Intercambio de información sobre las propiedades de fatiga de los materiales AKSOPEEK de grado de implantes médicos
PEEK fatigue propertiesThe phenomenon that materials, parts and components will produce local damage at one or some points under cyclic loading, and form cracks after a certain number of cycles, or the cracks will further expand until they completely break. Fatigue performance refers to the ability of materials to resist fatigue [1].
Today, let’s talk about the fatigue properties of PEEK. Using the YY/T 1503 (ASTM F382) test standard, we conducted a bending fatigue test on the AKSOPEEK LCF plate (4mm thick) at a load of 800N, a frequency of 5Hz, and a test number of 1.2 million times. The performance is comparable to that of titanium alloy and better than pure titanium.
In order to further compare the fatigue strength of AKSOPEEK LCF and titanium alloy, we selected four groups of 2mm thick titanium alloy Ti-6Aal-4V) and AKSOPEEK LCF splines for fatigue testing under 382N. The four groups of AKSOPEEK LCF did not fail after 1 million fatigue cycles, while the titanium alloy failed due to fatigue at 73,000, 82,000, 79,000 and 92,000 cycles respectively.
Using the YY/T 0959 (ASTM F2077) test standard, the AKSOPEEK Natural intervertebral fusion cage (H is 6.3mm) was subjected to compression fatigue testing at a load of 2000/4000N, a frequency of 5Hz, and a test number of 5 million times. No failure due to fatigue occurred. Static testing before and after fatigue also did not show any reduction in strength, and this model of fusion cage would only show compression yield at 12000N.
Deeply cultivating sports medicine
Changzhou Junhua Medical Technology is a wholly-owned subsidiary of Junhua PEEK. It has established a special team to cooperate with customers in the medical industry to be responsible for the research and development, production and sales of medical polymer materials and products such as medical PEEK, PPSU, LCF/PEEK thermoplastic composites.
In 2021, Changzhou Junhua Medical will actively cooperate with major domestic medical institutions to develop sports medicine molds to meet the development needs of domestic sports medicine, which has the following advantages:
(1) Many years of experience in PEEK injection molding;
(2) Complete sports medicine development process;
(3) The same brand and model of micro injection molding machines can be seamlessly switched with competitors;
(4) The perfect after-sales service system is recognized by major domestic medical institutions.
Based on the present and looking to the future. In 2021, Changzhou Junhua Medical officially launched the implantable PEEK project and is in the second round of inspection. The results of the inspection will be announced around August 2022. In order to better standardize implantable PEEK, a new implantable AKSOPEEK series brand will be added.
1) AKSOPEEK Natural: Implant-grade PEEK pure material;
2) AKSOPEEK HA: Hydroxyapatite improves the biocompatibility of implantable PEEK materials;
3) AKSOPEEK CF: Chopped carbon fiber implant grade PEEK material;
4) AKSOPEEK LCF: continuous carbon fiber implant grade PEEK material;
Note: [1]. Fatigue, Baidu Encyclopedia.
