Ampoule unit with adapter

摘要

The unit has an ampoule (1) comprising a distal end with an opening (10) for dispensing a fluid product and a proximal end with an opening for accommodating a displacement body or displacement body unit. An adapter (4) is connected with the ampoule, and the proximal end has a thread (4a) that is brought into a thread engagement with a complementary thread, which is part of the displacement body or unit. A piston unit (2) has a piston that is made from elastic material and seals the ampoule in a proximal direction, where the piston has a concave form along the circumference.