30 minutes at 6"Hg: no edema. Went back to 5" because I pump my balls separately, and they don’t like 6". Adjusting the craptastic needle valve (plastic, and sticky) is a tedious hassle involving multiple attempts to set the vacuum, so I said to hell with it and went back to 5".
30 minutes at 5"Hg: no edema
30 minutes at 5"Hg: thermostatic heating pad at 110F: slight edema
30 minutes at 5" Hg: heating pad only for first 15 minutes: no edema
45 minutes at 5"Hg: edema
45 minutes at 5"Hg: as three 15-minute sessions, 10 min. apart: slight edema
45 minutes at 5"Hg: as above, heating pad first 15-minute session: slight edema
45 minutes at 4"Hg: as three 15-minute sessions, 10 min. apart: very slight edema
30 minutes at 4"Hg: thermostatic heating pad at 110F whole session: no edema
If I pump to edema while cold, it’s primarily between the circimcusion scar and sulcus, soft, and goes away in an hour or two. If I do it with the heating pad, it’s spread out along the shaft, and stays firm most of the day.
110F is the most I can take before wimping out from discomfort. Bumping it to 112F not only hurts, it leaves my feeling burned for the rest of the day. Since it’s a heating pad and not ultrasound, that’s surface temperature only.
I went to a 2x9" tube a couple of months ago, down from the 2-1/8" I was using, because my girth is over 6" and I don’t want any more. I’m using a Spectra S2 breast pump as a vacuum source, with a bleeder valve and a vacuum gauge. I started with an older S2, which worked on 20 minute cycles, and wouldn’t ever pull more than 4"Hg. The new one runs for 30 minute cycles, and will pull 17"Hg with the bleeder closed. In between, I used a Tetra aquarium pump, which finally wore out.
With the bleeder valve the pulsing of the S2 runs up and down between 3 and 5"Hg. When I say ‘5"’ I’m referring to the peak vacuum, not the average. So I’m actually pulling less average vacuum with the S2 than the Tetra. My logs don’t show any effective difference between intermittent and continuous vacuum, but the intermittent feels better. Downside: the Tetra pump was small, and the S2 is the size of a pumpkin and fugly.