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
Motivation
Why does the world need a Smart Bandage?
Motivation: Diabetics
• 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
Warning: Graphic Image
10 Year Open Wound on 70yr old
Motivation: Burn Wounds
• Excessive inflammation
• Uncontrolled bacterial
growth
• Australia now sending
patients with 40% burn
body coverage home
• Difficulty in training
parents/family for wound
care
Warning: Graphic Image
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
Solution Design
Goal: A small, embedded solution for wound monitoring with useful sensors
and Android and Web applications targeted at Doctors and Nurses.
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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
System Architecture
Direction of Data Flow
Components
• Communications Module
• Reusable enclosed module
• Bandage Module
• FPC Sewn into bandage
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
Bandage Module Hardware
Temperautre +
Humidity Sensor
Bottom
Top
(Unpopulated)
Top
Temperature Sensors
Moisture Sensing
Contacts + Sew Holes
Flexible Printed Circuit (FPC) to be sewn into a bandage
Demonstration
Wound monitoring through a connected Smart Bandage
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
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
Thanks for Watching!
Wound Monitoring Through a Connected Smart Bandage
Full Schematic
CC2650 Launchpad
• Code compatible with CC2640
• Contains XDS110 Debugger
• Can program standalone devices
State Diagram for MCU
• States:
Sleep, Check, Transmit, Initialize,
Temporary Error, Permanent Error
• Events:
• Check Timer Expires, BLE Timer
Expires, Data Change, No Bandage
Detected
Power Calculations
State
Seconds/Hour (S)
Current Draw (uA)
CHECK_MODE
12
130,367
TRANSMIT_MODE
10
8,400
SLEEP_MODE
3588
2.7
All Modes (Passive Consumption)
3600
133
Power Consumption:
0.69mAh
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
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
Price Estimates
• Approximate cost for 2 year
homecare without the Smart
bandage 1000 365 2 =
$𝟕𝟑𝟎, 𝟎𝟎𝟎
• Approximate cost for 2 year
period with smart bandage
1000 + 6.2 365 =
$𝟑𝟔𝟕, 𝟐𝟖𝟐. 𝟔𝟐
• Overall Savings 730000 −
3672.62 = $𝟑𝟔𝟐, 𝟕𝟏𝟕. 𝟑𝟖
• Price Calculations For Smart
Bandage Costs
~ Unit pricing for batch of 10,000 smart bandages
Communications Module
Bandage Module
Assembly
$4.00
$1.00
Components
$8.62
$5.20
Casing
$5.00
Battery
$2.00
Total
$19.62
$6.20