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ANTS

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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ANTS

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  1. Anesthesiology Neuromuscular MonitoringSystem ANTS #25

  2. Group Information Greg Angelotti (EE) Otto Cruz (CpE) Kristin “Zaza” Soriano (CpE/EE) Sponsor: Dr. Thomas Looke (Anesthesiologist/EE)

  3. 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

  4. Current Methodology *Courtesy of nursingcrib.com

  5. Current Methodology * Research shows not as reliable as the first two sites

  6. Objectives • To safely stimulate targeted sites • To effectively obtain patient signals • To accurately record patient feedback • To create a more organized environment

  7. 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

  8. Overall Block Diagram

  9. Specifications

  10. Shocking Device Schematic

  11. Digital to Analog Converter • DAC 7800 Specification • Two 12 bit SPI controlled DAC. • 5 Volt Supply with a 10 Volt Reference • SPI Inputs CS, Din, and Clk. • Control inputs UPD_A, UPD_B, Clr. • Control OuputsOut_A, Out_B.

  12. Analog to Digital Converter • 24 input bits sent in three 8 bit pulses. • VDAC = (V–) + 4.75V – (31.6kΩ) (ILIM)/5000, Current and voltage control formula.

  13. OPA2336 Opamp • 5 Volt power supply • CMOS unity-gain to create a stable output. • Low offset voltage 125 micro Voltes max. • Low 20 micro Amps quiescent current.

  14. OPA547 Opamp • Single supply voltage range of 8 to 60 volts. • Peak output current of 750 mA and 500 mA continuous. • Current control signal ILIM of 0 to 150 micro Amps produces 0 to 750 mA output. • Voltage Control from 0.8 to 25 Volts output

  15. 5A200S DC-DC Converter • Supply voltage of 5 volts. • Output voltage of 250 volts peak and 200 volts continuous. • 0.1 microfarad capacitor. • Input voltage will be pulsed at selected waveform.

  16. TPS61093 DC-DC Converter • Supply voltage of 1.6 to 6 Volts. • Output voltage from 1.6 to 17 volts with a 1.1 Amp peak over current protection. • Three outputs 3.7, 5 , 10 volts, enable pins turn converters on. • R1 and R2 control output voltage.

  17. Overall Block Diagram

  18. Specifications

  19. Sensor Device

  20. Surface EMG • Choose targeted site • Prepare the site • Shave • Sanitize • Place Ag/Cl reference electrodes • Disc Electrodes [<10 mm] • Ready to read patient action potentials • 0-6 mV [Typical]

  21. sEMG Preconditioning

  22. Prototype sEMG Testing Differential Amplification (High Impedance) Differential Amplification Hand at rest

  23. Prototype sEMG Testing Full-Wave Rectification Smoothed Rectification

  24. Prototype sEMG Testing High Cut-Off and Final Gain Stage *Prototype Design Credit to Gundanium on instructables.com

  25. Sensor Device

  26. Tactile Pressure Sensor

  27. Pressure Sensor Conditioning Voltage Divider • Standard Resistance from sensor (FSR): • Appr. 1 MOhm • Vin comes from CR2032 • Appr. 3Volts • The more the surface is pressed, the less sensor resistance Vout = (Vin)*(R2/Rsensor+R2) R2 = 270 Ohms

  28. Sensor Device

  29. Flexible Potentiometer Sensor

  30. Bend Sensor Conditioning Voltage Divider • Standard Resistance from sensor (FSR): • Appr. 10 KOhm • Vin comes from CR2032 • Appr. 3Volts • The more the sensor bends the more the less impedance Vout = (Vin)*(R2/Rsensor+R2) R2 = 270 Ohms

  31. Overall Block Diagram

  32. Specifications

  33. Main Device

  34. Touchscreen

  35. Touchscreen Controller I2C Voltage-level Shifter GND SCL GND SDA SCL SDA 1.8 V 3.3 V VIO Pandaboard ES J6 Expansion Header 3.3 V Step-up

  36. Main Device

  37. TFT-LCD

  38. LCD Controller LED Backlight Control I/O Pandaboard ES J3/J4 30-pin LVDS Connection LCD I/O

  39. Main Device

  40. Pandboard ES

  41. Pandaboard ES

  42. MCU & Bluetooth

  43. Communication for BLE • Project specific • Medical Applications • Energy Efficiency • Protocol • Generic Attribute Profile (GAP/GATT) • Runs on top of Attribute Protocol • Server-Client Scheme • Characteristics hold values of readings

  44. GATT_Character_UUIDs

  45. Tablet Software • Ubuntu 12.10 armhf • Custom Kernel • Python • BlueZ stack • PyQtGraph • Plot real time response

  46. Monitoring Screen

  47. Bill of Materials (Tablet)

  48. Bill of Materials (Sensors)

  49. Bill of Materials (Total)

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