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US 7,022,813 B2Granted
Process for purifying and reusing solvent used to remove extractables
AssigneeBausch & Lomb Incorporated
InventorsMadhu Ayyagari, Erik M. Indra, Mahendra P. Nandu
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Abstract
A process for treating biomedical devices, especially contact lenses, involves contacting polymeric devices containing extractables with a solvent that dissolves and thereby removes the extractables from the device, treating the solvent to remove extractables from the solvent, thereby purifying the solvent, and using the purified solvent to remove additional extractables from polymeric devices.
Claims13
A process for producing a polymeric ophthalmic biomedical device, comprising:
- immersing the device that contains extractables in a bath of organice solvent effective for dissolving said extractables, thereby removing said extractables from said device;
- treating the solvent containing said extractables under conditions effective for removing the extractables from the solvent, thereby purifying said solvent;
- and
- using the purified solvent for removing additional extractables from polymeric ophthalmic biomedical devices.
1 more element
Dependencies are inferred from the claim text.