Sounds like it might be the mega cartomizer.
Cone shaped, plastic, whistle tipped? Pop the tip off and then another plastic piece (has 2 holes) to pop out. Put paperclip in to puncture through foil and fill with syringe. Look
here and see if that is what it is.
After reading the site-they are prefilled-so you won't have to worry with the first fill or popping through the foil.