Good questions, Total99.
The Remedē System is an implantable device that stimulates a nerve located in the chest that is responsible for sending signals to the diaphragm to stimulate breathing. It was FDA approved in October 2020.
Here's more information: FDA approves Remedē implantable device to treat central sleep apnea https://aasm.org/fda-approves-remede-implantable-device-treat-central-sleep-apnea/

Central sleep apnea is a disorder in which your breathing repeatedly stops and starts during sleep. Central sleep apnea occurs because your brain doesn't send proper signals to the muscles that control your breathing. This condition is different from obstructive sleep apnea, in which you can't breathe normally because of upper airway obstruction. Central sleep apnea is less common than obstructive sleep apnea. https://www.mayoclinic.org/diseases-conditions/central-sleep-apnea/symptoms-causes/syc-20352109