Medical Semiconductor Implantable is semiconductor devices implanted within body for diagnostic monitoring, therapeutic delivery, wireless communication — enables personalized medicine. Implantable Applications pacemakers (heart rhythm), defibrillators (cardiac arrhythmia), insulin pumps (diabetes), neural stimulators (pain, Parkinsons). Biocompatibility semiconductors encapsulated in biocompatible materials (silicone, parylene). Coating prevents corrosion, immune reaction. Wireless Power coils couple magnetic fields; rectifier converts to DC power. Eliminates battery: monolithic power source. Wireless Communication data transmitted to external receiver. Telemetry. Bidirectional (parameters updated remotely). Sensors temperature, pressure, chemical sensors integrated. Real-time physiological monitoring. Implant Lifetime depending on application: years to decades. Battery limited some devices. Biocompatibility Testing ISO 10993 standards test cytotoxicity, sensitization, irritation. Size Minimization ultra-compact designs: cardiac pacemakers ~5cm x 4cm x 0.8cm. Power Consumption milliwatt to microwatt operation. Wireless power rectifier ~70% efficiency. Data Bandwidth low data rate (kbps typical) for monitoring. Adequate for most applications. Frequency medical implant frequency bands: 402-405 MHz (MICS = Medical Implant Communication Service). Range wireless communication 10-100 cm typical. Hermetic Packaging encapsulation hermetic to prevent moisture ingress (life-limiting failure). Reliability must operate without service for implant lifespan. Failure often requires surgery. Biointegration silicon, for example, chemically inert; surfaces engineered for cellular interaction. Stimulation pacemaker electrode delivers current pulses. Electrochemistry at interface important. Sensor Accuracy sensor precision must be high (millidegree temperature, kilopascal pressure). Signal Processing embedded firmware performs artifact detection, filtering, decision-making. Power Management wireless power varying; power management adapts. Regulatory FDA approval required for medical devices. Years of testing, documentation. Miniaturization advancing technology enables smaller implants, lower power, more functions. Fully-Implantable some devices powered externally, eliminating battery/wires. Medical implantable semiconductors enable new healthcare diagnostic and therapeutic modalities.