guide catheter the intravascular pump assembly of the present invention is particularly suited for trans valvular use such as for left and or right ventricular assist procedures by way of example only such ventricular assist procedures may be employed in cardiac operations including but not limited to coronary bypass graft cabg cardio pulmonary bypass cpb open chest and closed chest minimally invasive surgery bridge to transplant and or failure to wean from bypass situations it is to be readily understood however that the intravascular blood pump assembly and methods of the present invention are not to be limited to such applications moreover while illustrated and described largely with reference to left heart assist applications it is to be readily understood that the principles of the present invention apply equally with regard to right heart assist application which are contemplated as within the scope of the present invention these and other variations and additional features will be described throughout referring to fig1 shown is a guidable intra vascular blood pump system 10 according to a first broad aspect of the present invention shown by way of example only in a left heart assist configuration within a human heart the system 10 includes an intravascular blood pump 12 a cannula 14 and an u201c over the wire u201d type guide mechanism 16 a drive cable assembly 18 and a motor assembly 20 are provided to drive the intravascular.