A device and method for implanting a catheter between the left atrium and/or left ventricle of the heart from a prepectoral region through a less invasive and lower-risk approach is provided that allows the implantation of the catheter in the left cardiac chambers through a femoral approach atrial transseptal puncture, and the removal of the catheter proximal end by a retrograde venous route. The device includes a transseptal sheath for slidably carrying the catheter, an elongate pulling element attached to a proximal end of the catheter, a runner slidable within the transseptal sheath and operable for biasing against the proximal end of the cardiac catheter, and a loop catheter having a loop formed at one end thereof, wherein the loop is dimensioned for receiving the transseptal sheath and for receiving the elongate pulling element therein when the loop and the elongate pulling element are separated from the transseptal sheath.
