Key result
Increasing temperature and water absorption softened polyamide 12, reducing Young's Modulus and yield stress, whereas the necking process increased Young's Modulus by 43.5%.
Why the study?
To enable design innovations and better understand catheter mechanics under high pressures and insertion or withdrawal loads, the tensile properties of polyamide 12 were investigated.
Population
PA 12 dog bone specimens and medical PA 12 tubes
Comparison
Water conditioning vs ambient storage, different temperatures, and necking process effects
Design
In vitro biomechanical material testing study
Authors
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Reduced PA12 tube properties may affect catheter integrity under load; leaves open need for clinical validation of design impacts.
Environmental conditions like temperature and humidity, as well as pre-forming processes like necking, significantly influence the mechanical properties of PA 12 used in PTCA balloon catheters, highlighting the need to account for operating temperature during catheter design.
Amstutz et al. (2021) studied this question. Temperature, humidity conditioning, and necking vs. Standardized specimens at ambient conditions was evaluated on Tensile properties (Young's Modulus and yield stress). Increasing temperature and water absorption softened polyamide 12, reducing Young's Modulus and yield stress, whereas the necking process increased Young's Modulus by 43.5%.
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