170. the esophageal deflection device

Department: Mechanical & Aerospace Engineering
Faculty Advisor(s): Frank E. Talke

Primary Student
Name: Karcher William Morris
Email: k6morris@ucsd.edu
Phone: 858-534-6196
Grad Year: 2019

Student Collaborators
Scott Garner, Scgarner@eng.ucsd.edu

An esophageal deflection device is being developed to assist cardiologists who perform left atrium catheter ablation procedures for atrial fibrillation patients. As the heart tissue is thermally ablated, it is possible the esophagus is damaged while it presses up against the heart. We have designed a novel device using SolidWorks and developed a functional prototype using various 3D printing techniques. The device consists of an inherently deflected overtube and relatively stiff insertion piece. A cardiologist will insert the fully assembled device and simply pull the insertion piece to deflect the over tube and esophagus away from the heart. Knowledge of material properties is of high importance during the design process for these 3D printed components. We have performed uniaxial and biaxial material tests to more fully understand the hyperelastic behavior of a material jet 3D printed photopolymer. The characterization of the material?s hyperelastic profile has been implemented in finite element analysis using an exemplary esophageal deflection device. Finite element analysis is also used to Ex vivo tests have been performed pig heart and esophageal tissue to validate our results. Further testing is planned so that we can translate our device from bench to bedside.

Industry Application Area(s)
Life Sciences/Medical Devices & Instruments | Materials

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