what is considered medical devices?

Medical devices encompass a wide range of instruments, apparatuses, machines, implants, in vitro reagents, and software used in healthcare for diagnosis, treatment, monitoring, or prevention of diseases or medical conditions. Can you provide examples of medical devices, such as X-ray machines, surgical instruments, blood glucose meters, and prosthetic limbs? How do regulatory agencies classify medical devices based on their intended use and level of risk, from low-risk items like tongue depressors to high-risk implants such as artificial heart valves? Additionally, how does the definition of medical devices vary across different regulatory frameworks and jurisdictions around the world?