In Germany there is a medical dissertation on masturbation injuries with vaccum cleaners. It is no joke, serious research, but became famous when a comedian did a stage show reading from the study. The text is available on the internet, for those of you who can read German: http://brennessel.blogsport.de/images/DOKTORARBEIT_Penisverletzungen_bei_Masturbation_mit_Staubsaugern.pdf
Maybe worth noting that the literal translation of the German for vaccum cleaner "Staubsauger" is "dust sucker". Nevertheless, the device is not constructed to suck your d***.
The study only discusses penis injuries. There is nothing on the effect of a vaccum cleaner on a clitoris.