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ANTS - PowerPoint PPT Presentation


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Anesthesiology Neuromuscular Monitoring System. ANTS. #25. Group Information. Greg Angelotti (EE) Otto Cruz ( CpE ) Kristin “Zaza” Soriano ( CpE /EE) Sponsor: Dr. Thomas Looke (Anesthesiologist/EE). Current Methodology. Administer Neuromuscular Blocking Agents (NMBA)

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Presentation Transcript
group information
Group Information

Greg Angelotti (EE)

Otto Cruz (CpE)

Kristin “Zaza” Soriano (CpE/EE)

Sponsor: Dr. Thomas Looke (Anesthesiologist/EE)

current methodology
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
current methodology1
Current Methodology

*Courtesy of nursingcrib.com

current methodology2
Current Methodology

* Research shows not as reliable as the first two sites

objectives
Objectives
  • To safely stimulate targeted sites
  • To effectively obtain patient signals
  • To accurately record patient feedback
  • To create a more organized environment
requirements
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
current control
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).
current op amp
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.
dc to dc converter
DC to DC Converter
  • Optional part
  • Input 3.1 to 75 volts
  • Frequency Synchronization
negative feedback
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.
power supply
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.
surface emg
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]
pressure sensor conditioning
Pressure Sensor Conditioning

Inverting Amplifier

  • 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

Vout = (Vref)*(RG/Sensor)

bend sensor conditioning
Bend Sensor Conditioning

Inverting Amplifier

  • 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

Vout = (Vref)*(RG/Sensor)

touchscreen controller
Touchscreen Controller

Custom I2C

Voltage-level Shifter

GND

SCL

SDA

VIO

Pandaboard ES J6

Expansion Header

lcd controller
LCD Controller

LED Backlight

Control I/O

Pandaboard ES

J3/J4

30-pin LVDS

Connection

LCD I/O

tablet power
Tablet Power
  • 6 volts 10000 mAh
  • 23 x 99 x 71 mm
  • $15-17
tablet software
Tablet Software
  • Ubuntu
  • C++
  • qT
coming soon
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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