Titanium Straight Wire

Fracture feature

The product fracture starts from the micro crack on the surface of the wire, the crack expansion zone and the instant fracture zone are flat dimples, the fracture is brittle fracture, and the fracture is brittle fracture caused by notch sensitivity.

Cause analysis of microcrack

After the heat setting of the braided product, the phenomenon of broken wire and bending appeared in the waist, and the crack source of broken wire started from the micro-crack area on the surface of the wire, and there were micro-cracks in the bending area, indicating that there was a large local stress of the wire, resulting in plastic deformation leading to micro-cracks.

Analysis of stress source of wire
According to the analysis of the production process of the product, the NiTi alloy wire needs to be fixed in the mold after weaving, and then the heat setting treatment (setting and stress relief). Because the heat treatment is not done in time, the sample is subjected to the extrusion stress of the mold for a long time, which causes local micro-cracks in the waist wire of the product.

In the process of braided shaping, the shaping stress of the sickle titanium wire is not eliminated in time, resulting in plastic deformation in the local area of the wire, resulting in micro-cracks, resulting in brittleness of the sickle titanium wire. It is recommended to fix the product into the mold and conduct heat setting treatment in time to prevent the damage of the wire caused by the extrusion stress of the mold

The benefits of using titanium alloy for medical devices are:

1. The instrument is light in weight, which can reduce damage to blood vessels, muscles and organs during surgery and reduce doctor fatigue. Medical titanium instruments are more suitable for delicate microsurgery;

2. Good corrosion resistance, non-toxic, equipment does not rust, wounds are not easy to get infected, and wounds heal quickly;

3. Titanium straight wire is very flexible in medical applications and can be used to produce medical tweezers and other surgical instruments

4.Usually when working under the operating room shadowless lamp, titanium material is less reflective than stainless steel, and titanium material is easy to operate

Medical titanium medical devices mainly include scalpels, surgical forceps, surgical forceps, chest expanders, suture needles, sutures, etc. Medical titanium wire is used as surgical sutures, and other materials (if not stainless steel wire) have the advantages of small tissue reaction and good torsion resistance. After suturing, the surgical wound is less prone to inflammation, and the bone suture site is less likely to shift. Sutures are generally made of medical titanium wire (TA1 or TA2 wire) with a diameter of 0.5 to 0.8 mm.Another point that needs to be mentioned is that Nitinol wire has soft properties and can promote wound healing