COMPOSITION AND METHOD FOR MANUFACTURING CURATIVE SOFT CONTACT LENS Russian patent published in 2005 - IPC

FIELD: medicine, ophthalmology.

SUBSTANCE: the suggested composition includes gelatin, glucose, hydroxide of alkaline metal, distilled water at certain ratios. As hydroxide of alkaline metal one should apply sodium hydroxides (NaOH), potassium hydroxides (KOH) or lithium hydroxides (LiOH). Composition should be prepared due to adding gelatin into aqueous glucose solution to obtain homogeneous solution, then one should supplement hydroxide of alkaline metal as 3 M aqueous solution, pH of composition is increased up to 10.5-11.5. The obtained composition should be heated at hot water bath for 2-3 min at 94-98 C, then it should be cooled with cold water for 3-5 min up to 20 C. Heating and cooling cycle should be repeated 4-6 times. On finishing the process composition's pH is decreased up to 7.5-8.5. Composition should be poured into vials to be dried and kept at room temperature. The process lasts for 5-7 d. The obtained curative, soft contact lens should be sterilized by placing them together with the form for 1 h into 96°-ethanol solution, to be dried by not separating against the form and stored in dry sealed vials out of dark glass. Before application lens should be impregnated in isotonic solution of sodium chloride (NaCl) for swelling to separate then against the form and rinsed 4-5 times in 0.9%-NaCl solution. The innovation provides efficient ocular protection in case of burns, traumas and chronic diseases.

EFFECT: higher efficiency of manufacturing and application.

3 cl, 3 ex