In general all embodiments relate to implantable medical devices including at least one injectable device and at least one anchor for fixation of the injectable device to body tissue. The anchor of the implantable medical device fulfills the requirement for secure anchoring of the injectable device to body tissue. The medical device includes at least one contrast agent reservoir with an outlet, wherein the reservoir is filled with a contrast agent, which may be released through the outlet into body tissue or cavities. The contrast agent is able to be visible with known imaging methods comprising X-ray or Mill imaging or other well-known techniques to determine if a secure anchoring of the medical has been achieved.
