Abstract: A system using a radioisotope concentrator device comprising a body having at least one injection port and at least one valve being configurable between a first open configuration for allowing fluid communication between the at least one injection port and the concentrator column and a second open configuration to prevent fluid communication between the at least one injection port and the concentrator column in use, the system further comprising an injection device comprising an eluent for eluting through the concentrator column via the at least one injection port when the at least one valve of the radioisotope concentrator device is in a selected open configuration in use.

Abstract: A hemodialysis apparatus separates constituents from blood plasma utilizing layered gel membranes of differing permeabilities configured as a U-tube. Physical filter pressing of blood plasma is accomplished by pinching gel beds along the U-tube axis where localized pressure rise and centrifugal forces are established. The U-tube fold also establishes chemical countercurrent pumping across the gel beds. Capillary and electroosmotic gel filtration further accomplishes selective chemical removal and readsorption.