OpenVent-Bristol COVID-19 ventilator rapid manufacture BVM bag valve mask ambu bag £80 build
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- Опубликовано: 30 мар 2020
- Please see a more recent version of my design in this video: • OpenVent Bristol V2.0 ...
and the published design here: www.instructables.com/id/Open...
openventbristol.co.uk/
The USP of this design is how easy and fast it can scale for mass production for the following reasons:
- Automated production: The production of each part is fully automated (laser cutting), with only 8 different parts
- Only 6 off-the-shelf components: Very few different components are needed and no exotic parts are needed (not even a motor coupling)
- Simple mechanism: It uses a super simple mechanism with just an arm mounted to a motor - no complicated mechanisms to go wrong, just one moving part
- Fast assembly: Complete assembly is possible in around 20 min with one person
- Adjustable settings: Has full adjustment of breath frequency and pressure/tidal volume and with a small adaption can function within all NHS requirements
- Low cost
The design is open source and a build guide is available on Instructables: www.instructables.com/id/COVI...
This design doesn't currently meet the NHS requirements (in link below). A list of improvements for the next version with the aim of meeting the spec is kept in the GitHub readme (link below), some of those things are here:
- A 12V battery backup with at least 20 min run time
- A battery management circuit to automatically switch over to the battery in a power cut (not actually required but would seem sensible)
- A pressure sensor alarm for sensing failure and a buzzer & LED to create an alarm on failure
- An LCD screen to show pressure and other values and Settings
GitHub code link: github.com/RealFreshRate/Open...
NHS Rapidly manufactured ventilator system specification: www.gov.uk/government/publica...
Leave a comment if you think there is anything else this will need before it could be safely adopted, particularly if you have experience using existing ventilators.
Disclaimer:
All users of this design and device shall be deemed notified of the warnings stated herein. This device is a simply designed, fast produced ventilator. This device should not be used in place of an existing hospital ventilator. These should only be used as a last resort where a patient has no other alternative due to the lack of availability of existing ventilators. This is not a fully medically certified device and should not be relied upon as such. The device is designed for use by trained medical professionals and should only be used by trained medical professionals; it is not intended for home use. The designers and manufacturers of this device shall not be held liable for any death or injury that may result from this device.
The designers and manufacturers of this device give no guarantees or warranties as to the efficacy and/or safety of this device.
This design isn't connected with dyson or any other ventilator projects including Dyson CoVent.
I like it.
It's one of the greatest designs I've ever seen!
Good job Darren :)
Terrific start! We are creating one utilizing electric cylinders but Ive always been partial to your mechanical movement. Very nice job. Looks great!
DE VARIAS ALTERNATIVAS QUE HE VISTO, QUE CONSIDERO QUE ESTE ES EL MAS VIABLE, EXCELENTE.
Wow, thanks for sharing this concept. Excellent!
Gracias por contribuir con este gestó humanitario para el bienestar de la salud. Éxitos en tus proyectos.
That's great Darwen....
Love from India ❤️
Great approach.clean design.
Good job and just easy to treat noise issue
This is the way!!! congratulations !!!!
Amazing! I'll be sharing!
Well done mate.
Great job friend !!!!
Great Design
Great work!
Congratulations darren
Great work!!
looks perfect!
Well done. Now a little more of effort trying to make it more quiet, the sick one will be needing to rest. Congrats!
Thank you for your work. But, this is just a hand protection for the Ambu bag. To ventilate people with pneumonia, you need a more delicate work of the respirator, different type of air supply, Peep. I'm not talking about monitoring ventilation - it is necessary if the patient is ventilated for many days. In addition, you need a good humidification of the air mixture.
Nikulin Alex do you have any actual stats you can share. There are people dying because of the lack of available ventilators. I know it will not replace a $30,000 unit, but it it saves a single life, is it not worth it?
Pulmonologist doctors requires AC mode or assist mode in this type of low cost ventilators wherein it has respond with the breath of the covid patient. There should be a trigger signal from the patient otherwise the rhythm of the breath will not be in sync and may cause further health issues. We made one already and this is our problem now.
Thanks for your message. I plan to create an assistive mode soon. Interesting that you have done this already, do you have any details of your project that I can view? The problem I have with creating an assistive breathing mode is that there is no test for measuring the success of it in the MHRA document
Your real good men...
good job bro
thank you sir
Hi all, please see the latest version of my design in this video: ruclips.net/video/RIKmd1mEYg4/видео.html
and the published design here: www.instructables.com/id/OpenVent-Bristol-V20-COVID-19-Rapid-Manufacture-Ve/
Hi, kindly recommend, Fail-Safe operation - If the machine fails, a clinician must be able to immediately shut down, open the device manually, remove the bag and convert to manual bagging.
JOHAN PINZON PARDO exactly, the ones I have seen (that are going for full approval) have bio feedback systems and dual control systems built in. Any failure of the control circuit, a simple switch changes over to a new duplicate circuit in less than a second, the faulty circuit can be replaced with zero interruption of operation.
Hi Darren. You have definitely done your research. The peep valve is an excellent idea and I like how your motor assembly is attached to the housing. I am working a system that would ideally work with your system to trigger the ventilator based on an assist control mode. That would reduce the risk of barotrauma. Great work!
Sachit Wijesinghe how did you get on? Can you post your progress? Have you seen our 2nd design with pressure and flow sensing? ruclips.net/video/RIKmd1mEYg4/видео.html
Great development, Darren! It is designed in the simple way so people can re-produce it, which is very critical for that purpose. If you allow me, I would suggest you to attache a potentiometer to the geared motor shaft as shaft angle sensor so you can better control the airflow. Your control system looks a bit complicated; you could suggest is based on H-bridge (which is relatively simple and people may find H-bridge chip in their local component stores), and all your control knobs/potentiometers directly connected to arduino. This way more people can re-produce the ventilator. Keep this good job up! I wish you great success! P.S. one more question: how are you going to modify it to connect your pressure module?
Thanks for sharing your idea. I did think about the POT Vs the current sensor, but went for the current sensor in the end to save on extra mechanical parts and seeing as the current sensor is included in the standard motor driver shield. I am planning to include a pressure sensor to maintain the correct pressure and sense failure.
Nice
Hi, have you tried the design with a test lung? Generally you'll get more load on the motor hence proportional increase in current depending on load increase. This may change the calibration of settings in your code. Also'll need a pressure safety release valve.
datta naik thabks for your comment. I am using a test lung of sort (I can’t get access to a proper test lung so I’m using the expansion balloon from a waters circuit). Over pressure valves which are compatible with BVMs already exist, so it should just be a case to add one of those I think
I am fairly sure that you are considering a cutout (if needed a gate) such that you just drop in the Bag and also quickly remove it for manual handling ...rather than fiddle it in ... just saying .
Very nice work so far. Cheers bro.
Neville Rodrigues thanks. Have you seen our second design? ruclips.net/video/RIKmd1mEYg4/видео.html
@@00lewisd1 Thanks for the update ... I love your new design
Great!!! Look this other solution.
ruclips.net/video/RVOna8jlPG0/видео.html
please, the caractéristiques of the motors! power, bending?
Great
it is the greatest designs i've ever seen,,,
Can I get circuit diagram of it or simulation..how to connect it..please please help
I do have one question regarding your ventilator. Does it have the ability to adjust the Inspiration Expiration Ration (IE ratio)?
Yes, this is in the more recent video: ruclips.net/video/RIKmd1mEYg4/видео.html
@@00lewisd1Hey can you read my comment?
Can anybody help me with the breathing circuit complications and the ISO standards implementation for the bio-compatibility.
good work.
can i replace the dc motor with a stepper motor
Hakim Sahour unfortunately no, not in this design, a stepper is unlikely to have the stall power required
Hey, so I was remaking this machine and I came across an issue with the motor arm. When it presses down on the BVM Bag it doesn’t come back up properly. The motor will just continue to press down on the bag. I am using a acyclic motor arm but I think it’s something else that’s giving it an issue. I would love to get some help on troubleshooting this problem. Have a great day and thanks in advance.
What are the specs of the pressure sensor you are going to use?
Mamadou Bobo Diallo it’s the MPX5010 differential sensor. Tops out at 10kPa
Todo las ideas buenas. Malo es que nunca se usaron.ni para emergencia.
Which card is this card's name, I want to know its full function
Under rated video, thanks for the info. Hope you haven't used it yet!
Jeez Karen chill out he’s trying to save live not end them
Is there an update available?
You have talked about extra features, did these get added?
Tony Bickley aiming to have another video out over the weekend
Darren Lewis Fantastic, I will look out for it, hopefully the subscribe notification will work 🤞
Dear Darren, I couldn't find the DJ Shield anywhere in my city.
Is there any alternative !
Can I use normal potentiometers or controllers instead of the DJ Shield ?
Please please help me. I will be extremely grateful for your help 💙💙💙💙💙
KÄISER yes you can use normal buttons and potentiometers as long as you wire them to the same pins
@@00lewisd1
Thank you bro Darren for your response. You're really great. 💙
I have the worst luck in the world 😑 .. I ordered a DC motor like yours, but a stepper motor was sent to me ..! I do not know how to program it !
Can I find a code for stepper motor ?
Please bro Darren, help me 😓💙
I spent a lot of money, I want to succeed in my project. I hope that you will help me Mr. Darren.💙
Can I get circuit diagram of it or how to arrange component and wiring diagram please I need it fast ??
pallela Namratha please find this via our website for our new design. Let me know if I can help with anything else openventbristol.co.uk
Where you get electronic control board??
what abt tidal volume/ rr/ pi monitoring
milind soparkar this is available in our second design: ruclips.net/video/RIKmd1mEYg4/видео.html
Appreciate your excellent no-frills design, which is what is needed at the moment for a low cost model. Couple of questions- since your geared motor seems to be working open loop- in one direction you limit it by sensing the current flow through the motor. How is it returning back to the start position without feedback? Secondly how did you select this geared motor, any particular parameters relating to the torque or compression needed in this application; also what is the probably lifetime of this motor, especially if its put into strenuous use at say 30 compressions per minute?
capo!!!
👍
Sounds like the MIT ventilator project with Arduino...
hi man fist of all i should great idea
i from afghanistaan we nedd this dvice my qauestion is that how to make the frequency and preasure controler
i have the motor but i dont know how make the handle please please please tell me how i can made
thanks
Please see design guide in this link: www.instructables.com/id/COVID-19-Rapid-Manufacture-Ventilator-BVM-Ambubag-/
Dharren what is the purpose of while balloon at the end of flexibile vessel?
Does it support PEEP?
Petrus Sutyasadi yes it does. Please see our second design: ruclips.net/video/RIKmd1mEYg4/видео.html
Hey, so nice project. Would you like to get a sponsor about this video?
NextPCB yes I’m very interested in your offer. Please can you message me via my website to discuss? Very sorry for the delay in responding, I have been very busy with the next design, please see here: openventbristol.co.uk
Which specific motor does it use??
Mari Angulo it’s from the 942D series from como with the 500:1 gearbox
Is this project accurate and calibrated and approved by FDA?
vicente sibal jr it’s not FDA approved and this is only the first design so doesn’t produce accurate results. Please see the latest version which has better performance, this was tested using a test lung: ruclips.net/video/RIKmd1mEYg4/видео.html
Can I get the circuit diagram please ?
please check the instructables link
Wonderful - but big companies will never like it .
Hi there. Congratulations. Well done. I hope you can also figured out give us idea about how to attach a monitor and sensors to give us information about dependent variables like Peak pressure, platue pres., Alarm for leak. Etc.
Can you share your email with me?
Mohammed Yousuf these functions are included in our second version here, we are working on a 3rd version as well ruclips.net/video/RIKmd1mEYg4/видео.html
Love it but its not a DIY solution. DIY is bits of plywood, 2 x1's , windscreen wiper motor and a cheap and cheerful 12 volt Ac/dc transformer and variable speed adjuster . All cheap and cheerful off Ebay . Other than that I love it !!
JK. SEP it’s safety, reliable compliance with the requirements and low chances of FDA approval that I would be concerned about there. (I’m certainly not suggesting that my design is safe yet, we’re still working on it)
@@00lewisd1 Yes I do understand that Darren. Your trying to make a serious contribution.
I'll be posting mine in the next day or so . I am just waiting for something to arrive off eBay and then I'll put it up and give you the link to make comments.
Eso no es un ventilador ni de chiste
Nice