Systems and methods for producing silicone hydrogel contact...

B - Operations – Transporting – 29 – D

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B29D 11/00 (2006.01)

Patent

CA 2618660

Systems and methods for producing silicone hydrogel contact lenses are described. Certain of the present systems include a contact lens mold forming station, a station for filling a contact lens mold section with a lens precursor composition and for placing a second mold section on the filled mold section to form a contact lens mold assembly, a curing station for forming a contact lens, a mold assembly separation station, and an extraction/hydration station. Certain of the present methods include forming a plurality of mold sections, placing a lens precursor composition on a surface of a first mold section, placing a second mold section on the first mold section, polymerizing the lens precursor composition, separating the first and second mold sections, removing the silicone hydrogel contact lens from one of the mold sections, extracting extractable components from the contact lens, and hydrating the contact lens.

L'invention concerne des systèmes et des méthodes pour produire des lentilles de contact en hydrogel de silicone. Certains systèmes comprennent un poste de formation de moule de lentille de contact, un poste pour remplir la partie de moule de lentille de contact à l'aide d'une composition précurseur de lentille et pour placer une seconde partie de moule sur la partie de moule remplie pour former un assemblage de moule de lentille de contact, un poste de durcissement pour former une lentille de contact, un poste de séparation d'assemblage de moule, et un poste d'extraction/hydratation. Certaines méthodes de l'invention consistent à former une pluralité de parties de moule, à placer une composition précurseur de lentille sur une surface d'une première partie de moule, à placer une seconde partie de moule sur la première partie de moule, à polymériser la composition précurseur de lentille, à séparer la première partie et la seconde partie de moule, à retirer la lentille de contact en hydrogel de silicone d'une des parties de moule, à extraire les composants extractibles de la lentille de contact, et à hydrater cette lentille de contact.

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