An improved pump, reservoir and reservoir piston are provided for controlled delivery of fluids. A motor is operably coupled to a drive member, such as a drive screw, which is adapted to advance a plunger slide in response to operation of the motor. The plunger slide is removably coupled to the piston....http://www.google.de/patents/US20040085215?utm_source=gb-gplus-sharePatent US20040085215 - Method and apparatus for detecting errors, fluid pressure, and occlusions in an ambulatory infusion pump
