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Chapter 13: Definitions
Calcium rate
Citrate pump
Citrate dose
Citrate flow
Citrate rate
Dialysate
Diffusion
Insertion switch
Extracorporeal circuit
Filtrate bag
Filter life
Filtration
Haemodialysis
Haemofiltration
Heparin pump
(anticoagulant pump)
Convection
ME device
Non-ME device
Postdilution
13-2
(see Calcium flow on page 13-1)
The citrate pump is used for adding citrate solution to the patient's
blood.
The citrate dose is the volume of citrate solution added to the patient's
blood in relation to the blood flow. The dose is specified in mmol per litre
of blood.
The citrate flow is the volume of citrate solution supplied to the patient's
blood per time unit.
(see Citrate flow on page 13-2)
Dialysate is the fluid used in haemodialysis that flows countercurrent to
the blood and is separated from the blood only by a filter membrane.
Diffusion is the term used to describe the change in concentration of the
solutes as they are transported in the solutions.
The insertion switches are provided in the pump beds of the citrate and
calcium pumps. The system uses the insertion switches to detect
whether or not the respective Ci-Ca tube pump segments have been
correctly inserted.
The extracorporeal circuit is the section of the blood circuit outside the
body.
The filtrate bag is the collection bag for the filtrate (ultrafiltrate).
The filter life is the total time during which the blood pump is running.
Filtration is the convective flow of solutes, e.g., water, across a
membrane, which occurs in response to a hydrostatic and / or osmotic
pressure gradient. Dissolved particles are also carried along
(convective transport) if they are not retained by the membrane.
Haemodialysis is the diffusive exchange process between the dialysate
and the blood in an extracorporeal circuit.
Haemofiltration is the ultrafiltration of plasma water and its solutes to
eliminate endogenous and exogenous toxins and water while
simultaneously replacing the ultrafiltrate with appropriate amounts of
electrolyte solution.
The heparin pump is used for adding the heparin anticoagulant to the
patient's blood in the blood circuit.
Convection describes the transport of solutes together with the solvent
(drag effect, e.g., haemofiltration).
Medical electrical device.
Non-medical electrical device.
Adding substituate downstream of the haemofilter.
Fresenius Medical Care multiFiltrate IFU-EN-UK 15A-2015
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