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Anhother doubt that arouse to me:

I have been implanted with 75 cc reservoir. There are two cylinders, 20 cm long, plus 1 cm RTE. 2,1 cm diameter each. Volume of one cylinder is Diameter multiplied by Pi multiplied by lenght. That give the following result:

75/2 = 37,5 cc for each cylynder.
With 2,1 cm diameter, the lengh cannot be more than 5,7 cm.

Something doesn't match here.

The RTEs don’t fill with fluid, not the entire cylinders fill with fluid. They are tapered at each end so you can’t use the formula for cylindrical volume.

Thank you for the clarification. I knew something like that should occur, if not, it would be impossible.

I cannot understand the lack of information there is about this. Or at least, I am not able to find it.

oneperson wrote:Thank you for the clarification. I knew something like that should occur, if not, it would be impossible.

I cannot understand the lack of information there is about this. Or at least, I am not able to find it.

there's always some fluid that remains in the cylinders and the rest of the system as well, the cylinder isn't at zero when you start pumping, a tightly filled smaller reservoir can also help make pumping faster / easier - at least up to semi hard, since pressure from the reservoir helps push fluid to the cylinder once the one way valve disengages