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Smart Mattress

Smart Mattress Bryan Kuo, Priyen Patel, Dev Shah, Xitij Shah, Tim Stamm Georgia Institute of Technology December 5, 2008 Project Overview Goals: Prevent bedsores acquired on hospital/nursing home beds Wetness Detection Inactivity Detection Prevent incorrect medication administration

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Smart Mattress

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  1. Smart Mattress Bryan Kuo, Priyen Patel, Dev Shah, Xitij Shah, Tim Stamm Georgia Institute of Technology December 5, 2008

  2. Project Overview • Goals: • Prevent bedsores acquired on hospital/nursing home beds • Wetness Detection • Inactivity Detection • Prevent incorrect medication administration • Patient Identification System • Patient Barcode Display • Clients: • Hospitals • Nursing Homes • Cost: $1,055

  3. Design Objectives • Identify patients using RFID • Display patient information and barcode on a PC monitor • Detect moisture and patient inactivity that could cause bed sores • Alert staff if patient is in danger of developing bed sores

  4. Overall System - Current

  5. Overall System - Current

  6. Previous RFID System • Passive RFID System • OBID i-scan HF RFID Reader • OBID i-scan HF Pad Antenna • RFID Operating Frequency: 13.56 MHz • RFID Antenna Range: 7 in. • RFID Transmitting Power: 1W ± 2 dB * Note: This range did not meet our specifications

  7. Current RFID System • Active RFID System • Wavetrend RX201 Active RFID Reader • Wavetrend AN100 Active Whip Antenna • RFID Operating Frequency: 433 Mhz • RFID Antenna Range: 35 ft • RFID Wavelength: 2.3 ft • Tag Battery Life: 5 years

  8. RFID System • RFID antenna located at foot of bed • Wavetrend Active RFID tags • Patient tag compared to patient ID database • Patient name and barcode displayed on PC RFID Tag Reader and Antenna HP Slimline PC

  9. RFID Detection Range

  10. Inactivity Monitoring System

  11. Inactivity Monitoring System

  12. Wetness Detection • 2 conductive loops of tape connected to wetness detection circuit • 1st comparator input monitors moisture • 2nd comparator detects breaks in the conductive loop

  13. Wetness Detection System

  14. Phidget 8/8/8 Interface Kit • Interface between inactivity monitoring and wetness detection systems with HP Slimline PC • 4 analog inputs for FSR strips • 1 analog input for sampling wetness detection circuit output

  15. Current Status • Wetness detection system • 2 conductive loops, comparator, and 2 9V batteries • Successfully implemented and tested on breadboard • Inactivity monitoring system • 4 Trossen Robotics force sensing resistor strips • Controlled through Phidget 8/8/8 interface kit • Successfully implemented and tested • RFID System • Wavetrend Active RFID Reader/Antenna • Successfully implemented and tested

  16. Technical Specifications Proposed Actual RFID Reader RFID Operating Frequency 13.56 MHz 433 MHz RFID Transmitting Power 1W ± 2 dB N/A Max RFID Reading Distance 1 ft (12 in.)‏ 35 ft. RFID Current Draw Max. 0.5 A Multiplexer Microprocessor PIC18 LF2321 Phidget 8/8/8 Interface Kit Power Supply 3.3  V 2 9V batteries Current Consumption < 5mA Switching Loop-time 16 ms Same Trossen Robotics 24” FSR Force Sensitivity Range 0 to 1000 lbs Same Pressure Sensor Range 1.5 to 150 psi Same Design Specifications

  17. Competing Products Total Care SpO2RT Hospital Bed Secure II Med/Surg Hospital Bed $28,500 $10,000

  18. Part Quantity Unit Cost Total Cost FSR Robotics Sensor Kit 4 $27 $108 Phidget 8/8/8 1 $80 $80 Wires/Cables 1 $15 $15 9V Battery 2 $7.50 $15 RFID Tag and Reader 1 $307 $307 Conductive Tape 75ft $50 $50 Mattress Foam 1 $150 $150 Bed Sheet 1 $30 $30 HP Slimline PC 1 $250 $250 PC Monitor 1 $50 $50 Total Equipment Cost $1,055 Cost

  19. Selling Points • Lower cost • Costs $1,055 • Competitor products cost at least $10,000 • Portable • More versatile • Combines wetness and inactivity detection • Utilizes RFID to prevent improper medication administration • Appealing Graphical User Display

  20. Future Considerations • Use a smaller, cheaper microcontroller such as a PIC • Implement systems on a PCB • Find smaller wrist/ankle band active RFID tags

  21. PIC Microcontroller • Used for integrating wetness detection, inactivity monitoring, and patient identification systems into a low-cost power-efficient package • Low power operation using 3V coin cell battery • Programmed in C via 6-pin header through PICkit2 • RS232 communication to PC using onboard UART • Pushbutton and LED for debugging

  22. PIC for Inexpensive System Integration • RFID • Implement either using RS232 with current reader or SPI enabled reader • Inactivity monitoring • Sample force sensing resistors using onboard ADC • Wetness detection • Sample output of comparators using digital input • LCD for display of system status

  23. Demonstration Plan • Inactivity Detection • Group member lays for extended period of time. • LCD monitor displays inactivity alarm • Patient Identification • RFID tag located within antenna range • LCD monitor displays patient name • LCD monitor displays patient medication barcode • Wetness Detection • Salt water poured on bed • LCD monitor displays wetness alarm

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