Implantable devices refer to medical devices that are surgically implanted into the body in order to deliver therapeutic treatments, monitor health conditions, or assist in bodily functions. These devices can be used for a wide range of medical purposes, such as controlling chronic pain, regulating cardiac activity, providing drug delivery, monitoring glucose levels, or restoring hearing or vision. Implantable devices can greatly improve the quality of life for patients with chronic conditions and are continuously being developed and improved with advancements in technology. Research in this area focuses on improving the design, functionality, and biocompatibility of implantable devices, as well as developing new applications for these devices in healthcare.