1. Smart Bandage Wound Monitoring Through a Connected Smart Bandage
Mike Blouin – Hardware & Embedded
Jenna Hatchard – Embedded & Android
Jared Cuglietta – Android & Web
ECE 492 Group 1 – Winter 2016

2. Motivation
Why does the world need a Smart Bandage?

3. Motivation: Diabetics
Warning: Graphic Image
Problems with Diabetes:
Neuropathy (decreased/lost sensation)
Decreased blood flow in legs
Worldwide epidemic
Wounds may not be noticed quickly
Very hard to heal
Often leads to amputation
45% 5 year survival rate for diabetics with amputated legs
10 Year Open Wound on 70yr old

4. Motivation: Burn Wounds
Warning: Graphic Image
Excessive inflammation
Uncontrolled bacterial growth
Australia now sending patients with 40% burn body coverage home
Difficulty in training parents/family for wound care
Police Officer in Helicopter crash. 65% burn coverage
Complete re-epithelialization in 29 days

5. $25-30 Why a Smart Bandage: In-home care by a Nurse costs $1000/day
Remote monitoring of wounds by professionals/specialists
Reach developing countries
Reduce load on hospitals
Reduce healing time
Detect infection as it happens
$25-30
Projected cost of Smart Bandage

6. Solution Design
Goal: A small, embedded solution for wound monitoring with useful sensors and Android and Web applications targeted at Doctors and Nurses.
TI CC2640 Bluetooth Microcontroller
Integrated battery management, lasting >= 1 week
Temperature, humidity, and surface moisture sensing
Software recognition of “interesting” data points
Android application for reading information from device and relaying data
Web application for remote monitoring of patient information

7. System Architecture
Direction of Data Flow

8. Components Communications Module Bandage Module
Reusable enclosed module
Bandage Module
FPC Sewn into bandage

9. Communications Module Hardware
4-Layer Printed Circuit Board
Two boards: Top and Bottom
Double-sided SMD placement issues
Detachable debug/programming board
PCB trace antenna for small form-factor/weight
Li-Ion Battery chargeable via µUSB
Battery image source:
Battery Dimensions: 5.7x12x28mm
Stats:
32 Packages
83 SMDs
8 fine pitch
Presentation Order
Debug Board
JTAG Debug header
Debug temperature/humidity sensors
Debug LEDs and inputs with IO Expander
Top Board
CC2640 MCU
PCB Trace Antenna
Moisture sensing circuitry
Bottom Board
Li-Ion MGMT Circuitry: Charge manager and battery gas gauge
3.3V Power regulation and shutoff circuitry

10. Bandage Module Hardware
Temperature Sensors
Temperautre +
Humidity Sensor
Moisture Sensing
Contacts + Sew Holes
Top
Top (Unpopulated)
Bottom
Flexible Printed Circuit (FPC) to be sewn into a bandage

11. Demonstration
Wound monitoring through a connected Smart Bandage

12. Moisture Detection Goal: Detect surface moisture through resistivity
Grid of conductive material spaced at 1cm intervals inside bandage
Max current of 0.3mA < minimum threshold of sensation

13. Next Steps Wireless Inductive charging
Allows for better seal on casing, less intrusive charging
Antenna strength and interference
Increased battery life (+30%)
Intelligent web/Android alerts
More intensive calibration of moisture detection circuitry

14. Questions?
Wound Monitoring Through a Connected Smart Bandage

15. Full Schematic

16. CC2650 Launchpad Code compatible with CC2640 Contains XDS110 Debugger
Can program standalone devices

17. State Diagram for MCU States: Events:
Sleep, Check, Transmit, Initialize, Temporary Error, Permanent Error
Events:
Check Timer Expires, BLE Timer Expires, Data Change, No Bandage Detected

18. Power Calculations State Seconds/Hour (S) Current Draw (uA) CHECK_MODE12
130,367
TRANSMIT_MODE 10
8,400
SLEEP_MODE
3588
2.7
All Modes (Passive Consumption)
3600
133
Power Consumption: mAh
Battery Life: 157 hours (6.6 days)
This could be optimized by introducing ultra-low power timers such as TI TPL5110 for 33.6% more battery life
Would reduce the all mode passive consumption + SLEEP_MODE to ~40nA.

19. Moisture Sensing Goal: Detect surface moisture through resistivity
Grid of conductive material spaced at 1cm intervals inside bandage
Max current of 0.3mA < minimum threshold of sensation

20. Price Estimates
Approximate cost for 2 year homecare without the Smart bandage = $𝟕𝟑𝟎,𝟎𝟎𝟎
Approximate cost for 2 year period with smart bandage = $𝟑𝟔𝟕,𝟐𝟖𝟐.𝟔𝟐
Overall Savings − =$𝟑𝟔𝟐,𝟕𝟏𝟕.𝟑𝟖
Price Calculations For Smart Bandage Costs