WO1991004288A1 - Non-irritating soft gas permeable contact lens and process for producing same - Google Patents
Non-irritating soft gas permeable contact lens and process for producing same Download PDFInfo
- Publication number
- WO1991004288A1 WO1991004288A1 PCT/US1990/003996 US9003996W WO9104288A1 WO 1991004288 A1 WO1991004288 A1 WO 1991004288A1 US 9003996 W US9003996 W US 9003996W WO 9104288 A1 WO9104288 A1 WO 9104288A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- contact lens
- hydrophilic
- organic solvent
- lens according
- polar group
- Prior art date
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Classifications
-
- 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
Definitions
- the present invention relates to contact lenses, and more particularly, to clinically-acceptable silicone- based soft gas permeable contact lenses and methods for their manufacture.
- HGP hard gas permeable
- plastic materials acrylic silicone or acrylic fluorosilicone.
- the oxygen permeability of HGP lenses can progressively be increased with increasing amounts of the silicone and/or fluorosilicone in the composition; at the same time, however, the surface wettability of the lens becomes progressively poorer.
- methacrylic acid, an ionic material it is known to incorporate a relatively large amount of methacrylic acid, an ionic material, into the formulation, resulting in the lens surface being negative ⁇ ly charged. While this expedient does lead to improved surface wettability, the negatively-charged surface has a very high absorptivity leading to serious deposition pro ⁇ blems. As a consequence, the HGP lens is of only limited potential.
- hydrophilic soft gas permeable (SGP) lenses have been developed based upon compositions con ⁇ taining, e.g., a polymerizable vinylic siloxane and a hydrophilic vinylic monomer. See, e.g., U.S. Patent Nos. 4,136,250; 4,139,513; 4,182,822; 4,261,875; 4,343,927; 4,426,389; 4,486,577; 4,605,712; 4,711,943; and 4,837,289.
- the SGP lenses of this type have excellent oxygen permeability and hydrophilicity.
- the lens is highly hydrophilic, its functional (i.e., on the eye) wettability is still relatively poor, and the lens is highly irritable and uncomfortable, often resulting in serious deposition problems, making it highly unsuitable for extended wear.
- silicone-based SGP lenses of the prior art contain a substantial amount of residual siloxane monomer and derivatives, resulting in a high degree of irritabi ⁇ lity, poor wettability and serious deposition problems.
- silicone-based SGP lenses which are prepared by a process in which the conventional SGP lens material, i.e., a polymerization product of a composition contain ⁇ ing polymerizable vinylic siloxane monomer, is formed into the shape of a lens (e.g., by lathe cutting, cast molding, spin casting or the like) and then, instead of being extracted with a physiological saline solution as is conventional, is extracted utilizing a hydrophilic, polar group-containing, organic solvent. After the organic solvent extraction step, the lens is treated to exchange physiological saline solution for organic solvent in the lens.
- the conventional SGP lens material i.e., a polymerization product of a composition contain ⁇ ing polymerizable vinylic siloxane monomer
- a silicone-based SGP lens can be produced having signifi ⁇ cantly reduced levels (preferably, undetectable levels) of residual siloxane monomer or other low molecular weight derivatives resulting from the polymerization reaction, and which accordingly are nonirritating in use and can be worn for extended periods without deposition problems.
- the silicone-based SGP lenses known in the art and to which this invention is applicable are formed, for example, from the polymerization product of compositions containing at least one polymerizable viny ⁇ lic siloxane monomer and at least one hydrophilic vinylic monomer.
- the polymerizable vinylic siloxane monomer contains at least one polymerizable vinylic group such as an acrylic, styrenyl or vinylic group and at least one polysiloxanyl group.
- Exemplary polymerizable vinylic siloxane monomers are:
- Hydrophilic vinylic monomers suitable for use in SGP lens compositions include N,N-dimethylacrylamide, 2-hydroxy- ethyl methacrylate, glyceryl methacrylate, and the like.
- compositions and technologies for fabrication of SGP lenses per se are well known in the art as exempli ⁇ fied in all the U.S. Patents mentioned previously, all of which are expressly incorporated herein by reference.
- the SGP material in the form of a lens, is thereafter subjected to extrac ⁇ tion with a hydrophilic, polar group-containing, organic solvent (hereinafter referred to as PGS).
- PGS hydrophilic, polar group-containing, organic solvent
- the PGS extraction is preferably conducted after this initial hydration step.
- the PGS for use in the invention can be selected from a wide variety of materials, the particular choice of which will be dictated to varying degrees by avail ⁇ ability, cost, and extraction ability for the particular residual components in the particular silicone-containing SGP lens material being employed.
- the selected PGS is an alcohol (ROH) , ketone (RCOR 1 ), alde ⁇ hyde (RCHO), ester (RCOOR' ) , amide (RCONR'R-') or N-alkyl pyrrolidone, where R,R' and R' ' are the same or different and are alkyl or, if applicable, hydrogen.
- the alkyl substituents are C to C s alkyls, which may be substituted or unsubstituted, and particular ⁇ ly preferred PGS's are the C_. to C 5 alcohols, most particularly isopropanol.
- the PGS can be mixtures of one or more of these PGS's.
- the PGS be employed in complete absence of water.
- the PGS extraction of the SGP lenses of this invention preferably is performed by soaking of the lens in the solvent, preferably with stirring, or alter ⁇ natively by Soxhlet extraction, for a period of time effective to reduce the residual siloxane monomer or other low molecular weight by-products of the polymeri ⁇ zation reaction to acceptably low, preferably undete ⁇ t- able, levels.
- the completion of the extraction can be monitored by gas chromagraphy (GC) of the residual irri ⁇ tants, such as residual monomer level, or the under agar cytotoxicity test, i.e., immersion of the extracted lens in agar to test for negative cytotoxicity response. Generally, 20-40 hours of extraction is adequate in an immersion process.
- GC gas chromagraphy
- the extraction period generally can be substan ⁇ tially shortened.
- a repeated extraction can also be performed.
- the extraction will be conducted at temperatures in the range of from about 20°C to 60°C.
- the PGS inside the lens has to be replaced by. a physiological saline solution either by a solvent exchange or by vacuum stripping to dry out the solvent inside the lens, follow ⁇ ed by reconditioning the lens in a physiological saline solution.
- a physiological saline solution either by a solvent exchange or by vacuum stripping to dry out the solvent inside the lens, follow ⁇ ed by reconditioning the lens in a physiological saline solution.
- the lens strength and the lens parameters can surprisingly be restored.
- the lenses thus made do not contain any detectable residual irritants or residual silicone monomer and show no cytotoxicity response. Clinically, the lenses thus made do not show any irritation to the eye.
- the lenses are extremely comfortable and can be worn for a long period of time without deposition problem.
- the substantially improved comfort and wearability of the lenses made from this invention result from the fact that the residual siloxane monomers and/or derivatives formed during the polymeri ⁇ zation reactions are essentially extracted out of the lenses thereby precluding the problem with conventionally- prepared SGP lenses where these residuals leach out to the lens surface in use and have a detrimental effect on the lens wettability, comfort and thus deposition problem and lens wearability.
- SGP lenses were fabricated from buttons which were made according to the formulations and procedures set forth in U.S. Patent No. 4,182,822, the starting formu ⁇ lation consisting of 36% by weight jr-tris(trimethyl ⁇ siloxy) silylpropyl methacrylate (prepared according to Example 1 of the above patent) , 44% by weight N,N-dime- thylacrylamide (NNDMA, a hydrophilic monomer) and 20% by weight 2-hydroxyethylmethacrylate (HEMA), with 0.3% by weight t-butyl peroxypyvalate included as a catalyst.
- NMDMA N,N-dime- thylacrylamide
- HEMA 2-hydroxyethylmethacrylate
- the formulation was placed in a Teflon tube.
- the tube was sealed and the formulation was polymerized in a 40°C water bath for six (6) hours, followed by a 100°C treat ⁇ ment for another six hours.
- the buttons cut from the rods were post-cured at 110°C under high vacuum (0.5 Torr) for 44 hours.
- the lenses could also be made from the formulation by cast molding or spin casting, techniques which are well known in the art.
- the lenses were subjected to the conventional approach of extraction in a physiological saline solution, at 60°C for 6 hours as practiced in the manufacture of the conventional soft lenses.
- the residual silicone monomers level in these extracted lenses monitored by GC was about 0.2%-0.5% by weight, and the level of hydrophilic monomer.was about 0.02-0.4% by weight.
- the lenses showed cytotoxicity response in agar testing. In clinical evaluation, lenses of this type were very irritable, uncomfortable and highly clinically unacceptable.
- the lenses after hydration were separately soaked in 4 ml isopropanol, a hydrophilic, polar group-containing, solvent, for 18 hours, followed by re-soaking in another 4 ml fresh isopropanol for 6 hours. Then isopropanol was decanted and replaced by a physiological saline solution without applying mechanical force to the lenses.
- the lenses thus prepared contained no detectable residual monomer by GC and showed no cytotoxic response in agar test. In clini ⁇ cal evaluation, the lenses showed no irritation and were very comfortable in extended wear. The strength of the lenses was also surprisingly recovered after extraction.
- the SGP lens materials of this Example can be extracted under similar conditions using, for example, acetone, methyethyl ketone, methyl acetate, N,N-dimethylacetamide or N-methyl pyrrolidone.
Abstract
Description
Claims
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US40726389A | 1989-09-14 | 1989-09-14 | |
US407,263 | 1989-09-14 | ||
US54520590A | 1990-06-28 | 1990-06-28 | |
US545,205 | 1990-06-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1991004288A1 true WO1991004288A1 (en) | 1991-04-04 |
Family
ID=27019827
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1990/003996 WO1991004288A1 (en) | 1989-09-14 | 1990-07-16 | Non-irritating soft gas permeable contact lens and process for producing same |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0441916A4 (en) |
JP (1) | JPH04501924A (en) |
AU (1) | AU635554B2 (en) |
WO (1) | WO1991004288A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0908744A1 (en) * | 1997-10-09 | 1999-04-14 | JOHNSON & JOHNSON VISION PRODUCTS, INC. | Silicone hydrogel polymers |
WO2001002881A1 (en) * | 1999-07-01 | 2001-01-11 | Bausch & Lomb Incorporated | Process for removing extractables from polymeric contact lenses |
WO2002036669A2 (en) * | 2000-11-03 | 2002-05-10 | Johnson & Johnson Vision Care, Inc. | Solvents useful in the preparation of polymers containing hydrophilic and hydrophobic monomers |
US7052131B2 (en) | 2001-09-10 | 2006-05-30 | J&J Vision Care, Inc. | Biomedical devices containing internal wetting agents |
US7666921B2 (en) | 2001-09-10 | 2010-02-23 | Johnson & Johnson Vision Care, Inc. | Biomedical devices containing internal wetting agents |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8414804B2 (en) * | 2006-03-23 | 2013-04-09 | Johnson & Johnson Vision Care, Inc. | Process for making ophthalmic lenses |
Citations (9)
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US3937680A (en) * | 1973-05-29 | 1976-02-10 | Global Vision, Inc. | Hydrophilic gel terpolymers from hydrophilic n-vinyl monomers, hydroxyalkyl acrylates or methacrylates and polymerizable unsaturated carboxylic acids |
US4139513A (en) * | 1977-11-08 | 1979-02-13 | Toyo Contact Lens Co., Ltd. | Copolymer for soft contact lens, its preparation and soft contact lens made thereof |
US4261875A (en) * | 1979-01-31 | 1981-04-14 | American Optical Corporation | Contact lenses containing hydrophilic silicone polymers |
US4330383A (en) * | 1978-07-18 | 1982-05-18 | Polymer Technology Corporation | Dimensionally stable oxygen permeable hard contact lens material and method of manufacture |
US4343927A (en) * | 1976-11-08 | 1982-08-10 | Chang Sing Hsiung | Hydrophilic, soft and oxygen permeable copolymer compositions |
US4550001A (en) * | 1981-06-22 | 1985-10-29 | Japan Synthetic Rubber Co., Ltd. | Process for producing shaped articles having improved surfaces |
US4711943A (en) * | 1985-04-26 | 1987-12-08 | Sola U.S.A. Inc. | Hydrophilic siloxane monomers and dimers for contact lens materials, and contact lenses fabricated therefrom |
US4929717A (en) * | 1987-07-25 | 1990-05-29 | Chemische Fabrik Stockhausen Gmbh | Method of preparing polymers with a low residual content of monomers |
US4954587A (en) * | 1988-07-05 | 1990-09-04 | Ciba-Geigy Corporation | Dimethylacrylamide-copolymer hydrogels with high oxygen permeability |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5940168B2 (en) * | 1979-08-20 | 1984-09-28 | ツエントラルニ ナウチノ−イススレドバテルスキ インステイチユト シエルチヤノイ プロミシユレンノステイ | halogenated azo dye |
FR2586612B1 (en) * | 1985-09-04 | 1989-08-11 | Ceskoslovenska Akademie Ved | PROCESS FOR THE PREPARATION OF PRE-MOLDED ELEMENTS FOR THE PRODUCTION OF CONTACT LENSES BY MACHINING |
-
1990
- 1990-07-16 AU AU60793/90A patent/AU635554B2/en not_active Ceased
- 1990-07-16 EP EP19900911531 patent/EP0441916A4/en not_active Withdrawn
- 1990-07-16 WO PCT/US1990/003996 patent/WO1991004288A1/en not_active Application Discontinuation
- 1990-07-16 JP JP51105290A patent/JPH04501924A/en active Pending
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
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US3937680A (en) * | 1973-05-29 | 1976-02-10 | Global Vision, Inc. | Hydrophilic gel terpolymers from hydrophilic n-vinyl monomers, hydroxyalkyl acrylates or methacrylates and polymerizable unsaturated carboxylic acids |
US4343927A (en) * | 1976-11-08 | 1982-08-10 | Chang Sing Hsiung | Hydrophilic, soft and oxygen permeable copolymer compositions |
US4139513A (en) * | 1977-11-08 | 1979-02-13 | Toyo Contact Lens Co., Ltd. | Copolymer for soft contact lens, its preparation and soft contact lens made thereof |
US4330383A (en) * | 1978-07-18 | 1982-05-18 | Polymer Technology Corporation | Dimensionally stable oxygen permeable hard contact lens material and method of manufacture |
US4261875A (en) * | 1979-01-31 | 1981-04-14 | American Optical Corporation | Contact lenses containing hydrophilic silicone polymers |
US4550001A (en) * | 1981-06-22 | 1985-10-29 | Japan Synthetic Rubber Co., Ltd. | Process for producing shaped articles having improved surfaces |
US4711943A (en) * | 1985-04-26 | 1987-12-08 | Sola U.S.A. Inc. | Hydrophilic siloxane monomers and dimers for contact lens materials, and contact lenses fabricated therefrom |
US4929717A (en) * | 1987-07-25 | 1990-05-29 | Chemische Fabrik Stockhausen Gmbh | Method of preparing polymers with a low residual content of monomers |
US4954587A (en) * | 1988-07-05 | 1990-09-04 | Ciba-Geigy Corporation | Dimethylacrylamide-copolymer hydrogels with high oxygen permeability |
Non-Patent Citations (1)
Title |
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See also references of EP0441916A4 * |
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6020445A (en) * | 1997-10-09 | 2000-02-01 | Johnson & Johnson Vision Products, Inc. | Silicone hydrogel polymers |
EP0908744A1 (en) * | 1997-10-09 | 1999-04-14 | JOHNSON & JOHNSON VISION PRODUCTS, INC. | Silicone hydrogel polymers |
WO2001002881A1 (en) * | 1999-07-01 | 2001-01-11 | Bausch & Lomb Incorporated | Process for removing extractables from polymeric contact lenses |
US7112652B2 (en) | 2000-11-03 | 2006-09-26 | Johnson & Johnson Vision Care, Inc. | Solvents useful in the preparation of polymers containing hydrophilic and hydrophobic monomers |
WO2002036669A2 (en) * | 2000-11-03 | 2002-05-10 | Johnson & Johnson Vision Care, Inc. | Solvents useful in the preparation of polymers containing hydrophilic and hydrophobic monomers |
WO2002036669A3 (en) * | 2000-11-03 | 2003-03-06 | Johnson & Johnson Vision Care | Solvents useful in the preparation of polymers containing hydrophilic and hydrophobic monomers |
US6765083B2 (en) | 2000-11-03 | 2004-07-20 | Johnson & Johnson Vision Care, Inc. | Solvents useful in the preparation of polymers containing hydrophilic and hydrophobic monomers |
AU2002227331B2 (en) * | 2000-11-03 | 2005-10-13 | Johnson & Johnson Vision Care, Inc | Solvents useful in the preparation of polymers containing hydrophilic and hydrophobic monomers |
US7666921B2 (en) | 2001-09-10 | 2010-02-23 | Johnson & Johnson Vision Care, Inc. | Biomedical devices containing internal wetting agents |
US8796353B2 (en) | 2001-09-10 | 2014-08-05 | Johnson & Johnson Vision Care, Inc. | Biomedical devices containing internal wetting agents |
US7052131B2 (en) | 2001-09-10 | 2006-05-30 | J&J Vision Care, Inc. | Biomedical devices containing internal wetting agents |
US7691916B2 (en) | 2001-09-10 | 2010-04-06 | Johnson & Johnson Vision Care, Inc. | Biomedical devices containing internal wetting agents |
US8168720B2 (en) | 2001-09-10 | 2012-05-01 | Johnson & Johnson Vision Care, Inc. | Biomedical devices containing internal wetting agents |
US8431669B2 (en) | 2001-09-10 | 2013-04-30 | Johnson & Johnson Vision Care, Inc. | Biomedical devices containing internal wetting agents |
US8450387B2 (en) | 2001-09-10 | 2013-05-28 | Johnson & Johnson Vision Care, Inc. | Biomedical devices containing internal wetting agents |
US7649058B2 (en) | 2001-09-10 | 2010-01-19 | Johnson & Johnson Vision Care, Inc. | Biomedical devices containing internal wetting agents |
US8895687B2 (en) | 2001-09-10 | 2014-11-25 | Johnson & Johnson Vision Care, Inc. | Biomedical devices containing internal wetting agents |
US9097914B2 (en) | 2001-09-10 | 2015-08-04 | Johnson & Johnson Vision Care, Inc. | Biomedical devices containing internal wetting agents |
US9958577B2 (en) | 2001-09-10 | 2018-05-01 | Johnson & Johnson Vision Care, Inc. | Biomedical devices containing internal wetting agents |
US10254443B2 (en) | 2001-09-10 | 2019-04-09 | Johnson & Johnson Vision Care, Inc. | Biomedical devices containing internal wetting agents |
US10641926B2 (en) | 2001-09-10 | 2020-05-05 | Johnson & Johnson Vision Care, Inc. | Biomedical devices containing internal wetting agents |
US10935696B2 (en) | 2001-09-10 | 2021-03-02 | Johnson & Johnson Vision Care, Inc. | Biomedical devices containing internal wetting agents |
US11360241B2 (en) | 2001-09-10 | 2022-06-14 | Johnson & Johnson Vision Care, Inc. | Biomedical devices containing internal wetting agents |
Also Published As
Publication number | Publication date |
---|---|
JPH04501924A (en) | 1992-04-02 |
EP0441916A1 (en) | 1991-08-21 |
AU635554B2 (en) | 1993-03-25 |
EP0441916A4 (en) | 1992-04-08 |
AU6079390A (en) | 1991-04-18 |
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