Apparatus and method for conveying a liquid for medical purposes

Means for supplying from a liquid for medical purposes to a surgical site, comprising - a driven pump (2), - input means (15) for a desired value of at least one characterizing the liquid flow parameter, - measuring means (17, 17 ') for the actual value of the parameter and - a control device (16) for determining the deviation and outputting a manipulated variable for the pump (2), wherein the control device (16) is equipped with a safety circuit, characterized in that the measuring device (17, 17 ') and the control means (16) are formed such that the safety circuit of the controller (16) switches off the pump (2) when a lower limit value I