MRI Infusion Pump

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

1. MRI Infusion Pump
By
SATHISHKUMAR G
([email protected])

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. 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. Broader View:
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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. Thank you