Turn the tables. If instead of using negative pressure in the pump, let say you apply a positive pressure of 6 in Hg (say you have the ability to seal it). If negative pressure is added to cavernosa pressure, than positive pressure must be subtracted. Can you imagine that by adding positive pressure outside the penis that cavernosa pressure would decrease? I can’t.
As in my example of the fluid filled balloon exposed to a negative pressure. The balloon with the fluid will expand and in so doing decrease the pressure of the fluid within. The opposite would occur with positive pressure. Is the cavernosa of the penis different, no matter how small the pressure change might be because of the stiff tunica at peak erection? I don’t think so.
If you add the negative pressure to pressure within the erectile chambers, then instead of inflating a flaccid penis, it would push the blood out. It would have never been a medically approved method for impotence (before Viagra and the other phosphodiesterase-5 inhibitors) if this was the case.
So which way is it? It can’t be both ways. Help me to understand this here.
Pudendum - thanks for the new perspective. I like looking at things from a different angle. I will think about that and answer after a good night’s sleep.
Later - ttt