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Development of an apparatus for digital measurement of magnetically induced torque on medical implants to facilitate the application of the ASTM F2213 standard.

OBJECTIVE: The ASTM F2213 standard describes the measurement of the magnetically induced torques by means of a torsional spring method. As this method is highly complex, it has been rarely ever employed. The purpose was to develop an easy-to-handle measuring setup for the reproducible, fast and precise measurement of magnetically induced torques, following ASTM F2213, at a static magnetic field (B0 ) of 1.5 T and 3 T.

METHODS: An MR-safe measuring platform was developed according to the ASTM F2213 standard and combined with a precision balance. The evaluation was performed with 10 test objects, e.g. a steel screw (length 60 mm) and a neurostimulator, at 1.5 T and 3 T. The torque was measured at 10-degree increments as the test object was rotated relative to B0 .

RESULTS: The measurement setup allows fast and reproducible measurements. The maximum magnetically induced torque measured was 397 ±2 N·mm for the steel screw and 63 ±1 N·mm for the neurostimulator. The maximum torque on a test object is insensitive to B0 if the magnetization of the object has reached saturation.

CONCLUSION: Ferromagnetic implants may exhibit strong magnetically induced torques during MRI examination. For analyzing these magnetically induced torques, we developed a digital measuring device that allows simplified and accelerated application of the ASTM F2213 standard test method.

SIGNIFICANCE: In a B0 , ferromagnetic implants may exert considerable torques on the surrounding tissue. These forces may affect the functionality of the implant and inflict severe injuries on a patient.

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