Fecha de publicación: -- Fuente: Wipo "Sensorization" An apparatus is provided for monitoring a predetermined parameter of a patient's body fluid while infusing an infusion fluid into the patient (6011). The apparatus comprises an infusion line (6017) and a catheter (6021) configured for insertion into a blood vessel of the patient, and a reversible infusion pump (6013) connected between a source (6015) of an infusion fluid and the infusion line and catheter. The apparatus further comprises a body fluid sensor assembly (6019) mounted in fluid communication with the infusion line and which includes a first sensor and a sample cell. The first sensor provides a signal indicative of a predetermined parameter of any fluid present in the infusion line. The apparatus further comprises a controller (6023) that is configured to operate the infusion pump in a forward direction so as to pump the infusion fluid through the infusion line and catheter for infusion into the patient. The controller is configured to intermittently interrupt its operating of the infusion pump in the forward direction to operate the infusion pump in a rearward direction so as to draw a body fluid sample from the patient through the catheter and infusion line. The controller, in response to detecting the arrival of the body fluid sample at the first sensor, is configured to cease its operating of the infusion pump in the rearward direction.