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DIFFUSION
            Diffusion is the process which                          Pressure                   Artery
         removes the waste products                 Pump            Monitor                       Vein
         from your blood. Chemicals will
         move across a semi-permeable
         membrane from where they are
         in high concentration to an area
         in which they are in low                                                       Air Trap
         concentration. In your case                                                    and
         ,chemicals are in high                                 Dialyser                Detector
         concentration in your blood and
         in low concentration in the
                                                                                                        Pressure
         dialysate fluid. The semi-
                                                                                                        Monitor
         permeable membrane is either
         the dialyser (Haemodialysis) or
                                              Anticoagulant              Pressure Monitor
         your peritoneum (Peritoneal
         Dialysis).



        ULTRAFILTRATION
           Ultrafiltration is the removal of water from the blood. Ultrafiltration requires an extra force in order to
        remove the fluid. In the case of Peritoneal Dialysis, the glucose in the dialysate provides the extra force.
        The haemodialysis machine is programmed to provide the extra force.

         MAJOR COMPONENTS OF DIALYSIS MACHINE
                                 water
                                    in                   dialyser









                                                                                              to vein




             dialysis fluid
              concentrate





                                                                                                from
                                                                                               artery

                  waste
                    out
                                     fluid unit        membrane                  blood unit









         P.4 Haemodialysis and Peritoneal Dialysis – A Guide for Patients
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