An intracardiac pump device comprising: a path for a guidewire extending through the intracardiac pump device from a first opening to a second opening; a distal pump portion; a proximal drive portion coaxial to the pump portion, the drive portion including a motor; the distal pump portion connected to a distal end of the drive portion, a proximal end of the drive portion connected with a catheter holding electric lines configured to operate and control the intracardiac pump device; one or more discharge ports positioned between the drive portion and the pump portion, wherein a discharge port of the one or more discharge ports defines the second opening; an inflow cannula, connected to a distal end of the pump portion, the cannula having proximal and distal ends, wherein the distal end is provided with a suction head having inflow openings; a flexible tubular pigtail extension connected to the distal end of the inflow cannula, wherein the pigtail extension comprises the first opening, the path for the guidewire runs from the first opening through the tubular pigtail extension, from the pigtail extension into the inflow cannula, through the inflow cannula into the pump portion, and to the second opening, a loading guide lumen configured to receive the guidewire therethrough, such that when the guidewire passes through the loading guide lumen from the first end to the second end, the guidewire is positioned along the path, the loading guide lumen having a first end and a second end; wherein the first end of the loading guide lumen is located outside of the first opening, the loading guide lumen extends into the first opening along the path for the guidewire, through the cannula, and through the second opening such that the second end of the loading guide lumen is located outside of the second opening; wherein the loading guide lumen is configured such that, after the guidewire is received by the loading guide lumen along the path for the guidewire, the loading guide lumen may be withdrawn from the intracardiac pump device without disturbing the guidewire from the path. a path for a guidewire extending through the intracardiac pump device from a first opening to a second opening; a distal pump portion; a proximal drive portion coaxial to the pump portion, the drive portion including a motor; the distal pump portion connected to a distal end of the drive portion, a proximal end of the drive portion connected with a catheter holding electric lines configured to operate and control the intracardiac pump device; one or more discharge ports positioned between the drive portion and the pump portion, wherein a discharge port of the one or more discharge ports defines the second opening; an inflow cannula, connected to a distal end of the pump portion, the cannula having proximal and distal ends, wherein the distal end is provided with a suction head having inflow openings; a flexible tubular pigtail extension connected to the distal end of the inflow cannula, wherein the pigtail extension comprises the first opening, the path for the guidewire runs from the first opening through the tubular pigtail extension, from the pigtail extension into the inflow cannula, through the inflow cannula into the pump portion, and to the second opening, a loading guide lumen configured to receive the guidewire therethrough, such that when the guidewire passes through the loading guide lumen from the first end to the second end, the guidewire is positioned along the path, the loading guide lumen having a first end and a second end; wherein the first end of the loading guide lumen is located outside of the first opening, the loading guide lumen extends into the first opening along the path for the guidewire, through the cannula, and through the second opening such that the second end of the loading guide lumen is located outside of the second opening; wherein the loading guide lumen is configured such that, after the guidewire is received by the loading guide lumen along the path for the guidewire, the loading guide lumen may be withdrawn from the intracardiac pump device without disturbing the guidewire from the path.