#$%^&*AU2019359616A120200625.pdf#####ABSTRACT The present invention relates to a medical fluid injector. In particular, by including a bolus counter that 5 provides the correct number of bolus injections, it is possible to prevent the problem of excessive administration of a medical fluid due to frequent bolus injections through the management of the number of bolus injections, and increase effectiveness of treatment through the 10 establishment of a treatment strategy based on the number of bolus injections provided.