|Publication number||US3884826 A|
|Publication date||May 20, 1975|
|Filing date||Jul 20, 1973|
|Priority date||Jul 20, 1973|
|Publication number||US 3884826 A, US 3884826A, US-A-3884826, US3884826 A, US3884826A|
|Inventors||Jr Russell E Phares, Rebecca F Nite|
|Original Assignee||Barnes Hind Pharm Inc|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (7), Referenced by (59), Classifications (27)|
|External Links: USPTO, USPTO Assignment, Espacenet|
United States Patent [191 Phares, Jr. et al.
[451 May 20, 1975 THIXOTROPIC CLEANING AGENT FOR HARD CONTACT LENSES  inventors: Russell E. Phares, Jr., San Jose;
Rebecca F. Nite, Sunnyvale, both of Calif.
 Assignee: Barnes-Hind Pharmaceuticals, Inc., Sunnyvale, Calif.
22 Filed: July 20,1973
21 App]. No.: 381,179
 U.S. Cl. 252/106; 252/89; 252/352; 252/D1G. 1; 252/D1G. 2; 424/78; 424/81  Int. Cl ..C1ld 3/48  Field of Search 252/106, 352, 89, DIG. 2, 252/DIG. 1; 424/78, 81
 References Cited UNITED STATES PATENTS 7/1967 Hernandez 252/90 OTHER PUBLICATIONS Carbopol 934, Servicepp. pgs. 1,20, 21 and 25 (l960), B. F. Goodrich Chemical Company.
Primary ExaminerBenjamin R. Padgett- Assistant ExaminerE. A. Miller  ABSTRACT A thixotropic gel cleaner is provided for hard contact lenses. The cleaning agent is ordinarily packaged in a tube which makes it easy to carry without danger of leakage and it is convenient and effective to use.
8 Claims, N0 Drawings THIXOTROPIC CLEANING AGENT FOR HARD CONTACT LENSES SUMMARY OF THE INVENTION The necessity of cleaning hard contact lenses has been long recognized, and many agents and mechanical devices have been proposed for this purpose.
Contact lens residue can very well come from the healthy eye secretions. Tear fluid has 1.8% total solids consisting of sugars, lipids, salts, mucopolysaccharides, organic acids, enzymes and proteins. Although most of these are water soluble, others are not and are dispersed as colloids and others, such as meibomian oil,
are not at all water soluble. Many of these substances tenaciously adhere to a lens and require a cleaner to be removed. Mucus overproduction that is caused by improperly fitted lenses, infection and irritation due to ailergens in the environment, also contribute to the deposit on the lens.
The patients own fingers are a major source of contact lens soil. While handling the lens, a patient may be transferring perspiration, sebum, nicotine, hand lotions, mascara and other cosmetics from his hands to his lenses.
Even the air is a source of soil. Smog, smoke, and various sprays with all their differently charged particles can easily deposit on the lens surface.
Since it is not easy to avoid getting this residue, cleaning of lenses to prevent this build-up and the possible danger and discomfort due to it should be religiously practised.
Among the materials and methods that have been employed, the following may be mentioned:
1. Strong alkaline or corrosive chemicals that may prove irritating to patients if not completely removed, or that may attack lens material and reduce clarity.
2. Mechanical cleaning, perhaps with the aid of a hard bristle toothbrush and an abrasive tooth powder. Since these abrasives scratch the soft plastic surface of the lens, they are always contraindicated.
3. Solvents, such as lighter and dry cleaning fluids. Many of the low boiling point solvent components of lighter fluid and cleaning compositions do clean. Unfortunately, they contain residual amounts of higher boiling point petroleum derivatives that stay on the lens surface. The result is an even more devastating form of foreign matter.
Such agents have not been uniformly successful in the past, and if the lenses are not properly cleaned, a residue will be left on the lens, resulting in irritation to the wearer and, in extreme cases, poor vision. In addition, this build up of the residue may inhibit wetting activity and trapped bacteria, thus preventing any soaking solution which might be used from exerting antibacterial effects.
There are many products, other than cleaners, that contact lens wearers might be using such as a wetting solution, sterilizing and hydrating solution, artificial tear, decongestant or cushioning preparation. Some of these products are intended for use in the eye but others should be used only outside the eye. Cleaners for contact lenses are generally designed for use outside the eye but recently a cleaner that works in the eye has been marketed. A contact lens cleaner that is to be used outside the eye can easily be confused with a solution designed for use in the eye, especially if the cleaner is also asolution and the patient is not wearing his lenses.
In accordance with the present invention, a cleaner is provided in the form of a thixotropic gel. Although cleaners in gel form have been proposed in the past, they have not been thixotropic and, ordinarily in use, they are too thick to be effective since it is well established that a minimum viscosity enhances cleaning ability. The gel of the present invention combines the advantages of a semi-solid material with those of a liquid material.
Since the material is in the form of a gel, it can ordinarily be packaged in a tube, which makes it much eas-- ier to carry in a purse or pocket and there is little danger of leaking, even if the tube is stored on its side or upside down.
In gel form, it is easy for a user to squeeze out just the right amount of cleansing agent without wasteful and messy dripping.
A further advantage of the gel is that there is no mistaking the cleaning agent for other agents which are normally used with hard contact lenses, such as wetting or soaking solutions. Since many users of contact lenses have poor visual accuity, there is no mistaking the cleaning agent for other agents which are used in the form of liquids even if the user has neglected to read the label on the container.
A further advantage of the thixotropic gel is that it gives the patient something substantial to work on and he can feel the cleaner in contact with thesurface of his lens and will ordinarily do a' more thorough cleaning of the lens than with a liquid. I
The thixotropic gelof the pres'entinvention is a very effective cleaner for contact lenses. It has been tested and found effective for a number of soilants on hard contact lenses such as mascara, oils, marker pen and most hair sprays. It is even effective for removing lipstick, hand cream and black china marker.
Not only does the cleaner of the present invention provide effective cleaning of the lens surface, but it promotes better wetting when the lens is subsequently stored in a wetting solution or wetted with wetting solution prior to insertionin the eye. Even if the cleaner is rinsed off the lens after cleaning, enough of the cleaner is retained on the lens to render the surface more easily wetted by wetting agents than lenses that have been cleaned only with water or conventional cleaning solutrons.
DESCRIPTION OF THE PREFERRED EMBODIMENTS In the simplest form, the formulation of the present invention merely consists of a thixotropic solution of a gelling agent, together with a small amount of cleansing agent. The gelling agent is used in sufficient amount to render the cleaner thixotropic and to give a suitable viscosity. A suitable viscosity range has been found to be 15,000 to 70,000 cps and it is preferred that the viscosity be about 30,000 to 50,000 cps (Brookfield RVF microviscometer spindle 6 at 20 RPM at 25C). If the product is too fluid, it will usually run off the finger before rubbing and would be wasteful, since it would be difficult for the patient to regulate the amount being dispensed from the container. On the other hand, too stiff a gel is not easily spread on the lens surface and might be tacky and not easily rinsed off. Since the gel of the present invention is thixotropic, a stiffer gel may be employed than for gel cleaners which have been proposed in the past which are not thixotropic.
Various gelling agents may be employed such as high molecular weight'carboxyvinyl polymers sold under the trade name Carbopol by B. F. Goodrich Company. Concentrations of from 0.1 to 5% yield a suitable viscosity as defined above. Other typical thixotropic gelling agents, including inorganic clays, are hectorite (solid under such names as Ben-a-Gel and Macaloid), montmorillonite (bentonite), synthetic hectorite (such as that sold under the name of Laponite), and combinations of these such as hectorite with montmorillonite (sold under the name of Veegum), and hectorite with a hydrocolloid such as hydroxyethylcellulose (sold under the name Bentone). Other examples of thixotropic gelling agents are the colloidal or fibrous aluminas such as sold under the trade names of Dispal, Alon and Baymal.
In addition to the gelling agent, the agent will contain a cleaner and preferably a nonionic cleaner is used such as the polyoxyethylene fatty acids esters and alcohol ethers sold under the trade names of Tweens, Spans, Myrij and Brij; oxyethylene oxypropylene polymers (Pluronics) and alkylaryl oxyethylene polymers (Triton). In addition, anionics such as sodium lauryl sulfate can be employed. The cleaning agent may be present in a concentration of from 0.01 to 20% and preferably 0.05 to 5%.
Since the composition of the present invention is not designed to be placed in the eye, ordinarily the lenses should be washed and preferably soaked and treated with a wetting solution before insertion in the eye. For this reason, the detergents used in the cleaning agent can be considerably more concentrated and fasteracting than cleaning agents which are used in solutions which might be placed on the lens directly before insertion in the eye.
The cleaning agent of the present invention is not intended for use in the eye, and, thus, it is not designed to be a sterile product. However, it is ordinarily preferred to include a preservative so that should the cleaning agent become contaminated, it would resterilize itself. For this purpose the organic mercury compounds such as thimerosol and phenylmercuric acetate, and other sterilizing agents such as methyl paraben, propyl paraben, phenylethyl alcohol and chlorobutanol are entirely suitable for this purpose. Concentrations of from 0.001 to 1.0 may be employed if it is desired to employ a preservative.
The following non-limiting examples illustrate the preferred embodiments of the invention:
-Continued Example 111 Polyoxyethylene fatty acid ester 1% Thimerosal 0.01% Purified Water q.s.
Example IV Laponite XLG 3% Sodium Sulfate 0.15% Sodium lauryl sulfate 0.1% Thimerosal 0.01% Purified Water q.s. 100% Example V Laponite CP 4% Calcium Chloride 0.04% Polyoxyethylene fatty alcohol ether 1% Chlorobutanol 0.5% Purified Water q.s. 100% Example VI Laponite CP 3% Aluminum chloride 0.045% Polyoxyethylene fatty acid ester 0.5% Methyl paraben 0.15% Purified Water q.s. 100% Example V11 Carbopol 940 0.5% Thimerosal 0.004% Polyoxyethylene alkylaryl ether 0.5% Sodium Hydroxide to'pH 8 Purified Water q.s.
(a) Carboxyvinyl polymer from B.F. Goodrich (1!) Sodium Ethylmercurithiosalicylatc (c) Polyoxethylene polyoxypropylene polyoxyethlene glycol from Wyandottc Chemicals (d) Synthetic montmorillonite All percentages are by weight.
1. An aqueous thixotropic composition for cleaning hard contact lenses consisting essentially of:
from 0.1 to 20 weight percent of an anionic or nonionic detergent;
from 0.1 to 5 weight percent and in an amount sufficient to form a gel of a thixotropic gelling agent; from 0.001 to 1 weight percent of a sterilizing agent,
2. A composition according to claim 1, wherein said thickening agent is synthetic montmorillonite in an amount of from about 1 to 5 weight percent and said detergent is nonionic.
3. A composition according to claim 1, wherein said thickening agent is a high molecular weight carboxyvinyl polymer in an amount of from about 0.2 to 2 weight percent and said detergent is nonionic 4. A composition according to claim 3, wherein said sterilizing agent is thimerosal.
5. A composition according to claim 1, wherein said composition has a viscosity of 15,000 to 70,000 cps at 25C.
6. A composition according to claim 1, wherein said thickening agent is carboxyvinyl polymer in the amount of from about 0.5 weight percent, said detergent is polyoxyethylene alkylaryl ether in an amount from about 0.5 weight percent, said sterilizing agent is thimerosal, and the pH of said composition is about 8.
7. A method for cleaning hard contact lenses which comprises:
6 contacting a hard contact lens with a sufficient amount of an aqueous composition according to claim 6, to remove undesirable residue; and
rinsing said hard contact lens.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US3330730 *||Aug 3, 1962||Jul 11, 1967||Colgate Palmolive Co||Pressurized emulsion quick breaking foam compositions|
|US3354088 *||Sep 16, 1963||Nov 21, 1967||Gen Mills Inc||Aerosol hard surface cleaner|
|US3549542 *||Oct 2, 1967||Dec 22, 1970||Procter & Gamble||Process for preparing liquid detergent|
|US3639576 *||Jun 19, 1968||Feb 1, 1972||Barnes Hind Pharm Inc||Resterilizing contact lens solution|
|US3655579 *||Sep 18, 1970||Apr 11, 1972||Chemed Corp||Powder gelling composition|
|US3702303 *||Sep 15, 1970||Nov 7, 1972||Xerox Corp||Cleaning of photoconductive insulating surfaces|
|US3767788 *||Jun 8, 1970||Oct 23, 1973||Burton Parsons Chemicals Inc||Ophthalmic solution|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US3998973 *||Apr 7, 1975||Dec 21, 1976||R. T. Vanderbilt Company, Inc.||Thickening composition|
|US4046706 *||Apr 6, 1976||Sep 6, 1977||Flow Pharmaceuticals, Inc.||Contact lens cleaning composition|
|US4051056 *||Sep 4, 1975||Sep 27, 1977||The Procter & Gamble Company||Abrasive scouring compositions|
|US4100271 *||Feb 26, 1976||Jul 11, 1978||Cooper Laboratories, Inc.||Clear, water-miscible, liquid pharmaceutical vehicles and compositions which gel at body temperature for drug delivery to mucous membranes|
|US4188373 *||Nov 18, 1977||Feb 12, 1980||Cooper Laboratories, Inc.||Clear, water-miscible, liquid pharmaceutical vehicles and compositions which gel at body temperature for drug delivery to mucous membranes|
|US4228048 *||May 25, 1979||Oct 14, 1980||Chemed Corporation||Foam cleaner for food plants|
|US4259202 *||Jun 4, 1979||Mar 31, 1981||Toyo Contact Lens Co., Ltd.||Cleaning and preservative solution for contact lenses|
|US4354952 *||Mar 12, 1981||Oct 19, 1982||Bausch & Lomb Incorporated||Contact lens disinfecting and preserving solution comprising chlorhexidine and salts thereof|
|US4374745 *||Aug 13, 1981||Feb 22, 1983||Barnes-Hind Pharmaceuticals, Inc.||Cleaning compositions|
|US4394179 *||Oct 15, 1980||Jul 19, 1983||Polymer Technology Corporation||Abrasive-containing contact lens cleaning materials|
|US4397755 *||Oct 15, 1981||Aug 9, 1983||Lever Brothers Company||Stable liquid detergent suspensions|
|US4414127 *||Jul 6, 1981||Nov 8, 1983||Syntex (U.S.A.) Inc.||Contact lens cleaning solutions|
|US4474751 *||May 16, 1983||Oct 2, 1984||Merck & Co., Inc.||Ophthalmic drug delivery system utilizing thermosetting gels|
|US4474752 *||May 16, 1983||Oct 2, 1984||Merck & Co., Inc.||Drug delivery system utilizing thermosetting gels|
|US4474753 *||May 16, 1983||Oct 2, 1984||Merck & Co., Inc.||Topical drug delivery system utilizing thermosetting gels|
|US4485029 *||Mar 19, 1984||Nov 27, 1984||Minnesota Mining And Manufacturing Company||Disinfecting method and compositions|
|US4493783 *||Feb 28, 1983||Jan 15, 1985||Alcon Laboratories, Inc.||Cleaning agent for optical surfaces|
|US4500441 *||Mar 9, 1984||Feb 19, 1985||Toyo Contact Lens Co., Ltd.||Contact lens cleaning and storage composition|
|US4534878 *||Jan 6, 1983||Aug 13, 1985||Polymer Technology Corporation||Abrasive-containing contact lens cleaning materials|
|US4588444 *||Apr 4, 1984||May 13, 1986||Anderson Ronald L||Method for cleaning polymeric contact lenses|
|US4613379 *||Oct 19, 1984||Sep 23, 1986||Alcon Laboratories, Inc.||Cleaning agent for optical surfaces|
|US4663233 *||Oct 24, 1985||May 5, 1987||Universal High Technologies||Lens with hydrophilic coating|
|US4670060 *||May 1, 1986||Jun 2, 1987||Alcon Laboratories, Inc.||Cleaning agent for optical surfaces|
|US4792414 *||May 4, 1987||Dec 20, 1988||Alcon Laboratories, Inc.||Cleaning agent for optical surfaces|
|US4801475 *||Aug 23, 1984||Jan 31, 1989||Gregory Halpern||Method of hydrophilic coating of plastics|
|US4820352 *||Jan 22, 1986||Apr 11, 1989||Bausch & Lomb Incorporated||Cleaning and conditioning solutions for contact lenses and methods of use|
|US4830783 *||May 4, 1987||May 16, 1989||Polymer Technology, Corp||Abravise-containing contact lens cleaning materials|
|US4842757 *||Jan 21, 1988||Jun 27, 1989||The Clorox Company||Thickened liquid, improved stability abrasive cleanser|
|US5023114 *||May 2, 1990||Jun 11, 1991||Gregory Halpern||Method of hydrophilic coating of plastics|
|US5037484 *||Dec 5, 1989||Aug 6, 1991||Alcon Laboratories, Inc.||Cleaning agent for optical surfaces|
|US5057241 *||Nov 16, 1988||Oct 15, 1991||S. C. Johnson & Son, Inc.||Dual polymer self-sealing detergent compositions and methods|
|US5089053 *||Nov 9, 1989||Feb 18, 1992||Polymer Technology Corporation||Contact lens cleaning material and method|
|US5190594 *||Oct 7, 1991||Mar 2, 1993||Polymer Technology Corporation||Contact lens cleaning material and method|
|US5298181 *||Dec 12, 1991||Mar 29, 1994||The Clorox Company||Thickened pourable aqueous abrasive cleanser|
|US5376297 *||Feb 22, 1993||Dec 27, 1994||The Clorox Company||Thickened pourable aqueous cleaner|
|US5458873 *||Dec 7, 1992||Oct 17, 1995||Santen Pharmaceutical Co., Ltd.||Carboxyvinyl polymer having Newtonian viscosity|
|US6177480 *||Mar 23, 1999||Jan 23, 2001||Menicon Co., Ltd.||Agent for contact lenses|
|US6316506||Jan 18, 2001||Nov 13, 2001||Alcon Laboratories, Inc.||Conditioning solutions for contact lens care|
|US6486215||Jun 18, 2001||Nov 26, 2002||Alcon Manufacturing, Ltd.||Solutions for treating contact lenses|
|US6511949 *||Aug 3, 1998||Jan 28, 2003||Rohto Pharmaceutical Co., Ltd.||Ophthalmic composition with regulated viscosity|
|US6784149 *||Dec 12, 2001||Aug 31, 2004||Clariant Gmbh||Laundry detergents and cleaners comprising microdisperse silicate-containing particles|
|US8097270 *||Dec 20, 2002||Jan 17, 2012||Novartis Ag||Use of nanoparticles as carriers for biocides in ophthalmic compositions|
|US8257745||Jul 19, 2011||Sep 4, 2012||Novartis Ag||Use of synthetic inorganic nanoparticles as carriers for ophthalmic and otic drugs|
|US9308199||Mar 15, 2006||Apr 12, 2016||Honeywell International Inc.||Medicament formulations|
|US20020111287 *||Dec 12, 2001||Aug 15, 2002||Clariant Gmbh||Laundry detergents and cleaners comprising microdisperse silicate-containing particles|
|US20040115160 *||Apr 11, 2003||Jun 17, 2004||Salamone Joseph C.||Quaternary ammonium esters for disinfection and preservation|
|US20040241206 *||Dec 20, 2002||Dec 2, 2004||Ketelson Howard Allen||Use of nanoparticles as carriers for biocides in ophthalmic compositions|
|US20050002970 *||Dec 20, 2002||Jan 6, 2005||Ketelson Howard Allen||Inorganic nanopartices to modify the viscosity and physical properties of ophthalmic and otic compositions|
|US20050003014 *||Dec 20, 2002||Jan 6, 2005||Ketelson Howard Allen||Use of synthetic inorganic nanoparticles as carriers for ophthalmic and otic drugs|
|US20060269484 *||Mar 15, 2006||Nov 30, 2006||Honeywell International Inc.||Medicament formulations|
|DE3021034A1 *||Jun 3, 1980||Jan 8, 1981||Polymer Technology Corp||Reinigungsmittel fuer kontaktlinsen und dessen anwendung|
|EP0063472A2 *||Apr 15, 1982||Oct 27, 1982||Alcon Laboratories, Inc.||Cleansing composition for optical surfaces and method of cleansing a contact lens|
|EP0063472A3 *||Apr 15, 1982||May 4, 1983||Alcon Laboratories Inc||Cleansing composition for optical surfaces and method of cleansing a contact lens|
|EP0156563A1 *||Mar 7, 1985||Oct 2, 1985||Minnesota Mining And Manufacturing Company||Disinfecting method and compositions|
|EP0278224A1 *||Jan 9, 1988||Aug 17, 1988||Henkel Kommanditgesellschaft auf Aktien||Process for the production of disinfecting working contact lenses - cleaning agents tablets|
|EP0947203A2 *||Mar 25, 1999||Oct 6, 1999||Menicon Co., Ltd.||Agent for contact lenses|
|EP0947203A3 *||Mar 25, 1999||Dec 20, 2000||Menicon Co., Ltd.||Agent for contact lenses|
|EP1203808A1 *||Jul 17, 1998||May 8, 2002||Alcon Laboratories, Inc.||Conditioning solutions for hard contact lens care|
|WO1999006512A1 *||Jul 17, 1998||Feb 11, 1999||Alcon Laboratories, Inc.||Conditioning solutions for hard contact lens care|
|U.S. Classification||510/112, 510/383, 516/72, 424/78.4, 510/489, 516/DIG.200, 516/110, 514/496|
|International Classification||C11D1/14, C11D3/00, A61L12/08, C11D1/74, C11D17/00, C11D3/48, C11D1/72|
|Cooperative Classification||C11D3/0078, C11D3/48, Y10S516/02, C11D1/72, C11D1/146, C11D1/74, A61L12/08, C11D17/003|
|European Classification||C11D3/48, C11D3/00B16, C11D17/00B6, A61L12/08|