souce: http://www.diabetesresearchnetworking.org/index.php?tab=§io... Insulin pump therapy is also known as continuous subcutaneous insulin infusion therapy or CSII. It was invented in the 1970s by people using pumps to infuse drugs that had to be given very slowly. Again the principle is simple. A fast acting insulin is placed in a chamber like a syringe which is fitted into the pump and connected through a long thin tube to a plastic needle inserted into the fat layer of the skin. The pump simply presses the plunger on the syringe very slowly. This delivers a very small, constant trickle of insulin at a pre-determined rate to provide constant background insulin. The wearer can operate the pump to deliver a short sharp burst of insulin whenever required – for example, at mealtimes. Over the years, the pumps have become smaller and lighter and easier to wear. New features have been developed – the latest pumps include computerised displays of recently given insulins, calculators that can help judge meal insulin doses, and displays for glucose meters.