Tantalum metal -- the "metallophilic" of human body
Metal materials are widely used in clinical medicine due to their high applicability to mechanical properties and fatigue resistance, and are suitable for bearing parts implantation. Many kinds of metal materials such as stainless steel, titanium base and cobalt base alloy have been widely used in clinic, and some therapeutic effects have been achieved.
However, the complex human environment may lead to the corrosion of materials and the release of toxic substances, which greatly reduces the biocompatibility of metal materials. In addition, the difference between the elastic modulus of some metal materials and human bone tissue is too large, which is not conducive to the growth and remodeling of new bone, and easy to lead to secondary fracture. These disadvantages limit the application of metal materials as biomedical materials.
Tantalum, also a kind of metal material, has excellent mechanical properties and anti fatigue properties, so it is widely used in clinical, especially in orthopaedic field, replacing human bone tissue to play a role in bearing weight, and has achieved remarkable clinical effect. Tantalum has more advantages in strength, biocompatibility and stability than traditional metal implants, so the development of tantalum in the field of medicine has a broader prospect.
Good corrosion resistance
At room temperature, tantalum will not react with hydrochloric acid, concentrated nitric acid or even aqua regia, and ordinary inorganic salts will not corrode it.
Unlike traditional medical metal materials, biological tissues grow on tantalum after implantation for a period of time, just like they grow on real bones. So tantalum is also called "metallophilic"
Appropriate modulus of elasticity
Tantalum with special pore structure has elastic modulus between human cancellous bone and cortical bone, which is especially suitable for bone replacement, joint replacement and human tissue filling.
Tantalum can be made into a 0.2mm diameter filament, which can be used as an anti tension suture for easy sterilization and less stimulation of surrounding tissues for clinical operation.
When fracture or nonunion occurs in upper and lower limbs or other parts, tantalum metal can be made into tantalum pieces of different shapes and sizes to repair the fracture and nonunion, so as to achieve functional healing.
Because of the strong ductility of tantalum, the diameter of tantalum wire made from tantalum wire can adapt to its fluctuation in artery, and achieve accurate and rapid release. Some scholars used the small pig's coronary artery as the research model to make tantalum wire stent into the body for 6 months. The results showed that after the stent implantation, there was no rejection phenomenon in the local tissue of the coronary artery, and the neointima appeared the phase proliferation change.
Porous tantalum joint
Porous tantalum has obvious advantages in the use of joint materials. Because tantalum metal has certain elasticity, when it interacts with cortical bone, it can produce slight deformation without fragmentation. In addition, the friction coefficient of tantalum metal is higher than other metals, so the stability of tantalum metal after implantation is relatively high.
Tantalum coated products
Many metal materials can be used in the medical field due to their unique properties, but due to their lack of biocompatibility, they can not be used in clinical applications. Now, we can apply the tantalum metal with strong corrosion resistance and stability to the surface of these metal materials, so that those metal materials with unique performance but originally avoided low biocompatibility and could not be used in clinical use again.
Contact: Alex Li
Phone: （微）18690401137 QQ 2244385626
Add: Middle of Baotai Road,High-tech Zone, Baoji City,Shaanxi Province,China.