RFID Fall Detection Floor Mat System Andrew Heidt Brian Tippins Zach Brannan Abdirizak Mire Coleman McDaniel

System Overview Detects patient falls using RFID wrist and foot tags and an antenna embedded in a floor mat Detects patient falls using RFID wrist and foot tags and an antenna embedded in a floor mat Provides monitoring capabilities in hospitals and elderly care facilities, where falls are common Provides monitoring capabilities in hospitals and elderly care facilities, where falls are common Costs $3065 per unit Costs $3065 per unit

Design Objectives – All Met Reliably detect patient falls and egress Reliably detect patient falls and egress Tags reliably detected within 10” to 14” range Notify staff at a remote monitoring station using a network connection Notify staff at a remote monitoring station using a network connection Network alerts work successfully Record incidents in logfile Record incidents in logfile Log file correctly documents all incidents

Technical Specifications Specification ProposedActual Max. Read Range12 to 24 in.14.6 in. Frequency Required13.56 MHz +/- 7 kHz Reader Power Requirement > 0.75 W1 W Mat Size15 – 30 square ft.12 square ft. Weight< 30 lbs<15 lbs Detection Reliability> 95% Detection Rate

System Diagram

Antenna Design Single Loop Copper foil antenna Single Loop Copper foil antenna 42 in. by 24 in. 42 in. by 24 in. Matched to 50 Ω reader Matched to 50 Ω reader

Matching and Tuning Networks Tuning Network Tuning Network Output to Antenna Output to Antenna Resistor R1 Resistor R1 Variable Capacitor C4 Variable Capacitor C4 Jumpers Jumpers Common Mode Choke Common Mode Choke Matching Network Matching Network Input from Interface Box Input from Interface Box Capacitors Capacitors Common Mode Choke Common Mode Choke

Matching and Tuning Networks Tuning Network Tuning Network Output to Antenna Output to Antenna Resistor R1 Resistor R1 Variable Capacitor C4 Variable Capacitor C4 Jumpers Jumpers Common Mode Choke Common Mode Choke Matching Network Matching Network Input from Interface Box Input from Interface Box Capacitors Capacitors Common Mode Choke Common Mode Choke

VB – Computer Implementation Two Software ModulesTwo Software Modules 1. Local Monitoring Unit - Communicate locally with reader in/near patient room 2. Remote Monitoring Station - Provide capability to monitor multiple patients at central location TCP/IP Information sent includes:TCP/IP Information sent includes: Time stamp Time stamp RFID tag ID # RFID tag ID # Room # Room #

Computer Interface: Process Flow

Interfacing with Hospital Network Local Monitoring Unit (LMU) – VB6 Local Monitoring Unit (LMU) – VB6 Interfaces with RFID reader (Serial)Interfaces with RFID reader (Serial) Logs incidents to local text fileLogs incidents to local text file Displays tag detection alertsDisplays tag detection alerts Transmits alerts and resolutions to remote monitoring station (TCP/IP)Transmits alerts and resolutions to remote monitoring station (TCP/IP)

Local Monitoring Unit GUI Monitoring WindowConnection Window Tag Detection Window

Interfacing With Hospital Network Remote Monitoring Station (RMS) – VB8 Remote Monitoring Station (RMS) – VB8 Provides patient table to aid monitoring multiple patientsProvides patient table to aid monitoring multiple patients Receives AlertsReceives Alerts Determines alert type (Fall/Egress/Unknown) Determines alert type (Fall/Egress/Unknown) Establishes relevant patient and room number Establishes relevant patient and room number Displays alert window Displays alert window Resolves remotely from LMU (TCP/IP) Resolves remotely from LMU (TCP/IP)

Remote Monitoring Station GUI Patient Monitoring Table Fall Alert Alert Resolution

Antenna Packaging Antenna with anti-fatigue floor mat Antenna with anti-fatigue floor mat Low profile floor mat ½” thickness Low profile floor mat ½” thickness Antenna size 30” x 48” Antenna size 30” x 48” Floor mat size 36” x 48” x ½” Floor mat size 36” x 48” x ½”

Final Product Prototype Matching network circuit Matching network circuit Adjustable tuning Adjustable tuning Floor mat antenna Floor mat antenna

CostsParts Expect Costs Actual Costs RFID Reader $700.00$ Floor Mat $100.00$99.51 Copper Foil $10.00$10.00 Cables$15.00$40.15 Capacitors$10.00$0.70 Resistors$2.00$0.20 Multiplexer$50.00$0.00 Total$887.00$ Development Costs: Production Costs: Expected Price Actual Price Selling Price $ $ Selling Price (Based on 25% profit) Expected Costs Actual Costs Parts$ $ Development Parts List RFID Reader $ Floor Mat $ Copper Foil $30.00 Cables$ Capacitors$2.10 Resistors$0.40 Multiplexer$0.00 Computers$200 RFID Tags $15.00 Packaging$37.00 Total$

Results Proposed Read Range = 12” – 24” Proposed Read Range = 12” – 24” Actual Read Range Actual Read Range Average = 11.8”Average = 11.8” Peak = 14.6”Peak = 14.6” Range is dependent on tag orientation and location Range is dependent on tag orientation and location

Experimental Read Range: 0° Orientation *Units in inches

Experimental Read Range: 45° Orientation *Units in inches

Experimental Read Range: -45° Orientation *Units in inches

Experimental Read Range: 90° Orientation *Units in inches

Wrist Tag Orientation Due to orientation dependency, two tags are placed on the wrist to increase read reliability Due to orientation dependency, two tags are placed on the wrist to increase read reliability

Future Work Automatic tuning will allow one to achieve maximum read range with a changing environment Automatic tuning will allow one to achieve maximum read range with a changing environment An RFID reader with a higher power output or a larger antenna would allow a decrease in wrist tag size An RFID reader with a higher power output or a larger antenna would allow a decrease in wrist tag size System waterproofing System waterproofing Antenna embedding Antenna embedding

Project Demonstration VIDEO VIDEO

Patient falls cost the health care industry $19.4 billion each year