公开(公告)号：EP3003442A4

公开(公告)日：2016-12-14

申请号：EP14805039

申请日：2014-05-29

申请人： HOSPIRA INC

发明人： DUMAS JOHN H ,  KOTNIK PAUL T ,  SUR KUNAL ,  BELKIN ANATOLY S ,  RUCHTI TIMOTHY L

IPC分类号： A61M5/36 ,  A61M5/142 ,  A61M5/168 ,  G01N29/02 ,  G01N29/34 ,  G01N29/36 ,  H03M1/10

CPC分类号： A61M5/16831 ,  A61M5/142 ,  A61M5/365 ,  A61M2205/3306 ,  A61M2205/3327 ,  A61M2205/3375 ,  A61M2205/52 ,  A61M2205/702 ,  G01N29/02 ,  G01N29/348 ,  G01N29/42 ,  G01N2291/014 ,  G01N2291/02433 ,  H03M1/129

摘要： To detect air in a fluid delivery line of an infusion system, infusion fluid is pumped through a fluid delivery line adjacent to at least one sensor. A signal is transmitted and received using the at least one sensor into and from the fluid delivery line. The at least one sensor is operated, using at least one processor, at a modified frequency which is different than a resonant frequency of the at least one sensor to reduce an amplitude of an output of the signal transmitted from the at least one sensor to a level which is lower than a saturation level of the analog-to-digital converter to avoid over-saturating the analog-to-digital converter. The signal received by the at least one sensor is converted from analog to digital using an analog-to-digital converter. The at least one processor determines whether air is in the fluid delivery line based on the converted digital signal.