Erectily dysfunction and vacuum pump??

Hi, I have tried vaccum pump three years ago and have been using it since than, whenever I experience erectile disfunction. Vacuum Pump contains of the external vacuum device, that looks like a clear plastic cylinder, a vacuum pump and a tension ring. It works by drawing blood into the penis, after it is putted over it. The function of a tension ring is to trap blood inside the penis and maintain the erection. Occasional, reddish pinpoint dots (petechiae) or bruising (ecchymosis) on the penis is possible to get from the negative pressure of the vacuum pump. it is safer then Viagra, since it doesn’t affect heart and acts only locally.