What is the role of nitinol memory wire in medical devices?
志联
2025-03-19
What is the role of nitinol wires in medical devices?
1. Corrosion resistance
Studies have shown that the corrosion resistance of nitinol wire is similar to that of stainless steel wire.
2. Anti-toxic
The special chemical composition of nitinol shape memory alloy is that it is an atomic alloy, such as NiTinol titanium, containing about 50% NiTinol, which is known to cause and promote cancer. Typically, titanium oxide will act as a barrier layer on the surface, giving the Ni-Ti alloy good biocompatibility. The surface layers of TiXOy and TixNiOy can inhibit the release of Ni.
3. Gentle correction ability
Current applications of orthodontic wires include austenitic stainless steel wires, cobalt-chromium-NiTinol wires, NiTinol-chromium wires, Australian wires, gold wires, and titanium alloy wires. The load-displacement curves of these orthodontic wires under tensile and three-point bending test conditions.
4. Good shock absorption characteristics
The greater the vibration caused by chewing and nocturnal bruxism on the archwire, the greater the damage to the tooth roots and periodontal tissues. The results of different attenuation experiments show that the vibration amplitude of stainless steel wire is greater than that of superelastic nitinol wire, and the initial vibration amplitude of superelastic nitinol wire is only half that of stainless steel wire, so it has good vibration and impact absorption sex is crucial for dental health, and traditional archwires (such as stainless steel wires) exacerbate root resorption.
5. Superelasticity
Elastic superelasticity refers to the phenomenon that the strain of a sample under external force is far greater than the elastic limit strain, and it can automatically recover upon unloading. In other words, in the parent phase state, due to the action of external stress, stress-induced martensitic phase transformation occurs, so the mechanical behavior of the alloy is different from that of ordinary materials, its elastic limit is far greater than that of ordinary materials, and it no longer obeys Hooke's law. Compared with the shape memory characteristic, superelasticity does not involve heat. In short, superelasticity refers to the fact that within a certain deformation range, the stress does not increase with the increase of strain. Superelasticity can be divided into linear superelasticity and nonlinear superelasticity. The stress and strain of the former are almost linear in the strain curve. Nonlinear superelasticity refers to the result of stress-induced martensitic phase transformation and its reverse phase transformation during loading and unloading in a specific temperature range above Af. Therefore, nonlinear superelasticity is also called phase transformation pseudoelasticity. The pseudoelasticity of nitinol alloy can reach about 8%. The superelasticity of nitinol alloy can be changed with the change of heat treatment conditions. When the wire is heated above 400℃, the superelasticity begins to decrease.
6. Sensitivity to changes in oral temperature: Stainless steel wire and CoC
The orthodontic ability of alloy teeth is not affected by oral temperature. The orthodontic ability of high-elasticity nitinol orthodontic wires changes with changes in oral temperature. When the deformation is constant. As the temperature increases, the orthodontic ability increases. On the one hand, it can accelerate tooth movement, because changes in temperature in the mouth will stimulate the treatment device to produce blood flow at the site of blood flow stagnation caused by orthodontics, thereby allowing repair cells to be fully nourished during tooth movement to maintain their vitality and normal function. On the other hand, orthodontists cannot accurately control or measure orthodontics in the oral environment.
Keywords: Nitinol memory alloy flat wire_memory alloy wire_nitinol memory alloy plate_nitinol memory alloy wire_memory alloy flat wire_memory alloy plate_nitinol memory alloy
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