Chocolate cookies biscuit dipped with a glass of milk.
How to Measure Volume
Measuring the volume of a standard shape (e.g. cube, cylinder, sphere) is straightforward, as one only needs to measure the relevant dimensions (length, height, diameter, etc.) and calculate the volume using known geometric equations. Measuring a non-standard shape is also straightforward if you have an analytical balance. Using Archimedes’ principle of buoyancy, the weight of […]
DJO Announces Plans to Launch Vitamin E Polyethylene Knee Implant
DJO Global announced that it will be launching its Motivation(tm) total knee system at the American Academy of Orthopedic Surgeons meeting in 2013. The Motivation System incorporates e+(tm), an UHMWPE blended with Vitamin E. Source: DJO
FDA Regulation of New UHMWPE Components
Dr. Michael Kasser, from Center for Devices and Radiological Health at the FDA, has published an article in the Journal of Biomedical Material Research detailing the history of regulation on ultra high molecular weight polyethylene (UHMWPE) and its use in medical devices. This article is available as a early view download for registered users. Dr. […]
Iconacy Orthopedic Implants Gets FDA Clearance on Cima
Iconacy Orthopedic Implants, a privately held medical device company in Warsaw, IN, received FDA clearance to market their highly crosslinked UHMWPE prepared using the CIMA process developed at Cambridge Polymer Group and the Massachusetts General Hospital. CIMA is a patented highly crosslinked, low wear and oxidation-resistant ultra high molecular weight polyethylene that is non-exclusively licensed […]
Mooney Rivlin Testing
The Mooney-Rivlin model is a hyperelastic model that can be used to predict the deformation behavior of elastomers to uniaxial, planar, and biaxial extension. This model requires knowledge of two or more Mooney-Rivlin parameters that are specific to the material in question, and usually to the deformation mode in question as well. Some experimental work […]
Nano-Patterning on Hip Replacements
The BBC reports that a team from Glasgow University has developed a technique to created a pitted nanopatterned surface using poly ether ether ketone (PEEK). Tissue growth studies conducted by this group has shown that the nanopattern helps to elicit bone growth through the manipulation of stem cells. These researchers feel that it they can […]
Presentation on Biomedical Applications of Hydrogels
The current standard of care in orthopedic joint replacement relies on the use of hard bearing surfaces comprised of polyethylene, ceramics, and metals. The natural tissues these synthetic materials replace are usually softer, viscoelastic materials that are best described as hydrogels, or hydrophilic network structures of cross linked macromolecules. In this audio conference presentation, our […]
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Tensile Strength of Fluids
Authors Lubansky et al from Swansea University in the UK analyzed the tensile strength of polyethylene glycol fluids using a CaBER(r) capillary breakup extensional rheometer. In this technique, a small aliquot of fluid is stretched rapidly between two endplates, and the resultant filament breakup kinetics are monitored with a high resolution laser micrometer. The breakup […]
Zimmer Vitamin E UHMWPE Cleared by FDA
Zimmer, Inc. has received FDA clearance on their highly crosslinked, Vitamin E containing UHMWPE. The 510(k) application is for a hip liner, and is being marketed under the trademarked name “Vivacit-E” (pronounced ‘vicacity’). Zimmer is advertising the new material in their Continuum acetabular shell system, shown above. Link to 510(k) Link to Zimmer Continuum Website
Synthetic Fat
Medical device and instrumentation design and development usually requires testing the prototypes in a simulated environment. Interest in treatments involving patients with high fat content has led to requests for tissue models containing a large amount of simulated fat. Using their skills in custom polymer formulations, researchers at Cambridge Polymer Group have developed a simulated […]