Improvements in the object of the principal patent No. 409,326, filed on December 5, 1972: method and apparatus for the precise adjustment of the ultrafiltration rate of a hemodialyzer in particular an artificial kidney for hemodialysis open circuit, characterized because homodializador is it operate temporarily closed with constant internal volume circuit, the ultrafiltration flow rate to the desired value is adjusted removing liquid circuit at the same flow rate, the depression which then exists in the circuit near the hemodialyzer is logged and the operation is restored open circuit depression regulating the noted value.
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