[Previous Months][Date Index][Thread Index][Join - Register][Login]
[Message Prev][Message Next][Thread Prev][Thread Next]

[IP] Re: Avoiding Bubbles

Curtis, When the ambient pressure is lowered, even if the bubbles did grow,
no insulin would be pushed into the body.  The bubbles only grow because
there might be some "pulling" on the plunger.  However, the design of the
MM pump actually would prevent any pulling back, since the plunger is set
with tight contact to the driver.  So flying will have almost no effect on
bubbles or insulin delivery.  Also going from cold to room temperature will
cause only minimal air to come out of solution, usually not enough to worry
about.  I agree, though that bubbles are often a problem, and that cold
insulin tends to make it more difficult for one to clear out the syringe of
air.  So we agree on that, but the major cause of the problem is not the
dissolved air.

<<<<<<<Actually, rate of change will only effect the rate of bubble
formation, bubbles
will form.  If the system is saturated the lower pressure will allow bubble
formation.  Assuming a rigid sealed container this expansion will force insulin
out and into the infusion site.  Any bubbles that have formed or were left
in by
poor technique before the change in altitude will also increase in size forcing
even more insulin into the body.  6000 ft has an air pressure of about 11 psi
and airlines are generally pressurized to only 8000ft so there is substantial
volume changes in bubbles when flying.  Don't fly with bubbles.>
Curtis >>>>>>>>>>

for HELP or to subscribe/unsubscribe, contact: HELP@insulin-pumpers.org
send a DONATION http://www.Insulin-Pumpers.org/donate.shtml