Chapter 7: Functional description
Fresenius Medical Care multiFiltrate IFU-EN-UK 15A-2015 7-1
7 Functional description
7.1 Device functions
Extracorporeal blood
circuit
The device features a pump-controlled extracorporeal blood circuit. The
extracorporeal blood circuit is monitored during the treatment.
Balancing Filtrate, dialysate, and substituate are transported by roller pumps.
Gravimetric balancing is done with four separate scales used to weigh
and balance the substituate, dialysate, and filtrate volume. The two
integrated heaters reliably control the set treatment temperature, even
at high dialysate and substituate flow rates.
Alarms / warnings Alarms will stop the device. Typical reasons for alarms are potentially
hazardous conditions in the extracorporeal blood circuit, e.g., pressure
increases.
In case of warnings, the extracorporeal blood circuit is maintained but
the balancing pumps are stopped. Typical reasons for warnings are
potentially hazardous conditions in the balancing system,
e.g., unexpected change of the weight on one of the scales.
Handling The operating concept with its clear menu structure allows for easy
operation. Treatment parameters and softkeys are displayed on a large
screen. The device is operated with a rotary selector and additional
keys, e.g., to select fields displayed on the screen.
Functional test An automatic functional test which checks all relevant operating,
display, monitoring, and alarm functions, will be initiated every time the
device is turned on.
Regional anticoagulation
with citrate
The optional Ci-Ca function of the system makes it possible to
anticoagulate the patient’s blood in the extracorporeal circuit with citrate
during a CVVHD treatment (continuous venovenous haemodialysis;
Ci-Ca CVVHD) and a Post CVVHDF treatment (continuous venovenous
haemodiafiltration; Ci-Ca postCVVHDF). Anticoagulation of the
patient’s blood is achieved by adding citrate solution to the arterial
access line. During a Ci-Ca treatment, a significant amount of calcium
is removed from the patient's blood. For this reason, a calcium
substituate is infused into the venous return line by the integrated
calcium pump.
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