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Engineered Components

Engineered Components. Steering system Plate End cap Positioning rings Stabilizers String Placement Suction and lubrication systems Drill Stand. Problem Definition. Drill a curved hole through the spine Used for medical procedures i.e. spinal surgery, hip replacement, bone screws

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Engineered Components

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  1. Engineered Components • Steering system • Plate • End cap • Positioning rings • Stabilizers • String Placement • Suction and lubrication systems • Drill Stand

  2. Problem Definition • Drill a curved hole through the spine • Used for medical procedures • i.e. spinal surgery, hip replacement, bone screws • Improved patient recovery time • Less invasive anterior and posterior approaches • Increased mobility • Objectives • Angle of approach equal to 45° • Hole diameter of 5.5 – 7 millimeters

  3. Definition of Scoliosis • Condition that involves complex lateral and rotational curvature of the spine • Congenital – anomalies present at birth • Idiopathic – occurs during lifetime • Developed from other symptoms

  4. Current Scoliosis Treatments • Bracing is recommended when initial curve magnitude is between 20% and 40% • Reduction of curvature between 25 and 35degrees • Negative side effects of discomfort and psychological anguish • Surgical procedure involving screws and inserting metal rods to straighten the spine • Time consuming with a six month recovery time

  5. Budget

  6. Technical Approach • Procedures • Three phases performed concurrently • Design phase – design components • Build phase – assemble drill and model spine • Test phase – drill curved hole in spine • Milestones • Progress Report, Student Expo Presentation, Poster Presentation, Final Report, Delivery of Prototype

  7. Gantt Chart

  8. Prototype Components • Suction and Lubrication System

  9. Current Drill Prototype • Plate steering system • Three strings • Angle of strings to shaft: 15° , 30° , 45° , 60° • Cutting Head • Carbide burr

  10. Drill Stand • Concept drawing • Designed to hold drill during surgical procedure • To minimize number of hands needed to complete procedure • Placed on operating room tray

  11. 3-Phase Drilling • Phase 1 • Insertion into vertebrae • Phase 2 • Navigating the bend • Phase 3 • Directed drilling

  12. Material Testing • Drilled curved hole • Point- and Push-the-Bit • Compound curve • Model Spine • 2:1 scale • Represents layers of bone

  13. Deflection Testing

  14. Deflection Results

  15. Progress Challenges • Unexpected Technical Challenges • Drilling through plaster • Completing surgical procedure in one phase • Keeping drill level • Keeping tension in the strings • Modeling drill tip using mathematical equations

  16. Deliverables • Written technical progress report • Delivered [12/12/06] • Final drill prototype • [5/7/07] • Test model with drilled holes • [5/7/07] • List of further recommendations • [5/7/07] • Drawings and prints for future assembly (CD format) • [5/7/07] • Written final report • [5/7/07]

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