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Fingerswitch for Bipolar Forceps (PowerPoint)

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					Portable Patient Training
Device for Lung Cancer
       Treatment

         Thomas Chia
        Jason Ethington
         Brent Geiger
          Kawai Chan

       Client: Bhudatt Paliwal, PhD
      Advisor: Willis Tompkins, PhD
         Problem Statement
 Lung cancer radiation treatments require
  stable patient breathing
 A repeatable breathing trainer is desired
 Device to be used at home and be
  portable
 Display patient’s real-time breathing
  pattern and guiding cycles
               Tomotherapy
 Radiation Treatment for Cancer
 3-D Imaging of Target Tissue
 Helical Delivery Pattern
 Intensity Modulation
      Radiotherapy (IMRT)
       -Multileaf Collimator (MLC)
 Radiation Concentrates on
      Moving Target Tissue
  Monitoring Breathing Pattern
Current Devices Used During Procedure
 Infrared Sensor and Reflector
 Laser and Laser Sensor
 Spirometer
 Patient Must Breathe with a Repeatable
  Pattern
     Design Motivations and
           Restraints
 Patient Needs to Practice Steady
  Repeatable Breathing
 Show Patient’s Breathing Pattern and
  Guiding cycle
 Small and Portable
 User Friendly
            Design Alternatives
   Breathing Pattern Measurement Hardware
       -Thermistor, Inductance Pneumography, or Linear
       Potentiometer
   Data/Signal Processing
       - Visual Basic vs. Labview
   User Interface and Display
       - Laptop vs. PDA
     Thermistor Based Breathing
               Sensor
   Use Nasal Thermistor
    or Thermocouple to
    detect airflow
   Thermistor output to
    microcontroller for
    processing
   Wireless RF to PC for
    long term Data
    Acquisition

                            Javanov et al.
      Inductance Pneumography
   Measure changes in
    respiratory volume
    through changes in
    inductance
   Small inductor wire
    attached across chest
   Measured change in
    inductance
    corresponds to
    amplitude of breath
      Inductance Pneumography
   Advantages                Disadvantages
    - Accurate                 - Measures chest
    - Minimally invasive       movement
                               - Prone to motion and
                               ECG artifact
                               - Requires proper lead
                               placement
                               - Complex
          Linear Displacement
             Potentiometer
   Miniature linear
    displacement
    potentiometer
   Cable extension
    converted to analog
    voltage
   Analog signal
    processing and real
    time display
           Linear Displacement
              Potentiometer
   Advantages                  Disadvantages
    - Small                      - Expensive
    - Minimally invasive         - Requires proper
    - Simple analog              placement based on
    voltage divider output       breathing habits
                                 (i.e. stomach vs. chest)
                Design Matrix




Ranking on a 1- 5 scale (5 is best)
     Data and Signal Processing
   Data Processing
      - Visual Basic versus LabView program
      - LabView is a program designed
        specially for real-time data acquisition
      - Less complicated than Visual Basic
      - Able to develop stand-alone programs
      User Interface and Display
   Laptop versus PDA / Pocket PC
       - Most A/D converters are compatible
             with laptop.
       - LabView program works on Laptop.
Proposed Solution
            Proposed Solution
   High Cost
     Potentiometer - $200
     PDA or video goggle - $300+
     A/D Converter - $100

 Piecing together hardware is straightforward
 Software programming will be difficult
                 Future Work
   Build potentiometer into small box
   Construct attachment strap
   Interface analog output with Labview
   Design Labview program to recognize and
    display analog signal
   Display breathing cycle waveform in real-time on
    laptop
   Scale entire design to PDA
   Disclose for patent
Special Thanks

Prof. Willis Tompkins
Bhudatt Paliwal, PhD.
    Tiezhi Zhang
 Prof. John Webster
    Burke O’Neal
    Paul Victorey

				
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posted:10/2/2011
language:English
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