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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



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

Current methodology2

Current Methodology

* Research shows not as reliable as the first two sites



  • To safely stimulate targeted sites

  • To effectively obtain patient signals

  • To accurately record patient feedback

  • To create a more organized environment



  • 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

Overall Block Diagram



Shocking device

Shocking Device

Mcu bluetooth

MCU & Bluetooth

Shocking device1

Shocking Device

Shocking device2

Shocking Device

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

Shocking device3

Shocking Device

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.

Shocking device4

Shocking Device

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.

Overall block diagram1

Overall Block Diagram



Sensor device

Sensor Device

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]

  • Semg preconditioning

    sEMG Preconditioning

    Sensor device1

    Sensor Device

    Tactile pressure sensor

    Tactile Pressure Sensor

    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)

    Sensor device2

    Sensor Device

    Flexible potentiometer sensor

    Flexible Potentiometer 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)

    Sensor device3

    Sensor Device

    Power distribution

    Power Distribution

    Overall block diagram2

    Overall Block Diagram



    Main device

    Main Device



    Touchscreen controller

    Touchscreen Controller

    Custom I2C

    Voltage-level Shifter





    Pandaboard ES J6

    Expansion Header

    Main device1

    Main Device

    Tft lcd


    Lcd controller

    LCD Controller

    LED Backlight

    Control I/O

    Pandaboard ES


    30-pin LVDS


    LCD I/O

    Main device2

    Main Device

    Pandboard es

    Pandboard ES

    Pandaboard es

    Pandaboard ES

    Main device3

    Main Device

    Tablet power

    Tablet Power

    • 6 volts 10000 mAh

    • 23 x 99 x 71 mm

    • $15-17

    Tablet software

    Tablet Software

    • Ubuntu

    • C++

    • qT

    Monitoring screen

    Monitoring Screen

    Bill of materials tablet

    Bill of Materials (Tablet)

    Bill of materials sensors

    Bill of Materials (Sensors)

    Bill of materials total

    Bill of Materials (Total)



    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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