US20170087100A1 - Semifluorinated compounds and their compositions - Google Patents

Semifluorinated compounds and their compositions Download PDF

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US20170087100A1
US20170087100A1 US15/280,306 US201615280306A US2017087100A1 US 20170087100 A1 US20170087100 A1 US 20170087100A1 US 201615280306 A US201615280306 A US 201615280306A US 2017087100 A1 US2017087100 A1 US 2017087100A1
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composition
compositions
eye
composition according
condition
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Dieter Scherer
Ralf GRILLENBERGER
Frank LÖSCHER
Hartmut Voss
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Novaliq GmbH
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Novaliq GmbH
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Assigned to NOVALIQ GMBH reassignment NOVALIQ GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SCHERER, DIETER, GRILLENBERGER, RALF, LÖSCHER, Frank, VOSS, HARTMUT
Publication of US20170087100A1 publication Critical patent/US20170087100A1/en
Priority to US16/180,994 priority Critical patent/US10682315B2/en
Priority to US16/874,617 priority patent/US11357738B2/en
Priority to US17/833,836 priority patent/US20220370377A1/en
Abandoned legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/02—Halogenated hydrocarbons
    • 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
    • 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
    • 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
    • A61K9/08—Solutions
    • 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

Definitions

  • the present invention is in the field of compositions comprising semifluorinated compounds and their use in ophthalmic administration.
  • Semifluorinated alkanes are compounds composed of at least one non-fluorinated hydrocarbon segment and at least one perfluorinated hydrocarbon segment.
  • Linear, unbranched semifluorinated alkanes of the general formula CF 3 (CF 2 ) n (CH 2 ) m CH 3 , wherein n and m are integers denoting the number of carbon atoms of the respective segment are described for various applications, for example commercially for unfolding and reapplying a retina, for long-term tamponade as vitreous humour substitute (H. Meinert et al., European Journal of Ophthalmology, Vol. 10(3), pp. 189-197, 2000), and as wash-out solutions for residual silicon oil after vitreo-retinal surgery.
  • WO 2011/073134 discloses solutions of ciclosporin in a semifluorinated alkanes of the formula CF 3 (CF 2 ) n (CH 2 ) m CH 3 , optionally in the presence of a co-solvent such as ethanol, wherein the semifluorinated alkane functions as a liquid drug delivery vehicle for ciclosporin for topical treatment of keratoconjunctivitis sicca.
  • WO2014/041055 describes mixtures of semifluorinated alkanes of the formula CF 3 (CF 2 ) n (CH 2 ) m CH 3 (which may be alternatively expressed as F(CF 2 ) n (CH 2 ) m H). These mixtures are described to be ophthalmically applicable as tear film substitutes or for treating patients with dry eye syndrome and/or meibomian gland dysfunction.
  • FnHm A nomenclature which is frequently used for semifluorinated compounds having linear and unbranched segments is FnHm, wherein F means a perfluorinated hydrocarbon segment, H means a non-fluorinated segment, and n and m define the number of carbon atoms of the respective segment.
  • F3H3 is used for perfluoropropylpropane, CF 3 (CF 2 ) 2 (CH 2 ) 2 CH 3 , i.e. 1-perfluoropropylpropane.
  • the invention relates to a composition comprising CF 3 (CF 2 ) 5 (CH 2 ) 7 CH 3 and CF 3 —(CF 2 ) 5 —CH(CH 3 )—(CH 2 ) 5 —CH 3 .
  • the invention relates to such compositions, comprising at least about 80 wt % of CF 3 (CF 2 ) 5 (CH 2 ) 7 CH 3 , and in another aspect, to such compositions comprising up to about 25 wt % of CF 3 —(CF 2 ) 5 —CH(CH 3 )—(CH 2 ) 5 —CH 3 .
  • the present invention relates to compositions comprising said compounds in the form of clear, liquid solutions.
  • composition comprising CF 3 (CF 2 ) 5 (CH 2 ) 7 CH 3 and CF 3 —(CF 2 ) 5 —CH(CH 3 )—(CH 2 ) 5 —CH 3 for treatment of dry eye disease and/or Meibomian Gland Dysfunction and any symptoms or conditions associated with these conditions.
  • the present invention provides a method for treatment of dry eye disease and/or Meibomian Gland Dysfunction and any symptoms or conditions associated thereof comprising administering said composition topically to the lacrimal sac, into the lower eyelid, to an eye surface or to an ophthalmic tissue.
  • the present invention provides a kit comprising compositions of the present invention held in a container which comprises dispensing means adapted for topical administration of the composition to the eye or ophthalmic tissue.
  • FIG. 1 is a graph depicting the evaporation time of compositions consisting of the compounds CF 3 (CF 2 ) 5 (CH 2 ) 7 CH 3 and CF 3 —(CF 2 ) 5 —CH(CH 3 )—(CH 2 ) 5 —CH 3 as a function of the percentage of the latter compound in the composition.
  • FIG. 2 is a graph depicting the refractive index determined for compositions consisting of the compounds CF 3 (CF 2 ) 5 (CH 2 ) 7 CH 3 and CF 3 —(CF 2 ) 5 —CH(CH 3 )—(CH 2 ) 5 —CH 3 as a function of the percentage of the latter compound in the composition.
  • FIG. 3 is a graph representing results obtained from an Ex vivo Eye Irritation Test (EVEIT) comparison of compositions of CF 3 (CF 2 ) 5 (CH 2 ) 7 CH 3 and CF 3 —(CF 2 ) 5 —CH(CH 3 )—(CH 2 ) 5 —CH 3 , a hyaluronic standard reference and 0.01% BAC positive control.
  • EVEIT Ex vivo Eye Irritation Test
  • the invention relates to a composition
  • a composition comprising CF 3 (CF 2 ) 5 (CH 2 ) 7 CH 3 and CF 3 —(CF 2 ) 5 —CH(CH 3 )—(CH 2 ) 5 —CH 3 .
  • the compound CF 3 —(CF 2 ) 5 —CH(CH 3 )—(CH 2 ) 5 —CH 3 may also be referred to as 2-perfluorohexyloctane, based on the hydrocarbon alkane as the root. This compound features a stereocenter at the 2-alkyl position.
  • the general formula encompasses both enantiomers, enriched mixtures of the two enantiomers, as well as the racemic mixture.
  • the compound CF 3 (CF 2 ) 5 (CH 2 ) 7 CH 3 may alternatively be referred to as 1-perfluorohexyloctane, or F6H8, following the nomenclature FnHm, wherein n is an integer representing the number of carbon atoms of the linear, unbranched perfluorinated segment and m is an integer representing the number of carbon atoms of the linear, unbranched hydrocarbon segment.
  • compositions of the invention are those that comprise at least about 80 wt % of CF 3 (CF 2 ) 5 (CH 2 ) 7 CH 3 .
  • the compositions comprise of at least about 90 wt % or at least about 95 wt % or at least 97 wt % of CF 3 (CF 2 ) 5 (CH 2 ) 7 CH 3 .
  • the compositions comprise up to about 25 wt % of CF 3 —(CF 2 ) 5 —CH(CH 3 )—(CH 2 ) 5 —CH 3 .
  • compositions comprise up to about 10 wt %, or up to about 5 wt % or up to about 3 wt % of the compound CF 3 —(CF 2 ) 5 —CH(CH 3 )—(CH 2 ) 5 —CH 3 .
  • wt % refers to the weight of a component as a percentage fraction of the weight of the composition determined as a whole.
  • the term about preceding a parameter such as wt % includes the precise value as well as any value falling within the degree of variability usually observed in the measurement and determination of the parameter, including standard techniques and equipment known in the art and field.
  • compositions of the invention comprising of about 97 wt % of CF 3 (CF 2 ) 5 (CH 2 ) 7 CH 3 and up to about 3 wt % of CF 3 —(CF 2 ) 5 —CH(CH 3 )—(CH 2 ) 5 —CH 3 .
  • the composition may comprise of about 98 wt % of CF 3 (CF 2 ) 5 (CH 2 ) 7 CH 3 and up to about 1 wt % of CF 3 —(CF 2 ) 5 —CH(CH 3 )—(CH 2 ) 5 —CH 3 .
  • compositions comprising these semifluorinated alkanes as defined above are preferably in the liquid form, and are preferably formulated to be administered as a clear liquid solution.
  • clear means the absence of dispersed solid or liquid particles which cause turbidity.
  • clear solution is a purely monophasic liquid system, except that minor and technically irrelevant amounts of particulate impurities may be present.
  • compositions may be formulated to be administered as a gel, suspension, microemulsion, or a spray.
  • the compositions are provided in sterile form.
  • the composition is preferably formulated as a liquid solution which exhibits a refractive index that is close to that of water which is 1.333 at room temperature (RT).
  • RT room temperature
  • the refractive index of the liquid solutions is in the range of from about 1.30 to about 1.35 at 20° C., as determined by refractometer.
  • compositions as defined above may also comprise further excipients as required or as useful such as one or more acids, bases, electrolytes, buffers, solutes, antioxidants, stabilizers, and if required, preservatives.
  • the compositions as described herein are substantially free of water and/or substantially free of a preservative, such as benzalkonium chloride.
  • the composition as described above is substantially free of the following: (a) a polymer (b) a perfluorinated compound, and/or (c) a dissolved pharmacologically active ingredient which is not a semifluorinated alkane.
  • Such compositions are also preferably formulated as clear liquid solutions.
  • the composition as described in any of the embodiments herein may be substantially free of a pharmacologically active ingredient, in any form and which is not a semifluorinated alkane.
  • composition constituent refers to the presence of said constituent in no more than trace amounts and that if present in trace amounts the constituent provides no technical contribution to the composition.
  • perfluorinated compounds i.e. compounds in which all the hydrogen atoms are replaced with fluorine, and which are preferably absent in the compositions of the invention include perfluoroalkanes such as perfluorodecalin, as well as halogenated perfluoroalkanes such as perfluorooctylbromide.
  • compositions of the invention are also substantially free of a dissolved pharmacological active ingredient which is not a semifluorinated alkane; as used herein, the term “pharmacological active ingredient” refers to any type of pharmaceutically active compound or drug, i.e. one that produces a pharmacological effect and that may accordingly be useful in the prevention, diagnosis, stabilization, treatment, or generally speaking, the management of a condition or disease.
  • the composition according to the present invention essentially consists of CF 3 (CF 2 ) 5 (CH 2 ) 7 CH 3 and CF 3 —(CF 2 ) 5 —CH(CH 3 )—(CH 2 ) 5 —CH 3 .
  • the composition essentially consists of about 97 wt % of CF 3 (CF 2 ) 5 (CH 2 ) 7 CH 3 and up to about 3 wt % of CF 3 —(CF 2 ) 5 —CH(CH 3 )—(CH 2 ) 5 —CH 3 .
  • compositions as defined above are preferably formulated to have a dynamic viscosity of not more than 10 mPa ⁇ s, and preferably not more than 4 mPa ⁇ s, as determined under standard ambient temperature and pressure (25° C., 1 atm).
  • the compositions Preferably, have a dynamic viscosity of between 1 and 4 mPa ⁇ s.
  • the viscosity of the compositions may be determined using any standard viscometer device known in the art, such as a glass tube or capillary viscometer.
  • compositions as described herein may be used in medical applications, in particular for use in ophthalmology, and in particular in the topical administration to the eye, such as to the lacrimal sac, into the lower eyelid, to an eye surface or to any ophthalmic tissue or anatomy associated with the eye that may be made available for topical administration.
  • compositions of the invention are beneficial for use in the treatment of diseases and conditions which would benefit from stabilization of the tear film and tear film lipid layer and lubrication of the eye surface.
  • the compositions of the present invention are especially suited in the treatment of dry eye disease (keratoconjunctivitis sicca) and/or Meibomian Gland Dysfunction (MGD) and any symptoms thereof or associated therewith.
  • Dry eye disease also known as keratoconjunctivitis sicca
  • aqueous deficient dry eye disease can be distinguished into two categories, namely aqueous deficient dry eye disease and evaporative dry eye disease. These conditions are not necessarily mutually exclusive.
  • Aqueous deficient dry eye is typically observed in patients suffering from Sjogren syndrome, or those suffering from a lacrimal gland insufficiency, lacrimal duct obstruction or reflex hyposecretion.
  • Evaporative dry eye disease on the other hand has diverse root causes and is associated with increased/abnormal evaporative loss of the tear film, for example as a result of meibomian gland disorders, eyelid aperture disorders, blinking disorders, or ocular surface disorders.
  • Symptoms of dry eye disease include dry, scratchy, gritty, sandy or foreign body sensations in the eye; pain, soreness, stinging or burning; itching, increased need for blinking, eye fatigue, photophobia, blurry vision, redness and inflammation of the eye tissue, excess mucus discharge and crusting/clotting, contact lens intolerance, and excess reflex tearing.
  • Meibomian Gland Dysfunction refers to a condition where the meibomian glands do not secrete enough oil or when the oily secretions are of poor or abnormal quality. Often, the oil gland openings may become plugged up or obstructed so that less oil is secreted from the glands. The oil is secreted from the glands can be granular (crusty) or otherwise abnormal, and can cause irritation to the eye and eye tissues. In the early stages, patients are often asymptomatic, but if left untreated, MGD can cause or exacerbate dry eye symptoms and eyelid inflammation. The oil glands become blocked with thickened secretions. Chronically clogged glands eventually become unable to secrete oil, which may result in permanent changes in the tear film and dry eyes.
  • Symptoms of Meibomian Gland Dysfunction include dryness, burning, itching, stickiness/crustiness, watering light sensitivity, red eyes, foreign body sensation, chalazion/styes or intermittent blurry vision.
  • compositions of the invention as described above are used for the topical ophthalmic treatment of evaporative dry eye disease and or Meibomian Gland Dysfunction (MGD), and for the treatment or prevention of any one of the symptoms or conditions associated thereof.
  • MMD Meibomian Gland Dysfunction
  • the compositions as described herein may be used as a lubricant of the eye surface, so as to ameliorate one or more of the symptoms associated with dry eye disease and to wet the eye surface.
  • the compounds and compositions thereof as described above are used for the topical ophthalmic treatment of corneal damage.
  • said compounds and compositions are actively supporting the corneal healing process of corneal damage, such as corneal erosions.
  • the treatment of the above described conditions e.g. corneal damage
  • diseases, and their associated symptoms also as described above is preferably carried out by a method of administering to a patient in need thereof, an effective amount of a composition as described above, comprising CF 3 (CF 2 ) 5 (CH 2 ) 7 CH 3 and CF 3 —(CF 2 ) 5 —CH(CH 3 )—(CH 2 ) 5 —CH 3 , for example wherein the composition comprises up to about 25 wt % of CF 3 —(CF 2 ) 5 —CH(CH 3 )—(CH 2 ) 5 —CH 3 .
  • the advantages of the compounds and compositions described above in the context of their use according to the present invention, are believed to relate to their properties which are particularly suited for ophthalmic applications.
  • the close proximity of the refractive indices of the compounds of the invention to that of water, means that there would be no or minimal impact of a patient's vision subsequent to administration, unlike ophthalmic compositions based on oily carriers which can confer blurry vision on administration.
  • the generally low viscosity and low surface tension and in particular their high wetting and spreading capabilities of these compounds also ensures that they are rapidly accommodated and adapted on administration over the surface of the eye.
  • compositions of the invention are biocompatible and exhibit no apparent cytotoxic effects. Moreover, it has been established that these compositions are not only well tolerated in the eye and has no impact on visual acuity, but also provide a beneficial effect in terms of lubrication of the eye and stabilization of the tear film, in the form of relief in symptoms of patients having mild to moderate symptoms associated with dry eye disease. Patients with dry eye disease and/or dysfunctional meibomian glands often express opaque and thicker meibum which can lead to an abnormal lipid layer in the tear film.
  • the physico-chemical attributes of the compounds featured in the compositions of the invention may play a role in stabilizing the lipid layer of the tear film, such as by solubilization of certain lipid components or improving the fluidity of the lipid layer, as well as provide a lubricating effect on the eye
  • the present invention provides a method for treatment of dry eye disease and any symptoms or conditions associated thereof comprising administering the compositions of the present invention topically to the lacrimal sac, into the lower eyelid, to an eye surface or to an ophthalmic tissue.
  • said compositions can be administered to the eye or eye tissue up to four times per day.
  • kits comprising any one of the compositions as described above, and a container for holding said composition.
  • Said container preferably comprises a dispensing means adapted for topical administration of the composition to an eye sac, lower eyelid to an eye or ophthalmic tissue, such as an eye dropper.
  • the dispensing means comprises a dropper of dimensions such as to dispense droplets having a volume of 8 to 15 ⁇ L, preferably of about 8-12 ⁇ l, more preferably of about 10 ⁇ l.
  • a dropper of dimensions such as to dispense droplets having a volume of 8 to 15 ⁇ L, preferably of about 8-12 ⁇ l, more preferably of about 10 ⁇ l.
  • compositions of the invention moreover can be administered to the eye or eye tissue up to four times per day; preferably with one drop (ca. between 8 to 15 ⁇ L in volume) administered per eye, and per dose. Treatment may last up to at least six weeks.
  • the compositions is administered at a dose of 1 drop of about between 8 to 15 ⁇ L volume, preferably of about 10 ⁇ l volume to each eye three to four times per day.
  • the compound CF 3 —(CF 2 ) 5 —CH(CH 3 )—(CH 2 ) 5 —CH 3 may be prepared as follows: radical addition of perfluorohexyl iodide with 1-octene in the presence of a radical initiator (herein perfluorohexyl iodide is mixed with 1-octene and a radical initiator as AIBN and the obtained solution is maintained at 80° C. for 30 min and cooled down), followed by reduction of the resulting iodo adduct with hydride (i.e. LiALH4) or via hydrogenation (i.e. catalytic hydrogenation in presence of a catalyst such as Pd/C) to form 2-perfluorohexyl-octane, followed by purification by fractional distillation.
  • a radical initiator herein perfluorohexyl iodide is mixed with 1-octene and a radical initiator as AIBN and the obtained solution is maintained at 80° C
  • the cytotoxicity of a composition comprising 1.3 wt % CF 3 —(CF 2 ) 5 —CH(CH 3 )—(CH 2 ) 5 —CH 3 and 95.8 wt % CF 3 (CF 2 ) 5 (CH 2 ) 7 CH 3 was assessed by a cell growth inhibition test which predicts cytotoxic or necrotic effects with good correlation to animal experiments and high sensitivity.
  • composition was extracted by cell culture medium (DMEM supplemented with 10% FBS) under agitation for ⁇ 24 hours.
  • the resulting extract was then incubated with mouse cell line L929 cells for 68-72 hours, before the protein content was analyzed using a BCA (bicinchoninic acid) test as a measure for cytotoxicity. No inhibition of cell growth or cell lysis was observed.
  • An analogous in vitro cytotoxicity assay is conducted for a composition comprising about 23.7 wt % CF 3 —(CF 2 ) 5 —CH(CH 3 )—(CH 2 ) 5 —CH 3 and about 75.6 wt % F6H8.
  • a composition comprising 98.3 wt % of CF 3 (CF 2 ) 5 (CH 2 ) 7 CH 3 and 1.2 wt % of CF 3 —(CF 2 ) 5 —CH(CH 3 )—(CH 2 ) 5 —CH 3 was tested in an observational study in patients with mild to moderate evaporative dry eye disease.
  • the clear colorless liquid composition was provided in a 5 ml bottle equipped with a dropper dimensioned to dispense of droplets of ⁇ 10 ⁇ l per drop into the eye sac.
  • Patients wearing contact lenses were excluded from the study. After informed consent had been obtained, patients were advised to apply 3-4 drops, daily in both eyes, translating to a daily dose of 30-40 ⁇ l.
  • Clinical data for 29 patients were collected at baseline and at the 5-7 week follow-up visit.
  • Tear film fluid and tear film stability improved over the study period, as can be seen in the increase in Schirmer I and the TFBUT.
  • the subjective dry eye questionnaire (Ocular Surface Disease Index, OSDI) revealed that patient's subjective symptom severity decreased after the use of the composition comprising 98.3 wt % of CF 3 (CF 2 ) 5 (CH 2 ) 7 CH 3 and 1.2 wt % of CF 3 —(CF 2 ) 5 —CH(CH 3 )—(CH 2 ) 5 —CH 3 over a 5-7 week period, as can be seen in the lower scores at follow-up and the retrospective statistical analysis (paired two sided t-test: p ⁇ 0.0001).
  • meibum is secreted from the meibomian glands as a clear liquid. More opaque and thicker meibum is an indicator of dysfunctioning meibomian glands. Patients' meibum was descriptively examined at both the baseline and the follow-up visit. According to the data obtained, meibum quality improved in a number of cases. In seven cases, the treatment induced a reduction of expressible meibum (changing from clear meibum to none).
  • composition comprising 98.3 wt % of CF 3 (CF 2 ) 5 (CH 2 ) 7 CH 3 and 1.2 wt-% of CF 3 —(CF 2 ) 5 —CH(CH 3 )—(CH 2 ) 5 —CH 3 over 5-7 weeks is safe and does not interfere with these ophthalmological parameters.
  • DSC Differential Scanning calorimetry
  • the refractive index of the mixtures was also determined.
  • the refractive index of the composition should preferably similar, or adapted to that of the eye and lens, for instance as close to that of physiological tear fluid as possible. If the refractive index of a composition is not similar, when applied to the surface of the eye, a patient may experience blurring or impaired vision. It is observed, that the amount of the semifluorinated alkane CF 3 (CF 2 ) 5 —CH(CH 3 )—(CH 2 ) 5 —CH 3 has an effect on refractive index (see FIG. 2 , which depicts an increasing refractive index value with increased content of the 2-perfluorohexyloctane).
  • this semifluorinated alkane in the mixture may also be feasible to adapt the composition to the requirements of the intended ophthalmic use, for instance adapting to a patient with an altered tear fluid composition and refractive index, due to an eye condition and/or age.
  • compositions comprising CF 3 (CF 2 ) 5 (CH 2 ) 7 CH 3 , namely compositions consisting of a mixture of the semifluorinated alkane CF 3 (CF 2 ) 5 (CH 2 ) 7 CH 3 and CF 3 (CF 2 ) 5 —CH(CH 3 )—(CH 2 ) 5 —CH 3
  • Composition A with 0.17 wt % of CF 3 (CF 2 ) 5 —CH(CH 3 )—(CH 2 ) 5 —CH 3
  • Composition B with 64 wt % of CF 3 (CF 2 ) 5 —CH(CH 3 )—(CH 2 ) 5 —CH 3
  • HYLO-COMOD® hyaluronic acid
  • BAC benzalkonium chloride
  • Rabbit corneas were obtained and placed in an artificial anterior ocular chamber which was gently filled with serum-free minimal essential medium (Eagle's MEM) containing Earle's salts and HEPES buffer for nutrition. The medium was contstantly replenished by a micropump to imitate the physiological condition of the eye.
  • the corneas were evaluated by microscopy and corneas with intact epithelium and without opacities were selected.
  • Four small abrasions (2.3-4.3 mm 2 ) were applied to the surface of the selected corneas with a cornea drill. All defects were monitored by fluorescein sodium staining (0.17% aq. solution) and microscopy.
  • test substances were administered one hour after induction of the corneal erosion and were applied six times daily onto the apex of the corneas (30-50 ⁇ L every four hours).
  • a soft-tipped cannula, with continuous suction was placed on the lowest part of the corneoscleral region within the culturing chamber to remove any excess fluid.
  • Experiments were terminated after 3 days of application.
  • Biomicroscopic images of the corneas were taken daily to document the corneal healing process using a phase-contrast microscope integrated camera (KY-F1030U, JVC, (Bad Vilbel, DE) mounted on a Z16 APO Microscope (Wetzlar, DE)). All defects were monitored by fluorescein sodium stains (0.17% aq.
  • Descemet membrane and endothelial layer are present without any defects in structure. 0.01% BAC Severe alterations of the superficial cornea with disintegration of (positive whole corneal structures; observation of distinct edema control) Reduced staining of background substance indicating chemical alteration of collagen Severe reduction in number of keratocyte cells which also appear rounded and pycnotic. Descemet membrane is present with intact endothelium
  • composition B comprising 64 wt %, based on total weight of the composition of semifluorinated alkane CF 3 (CF 2 ) 5 —CH(CH 3 )—(CH 2 ) 5 —CH 3 and composition A.
  • the mechanically induced epithelial erosions were found to be significantly reduced and essentially absent after day 2 of treatment.
  • FIG. 3 depicts the corneal erosion size measurements of the tested compositions, reference and positive controls for days 0-3 of the EVEIT experiment.
  • the positive control comprising 0.01% of the preservative BAC, a progressive increase of the induced epithelial lesions was observed over the course of the three days of the experiment.

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