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 a first position of the heart muscle following the heart's contractions, said implantable device comprising a first pump device adapted to assist the pump function of the heart, said pump device comprising:

• a first reservoir having a first volume and adapted to varying said first volume,
• a second reservoir having a second volume and adapted to varying said second volume,
• a fluid connection adapted to fluidly connect said first reservoir with said second reservoir, such that fluid can flow between said first reservoir and said second reservoir, wherein
• said first reservoir, said second reservoir and said fluid connection form a fully implantable pump device adapted to maintain a fluid in a closed system, when in operation, and wherein
• said fully implantable pump device is adapted to transfer force by transferring fluid from said first reservoir to said second reservoir to directly or indirectly apply an external force on the first position of the heart muscle, following the heart's contractions, for improving the pump function of the heart, when said device is implanted
• a subcutaneous injection port for calibrating a fluid level of said fully implantable pump device from the outside of the body of the patient.