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In most of these trials, participants wore the devices for between 4 and 6 hours a day. In one, they wore the devices for 9 hours a day. Researchers are also investigating whether using traction devices before or after penile surgery could improve outcomes. The evidence concerning traction devices is, however, limited. Determining their safety and effectiveness will require more research, and the Urology Care Foundation currently does not support their use. A vacuum device contains a tube that fits over the Penis. Pumping out air creates a vacuum that draws blood into the penis, causing it to swell.

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