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 University of Wisconsin M adison Biomedical Engineering Design Courses INTELLECTUAL PROPERTY STATEM ENT All information provided by individuals or Design Project Groups duringthis or subsequent presentations is the property of the University and of the researchers presentingthis information In addition any information provided herein may include results sponsored by and provided to a mem ber company of the Biomedical Engineering Student Design Consortium SDC The above information may include intellectual property rights belongingto the U niversity to whichthe SDCmayhave 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 n i formation for any other purpose unless given written approval in advance by the Project Group the Client SDC and the Advisor 3 Agrees to keep this information in confidence until the U niversity and the relevant parties listed in Part 2 above have evaluated and secured any applicable intellectual property rights in this information 4 Continued attendance at this presentation constitutes compliance with this agreement 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 www medrad com 7 min 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 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 CONS Low cost Simple Reliable Efficient 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 DESIGN EVALUATION Maintenance Efficiency Cost Accessibility Total Spur Gear 1 Pump 2 3 2 8 Vane Pump 1 3 1 1 6 Peristaltic Pump 3 3 2 3 11 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 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 Questions
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