Patent ID: 8281656
Filing Date: 2012-10-09
Classification: A61J,A61M,G01F

Abstract:
1. A cartridge with a fill level detection system, the cartridge comprising a substantially rigid containing wall having a tubular wall portion surrounding a chamber for receiving fluid therein, a plunger or piston mounted inside the chamber and configured to seal one side of the chamber, the plunger or piston being displaceable in the chamber towards an outlet end of the cartridge, wherein the fill level detection system comprises a plurality of discrete fixed electrodes positioned along the tubular wall portion in a juxtaposed manner in a direction of displacement D of the plunger or piston, and a mobile discrete electrode member fixed to the plunger or piston and displaceable therewith, the average thickness (t) of the mobile discrete electrode member in the direction of displacement of the mobile electrode member being equal to, or less than, two times a spacing (s) between adjacent said discrete fixed electrodes.