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Published byHarjanti Irawan Modified over 5 years ago
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In-vivo Device for Measuring and Adjusting Lap-Band Pressure
©Bill Watterson John Huidekoper Mark Fritz Andrew Koivuniemi David Mayhew Chris Schroeder
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Reasons for Design Choices
Problems Device Failure Leaks (Maude Database) Patient Pain Fixes Implantable Pump Autonomous Control as well as Non-Invasive Control
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Design basics Pump to maintain, increase, or decrease pressure
Implantable To stop need for risky insertion with the pump To have a more smooth volume increase Which leads to smoother weight loss Keep it small like a pacemaker Pacemaker_GuidantMeridianSR.jpg/180px-Pacemaker_ GuidantMeridianSR.jpg
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Pump Design Connected to lap-band catheter
Fluid filled bag within pacemaker sized device Pressure sensor Rf antenna Circuitry Titanium box, encased in biocompatible material, and sutured to the abdominal wall
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AutoCAD
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Motor Control Motor is driving the pump need a control
Precise bi-directional speed control Pseudo-tachometer feedback circuit Active breaking
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Computing and Control Need a circuit to integrate the following functions Receive information from the pressure sensor Store data from pressure sensor Receive protocol from RF circuit Follow protocol Send signal to motor control circuit Run off DC power
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Electronics Schematic
RF Transceiver Microprocessor Pressure Sensor Data Storage Signal Processing Motor Control Circuit
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Solution AMIS Frequency Agile Transceiver
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Advantages Greatly simplifies circuit Easy to program and test
Designed to be in medical implants Medical Implant Communication Services (MICS) standard
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Fluid Bag Support Frame
Wire frame Flexible material Accordion folding
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Fluid Bag Support Frame
Wire frame Flexible material Accordion folding
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Grant Proposal Submitted 30 November, 2006
Current Status: Under Committee Review Expected Notification: February 2007
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