A cannula device for infusion sets is provided. The integrated circuit may include a plurality of track-and-hold devices and a plurality of slicer devices. The fan device has a second node, a signal transforming circuit, a motor driving circuit, a motor and a fan. The sight has no sharp edges or surfaces and is essentially snag-free. The inlet quantity of CO2 is greater than the outlet quantity of CO2. As a result, erase degradation of the memory cells is reduced.