What are the advantages of carbon fiber medical devices?

Dec 10, 2022

Carbon fiber composites are widely used in various industries due to their light weight, high strength, high stiffness and other characteristics. The application of carbon fiber medical devices began in the 1960s, when it was found that carbon materials have excellent anti coagulation properties in the research of anti coagulation materials for artificial blood vessels. After 1970, carbon fiber composites attracted extensive attention in the medical field after the pioneering proposal to use carbon materials as biomedical devices.
At present, functional fibers, intelligent fibers and some high-performance fibers in high-tech fibers are widely used in various fields of medicine. Among them, medical grade carbon fibers and their composites, hollow fiber separation membranes, nanofibers and their nonwovens, carbon nanotubes, etc. are all important varieties in the medical field.
Carbon fiber medical devices
Next, we will introduce the application advantages of carbon fiber materials in the medical industry.
1. Excellent mechanical properties of carbon fiber
Carbon fiber composites have the characteristics of high strength, light weight, high specific strength and specific modulus; In medical equipment, it can be used for accessories with good rigidity and light weight requirements. For example, carbon fiber stretchers, carbon fiber wheelchairs, etc. are light in weight and high in strength, which are convenient for users to carry and operate.
2. Anisotropy and designability of carbon fiber
Some parts of medical equipment have very small deflection and high rigidity after being loaded in a certain direction; Carbon fiber reinforced resin matrix composites can have significant anisotropy, that is, there is significant performance difference along the fiber axis and perpendicular to the fiber axis. The anisotropy of materials brings greater freedom to the design.
3. X-ray transmission of carbon fiber
The intensity attenuation or absorption degree of the X-ray after penetrating the material is related to the composition, atomic number, density and thickness of the material. The aluminum equivalent of carbon fiber composite is 0.11, and the aluminum equivalent of carbon fiber composite foam sandwich structure is 0.52. The X-ray transmission performance is much better than that of traditional medical materials such as aluminum plate, plywood and phenolic resin plate. For carbon fiber composites, the element composition of resin is C, H, O, and the element composition of carbon fiber is C. The X-ray mass absorption coefficient is very small, far lower than that of ordinary materials. In addition, the carbon fiber composite material allows the ray to shine on the bed plate at any angle without refraction.
When applied to CT diagnosis, it can not only reduce the use of X-ray, but also make the diagnosis results clearer and more accurate.
4. Good fatigue resistance of carbon fiber
Due to the large amount of patient diagnosis and treatment, the fatigue performance of the bed panel is required to be high. There are countless fiber/resin interfaces in carbon fiber reinforced resin matrix composites. These interfaces can prevent further crack growth, thus delaying the occurrence of fatigue failure. In the process of use, even if the overload of composite components causes a small amount of fiber fracture, its load will be rapidly redistributed to the undamaged fiber, so that the entire component will not lose its bearing capacity in a short time, indicating that the structure has good damage safety.

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