According to my Fundamentals text Potter and Perry (p. 886 3rd edition, Canadian edition), it explains that you are not supposed to allow the needle tip of the shaft to touch the rim of the ampule. (I wonder if that means I can still let the needle touch the sides once it is inside the solution in the ampule? Apparently the rationale being that the broken rim of the ampule is contaminated. Easier said than done!!!
As for touching the barrel, according to page 881 of the text, it states that "to maintain sterility, the nurse avoids letting any unsterile object touch the tip or the inside of the barrel, the hub or shaft of the plunger or the needle" and then it has a little picture of the barrel and it says "avoid touching".
So.......go figure??? I know that as a student I will probably be pretty nervous the first time I ever draw a med and heaven forbid if I accidentally touch anything!!.
I don't know, I am just studying my notes here and that is what I am being told.