VENTILATOR DESIGN
Design Philosophy
We have defined our overall design philosophy according to the emergency situation ahead. The following are our key components.
Open Source – for use worldwide and contributions from others worldwide.
Adult ventilator – older adults are at higher risk.
Assist and Mandatory mode of ventilation.
A bare bones, safe design.
The design(s) will be validated; validation will be documented and transparent.
The design(s) will be modular allowing different modules to be mixed and matched depending on local availability
Unboxed Design– all parts directly accessible
Design will be inexpensive to build (parts for base model less than $3000 US).
Assembled quickly with readily accessible parts
Dissemination via Internet (Google docs, Github, website)
Documents
The following relevant documents for the OpenVentPk ventilator are available in the google drive
OpenVentPK Github
OpenVentPK has been organized on GitHub and all the documentation, the latest codes of embedded system, the schematics, the 3D files of all schematics are available there.
Design Details- Latest details are in “Main documents” & “Github”.
The following Specifications have been vetted against the requirements put forward in the second edition (11/04/2020) of Pakistan Engineering Council (PEC) document titled Fast Track Acceptance Test Procedure for Locally Manufactured Mechanical Ventilators for ICU
Measured Parameters:
| Modes of Ventilation: | |
| Controlled Modes | PCV, VCV |
| Assist Modes | PCV, VCV |
| Set Parameters: | |
| PEEP | (5cm H20 upto 20 cm of H20), |
| Fi02 | (0.21-1), |
| Tidal Volume | (200-600 ml) |
| I: E Ratio | (1:1 to 1:3), |
| Triggering | (Flow triggering-O.S to 5 liters per minute), |
| Respiratory rate | (8-35 per minute), |
| pressure control | (0-40 cm H20), |
| Measured Parameters: | |
| Exhaled Tidal Volume | |
| Respiratory rate | |
| Plateau Pressure | |
| Peak airway pressure | |
| Fi02 | |
| Cycling | |
| Flow | |
| Pressure | |
| Volume | |
| Alarms | |
| Battery alarm | |
| Circuit Integrity alarm | |
| High and Low Breath Rate alarm | |
| Peak Inspiratory Pressure alarm | |
| Fi02 alarm | |
| Oxygen failure alarm | |
| tidal volume alarm | |
| Minute volume alarm | |
| Disconnection alarm | |
| Type | |
| Invasive & Non-invasive Ventilation (Adult) | |
| S.No | Items | Specs | Qty |
|---|---|---|---|
| 1 | Arduino | Mega2560 | 1 |
| 2 | Stepper Motor | NEMA 23 | 2 |
| 3 | Stepper Motor Driver | A4988 | 1 |
| 5 | LCD 20×4 I2C insterface | 20×4 LCD with I2C or without I2C | 1 |
| 6 | Buzzer (Alaram) | 5v Active Buzzer Magnetic Long Continous Beep Ton | 1 |
| 7 | Switch | toggle 2way (3 pin) | 3 |
| 8 | Limit switch | 3 wire button with lever | 1 |
| 9 | Keypad | 3×4 Keypad | 1 |
| 10 | Push buttons | Micro switch | 2 |
| 11 | Adaptor or Charger | 12 Volt , 4.5A | 1 |
| 12 | Vero-Board | (Square) 24.5cm x 10cm | 2 |
| 13 | Single wire header (male/female) | 20cm M2M and M2F | 2+2 |
| 14 | Soldering Wire | 30/70 tin / lead alloy solder | 1 |
| 15 | Cpacitors | 0.1uf, 4.7uf, 47uf ,220uf | 50+10+10+10 |
| 16 | Resistors | Sheet | 3 |
| 17 | Transistor | 2n2222a , BD139 | 5+5 |
| 18 | Barrek Jack | rated 5Amp | 1 |
| 19 | Ferrit bead | 22uH/3A | 1 |
| 20 | Fuse with holder | 5Amp | 1 |
| 21 | Leds | Red , Green, Yellow | 5+5+5 |
| 22 | Soft wires roll | (Red , yellow,Black) | 1+1+1 |
| 23 | Shrink Sleeve | 2mm | 1 mtr |
| Soldering past | |||
| 24 | Crimp Connector | 16 Pin , with lock | 1 |
| Regulator IC | 7805 , 7812 | 2+2 | |
| 25 | Heat sinks for 7805,7812,BD139 | 3 | |
| 26 | Sensors | 1. Kavlico P1J (Digital I2C)
2. Flow Sensor SFM3200 3. EnviteC O2 Sensor OOM102 |
1 |
| 27 | Peep valve with diverters | 1 | |
| 28 | Test lung with circuit | 1 | |
| 29 | Ambu bag | 1 |
Join The Team
If you are an enthusiastic engineer, doctor or an industrialist, or a person who think can contribute or use this initiative to built ventilators.. for Pakistan or for any other country in the world.. we are ready to help in this time of crises.