Cartridges (interchange)

The cartridge images are illustrations only and not meant to represent any particular brand. I am displaying them so that I can provide measurements.

Do not rely on precision of these charts. They are approximate – and the differences trivial.

I have been able to insert a Humalog cartridge into a ClikSTAR pen. The Lantus cartridge also fits into a HumaPen. Other than trivial spatial differences that should not make any difference, the only other difference I can see is that the Humalog cartridge plunger has a space to the edge of the cartridge (it is further recessed into the cartridge body) while the Lantus plunger is nearly flush to the edge of the cartridge body.

I can confirm that my Humalog works in a ClikSTAR pen. I can also confirm that my Lantus and Apidra both work in a HumaPen.

I had originally started using Lantus and Humalog. The Lantus was in cartridge format and inserted in a ClikSTAR pen. The Humalog was in cartridge format and inserted in a HumaPen Savvio. Both were carried in the ClikSTAR case.

I ran into several problems with the Apidra in the ClikSTAR pen. In approximately every second use, the priming did not eject any insulin. I repeated the priming up to four times, ending up with a shooting stream of insulin. I then injected my dosage amount (typically 4 units). On those occasions where the priming did not have initial immediate effect, my Bloog Glucose levels were usually high. My sense is that the dose did not come out of the needle into my adbomen fully (if at all).

Starting with the second cartride, I decided to go beyond just testing the fit of the Apidra into the HumaPen Savvio. I am actually using it that way now. I also decided to make the switch with the Lantus as well and use that in a HumaPen Savvio.

My Apidra is in a dark grey HumaPen Savvio and my Lantus is in a red HumaPen Savvio. Both are in individual cases that came with the HumaPen Savvio. In the picture at the right, the pen in the case on the left has the Apidra cartridge inserted (as I have used it). The pen in the case on the right as the Lantus cartridge inserted (as I have used it). You will note that the cases are both the same colour. If you look carefully, you will see that there is a canvas tab on the zipper pull. I have coloured the one on the left (Apidra) with a black Sharpie marker so that it looks grey to indicate the dark grey HumaPen with Apidra cartridge is in that case. The case on the right has the original bright red canvas on the zipper pull, indicating it has the red HumaPen with Lantus cartridge in that case.

You can see both cases in my day-to-dary carry bag. This carry all bag is a Case Logic model PDVS-4 designed to accommodate a 7 inch DVD player. This case is perfect and holds all the supplies I need to one day to one week. You can read more about my choices for day-to-day carry bags at this page. I have the canvas zipper tabs oriented in opposite directions to also help differentiate the insulin type in the case.

Humalog Cartridge
Atotal height6.4 cm2.53 in.
Bheight6.3 cm2.5 in.
Cheight5.5 cm2.38 in.
Dtotal width1.15 cm0.46 in.
Ewidth (inner)0.89 cm0.36 in.
Fwidth (top)0.8 cm0.315 in.
Lantus Cartridge
Atotal height6.38 cm2.52 in.
Bheight6.3 cm2.5 in.
Cheight5.6 cm2.4 in.
Dtotal width1.15 cm0.46 in.
Ewidth (inner)0.89 cm0.36 in.
Fwidth (top)0.8 cm0.315 in.

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