Driving device for linear movement of the injection syringe piston, a method for replacing an infusion pump, and infusion syringes

摘要

The present invention relates to a driving device for the injection syringe piston of the injection pump (2) injecting syringe that is disposed on the (5) (4) is allowed to linearly move (1). Infusion pump (2) comprises a main bearing means for supporting an injection syringe piston (4) (17), fixing means for fixing the injection syringe piston (4) relative to the main bearing means (17) (20) and, and means (21) for starting the fixing means (20) comprises a drive head unit (3) further includes an electric advanceable spindle (8), at least one radially and a multi-part mold forward spindle nut having a movable nut shells (12, 13) (9), and an advancing means for the drive head unit (1) (6). Drive head unit (3) further comprises a detection means (23) for detecting the front of the injection syringe piston of the main bearing means (17) (4). Detecting means (23), - multiple thresholds sensor comprising at least two-stage upstream detecting means (28) for detecting the various positions in front of the injection syringe piston (4) of the main bearing means (17) unit it is provided (24).