An insulin pump is a small device. It's about the size of a cell phone. Insulin is sent from the pump to the body through a thin plastic tube. The tube is attached to a soft, flexible tube called a cannula. The cannula is put under the skin.
The pump can give a steady dose of insulin. This is called a basal dose. It acts like the body's natural release of insulin. The pump can also give a single dose. This can be given before meals. Or it can be done to correct high blood sugar. This is called a bolus dose.
The pump is worn all the time, day and night. It is easily hidden under loose clothing. Or it can be clipped to a waistband or belt. But it can be disconnected for a short time for taking a bath or shower.