Current biodegradable screws are made of polylactic acid, but those leave holes once they degrade. IFAM researchers developed a moldable composite made of polylactic acid and hydroxylapatite, a ceramic that is the main constituent of bone material.
IFAM engineers rely on conventional injection-molding methods, but they developed a granulate from the biomaterials with a net shape that results in a robust screw. The prototype's properties are very similar to a real bone's, with compressive strength of more than 130 newtons per square millimeter (a real bone withstands 130 to 180).
الجمعة، 5 مارس 2010
Medical screws that dissolve in the body
Traditional titanium metal screws used in orthopedic procedures have a number of disadvantages, not the least of which is triggering metal detectors at airports. Now a group of German researchers have developed screws that literally dissolve in the body.
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