Continuous Sub-cutaneous Insulin Infusion The Continuous Subcutaneous Insulin Infusion (CSII) Pump (insulin pump for short) is a pager-sized device which can be connected to the body through an infusion set so as to deliver insulin continuously. It consists of a disposable reservoir for insulin, a disposable infusion set, including a cannula for subcutaneous insertion and a tubing system which connects the insulin reservoir to the cannula. Insulin pump therapy by itself is not a new therapy for diabetes mellitus. It is an alternative delivery mechanism for administration of insulin and is found to be superior to ordinary syringes and insulin pens. Insulin pumps were popularly used in T1DM but nowadays insulin pumps are commonly used in T2DM patients as well.