The medical stimulator market is also stratified by device type, a taxonomy that influences engineering cycles, regulatory pathways, and cost structures. Implantable stimulators—including cardiac pacemakers, spinal cord stimulators, and deep brain stimulators—represent the highest revenue tier, driven by long‑term implantation cycles and premium pricing. External (wearable) stimulators such as transcutaneous electrical nerve stimulation (TENS) units and surface neuromodulation patches occupy a mid‑range segment, accounting for approximately 40 % of unit sales due to lower procedural costs and broader outpatient adoption. Hybrid systems, which combine an implanted pulse generator with an external controller, capture a niche but growing share (around 10 %) as they enable programmable therapy without repeated surgeries. Research‑grade stimulators, typically modular platforms used in pre‑clinical and clinical investigations, constitute the remaining 5 % of the market, reflecting limited commercial volume but high unit price. By isolating these types, analysts can map technology diffusion, forecast replacement cycles, and assess the impact of emerging power‑management innovations on overall market trajectory.