For similar / further reading on historical pacemakers, check out https://www.implantable-device.com/category/implantable-components/power-sources/ https://www.

For similar / further reading on historical pacemakers, check out https://www.implantable-device.com/category/implantable-components/power-sources/ https://www.implantable-device.com/category/implantable-comp... where David Prutchi has amassed what I think is a comprehensive history of pacemakers / neurostimulators ranging from these early atomic designs up through current day devices / companies.