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Re: [IPk] No Delivery alarms

John N

It's not crystallization as such but a similar situation to milk in a glass.
Some of the protein adheres to the surface.  If it dries then the problem is
much worse.  You are right that the siliconisation (lubricant) is also
reduced with usage.

Can I assure all users that the recommended times given for cartridges and
infusion sets are there to ensure safety and good health - the cynics out
there will come to a different conclusion

Best wishes

John H
-----Original Message-----
From: John Neale <email @ redacted>
To: email @ redacted <email @ redacted>
Date: 20 May 1999 14:55
Subject: Re: [IPk] No Delivery alarms

>>It is not necessarily a blockage that can set off an occlusion alarm.  Any
>>time the motor experiences greater than expected resistance can set off
>>alarm.  What can happen is if the cartridge is used more than once you can
>>get uneven deposition/build up of insulin on the sides of the cartridge.
>>This causes increased friction and can set off the alarm.  The plastic
>>Cartridges Disetronic use have plungers which are pretty solid, they
>>therefore do not deform under pressure the way a soft rubber plunger would
>>and thus the increased pressure is detected quickly.
>John -
>Can you actually get insulin crystals forming on the walls of the
>cartridge? I didn't know that. I'd always assumed it was just the lubricant
>wearing thin or not being spread around sufficiently. And is the
>crystalisation rate different on glass/plastic/oiled plastic?
>John N
>Insulin Pumpers website http://www.insulin-pumpers.org/
>for mail subscription assistance, contact: HELP@insulin-pumpers.org

Insulin Pumpers website http://www.insulin-pumpers.org/
for mail subscription assistance, contact: HELP@insulin-pumpers.org