Magnetic Sensors Assist Surgeons

A recent achievement in biomedical technology is a magnetic sensor that enables orthopedic surgeons to find precise
alignments for metal implants used to repair broken bones.


Using the sensor, a surgeon will know the exact location for drilling holes in broken bone that line up with predrilled holes
in the implant.


Currently, surgeons perform bone implants using real-time X-rays as a guide. The problem with X-rays is harmful exposure,
which has motivated some doctors to seek an alternative.


According to the May 2005 issue of Mechanical Engineering, Carilion Biomedical Institute of Roanoke, Va., has developed a
prototype consisting of a fixed magnet placed in the hollow of the implant along with a handheld unit housing the sensors,
electronics, and drill sleeve.


In the procedure to mend a bone, the surgeon will guide the handheld unit until a liquid electronic display turns green,
indicating the sensors are centered over the magnet in the implant. With the drill holes aligned, the surgeon is then able to
drill through the bone.


Carilion says its device has been demonstrated on artificial femurs as well as on a cadaver. Carilion is currently
negotiating to license the technology, according to Mechanical Engineering, a publication of ASME.


To access the May 2005 issue of Mechanical Engineering, including the article "You Know the Drill," visit the ASME Web site
at asme.


Founded in 1880 as the American Society of Mechanical Engineers, today's ASME is a 120,000-member professional organization
focused on technical, educational and research issues of the worldwide engineering and technology community. In 2005, ASME
celebrates 125 years of continued service and leadership - setting the standard for professional engineering societies
worldwide.


ASME (American Society of Mechanical Engineers)

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New York, NY 10016-590

United States

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