water-containing copolymer was dried at room temperature for 1 day under reduced pressure, and the weight (W2) at that time was measured. Thereafter, the lens was immersed in pure water to completely saturate the lens with water, and the weight (W1) at that time was measured. From these weights, the water content was determined according to the following formula.
- Moisture content (% by weight) [(W1-W2) / W1] ⁇ 100 W1: Weight when saturated with water W2: Weight when the lens is dehydrated and dried
- Example 1 2-hydroxyethyl methacrylate (HEMA) (46.2 g; 0.35 mol), 2-hydroxypropyl methacrylate (HPMA) (37.6 g; 0.26 mol), methacrylamidopropyltrimethylammonium chloride in the proportions shown in Table 1.
- HEMA 2-hydroxyethyl methacrylate
- HPMA 2-hydroxypropyl methacrylate
- MATER 2-hydroxypropyl methacrylate
- MATERC methacryloxyethyl succinic acid
- MOESA methacryloxyethyl succinic acid
- EDMA ethylene glycol dimethacrylate
- AIBN azobisisobutyronitrile
- the monomer mixture was placed in a contact lens mold and heated in the range of 50 to 100 ° C. over 24 hours to obtain a polymer.
- the obtained polymer was returned to room temperature, taken out from the container, and hydrated and swollen by being immersed in distilled water at about 60 ° C. for about 4 hours.
- This contact lens was immersed in 10 mL of 0.05 wt% aqueous solution of sodium cromoglycate (DSCG) prepared in advance at 25 ° C. for 3 hours to contain sodium cromoglycate in the contact lens.
- DSCG sodium cromoglycate
- Example 2 HEMA (46.2 g; 0.35 mol), HPMA (37.6 g; 0.26 mol), MAPTAC (12.9 g; 0.058 mol), MOESA (2.5 g; 0.005 mol) in the proportions shown in Table 1. 011 mol), EDMA (0.8 g; 0.004 mol), and AIBN 3000 ppm (external) were mixed and stirred for about 1 hour with sufficient nitrogen substitution. After stirring, polymerization, hydration and swelling were carried out in the same manner as in Example 1 to contain sodium cromoglycate.
- Example 3 HEMA (46.2 g; 0.35 mol), HPMA (37.6 g; 0.26 mol), MAPTAC (13.3 g; 0.060 mol), MOESA (2.1 g; 009 mol), EDMA (0.8 g; 0.004 mol), and AIBN 3000 ppm (external) were mixed and stirred for about 1 hour with sufficient nitrogen substitution. After stirring, polymerization, hydration and swelling were carried out in the same manner as in Example 1 to contain sodium cromoglycate.
- Example 4 HEMA (54.4 g; 0.42 mol), HPMA (37.6 g; 0.26 mol), MAPTAC (6.65 g; 0.03 mol), MOESA (1.5 g; 007 mol), EDMA (0.7 g; 0.003 mol), and AIBN 3000 ppm (external) were mixed and stirred for about 1 hour while sufficiently purging nitrogen. After stirring, polymerization, hydration and swelling were carried out in the same manner as in Example 1 to contain sodium cromoglycate.
- Example 5 HEMA (41.6 g; 0.32 mol), HPMA (37.6 g; 0.26 mol), MAPTAC (24.2 g; 0.11 mol), MOESA (6.21 g; 027 mol), EDMA (0.8 g; 0.004 mol), and AIBN 3000 ppm (external) were mixed, and the mixture was stirred for about 1 hour with sufficient nitrogen substitution. After stirring, polymerization, hydration and swelling were carried out in the same manner as in Example 1 to contain sodium cromoglycate.
- Comparative Example 1 As a result of performing the same analysis and evaluation as in Example 1, in Comparative Example 1, the shape becomes unstable due to an increase in ionic monomers. In Comparative Example 2, since the content of the anionic monomer with respect to the cationic monomer is large, it is not possible to take in a sufficient amount of the drug to exert its effectiveness. In addition, since the release time of sodium cromoglycate becomes a long period of 24 hours or more, it is not suitable as a daily disposable contact lens. Comparative Example 3 did not contain a sufficient amount of sodium cromoglycate to show effectiveness because there was no cationic group contributing to sodium cromoglycate uptake.
- FIG. 1 shows the release rate of cromoglycate sodium in the eyes of Example 1, Comparative Example 1 and Comparative Example 2.
- FIG. 1 also shows that in Example 1, it is the release time of sodium cromoglycate that can be used as a daily disposable lens.
- Comparative Example 1 it was shown that 70% of the drug taken in the initial 4 hours was released due to the increase in the ionic monomer, which is inferior in practicality.
- Comparative Example 2 JP 2004-307574 A As shown in the above, since it is a sustained release over a long period of time, it has been shown that it is not practical as a one-day disposable lens.
- HEMA 2-hydroxyethyl methacrylate (hydrophilic monomer)
- HPMA 2-hydroxypropyl methacrylate (hydrophilic monomer)
- MAPTAC methacrylamidopropyltrimethylammonium chloride (cationic monomer)
- MOESA Methacryloxyethyl succinic acid (anionic monomer)
- EDMA Ethylene glycol dimethacrylate (crosslinkable monomer)
- MOEP Methacryloyloxyethyl phosphate (anionic monomer)
- AIBN Azobisisobutyronitrile (polymerization initiator)
- DSCG cromoglycate sodium (anionic drug)
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Abstract
Description
クロモグリク酸ナトリウムの取り込み量の測定
クロモグリク酸ナトリウムを含有したコンタクトレンズを生理食塩水中に48時間以上浸漬して含有しているクロモグリク酸ナトリウムをすべて生理食塩水中へ放出させた。放出後の生理食塩水中のクロモグリク酸ナトリウムを高速液体クロマトグラフィー(HPLC、日本分光(株)社製)で定量し、レンズ中のクロモグリク酸ナトリウム取り込み量とした。
白色家兎にクロモグリク酸ナトリウムを含有したコンタクトレンズを4時間及び18時間装着させ、取り外したコンタクトレンズを生理食塩水中に48時間以上浸漬して残存しているクロモグリク酸ナトリウムをすべて生理食塩水中へ放出させた。放出後の生理食塩水中のクロモグリク酸ナトリウムを高速液体クロマトグラフィー(HPLC、日本分光(株)社製)で定量し、レンズ中のクロモグリク酸ナトリウム残存量とした。この残存量から放出率を算出した。
クロモグリク酸ナトリウム放出前と放出後のコンタクトレンズを生理食塩水中で、コンタクトレンズ投影機を用いてレンズサイズを測定した。放出前後でサイズ変化、変形がない場合は○、サイズ変化、変形が認められた場合は×とした。
クロモグリク酸ナトリウムを含有したコンタクトレンズをヒトに装着し、装着初期の刺激及び異物感を評価した。刺激や異物を感じない場合は○、ごくわずかな刺激や異物を感じた場合は△、刺激や異物感が有る場合を×とした。
含水状の共重合体を減圧下、常温にて1昼夜乾燥させ、その際の重量(W2)を測定した。その後、純水に浸漬してレンズを水で完全に飽和させ、その際の重量(W1)を測定した。これらの重量から、下記式に従い、含水率を求めた。
W1:飽和含水時の重量
W2:レンズの脱水乾燥時の重量
表1に示す割合で2-ヒドロキシエチルメタクリレート(HEMA)(46.2g;0.35モル)、2-ヒドロキシプロピルメタクリレート(HPMA)(37.6g;0.26モル)、メタクリルアミドプロピルトリメチルアンモニウムクロライド(MAPTAC)(12.2g;0.055モル)、メタクリルオキシエチルコハク酸(MOESA)(3.2g;0.013モル)、エチレングリコールジメタクリレート(EDMA)(0.8g;0.004モル)、及びアゾビスイソブチロニトリル(AIBN)3000ppm(外部)を混合し、十分に窒素置換をしながら約1時間撹拌した。撹拌後、モノマー混合液をコンタクトレンズ用の成形型に入れ、50~100℃の範囲で24時間かけて昇温させ、重合体を得た。得られた重合体を室温に戻し、容器から取り出し、約60℃の蒸留水中に約4時間浸漬することで水和膨潤させた。このコンタクトレンズを、あらかじめ調製しておいたクロモグリク酸ナトリウム(DSCG)の0.05wt%水溶液10mL中に25℃、3時間浸漬させることでコンタクトレンズ中にクロモグリク酸ナトリウムを含有させた。
表1に示す割合でHEMA(46.2g;0.35モル)、HPMA(37.6g;0.26モル)、MAPTAC(12.9g;0.058モル)、MOESA(2.5g;0.011モル)、EDMA(0.8g;0.004モル)、及びAIBN3000ppm(外部)を混合し、十分に窒素置換をしながら約1時間撹拌した。撹拌後、実施例1と同様に重合、水和膨潤し、クロモグリク酸ナトリウムを含有させた。
表1に示す割合でHEMA(46.2g;0.35モル)、HPMA(37.6g;0.26モル)、MAPTAC(13.3g;0.060モル)、MOESA(2.1g;0.009モル)、EDMA(0.8g;0.004モル)、及びAIBN3000ppm(外部)を混合し、十分に窒素置換をしながら約1時間撹拌した。撹拌後、実施例1と同様に重合、水和膨潤し、クロモグリク酸ナトリウムを含有させた。
表1に示す割合でHEMA(54.4g;0.42モル)、HPMA(37.6g;0.26モル)、MAPTAC(6.65g;0.03モル)、MOESA(1.5g;0.007モル)、EDMA(0.7g;0.003モル)、及びAIBN3000ppm(外部)を混合し、十分に窒素置換をしながら約1時間撹拌した。撹拌後、実施例1と同様に重合、水和膨潤し、クロモグリク酸ナトリウムを含有させた。
表1に示す割合でHEMA(41.6g;0.32モル)、HPMA(37.6g;0.26モル)、MAPTAC(24.2g;0.11モル)、MOESA(6.21g;0.027モル)、EDMA(0.8g;0.004モル)、及びAIBN3000ppm(外部)を混合し、十分に窒素置換をしながら約1時間撹拌した。撹拌後、実施例1と同様に重合、水和膨潤し、クロモグリク酸ナトリウムを含有させた。
表1に示す割合でHEMA(49.1g;0.38モル)、HPMA(22.2g;0.15モル)、MAPTAC(28.9g;0.13モル)、MOESA(7.13g;0.031モル)、EDMA(0.7g;0.004モル)、及びAIBN3000ppm(外部)を混合し、十分に窒素置換をしながら約1時間撹拌した。撹拌後、実施例1と同様に重合、水和膨潤し、クロモグリク酸ナトリウムを含有させた。
表1に示す割合でHEMA(40.0g;0.51モル)、MAPTAC(11.37g;0.051モル)、メタクリロイルオキシエチルフォスフェート(MOEP)(5.41g;0.025モル)、EDMA(0.7g;0.004モル)、及びAIBN3000ppm(外部)を混合し、十分に窒素置換をしながら約1時間撹拌した。撹拌後、実施例1と同様に重合、水和膨潤し、クロモグリク酸ナトリウムを含有させた。
表1に示す割合でHEMA(51.2g;0.39モル)、HPMA(35.4g;0.24モル)、MAPTAC(6.4g;0.028モル)、MOESA(6.4g;0.028モル)、EDMA(0.6g;0.003モル)、及びAIBN3000ppm(外部)を混合し、十分に窒素置換をしながら約1時間撹拌した。撹拌後、実施例1と同様に重合、水和膨潤し、クロモグリク酸ナトリウムを含有させた。
HPMA:2-ヒドロキシプロピルメタクリレート(親水性モノマー)
MAPTAC:メタクリルアミドプロピルトリメチルアンモニウムクロライド(カチオン性モノマー)
MOESA:メタクリルオキシエチルコハク酸(アニオン性モノマー)
EDMA:エチレングリコールジメタクリレート(架橋性モノマー)
MOEP:メタクリロイルオキシエチルフォスフェート(アニオン性モノマー)
AIBN:アゾビスイソブチロニトリル(重合開始剤)
DSCG:クロモグリク酸ナトリウム(アニオン性薬剤)
Claims (4)
- 薬物を徐放的に放出するための薬物徐放性ハイドロゲルコンタクトレンズであって、装用開始から4時間程度までの初期放出量が含有される薬剤の総量の50%以下であり且つ少なくとも14時間で、当該薬物徐放性ハイドロゲルコンタクトレンズに含まれる前記薬物の80%以上を放出することを特徴とする薬物徐放性ハイドロゲルコンタクトレンズ。
- 少なくともカチオン性モノマー及びアニオン性モノマーであるイオン性モノマーからなるハイドロゲルであって、
前記イオン性モノマーの構成比率は、前記ゲルを構成するモノマーの総量に対して、5モル%以上20モル%以下であり、
前記カチオン性モノマーに対する前記アニオン性モノマーの含量は、15モル%以上25モル%以下であることを特徴とする請求項1に記載の薬物徐放性ハイドロゲルコンタクトレンズ。 - 少なくとも1つ以上のカルボキシル基を有するアニオン性薬剤を0.5~5.0mg含有することを特徴とする請求項1又は2に記載の薬物徐放性ハイドロゲルコンタクトレンズ。
- 前記アニオン性薬剤は、クロモグリク酸ナトリウム、クロモグリク酸カリウムであることを特徴とする請求項1乃至3のいずれか一項に記載の薬物徐放性ハイドロゲルコンタクトレンズ。
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US13/202,547 US8940318B2 (en) | 2009-02-20 | 2010-01-15 | Hydrogel contact lens for sustained drug release and drug release method using hydrogel contact lens for sustained drug release |
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