RFID Fall Detection Floor Mat System

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

2. System Overview • Detects patient falls using an RFID wrist tag and an antenna embedded in a floor mat • Is used in hospitals and elderly care facilities, where falls are common • Will cost $3,500 per unit

3. Design Objectives Detect patient falls and egress < 5% detection failures Notify staff of incidents Record incidents in logfile

4. System Diagram

5. RFID Reader • Feig OBID i-Scan MR101-A • Operating Frequency: 13.56 MHz • Power Output: 1 Watt • Output Impedance: 50 ohms

6. Floor Mat • Built with hard tapered edges • Contains antenna structure • Placed at patient bedside 48” 3” 30”

7. Antenna • Copper foil antenna • Resonant at 13.56MHz • Matched to 50 ohm reader

8. Antenna Design Options • Option 1: Single-loop antenna approximately the area of the floor mat • Option 2: Two antennas multiplexed Single-loop Multiplexed

9. Impedance Simulations (HFSS) Comparing Single-loop and Multiplexed designs Single-loop Multiplexed L= Z/(jω)=1.81 μH L= Z/(jω)=1.26 μH

10. Magnetic Field Simulations (HFSS) Comparing Single-loop and Multiplexed Designs Multiplexed Single-loop

11. Summary of Antenna Design Options

12. Computer Interface: Process Flow

13. Interfacing with Hospital Network • Patient PC • Logs incidents • Displays fall alerts • Transmits alerts to nurse station • Nurse Station • Displays fall alerts • Adds/Removes patient information

14. VB – Computer Implementation Patient PC functions: • Listener() – listens on serial port for tag detections • File_Logger() – logs detection incident with date/time in local file • Transmit() – forwards detection incidents and listen resets to the nurse station • Alert() – displays alert window on PC

15. VB – Computer Implementation • Nurse Station • Add(), Remove() – add and remove patients from the monitoring system • Edit() – edit patient information (name, room number, tag number etc.) • Ignore() – stops alerts for a specific patient • Alert() – displays alert window with incident and patient information

16. GUIs • Nurse Station • Patient PC

17. Costs Expected Costs: Updated Costs: * - We no longer anticipate the use of a multiplexer in the design ** - Estimated Cost

18. Timeline

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