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CN104470553A 用于透析装置中的超滤控制的单泵校准 有权

用于透析装置中的超滤控制的单泵校准
摘要：
控制单元(30)被布置为控制透析流体分配系统(12)，该透析流体分配系统(12)包括布置在透析仪(13)的上游和下游的第一和第二容积泵(P1，P2)。控制单元(30)可操作在校准模式中，以建立绕过透析仪(13)并从第一泵(P1)延伸到第二泵(P2)且与校准室(26)流体连通的旁通流动路径，并以不同速度组合操作泵(P1，P2)，这导致该室(26)中流体液位的第一和第二变化。第一和第二变化对应于室(26)中的第一和第二已知容积。控制单元(30)通过室(26)中的液位检测器(28)测量第一和第二变化的第一和第二时间段，并作为泵(P1，P2)的速度、第一和第二时间段以及第一和第二已知容积的函数来计算泵(P1，P2)的冲程容积。通过计算冲程容积，控制单元(30)可被操作以通过控制泵(P1，P2)的相对速度来实现透析仪(13)中精确的超滤(UF)速率。
摘要（英）：

A control unit (30) is arranged to control a dialysis fluid distribution system (12) comprising first and second volumetric pumps (PI, P2) arranged upstream and downstream of a dialyzer (13). The control unit (30) is operable in a calibration mode, to establish a bypass flow path that bypasses the dialyzer (13) and extends from the first pump (P1) to the second pump (P2) in fluid communication with a calibration chamber (26) and to operate the pumps (P1, P2) at different combinations of speeds that cause first and second changes in fluid level in the chamber (26). The first and second changes correspond to first and second known volumes in the chamber (26). The control unit (30) measures, by a level detector (28) in the chamber (26), first and second time periods for the first and second changes, and computes the stroke volumes of the pumps (P1, P2) as a function of the speeds of the pumps (PI, P2), the first and second time periods, and the first and second known volumes. By computing the stroke volumes, the control unit (30) is operable to achieve an accurate ultrafiltration (UF) rate in the dialyzer (13) by controlling the relative speeds of the pumps (P1, P2).

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