MRI Infusion Pump - PowerPoint PPT Presentation

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MRI Infusion Pump

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  1. MRI Infusion Pump • Ryan Augustine • Megan Buroker • Tim Eng • Nate Gaeckle • Gordy Lawrence • Christine Weisshaar

  2. Background Information • Magnetic Resonance Imaging • Protons from water molecules • Gadolinium (contrast) controls the water molecules • Saline flushes • Bolus vs. Infusion • Spectris Solaris • Wastes Gadolinium and Saline • Unable to supply different flow rates while in use • Creates a large gap between bolus and infusion

  3. Images

  4. Product Requirements • No Ferrous Metals can be exposed • Must supply a flow rate between .25 mL/s and 5 mL/s • Control with ease • Change infusion flow rates • Computer software • Maintain sterility • Move on to infusion immediately after bolus • Decrease waste of Gadolinium and Saline • Reliability • 2-3 protocols per day • Daily Usage

  5. Proposed Design

  6. Finger Pump • Fingers oscillate to transport fluids • Operated by a camshaft or solenoid • Easy to keep sterile

  7. Gear Pump • Simple mechanism • Gears rotate to transport fluids • Difficult to maintain sterility

  8. Peristaltic Pump • Motor rotates segments that move fluids • Creates a vacuum • Easy to keep sterile • Proved itself in medical applications

  9. Motor • Bell-type armature motor • Non-ferrous • Symmetrically balanced permanent magnet • Speed linearly proportional to voltage

  10. Problems and Future Considerations • Magnetic shielding for servo motors • MuShield • Calculations for desired operation • Torque needed by motor • Diameter of tubing • Properties of the two fluids

  11. Alternatives • Motor Driven Pump • Often contains metal material • Cannot be next to scanner • Dielastic Actuators • Malleable capacitors • Elongates  used to propel gears • New, not on market

  12. Saline Contrast Pumps Y Connector To Patient Our Solution • Stand: Holds standard size bags of saline and contrast at top • Pump attaches to bag • Tubing attaches to pump • Come together with a Y connector • Both fluids flow to patient

  13. The Pump… • Peristaltic Pump • Aluminum or titanium rollers • Rollers propelled by gears • Gears driven by pressure acting as motor • Air, Water, Nitrogen, Oxygen, CO2

  14. Pressure Pressure Saline Line Contrast Line Pressure Pressure Rollers Gears to control roller spin rate To Patient Broader View:

  15. Problems • MRI interference • Running cables from control room • Safety of propelling gears

  16. Advantages • Saving money • Set-up time reduced • Preparation minimal • Allows bolus & infusion to take place during same scan

  17. Design Option 1 • Use a force driven syringe pump • Force source possibilities • Gravity, gas under pressure, elastic materials, liquid under pressure, or dielastic actuators

  18. Design Option 2 • Peristaltic pump powered by a flywheel and gear system • Allows great flexibility when choosing type of power source • Minimizes potential for air bubbles • Easy to sterilize • Can be made with nonferrous materials

  19. Design Option 3 • System applying force to bag reservoirs. • Will be difficult if not impossible to determine outflow volume with a changing bag volume. • How to apply force throughout the procedure as the bag is reduced in size?

  20. References • http://www.maztravel.com/enrique/tour3.html • http://www.animatedsoftware.com/pumpglos/pumpglos.htm • www.medrad.com • www.edmond/wheelchair.com/i_v__stands.htm