Method and apparatus for versatile minimally invasive neuromodulators

A medical apparatus for a patient, comprising:

• an external system configured to transmit one or more transmission signals, each transmission signal comprising at least power or data;
• and
• an implantable system configured to receive the one or more transmission signals from the external system;
• wherein the external system comprises a first external device comprising:
• at least one external antenna configured to transmit a first transmission signal to the implantable system, the first transmission signal comprising at least power or data,
• wherein the first external device transmits a periodic security signal to a first implantable device;
• and
• wherein the implantable system comprises the first implantable device comprising:
• at least one implantable antenna configured to receive the first transmission signal from the first external device;
• at least one implantable transmission module configured to transmit data to the external system;
• and
• a variable load connected to the at least one implantable antenna, wherein data is transmitted by varying the load,
• wherein the medical apparatus is configured to at least one of neuromodulate tissue or record patient information,
• wherein the medical apparatus is configured to provide asynchronous transfer of data between the external system and the implantable system,
• wherein the periodic security signal is used by the first implantable device in a calibration routine to ensure that at least one of a timing of the neuromodulation is maintained to a desired specification or the first transmission signal is operating within an expected quality range, and
• wherein the medical apparatus is configured to enter a warning state when one or more of the following conditions occur:
• the first implantable device does not reply to the periodic security signal;
• the first implantable device does not receive the periodic security signal;
• and combinations thereof.