WO2021191657A1 - Method for manufacturing all types of rigid gas permeable contact lenses - Google Patents

Method for manufacturing all types of rigid gas permeable contact lenses Download PDF

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Publication number
WO2021191657A1
WO2021191657A1 PCT/IB2020/052713 IB2020052713W WO2021191657A1 WO 2021191657 A1 WO2021191657 A1 WO 2021191657A1 IB 2020052713 W IB2020052713 W IB 2020052713W WO 2021191657 A1 WO2021191657 A1 WO 2021191657A1
Authority
WO
WIPO (PCT)
Prior art keywords
rgp
workpiece
contact lenses
manufacturing
lenses
Prior art date
Application number
PCT/IB2020/052713
Other languages
French (fr)
Inventor
Andrei GILIA
Original Assignee
Gilia Andrei
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gilia Andrei filed Critical Gilia Andrei
Priority to PCT/IB2020/052713 priority Critical patent/WO2021191657A1/en
Publication of WO2021191657A1 publication Critical patent/WO2021191657A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00009—Production of simple or compound lenses
    • B29D11/00038—Production of contact lenses
    • B29D11/00105—Production of contact lenses covering a large part of the cornea
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
    • B29C33/3842—Manufacturing moulds, e.g. shaping the mould surface by machining
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/0029—Cold deforming of thermoplastics material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00009—Production of simple or compound lenses
    • B29D11/00038—Production of contact lenses
    • B29D11/00076—Production of contact lenses enabling passage of fluids, e.g. oxygen, tears, between the area under the lens and the lens exterior
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00009—Production of simple or compound lenses
    • B29D11/00038—Production of contact lenses
    • B29D11/00125—Auxiliary operations, e.g. removing oxygen from the mould, conveying moulds from a storage to the production line in an inert atmosphere
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
    • B29C33/40—Plastics, e.g. foam or rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00009—Production of simple or compound lenses
    • B29D11/0048—Moulds for lenses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00932—Combined cutting and grinding thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2033/00—Use of polymers of unsaturated acids or derivatives thereof as moulding material
    • B29K2033/04—Polymers of esters
    • B29K2033/12—Polymers of methacrylic acid esters, e.g. PMMA, i.e. polymethylmethacrylate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2011/00—Optical elements, e.g. lenses, prisms
    • B29L2011/0016—Lenses
    • B29L2011/0041—Contact lenses

Definitions

  • the invention relates to manufacturing the RGP contact lenses including orthokeratologic lenses, which pertains to the technical field of polymer materials, and particularly to a method for manufacturing of all types of RGP contact lenses : corneal, corneoscleral, scleral by using intermediate obligatory pre-treatment key technology stage : softening of polymer RGP disc for later processing.
  • pretreatment stage is the key core distinctive feature differed from known existing prior art RGP lens manufacturing process.
  • RGP contact lenses are lenses that are worn directly on the human eye and used primarily to correct vision in patients with high ametropia states, keratoconus, corneal ectasia disorders and for slowing myopia progression by using orthokeratologic lenses (also known as OK-lenses, night wear lenses: RGP orthokeratologic lenses that can be worn overnight).
  • orthokeratologic lenses also known as OK-lenses, night wear lenses: RGP orthokeratologic lenses that can be worn overnight.
  • the current RGP contact lenses are manufactured from oxygen permeable material with high Dk by high precision lathe with relatively long processing cycle, low productivity and high amount of related industrial polymer wastes per produced RGP lens, accompanying high precision lathe process and composing approximately 70-80 % more or less of total initial volume of workpiece.
  • the first main difference of the present invention from existing RGP manufacturing technology consist in the usage of precision lathe only for the initial processing: cutting the rigid polymer RGP button to multiple thin polymer RGP disks with predefined diameter and thickness appropriate to the end product lens thickness and diameter and not by lathe machining the whole lens body as end product from polymer RGP button.
  • the second main difference is the usage of intermediate obligatory pretreatment key technology stage : softening of polymer RGP disc for later processing.
  • the method of the present invention can be standardized, industrialized, by utilizing RGP softened workpiece profile with bondage convex-concave (BCC) mold forms of special design in conjunction with prolonged stamping compression molding production technology; pre-designing the lens mold of special design, one-step forming, using the bondage mold press forms with preliminary modified/softened workpiece disk and thus greatly improving the production efficiency of manufacturing process.
  • BCC bondage convex-concave
  • the present proposed manufacturing method allows to produce all types of RGP lenses including orthokeratologic lenses more resistant to rupture, flexible and thinner at the same time with necessary appropriate strength parameters and increased oxygen permeability capabilities due to more thinner design with constant lens thickness profile throughout the outer and inner lens surface.
  • the constant oxygen permeability is achieved among other things by improved and more perfect congruence of inner curves of lens to the outer curves of lens with constant value of thickness upon the whole inner and outer surface of the lens.
  • the method can significantly reduce industrial polymer wastes in comparison to manufacturing with common lathe method , so as significantly shorten production time cycle, improve the productivity and solve the problems of long processing cycle, low productivity and poor reproducibility of the traditional prior art manufacturing process.
  • the object of the present invention is to provide a method for manufacturing RGP contact lenses, and preferably – orthokeratologic lenses to solve the technical problem.
  • a method for manufacturing RGP contact lenses comprises the following steps:
  • A. Mold design and processing designing the lens parameters required for RGP contact lenses, and using precision lathe for initial machining : to process the workpiece button by lathe machining to estimated diameter, cutting workpiece button to multiple round discs of estimated thickness and diameter, equal to the end product RGP lens parameters, processing the edges, polishing, marking it and then using the bondage molds press forms of special design for the latter processing of the lenses by prolonged stamping by inserting preliminary softened polymer disc in mold press forms for subsequent processing;
  • B Preparation of a polymer material of RGP contact lenses; pretreating an appropriate RGP polymer material: fluoro-silicone/acrylate, methyl methacrylate (MMA) with TRIS, fluoro-silicone acrylate and derivative materials with high Dk as a host material by chemical method by using appropriate chemical composition of chemical ingredients (a compound or mixture); and chemical compound/compounds, any combination of thereof are used for initial reversible softening the polymer workpiece disc to the transient appropriate soft state applicable for further mold to shape the workpiece in one step.
  • the pretreatment comprises preliminary reversible softening of workpiece to appropriate state for latter forming by prolonged stamping with specified parameters by using press bondage concave-convex mold press forms;
  • C Preparation of a polymer material of RGP contact lenses; pretreating an appropriate RGP polymer material: fluoro-silicone/acrylate, methyl methacrylate (MMA) with TRIS, fluoro-silicone acrylate and derivative materials with high
  • Prolonged stamping compression molding of RGP contact lenses using the designed mold with the RGP contact lenses end-product parameters and the required lenses are formed by prolonged stamping in mold press forms the softened workpiece disc by subsequent restoring the initial modulus of elasticity (changing the modulus of elasticity, reversible transition to solid state back from soft state) after ending of action of chemical softening initiator.
  • the mold press form consists of two parts: convex part and concave part with specified diameters and circular tilt- angle marginal inner zone in particular, for prevention of lens decentration in the press form during processing. And the mold press forms can be performed with drainage holes or/and slots or other additional design variabilities by technical task demand.
  • the mold press forms with lens is immersed in distilled water for 1 h at 20 degrees Celsius. Finally, the mold with lens is preserved in phosphate buffered saline solution (pH 7.4) at room temperature for 24 h.
  • the mold materials comprise materials such as plastic, glass, crystal and the like
  • the mold preparing in step A can first manufacture the plastic mold by high precision lathe method.
  • the mold press forms are performed with drainage holes or/and slots by technical task demand.
  • a method for manufacturing all types RGP contact lenses and preferably including orthokeratologic lenses comprising the following steps:
  • C. Compression molding of RGP contact lenses using the designed mold with the RGP lenses product parameters, the required lenses are formed by changing the curvature/curvatures of workpiece disc being in reversible short-term soft condition in mold press forms and keep the final curvature/curvatures and diameter after ending of action of pretreatment agent for estimated time by reversible restoring of initial solid state of polymer material while being in mold press forms.
  • Subsequent processing a combination of one or more steps by demand in mold opening, cleaning, testing, packaging.
  • the mold material of step A is any of the following materials : glass, plastic: polypropylene (PP) plastic, polybutylene terephthalate (PBT) plastic or other thermoplastic polyesters or its combination.
  • PP polypropylene
  • PBT polybutylene terephthalate
  • Chemical compound/compounds means any chemical compound/compounds appropriate for reversible or irreversible softening lens workpiece material.
  • the polymer material refers to a class of polymers fluoro-silicone/acrylate, methyl methacrylate (MMA) with TRIS, fluoro-silicone acrylate and derivative materials or analogous equivalent material with high Dk as a host material or any combination of thereof or any appropriate material as a host material appropriate for manufacturing RGP lenses, and their oxygen permeability coefficient is preferably greater than 15 Dk and appropriate for RGP manufacturing including orthokeratologic RGP.
  • the subsequent processing further comprises processing that may be performed on the size and appearance of the lenses.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • Eyeglasses (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

A method for manufacturing of all types of rigid gas-permeable (RGP) contact lenses : scleral, corneoscleral and corneal lenses and preferably-orthokeratologic lenses by new controlled programmed bending technology and prolonged stamping technology using initially softened workpiece profile preferably made from oxygen (preferably high oxygen) permeability material and special mold press forms; comprising: designing the two-side lens mold bondage concave-convex press forms; preliminary preparing RGP lenses by initial cutting the polymer workpiece button into multiple plane round state pieces or plates with specified predefined diameter and thickness, processed edges, dual-side polishing, and using mold press forms of special design for controlled programmed bending of pretreated reversible softened initial rigid workpiece RGP material profile and pretreatment stage, i.e., softening -is achieved through modifying/changing the modulus of elasticity of initially rigid polymer RGP workpiece by using chemical method and chemical compound or compounds.

Description

Chemically Controlled Programmed Bending Technology For Rigid Gas-Permeable Lens Manufacturing
The invention relates to manufacturing the RGP contact lenses including orthokeratologic lenses, which pertains to the technical field of polymer materials, and particularly to a method for manufacturing of all types of RGP contact lenses : corneal, corneoscleral, scleral by using intermediate obligatory pre-treatment key technology stage : softening of polymer RGP disc for later processing. And pretreatment stage is the key core distinctive feature differed from known existing prior art RGP lens manufacturing process.
RGP contact lenses, are lenses that are worn directly on the human eye and used primarily to correct vision in patients with high ametropia states, keratoconus, corneal ectasia disorders and for slowing myopia progression by using orthokeratologic lenses (also known as OK-lenses, night wear lenses: RGP orthokeratologic lenses that can be worn overnight).
The current RGP contact lenses are manufactured from oxygen permeable material with high Dk by high precision lathe with relatively long processing cycle, low productivity and high amount of related industrial polymer wastes per produced RGP lens, accompanying high precision lathe process and composing approximately 70-80 % more or less of total initial volume of workpiece.
The first main difference of the present invention from existing RGP manufacturing technology consist in the usage of precision lathe only for the initial processing: cutting the rigid polymer RGP button to multiple thin polymer RGP disks with predefined diameter and thickness appropriate to the end product lens thickness and diameter and not by lathe machining the whole lens body as end product from polymer RGP button. And the second main difference is the usage of intermediate obligatory pretreatment key technology stage : softening of polymer RGP disc for later processing.
The method of the present invention can be standardized, industrialized, by utilizing RGP softened workpiece profile with bondage convex-concave (BCC) mold forms of special design in conjunction with prolonged stamping compression molding production technology; pre-designing the lens mold of special design, one-step forming, using the bondage mold press forms with preliminary modified/softened workpiece disk and thus greatly improving the production efficiency of manufacturing process.
Advantageous Effects of Invention
The present proposed manufacturing method allows to produce all types of RGP lenses including orthokeratologic lenses more resistant to rupture, flexible and thinner at the same time with necessary appropriate strength parameters and increased oxygen permeability capabilities due to more thinner design with constant lens thickness profile throughout the outer and inner lens surface. The constant oxygen permeability is achieved among other things by improved and more perfect congruence of inner curves of lens to the outer curves of lens with constant value of thickness upon the whole inner and outer surface of the lens. Moreover the method can significantly reduce industrial polymer wastes in comparison to manufacturing with common lathe method , so as significantly shorten production time cycle, improve the productivity and solve the problems of long processing cycle, low productivity and poor reproducibility of the traditional prior art manufacturing process.
The object of the present invention is to provide a method for manufacturing RGP contact lenses, and preferably – orthokeratologic lenses to solve the technical problem.
A method for manufacturing RGP contact lenses, comprises the following steps:
A. Mold design and processing: designing the lens parameters required for RGP contact lenses, and using precision lathe for initial machining : to process the workpiece button by lathe machining to estimated diameter, cutting workpiece button to multiple round discs of estimated thickness and diameter, equal to the end product RGP lens parameters, processing the edges, polishing, marking it and then using the bondage molds press forms of special design for the latter processing of the lenses by prolonged stamping by inserting preliminary softened polymer disc in mold press forms for subsequent processing;
B. Preparation of a polymer material of RGP contact lenses; pretreating an appropriate RGP polymer material: fluoro-silicone/acrylate, methyl methacrylate (MMA) with TRIS, fluoro-silicone acrylate and derivative materials with high Dk as a host material by chemical method by using appropriate chemical composition of chemical ingredients (a compound or mixture); and chemical compound/compounds, any combination of thereof are used for initial reversible softening the polymer workpiece disc to the transient appropriate soft state applicable for further mold to shape the workpiece in one step. And the pretreatment comprises preliminary reversible softening of workpiece to appropriate state for latter forming by prolonged stamping with specified parameters by using press bondage concave-convex mold press forms;
C. Prolonged stamping compression molding of RGP contact lenses: using the designed mold with the RGP contact lenses end-product parameters and the required lenses are formed by prolonged stamping in mold press forms the softened workpiece disc by subsequent restoring the initial modulus of elasticity (changing the modulus of elasticity, reversible transition to solid state back from soft state) after ending of action of chemical softening initiator. The mold press form consists of two parts: convex part and concave part with specified diameters and circular tilt- angle marginal inner zone in particular, for prevention of lens decentration in the press form during processing. And the mold press forms can be performed with drainage holes or/and slots or other additional design variabilities by technical task demand. The mold press forms with lens is immersed in distilled water for 1 h at 20 degrees Celsius. Finally, the mold with lens is preserved in phosphate buffered saline solution (pH 7.4) at room temperature for 24 h.
D. After demolding the subsequent processing: a combination of one or more steps by demand in mold opening, cleaning, testing, packaging.
Preferably, the mold materials comprise materials such as plastic, glass, crystal and the like, the mold preparing in step A can first manufacture the plastic mold by high precision lathe method.
Preferably the mold press forms are performed with drainage holes or/and slots by technical task demand.
The embodiments of the present invention are described in detail below, but the present invention may be implemented in various different ways as defined and covered in the following claims. 
Examples
A method for manufacturing all types RGP contact lenses and preferably including orthokeratologic lenses comprising the following steps: 
A. Mold of special design and processing: designing the lens parameters required for RGP lenses, and using precision lathe to process the mold required for the lenses; 
B. Preparation of a polymer material of RGP lenses; pretreating a fluoro-silicone/acrylate material as a host material by chemical method by using appropriate chemical composition of chemical ingredient/ingredients (a compound or mixture), or a combination of thereof capable of reversible changing the initial rigid state of workpiece to soft but not liquid condition for estimated period of time, so as keeping the specified thickness and diameter parameters with a valid reversible or irreversible deviation of 5-10 % from specified parameters: thickness, diameter, and lathe stage is followed by softening pre-treatment stage, and chemical initiator meaning chemical ingredient/ingredients (a compound or mixture), capable of reversible modifying the initial rigid, solid workpiece polymer state to soft state but not to liquid state during direct or indirect contact with chemical compound/compounds solely or in mixture or by immersing workpiece in the volume of chemical compound/compounds or by vapor of compound/compounds for specified necessary estimated period of time to achieve the temporary short-term soft condition of the workpiece appropriate for changing its form for subsequent processing by inserting soft workpiece disc into mold press forms of special design.
C. Compression molding of RGP contact lenses: using the designed mold with the RGP lenses product parameters, the required lenses are formed by changing the curvature/curvatures of workpiece disc being in reversible short-term soft condition in mold press forms and keep the final curvature/curvatures and diameter after ending of action of pretreatment agent for estimated time by reversible restoring of initial solid state of polymer material while being in mold press forms.
D. Subsequent processing: a combination of one or more steps by demand in mold opening, cleaning, testing, packaging.
The mold material of step A is any of the following materials : glass, plastic: polypropylene (PP) plastic, polybutylene terephthalate (PBT) plastic or other thermoplastic polyesters or its combination.
Chemical compound/compounds means any chemical compound/compounds appropriate for reversible or irreversible softening lens workpiece material.
In step B, the polymer material refers to a class of polymers fluoro-silicone/acrylate, methyl methacrylate (MMA) with TRIS, fluoro-silicone acrylate and derivative materials or analogous equivalent material with high Dk as a host material or any combination of thereof or any appropriate material as a host material appropriate for manufacturing RGP lenses, and their oxygen permeability coefficient is preferably greater than 15 Dk and appropriate for RGP manufacturing including orthokeratologic RGP.
The subsequent processing further comprises processing that may be performed on the size and appearance of the lenses.
The description above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and alterations of the present invention are readily recognized by those skilled in the art. Any modifications, equivalent substitutions, improvements and the like made within the spirit and scope of the present invention are within the scope of the present invention.

Claims (7)

  1. A method for manufacturing all types of RGP contact lenses: corneal, scleral, corneoscleral contact lenses, and preferably orthokeratologic lenses, comprising the following steps:
    1. Mold design and processing: designing lens parameters required for RGP contact lenses, and using precision lathe to process the mold press forms, required for the RGP lens manufacturing;
    2. Preparation of a polymer material of the RGP contact lenses; pretreating a polymer material with high Dk as a host material with appropriate chemical composition of chemical ingredient/ingredients (a compound or mixture) or combination thereof, capable of reversible changing the initial rigid state of workpiece to soft condition but not liquid condition for estimated period of time.
    3. Chemical initiator meaning any appropriate chemical compound/compounds, or chemical composition of chemical ingredient/ingredients (a compound or mixture) applicable for reversible modifying the initial rigid, solid workpiece polymer state to soft state but not to liquid state during direct or indirect contact with chemical compound/compounds or by immersing workpiece in the volume of compound/compounds or by vapor of compound/compounds with specified necessary estimated period of time to achieve transient temporary short-term soft condition of the workpiece appropriate for changing its form and curvature/curvatures for subsequent processing and the pretreatment comprises transforming the workpiece initial solid state to soft state applicable for latter prolonged stamping using press forms. And softening pretreatment stage is the key core distinctive feature from existing prior art RGP lens manufacturing process.
    4. Compression molding of the RGP contact lenses: using the designed mold with the RGP contact lenses end-product parameters, the required lenses are formed by prolonged stamping using mold press forms;
    5. Subsequent processing: a combination of one or more steps for keeping necessary amount of time for restoring the initial solid state of the lens after pretreatment procedure, mold opening, cleaning, testing, packaging.
  2. The method for preparing the RGP contact lenses of claim 1, wherein the mold materials in step A comprise any one of plastic, glass, crystal.
  3. The method for manufacturing the RGP contact lenses of claim 2, wherein the mold preparing in step A including the mold materials such as plastic, glass, crystal and the like, and preferably, mold press forms in step A can be manufactured by high precision lathe method.
  4. The method for manufacturing the RGP contact lenses of claim 1, wherein in step B, the preferably polymer material for RGP lenses is fluoro-silicone/acrylate, methyl methacrylate (MMA) with TRIS, fluoro-silicone acrylate and/or derivative materials or any analogous appropriate material for RGP manufacturing and preferably, material refers to a class of polymers with oxygen permeability coefficient is preferably greater than 15 Dk appropriate for RGP manufacturing.
  5. The method for manufacturing the RGP contact lenses of claim 1, wherein the other compounds in step B refer to a chemical agent as the initiator required for the chemical reaction and interaction with host polymer RGP workpiece in such a way for reversible changing of initial solid state of workpiece polymer disk to soft state for latter processing in molds.
  6. The method for manufacturing the RGP contact lenses of claim 5, wherein the initiator is a chemical initiator.
  7. The method for manufacturing the RGP contact lenses of claim 6, wherein the chemical initiator is appropriate chemical compound or the combination of thereof or chemical composition of chemical ingredient/ingredients (a compound or mixture) capable of reversible changing the initial rigid state of workpiece to soft but not liquid condition for estimated period of time for latter processing in molds.
PCT/IB2020/052713 2020-03-23 2020-03-23 Method for manufacturing all types of rigid gas permeable contact lenses WO2021191657A1 (en)

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PCT/IB2020/052713 WO2021191657A1 (en) 2020-03-23 2020-03-23 Method for manufacturing all types of rigid gas permeable contact lenses

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Application Number Priority Date Filing Date Title
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5141677A (en) * 1991-01-22 1992-08-25 Minnesota Mining And Manufacturing Company Method of hot stamping intraocular lens bodies
US20080315444A1 (en) * 2004-01-13 2008-12-25 Polymer Sciences Limited Moulding Process
US20190270264A1 (en) * 2016-11-18 2019-09-05 Haichang Contact Lenses Co., Ltd. Method for preparing rigid corneal contact lenses

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5141677A (en) * 1991-01-22 1992-08-25 Minnesota Mining And Manufacturing Company Method of hot stamping intraocular lens bodies
US20080315444A1 (en) * 2004-01-13 2008-12-25 Polymer Sciences Limited Moulding Process
US20190270264A1 (en) * 2016-11-18 2019-09-05 Haichang Contact Lenses Co., Ltd. Method for preparing rigid corneal contact lenses

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