Biolääketieteen kenttä

1, Medical Tini shape memory alloy should not only utilize its shape memory effect or super elasticity, but also meet the requirements of chemistry and biology. Good biocompatibility. tini can form a stable passivation film with the organism.

2, at present, Tini alloy is mainly used in medicine, dental orthodontic wire: the use of superelastic Tini alloy wire and stainless steel wire as dental orthodontic wire, of which superelastic Tini alloy wire is the most suitable. Stainless steel wire CoCr alloy wire is usually used in orthodontics, but these materials have the disadvantage of high modulus of elasticity and small elastic strain. In order to give proper orthodontic force, the arch should be machined before orthodontic treatment and ligature fixation requires skillfulness. The use of Tini alloy as orthodontic wires does not result in plastic deformation even at strains as high as 10%. In addition, the stress-induced martensite makes the modulus of elasticity nonlinear, i.e., the orthodontic force fluctuates very little when the strain increases. This material is not only easy to operate and effective, but also reduces patient discomfort.

3, scoliosis correction: all kinds of scoliosis (congenital, habitual, neurological, shaking, idiopathic, etc.) not only suffered serious physical and mental injuries, but also the internal organs are compressed, and need to be surgically corrected. Currently, this operation is made of stainless steel Hayden rods. When the rods are placed in the operation, the orthodontic force holding the spine in place should be kept below 30-40 kilograms. Once the force is too high, the rods will be destroyed. This will not only damage the spine, but also the nerves. Also, the orthodontic force varies over time after insertion of the rods. When the orthodontic force drops to about 30% of the initial value, another surgery is needed to adjust the orthodontic force, which brings great physical and mental pain to the patient. The Harrington bar made of shape memory alloy can be fixed by placing the orthodontic bar only once. If the orthodontic force of the bar changes, adequate orthodontic force can be restored by heating the shape memory alloy in vitro and raising the temperature to about 5°C above body temperature.

4, In addition, Tini shape memory alloy can also be used to make a variety of bone joints, vascular clips, coagulation filters and vasodilator elements. It is widely used in dentistry, orthopedics, cardiovascular, thoracic surgery, hepatobiliary, urology, gynecology and so on. With the development of shape memory, medical applications will be more extensive.