MRI INFUSION PUMP

Group Members:Aman Ghotra – Team LeaderCan Pi – CommunicatorMiguel Benson - BSACPrakash Rao – BWIG

Client: Dr. George Newman, Ph.D.Frank Hospod

Advisor: John Webster, Ph.D.

University of Wisconsin - MadisonBiomedical Engineering Design Courses

INTELLECTUAL PROPERTY STATEMENT

All information provided by individuals or Design Project Groups during this orsubsequent presentations is the property of the University and of the researcherspresenting this information. In addition, any information provided herein mayinclude results sponsored by and provided to a member company of theBiomedical Engineering Student Design Consortium (SDC). The above informationmay include intellectual property rights belonging to the University to which theSDC may have license rights.

Anyone to whom this information is disclosed:

1) Agrees to use this information solely for purposes related to this review;

2) Agrees not to use this information for any other purpose unless given writtenapproval in advance by the Project Group, the Client / SDC, and the Advisor.

3) Agrees to keep this information in confidence until the University and therelevant parties listed in Part (2) above have evaluated and secured anyapplicable intellectual property rights in this information.

4) Continued attendance at this presentation constitutes compliance with thisagreement.

OUTLINE

• Problem Statement• Client’s Requirements• Designs 1-3

– Spur Gear– Vane Pump– Peristaltic Pump

• Decision Matrix• Stepping Motor• Design Proposal• Future Goals

PROBLEM STATEMENT

• Current MRI compatible infusion pumps are syringe-driven

• Limitations:

a. Flexibility in programming

b. Saline and gadolinium capacities (60 mL and 60 mL, respectively)

c. Time Consuming (~7 min)

www.medrad.com

CLIENT REQUIREMENTSThe 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)

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.

http://www.mech.uwa.edu.au/DANotes/gears/meshing/meshing.html#top

PROS & CONS

PROS

•Low cost•Simple•Reliable•Efficient

CONS

•Hard to sterilize•Sanitizing solution•Replacement

VANE PUMP

http://www.animatedsoftware.com

VANE PUMP (cont.)

•Cost

•Varies greatly

•$174 - $2993

•Parts

•Rotor

•Vane plates

•Casing

http://www.animatedsoftware.com/

PROS AND CONS

Pros

• Develops good vacuum

• Good with thin liquids

• Can change displacement and angle

Cons

• Complex

• Not for thick liquids

• Contamination possible

• Hard to Clean

PERISTALTIC PUMPS

• Flow rate controlled by roller clamp

• Tube walls squeezed to form seal as roller moves along tube– More rollers

increase accuracy

http://www.animatedsoftware.com/pumpglos/peristal.htm

PERISTALTIC PUMPS (cont.)

• Positive Displacement Pump

• Used in a variety of medical applications

http://www.pump-manufacturers.com/suppliers/environmentalpumping.html

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+

http://www.uspto.gov/

Maintenance Efficiency Cost Accessibility Total

Spur Gear Pump

1 2 3 2 8

Vane Pump

1 3 1 1 6

Peristaltic Pump

3 3 2 3 11

DESIGN EVALUATION

0 – worst; 3 - best

STEPPING MOTORS

• Converts electrical energy into motion

• Characteristics:– Voltage = Torque

– Low cost ($60 & up)

– Easily programmable• C/C++ Program• Labview

http://eio.com/step-rot.html

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.

• Work on budget with client

• Buy parts to assemble pump

• Buy an economical Stepper Motor

• Learn programming

• Figure out deshielding options/nonferrous materials

FUTURE GOALS

Questions?