Inflatable Vertebral Body Distractor
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1 Inflatable Vertebral Body Distractor Client: Dr. Nathaniel Brooks Advisor: Prof. Mitch Tyler Ellis Cohen: Team Leader Joshua Plantz: Communicator Herman Feller IV: BSAC Joaquin Herrera: BWIG & BPAG
2 Overview Introduction Project Summary Final Design Testing Protocols Future Work
3 Problem Statement The goal of this project is to develop a minimally invasive inflatable vertebral body distractor for the lumbar region of the spine that can be easily manipulated and will not cause spinal fractures.
4 Background - The Spine Anatomy Vertebral Body Intervertebral Disc Function Structural Support Protect Spinal Cord Spinal Nerve Spinal Cord Disc Degeneration Fluid content within disc decreases over time result in wear and tear causes tiny tears or cracks
5 Background - Surgery Surgical Procedure: Insertion of operating needle Insertion of distractor Disc space is distracted Desired procedure Deflation and removal of distractor
6 Project Summary Last semester developed enlarged prototype for proof of concept Concept showed success Client has now given insertion size constraints Required a major decrease in size for the inserting process Developed testing methods Insertion MTS machine
7 Final Design: Inflatable Vertebral Distractor 49 mm long, 5.1 mm diameter Split into two parts: sheath and load bearing Three device system, composed of silicone based elastomer Sectioned view of inflatable distractor Full view of inflatable distractor
8 SolidWorks: FEA Applied Loads: Internal pressure of 120 psi Applied force of 143N Factor of Safety = 2.5 Maximum Displacement of 0.13 mm Von Mises Stress Graph Max stress of 363 psi
9 Final Design Continued Using Velowurks Floor Pump with gauge to pressurize distractor Pumps up to 250 psi Includes quick release valve
10 Testing Protocol-MTS Machine MTS testing to determine maximum compression load and sustainable pressure Loading the device in the MTS machine, a compressive load will be slowly applied as pressure is increased Once maximum load is determined, device will be left inflated with load to determine length of operation
11 Distractor Insertion Testing Model lumbar vertebrae with acrylic plates 2 acrylic plates- 10mm thick, 16mm outer diameter, 11mm inner diameter Model intervertebral disk with polyurethane rubber 1 polyurethane rubber disk- 5mm thick, 15mm diameter Glue acrylic plates to rubber disk A jamshidi needle and cannula with 5mm inner diameter will be used for insertion
12 Acrylic Plate Distraction Testing Once load and pressure testing is complete, test distraction capability Add constraints (i.e. rubber bands) to acrylic plates to create a vertebrae simulator Testing will be done to determine the strength and number of constraints needed to simulate force of vertebrae Once the simulator is developed, the device will be placed in between plates and inflated to test the distraction capability
13 Cadaver Testing Once the device has passed the MTS testing and the Acrylic Plate testing, it can be tested in a cadaver Using a human or an animal with similar spinal column forces Device can be inserted and inflated and tested in real environment This will give best indication of conflicts that are hard to visualize now
14 Future Work Complete testing protocols Create acrylic plate vertebrae simulator for testing Locate best angle and location for device implantation Determine best method of device removal
15 Acknowledgements Special Thanks To: Our client, Dr. Nathaniel Brooks Our Advisor, Professor Mitch Tyler
16 References "Polycarbonate Remains Proven and Preferred for Medical Applications." - Nasa Tech Briefs. N.p., n.d. Web. 25 Sept
17 Questions?
Inflatable Vertebral Distractor
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