UMMC / University of Massachusetts Medical Center
Dr. Raymond Dunn
Current screw/plate sternal closure for patients after open-heart surgery requires bicortical fixation which is disadvantageous due to the proximity of the heart. The goal of this project was to design, model and test a single-unit unicortical screw and plate system which provides both lag and locking functionality. The final design utilizes a novel reverse splaying of the head to provide a locking mechanism following initial tightening. The design also allows the surgeon to properly locate and secure the bone to the plate prior to engagement of a locking mechanism. Cyclic shear loading will be used to compare the effectiveness of this screw design with standard non-locking unicortical and bicortical screws.
Worcester Polytechnic Institute
Major Qualifying Project
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