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Mechanical stability of elastomeric polymers for blood pump applications
Journal of Biomedical Materials Research
|February 1, 1985
Summary
Biomer and Toyobo TM5, both segmented polyether polyurethanes, demonstrate superior mechanical stability and flexibility, making them ideal for cardiac prostheses components.
Area of Science:
- Biomaterials Science
- Polymer Engineering
- Cardiovascular Engineering
Background:
- Elastomeric polymers are crucial for cardiac prostheses.
- Understanding their mechanical properties is vital for device longevity and patient safety.
Purpose of the Study:
- To evaluate the static and dynamic mechanical properties and stability of five elastomeric polymers.
- To identify suitable materials for flexible components in cardiac prostheses.
Main Methods:
- Uniaxial tensile and fatigue tests were conducted.
- Testing environments included air at room temperature and 37°C saline solution.
- Mechanical characteristics such as flexibility, strength, and elastic modulus were analyzed.
Main Results:
- Biomer exhibited high flexibility and exceptional stability during cyclic deformation in both tested environments.
- Toyobo TM5 showed higher strength and ductility than Biomer, but with slightly less flexibility and stability.
- Texin MD85A offered low flexibility and high strength, while Hexsyn was highly flexible but mechanically unstable.
- Avcothane 51 demonstrated unstable properties and stiffened with cyclic deformation.
Conclusions:
- Biomer and Toyobo TM5 are the most suitable materials for flexible cardiac prostheses components due to their favorable mechanical profiles.
- Material selection requires balancing flexibility, strength, and long-term stability under physiological conditions.