The thing about this is body heat is not a source of power.
To have a source of power (for a thermocouple to work) you need a temperature differential, so you would need a part of the thermocouple sticking out of your body.
Another thing is no matter how low the current drawn from batteries is they still need changing batteries only have a limited shelf life (with no current drawn.) Lower power means smaller batteries but I dont think thermocouples are a viable source of power for implants, perhaps they can get power from motion.
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The thing about this is body heat is not a source of power. To have a source of power (for a thermocouple to work) you need a temperature differential, so you would need a part of the thermocouple sticking out of your body. Another thing is no matter how low the current drawn from batteries is they still need changing batteries only have a limited shelf life (with no current drawn.) Lower power means smaller batteries but I dont think thermocouples are a viable source of power for implants, perhaps they can get power from motion.