Title: RFID Pressure Sensor System for Hospital Mattresses to Prevent Infections and Bedsores
1RFID Pressure Sensor System for Hospital
Mattresses to Prevent Infections and Bedsores
- Bikram Virk
- Sujoy Sanyal
- Ryan Eiswerth
- Wasif Khawaja
- Mushfiq Saleheen
Dr. Koblasz, ECE4884 L05 April 22, 2008
2OVERVIEW
Develop an inexpensive hospital bed mattress that
can reduce the risk of bedsores and spread of
Nosocomial infections. Cost of prototype
1,290 (1,300 less than
predicted)
3Bedsores
Life-Threatening
- Definition
- Unrelieved pressure to part of
body - for extended period of time,
cutting - off oxygen and blood flow
- Statistics
- - 60,000 deaths/years in America
- - 1 million patients/year in
America - - 2/3 of bedsores occur in people
- over 70 years old
- Costs over 1 billion/year
4Nosocomial Infections
- Life-Threatening - All Hospitalized
Patients at Risk - Definition
- Hospital-Acquired Infections caused by
bacteria, - viruses, etc. Includes Staph
Infections - Statistics
- - more than 2 million cases/year
in America - - 17,500 70,000 deaths/year in
America - Causes
- - Sloppy hygiene 36 preventable (CDC
report) - - Aging hospitals old mattresses
- Costs - 4.5 - 5.7 billion/year
5Main Components of Project
6 7Movement Monitoring System
Trossen Robotics 24 Force Sensing Resistor
Interface Kit 8/8/8
Voltage Divider
8WARNING PLEASE MOVE
TIMER 30 Min
9WARNING EGRESS DETECTED
10RFID
- Monitor patient contact
- System
-
-
- - Operating Frequency 13.56MHz
- - Target Range 24 with 1 Watt reader
- - Tags worn on wrist
11RFID System
12Identification Process
13WARNING DR. SMITH PLEASE
STAND BACK
14Multiplexer Design
Relays
Antennas
15Competing Products
Total Care SpO2RT Hospital Bed
28,500
Secure II Med/Surg Hospital Bed 10,000
16Product Quantity Unit Price Price
Movement Detection System Trossen Robotics 24 FSR 4 24 80
Movement Detection System HP Pavillion Slimline s7700e PC 1 400 400
Movement Detection System Cables 1 10 10
RFID System TI-FEIG RFID Reader 10 1 350 350
RFID System Copper Plating 25 ft. 20 100
RFID System Antenna Board 1 pair 100 100
RFID System PIC Kit II Microprocessor 1 250 250
Total Equipment Cost Total Equipment Cost Total Equipment Cost 1,290
17Selling Point
- No need to buy new beds
- Installed as add-on to existing beds
- Money saved
18Current Status
Specification Proposed Actual
RFID Reader
- Operating Frequency 13.56 MHz 13.56 MHz
- Current Draw Max. 0.5 A Max. 0.5 A
- Detectable Range 2 ft (24 in.) 1.5-1.75 ft. (18-21 in.)
Multiplexer
- Power Supply Not Proposed 3.3 V
Trossen Robotics 24 FSR
Force Sensitivity Range lt100 g to gt 10 kg lt100 g to gt 10 kg
Pressure Sensor Range lt 1.5 psi to gt 150 psi lt 1.5 psi to gt 150 psi
Sensitivity to Vibration Not Significantly Affected Not Significantly Affected
Allowed Patient Rest Time 30 minutes 10 seconds
Senor Time Monitoring Every minute Every second
19Obstacle Proximity to Metal
20Alternative Solutions
- Dynasys 13.56 MHz Antenna
- 2 foot range
- De-Q feature
- 400
21For Future Groups
- Buy Professionally
- made antennas
- Bedside Falls
22For More Information Visit Us At
www.ece.gatech.edu/academic/courses/ece4007/08spri
ng/ece4007l05/ak11
23RFID Pressure Sensor System for Hospital
Mattresses to Prevent Infections and Bedsores
- Bikram Virk
- Sujoy Sanyal
- Ryan Eiswerth
- Wasif Khawaja
- Mushfiq Saleheen
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26Proximity to Metals
- Difficult to find Matching Network
27- Nearby PC monitors
- PROXIMITY WITH METALS Altered performance of the
RFID system can be expected when metals are in
close proximity of the radiation field. Proximity
to metals effectively lowers the antenna's
inductance. Lower inductance causes an increase
in resonant frequency and also a reduction in
"Q". Designers may consider starting with a
higher-than-needed "Q" "in the lab" to start
with, expecting it to be lowered when it is
installed in its intended location. External
capacitance may be required to tune the modified
antenna system back to resonance. These types of
situations can be experienced around conveyor
belt structures and also embedding antenna loops
on concrete driveways where metal re-bar absorbs
some of the radiated energy. - http//rfidusa.com/superstore/product_info.php?pro
ducts_id121
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29Project Schedule
Acquire Parts 2/11/08
Construct Antennas 3/17/08
Movement Detection 3/19/08
Implement Comp. Interface 4/1/08
Implement the Full System 4/22/08
30- Bring in computer to show pressure sensors
31Obstacles
Antenna Designs
32Our Design
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34WARNING EGRESS
DETECTED
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37Desired and Actual Specifications
Table 1. Technical Design Specifications
Specification Proposed Actual
RFID Reader
Transmitting Power 1W 2 dB 1W 2 dB
- Operating Frequency 13.56 MHz 13.56 MHz
Current Draw Max. 0.5 A Max. 0.5 A
Head-Section Antenna Dimensions 17 x 30 17 x 30
- Detectable Range 2 ft (24 in.) 1.5-1.75 ft. (18-21 in.)
Mid-Section Antenna Dimensions 9 x 30 9 x 30
- Detectable Range 2 ft (24 in.)
Foot-Section Antenna Dimensions 15 x 30 15 x 30
- Detectable Range 2 ft (24 in.)
Multiplexer
- Power Supply Not Proposed
Not Proposed
Not Proposed
Trossen Robotics 24 FSR
Force Sensitivity Range lt100 g to gt 10 kg lt100 g to gt 10 kg
Pressure Sensor Range lt 1.5 psi to gt 150 psi lt 1.5 psi to gt 150 psi
Sensitivity to Vibration Not Significantly Affected Not Significantly Affected
Allowed Patient Rest Time (No motion) 30 minutes 10 seconds
Pressure Senor Time Monitoring Every minute Every second
38Trossen Robotics FSR
39 40In your final oral report, you should describe
similar patented and commercially available
devices
- Explain details about your design and let us
know why your design is better