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Re: [IP] Plastic versus Glass reservoirs



Nigel,
   I'd be happy to comment on that.  I called that a "best feature" 
purely as a matter of convenience.  I use the D-Tron Plus, which uses 
300ml glass cartridges.  These are the same size as the pre-filled 
Humalog pen cartridges.  I used these pre-filled cartridges for several 
months until I began to get painful, itchy sites.  I then switched to 
NovoLog (a.k.a. NovoRapid), which also comes in pre-filled cartridges 
but  they are not approved by Diestronic for use in the D-Tron Plus.
   So, to fill my 300ml glass cartridges, I use a Disetronic cartridge 
filling kit.  The kit basically consists of a 315ml plastic cartridge, 
and a two piece jig that holds the glass cartridge and the plastic 
cartridge.  So, to fill my glass cartridge, I put the needle on the 
plastic one, suck the insulin out of the bottle,  and then connect the 
jig together and squirt the insulin into the glass one.    As you can 
see, this procedure is kind of redundant since I'm already filling a 
plastic cartridge, which is why I called the plastic one a "best feature".
   Technologically, I think the glass cartridges are better than plastic 
for several reasons: 1) the plunger has three seals instead of two, 2) 
it has a rubber end-cap like an insulin bottle so I can fill a whole 
bunch of them in advance and not have to worry about contamination, 3) 
they are narrower in diameter, which makes them easier to store (for me, 
at least).  In fact, I carry my "emergency back-up insulin" in glass 
cartridge that I only fill with about 100 units.  Its small enough that 
I carry it and a 3/10cc syringe in my glucometer  case.  After a couple 
of months I throw it out and replace it with a fresh one.
   You can see a picture of a glass cartridge at this URL:

http://www.disetronic-usa.com/d-tronplus/images/ampulle.jpg

   I hope this helps.

Bob...
  

Nigel Armstrong wrote:

>Glass versus Plastic reservoirs?
>
>In a posting back Jan. 9 Bob Stoll was commenting on the pending Accu Chek
>Spirit and said:
>"It looks like they combined the best features in the H-Tron (plastic
>cartridge) and the D-Tron (very programmable) into a new case."
>I seek clarification.
>I was very, very attracted to the concept of using pen-injector cartridges
>as the pump insulin reservoir, a feature I thought only Disetronic offered.
>I gather that at one time they also offered a system of filling up their own
>glass cartridges for clients, but that didn't interest me so much as being
>able to use the cartridges produced and packaged by Lilly (or NovoLog).
>I do not use pen injectors now so I don9t know what9s happening with that
>technology.
>I am just interested in a pump that will use a pre-packaged pen injector
>cartridges.
>Are the Humalog and NovoLog pen cartridges interchange?
>Why did Mr. Stoll say that a 3best feature2 of the H-Tron was its plastic
>cartridge?
>I thought that glass was better for insulin preservation than plastic.
>I also thought that pen injector cartridges are glass. Is that still the
>case or not?
>Thanks for help anyone.
>Nigel
>.
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