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Application of titanium nickel memory alloy in medical treatment

Apr 22, 2017


Titanium nickel alloy after different treatment with these two characteristics with their own characteristics, the characteristics of the application to be made into medical, medical suture, suture on clinical requirements, without muscle injury, intradermal suture, suture to available temperature memory metal amorphous, amorphous without available super elastic metal suture wire wound healing after the wire out of reach, leaving no foreign body, the wound no hard edges, pinhole and other adverse conditions, no damage of medical products is a kind of surgery. Titanium nickel alloy after different treatment with these two characteristics with their own characteristics, the characteristics of the application to be made into medical, medical suture, suture on clinical requirements, without muscle injury, intradermal suture, suture to available temperature memory metal amorphous, amorphous without available super elastic metal suture wire wound healing after the wire out of reach, leaving no foreign body, the wound no hard edges, pinhole and other adverse conditions, no damage of medical products is a kind of surgery. The special properties of nickel titanium alloy, shape memory properties (shapememory) shape memory is when a certain shape by the parent phase above the Af temperature is cooled to a temperature below Mf martensite formation, the martensite under Mf temperature deformation, the following is heated to the temperature of the Af with the reverse transformation, the material will automatically restore its parent when the shape of. In fact, the shape memory effect is a thermally induced phase transition process. Super elasticity (superelastic) is called the super elasticity of the specimen under the action of the external force is much greater than the elastic limit of the strain of the strain, the strain can be automatically restored when unloading phenomenon. In the parent phase, due to the effect of applied stress, resulting in stress induced martensitic transformation occurs, thus the alloy exhibits mechanical behavior is different from the ordinary material, its elastic limit is far greater than the ordinary materials, and do not obey Hooke's law. Compared with the shape memory properties, superelasticity has no thermal involvement. In a word, the elasticity is the increase of the strain within a certain range of deformation, and it can be divided into two categories: linear superelasticity and nonlinear superelasticity. The stress and strain in the stress-strain curve are close to linear relationship. Nonlinear superelasticity is the result of stress induced martensitic transformation and its inverse phase transformation in the process of loading and unloading in a certain temperature range above Af. The phase transformation pseudo elasticity of Ni Ti alloy can reach about 8%. The superelasticity of NiTi alloy can be changed with the change of heat treatment condition. When the wire is heated to 400oC, the super elasticity will decrease. The sensitivity of temperature change in the oral cavity: the orthodontic force of stainless steel wire and CoCr alloy wire is not affected by the temperature in the oral cavity. The orthodontic force of super elastic NiTi alloy orthodontic wire changes with the change of oral temperature. When the deformation is fixed. The temperature increases, the correction force increases. On the one hand, it can accelerate the tooth movement, this is because the temperature changes in the mouth will stimulate the blood flow due to treatment device caused by capillary blood stagnation caused by stagnation bearing parts, so that in the process of moving tooth repair cells with sufficient nutrients, to maintain its vitality and normal function. On the other hand, it is impossible for the orthodontic doctors to control or measure the orthodontic force. Recently, there is a kind of non traumatic beauty skin suture needle, the needle is characterized by the end of the suture needle connected to a titanium nickel memory alloy wire as suture line, and plated with zinc. Because the memory alloy wire with temperature memory, when reaching the set temperature on the formation of the original line, showing the elastic properties of metal materials, this is the general metal materials do not have, by this way the skin suture, the surgical wound healing ideal. To suture setting, muscle banding, suture setting, muscle binding is the use of various needle to sum up, the stitches suture and joint strapping, like the same pull straight wire wound healing will be pulled out, so that the human body does not leave foreign bodies. The ability to pull out the wire is characterized by the temperature memory of the metal and the superelasticity.


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