摘要:
The present invention, in one embodiment, is a process for extracting pre-polymer from a polymer lens. The process of one embodiment comprises the step of contacting the ophthalmic lens with a super-cooled solvent for a period of time sufficient to extract pre-polymer from the polymer lens.
摘要:
The present invention includes without limitation a process for separating a hydrogel contact lens from at least one mold half selected from the group comprising the anterior half and the posterior half of a contact lens. The process comprising the step of contacting either the contact lens or the one half with a maximum of about 1000 μl of a super-cooled fluid to create a temperature differential between the contact lens and the one half.
摘要:
The present invention is a process for extracting pre-polymer from a polymer lens. The process comprises the step of contacting the lens with a super-cooled solvent for a period of time to increase the modulus of the contact lens. Thereafter the contact lens undergoes additional dry processing steps. By way of example, the dry processing steps include but are not limited to surface treatment, lens coating and polishing and/or edging of the contact lens.
摘要:
The present invention includes a process for cleaning a mold or mold half comprising contacting the mold or mold half with a super-cooled fluid under conditions effective to clean the mold or mold half.
摘要:
The present invention is a process for extracting pre-polymer from a polymer lens. The process comprises the step of contacting the lens with a super-cooled solvent for a period of time sufficient to extract pre-polymer from the polymer lens.
摘要:
An apparatus for releasing a molded lens from a deformable mold includes a shear ring for temporarily retaining an annular portion of the deformable mold outside a periphery of the lens and a plunger for deforming an annular section of the deformable mold within the periphery of the lens. The apparatus can be employed to release a non-hydrated hydrogel lens from a deformable mold section.
摘要:
A method involves providing a monomer mixture comprising a biomedical device-forming monomer and a UV absorbing agent; and exposing the monomer mixture to an electron beam to cure the monomer mixture.
摘要:
The present invention includes a process for cleaning an optical tool for manufacturing contact lens molds comprising contacting the optical tool with a super-cooled fluid under conditions effective to clean the optical tool.
摘要:
A process for treating biomedical devices, especially contact lenses, involves contacting polymeric devices containing extractables with a solvent that dissolves and removes the extractables from the devices. The devices are subjected to at least two treatments with solvent to remove extractables in the devices. One of the treatment steps involves solvent used as a final rinse for a prior batch of devices. The solvent may be circulated through a series of tanks, in which case the devices are first extracted in the downstream tanks, followed by extraction in the first tank containing fresh incoming solvent.
摘要:
A method for preventing or reducing interaction between a container and a polymeric article contained therein comprises oxidizing a surface of the polymeric article. The method is advantageously used to package ophthalmic devices in polymeric containers.