Liquid purification or separation – Flow – fluid pressure or material level – responsive – Maintaining stream pressure or flow
Patent
1977-07-12
1980-06-24
Spear, Jr., Frank A.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Maintaining stream pressure or flow
134 95, 210140, 210321B, 210356, B01D 3100
Patent
active
042094020
ABSTRACT:
Kidney dialysis filters, or artificial kidneys, which contain a dialysis membrane mounted inside a housing and separating the housing into a blood side compartment and dialysate side compartment are washed for reuse by a process in which washing water is supplied to the blood side through an inlet hose, and exits through a remote, resiliently expandable and contractable outlet hose to a drain. After flushing of the blood side by water flow in this manner, the outlet is closed while continuing washing fluid feed, to build up fluid pressure inside the blood compartment, and then the fluid feed is interrupted. A drain in the inlet conduit is then opened to cause brief reversal of flow of fluid within the blood side, due to relaxation of the membrane and the outlet hose to relieve the fluid pressure. Then steady flow of fluid is resumed. This brief reversal of flow causes a fluid action to dislodge contaminating blood particles from the membrane and elsewhere.
REFERENCES:
patent: 3441035 (1969-04-01), Edwards
patent: 3450263 (1969-06-01), Dambrine et al.
patent: 3834535 (1974-09-01), Portyrata
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