A new development at Business Unit MICROrun® of PARItec GmbH concentrates on micro dosing. The application is a novel method to facilitate early diagnosis of colon cancer. Via an endoscope a few µ litre of a novel optical label are injected in vivo into the tumor. The injection system has to overcome a 200 cm long tube maintaining the precesion. The concept, feasibility and the development of this novel micro dosing system are carried out by MICROrun®. First tests with functional models were very promising. Besides several versions of micro pump O-run® BU MICROrun® offers development of customized micro fluidic components and complete systems.