A medical probe, comprising: a shaft configured for insertion through a cut in a chest of a patient, wherein the shaft comprises a working vacuum channel running therethrough to the distal edge of the distal end of the shaft, wherein the shaft defines a longitudinal shaft axis, and wherein the working vacuum channel extends along the longitudinal shaft axis; a camera, which is fitted at a distal end of the shaft and is configured to provide images of a pericardium site in the chest; an inflatable balloon, which is configured to stabilize the distal end of the shaft, wherein the inflatable balloon is located proximally to the camera so as not to obstruct the images of the target tissue site, and wherein the distal end of the shaft is configured to be advanced over a guidewire to bring the inflatable balloon, when collapsed, under a fatty epicardial sub-layer of a pericardium site; and an ablation catheter configured to be inserted via the working vacuum channel for treating the myocardium location, wherein the camera is configured to provide images of treatment by the ablation catheter, characterized in that the medical probe comprises: a hollow cutting tool for insertion over the guidewire through the working vacuum channel of the shaft until the hollow cutting tool protrudes beyond the distal edge of the distal end of the shaft, wherein the hollow cutting tool has a form of a needle, a blade, or a cutting laser, and is configured to pierce the pericardium site, including the fatty epicardial sub-layer, under guidance of images taken by the camera, wherein the working vacuum channel is configured to lift the pericardium at the pericardium site to facilitate its incision by the hollow cutting tool with minimum risk to the myocardium location underneath, and wherein the inflatable balloon entirely encircles a cross section, taken in a direction perpendicular to the longitudinal shaft axis, of the medical probe. a shaft configured for insertion through a cut in a chest of a patient, wherein the shaft comprises a working vacuum channel running therethrough to the distal edge of the distal end of the shaft, wherein the shaft defines a longitudinal shaft axis, and wherein the working vacuum channel extends along the longitudinal shaft axis; a camera, which is fitted at a distal end of the shaft and is configured to provide images of a pericardium site in the chest; an inflatable balloon, which is configured to stabilize the distal end of the shaft, wherein the inflatable balloon is located proximally to the camera so as not to obstruct the images of the target tissue site, and wherein the distal end of the shaft is configured to be advanced over a guidewire to bring the inflatable balloon, when collapsed, under a fatty epicardial sub-layer of a pericardium site; and an ablation catheter configured to be inserted via the working vacuum channel for treating the myocardium location, wherein the camera is configured to provide images of treatment by the ablation catheter, characterized in that the medical probe comprises: a hollow cutting tool for insertion over the guidewire through the working vacuum channel of the shaft until the hollow cutting tool protrudes beyond the distal edge of the distal end of the shaft, wherein the hollow cutting tool has a form of a needle, a blade, or a cutting laser, and is configured to pierce the pericardium site, including the fatty epicardial sub-layer, under guidance of images taken by the camera, wherein the working vacuum channel is configured to lift the pericardium at the pericardium site to facilitate its incision by the hollow cutting tool with minimum risk to the myocardium location underneath, and wherein the inflatable balloon entirely encircles a cross section, taken in a direction perpendicular to the longitudinal shaft axis, of the medical probe.