Impact Tests On Orthopedic Implants
A medical condition called Osteoarthritis is caused when there is minimal joint moment in human body. Lack of joint moment can result into damaged or dysfunctional joints. Orthopedic implants are designed to replace the damaged joint (s) and increase the mobility of an affected part in the human body. To name a few, implants used for hip, knee, shoulder or elbow joints are commonly made of stainless steel. It is important for manufacturers of such orthopedic implants to test their components (various implants) to characterize the impact resistance of their product.
Instron 9400 series is a good fit for such a testing requirement. Since the implants for various body parts are of different shapes & sizes, the testing has to be performed using various custom fixtures. We used a T-slot plate which was bolted at the bottom of 9450. A custom fixture with a clamped knee implant was mounted on the T-slot plate at base of the tower. A 45 kN strain gauge striker was used to impact the knee implant. A Data Acquisition System (DAS) and Bluehill Impact software were used in conjunction with the drop impact machine to collect the force/velocity data and analyze the impact performance.
Alternatively a general purpose plate as seen in the picture can be used instead of a T-slot plate.These versatile plates give flexibility to manufacturers to mount a wide range of custom fixtures as per their own requirements. Such impact tests can be customized to an extent where they can replicate the real life low and high velocity impacts during the actual surgical procedures.
Note: The customer's actual test set up is confidential and hence is not displayed in this application note.
Instron Drop Towers are used to develop, fine tune, and validate material models. Testing materials under real impact conditions is a crucial step prior of product design. Using the characterization data obtained with the Instron 9400, coupled with customer supplied high-speed video, you can have confidence in your results and deliver new materials to your customers faster. Our Drop Tower impact systems, fixtures, and tups are designed to meet a wide range of applications and testing standards including: ISO, ASTM, ANSI, Airbus, Boeing, BSI, DIN, EN, FDA, Ford, GM, JIS, NASA, GOST, and more.
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Bluehill® Impact is built from the ground up for touch interaction. The Operator Dashboard features large touchpoints to make the user experience simpler and smarter. Easy-to-understand icons and workflows make it easy to train new or experienced users, simplify operator training, and allow you to start testing even faster than ever before
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