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Resources > Whitepapers > The Importance of Transformation Temperature Testing of Nickel Titanium Wire

The Importance of Transformation Temperature Testing of Nickel Titanium Wire used in Medical Devices

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US BioDesign is proud to be leading the biomedical industry with research, innovation, and development in medical fabric and medical textiles.

Our latest whitepaper—entitled "The Importance of Transformation Temperature Testing of Nickel Titanium Wire used in Medical Devices"—is focused on opportunities 

"The Importance of Transformation Temperature Testing of Nickel Titanium Wire used in Medical Devices" can be read online by clicking on one of the four parts below and is also available as a PDF. 

Part One: Introduction and Ingot Transformation Temperatures

Nitinol alloys enjoy an ever-increasing popularity as a proven biomaterial for the manufacture of medical devices, primarily due to its unique shape memory and superelastic properties. Stents (vascular and nonvascular), along with other devices, rely on Nitinol’s transformation temperatures for their performance inside the human body.

Click here to read Part One

Part Two: Material and Secondary Processing

During wire processing, the transformation temperatures will be affected primarily by cold working and annealing temperatures. Cold work, specifically, has a great effect on the achievable transformation temperatures for the final device. In general, higher cold work percent leads to colder transformation temperatures and higher plateau stresses. 

Click here to read Part Two

Part Three: Controlling the Heat Treatment Process

Heat treatment of Nitinol alloys is dependent on a variety of factors, and controlling and understanding their connection to each other is vital for repeatability of the process. Analyzing the wire manufacturer’s certification to assess ingot transformation temperatures is the first step in identifying the correct heat treatment for the application.

Click here to read Part Three

Part Four: Finished Device Testing

“Finished Product” is defined as material that will undergo no further processing. In the case of braided nitinol devices, final properties are achieved after final heat treatment. Active Af temperature is a very good indicator of other properties, such as lower plateau strength, and can be used as a benchmark for product confirmation

Click here to read Part Four