The Race to Put Brain Implants in People Is Heating Up

an interesting question would be if one could augment the myocardial membrane surrounding the heart in a piezoelectric harness that is perfectly printed to the size and shape of the heart in a slightly smaller position when its between pumps such that the beating of the heart deforms the membrane and creates the power required for the implants.

A bonus test would be to see if such a heart-sheath could be used as a (de)fibrillator where an external electrical input could contract and release the sheath.

The risk is to prevent unwanted external electrical stimulation, even by EM/RF waves such that the heart couldn't be remotely attacked, or be subject to external interference (prolly couldn't ever get an MRI again.

Maybe you'd have to wear faraday vests/garments if you go full cyberpunk.

Cyberpunk Couture is going to be lit! (I already want Faraday garments (already have a wallet)

Yeah - there are a lot of studies on it:

Piezoelectric materials can generate electricity under mechanical stress without requiring an external power supply. This property makes them a promising candidate for powering implantable medical devices 123. Researchers have developed bio-compatible generators that create electrical pulses when compressed by body motions. These generators are made up of self-assembling “piezoelectric wafers” which can be made rapidly and inexpensively to enable broad use of muscle-powered electro-mechanical therapies 4. Another study describes a piezoelectric energy generator that is driven by stimulated muscle and is break implantable into the human body. The generator concept includes connecting a piezoelectric stack generator in series with a muscle tendon unit 2.