Importance

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Abstract

A hemodialysis apparatus includes a sterile filter whose outlet, which is usually closed, is connected to a line leading to a discharge outlet in wherein a bypass valve is employed which can be opened at predetermined intervals both during treatment and during flushing operations. The sterile filter has a primary chamber and a secondary chamber. When the bypass valve is opened during treatment, dialysis solution flows out of the primary chamber of the sterile filter and flushes the pyrogens and particles disposed on the membranes of the filter into the discharge. No sterilizating filtration of the dialysis solution takes place through the pores of the membrane because the flow resistance present in the adjoining dialyzer, in conjunction with a degree of clogging of the pores, prevents such a flow. A ventilation means may be provided whereby the bypass circuit of the sterile filter can be ventilated. The bypass circuit may also be employed for a pressure retaining test.

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First Claim