You can reuse infusion sets. Not just leave them in the same place, but re-insert them into a different place. This can be used as a cost saving measure.
These instructions are for the manually inserted teflon infusion sets:
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After you insert the cannula, and remove the insertion needle (stylus), keep the stylus. Just put it in a safe clean place.
cannula and stylus -
After 3 days or whenever you remove the cannula from your body, don’t throw it out. Just gently clean the cannula with alcohol.
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Reinsert the stylus you saved in BACK into the cannula. Do it carefully so you don’t pierce the side of the cannula with the stylus.
stylus reinserted into cannula, ready for re-use -
Now you can reinsert the whole thing into a different location on your body.
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Because the adhesive is already used, you will need to use a different adhesive, such as Tegaderm or DexTape to secure the infusion set.
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Re-using it twice - for another 3 days - is pretty easy. More than that and it becomes a bit fragile.
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As always, check your BG frequently after a site change.