ants anesthesiology neuromuscular monitoring system #25
TRANSCRIPT
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ANTSAnesthesiology Neuromuscular
Monitoring System
#25
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Group Information
Greg Angelotti (EE)
Otto Cruz (CpE)
Kristin “Zaza” Soriano (CpE/EE)
Sponsor: Dr. Thomas Looke (Anesthesiologist/EE)
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Current Methodology
• Administer Neuromuscular Blocking Agents (NMBA)– Blocks Acetylcholine (ACh)
• Trivial neuromuscular stimulating• Subjective muscle response monitoring
(if any at all)• Pen and paper record keeping
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Current Methodology
*Courtesy of nursingcrib.com
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Current Methodology
Stimulate Monitor Laments
Ulnar Nerve Adductor Pollicis Thumb
Posterior Tibial Nerve Flexor Hallucis Brevis Foot
Facial Nerve Corrugator Supercilli Eyebrow*
Facial Nerve Orbicularis Occuli Eyelid*
* Research shows not as reliable as the first two sites
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Objectives
• To safely stimulate targeted sites• To effectively obtain patient signals• To accurately record patient feedback• To create a more organized environment
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Requirements
• Must consist of safe modular subsystems• Must obtain objective quantitative
muscular responses• Must produce individual patient feedback
and logging• Must reduce operating room clutter
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Overall Block Diagram
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SpecificationsShocking Device
Battery 3.7 Volt 2200 mAh Lithium Ion Polymer
Up Time 6 Hours
Idle Time 3 Days
Input Voltage 3.7 Volts
Output Current Variable 0 to 70 mA
Output Pulse Square Wave Pulse 200us Duration
Train of Four Single Set of 4 Pulses Per 2 Seconds
Tetanus 100 Hz (100 Pulses Per Second)
Twitch 1 Pulse Per Second
Dimensions 30 x 40 x 10 mm
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Shocking Device
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MCU & Bluetooth
Part CC2540 BLE112
Manufacturer Texas Instruments Bluegiga
Dimensions 6.5 x 6.5 x 1 mm
MCU 8051 8051
Memory 128/256 Kb 128/256 Kb
Transceiver Bluetooth 4.0 Bluetooth 4.0
Receiver 19.6 mA 19.6 mA
Transmitter 24.0 mA 27.0 mA
Power Consumption 2 to 3.6 volts 2 to 3.6 volts
Cost (Dev. Kit) $289.75 $350.00
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Shocking Device
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Shocking Device
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Current Control
• PWM to produce the 200us square wave form.
• 10 Bit Serial SPI Dual Output DAC to control current output.
• 2^10 taps (1024) with a 10 bit DAC• Issues deciding between Digital
Potentiometer (voltage) and DAC (voltage & current).
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Current Op amp
• Current input varies between 0 to 150 uA.• Current output 0 to 750 mA.• Availability and price is the reason for this
part.
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DC to DC Converter
• Optional part• Input 3.1 to 75 volts• Frequency Synchronization
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Shocking Device
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Negative Feedback
• DC Converter to ADC port on MCU• Digital Integral controller to regulate the
stimulation current.
• Using the formula above will allow us to control the stimulators output.
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Shocking Device
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Power Supply
• Voltage buck/boost regulator dual output 3.7 volts supplies processor & 5 volts supplies DAC
• Boost Voltage regulator supplies op amp at 8 volts
• The power supply is a 3.7 volt 2200 mAh lithium ion polymer.
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Overall Block Diagram
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SpecificationsSensor Device
Dimensions 30 x 40 x 10 mm
Battery 5 V
Up Time 6 Hours
Idle Time 3 Days
Data Transmission Bluetooth 4.0
Wireless Range <50 meters
Data Resolution 12 bit
Action Potential Detection 0 - 10 mV
Pressure Detection 0 - 10 lbs
Flex Sensor Angle 0 - 90 degrees
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Sensor Device
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Surface EMG
• Pick targeted sites • Prepare the site• Place Ag/Cl reference electrodes
• Ring Electrodes [preferred]• Disc Electrodes [<10 mm]
• Ready to read patient action potentials• 0-6 mV [Typical]
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sEMG Preconditioning
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Sensor Device
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Tactile Pressure SensorSensor FSR 400 A301
Manufacturer Sparkfun Electronics Tekscan
Sensing Area 0.3” 0.375”
Force Range 0-10 lbs 0-25 lbs
Response Time 1-2 usec <5 usec
Price 5.95 USD 16.25 USD
Image
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Pressure Sensor Conditioning
• Standard Resistance from sensor (FSR):– Appr. 1 MOhm
• VREF should be negative– Appr. -5 Volts
• The smaller RG is the more sensitive the sensor becomes
Inverting Amplifier
Vout = (Vref)*(RG/Sensor)
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Sensor Device
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Flexible Potentiometer SensorSensor FS7548 SoftSpot
Manufacturer Spectra Symbol Spectra Symbol
Length 114 mm 100 mm
Thickness .48 mm .51 mm
Resistance Range 1 KOhm – 100 KOhm 1 KOhm – 10 KOhm
Price 14.95 USD 12.95 USD
Image
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Bend Sensor Conditioning
• Standard Resistance from sensor (FSR):– Appr. 10 KOhm
• VREF should be negative– Appr. -5 Volts
• The more the sensor bends the more the greater the impedance
Inverting Amplifier
Vout = (Vref)*(RG/Sensor)
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Sensor Device
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Power Distribution
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Overall Block Diagram
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Specifications
Tablet Device
Dimensions 10” x 6 ¾” x 2”
Battery 4000 mAh, 5V
Up Time 4 Hours
Idle Time 8 Hours
Data Transmission Bluetooth 4.0
Wireless Range <50 meters
Screen Resolution 1024 x 600 pixels
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Main Device
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TouchscreenParameter Specification
Diagonal Size 10.1”
Aspect Ratio 16:9
Resolution 4096 x 4096
Accuracy ±1.5 %
Transmissivity 90 %
Active Current 6 mA
Sleep Current 94 µA
Digital Power Supply 3.3 VDD
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Touchscreen ControllerCustom I2C
Voltage-level Shifter
Pandaboard ES J6Expansion Header
GND
SCL
SDA
VIO
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Main Device
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TFT-LCDParameter Specification
Diagonal Size 10.1”
Frame Rate 60 Hz
Resolution 1024 x 600 pixels
Maximum Power Consumption 2.6 W
Maximum Backlight Power Consumption 1.5 W
Thickness 0.5 mm
Digital Power Supply 3.3 VDD
IDD Current 240 mA
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LCD Controller
LED BacklightControl I/O
30-pin LVDSConnection
LCD I/O
Pandaboard ESJ3/J4
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Main Device
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Pandboard ES
Features
Dual Core ARM Cortex A9 (1.2 GHz)
Graphics support (ex: OpenGL)
LCD expansion header
1 GB low power DDR2 RAM
SD card slot
General I2C expansion headers
802.11 b/g/n (WiFi)
Bluetooth 4.0
Awesome support community!
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Pandaboard ES
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Main Device
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Tablet Power
• 6 volts 10000 mAh• 23 x 99 x 71 mm• $15-17
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Tablet Software• Ubuntu• C++• qT
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Monitoring Screen
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Bill of Materials (Tablet)
Item Cost
10.1” TouchScreen Free
10.1” TFT-LCD Display $41.89
LVDS Cable $9.88
LCD Controller Expansion $57.18
Pandaboard ES $180.48
Power adapter (dev) $16.99
2.45mm pitch male pin headers $6.46
USB to RS-232 adapter (dev) $7.00
HDMI to DVI cable (dev) $4.56
8Gb SD card Free
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Bill of Materials (Sensors)
Item Cost
sEMG Electrodes FREE
Pressure Sensor $5.95
Bend Sensor $12.95
Rotary Potentiometer $1.75
Low Noise Op Amp x 3 $2.32
Differential Amp $10.25
CC2450 Developers Kit (2 Modules) $289.75
PCB Cost (Expected) $70.00
Misc (Resistors,Capacitors,Diodes,etc) Free
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Bill of Materials (Total)
Device Total Cost
Main Device (Tablet) $324.44
Sensor Device $392.97
Shocking Device $70
Running Total $787.41
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Progress
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Coming Soon?
• Finish prototyping• Finalize sensor PCB schematic for printing• Program microcontrollers• Sync Bluetooth devices• Integrate tablet parts• Software development• …Profit
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Questions?