Development of an Experimental Facility for the Testing of Cadaver Spine Specimens in Flexion and La

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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
DESIGN
DESIGN REQUIREMENTS

• 2 Separate Modes
• Compression/Bending
• Pure Bending
• Each mode has different upper mount
• Force measured at the piston on MTS Machine
• Loads variable during compression/ bending

OBJECTIVE/BACKGROUND

• Device must attach to the MTS 810 Test Frame
• Generate pure bending
• Allow for compression and bending
• Adaptable to different sizes of spine
• Easy to assemble attach to spine
• Easy to use
• Minimal frictional effects
• Reasonable Cost

• Spine injuries are commonly fixed with unique
  combinations of fasteners and hardware developed
  by the neurosurgeons.
• No method to test spinal attachments under
  bending loads
• This limits in determining the best combination
  for the spinal implants.
• As a result, there is a need for developing a
  procedure which would help fixing the problem.
• The main goal is to develop a testing platform
  which would help achieve pure bending and
  evaluate new implant designs for spinal injuries.
• The testing platform should attach with the MTS
  810 machine available on campus.

SPINE TESTING PLATFORM
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

• No standardize equipments available for testing
  corrective spinal attachments.
• Cost should not exceed 5000
• Our customers are IU School of Neurosurgery,
  Dr. Charles Turner, and Dr. Alan Jones.
  

• Von Mises Stress Analysis Performed on the
  critical parts.

CONCLUSION

• Testing Platform attaches to MTS 810
• Design for both the modes allows testing of spine
  specimens to study various load conditions
• Critical parts of the design meet stress
  requirements

RECOMMENDATIONS

• Build a prototype to test the design
• 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