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Biofeedback Systemfor Propulsion Training
February 22, 2007
Group Members:Noah Reding
Nick Chadwick
Tom Soike
Project Sponsor: Dr. Mark Richter, MAX Mobility
Faculty Advisor: Dr. Paul King, Vanderbilt University
MAX Mobility Lab
• Operating Treadmill with possible incline
• Multiple PCs for data collection
• Radio transmitters for communication
Lab Safety Precautions
• Rising elevator for patients’ use
• Safety harness attached to chair on treadmill
• Discomfort scale for patients
• Emergency stop button for treadmill
Problem of Interest
Currently, there are over 2.5 million1 Americans who are confined to wheelchairs. Some users propel themselves improperly, leading to damage of their upper extremities later in life.
Project Goal
Develop software that works with an established propulsiometer to effectively “teach” new and existing wheelchair users proper propulsion methods, in hopes of reducing their chances of developing injuries of the upper extremities later on.
People Affected
• Approx. 65% wheelchair users experience upper extremity pain or injury2
• Research has linked a relationship between impact stresses placed upon the wrist, elbow, and shoulder during propulsion to upper extremity injury2
Market Analysis
• Currently, the personal mobility device industry is a $2-3 Billion operation3
• Constructive surgeries for extremities start at $10,000 and can greatly increase
• US demand for mobility devices and wheelchairs is projected to increase 6.9% annually and is expected to reach $7.4 Billion by 20124
• Our primary targets are physical therapist treating handicapped individuals, In the US alone there are more than 77,000 practicing physical therapists5
Population Change
050
100150200250300350400450
1970 1980 1990 2000 2010 2020
Year
Perc
en
tag
e C
han
ge
Wheelchair Users
US population
Performance Criteria
• To improve a pre-existing device for the capturing of real-time propulsion data
• Relay this data to a user-friendly interface, allowing for instantaneous alterations of one’s push tendencies.
• Data to be collected and analyzed:– Push frequency– Push angle– Peak force– Tangential force– Peak loading rate
Existing Solutions
Smart Wheel from 3RiversMeasures:1. Average force of push2. Length of push 3. Smoothness of push4. Push frequency
Disadvantages:1. Only fits one size of wheel2. No real-time data relay3. Costs $22,500
Our Primary Objective
• Collect and analyze data in real-time
• Fits any size wheel
• Develop a program in LabVIEW that can collect and analyze real-time data from the device.
• The data will be compared to the proper propulsion technique determined from research companies in the future.
Hardware Work
• Mini-Dat Computer collects all data with load cells
• Radio transmitter sends data to PC
• Frame with hardware fits on all-size wheels
• Connected new angle sensor to existing hardware for data collection
Solution Description 7 Different Channels of Data
Separate Into Each Channel
Gather Offset Data for Each
Subtract Offset From Each
Perform Calculations
Obtain 5 Variables of Choice
Further Breakdown of Solution
• Offset Removal– Apply to each channel– Coincide with each angle
• Filtering of Data– If needed
• Calibration Matrix– Comes from manufacturer– Scales data
Factors Involved
1. New angle sensor• More sensitive measurements ($40)
2. Simplify software so that only one
application is needed• Enables faster data collection and calculation• Matlab and LabVIEW combined into one ($0)
3. Providing data to the user in an interface• Currently in developed stages
Performance Metrics
• Perform all calculations in < 1 sec.
• Sampling rate of 200 Hz
• Relay information through user-friendly interface
• Improving Cost/Benefit – New device will be cheaper than existing
technology ($22,500 vs. $12,000) and provide real time measurement
System and Environment
Wheelchair User Propels
Data collectedSent to computer
Programs analyze and Interpret data
LabVIEW program(s)
Data read by user;Improves method
Data sent to user interface
Project Flow Chart
Learn to use Programs
Collect Sample Data
Interpret Sample Data
Assess Problems / Concerns
Redesign Programs
Interpret Real Time Data
Assess Progress / Direction For Interface
Meet with Advisor / Discuss Direction and Programs
Divide Programs Among Members
Collect Real Time Data
Completed WorkCurrent Work Future Work
References
1. http://www.wsana.org/id115.html2. http://www.thewheelchairsite.com3. http://www.beneficialdesigns.com/BD/4. http://www.pages.drexel.edu/~garfinkm/
Scale.Mkt.html5. http://www.wheelchairfoundation.org/6. http://www.3rivers.com/swhome.php7. http://www.marketresearch.com/product/
display.asp?productid=1352736&xs=r&SID=55812406-375239627-353243901&curr=USD
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