Tiny, Injectable Pacemaker Runs on Light and then Dissolves

A miniature, dissolvable temporary pacemaker, injectable with a needle, has been created to eliminate surgical implantation and removal. Smaller than a rice grain, it uses a galvanic cell for power and a light-activated switch for control. Paired with a skin patch to monitor heart rate, it functions for days to weeks before dissolving. This advancement could minimize risks associated with traditional temporary pacemakers, particularly for newborns and patients with small hearts.