Sensors are described that may be provided in a medication pump. A light sensor may be provided that detects if a cartridge is present in a cartridge chamber. A medication cartridge includes an opaque area at its open end for use with the light sensor....http://www.google.fr/patents/US7442186?utm_source=gb-gplus-shareBrevet US7442186 - Syringe pump control systems using a light sensor
