Smart Bandage Wound Monitoring Through a Connected Smart
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 70 yr 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. • • • TI CC 2640 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 1 cm intervals inside bandage • Max current of 0. 3 m. A < 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
CC 2650 Launchpad • Code compatible with CC 2640 • Contains XDS 110 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 (u. A) CHECK_MODE 12 130, 367 TRANSMIT_MODE 10 8, 400 SLEEP_MODE 3588 2. 7 All Modes (Passive Consumption) 3600 133 Power Consumption: 0. 69 m. Ah Battery Life: 157 hours (6. 6 days) This could be optimized by introducing ultra-low power timers such as TI TPL 5110 for 33. 6% more battery life
Moisture Sensing • Goal: Detect surface moisture through resistivity • Grid of conductive material spaced at 1 cm intervals inside bandage • Max current of 0. 3 m. A < minimum threshold of sensation
Price Estimates • • Price Calculations For Smart Bandage Costs
- Slides: 20