2 . T e c h n i c a l System Description
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BA-TE-DE08C M.KAY
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B. Braun Avitum AG
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SW 9.xx
2.20.8
Ultrafiltration and Rinsing Bridge
The main flow path and bypass have the following components:
•
Dialyser Inlet Throttle DDE
DDE
DDE
DDE
•
Dialyser Inlet Valve VDE
VDE
VDE
VDE
•
Dialyser Outlet Valve VDA
VDA
VDA
VDA
•
Bypass Valve VBP
VBP
VBP
VBP
•
Outlet Flow Pump FPA
FPA
FPA
FPA
The flow path for the main flow and bypass are determined by the valves VDE,
VDA and VBP. The built up flow from the flow pump FPA is stabilised by the
throttle DDE. Valves VDE and VBP are closed for sequential therapy
(ultrafiltration without dialysate fluid flow). The ultrafiltrate removal is carried
out by the ultrafiltration pump UFP.
Further components are:
•
Red sensitive blood leak detector BL
•
Pressure sensor PDA which monitors the dialysate pressure (also used to
calculate TMP)
•
Air separator LA with built in level sensors LAFS and air separator valve VLA
•
Throttle RVDA functions as a resistance to stabilise the flow of FPE
The throttle RVFPA prevents a high pressure build-up and thus a bursting of
tubing if the flow path is blocked behind FPA. If the set pressure is reached
RVFPA is opened and the fluid can circulate.
Detection of Air in Air Separator LA
If air is detected in the air separator LA by the air separator level sensors LAFS,
the balance chamber switches to free flow:
•
VEBK1 and VDEBK2
opened
•
VABK1/2 and VDABK1/2
closed
VLA is opened and air is removed with positive pressure from LA. VLA is closed
once air is not detected anymore by LAFS. The balance chamber is switched to
normal operation.