In the medical field, implant-grade memory alloys are mainly used to manufacture drug delivery devices and implants. Drug delivery devices, such as stents and catheters, can be manufactured into small drug delivery networks that can safely discharge drugs in small blood vessels and nerves due to the superelasticity and shape memory properties of memory alloys. In addition, memory alloys are also used to manufacture various implants, such as artificial arms, cochlear implants, heart stents, etc. Since memory alloys have good biocompatibility and can be absorbed by human tissues, bones and muscles, they are very suitable for use in the medical field.