They’ve innovated a few different types of weapons for him, including his hook, but this hasn’t occurred to them. Normally they stick to stuff that’s more useful against the monsters they hunt– Silver, iron, salt and such. This kind of thing would be more useful against rodents and people, and Sam’s grown used to his knife for defense.
(Legos are a form of torture implement)
I don’t want to give away too much of the stories, but even if Sam doesn’t have to fix Dean up in Brothers Apart, he’ll definitely be helping that big brother of his out in one AU or the other. He’s not as medically trained as Dean is by simple fact that Dean’s had to be able to stitch himself or his dad up since childhood, but Sam did learn some basic first aid from both Walt and Dean.
Brothers Apart 