does anyone know if there is a difference between the human hypo's and the animal hypo's?
I'm not aware of any company that produces needles specifically for use on animals. Any time I've ever been to the vet, they use the exact same BD brand needles you'd see at a hospital.
I'm sure it's quite possible that there are companies that make needles specifically for vetrinary use, but I would assume this is simply because in some cases the needles would need to be of gauges larger than you would use on a human.
At any rate, nobody is going to make a dull needle. Human use or not.
The only thing that matters is the gauge and length of the needle, not if it's intended for use on animals or not.
However, BD makes the highest quality needles. Less chance of getting something with a barb on it and BD will typically stay sharper longer than other brands. So if you can get BD 29 gauges, you should get those instead of trying to save money. But it shouldn't make THAT much of a difference either way.
And as others have said, do not use anything larger than a 26 gauge needle for IV drug use.
For IV, I wouldn't go below 26. They use 21 g for drawing blood often, but 'they' are trained professionals and they only target very large veins.
As far as I'm concerned, trained or not, these "professionals" are usually not very good at giving injections and leave you with bruises and crap. I can only recall one phlembotomist giving me a decent injection.
in the f.a.q. it says "they also make a "short needle" version of the Ultra-Fine, YOU DON'T WANT THIS! I will explain why later.." but it's never really explained later. why do you not want these, how short are they, and what is the recomended needle length?
Because even though a vein might look as though it's right underneath the surface of the skin, they're usually deeper than they look.
If you use a short needle, it's much more difficult to get into the vein and you stand a good chance of the needle coming out of the vein while you're injecting and getting a bubble under your skin.
It's not impossible to give yourself an injection with a short needle, I've done it before. But it's difficult and can be dangerous if you miss the vein.