> 315 million times. That's an order of magnitude higher than we typically test fatigue resistance
Nah, it's not that bad. Decent mechanical keyboard switch is specified for 100 million clicks [1, or google for "switch million actuations"]. Surely good engineering can eek out another order of magnitude. Not to mention - pacemaker leads ("wires"), the only part that bends, have way less stress on them (= larger bend radius) compared to a keyboard switch. Oh, and technology of multi-strand wire for redundancy is a very well established and understood one.
Nah, it's not that bad. Decent mechanical keyboard switch is specified for 100 million clicks [1, or google for "switch million actuations"]. Surely good engineering can eek out another order of magnitude. Not to mention - pacemaker leads ("wires"), the only part that bends, have way less stress on them (= larger bend radius) compared to a keyboard switch. Oh, and technology of multi-strand wire for redundancy is a very well established and understood one.
[1] https://cdn-shop.adafruit.com/product-files/4974/EN_CHERRY_M...