A clinical analyzer moves a stack of slide or cup-like test elements into position for dispensing by a plunger and a driver featuring a housing around the plunger, a spring for biasing the plunger to project beyond the housing, a connection between the housing and the driver, and two sensors. The first...http://www.google.fr/patents/US5271896?utm_source=gb-gplus-shareBrevet US5271896 - Plunger and driver mechanism for an analyzer
