Stents
Nitinol’s superelasticity and shape memory characteristics make it ideal for stent applications. When in its superelastic state—above its transition temperature—a nitinol stent can be compressed into a catheter, inserted into the target area, and then released to expand back to its original shape. Alternatively, the shape memory effect can be utilized by cooling the stent below its transition temperature before insertion; once inside the body, it warms and expands to its intended form.

Catheter Guide Wires
Nitinol has been used in catheter guide wires for over three decades. Its primary benefits include excellent kink resistance and a significantly smaller minimum bending radius—about one-tenth that of stainless steel. This flexibility makes nitinol ideal for maneuvering through complex and highly curved anatomical pathways.

Snares and Baskets
Nitinol is also used to create loop snares and expandable baskets for medical retrieval procedures. These tools can extract foreign objects from blood vessels or remove stones through endoscopic methods. For enhanced visibility under imaging, nitinol wires can be coated with highly radiopaque materials such as gold-plated tungsten.

Orthodontics
Nitinol is advantageous in orthodontic treatments because it delivers a consistent force across a wide range of deformations, mimicking the mechanical behavior of bone. This property means that braces made with nitinol wires need fewer adjustments than those using stainless steel, as they continuously apply even pressure on the teeth.

Orthopedic Fracture Fixation
In bone repair and fixation, nitinol offers several benefits over stainless steel and titanium. In addition to its superelastic and shape memory capabilities, nitinol has an elastic modulus close to that of natural bone, which helps evenly distribute mechanical stress between the implant and the bone, potentially improving healing outcomes.