A Pencil Drawn Capacitive Sensor used for Liquid Drug Volume Measurement in Syringe Pump

In the field of medical applications, tracking and controlling of liquid drug delivery to the patient body is an important task at the critical stage of treatment. In this paper, a low cost, noninvasive continuous drug volume measurement in a syringe pump has been studied using a pencil-drawn capacitive (PDC) sensor. The drug volume variation inside the syringe injection pump has been measured using the fringing field capacitive method. In this preliminary investigation, the design optimization of the PDC sensor has been studied and observed its performance during the dispense of drugs through a syringe. Experimentally obtained the sensitivity, accuracy, and resolution of the sensor are 0.033pF/mm, ±0.2ml, and 0.1ml respectively.