Health care industries are progressing towards improving the health condition of the society, by developing new medical devices with innovative technologies. The advancement in medical technology has brought to reality developing sensor-based medical devices, which are implantable as well as wearable. The present challenge is designing in terms of low noise, low power, low area design techniques, considering patient safety and for a long term process these devices are getting more prevalent in the society. Addressing the problem of battery drain in Implantable Medical Devices (IMD) to the replacement of IMDs and additional surgeries would be the solution due to that. This survey paper presents a glimpse of a deep survey done on various types of power approaches that are carried out on Implantable Medical Devices focusing on extending their durability and attempts done to design various types of amplifiers and converters for sensors used in different medical devices.