Vacuum devices work by bringing more blood into the penis and then trapping it. The penis is inserted into a hollow plastic tube, which is pressed against the body to form a seal. A vacuum is created in the tube by the use of a small hand pump. This, in turn, draws blood into the penis, causing the penis to engorge, enlarge and become rigid. After one to three minutes in the vacuum, an adequate erection is created and a soft rubber O-ring is then placed around the base of the penis to trap blood and maintain the erection.
Sexual intercourse can occur after the vacuum tube is removed.
The rubber O-ring maintains the erection until removed. Generally, it can be left in place for 25 to 30 minutes. The vacuum device can be used any time at a patient's convenience. Another major advantage is safety. There is no surgery involved and there are no injections or significant side effects.