P 13027 Portable Ventilator Team Leader Megan OConnell

P 13027: Portable Ventilator Team Leader: Megan O’Connell Matt Burkell Steve Digerardo David Herdzik Paulina Klimkiewicz Jake Leone 1 of 52

Technical Review Overview � Engineering Specs � Proposed redesign � Battery and Power Calculations � Power: Electrical � Electric Board Layout � MCU Logic � Pressure Sensor � Thermal Analysis � Housing Modifications � Project Comparison � Project Schedule � Questions? 2 of 2 52

Engineering Specifications Portable Emergency Ventilator Engineering Specifications - Revision 1 - 03/19/13 Specification Number Source Function Specification (Metric) Unit of Measure Marginal Value S 1 PRP System Volume Control Liters S 2 PRP System Breathing Rate BPM, Breaths per Minute S 3 PRP System Pick Flow Liter/Min S 4 PRP System Air Assist Senitivity cm H 20 0. 5 ± 0. 5 S 5 PRP System High Pressure Alarm cm H 20 10 - 70 S 6 PRP System DC Input Volts 6 - 16 S 7 PRP System DC Internal Battery Volts 12 S 8 PRP System Elasped Time Meter Hours 0 - 8000 S 9 PRP System Pump Life Hours 4500 S 10 PRP System O 2 / Air mixer O 2 S 11 PRP System Secondary Pressure Relief cm H 20 75 S 12 PRP System Timed Backup BPM S 13 PRP System Weight Kg ≤ 8 Drop Height meter S 14 3 of 3 52 Robustness Ideal Value Comments / Status 0. 2 ± 0. 2 4 -15 15 - 60 21% - 100 % 1 Due to battery, must be greater than 9 V

Revision B- Proposed Redesign Update: 1. 2. 3. 4. 5. 6. 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: 1. 2. 3. 4. 5. 4 of 4 52 Visual Animated Display-> Moving Vitals Memory capabilities USB extraction of Data Co 2 Sensor as additional Feature to PEV Overload Condition due to Pump Malfunction

Revision B- Proposed Redesign Update: 1. 2. 3. 4. 5. 6. Battery Size-> Reduce Size & keep same capacity Reduce Circuit Board size-> Create custom board for all electrical connects Phase motor driver to a transistor NOT Discussed Display Ergonomics within Technical Overall Size and shape of PEV Review Instruction manual Additions: 1. 2. 3. 4. 5. 5 of 5 52 Visual Animated Display-> Moving Vitals Memory capabilities USB extraction of Data Co 2 Sensor as additional Feature to PEV Overload Condition due to Pump Malfunction

Battery Choice: Tenergy Li-Ion � 14. 8 V � 4400 m. Ah � 0. 8375 lbs � 7. 35 cm x 7. 1 cm x 3. 75 cm �Rechargeable up to 500 times �Price: $50. 99 6 of 6 52

Power Calculation 7 of 7 52 Current (A) Voltage (V) Power (W) Pump 3 11. 1 16. 65 MCU + electronics 0. 5 3. 3 1. 65 LCD 0. 15 10 1. 5 Total 3. 65 19. 8 Battery Voltage (V) 14. 8 Battery Capacity (Ah) 4. 4 Battery Capacity (Wh) 65. 12 Expected Battery Life (Hrs) 3. 29

Charger (Brick) �HP AC Adapter � 18. 5 V � 3. 5 Amps �Power: 65 W �Max power: 70 W �Price: $14. 35 (Amazon) 8 of 8 52

Regulation of Power 9 of 9 52

Maxim Integrated MAX 1737 Battery. Charge Controller • Wide input voltage range (6 - 28 V) • Charges up to four Li+ Cells (4 -4. 4 V per cell) • Provides overcharge protection 1010 of 52

Texas Instruments LM 3940 Low Dropout Regulator • Provides 3. 3 V from a 5 V supply • Low Dropout Regulator • Can hold 3. 3 V output with input voltages as low as 4. 5 V • Few external components needed for implementation 1111 of 52

ON Semiconductor MC 7800 Voltage Regulator � 5 -18, 24 V Input voltage range � Can deliver output currents greater than 1 A � No external components needed for implementation � Internal thermal overload protection 12 of 52 12

System Operation Flowchart 1313 of 52

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Control System 1919 of 52

MCU Pinouts 2020 of 52

General PCB Parts Placement 2121 of 52

Sp. O 2 Sensor • Difference in Absorption between Red and Infrared is used to determine Sp. O 2 2222 of 52

Sp. O 2 Sensor Continued Simplified Design: 2323 of 52

Sp. O 2 Flow Chart 2424 of 52 Source: Freescale Pulse Oximeter Fundamentals and Design

Hardware/Software Feature Implementation Plan Function Hardware Software User controllable ventilator control system 1 1 LCD Interface 1 1 Audio Feedback 1 1 Memory retention/ transfer 1 2 Touch Interface 1 3 Integrated Battery Charging 2 N/A Sp. O 2 2 2 CO 2 2 2 Audio Recording 3 3 � 1 - High Priority- This will get implemented � 2 - Medium Priority- Foreseeable difficulties may prevent proper 2525 of 52 implementation � 3 - Low Priority- Attempt to implement if time constraints allow

Initial strategy for Testing 2626 of 52

Mass Flow Analysis (Between Pump outlet and Ventilator outlet) Replacing Mass Flow Sensor with Venturi Analysis • Assume incompressible flow, 10 diameters of straight tube, C=. 99 2727 of 52

Differential pressure sensor selection 28 28 of 52

Freescale-mpxv 5050 dp Pressure Sensor 29 29 of 52

Temperature Compensation 3. 3 V 3030 of 52

Expected Pressure change & voltage output 31 31 of 52

Expected Centerline Velocity 3232 of 52

EXPECTED Total Head Loss 3333 of 52

Expected Major Head Loss Bernouli’s Equation Assumptions • Constant velocity, height and air density Major Head Loss: • Dependent on length of tube between ventilator and pump exit 3434 of 52

Expected Minor Head Loss Bernouli’s Equation Assumptions • Constant velocity, height and air density Minor Head Loss • Dependent on the expansion and contraction for Reducer and Diffuser 3535 of 52

Exhaust Pressure Sensor 3636 of 52

Mechanical Relief Valve Pressure Release at 1 psi Reusable 3737 of 52

Thermal Analysis Heat Dissipation GOAL: Analyze worst case thermal analysis of system to understand effects of system heat ①dissipation. System Components: ④ ② Applied Heat Loads: Control Volume Schematic: PE V T∞=330 K h= 5 W/m^2 K (Applied to all surfaces) ③ Assumptions: 1. 2. 3. 4. 3852 5. 38 of Neglect Radiation Casing acts as a control volume System Location at hottest temp every recorded for U. S 330 K Heat flux is applied at bottom surface where all components will rest on. Free External Convection Q flux=80 W

3952 39 of ⑤ Heat Dissipation Results: High Temperature: 359 K 86 ⁰C For our material, Polystyrene, The glass transition temperature is 95 ⁰C. Therefore at worst case scenario, the material will hold shape without deforming. Top of enclosure shows little heat transfer concern to handle so user can carry device. A rubber handle will be included on prototype as a precautionary measure as well as usability purposes.

Another approach… ① Bottom Surface Heat Dissipation: ② Assumptions: 1. Component temperature is worst case. 2. System has been under worst case condition for extended period of time. 3. Neglect convection and radiation on bottom surface. ③ Results: 1. 4040 of 52 2. Plastic temperature at worst case will never exceed 120⁰F due to component heating alone. This temperature is not enough to deform the polystyrene surface or cause damage to surrounding

Housing Modifications � 13026 Physical Extremes: � 15 in long X 10 in high X 7 in deep �Projected 13027 Physical Extremes: � 12 in long X 7. 5 in high X 7 in deep 4141 of 52

Housing Modifications 4242 of 52

Housing Modifications Speaker Mode O 2 Sensor port CPR Compression CO 2 Sensor port Manual Mask tube ports Power 4343 of 52 BPM Flow Rate Pressure Limit

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Project Comparison GOAL: Analyze the size and weight reduction between major contributing components of MSD 13026 PEV to our projected design. 4949 of 52

Summar y: 5050 of 52

13027 – Project Schedule through MSD 1 Project Familiarization/ Research: 5152 51 of END OF MSD 1

Technical Evaluations/ Begin Prototyping: END OF MSD 1 5252 of 52