Heart help device, system, and method

An implantable device for improving the pump function of the heart of a human patient by applying an external force on the heart muscle, said device comprising at least one pump device comprising:

• first part having a first surface adapted to be placed outside the heart, and
• a second part having a second surface adapted to be paced outside the heart, wherein
• said first part is adapted to be displaceable in relation to the second part,
• said first and second surfaces are adapted to abut each other, at least partially,
• said first surface is substantially parallel to said second surface,
• said first and/or second part comprises coils and said first and/or second part comprises magnets,
• said displacement of said first part is created through successive energizing of said coils, and wherein
• said first part is adapted to exert, directly or indirectly, force on an external part of said heart muscle, when implanted.