**Abstract**

Wireless power transmission (WPT) can provide an alternative for wireless power in implantable medical devices (IMDs). The WPT in implantable medical devices will involve many emerging biomedical topics, such as implantable pacemakers, optogenetic devices, and bio-impedance sensors. To this end, this chapter comprehensively reviews the recent WPT studies for those mentioned above emerging biomedical applications. The specific key components are carried out for those applications. Besides, the operation principle and system design are presented. In conclusion, this chapter's significance can help evolve reliable implantable device development in the future.

**Keywords:** bio-impedance sensor, electrical field coupling, implantable medical devices, magnetic field coupling, optogenetic device, pacemaker, resonance circuit
