1. MRI INFUSION PUMP Group Members: Aman Ghotra – Team Leader
Can Pi – Communicator
Miguel Benson - BSAC
Prakash Rao – BWIG
Client:
Dr. George Newman, Ph.D.
Frank Hospod
Advisor:
John Webster, Ph.D.

3. OUTLINE Problem Statement Client’s Requirements Designs 1-3
Spur Gear
Vane Pump
Peristaltic Pump
Decision Matrix
Stepping Motor
Design Proposal
Future Goals

4. PROBLEM STATEMENT
Current MRI compatible infusion pumps are syringe-driven
Limitations:
Flexibility in programming
Saline and gadolinium capacities (60 mL and 60 mL, respectively)
Time Consuming (~7 min)

5. CLIENT REQUIREMENTS The pumps must: Be made of a non-ferrous material
Minimize gadolinium or saline waste
Deliver accurate flow rates
(0.2-4 mL/s, ± 0.02 mL/s)
Be easily sterilized and durable
Be programmable
Sequence: saline→bolus →saline →infusion →saline
Manage time to produce consistent images
Attach to containers (60/180 mL)

6. SPUR GEAR PUMP A pair of matched gears rotate in opposite directions.
The air pockets created by the rotating gears draw in the liquids.
The fluid exit at the outlet of the gear.

7. PROS & CONS PROS Low cost Simple Reliable Efficient CONS
Hard to sterilize
Sanitizing solution
Replacement

8. VANE PUMP

9. VANE PUMP (cont.) Cost Varies greatly $174 - $2993 Parts Rotor
Vane plates
Casing

10. PROS AND CONS Cons Pros Complex Develops good vacuum
Not for thick liquids
Contamination possible
Hard to Clean
Pros
Develops good vacuum
Good with thin liquids
Can change displacement and angle

11. PERISTALTIC PUMPS Flow rate controlled by roller clamp
Tube walls squeezed to form seal as roller moves along tube
More rollers increase accuracy

12. PERISTALTIC PUMPS (cont.)
Positive Displacement Pump
Used in a variety of medical applications

13. PERISTALTIC PUMPS (cont.)
Accuracy decreases as tubing wears and loses flexibility
BUT, tubing will be changed after every patient
Very sterile – no external contact with fluid
Typical price range: $170+

14. DESIGN EVALUATION Maintenance Efficiency Cost Accessibility Total
Spur Gear Pump 1 2 3 8
Vane Pump 6
Peristaltic Pump 11
0 – worst; 3 - best

15. STEPPING MOTORS Converts electrical energy into motion
Characteristics:
Voltage = Torque
Low cost ($60 & up)
Easily programmable
C/C++ Program
Labview

16. DESIGN PROPOSAL Alternative:
If we can’t find out how to deshield the pump/motor case:
We will have the motor in the control room and connect this with the rest of the apparatus through the wall.

17. FUTURE GOALS Work on budget with client Buy parts to assemble pump
Buy an economical Stepper Motor
Learn programming
Figure out deshielding options/nonferrous materials

18. Questions?