Ampoule recognition

An ampoule for an injection or infusion apparatus, said ampoule comprising:

• a threaded surface parallel to a central longitudinal axis extending between a dispensing end and a distal end of said ampoule, said threaded surface providing a predetermined orientation of said ampoule when said threaded surface is engaged with an administering device, said distal end comprising a surface perpendicular to the axis;
• at least four available predetermined recognition element positions positioned along a first radius extending radially on the perpendicular surface about the longitudinal axis;
• at least two recognition elements each positioned in one of the at least four predetermined recognition element positions;
• wherein each of the predetermined recognition element positions is positioned asymetrically along the first radius such that the circumferential distance between any two positions is different than the circumferential distance between any other two positions,
• wherein the number of available predetermined recognition element positions is greater than the number of recognition elements, and
• wherein the recognition elements are positioned in the predetermined element recognition positions such that detection of the positions of the recognition elements enables recognition of the ampoule;
• and
• a reference recognition element positioned along a second radius extending radially on the perpendicular surface about the longitudinal axis, the first and second radii having different lengths, wherein the reference recognition element enables detection of the positions of the recognition elements while the ampoule is rotated.