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Experimental Tests on Fine Nitinol Wires Used in Medical Applications

Nitinol (NiTi) is a biocompatible nickel titanium alloy widely used in medical applications and devices. In anterior cruciate ligament (ACL) reconstruction surgery of the knee, fine wires of NiTi are used because of its high elasticity and good memory shape behavior. In surgical procedures these wires are exposed to mechanical stress and high deformations. This paper presents the results of the tests performed on fine NiTi wires of 1.1 mm and 0.73 mm in diameter, exposed to tensile load, which frequently appears in orthopedic surgery. The tests were done at a temperature of 37o C, in order to observe the influence of tensile stress on the mechanical properties of NiTi. The obtained material properties are in good correlation with data from manufacturers. These results are useful in durability evaluation of fine NiTi wires utilized in surgical procedures.