I was told because it HAD to be in the muscle. (I.M.) like you said. That would be SO awesome if we could. I even purchased one in hopes I could use it when my daughter was little but with the needle I had it wasn’t equipped to handle that type of needle. BUT the nurse said I could but she wasn’t too sure on how good it would be, because it had to be in the muscle. (nurse no longer works for endo. for CAH anymore mind you)  I am still going to ask the new nurse since you brought it up. But I think the answer will still be no. The one I purchase had different size spacers. I can’t really explain it any better. I will let you know what I find out.