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P13027: Portable Ventilator

P13027: Portable Ventilator. Team Leader: Megan O’Connell Matt Burkell Steve Digerardo David Herdzik Paulina Klimkiewicz Jake Leone. Overview. Project Summary Customer Needs Engineering Specs System Block Diagram Functional Decomposition Risk Assessment Proposed Redesign.

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P13027: Portable Ventilator

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  1. P13027: Portable Ventilator Team Leader: Megan O’Connell Matt Burkell Steve Digerardo David Herdzik Paulina Klimkiewicz Jake Leone

  2. Overview • Project Summary • Customer Needs • Engineering Specs • System Block Diagram • Functional Decomposition • Risk Assessment • Proposed Redesign

  3. Project Scope Project Objective: Improve the current design of P13026 Duration: 27 weeks Market Release: 2015 Budget: $1000 Customer: Jeff Gutterman Roman Press Faculty Mentor: Edward Hanzlik Team: 4 Mechanical Engineers 2 Electrical Engineers

  4. Customer Needs

  5. Engineering Specifications

  6. System Block Diagram

  7. Functional Decomposition

  8. Top Level Functions

  9. Provide Airflow

  10. Monitor Feedback

  11. Communicate State

  12. Manage Power

  13. Risk Assessment

  14. From 13026 -> Our Foundation to Build On Updates: • Electronic controls (decrease size/more options) • Smaller pump • Reliable and smaller battery (2+ hours) • Device ergonomics and usability Additions: • Ability to monitor and record vitals • Pulse oximeterfeedback • Signaling alerts

  15. Revision B- Proposed Redesign Update: • Battery Size-> Reduce Size & keep same capacity • Reduce Circuit Board size-> Create custom board for all electrical connects • Phase motor driver to a transistor • Display Ergonomics • Overall Size and shape of PEV • Instruction manual Additions: • Visual Animated Display-> Moving Vitals • Memory capabilities • USB extraction of Data • Co2 Sensor as additional Feature to PEV • Overload Condition due to Pump Malfunction

  16. Batteries: Area for improvement • Decrease weight • Smaller size • Lower price • Higher power capacity

  17. Batteries

  18. Custom PCB Solution • We plan on using a custom mixed signal PCB solution • Advantages: • Reduce size and weight • greatly reduce production costs • Manufacturability • Flexibility • Disadvantages: • High development costs • A lot of work • Some risks involved

  19. Size and Weight • All electronics will fit on one PCB turning a volume into an area that can fit on the side of the enclosure and take up very little space

  20. Costs • Development costs will be high but production costs will be very low

  21. Manufacturability • Having only one board will minimize assembly time since fewer connections are required • Connections to be made: • Battery • LCD • Dials/Switches • Pump • Air lines to sensors

  22. Flexibility • We can customize our design to work with a wider variety of products • This will potentially reduce costs since we can choose the best and cheapest components

  23. Example: LCD Display • Selection of LCDs we can interface with is greatly increased • This allow us to use a display like this 7” diagonal touchscreen LCD available for only $97

  24. Risks of Custom PCB • We may have trouble figuring out how to interface with some of the new features, particularly the pulse oximeter • If there is a significant problem in the initial PCB ordered, another order will have to be made to fix it which will be just as expensive

  25. Housing Modifications • Smaller components = smaller package

  26. Housing Modifications • Old Physical Limits: • 15in long X 10in high X 7in deep • New Physical Limits: • 11in long X 6.75in high X 6.5 in deep

  27. Housing Modifications

  28. Additional Developmental Testing • Vibration Testing- How will the PEV stand up to external vibration and drop conditions? I. Random Vibration Frequency Testing (From 0- 2kHz) - Understand Natural Frequency of System (Resonance) and address measures to avoid this state - Specs: TBD II. Drop Testing - Understand g-forces with respect to system mass and height to drop. Allow us to make judgment on component damage. • Usability Testing on Major Display Components I. Understand General Usability-> Imagine RIT surveying (designed with Marie and David) II. EMT intelligent Usability-> Survey EMT and medical practitioners

  29. Improving Ease of Use • Improving User Interface • Providing Audio Feedback • Supplying medical staff with patient data

  30. Audio Feedback • We plan on providing the user with limited audio feedback to guide them through using the PEV • Simple Commands that cover the basic functions • Not a step-by-step instruction manual • Advantages: • Provides assistance in hectic environments • Could provide untrained personnel with guidance

  31. User Interface • Small Improvements to make the User Interface more “user-friendly” • Adding small sections of display above settings/mode knobs that correspond with the user-selected settings • LEDs to help guide user during operation

  32. USB Data Extraction • By implementing a USB connection on the custom board, data scripts will be able to be downloaded after using the device. • Text scripts will be time-stamped • ID-ing patients with a patient # • Recording important information such as vitals and/or air flow/compressions administered • Can be used by medical experts when needed for legal/health-related issues.

  33. Mass Flow Analysis(Between Pump outlet and Ventilator outlet) • Replacing Mass Flow Sensor with Venturi Analysis • Assume incompressible flow: Constant density

  34. Venturi Analysis compared to mass Flow Sensor • Cost: • Honeywell AWM2300V Mass Flow Sensor = $107.82 • Freescale MPX12 series Differential Pressure Sensor = $8.61 • Number of Parts: • Current design about 6 parts • Proposed design about 8 parts • Additional parts on the order of a few dollars (reducers) • Size: • Mass Flow Sensor = 1.24”x1.2”x0.61”=0.91 in3 • Differential Pressure Sensor = 1.15”x0.69”x0.43”=0.34 in3

  35. High Pressure Safety Improvements • Audio Alarm: Software triggered alarm if flow rate is out of bounds of pump inputs • Audio Alarm: Secondary pressure sensor records high back pressure • Mechanical Relief Valve: Fail safe to release system pressure if pressure exceeds a predetermined level

  36. Bench Marking High Pressure Precautions Both AutoVent and CAREvent have double redundant ways to assure the patient never experiences too high of pressure

  37. CO2 Disposable Sensor Benchmarking Current Technologies:

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