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(12) Patent Application Publication (10) Pub. No.: US 2005/0074497 A1 Schultz (43) Pub

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(12) Patent Application Publication (10) Pub. No.: US 2005/0074497 A1 Schultz (43) Pub US 2005OO74497A1 (19) United States (12) Patent Application Publication (10) Pub. No.: US 2005/0074497 A1 Schultz (43) Pub. Date: Apr. 7, 2005 (54) HYDROGELS USED TO DELIVER Publication Classification MEDICAMENTS TO THE EYE FOR THE TREATMENT OF POSTERIOR SEGMENT (51) Int. Cl." ....................... A61K 39/395; A61K 38/24; DISEASES A61K 31/65; A61K 9/14; A61K 31/56; A61K 31/075 (76) Inventor: Clyde L. Schultz, Ponte Vedra, FL (52) U.S. Cl. ........... 424/486; 514/8; 514/12; 424/144.1; (US) 514/182; 514/721; 514/152 Correspondence Address: CLARK & ELBING LLP (57) ABSTRACT 101 FEDERAL STREET This invention provides a polymeric drug delivery System BOSTON, MA 02110 (US) including a hydrogel containing one or more drugs for the treatment of a posterior Segment disease. Exemplary drugs (21) Appl. No.: 10/971,997 are anti-angiogenesis compounds for the treatment of macu (22) Filed: Oct. 22, 2004 lar degeneration. Allowing passive transference of this drug from a dilute Solution into the hydrogel produces the deliv Related U.S. Application Data ery System. The hydrogel, when placed in contact with the eye, delivers the drug. The delivery of the drug is Sustained (63) Continuation-in-part of application No. 10/821,718, over an extended period of time, which is of particular utility filed on Apr. 9, 2004. in the eye, which is periodically flushed with tears. This Sustained delivery accelerates the treatment process while (60) Provisional application No. 60/461,354, filed on Apr. avoiding potential damaging effects of localized delivery of 9, 2003. high concentrations of compounds, e.g., from eye drops. US 2005/0074497 A1 Apr. 7, 2005 HYDROGELS USED TO DELIVER correcting vision. Such a contact lens may be capable of MEDICAMENTS TO THE EYE FOR THE correcting vision in the range of +8.0 to -8.0 diopters or may TREATMENT OF POSTERIOR SEGMENT be plano. The contact lens may also have a base curve DISEASES between 8.0 and 9.0. 0007. The invention further features a method for making CROSS-REFERENCE TO RELATED a hydrogel drug delivery System by placing the hydrogel, APPLICATIONS e.g., a contact lens, in a Solution containing one or more 0001. This application is a continuation-in-part of U.S. drugs as described herein, which is passively transferred to application Ser. No. 10/821,718, filed Apr. 9, 2004, which the hydrogel. This method may further include the steps of claims benefit of U.S. Provisional Application No. 60/461, Washing the hydrogel in an isotonic Saline Solution and 354, filed Apr. 9, 2003, each of which is hereby incorporated partially desiccating the hydrogel prior to placement in the by reference. Solution. The Solution may have, e.g., a pH between 6.9 and 7.4, and a drug concentration of between 0.00001 and 10%. BACKGROUND OF THE INVENTION In one embodiment, the hydrogel is placed in the Solution of drug for at least 30 minutes. 0002. In general, the invention relates to the fields of hydrogels, drug delivery Systems, and treatment of posterior 0008. In another aspect, the invention features a method Segment diseases. for treating a posterior Segment disease. The method includes placing a hydrogel, as described herein, in contact 0003) Systemic and topical (e.g., via eye drops) admin with an eye, wherein the drug or drugs are passively released istration of drugs for treatment of diseases of the posterior from the hydrogel to treat the disease. In various embodi Segment of the eye, Such as macular degeneration, is often ments, the posterior Segment disease is in the Vitreous, retina undesirable. These methods typically require higher total (e.g., the macula), choroids, Sclera, or optic nerve. The doses of the drug because these routes are inefficient at hydrogel may passively release, for example, at least 0.0001, delivering the drug to the posterior Segment. Such high 0.0005, 0.001, 0.005, 0.01, 0.05, 0.1, 0.5, 1, 10, 15, 20, 50, doses increase the cost and may also cause Side effects Such 75, 100, 250, 500, or 1000 tug of a drug, and the hydrogel as local inflammation or adverse Systemic reactions. In may be placed in contact with the eye for at least 0.5, 1, 1.5, addition, for most topical treatments, the drug is quickly 2, 2.5, 3, 3.5, 4, 4.5, 5, 7.5, 10, 15, or 24 hours. The method washed out of the eye, limiting the effective time of treat for treating a posterior Segment disease, e.g., macular degen ment. eration, may further include the Step of diagnosing the 0004 Thus, Sustained-release delivery devices that con posterior Segment disease prior to placing the hydrogel in tinuously administer a drug to the eye for a prolonged period contact with the eye. of time are desired for the treatment of posterior Segment 0009 Exemplary drugs and posterior segment diseases diseases. are described herein. Preferred drugs include anti-angiogen esis compounds, as described herein, for the treatment of SUMMARY OF THE INVENTION macular degeneration. 0005 The present invention features hydrogel drug deliv 0010. As used herein, by “ambient conditions” is meant ery Systems and methods of producing and using Such room temperature and pressure. Systems for the treatment of disease in the posterior Segment of the eye, e.g., the vitreous, retina (including the macula), 0011. By “existing conditions” is meant in situ in the eye. choroids, Sclera, and optic nerve. The Systems are based on 0012. By “treating” is meant medically managing a a hydrogel into which one or more drugs are passively patient with the intent that a prevention, cure, Stabilization, transferred from a dilute Solution, e.g., an aqueous Solution. or amelioration of the symptoms will result. This term When placed in contact with eye tissue, the drug or drugs includes active treatment, that is, treatment directed Specifi passively transfer out of the hydrogel to provide treatment of cally toward improvement of the disease; palliative treat posterior Segment diseases. ment, that is, treatment designed for the relief of Symptoms 0006 Accordingly, in one aspect, the invention features a rather than the curing of the disease; preventive treatment, polymeric hydrogel that contains a drug for the treatment of that is, treatment directed to prevention of the disease; and a posterior Segment disease, wherein the drug is capable of Supportive treatment, that is, treatment employed to Supple being passively released in a therapeutically effective ment another Specific therapy directed toward the improve amount to treat the posterior Segment disease. Exemplary ment of the disease. The term “treating” also includes hydrogel materials include a tetrapolymer of hydroxymeth Symptomatic treatment, that is, treatment directed toward ylmethacrylate, ethylene glycol, dimethylmethacrylate, and constitutional Symptoms of the disease. methacrylic acid. Other examples of hydrogels include eta 0013 By “ocular environment” is meant the tissues of filcon A, vifilcon A, lidofilcon A, vaSurfilcon A, and poly and Surrounding the eye, including, for example, the Sclera, macon B. In addition, variations of these polymers formed cornea, and other tissues of the ocular cavity and the by the use of different packing Solutions (e.g., phosphate posterior Segment. buffered Saline and boric acid) in the manufacturing process are also included. The hydrogel may be ionic or non-ionic. 0014. The “posterior segment” of the eye includes, with In various embodiments, the drug is capable of being out limitation, the vitreous, retina (including the macula), passively released into the ocular environment under ambi choroids, Sclera, and optic nerve. ent or existing conditions. In other embodiments, the hydro 0015 Exemplary posterior segment diseases include, gel may be shaped as a contact lens, e.g., one capable of without limitation, retinal detachment, diabetic retinopathy, US 2005/0074497 A1 Apr. 7, 2005 macular degeneration (e.g., age-related), proliferative Vit of diopters of +8.0 to -8.0. Exemplary hydrogel contact lens reoretinopathy, endophthalmitis, retinopathy of prematurity, materials include etafilcon A, vifilcon A, lidofilcon A, poly posterior Segment trauma, intraocular lens-related posterior macon B, Vasurfilcon A, and a tetrapolymer of hydroxym Segment complications, retinal vascular diseases, macular ethylmethacrylate, ethylene glycol, dimethylmethacrylate, edema, intraocular tumors, hereditary retinal degenerations, and methacrylic acid. These materials may also be employed AIDS-related retinitis, posterior Segment uveitis, and SyS in other physical forms. Other Suitable hydrogel materials temic diseases with retinal manifestations. For the purposes are known to those skilled in the art. The hydrogels may be of this invention, glaucoma is not a posterior Segment insoluble, may absorbable (e.g., dissolve or degrade) over disease. time in Vivo, e.g., Over one day, one week, one month, Six months, or one year or more, or may be partially Soluble and 0016 All percentages described in the present invention partially insoluble. The drug is passively delivered, for are by weight unless otherwise Specified. example, by diffusion out of the hydrogel, by desorption 0.017. Other features and advantages of the invention will from the hydrogel, or by release as the hydrogel dissolves. be apparent from the following description and the claims. Exemplary Soluble materials include a copolymer of trim ethylene carbonate and polyglycolicacid (e.g., Maxon), DETAILED DESCRIPTION OF THE polyglactin 910 (e.g., Vicryl), glyconate (e.g., MonoSyn), INVENTION poly-p-dioxanone (e.g., Monoplus), polyglycolic acid (e.g., Safil), polyglycolic acid felt (e.g., NeoVeil), poly-4-hydroxy 0.018. This invention provides a polymeric drug delivery butyrate, combinations of poly(L-lactide) and poly(L-lac System including a hydrogel containing one or more drugs tide-co-glycolide), glycol methacrylate, poly-DL-lactide, for the treatment of a posterior Segment disease. Allowing and Primacryl (Johnson & Johnson, e.g., Craniosorb AFS).
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