Pen, has inflatable holder for refill, preferably insertable only when holder is inflated via sealable opening in holder

摘要

The holder (3) for the refill (2) can be inflated so that it has an active state. The refill can only be inserted into the pen when the holder is inflated. A sealable opening (5) in the holder is used to inflate it. An element (6) provided with e.g. advertising is insertable into the holder and has a larger diameter than it.