Analysis and modeling of capacitive electrodes for insulin dose detection

In this paper, a three-dimensional physical model for the capacitive measurement in an insulin pen used by diabetic persons has been developed. To this purpose, ANSYS Maxwell 3D software has been used to faithfully model an insulin pen and numerically assess the electrode capacitance. A configuration with four electrodes, of given dimensions for their thickness and length, has been chosen for the cap. Consequently, information on the capacitance values between face-to-face electrodes has been obtained. This model can be used to predict the value of the electrode capacitance in many different situations imagined by the designer.