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US 5,628,959 AGranted
Composition and methods for sterilizing dialyzers
AssigneeAlcide Corporation
InventorRobert D. Kross
Life of this patent
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AssigneeAlcide Corporation
InventorRobert D. Kross
Estimating the term…
Compositions and methods are provided for sterilizing hemodialysis apparatus, particularly for reprocessing dialyzers in a manner that minimizes membrane perforations. The compositions contain a protic acid and a metal chlorite, and have a pH of at least about 2.3 and no greater than 4.2. Methods of this invention include contacting both the blood side and the dialysate side of a dialysis membrane with the composition, followed by first displacing the composition on the dialysate side with water or an aqueous alkali buffer having a pH in excess of about 6.0, such that the pH of the composition on the blood side of the dialysis membrane increases to at least about 5.0. The composition on the blood side is then displaced with saline. In a further embodiment, the composition has a pH ranging from 3.3 to 4.2, and the amount of chlorite ion in the form of chlorous acid ranges from 0.5% to 5.0% by weight of the total amount of chlorite ion in the composition. In this embodiment, the composition may be employed without associated membrane degradation by using existing hemodialysis set-up techniques, except that dialysate displacement on the dialysate side precedes saline displacement of blood side.
A method for disinfecting a dual-chamber hemodialyzer having a blood side and a dialysate side separated by a dialysis membrane, wherein the membrane has a blood contact surface and a dialysate contact surface, comprising:
A method for disinfecting a dual-chamber hemodialyzer having a blood side and a dialysate side separated by a dialysis membrane, wherein the membrane has a blood contact surface and a dialysate contact surface, comprising:
A method for disinfecting a dual-chamber hemodialyzer having a blood side and a dialysate side separated by a dialysis membrane, wherein the membrane has a blood contact surface and a dialysate contact surface, comprising:
Dependencies are inferred from the claim text.