P13026: Portable Ventilator

1. P13026: Portable Ventilator Team Leader: Daniel Fenton Kennedy Kong Marie Revekant David Engell Eric Welch Derek Zielinski Chris Freeman Melissa Harrison Ryan Muckel Roberto Castillo Zavala

2. Engineering Specifications

3. PUGH MatrixMass Flow sensor

4. HONEYWELL AWM2100V FEATURES • Bidirectional sensing capability • Actual mass air flow sensing •Low differential pressure sensing The AWM2000 Series microbridge mass airflow sensor is a passive device comprised of two Wheatstone bridges. Data is transmitted via analog.

5. Honeywell AWM2100v cont. Performance Characteristics @ 10.01 +/- 0.01 VDC, 25°C

6. PUGH matrixPressure sensor

7. NPC-1210-005-a-1-l Low Pressure Sensor • Applications: • Medical Equipment • Ventilation • Respirator monitoring • Features: • High Sensitivity • High accuracy • CB mountable package • DIP package • Solid-state reliability • Individual device traceability

8. NPC-1210-005-a-1-l Low Pressure Sensor

9. PUGH MatrixControl system

10. Feature Analysis • 10 low-power modes to provide power optimization based on application requirements Allows different power states while being powered on. • Standby state if the device is not running the ventilation cycle • General-purpose input/output Allows sensors with analog outputs to communicate through common digital logic • Two 16-bit SAR ADCs • We might be able to use these to read from the analog sensors. • 16bit resolution is pretty good • Programmable gain amplifier (PGA) • Similar to an OP AMP circuit, this would control the gain digitally. • Two I2C modules • Some of the sensors have I2C output • Storage Features • This has a SD card controller so it can write to data to SDHC (High capacity SD cards) devices.

11. PUGH MatrixPump

12. PUGH MatrixPump Selection

13. Parker T1-1HD-12-1NEA • Peak Flow = 32.5* LPM • 12 VDC • Weight = 1.5 kg • Pump Life = 3500 hours • 16.5 x 7 x 9.9 cm (6.5 x 2.75 x 3.91 in)

15. Tubing Head Loss Analysis(Between Pump outlet and Ventilator outlet) Bernouli’s Equation Assumptions • Constant velocity, height and air density Major Head Loss: • Dependent on length of tube between ventilator and pump exit Minor Head Loss • Dependent on the expansion and contraction for two T-joints

16. Pump heat generation Pump Power Consumption • Obtained from pump specs: 20 W at 11.1 V and 1 psi Overall Pump Efficiency • Obtained from pump specs • Some input power goes into vibration, heat generation and sound Heat Generation Calculation • Done for worst case scenario • No vibration or sound (i.e. all wasted energy goes into heat generation) • Done with a factor of safety of 1.5 (i.e. Power = 30 W instead of 20)

17. PUGH MatrixLithium Ion Battery

18. Powerizer 18650 12V Li-Ion 77 Wh 1.5 lbs. 5" x 3.1" x 1.7" (26.35 in3) Built in charging port, prevents overcharging Comes with 100V-240VAC charger Low battery audible alert Price: $125, exc. tax & shipping Lead time: 5 days

19. PowerStream PST-MP3500-I • 12V, 5V Li-Ion • 60 Wh • < 1 lb. • 3.3" x 6.8" x 0.9" (20.2 in3) • Built in charging port, prevents overcharging • Comes with 90-240VAC charger, can also be charged with 9-24VDC • Low battery audible alert • Price: $200, inc. tax & shipping • Lead time: ?

20. Power Flow

21. Feasibility

22. PUGH MatrixUser Controls

23. PUGH MatrixUser interface

24. 13 Principles of Display Design • Make displays legible (or audible) • Avoid absolute judgment limits • Top-down processing • Redundancy gain • Discriminability • Pictorial Realism • Moving Part (compatibility) • Information access cost • Proximity Compatibility • Multiple resources • Predictive aiding • Knowledge in the world • Consistency Perceptual Principles Mental Model Principles Principles based on Attention Memory Principles

25. Make displays legible (audible) Mediresp III Prototype Values will be shown as figures (digital) CPR instruction will be audible Gradient of any knob will be labeled (color, graphic) • Values that are set are not readable • Alarm beep without verbal instructions • Ability for confusion with setting (breaths/minutes and liters/breath) • Scales for knobs are not readable

26. Avoid Absolute Judgments Medirep III Prototype Gradient of any knob will be labeled (color, graphic) • Confusion for scales of knobs- begins and ends at “0”? • CPR- Are there selection in-between 1-3-5?

27. Top-down Processing/ Discriminability Mediresp III Prototype All signals should be shown to account for what the operator predicts • All knobs with number turn in same fashion except for CPR which only has 3-options • Sizing of all knobs are the exact same which could lead to functionality confusion

28. Redundancy Gain Mediresp III Prototype LCD screen will show individual value reading and continuous value reading- different colors used for different readings • none

29. Proximity Compatibility Principle Mediresp III Prototype Less controls and more of a usage of LCD screen- take away problem of screen-control proximity Any necessary knobs will be lined up with display information • Charge and alarm LED’s are similar in looks but not directly close to controls • Spatial distance between knobs and associated label • Displays that show pertinent information not centrally located • All functions lined up horizontally

30. New Design Principles • Principle of pictorial realism • Battery charge displayed as symbol for battery • Heart rate indicated by heart symbol • Adding more symbols to redundantly display realism • Principle of moving part • Any loaded data will mimic real movement and typical psychological movements in humans

31. Control Ideas

32. PUGH MatrixHousing

33. Plastic Sheeting • Strong • Waterproof • Connections (screws, bolts, etc.) easily attached • Cost Effective • Between $6-$40 for 2880 square inches. • Adjustable / Easily Worked With • When heated, becomes extremely flexible and can be bent to specified angles. (Vaccu-form, manual shaping) • When cooled, retains shape and strength.

34. Questions