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Aneurysm Model Prototype: Design Update

Aneurysm Model Prototype: Design Update. Sara Goldgraben Bill Hauser Michael Savarese Advisor: Dr. Strey Customer: Dr. Chen BME 441 Design April 3, 2006. Overview. Background Original Design Pre-manufacturing Modifications Initial Prototype Testing

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Aneurysm Model Prototype: Design Update

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  1. Aneurysm Model Prototype: Design Update Sara Goldgraben Bill Hauser Michael Savarese Advisor: Dr. Strey Customer: Dr. Chen BME 441 Design April 3, 2006

  2. Overview • Background • Original Design • Pre-manufacturing Modifications • Initial Prototype Testing • Post-Manufacturing Modifications • Additional Models • Near Future Experiments • Lab Setup

  3. Background • Required parameters • Aneurysm neck: 4mm • Vasculature diameter: 4mm • Aneurysm diameter: 7mm • Flow Velocity: 100cm/min • Transparent Housing • Optical data acquisition • Mechanically strong • Easily Disassembled • Maintenance • Weight measurement of polymer • Durable • Water-tight seals • Seal of aneurysm and input/output flow • Versatilityof Design • Reusability • Variable flow • Velocity • Steady/Pulsatile

  4. Original CAD Design • Size of materials • Plexiglas • O-rings

  5. Pre-Manufacturing Modifications • New Design • Size: 5in x 2in • Straight Fluid Flow • Mostly Seamless • Solid Machined Fittings • Improvements Over Original Design • Smaller Overall Dimensions • Eliminates long entry length • Less Material Used • Less Chance of Leaks • Solid Machined Fittings • Consultation with George Luhrs • Sizes are in closest American standard to our metric requirements • Overall Model Stems From 2D Model Idea • Double Plug • Single Plug • Added Handle with grip • O-ring Sealed Plug • High Tolerance Machined Plug

  6. Initial Prototype Testing • Prototype: High Tolerance Fitting • Results • Positive • Water-tight • Machined Barbed Fittings Work Well • Negative • Aneurysm Cracks • Opaque Tint • Requires Further Polishing

  7. Post-Manufacturing Modifications • Enlarged Plug • Larger Aneurysm Wall • Will reduce aneurysm weakness • Reduction of Opacity • Polishing • Mechanical • Cloth Tip • Wooden Tip (Plausibility not yet known) • Polishing Solution • Heat Based • Baking • Heated Ball Bearings

  8. Additional Models • Lateral Wall Aneurysm Models • 11mm and 13mm Aneurysm • 4mm vessel • Bifurcated Aneurysm • 10-11mm Aneurysm • 4mm vessel

  9. Near Future Experiments • Test Polishing Methods • Test Model with Polymer • Easily Cleaned • Sufficiently Transparent • No Optical Artifacts

  10. Lab Setup • Assembly • Safety Precautions • Barometer set up • Experimental setups • Static flow (reservoir is gravity driven) • Dynamic flow (pump) • Closed loop • Open loop

  11. Conclusion • Budget Breakdown • Pump = $400 • Plexiglas = $80 • Large O-Rings (Not being used) = $35 • Stand/Clamps/etc = $120 • Total so far = $635

  12. Acknowledgements • Professor Chen – Customer • Professor Strey – Advisor • George Luhrs – machined our product • Lester Orlick – Instructional Support Technician CEAS • Greg Pollard – APT Instruments

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