my wife has just started taking Forteo injections for her osteoporosis, bone replacement. Today is only the second day for the injection and i have a question, concerning removing the needle from the medicine cartridge (syringe). When i unscrewed the needle from the cartridge, I don t know if I was too forceful, because the plastic collar came out with the needle itself. Is that the way it should be? I.e, when I prepare a new injection tomorrow, will there be another plastic collar around the needle, so that I can screw the new needle into the cartridge? Does this happen each time? Thank you for your help.