Development of an Experimental Facility for the Testing

Development of an Experimental Facility for the Testing of Cadaver Spine Specimens in Flexion and Lateral Bending Design Team: Pratik Sheth, Jason Colgan, Chirag Padalia, Manan Langalia ME 462 – Dr. Hazim El-Mounayri Sponsors – Dr. Alan Jones (ME), Dr. Charles Turner (BME) Spring 2008 OBJECTIVE/BACKGROUND v. Spine injuries are commonly fixed with unique combinations of fasteners and hardware developed by the neurosurgeons. v. No method to test spinal attachments under bending loads v. This limits in determining the best combination for the spinal implants. v. As a result, there is a need for developing a procedure which would help fixing the problem. v. The main goal is to develop a testing platform which would help achieve pure bending and evaluate new implant designs for spinal injuries. v. The testing platform should attach with the MTS 810 machine available on campus. DESIGN REQUIREMENTS v. Device must attach to the MTS 810 Test Frame v. Generate pure bending v. Allow for compression and bending v. Adaptable to different sizes of spine v. Easy to assemble & attach to spine v. Easy to use v. Minimal frictional effects v. Reasonable Cost SPINE TESTING PLATFORM DESIGN v 2 Separate Modes q. Compression/Bending q. Pure Bending v. Each mode has different upper mount v. Force measured at the piston on MTS Machine v. Loads variable during compression/ bending Figure 2. Design for Compression/Bending Mode (Model w/ the Exploded View) Figure 3. Design for Pure Bending Mode (Model w/ the Exploded View) COST & CUSTOMER TESTING/VALIDATION v. No standardize equipments available for testing corrective spinal attachments. v. Cost should not exceed $5000 v. Our customers are IU School of Neurosurgery, Dr. Charles Turner, and Dr. Alan Jones. v. Von Mises Stress Analysis Performed on the critical parts. CONCLUSION v. Testing Platform attaches to MTS 810 v. Design for both the modes allows testing of spine specimens to study various load conditions v. Critical parts of the design meet stress requirements RECOMMENDATIONS v. Build a prototype to test the design v. Perform the necessary tests to improve the testing platform to meet the design & cost requirements Figure 4. Stress Analysis on Critical Parts Figure 1. MTS 810