"Closed System" does not equal "Multiple User"
I can't find a specific link for this but my understanding is that while all multiple user pumps are "closed systems", what determines their FDA multiple user status is the fact that their motors can be sterilized.
The Ameda Hollister "Purely Yours (PY)" is a closed system by virtue of its "Hygenikit" collection kit.http://www.hollister.com/us/mbc/brea...g/default.html
"The kit’s unique silicone diaphragm acts as a barrier, separating the user from the suction source. This helps ensure milk purity by preventing contaminants from coming in contact with collected breast milk and prevents milk back-up so tubing and pump require little to no maintenance."
So, the question is, why bother with a closed system for a single user product? The first thing that comes to mind is thrush (yeast infections) or any other sort of treatable infection that could possibly recur due to a contaminated pump. Also, unlike with the Medela pumps, you shouldn't have to dry the tubes out. Which saves precious time on the pumping routine. This is especially important for Moms pumping in the work place.
As stringent as the FDA's sterilization requirement for mulitple user pumps may seem, it makes sense to me because the silicone diaphragm probably isn't completely fool proof. Additionally, the diaphragm isn't going to do any good if milk gets spilled on the end of the tubing, or even on the motor itself where the tubing connects, during the disassembly process. That milk (and any pathogens) could get drawn into the motor and remain there until a subsequent Mom goes to use it.
Since the subsequent user should also be using a Hygenikit the chances may seem slim that the milk and any pathogens would back up into "Hygenikit" but they could back up into the tubing which the subsequent user would be handling just before pumping. So while the risk seems remote, there is a possiblity that a subsequent user, and her baby, could become infected with something potentially serious such as HIV, Hepatitis, etc.
I would use the same standard for used pumps and donor milk that I would an unscreened blood donation. If it didn't come from a close family member with a clean medical history I wouldn't use it.
I realize that this is a gift and you don't want it to go to waste. If it's any consolation, the Hygenikit itself can be sterizilized. So if you wind up getting a PY you could keep the used Hygenikit for spare parts. However, I would get rid of the small silicone parts (valve/membrane and diaphragm) and the tubing. The small parts are susceptible to micro tears, it's probably more cost effective to simply replace those. I'm not sure the tubing is supposed to be sterilized. I think they melt or get discolored so you can't easily see if there is any moisture in them.
The bottles and the white plastic cap can be boiled for 20 minutes or so.