An injection apparatus including a distally arranged cooling element, wherein the cooling element is detachably coupled to the injection apparatus or to a needle protecting device coupled to the injection apparatus, and a corresponding or complementary cooling container. A unity power factor control circuit maintains unity power factor incorporating the steps of producing a sample and hold voltage related to the input voltage and an output voltage where the sample and hold voltage maintains constant values between pulses of a clock signal. The second opening is adjacent or at least proximate the first opening.