An insulin reservoir is a little reservoir that contains 1.8mL or 3.0mL of insulin that is put into insulin pumps. The vile is about 2 inches tall.
Insulin is stored in here and is then put into the insulin pump.
The tranfer guard is used to deposit the insulin from the vial into the minimed connection.
The insulin vial is a vial with insulin inside it.
The pumping mechanism pumps the insulin from the reservoir through a cannula that is connected to your arm or stomach into your blood stream.
The pumping mechanism and insulin reservoir is inside the device and the device is used to control how much insulin you want to get pumped into your bloodstream.