You are exactly right. What "closed" systems due is limit the volume of tissue that can be pulled into the flange. Whether that is a good thing or not, is unclear. The FDA info sheet available on the web, seems to indicate the open systems do a better job than closed. Not sure of their sources of information. Larger pistons (such as what was in the old Ameda and Medela Classic pumps) could draw more volume but also had a positive pressure aspect of the cycle not present in most modern pumps of today - which would result in a release of vacuum effect on the areolar tissue. That may be why classics were so effective in treating engorgement early on, not such a big deal later on in lactation. Just thinking here ----
-----Original Message-----
From: Lactation Information and Discussion [mailto:[log in to unmask]] On Behalf Of Smith, Mary Kay
Sent: Friday, February 22, 2013 3:35 PM
Subject: medela closed system
I work with Symphony pumps every day and don't see HOW milk could get into that motor even with a torn membrane. However, and I may get flamed for this, the closed system is to protect the pump, not the milk. ALL pump kits are vented to outside air (in the collection bottle) otherwise the suction would build up in the bottle and increase to the point of severe discomfort. Don't believe everything you read...or are told.
Mary Kay Smith, RN, IBCLC, FILCA
Lactation Consultant
Henry Ford Hospital
Detroit MI
313-916-8363 office
146-4333 in house pager
313-990-4333 long range pager
"Babies are born to breastfeed"
[cid:image001.png@01CE111A.8ECCA040]
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