insulin pump insulin pump an insulin pump is a medical device used for the administration of insulin in the treatment of diabetes mellitus, also known as continuous subcutaneous insulin therapy. the device configuration may vary depending on design. a traditional pump includes: the pump (including controls, processing module, and batteries) a disposable reservoir for insulin (inside the pump) a disposable infusion set, including a cannula for subcutaneous insertion (under the skin) and a tubing system to connect the insulin reservoir to the cannula.