Traumatic brain injury eyewear tb eye
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Traumatic Brain Injury Eyewear “TB-Eye”. Todd Biesiadecki, Matthew Campbell, Matthew Vildzius ECE4007 L03 EM1 Advisor: Erick Maxwell December 14, 2011. Overview. Glasses to alert user of potential head injury

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Traumatic Brain Injury Eyewear “TB-Eye”

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Traumatic brain injury eyewear tb eye

Traumatic Brain Injury Eyewear “TB-Eye”

Todd Biesiadecki, Matthew Campbell, Matthew Vildzius

ECE4007 L03 EM1

Advisor: Erick Maxwell

December 14, 2011


Overview

Overview

  • Glasses to alert user of potential head injury

  • Approximately 50,000 people die and 85,000 suffer long term injuries due to Traumatic Brain Injury(TBI) per year

  • For non-contact sports such as skiing and cycling

    • Head impacts infrequent

    • specialized helmets not justified or practical

  • Unit development cost: $234


Design objectives

Design Objectives

  • Lightweight, unobtrusive device

  • Battery powered

  • Data recording and storage

  • Wireless communication

  • Alert the user to get medical attention

  • Computer based graphical interface


Design goals

Design Goals


Device mounted on a pair of sunglasses

Device mounted on a pair of sunglasses


Tb eye system level diagram

TB-Eye System-Level Diagram


Device operation

Device Operation


Physical dimensions

Physical Dimensions

  • Size:

    • Main Board: 3.4” long

    • Power Board: 1.45” long

  • Weight: 14.5 g

    • With Glasses: 46.2 g


Accelerometer

Accelerometer

  • 16G accelerometer

    • Analog Devices ADXL345

    • 145uA max. current

    • Measurements of 10G or more will trigger an alert

    • Utility of recorded data more limited vs. full range device

  • Using built-in interrupts for threshold and data ready


Microcontroller

Microcontroller

  • ATMega328 microcontroller with Arduino libraries

    • Power consumption slightly higher than competition

    • Well-supported libraries

  • Power consumption is 4mA while sampling


Bluetooth transceiver

Bluetooth Transceiver

  • Acts as a cable replacement between device and computer

  • Only sends data when requested by GUI

  • ANT wireless protocol difficult to work with, BLE not yet available

    • Increased size

    • led to delay


Microcontroller flowchart

Microcontroller Flowchart


Saving serial data

Saving Serial Data

  • Python script

    • No standalone programs available

    • Difficulties with serial functions in MATLAB

  • Read binary data from the Bluetooth serial port

  • Format data as floating points in terms of g

  • Save data to a text file to be read by MATLAB

  • Called using the “Read Data From Device” button in GUI


Graphical user interface gui

Graphical User Interface (GUI)


Integration with glasses

Integration with Glasses

  • Not allowed to modify given glasses for prototype

  • Prototype board is larger than desired

  • In production the circuit could be molded into the glasses frame


Battery life in monitoring mode

Battery Life in Monitoring Mode

  • 110mAh battery

  • Microcontroller: 4mA max

  • Accelerometer: 0.15mA

  • Max current: 4.15mA

  • Worst-case battery life: 26 hours

  • Optimization could not be completed in time for demo

  • Slight additional power reduction should be possible

  • Notification LED adds additional 2mA

  • Peak of 45mA when Bluetooth is transmitting


Acceptance testing

Acceptance Testing

  • Device placed on simulated head

  • Impact head with calibrated amount of force

    • Short impact similar to those expected to cause TBI

  • Used GUI to wirelessly receive, display data

    • Compare measured data to calibrated impact

  • Demonstrated LED turns on when threshold is exceeded


Prototype pcb problems

Prototype PCB problems

  • Problems getting microcontroller to work (power, wrong frequency, wrong way of programming bootloader)

  • Resolved with third microcontroller

  • Bluetooth must be temporarily disconnected for programming


Final budget

Final Budget

  • Total budget: $405.00

  • Total spent: $234

    • Expenditures:

      • Development: $69.85

      • Components for one board: $45.94 + PCB ($33) = $78.94

      • Unused parts: $85.21

        • Spare capacitors, resistors, etc.

        • ANT modules

        • Alternate EEPROM module

  • Oakley M-Frame MSRP: $129.00


Future work

Future Work

  • Use ±100g accelerometer for full TBI detection

  • Low cost size reduction:

    • Use 4 or more layer board technology

    • Thinner PCB

    • Use 0402 and resistors and capacitors, QFN MCU

    • Eliminate headers, use smaller headers

  • High cost: Custom integrated circuits

  • Better integration with glasses frame

  • Method to more securely attach to the head

  • Smartphone application


Questions

Questions?


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