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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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Anesthesiology Neuromuscular MonitoringSystem

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)

    • Blocks Acetylcholine (ACh)

  • Trivial neuromuscular stimulating

  • Subjective muscle response monitoring (if any at all)

  • Pen and paper record keeping


Current Methodology

*Courtesy of nursingcrib.com


Current Methodology

* Research shows not as reliable as the first two sites


Objectives

  • To safely stimulate targeted sites

  • To effectively obtain patient signals

  • To accurately record patient feedback

  • To create a more organized environment


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


Overall Block Diagram


Specifications


Shocking Device


MCU & Bluetooth


Shocking Device


Shocking Device


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 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

  • Optional part

  • Input 3.1 to 75 volts

  • Frequency Synchronization


Shocking Device


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.


Shocking Device


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.


Overall Block Diagram


Specifications


Sensor Device


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]


  • sEMG Preconditioning


    Sensor Device


    Tactile Pressure Sensor


    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)


    Sensor Device


    Flexible Potentiometer Sensor


    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)


    Sensor Device


    Power Distribution


    Overall Block Diagram


    Specifications


    Main Device


    Touchscreen


    Touchscreen Controller

    Custom I2C

    Voltage-level Shifter

    GND

    SCL

    SDA

    VIO

    Pandaboard ES J6

    Expansion Header


    Main Device


    TFT-LCD


    LCD Controller

    LED Backlight

    Control I/O

    Pandaboard ES

    J3/J4

    30-pin LVDS

    Connection

    LCD I/O


    Main Device


    Pandboard ES


    Pandaboard ES


    Main Device


    Tablet Power

    • 6 volts 10000 mAh

    • 23 x 99 x 71 mm

    • $15-17


    Tablet Software

    • Ubuntu

    • C++

    • qT


    Monitoring Screen


    Bill of Materials (Tablet)


    Bill of Materials (Sensors)


    Bill of Materials (Total)


    Progress


    Coming Soon?

    • Finish prototyping

    • Finalize sensor PCB schematic for printing

    • Program microcontrollers

    • Sync Bluetooth devices

    • Integrate tablet parts

    • Software development

    • …Profit


    Questions?


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