Method for making ophthalmic devices

B - Operations – Transporting – 29 – C

Patent

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B29C 67/00 (2006.01) C08G 18/62 (2006.01) C08G 18/67 (2006.01) C08G 71/00 (2006.01) C08L 75/16 (2006.01) G02B 1/04 (2006.01)

Patent

CA 2494618

The present invention provides a method for producing an ophthalmic device by means of stereolithography. The method comprises the steps of: depositing (i) an essentially solvent-free liquid or melt of a device-forming material, or (ii) a solution of said device-forming material, into a container wherein said device-forming material is crosslinkable or polymerizable by actinic radiation; irradiating said device forming material with one or more activation energy beams to obtain a cured layer of polymerized or crosslinked device-forming material; irradiating said device-forming material with said one or more activation energy beams to obtain a cured layer on top of a previously cured layer; and repeating step (c) to obtain additional cured layers until said ophthalmic device is created integrally, wherein each of cured layers corresponds to a pertinent slice of said ophthalmic device.

La présente invention porte sur un procédé de fabrication d'un dispositif ophtalmique par stéréolithographie. Le procédé consiste à: déposer dans un réceptacle (i) un liquide ou substance fondue essentiellement exempt de solvant d'un matériau permettant de former le dispositif ou (ii) une solution de ce matériau permettant de former le dispositif et qui est réticulable ou polymérisable par rayonnement actinique; irradier ce matériau formant le dispositif avec un ou plusieurs faisceaux d'énergie d'activation pour obtenir une couche durcie du matériau polymérisé ou réticulé formant le dispositif; irradier ce matériau formant le dispositif avec un ou plusieurs faisceaux d'énergie d'activation pour former une couche durcie sur la couche précédente; et répéter l'étape (c) pour obtenir des couches durcies additionnelles jusqu'à la formation intégrale du dispositif ophtalmique, chacune des couches durcies correspondant à une rondelle propre du dispositif ophtalmique.

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