Vancouver style citation and multiple sentences
I'm not certain whether or not you are technically current about the meaning of a dot after a citation in this particular style.  

What I am certain about, however, is that any such convention is extremely subtle and easy for a reader to misinterpret, both because it's not standard in most styles and because a period is not particularly visually salient.  I would thus strongly suggest using other means, such as how you actually construct your prose, to signal more clearly to the reader which facts belong together as a cited bundle.