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 Dielastic Actuators
Often contains metal material
Cannot be next to scanner
Dielastic Actuators
Malleable capacitors
Elongates  used to propel gears
New, not on market

12. 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
To Patient
Pumps
Saline
Contrast
Y Connector

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

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