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 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

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

$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

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

System Architecture Direction of Data Flow

Components Communications Module Bandage 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 Battery image source: https://www.sparkfun.com/products/13112 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

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

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

Questions? 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: Events: 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 Would reduce the all mode passive consumption + SLEEP_MODE to ~40nA.

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