Hemodialysis with sodium bicarbonate dialysate prepared in plural stages
First Claim
1. In a dialysis process in which blood is withdrawn from a patient, passed over one surface of a semipermeable membrane and returned to the patient in a purified state while an aqueous dialysate fluid containing dissolved sodium salts including sodium bicarbonate is passed over the opposite surface of said membrane, the improvement wherein said sodium bicarbonate is generated just prior to said passage over said membrane surface by the interaction of a stream of an aqueous solution containing dissolved sodium carbonate and a stream of an aqueous solution containing a dissolved acid of the group consisting of hydrochloric acid, acetic acid and mixtures thereof, said streams interacting in a first stage in which a stoichiometric excess of acid is provided and in at least one additional stage in which additional aqueous sodium carbonate solution is provided.
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Accused Products
Abstract
A dialysate solution containing sodium bicarbonate is provided in which the sodium bicarbonate is generated just prior to dialysis by combining an aqueous sodium carbonate-containing stream with an aqueous stream containing hydrochloric acid, acetic acid or a mixture of these acids in at least two stages with an excess of acid in the first stage.
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Citations
11 Claims
- 1. In a dialysis process in which blood is withdrawn from a patient, passed over one surface of a semipermeable membrane and returned to the patient in a purified state while an aqueous dialysate fluid containing dissolved sodium salts including sodium bicarbonate is passed over the opposite surface of said membrane, the improvement wherein said sodium bicarbonate is generated just prior to said passage over said membrane surface by the interaction of a stream of an aqueous solution containing dissolved sodium carbonate and a stream of an aqueous solution containing a dissolved acid of the group consisting of hydrochloric acid, acetic acid and mixtures thereof, said streams interacting in a first stage in which a stoichiometric excess of acid is provided and in at least one additional stage in which additional aqueous sodium carbonate solution is provided.
Specification