Transcript Fingerswitch for Bipolar Forceps

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
- Accurate
- Minimally invasive

Disadvantages
- Measures chest
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
- Small
- Minimally invasive
- Simple analog
voltage divider output

Disadvantages
- Expensive
- Requires proper
placement based on
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