Insulin pumps regulate insulin delivery through a small infusion set with a cannula under the skin.

“so there's an insulin pump that is on your body it's about the size of a good old-fashioned pager and they used to carry around in your hand and there's an insulin cartridge inside that pump contains software that regulates the delivery of insulin with a with that through that insulin cartridge to a small infusion set but it is usually placed on your abdomen a little teflon cannula goes under your skin”