Portable multi-channel wireless
biomedical signal transmission system
Presenter: An-Hsien Yin
Adviser: Dr. Hung-Chi Yang
Outline
• Introduction
• Purpose
• Background
• Material & Methods
• Preliminary Results
• Future works
• References
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Introduction
• Recently wireless technology and products
Cell phone
Earphone
Keyboard & Mouse
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Gamepad
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Introduction
• Today, many medical instruments have been
widely used in hospitals, but most of the
ones still are wired connection. It makes
these instruments be restricted, and reduces
the convenience of using them.
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Introduction
EEG instrument
ECG instrument
EKG instrument
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Purpose
• Design a multiple channel, bidirectional biotelemetric platform, suitable for
real-time monitoring of several physiological parameters.
Sensor
Host
Sensor
User
terminal
Sensor
• Multi-hop transmission
End device
Router
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Coordinator
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Background
The packaged capsule and its contents.
(a) The inner structure-top side
(b) The inner structure-bottom side
(c) The fixing of sensor chips into the sensor holder
clamps
(d) Alignment procedure with the outer case
•P. Valdastri, A. Menciassi, A. Arena, C. Caccamo, P. Dario, An implantable telemetry platform system for
in vivo monitoring of physiological parameters, IEEE Trans. Inf. Technol. Biomed. 8 (3) (2004) 271–278.
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Background
ISM band ( Industrial Scientific Medical Band,
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工業，科學和醫療協會頻段 )
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Background
A block diagram of the telemetry system.
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D. Rollins, C. Killingsworth, G. Walcott, R. Justice, R. Ideker, W. Smith, A telemetry system for the study of
spontaneous cardiac arrhythmias, IEEE Trans. Biomed. Eng. 47 (7) (2000) 887–892.
Background
A: Schematic illustration of pressure-volume
telemetry system
B: Schematic illustration of pressure
conductance catheter
C: Block diagram of an analog processor
transmitter
K. Uemura, T. Kawada, M. Sugimachi, C. Zheng, K. Kashihara, T. Sato, K. Sunagawa, A self-calibrating
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telemetry system for measurement of ventricular pressure–volume relations in conscious, freely moving10
rats, Am. J. Physiol. Heart Circ. Physiol. 287 (6) (2004) H2906–H2913.
Background
Comparison of the UWB, Bluetooth, and ZigBee Protocols
UWB
Bluetooth
ZigBee
Range (Nom)
100 m
10m
10-300m
Data Rate
High(2M bps~54M bps)
Medium(1M bps)
Low(250k bps)
Power Req
low
Very Low
Ultra low
Tx Power
200 uW
1mW
< 1mW
Security
Excellent
Good
Good
Tx Penetrate
Excellent
Good
Good
Stability
Evolving
Excellent
Good
2.4 GHz
2.4 GHz
Frequency
Nodes
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7
2.4 GHz
65535
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Background
• Ultra low power sleep mode and very
short wake up times
• Allow to connect up to 65,536 devices
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Background
ZigBee protocol stack
• ZigBee
– Based upon the robust, reliable,
international IEEE 802.15.4
standard
• IEEE STD
802.15.4®
– Designed by Motorola, Philips
and other companies to supply
the radio and protocol, allowing
the designer to concentrate on
the application and their
customers’ needs
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APPLICATION/PROFILES
APPLICATION FRAMEWORK
NETWORK/SECURTIY
LAYERS
ZigBee
Alliance
Platform
MAC LAYER
IEEE
PHY LAYER
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Background
Mesh
Cluster Tree
Star
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PAN Coordinator
Router
End device
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Background
Multi-hop
transmission
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Research Structure
Improve
sample rate
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Set
multi-hop
Avoid
collision
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Material & Methods
Function generator
Transmitter
Receiver
Antenna
Antenna
ZigBee module
Sine wave
ADC
ZigBee module
RF
Wireless transmission
RS232
Display by LabVIEW
The structure of Transmitter system
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Material & Methods
•
Hardware
–
Function generator (Instek SFG-830)
–
Oscilloscope (Tektronix Tds-1012)
–
ZigBee module (TI CC2430)
•
Software
–
IAR Embedded Workbench (IAR)
–
LabVIEW (National Instruments)
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Material & Methods
CC2430 module
Features
 2.4 GHz IEEE 802.15.4 systems
 ZigBee systems
 High-Performance and Low-Power
CC2430 module
8051-Compatible Microcontroller
 Wide supply voltage range (2.0 V ~ 3.6 V)
 Eight channel, 8-14 bit ADC.
 Four timers: one general 16-bit timer, two general 8-bit timers, one
MAC timer
 Two programmable USARTs for master/slave SPI or UART
operation
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Material & Methods
Start
RF
Interrupt ISR
Mesh
Initial device
Identify the
address number
Create the
network
Node join?
Copy ADC data
from RX buffer
to array
No
Output the
ADC data to
the UART
Yes
Distribute a address
number to the node
Receive RF signal?
Coordinator
No
RETFIE
Yes
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Flow chart of Receiver (Coordinator)
Material & Methods
Start
TIMER
Interrupt ISR
Mesh
Initial device
Get ADC data
Request join
the network
Join
Successful?
No
Store ADC data
to array
Router
Yes
Enable ADC
Enable TIMER
Reference voltage: AVDD (3.3 V )
Resolution: 8 bit
Send to
Coordinator
Time: 0.96m sec
No
RETFIE
TIMER overflow
Yes
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Flow chart of Transmitter (Router)
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Material & Methods
Function generator
Router
Wireless transmission
Coordinator
50 Hz
Oscilloscope
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Preliminary Results
50.2575 Hz
960
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LabVIEW display interface
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Preliminary Results
Display in oscilloscope
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Display in LabVIEW
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Future works
• Improvement of the multiple physiological
parameters transmitter system
– Multiple channel
– Multi-hop transmission
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References
• P. Valdastri, A. Menciassi, A. Arena, C. Caccamo, P. Dario, An
implantable telemetry platform system for in vivo monitoring of
physiological parameters, IEEE Trans. Inf. Technol. Biomed. 8 (3)
(2004) 271–278.
• D. Rollins, C. Killingsworth, G. Walcott, R. Justice, R. Ideker, W.
Smith, A telemetry system for the study of spontaneous cardiac
arrhythmias, IEEE Trans. Biomed. Eng. 47 (7) (2000) 887–892.
• K. Uemura, T. Kawada, M. Sugimachi, C. Zheng, K. Kashihara, T.
Sato, K. Sunagawa, A self-calibrating telemetry system for
measurement of ventricular pressure–volume relations in conscious,
freely moving rats, Am. J. Physiol. Heart Circ. Physiol. 287 (6) (2004)
H2906–H2913.
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Thank you.
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