Transcript Hospital mattress device attachements to reduce risk of bedsores

RFID 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
OVERVIEW
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)
1/21
Bedsores
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
2/21
Nosocomial 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
3/21
Main Components of Project
4/21
5/21
Movement Monitoring System
Trossen Robotics 24” Force Sensing Resistor
Interface Kit 8/8/8
Voltage Divider
6/21
WARNING: PLEASE MOVE
TIMER: 30 Min
7/21
WARNING: EGRESS DETECTED
8/21
RFID
• Monitor patient contact
• System:
- Operating Frequency: 13.56MHz
- Target Range: 24” with 1 Watt reader
- Tags worn on wrist
9/21
RFID System
10/21
Identification
Process
11/21
WARNING: DR. SMITH PLEASE
STAND BACK
12/21
Multiplexer Design
Relays
Antennas
13/21
Competing Products
Total Care SpO2RT Hospital Bed
$28,500
Secure II Med/Surg Hospital Bed
$10,000
14/21
Product
Movement
Detection
System
RFID
System
Quantity
Unit
Price
Price
Trossen Robotics 24” FSR
4
$24
$80
HP Pavillion Slimline
s7700e PC
1
$400
$400
Cables
1
$10
$10
TI-FEIG RFID Reader [10]
1
$350
$350
Copper Plating
25 ft.
$20
$100
Antenna Board
1 pair
$100
$100
1
$250
$250
PIC Kit II Microprocessor
Total Equipment Cost
$1,290
wiring
10
200
Ni-USB 6008 DAQ
10
160
100
250
Trossen Robotics
Pressure Strips
TI-FEIG RFID
Reader
Copper Plating
350
Antenna Board
8
7
MicroITX
Motherboard
LCD Monitor
Cables
15/21
Selling Point
• No need to buy new beds
• Installed as add-on to existing beds
• Money saved
16/21
Current 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.)
Not Proposed
3.3 V
Multiplexer
-
Power Supply
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 Vibration
Not Significantly
Affected
Not Significantly
Affected
Allowed Patient Rest Time
30 minutes
10 seconds*
Senor Time Monitoring
Every minute
Every second*
17/21
Obstacle: Proximity to Metal
18/21
Alternative Solutions
• Dynasys 13.56 MHz Antenna
• 2 foot range
• De-Q feature
• $400
19/21
For Future Groups…
• Buy Professionally
made antennas
• Bedside Falls
20/21
For More Information Visit Us At
21/21
RFID Pressure Sensor System for Hospital
Mattresses to Prevent Infections and Bedsores
Bikram Virk
Sujoy Sanyal
Ryan Eiswerth
Wasif Khawaja
Mushfiq Saleheen
Proximity to Metals
• Difficult to find Matching Network
• 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
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
• Bring in computer to show pressure
sensors
Obstacles
Antenna Designs
18/21
Our Design
19/21
WARNING: EGRESS
DETECTED
Desired and Actual Specifications
Specification
Proposed
Actual
1W ± 2 dB
1W ± 2 dB
RFID Reader
-
Transmitting Power
- Operating Frequency
-
Current Draw
13.56 MHz
Max. 0.5 A
Head-Section Antenna
Dimensions
17” x 30”
- Detectable Range
2 ft (24 in.)
Mid-Section Antenna
Dimensions
9” x 30”
- Detectable Range
2 ft (24 in.)
Foot-Section Antenna
Dimensions
15” x 30”
-
Detectable Range
2 ft (24 in.)
Multiplexer
-
Power Supply
Not Proposed
13.56 MHz
Max. 0.5 A
17” x 30”
1.5-1.75 ft. (18-21 in.)
9” x 30”
15” x 30”
Trossen Robotics FSR
• How it works
5/21
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