RFID Fall Detection Floor Mat System
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RFID Fall Detection RFID Fall Detection Floor Mat SystemFloor Mat System
Andrew Heidt Andrew Heidt Brian TippinsBrian TippinsZach BrannanZach BrannanAbdirizak MireAbdirizak Mire
Coleman McDanielColeman McDaniel
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System OverviewSystem Overview
Detects patient falls using RFID wrist Detects patient falls using RFID wrist and foot tags and an antenna and foot tags and an antenna embedded in a floor matembedded in a floor mat
Provides monitoring capabilities in Provides monitoring capabilities in hospitals and elderly care facilities, hospitals and elderly care facilities, where falls are commonwhere falls are common
Costs $3065 per unitCosts $3065 per unit
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Design Objectives – Design Objectives – All MetAll Met
Reliably detect patient falls and egressReliably detect patient falls and egressTags reliably detected within 10” to 14” rangeTags reliably detected within 10” to 14” range
Notify staff at a remote monitoring Notify staff at a remote monitoring station using a network connectionstation using a network connection
Network alerts work successfullyNetwork alerts work successfully
Record incidents in logfileRecord incidents in logfileLog file correctly documents all incidentsLog file correctly documents all incidents
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Technical SpecificationsTechnical Specifications
SpecificationProposed Actual
Max. Read Range 12 to 24 in. 14.6 in.
Frequency Required 13.56 MHz +/- 7 kHz
13.56 MHz +/- 7 kHz
Reader Power Requirement
> 0.75 W 1 W
Mat Size 15 – 30 square ft. 12 square ft.
Weight < 30 lbs <15 lbs
Detection Reliability > 95% Detection Rate
> 95% Detection Rate
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System DiagramSystem Diagram
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Antenna DesignAntenna Design Single Loop Copper Single Loop Copper
foil antennafoil antenna 42 in. by 24 in.42 in. by 24 in. Matched to 50 Ω Matched to 50 Ω
readerreader
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Matching and Tuning NetworksMatching and Tuning Networks
Tuning NetworkTuning Network Output to AntennaOutput to Antenna Resistor R1Resistor R1 Variable Capacitor C4Variable Capacitor C4 JumpersJumpers Common Mode ChokeCommon Mode Choke
Matching NetworkMatching Network Input from Interface Input from Interface
BoxBox CapacitorsCapacitors Common Mode Common Mode
ChokeChoke
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Matching and Tuning NetworksMatching and Tuning Networks
Tuning NetworkTuning Network Output to AntennaOutput to Antenna Resistor R1Resistor R1 Variable Capacitor C4Variable Capacitor C4 JumpersJumpers Common Mode ChokeCommon Mode Choke
Matching NetworkMatching Network Input from Interface Input from Interface
BoxBox CapacitorsCapacitors Common Mode Common Mode
ChokeChoke
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VB – Computer ImplementationVB – Computer Implementation
• Two Software ModulesTwo Software Modules1.1. Local Monitoring UnitLocal Monitoring Unit - Communicate - Communicate
locally with reader in/near patient roomlocally with reader in/near patient room2.2. Remote Monitoring Station - Remote Monitoring Station - Provide Provide
capability to monitor multiple patients at capability to monitor multiple patients at central locationcentral location
• TCP/IP Information sent includes:TCP/IP Information sent includes: Time stampTime stamp RFID tag ID #RFID tag ID # Room #Room #
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Computer Interface: Process FlowComputer Interface: Process Flow
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Interfacing with Hospital NetworkInterfacing with Hospital Network
Local Monitoring Unit (LMU) – VB6Local 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 Transmits alerts and resolutions to
remote monitoring station (TCP/IP)remote monitoring station (TCP/IP)
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Local Monitoring Unit GUILocal Monitoring Unit GUI
Monitoring Window Connection Window
Tag Detection Window
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Interfacing With Hospital NetworkInterfacing With Hospital Network
Remote Monitoring Station (RMS) – VB8Remote Monitoring Station (RMS) – VB8• Provides patient table to aid monitoring Provides patient table to aid monitoring
multiple patientsmultiple patients• Receives AlertsReceives Alerts
Determines alert type (Fall/Egress/Unknown)Determines alert type (Fall/Egress/Unknown) Establishes relevant patient and room numberEstablishes relevant patient and room number Displays alert windowDisplays alert window Resolves remotely from LMU (TCP/IP)Resolves remotely from LMU (TCP/IP)
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Remote Monitoring Station GUIRemote Monitoring Station GUI
Patient Monitoring Table
Fall Alert
Alert Resolution
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Antenna PackagingAntenna Packaging
Antenna with anti-fatigue floor matAntenna with anti-fatigue floor mat Low profile floor mat ½” thicknessLow 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”
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Final Product PrototypeFinal Product Prototype
Matching network circuit Matching network circuit Adjustable tuningAdjustable tuning Floor mat antennaFloor mat antenna
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CostsCosts
PartsParts Expect CostsExpect Costs Actual CostsActual Costs
RFID ReaderRFID Reader $700.00$700.00 $532.00$532.00
Floor MatFloor Mat $100.00$100.00 $99.51$99.51
Copper FoilCopper Foil $10.00$10.00 $10.00$10.00
CablesCables $15.00$15.00 $40.15$40.15
CapacitorsCapacitors $10.00$10.00 $0.70$0.70
ResistorsResistors $2.00$2.00 $0.20$0.20
MultiplexerMultiplexer $50.00$50.00 $0.00$0.00
TotalTotal $887.00$887.00 $682.56$682.56
Development Costs: Production Costs:
Expected PriceExpected Price Actual PriceActual Price
Selling PriceSelling Price $3500.00$3500.00 $3065.00$3065.00
Selling Price (Based on 25% profit)
Expected CostsExpected Costs Actual CostsActual Costs
PartsParts $1000.00$1000.00 $1133.85$1133.85
Development Parts List
RFID ReaderRFID Reader $532.00$532.00
Floor MatFloor Mat $199.02$199.02
Copper FoilCopper Foil $30.00$30.00
CablesCables $118.33$118.33
CapacitorsCapacitors $2.10$2.10
ResistorsResistors $0.40$0.40
MultiplexerMultiplexer $0.00$0.00
ComputersComputers $200$200
RFID TagsRFID Tags $15.00$15.00
PackagingPackaging $37.00$37.00
TotalTotal $1133.85$1133.85
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ResultsResults Proposed Read Range = 12” – 24”Proposed Read Range = 12” – 24” Actual Read RangeActual Read Range
• Average = 11.8”Average = 11.8”• Peak = 14.6”Peak = 14.6”
Range is dependent on tag orientation and Range is dependent on tag orientation and locationlocation
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Experimental Read Range: 0Experimental Read Range: 0° Orientation° Orientation
*Units in inches
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Experimental Read Range: 45° OrientationExperimental Read Range: 45° Orientation
*Units in inches
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Experimental Read Range: -45° OrientationExperimental Read Range: -45° Orientation
*Units in inches
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Experimental Read Range: 90° OrientationExperimental Read Range: 90° Orientation
*Units in inches
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Wrist Tag OrientationWrist Tag Orientation
Due to orientation dependency, two tags Due to orientation dependency, two tags are placed on the wrist to increase read are placed on the wrist to increase read reliabilityreliability
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Future WorkFuture Work
Automatic tuning will allow one to Automatic tuning will allow one to achieve maximum read range with a achieve maximum read range with a changing environmentchanging environment
An RFID reader with a higher power An RFID reader with a higher power output or a larger antenna would output or a larger antenna would allow a decrease in wrist tag sizeallow a decrease in wrist tag size
System waterproofingSystem waterproofing Antenna embeddingAntenna embedding
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Project DemonstrationProject Demonstration
VIDEOVIDEO
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Patient falls cost the health care Patient falls cost the health care industry $19.4 billion each yearindustry $19.4 billion each year