Hybrid contact lens system and method
Methods of manufacturing hybrid contact lenses using a mold are provided. The methods include pouring liquefied resin of a substantially rigid material within an inner section, curing the substantially rigid material, pouring liquefied resin of a substantially flexible material within an outer section and curing the substantially flexible material. In some embodiments, a wall disposed between the rigid and flexible materials is angled and/or bent to increase bonding strength between the rigid and flexible sections. The curing steps involve the application of heat, UV light, or a combination of both heat and UV light.
1. A method of manufacturing a hybrid contact lens, comprising the steps of:
providing a pre-shape mold having a convex surface and including an inverted bowl-shaped void, the inverted bowl-shaped void comprising a center portion having a convex configuration and an outer portion comprising a channel, the pre-shape mold comprising a base curve mold and a pair of block mold halves, the pre-shape mold defining at least one aperture for filling the channel with a liquefied resin of flexible material, the aperture disposed proximal to an end of the channel;
inserting a pre-formed substantially rigid portion into the center portion of the inverted bowl-shaped void;
injecting a predetermined amount of liquefied resin of flexible material into the channel through the at least one injection aperture such that the liquefied resin flows upward along the convex surface from the end of the channel into contact with a peripheral edge of the pre-formed substantially rigid portion; and
curing the substantially flexible material.
2. The method of claim 1 , wherein the pre-formed substantially rigid portion is pre-coated or pre-treated with an adhesive to promote bonding with the flexible material.
3. The method of claim 1 , wherein the pair of block mold halves are symmetrically disposed about a vertical plane passing through the center of the base curve mold.
4. The method of claim 1 , wherein the pre-shape mold includes a central void dimensioned to permit the substantially rigid portion to be inserted into the center portion of the inverted bowl-shaped void.
5. The method of claim 1 , wherein the materials for the substantially rigid portion are chosen from the group consisting of trimeththyl-siloxyl; methyl-methacrylate; ethyl-methacrylate; ethylene glycol di-methacrylate; octafluoro pentyl-methacrylate; tetra-methyldisiloxane; ethylene glycol di-methacrylate; pentafluoro phenylacrylate; 2-(trimethylsiloxyl)methacrylate; bis(2-metharyloxyphenyl-)propane; N-[2-(N,N-dimethylamino)ethyl]; onethacrylate; N-[2-(n,n-dimethylamino)ethy]; methacryalte; vinyl-pyrolidone; N,N-dimathacrylamide; acrylamine; hydroxyethyl methacrylate; siloxane ethylene glycol di-methacrylate; trifluoroethyl methacrylate; pentafluorostyrene; pentafluoropropyl methacrylate; unsaturated polyester; p-vinyl benzyl hexafluoroisopropyl ether; siloxanylalkylamide; and combinations thereof.
6. The method of claim 1 , wherein the materials for the substantially flexible portion are chosen from the group consisting of: poly HEMA; hydroxyethyl acrylate; dihydroxypropyl methacrylate; polyethylaneglycol; aectoxysilane; trimethylesiloxy; ethyleneglycol-dimethacrylate; phenylethyl acrylate; zero-gel; Silicon-Hydrogel; polyethylene oxide; and combinations thereof.
7. The method of claim 2 , wherein the materials for the adhesive are chosen from the group consisting of: vinylacetate; trifluoroethanol; methacrylate; ethanediamine; 2-hydroxyethylmethacrylate (HEMA) and other esters of methacrylic acid formulated from acrylic bases; fluorine; silicone; fluorine/silicone; styrene and resultant polymers such as polystyrene; fluorine/styrene; silicone/styrene; and combinations thereof.
8. The method of claim 1 , wherein the step of curing the substantially flexible material comprises applying heat, UV light, or a combination of both heat and UV light.