GB2408230A - Method of making contact lenses with holes and apertures - Google Patents

Method of making contact lenses with holes and apertures Download PDF

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Publication number
GB2408230A
GB2408230A GB0326884A GB0326884A GB2408230A GB 2408230 A GB2408230 A GB 2408230A GB 0326884 A GB0326884 A GB 0326884A GB 0326884 A GB0326884 A GB 0326884A GB 2408230 A GB2408230 A GB 2408230A
Authority
GB
United Kingdom
Prior art keywords
lens
apertures
material
holes
rods
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
GB0326884A
Other versions
GB0326884D0 (en
Inventor
Campbell Mckay Taylor
Original Assignee
Campbell Mckay Taylor
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 Campbell Mckay Taylor filed Critical Campbell Mckay Taylor
Priority to GB0326884A priority Critical patent/GB2408230A/en
Publication of GB0326884D0 publication Critical patent/GB0326884D0/en
Publication of GB2408230A publication Critical patent/GB2408230A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C41/00Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/02Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
    • B29C41/04Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould
    • B29C41/042Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould by rotating a mould around its axis of symmetry
    • B29C41/045Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould by rotating a mould around its axis of symmetry the axis being placed vertically, e.g. spin casting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B26HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26FPERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/24Perforating by needles or pins
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B26HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26FPERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/32Hand-held perforating or punching apparatus, e.g. awls
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00Moulds or cores; Details thereof or accessories therefor
    • B29C33/0033Moulds or cores; Details thereof or accessories therefor constructed for making articles provided with holes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29DPRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00Producing optical elements, e.g. lenses or prisms
    • B29D11/00009Production of simple or compound lenses
    • B29D11/00038Production of contact lenses
    • B29D11/00076Production of contact lenses enabling passage of fluids, e.g. oxygen, tears, between the area under the lens and the lens exterior
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B26HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26DCUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/08Means for treating work or cutting member to facilitate cutting
    • B26D7/10Means for treating work or cutting member to facilitate cutting by heating
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C39/00Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
    • B29C39/02Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
    • B29C39/10Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. casting around inserts or for coating articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C41/00Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/34Component parts, details or accessories; Auxiliary operations
    • B29C41/38Moulds, cores or other substrates
    • B29C41/40Cores

Abstract

A method of making holes and apertures FG in contact lenses comprises implanting rods, spheres or shapes of one material within another material; one material having a greater expansion ratio than the other when immersed in water so that during immersion the materials will separate providing a lens with fenestration holes or apertures. The lenses may be made from silicon, nylon or a hydrophilic material and the rods or pegs from an acrylic material. A second embodiment uses rod or peg inserts (ACR figure 8) placed in a spin casting device which then become embedded during forming of the lens and separated during immersion in a hydrating process. A third embodiment relates to making holes or apertures by piercing the lens using a heated needle.

Description

ALTERNATIVE METHODS OF MAKING CONTACT LENSES WITH HOLES AND APERTURES

The invention comprises new methods of creating highly polished fenestrations and apertures without the need of polishing in two embodiments; in which one embodiment embraces the bonding of different materials for lathing contact lenses, whilst a second embodiment is utilised in producing spin cast lenses with the same aim; a third embodiment, heat piercing, which can be performed on hydrated lenses, requires the dehydration and subsequent surface polishing of the lens.

Fenestration holes and apertures permit access of fresh sustenance bearing tears to the eye, draining toxic bearing spent tears therefrom.

Nutriments in fresh tears liquid are emitted from the lacrimal gland situated above the eye and the nutriments contained therein enter the eye, topically, just above the centre of the eye, whilst toxic bearing waste products are expelled into tears liquid from a site just below the centre of the eye from where the spent tears liquid is drained into the nasal cavity.

ANGLES AND DIAMETERS OF HOLES AND APERTURES.

Rods or pegs can be placed at any desired angle from the optical axis of the lens. which is the the line normal to the surfaces of a lens along which light passes undeviated.

Rods or pegs are highly polished in order to produce a highly polished fenestration hole or aperture. The fenestration holes ore apertures may be of any diameter deemed necessary.

LENS MATERIAL

Contact lenses are made form any of a number of materials such as: Methylmethacrylate, gas permeable, silicone, nylon, hydrophilic or any other suitable substance.

BONDED MATERIALS TO MANUFACTURE LATHED LENSES.

In the first embodiment highly polished rods, spheres or any requisite shape of one material is embedded in another material then removed after the contact lens is fabricated.

Holes and apertures may be formed by utilising rods, spheres ellipses or any required shape, preformed to emulate the requisite shape..

In one embodiment acrylate rods are embedded in a hydrophilic button remaining throughout the cutting and polishing process but would drop out when the hydrophilic material expands during hydration.

In a further embodiment acrylate rods are embedded in a silicone button and pressed out after processing.

Lenses formed from silicone require hydrophilic spraying on the lens surfaces and chunnels to provide acceptable comfort.

After such processing clean chunnels are achieved in the final lens.

Lathed contact lenses are fabricated from dehydrated material.

The bonded material is formed into a BUTTON or BLANK which is placed on a lathe. The concave back surface is cut and polished then the semi finished blank reversed, so that the front convex surface is formed.

The finished lens is placed in a solution of saline or distilled water where, in the case of bonded methylmethacrylate and hydrophilic materials separation occurs due to relative expansion of the hydrophilic material.

When two materials such as silicone rubber and hydrophilic material are used the hydrophilic material will spring out of the silicone rubber material.

Once the lens is fully hydrated it is placed in a stirrer so that any remaining impurities are removed.

STIRRER

A heated stirring device which revolves contact lenses in a basket cleaning process with a vortex effect.

HEAT PIERCING

A further method of fenestrating soft lenses, herewith advanced, is heat piercing.

Heat piercing is performed by placing a contact lens on a metal former and piercing with an electric or butane solder iron fitted with a needle or appropriately shaped head in order to create a fenestration hole or an aperture. When heated to the desired temperature this is introduced to a hydrated contact lens which it pierces, forming a fenestration or aperture. Dehydration of the soft lens and subsequent surface polishing is required. One suggested method is performed with a polish impregnated bud mounted on a slow revolving mini-drill.

Heat piecing can be performed on a hydrated or dehydrated contact lens.

SPIN CAST LENSES

In a further embodiment of the invention, in the manufacture of hydrophilic contact lenses, removable rods or pegs are placed in a capped spinning cup. Once the lens is formed and set then after hydration, the rods or pegs gently separate leaving a lens with highly polished fenestration holes or apertures.

SPIN CASTING

The spin casting method of producing a contact lens is now described.

Without going into the intricacies of contact lens manufacturing, one method of producing a soft hydrophilic spin cast lens is to inject liquid monomers of hydroxethyl methacrylate and ethylene diglycol methacrylate this combination is stored at a temperature of - 5 degrees Centigrade. When injected through a polythene tube at into a rotating female mould, polymerization occurs in a carbon dioxide atmosphere.

By controlling the variables of mould diameter, spin speed and the- volume of monomer injected it is possible to produce lenses of differing powers and sizes.

An upper plate with an inner convex curve matching the required back central optical radius of the proposed lens, whilst the curvature of the female mould corresponds to the proposed front surface of the lens. Acrylate rods or shaped pegs are slotted into the mould, becoming embedded in the forming lens during the spin casting process. After which the final lens containing the embedded rods or pegs is removed and hydrated. During the hydration the hydrogel lens expands and the rods are separated due to difference in the expansion ratios of the two materials, the rods or pegs are expelled leaving fenestration holes or apertures.

CONVENTIONAL METHODS OF FENESTRATING.

The above methods are advanced as alternatives to manual drilling or, laser drilling which require both surface polishing and polishing of the walls of the fenestration holes. Polishing is carried out with a thread or pressure springing with polish and cloth shreds, which is a finicky process.

DRAWINGS

Specific embodiment of the invention will now be described by way of example with reference to the accompanying drawings in which: Figure 1 shows rods embedded in a button preparatory to lathing.

The rods may be placed individually or collectively, in a pattern.

In one embodiment of the invention acrylic rods are embedded in a hydrophilic button and the lens is lathed therefrom.

Figure 2 illustrates the lens after it has been lathed from the button. A is the front radius of the lens, the convex surface which is fabricated to the required power of the lens.

B is the back optic radius of lens which is lathed to conform to the front surface curvature of the eye of the wearer.

The highly polished rod is still embedded at C, D and E, but now in the shape of a disc after lathing. In the event that the rod is made of methyl methacrylate and the material of the lens is hydrophilic then as the hydrophilic swells the acrylate disc will slip out leaving a clean highly polished fenestration hole at F and G. Other combinations of materials can be utilised with similar effect.

Figure 3 is an elevated view of a lens when spheres of a different material are embedded in another material, for example methylmethacrylate spheres in hydrophilic material.

Once the lens is lathed the spheres are reduced to discs which would expel when the process of hydration occurs. This provides a finished lens with circular apertures.

Figure 4 is an elevated view of a lens where ellipses are utilised providing an elongated aperture.

Figures 3 and 4 constitute the skeletal lens, subject of a separate patent.

Figure 5 Shows a mounted needle used for extraneous incandescent heating by a Bunsen burner, similar device or gas ring for the purpose of heat piercing. This needle is attached to a heat resistant wand for hand holding or lathe mounting.

Mounted on wood, for example, this permits ease of dexterity.

(i) Represents the needle.

(ii) A metal heat bank below the needle maintains heat whilst piercing is performed.

Piecing can be performed on a hydrated lens.

Figure 6 shows a needle attached to a heating element for heat piercing a hydrophilic button. An adapted electrical solder iron.

Figure 7 represents an adapted incandescent gas solder iron utilised for this purpose. The heating element of the iron is attached at (i) and sharpened to a needle point (ii). This point is ground to the required aperture size.

Figure 8 shows one method of producing a spin cast lens. Without going into the intricacies of production, one method of producing a spin cast lens is to inject liquid monomers of hydroxethyl methacrylate and ethylene diglycol methacrylate this combination is stored at a temperature of - 5 degrees Centigrade. When injected through a polythene tube at INJ into a rotating female mould, polymerization occurs in a carbon dioxide atmosphere.

By controlling the variables of mould diameter,spin speed and the volume of monomer injected it is possible to produce lenses of differing powers and sizes.

In the figure an upper plate PL has an inner convex curve which corresponds to the required back central optical radius of the proposed lens. The inner surface of the mould becomes the proposed front surface of the lens PFC. FL represents the forming lens. ACR represents acrylate rods which slot into the mould, becoming embedded in the forming lens during the spin casting process. After which the final lens is removed with the embedded rods and is hydrated. During the hydration the hydrogel lens expands and the rods are expelled leaving fenestration holes.

Figure 9 includes the features outlined in figure 8 but also includes representations of circular (CS) and elliptical (OS) removable pegs, either which formation can be utilised in the manufacture of a skeletal lens; these removable pegs become embedded in the forming spin cast lens and, like the rods, expelled during hydration. q

Claims (1)

  1. Alternative methods of making holes and apertures in contact lenses.
    The alternative methods of making holes and apertures of claim 1 is applicable to the production of a lathed lens by placing rods, spheres or shapes of one material bonded to and implanted within another material; one material having a greater expansion ratio than the other when immersed in water so that, during such immersion the materials separate, providing a lens with fenestration holes or apertures.
    A further embodiment of alternative methods of making holes and apertures of claim 1 is the inclusion of rod or peg inserts which are placed in a spin casting device to provide the same end. These become embedded in the forming lens during spin casting and are removed with the lens, separating during immersion in the hydrating process.
    A still further embodiment of alternative methods of making holes and apertures of claim 1 is piercing the lens using a to needle heated to a required temperature.
    This may comprise a separately heated arrangement,such as a needle heated by an external source or an internally heated arrangement. ll
GB0326884A 2003-11-19 2003-11-19 Method of making contact lenses with holes and apertures Withdrawn GB2408230A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0326884A GB2408230A (en) 2003-11-19 2003-11-19 Method of making contact lenses with holes and apertures

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0326884A GB2408230A (en) 2003-11-19 2003-11-19 Method of making contact lenses with holes and apertures

Publications (2)

Publication Number Publication Date
GB0326884D0 GB0326884D0 (en) 2003-12-24
GB2408230A true GB2408230A (en) 2005-05-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB0326884A Withdrawn GB2408230A (en) 2003-11-19 2003-11-19 Method of making contact lenses with holes and apertures

Country Status (1)

Country Link
GB (1) GB2408230A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012104450A1 (en) * 2011-02-04 2012-08-09 Fit And Cover Servilens, S.L. Fenestrated contact lens and method for the production thereof
ES2386790A1 (en) * 2011-02-04 2012-08-30 Fit And Cover Servilens, S.L. Contact lens (Machine-translation by Google Translate, not legally binding)
ES2396101A1 (en) * 2011-07-21 2013-02-19 Fit And Cover Servilens, S.L. "procedure for obtaining a fenestrated contact lens" (Machine-translation by Google Translate, not legally binding)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4171878A (en) * 1974-12-17 1979-10-23 Arbuzova Irina A Combined contact lens
US4659522A (en) * 1982-09-13 1987-04-21 Neefe Charles W Method of spin casting an ophthalmic device with a central aperture
US5104213A (en) * 1989-01-17 1992-04-14 Wolfson Leonard G Polymer buttons having holes therein and contact lenses manufactured therefrom and method of manufacture

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4171878A (en) * 1974-12-17 1979-10-23 Arbuzova Irina A Combined contact lens
US4659522A (en) * 1982-09-13 1987-04-21 Neefe Charles W Method of spin casting an ophthalmic device with a central aperture
US5104213A (en) * 1989-01-17 1992-04-14 Wolfson Leonard G Polymer buttons having holes therein and contact lenses manufactured therefrom and method of manufacture

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012104450A1 (en) * 2011-02-04 2012-08-09 Fit And Cover Servilens, S.L. Fenestrated contact lens and method for the production thereof
ES2386790A1 (en) * 2011-02-04 2012-08-30 Fit And Cover Servilens, S.L. Contact lens (Machine-translation by Google Translate, not legally binding)
ES2396101A1 (en) * 2011-07-21 2013-02-19 Fit And Cover Servilens, S.L. "procedure for obtaining a fenestrated contact lens" (Machine-translation by Google Translate, not legally binding)

Also Published As

Publication number Publication date
GB0326884D0 (en) 2003-12-24

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