There are several ASTM and ISO specifications that require Torque Testing;ISO 594-1, ASTM F543, ASTM 2502, F1541, and A938. There are also many medical device companies that could use a torsion testing system for R&D and prototyping. Many times, the axial forces are low, and the torque capacity is less than 50Nm. ADMET's 81T Torsion Tester comes in 1-100Nm capacity with dead weight pulley system to offset or to apply load to the sample. A Biaxial configuration, for both linear and torsional control, is available in single or dual column configurations at an additional cost.

UMass Biomechanical Research Relies on ADMET

Orlando, FL- October 5, 2010 – ADMET, Inc., a provider of integrated materials testing systems, is showcasing their line of single, dual, and biaxial testing systems at the North American Spine Society’s 25^th Annual Meeting. Booth #1891 The testing systems that will be featured are commonly used for testing biomedical materials and medical devices that require both static and dynamic testing profiles as well as uniaxial, biaxial, and long term fatigue.

Annex A1- ASTM F382-A1 measures the bending stiffness, bending structural stiffness, and bending strength from a single cycle bend test on a metallic bone plate.

Spinal Implants are tested according to several ASTM standards. ASTM F1717 is intended to provide a basis for the mechanical comparison among past, present and future spinal implant assemblies.  Three static and one fatigue mechanical test of a spinal construct are governed by ASTM F1717.  The three static tests are compression bending, tension bending and torsion.  The fatigue test is a compression bending test.  The mechanical tests are conducted using simplified loading schemes and do not attempt to mimic the complex loads of the spine.  An outline of the four test procedures is as follows:

The Orthopedic Tissue Engineering and Materials Lab at the University of North Carolina Charlotte (UNCC) was the winner of ADMET, Inc's 20 year anniversary celebration biomedical testing system giveaway. Drs. Ahmed El-Ghannam and Nigel Zheng at UNCC head a research team involved with the use of bioactive ceramic and bioactive ceramic-polymer composites as orthopedic fixation devices.  To fulfill their testing needs, ADMET has awarded the team an eXpert 81T 20 Nm (177 in-lb) Vertical Torsion Testing System equipped with the PC based MTESTQuattro® Materials Testing System and an immersion bath.

ASTM F543 Annex A2 is used to measure the torque required to drive a bone screw into a test block made of a rigid unicellular polyurethane foam. The results obtained from this test bear no direct correlation to the torque required to insert a bone screw in human or animal bone. This method is used as a quality control check for maintaining product uniformity.