Passive, remote monitoring…requires neither the patient nor the medical provider to do anything. The implanted device sends signals into the cloud that will be used by providers to intervene if necessary, and be compiled in databases that will be used for research. An example would be an artificial knee that measures its range of motion when the patient walks, sending a stream of motion-capture data for analysis. If the range of motion is too narrow or inconsistent, the patient can be called in to have the implant inspected.
Source: John Graham, who (unusually) goes on to give advice on how the industry should be structured.