PSEUDOELASTIC POROUS SHAPE MEMORY MATERIALS FOR BIOMEDICAL AND ENGINEERING APPLICATIONS
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United States of America Patent
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Issued Date -
May 31, 2007
app pub date -
Sep 22, 2006
filing date -
Sep 23, 2005
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Abandoned
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Abstract
New porous shape memory materials with the use of different fabrication methods such as hot isostatic pressing technique are provided for biomedical and engineering applications. These new materials have a pseudoelasticity ranging from 0.1% to 50%. The mechanical properties of those materials can be adjusted from 1% to 10%. The pore distribution of these said materials is isotropic and homogenous, and their pore shapes can be tailor-made to be spherical or polygonal as avoiding stress concentration around the pores. The porosity and pore size can be controlled by fabrication process. These materials can exhibit superior pseudoelasticity and mechanical properties during testing than the other porous shape memory alloys fabricated by Self-propagating High-temperature Synthesis (SHS). These advance properties may apply to but not only limited to orthopaedic implants such as artificial bone graft, hip prosthesis and interverbal disc prosthesis; and also for engineering purpose such as damping devices.
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