RFID Pressure Sensor System for Hospital Mattresses to Prevent Infections and Bedsores
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Transcript of RFID Pressure Sensor System for Hospital Mattresses to Prevent Infections and Bedsores
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RFID Pressure Sensor System for Hospital Mattresses to Prevent Infections and Bedsores
Bikram Virk Sujoy Sanyal
Ryan EiswerthWasif Khawaja
Mushfiq Saleheen
Dr. Koblasz, ECE4884 L05 April 22, 2008
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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)
OVERVIEW
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2/21
Bedsores
• 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
Life-Threatening
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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
Nosocomial Infections
3/21
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Main Components of Project
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Movement Monitoring System
6/21
Interface Kit 8/8/8 Voltage Divider
Trossen Robotics 24” Force Sensing Resistor
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WARNING: PLEASE MOVE
TIMER: 30 Min
7/21
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WARNING: EGRESS DETECTED
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• Monitor patient contact• System:
- Operating Frequency: 13.56MHz - Target Range: 24” with 1 Watt reader - Tags worn on wrist
RFID
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RFID System
10/21
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Identification Process
11/21
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WARNING: DR. SMITH PLEASE STAND BACK
12/21
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Multiplexer Design
Relays
Antennas
13/21
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Total Care SpO2RT Hospital Bed $28,500
Secure II Med/Surg Hospital Bed
$10,000
Competing Products
14/21
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Product Quantity Unit Price
Price
Movement Detection System
Trossen Robotics 24” FSR 4 $24 $80
HP Pavillion Slimline s7700e PC
1 $400 $400
Cables 1 $10 $10
RFID System
TI-FEIG RFID Reader [10] 1 $350 $350
Copper Plating 25 ft. $20 $100
Antenna Board 1 pair $100 $100
PIC Kit II Microprocessor 1 $250 $250
Total Equipment Cost $1,290
15/21
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Selling Point
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• No need to buy new beds
• Installed as add-on to existing beds
• Money saved
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Current StatusSpecification 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 <100 g to > 10 kg <100 g to > 10 kg
- Pressure Sensor Range < 1.5 psi to > 150 psi < 1.5 psi to > 150 psi
- Sensitivity to VibrationNot Significantly
AffectedNot Significantly
Affected
Allowed Patient Rest Time 30 minutes 10 seconds*
Senor Time Monitoring Every minute Every second*
17/21
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Obstacle: Proximity to Metal
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Alternative Solutions • Dynasys 13.56 MHz Antenna
• 2 foot range
• De-Q feature
• $400
19/21
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For Future Groups…
20/21
• Buy Professionally
made antennas
• Bedside Falls
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For More Information Visit Us At
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RFID Pressure Sensor System for Hospital Mattresses to Prevent Infections and Bedsores
Bikram Virk Sujoy Sanyal
Ryan EiswerthWasif Khawaja
Mushfiq Saleheen
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Proximity to Metals
• Difficult to find Matching Network
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• 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?products_id=121
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Project 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
14/21
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• Bring in computer to show pressure sensors
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Antenna Designs
Obstacles
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Our Design
19/21
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WARNING: EGRESS DETECTED
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Desired and Actual SpecificationsSpecification 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 <100 g to > 10 kg <100 g to > 10 kg
- Pressure Sensor Range < 1.5 psi to > 150 psi < 1.5 psi to > 150 psi
- Sensitivity to VibrationNot Significantly
AffectedNot Significantly
Affected
Allowed Patient Rest Time (No motion)
30 minutes 10 seconds*
Pressure Senor Time Monitoring Every minute Every second*
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Trossen Robotics FSR
• How it works
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In 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