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MRI INFUSION PUMP

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. OUTLINE. Problem Statement Client’s Requirements Designs 1-3 Spur Gear Vane Pump

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MRI INFUSION PUMP

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  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.

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

  3. 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) www.medrad.com

  4. 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)

  5. 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

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

  7. VANE PUMP http://www.animatedsoftware.com

  8. VANE PUMP (cont.) • Cost • Varies greatly • $174 - $2993 • Parts • Rotor • Vane plates • Casing http://www.animatedsoftware.com/

  9. 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

  10. 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

  11. PERISTALTIC PUMPS (cont.) • Positive Displacement Pump • Used in a variety of medical applications http://www.pump-manufacturers.com/suppliers/environmentalpumping.html

  12. 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/

  13. DESIGN EVALUATION 0 – worst; 3 - best

  14. 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

  15. 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.

  16. 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

  17. Questions?

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