Inductively rechargeable external energy source, charger, system and method for a transcutaneous inductive charger for an implantable medical device

A medical system, comprising:

• an implantable medical device;
• an external device configured to transcutaneously transfer energy to the implantable medical device, the external device comprising a sensor configured to provide an indication of heat imparted by the external device to a patient;
• and
• a control circuit configured to control the transfer of energy to the implantable medical device, based on the indication of heat imparted by the external device to the patient and a temperature limit, to limit heat to which the patient is exposed,
• and wherein the control circuit is configured to receive a modified temperature limit that has been modified to fit then-current circumstances involving the transfer of energy to the implantable medical device.

A charging system for an implantable medical device, comprising:

• a coil configured to transcutaneously transfer energy to the implantable medical device;
• a sensor configured to provide an indication of heat imparted to a patient by the transfer of energy to the implantable medical device;
• and
• a control circuit configured to control the transfer of energy to the implantable medical device based on a temperature limit and an indication of heat imparted to the patient, and wherein the control circuit is configured to receive a modified temperature limit to control the transfer of energy to the implantable medical device, wherein the modified temperature limit is modified to fit then-current circumstances involving the transfer of energy to the implantable medical device.