Insulin pumps are small devices, about the size of a pager. One or more microprocessors control the rate and timing of insulin delivery.

Quick acting insulin, (Humalog, Regular or Velosulin) is delivered continuously through a needle inserted in the body, connected by a very thin tube to the pump at the other end. The tube and needle is referred to as an "infusion set".

Long acting insulin, such as NPH or UltraLente, is not used in insulin pumps.

The pump is often worn on the user's belt, slipped inside a pocket, attached to the inside of a dress or undergarment, or worn on an elastic band attached to the user's arm or thigh. Some pumpers make an effort to keep their pump out of sight, others make no effort to conceal it. Many pumpers say people frequently think the pump is a pager.

The pump is programmed to deliver a constant background rate of insulin (basal rate), with changes in rates at various times during the day, to closely match the individual's needs. Typically, the basal rate does not need to be changed often, once the person's blood glucose patterns are figured out. There may be some variation due to changing sleep / wake schedules (shift work, for example) or monthly hormonal changes. These changes can be accommodated quite easily with the pump.

A dose of insulin, called a "bolus" is programmed to meet the requirements of food intake. This amount of insulin is usually calculated based on the amount of carbohydrates contained in the meal or snack. A bolus can also be programmed to correct high blood glucose readings. The amount of the bolus in these situations is based on how much a given amount of insulin will lower the pumper's blood glucose level.

Two of the top manufacturers of insulin pumps are Medtronic - Minimed and Disetronic

View a short history of insulin pumps by clicking here

Read my journal about getting put on an insulin pump.