In-vivo Device for Measuring and Adjusting Lap-Band Pressure

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Presentation transcript:

In-vivo Device for Measuring and Adjusting Lap-Band Pressure ©Bill Watterson John Huidekoper Mark Fritz Andrew Koivuniemi David Mayhew Chris Schroeder

Reasons for Design Choices Problems Device Failure Leaks (Maude Database) Patient Pain Fixes Implantable Pump Autonomous Control as well as Non-Invasive Control

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 http://upload.wikimedia.org/wikipedia/commons/thumb/b/b1/ Pacemaker_GuidantMeridianSR.jpg/180px-Pacemaker_ GuidantMeridianSR.jpg

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

AutoCAD

Motor Control Motor is driving the pump need a control Precise bi-directional speed control Pseudo-tachometer feedback circuit Active breaking

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

Electronics Schematic RF Transceiver Microprocessor Pressure Sensor Data Storage Signal Processing Motor Control Circuit

Solution AMIS-53000 Frequency Agile Transceiver

Advantages Greatly simplifies circuit Easy to program and test Designed to be in medical implants Medical Implant Communication Services (MICS) standard

Fluid Bag Support Frame Wire frame Flexible material Accordion folding

Fluid Bag Support Frame Wire frame Flexible material Accordion folding

Grant Proposal Submitted 30 November, 2006 Current Status: Under Committee Review Expected Notification: February 2007

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