A method of implanting a cardiac device featuring the insertion of an inner seal member through an opening in a pericardium about a living human heart. The inner seal member has a first sealing lip disposed inside the pericardium and surrounding an aperture through the inner seal member. An outer seal member is aligned with the inner seal member. The outer seal member has a second sealing lip disposed outside the pericardium, surrounding an aperture through the outer seal member. The inner seal member is secured to the outer seal member. The firsts sealing lip is engaged against an inner surface of the pericardium. The second sealing lip is engaged against an outer surface of the pericardium. A cardiac device is inserted into the pericardium through the apertures of the inner and outer seal members.
