Rehab Engineering and Design
TrackPro: Eye-Tracking Technology to Recover Faster
Design Brief:
The focus here is on an assistive technology that is either assistive device, a therapeutic device or both that allows a person to accomplish tasks necessary for daily life at home, in the community, at school, and in the workplace.
Your design goal here is to develop an assistive technology approach to one of the cases. In this particular situation, however, you should develop one approach that would be appropriate for a resource-rich environment, and one for a resource-poor environment. To do this, you must develop a clear and incisive set of design specifications, with a clear set of priorities. When you are done, explain both how the lower-cost approach provides an acceptable level of performance and how the higher-cost approach provides some tangible return for the additional resources.
Our Case:
Case 3: Adult with TBI
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19-year-old male college student that plays D1 soccer.
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He has suffered a severe collision on the soccer field and showed symptoms of frontal lobe injury.
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MoCA: Initially scored 21/27 then > 3mo later 27/27
Patient Goals: back to current D1 team, American national team in World Cup
Clinician Goals: real-time deficit detection, improve executive function
Coach Goals: back to competitive play by next season
High Resource Environment: San Fransico, California
Low Resource Environment: Accra, Ghana
Assumptions
Soccer Assumptions
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Official FIFA/NCAA rules followed
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uniform rules, standard game schedule/ time
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Executive function is lowered over the course of the game
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Center midfielder is the playmaker
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Change directions/speed
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Think about plays
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Needs spatial awareness
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Patient Assumptions
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Very motivated → easily adopt AT
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Resting MoCA of 27/27
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Attention and executive function impairment from concussion
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High-Resource: Willing adopter of tech
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Low-Resource: Invested in by University of Accra
Concussions (Traumatic Brain Injury)
Design Opportunity and Priorities
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Symptoms can be motor, executive or cognitive
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Effects manifest differently in everyone
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Long term effects
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Higher possibility for second concussion
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Lot of unknowns due to wide variety of symptoms
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Strong correlation between eye movement, size and blink rate and concussions
Our Design
Our design is a micro camera enclosed in adhesive silicon material to resemble the under eye black paint athletes wear to block sun glare.
Layer 1
Matte Black Cover
-absorbs sun glare
Layer 2
Protective Silicon Casing
-flexible
Layer 3
Circuit Layer
-battery
-flex circuit
-micro USB charging port
-MCU, Bluetooth, real-time detection
-camera
-accelerometer
Layer 4
Sweat Proof Skin Adhesive
Our Design
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Top Layer: Matte black silicone casing- balance of flexibility and rigidity to fit the contour of the face but protect the electronics
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Middle Layer: electronics such as the IMU, MCU, battery, camera, Bluetooth module
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Send data to app to store data for data processing using BLE
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Approx. 95G concussion impact threshold
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Camera pointed upwards to track eye movement
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Push button for on/off
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3 hour battery life, Micro-USB charging
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Bottom Layer: sweat-proof skin adhesive, strong enough to hold everything in place
High-Resource
High-Resource Design
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Weighted contact lens with red dot
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Camera tracks movement of fixed red dot
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Very accurate and precise
Low-Resource
Low-Resource Design
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Camera tracks pupil movement
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Buffer area, less accurate
Feasibility
Eye Tracking & Concussions
Executive
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Ocular motility dysfunction may be present in up to 90% of TBI patients
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Gross assessment of eye movement is commonly performed by healthcare providers to assess neurological/ ophthalmic functioning
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Memory and recall tracking
Motor
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Reaction test
Sideline App exercises similar to MoCA
Eye Black & Positioning
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Reduce sun glare
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Looks “tough”/ less stigma
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Allowed in soccer games
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Placement allows camera to see pupil
Size: 0.2” (5mm) thickness
0.17” electronics
0.03” top and bottom layers
Manufacturing/ Cost
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Conductive metal ink flex circuit
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Size/ Cost of electrical components considered
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Universal design can fit many sports and faces
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Economies of scale can reduce price further
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Small and easy to distribute
Cost: $100/ pair (multi-use)
$30 for all electronics for both
$15 for flex PCB & manufacturing
$50 manufacturing > $100 MSRP
Assume some economies of scale
Paired Tablet App
Our App is focused on building a database to alert you when there are irregularities in performance and improve executive function.
My Role on the Team
My main task on this team was helping with the medical research and the feasibility research. In addition to those tasks my group met weekly and I helped lead our meetings to stay focused and driven to not only complete the project on time but have a strong presentation that had zero holes in it. I think that was the most successful part of this presentation is the consideration of each potential area of critique and made sure we had statics or potential options for their skepticism.
The Final Presentation
The final presentation was held in class with 6 guest judges that Dr. Johnson invited that worked in the medical field as either occupational therapists, designers or engineers. They were given a fake 6 million dollars to invest in a group or multiple groups any way they want.. After all the presentations our group won 70% of the funding while one other group won 30%.