Sapporo IABP system was made. It is composed of electronic controller and pump unit (Cordimat IV) Triggering is with the R-Wave, filling interval depends upon deflation interval. Skip circuits and automatic deflation time circuits are added. The device was used in 9 patients with acute myoca rdial infarction and cardiogenic shock, 6 patients of them were improved generally and 3 were temporarily weaned from the IABP.