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

Spectris Solaris Wastes Gadolinium and Saline Unable to supply different flow rates while in use Creates a large gap between bolus and infusion

Images

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

Proposed Design

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

Gear Pump Simple mechanism Gears rotate to

transport fluids Difficult to maintain

sterility

Peristaltic Pump Motor rotates

segments that move fluids

Creates a vacuum Easy to keep sterile Proved itself in

medical applications

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

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

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

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

The Pump… Peristaltic Pump Aluminum or titanium

rollers Rollers propelled by gears Gears driven by pressure

acting as motor Air, Water, Nitrogen, Oxygen,

CO2

Broader View:

Pressu

reP

ressure

Pressu

reP

ressure

To Patient

Saline Line Contrast Line

Gears to control roller

spin rate

Rollers

Problems

MRI interference Running cables from control room Safety of propelling gears

Advantages Saving money Set-up time reduced Preparation minimal Allows bolus & infusion to take place

during same scan

Design Option 1 Use a force driven

syringe pump Force source

possibilities Gravity, gas under

pressure, elastic materials, liquid under pressure, or dielastic actuators

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

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?

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