Magnetic Resonance Imaging Compatible Infusion Pump 
 

Team Members:  
1.  Amanindera Ghotra—Team Leader

     Email: asghotra@wisc.edu

2.  Can Pi—Communicator

     Email: cpi@wisc.edu

3.  Prakash Rao—BWIG

     Email: prao@wisc.edu

4.  Miguel Benson—BSAC

     Email: miguelbenson@wisc.edu 
 

Advisor:

John G. Webster

UW Dept. of Biomedical Engineering

Phone: (608) 263-1574 or (608) 263-4660  
Email: webster@engr.wisc.edu 
 

Client:

George C. Newman, M.D., PhD 
UW Dept. of Neurology 
Phone: (608) 263-9800 
Email: newman@neurology.wisc.edu

Date: 4-21-04 thru 4-27-04 
 
Problem Statement:  MRI compatible infusion pump for gadolinium and saline solutions has pumps that are syringe driven but limited in their sequence capability and in the amount each can hold. The client wants two new pumps that are programmable and can effectively control the infusion rates of gadolinium and saline independently without having to refill the syringes.  New pumps will not only save client’s time, but it will also save money since refilling the syringes wastes a lot of gadolinium. 

Restatement of Team Goals from Last Week:

1. Order all the parts (ratchet, pawl, gear mechanism, solenoid coil and solenoid valve.
2. Begin working on our final semester PowerPoint. 
3. Make a schematic sketch of our current design and the alternate design.
4. Calculate approximate flow rates, torque and horsepower for our prototype using the equations Dr. Fronczak has given us. 

Summary of Accomplishments: 

1.  We have ordered all the parts and received the ratchet and the pawl, but we are still waiting for the actuator, solenoid valve and plate, and a plate that attaches the solenoid and the gear mechanism.  After talking to several companies, we found that a linear actuator as our gear mechanism would work the best.  It is like a worm gear.  It moves the pawl, to which is attached horizontally, turning the ratchet, therefore, driving the peristaltic pump.     

After talking to many companies, including Clark and Peter Paul, we ordered our parts from a small store in Madison that is affiliated with SMTP Co.  Our original idea of using a 3-way solenoid valve has changed.  Instead, we are using a 5-way solenoid valve that a sales rep. suggested on using for our prototype, because we were not able to get an actuator that was compatible with the 3-way solenoid. 

All the remaining parts (actuator, solenoid and a plate) will be here by Wednesday.  This means we only have Thursday to work on our prototype.  Since we don’t have to make a lot of connections, we don’t expect putting together our prototype will take a long time or at least that is what we are hoping.     

Aman will go buy small parts (screws, nuts and rod) from a Hardware store.  This way, we will only concentrate on putting together our prototype on Thursday. 

2. Aman started the PowerPoint and did the introductory slides.  Prakash is putting the finishing touches on the entire presentation.  We hope to have the powerpoint done by Wednesday. 

3.  Miguel and Can met last week to sketch a schematic drawing of our prototype.  We still need to modify it, because we added new components into our planned prototype.  We have to redraw the solenoid (5-way instead of 3-way).  We hope to have the drawing done by this evening when we meet as a group. 

4.  Aman has started calculating the flow rate using our prototype.  It turns out that roughly with every one revolution, our peristaltic pump will deliver 1.5 ml/sec.  This is sufficient for our design problem which requires flow rates between (0.5-4 ml/sec).    We still have to calculate the torque.  This can be only done when we get the solenoid and the actuator.  And we have to admit, we haven’t had a lot of time to do the calculations yet and need to spend more time on them.      

Individual Goals: 

1.  Aman Ghotra: Finish Progress Report 13; Group meeting; finish putting the prototype together. 

2.  Can Pi: Group meeting; Modify Miguel’s drawing; Sketch future design(s)

3. Prakash Rao: Group meeting; Update the website; Put the PowerPoint together    

4. Miguel Benson: Finish putting the prototype together; Group meeting    
 

Statement of Team Goals:

1. Finish the prototype.  Test it before presenting it on Friday. 
2. Finish doing the calculations. 
3. Start working on the final paper after the presentation on Friday.
4. Have our website updated by next Wednesday.
5. Have the group evaluations done by Wednesday.
6. Finish or polish up our design notebooks before next week. 
7. Meet Dr. Newman sometime early next week to show him our prototype.  

Rough Project Schedule:

1/23/04: Made teams and assigned roles

1/29/04: Meet our client

1/30/04: Develop PDS

2/13/04: Brainstorm possible designs

2/24/04: Sketch out the three designs 

2/27/04: Evaluate Ideas and work on power point

3/05/04: Mid-Semester Presentation

3/05/04: Choose final design

3/05/04 – 4/23/04: Work on final design

4/23/04: Work on final power point, final paper and PDS

4/30/04: Poster Presentation 
 
Difficulties: We wish we had more time.     
 

Activities:

Aman Ghotra: Progress Report 12; Group meetings; contacted companies; ordered ratchet and pawl; PowerPoint (16.0)

Can Pi: Group meetings; Research; Drawings (15.0 hour)

Prakash Rao: Group meetings; Research; Finishing the PowerPoint (16.0 hours)

Miguel Benson: Research; Group meetings; BSAC meeting; ordered the parts (16.0 hours)  
 

Running Total: 198.0 Hours

Aman Ghotra: 75.0 hours

Can Pi: 63.0 hours

Prakash Rao: 66.0 hours

Miguel Benson: 57.0 hours