Titanium alloy medical basis
The main advantages of using titanium and titanium alloys as human implants are:
(1) Density (20℃)=4.5g/cm³, light weight. Implanted into the human body: Reduce the load on the human body. As a medical device: Reduce the operating load on medical personnel.
(2) The elastic modulus is low, pure titanium is 108 500 MPa, and it is implanted in the human body: it is closer to the natural bone of the human body, which is conducive to bone grafting and reduces the stress shielding effect of the bone on the implant.
(3) Non-magnetic, not affected by electromagnetic fields and thunderstorms, which is beneficial to human body safety after use.
(4) Non-toxic, it has no toxic or side effects on the human body as an implant.
(5) Corrosion resistance (biologically inert metal material). It has excellent corrosion resistance in the immersion environment of human blood, ensuring good compatibility with human blood and cell tissues. As an implant, it does not produce human pollution and does not cause Allergic reactions will occur, which is a basic condition for the application of titanium and titanium alloys.
(6) High strength and good toughness. Bone and joint damage due to trauma, tumors and other factors. In order to establish a stable bone scaffold, arc plates, screws, artificial bones and joints, etc. must be used. These implants must be left in place for a long time. In the human body, it will be subject to bending, twisting, squeezing, muscle contraction and other effects of the human body, requiring implants to have high strength and toughness.
The medical titanium alloys currently produced are mainly α+β type titanium alloys. From the perspective of preparation technology, the production of TC4 (TC4ELI) currently occupies the main market share. β-type titanium alloy has certain advantages in biocompatibility and mechanical compatibility, so it has become a research hotspot for new medical titanium alloys and is the most potential technology in the field of medical implants.
