Results 141 to 150 of about 12,334 (194)

Thermodynamics of Nitinol

Journal of Applied Physics, 1987
A self-consistent macroscopic thermodynamics is developed for the calculation of work, heat, and dissipation for thermodynamic paths of the shape memory alloy, Nitinol. The thermodynamic system analyzed is a Nitinol helix for which extensive force–length–temperature (FLT) equation of state measurements have been made.
J. L. McNichols, J. S. Cory
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Fatigue and durability of Nitinol stents

Journal of the Mechanical Behavior of Biomedical Materials, 2008
Nitinol self-expanding stents are effective in treating peripheral artery disease, including the superficial femoral, carotid, and renal arteries. However, fracture occurrences of up to 50% have been reported in some stents after one year. These stent fractures are likely due to in vivo cyclic displacements.
A R Pelton, A R Pelton, M R Mitchell
exaly   +3 more sources

Nitinol for Prosthetic and Orthotic Applications

Journal of Materials Engineering and Performance, 2011
As global populations age, conditions such as stroke and diabetes require individuals to use rehabilitation technology for many years to come due to chronic musculoskeletal, sensory, and other physical impairments. One in four males currently aged 45 will experience a stroke within 40 years and will often require access to prolonged rehabilitation.
Buis, Arjan, Henderson, Emma
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Bending characteristics of nitinol wire

American Journal of Orthodontics, 1979
U ntil recently only a limited group of alloys have been used for orthodontic wires, namely, gold-caper, austenitic stainless steel, and chromium-cobalt-nickle (CrCo-Ni) based materials. In general, the last two groups have similar mechanical properties although processing, stress-relieving, heat-treating, and minor alloying adjustments allow for small
I, Lopez, J, Goldberg, C J, Burstone
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Nitinol in Magnetic Resonance Imaging

Minimally Invasive Therapy & Allied Technologies, 2004
Surgical and interventional instruments as well as implants can cause significant magnetic resonance image (MRI) artifacts. The artifacts can be used to visualize instruments, cannulae, guide wires, catheters during interventional MRI and Nitinol devices have proven to be useful for MRI procedures. Diagnostic imaging is often compromised in the area of
, Melzer, , Michitsch, , Konak, , Schaefers, Th, Bertsch   +4 more
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Fatigue Fracture of Nitinol

Journal of Failure Analysis and Prevention, 2021
Abstract Nitinol fatigue fracture surfaces generally exhibit similar features to most engineering alloys, including a flat fracture plane, ratchet marks, radial lines, beachmarks, and striations.
Louis G. Malito, Matthew L. Bowers, Paul L. Briant, Gabriel S. Ganot, Brad James   +4 more
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Chemical etching of Nitinol stents

Acta of bioengineering and biomechanics, 2013
Acta of Bioengineering and Biomechanics; 04/2013; ISSN 1509 ...
Katona, Bálint, Bognár, Eszter, Berta, Balázs, Nagy, Péter, Hirschberg, Kristóf   +4 more
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Metallographic method for nitinol

Metallography, 1985
Abstract It is demonstrated that for the alloy Ni-Ti, mechanical polishing followed by electrolytic polishing using a jet polisher such as the Struers Tenupol produces areas suitable for microscopical examination of the structure with polarized light illumination.
L.A. Middleton, N.F. Kennon, D.P. Dunne
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Enhanced Nitinol Properties for Biomedical Applications

Recent Patents on Biomedical Engineeringe, 2008
In recent years, Nitinol producers and medical products have experienced an exponential growth, driven by advanced manufacturing techniques and the use of progressively less invasive medical procedures. Concurrently, new processing techniques have been developed to further enhance the valuable properties of Nitinol used in medical devices; recent ...
BISCARINI, Andrea, Mazzolai G., Tuissi A.   +2 more
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Susceptibility of nitinol to localized corrosion

Journal of Biomedical Materials Research - Part A, 2006
AbstractThe effect of different conditions on the susceptibility of nitinol to localized corrosion was examined using the cyclic potentiodynamic polarization technique. Tests were performed on mechanically polished (MP) and electropolished (EP) nitinol wire in 0.9 wt % NaCl and phosphate‐buffered saline (PBS). A polarization curve was also obtained for
exaly   +3 more sources