September 24th, 2010

physics question

i don't understand why cups leak after they are full. it doesn't make sense that the blood would break the seal, especially when we are able to do things like laying down in bed without getting leaks. it seems to me that if the blood itself breaks the seal then it would break whenever blood sloshes up to the rim, like when you lay down, or do yoga or whatever. OR just when the blood runs out of your cervix and down the wall of your vagina into the cup!

the only reason i can think of that the seal would be broken when the cup is full is if the entire area between the cup and the cervix filled with blood, and then you bled more. in this case i could see the pressure breaking the seal, but this seems like a very rare scenario. even in this case it doesn't make a whole lot of sense, it seems like the cup would just get pushed down. this is of course if your cup actually sits as low as in the diagrams. if your cervix is really low i could see this happening easily, the filling of the whole area, but i still don't understand why it would leak unless it got pushed down so far that your pubic bone misshaped the rim.

does anyone understand this better than i do? i am just curious because i keep thinking about it and realizing that i just don't get it. hope my question makes sense! i guess i am also paranoid about leaks, and i don't understand why they ever happen if your cup opens up properly.
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Thought you ladies would appreciate this little tale...
I am in pediatrics, and had a patient the other day who complained that her flow was too light to use a tampon comfortably. She wondered if I could help. Little did she know... I think she and her mother almost fell off of their chairs when I mentioned menstrual cups. They gave me a look like I'd sprouted a second head, but I think it was a very reasonable suggestion! I told them to take a look around online and think about it. (We live in a small town and the local natural foods store does carry cloth pads, but I don't think they have cups.)

The best response to cups... no response!

Went to my doctor today with a case of thrush (aka a yeast infection, blech). I asked if I had to be careful with my cup, expecting at least a "what are those?" Instead, not even missing a beat, she said, "You'll want to boil it, love."

My doctor ftw! ;)
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