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MRI Infusion Pump

MRI Infusion Pump. Ryan Augustine Megan Buroker Tim Eng Nate Gaeckle Gordy Lawrence Christine Weisshaar. Background Information. Magnetic Resonance Imaging Protons from water molecules Gadolinium (contrast) controls the water molecules Saline flushes Bolus vs. Infusion

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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

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