Blunt ends are readily available for syringes. A normal syringe has a diagonal cut on the hollow needle, milled to be very sharp. A blunt is square cut and milled to round out sharp edges. It will not penetrate skin unless you use such extreme force as to probably bend the needle. You can then fill the interior of the needle with epoxy.
That syringe ...
It is Medal of Yavin.
At the end of A New Hope, Han and Luke got medals for their role in the Battle of Yavin, but Chewbacca didn't.
This medal belongs to Han, which Leia was holding.
From Star Wars Databank,
While most rebels consider opposing the Empire its own reward, the Alliance’s leaders do recognize conspicuous gallantry. For ...
It's a Medals of Bravery aka Medal of Yavin.
The Medal of Bravery was an award given for heroic efforts by the Rebel Alliance.
Also Luke and Han with already got it in A New Hope but we didn't see Chewie getting it but in comics, it was made clear he got it and he gave it away ( from screenrant) :
From the same link:
While the medal in question isn't ...