My son used insuflon for a while when he was on MDI (he was about 6 at the time). It's basically a subcutaneous catheter (like a pump cannula) which you insert using a needle that is then withdrawn, leaving behind a plastic cannula under the skin, secured by a dressing on the top with a little bung. All fast-acting insulin injections are then done into this bung, instead of piercing the skin. The catheter should be changed every 5-6 days. Long-acting insulin must be injected separately, because there is a little insulin in the "dead space" of the catheter which mustn't be mixed.
The advantages of using insuflon are:
* fewer injections piercing the skin (just one long-acting per day, and one catheter needle every 5-6 days), so this is good for the needle-phobic, and also good for reducing problems with scarring and bruising at injection sites
* easy to give extra injections for between-meal snacks, corrections etc.
* easier to deal with meals like pasta which take a long time to digest, by giving two injections a couple of hours apart (but with no extra pain!)
Insuflon was a great help to us in being able to give MULTIPLE INJECTIONS instead of "4-a-day", however it falls far short of the flexibility of a pump.