tag:blogger.com,1999:blog-2217393939875576576.post1613700341910279650..comments2023-09-12T11:52:39.482-04:00Comments on Pandemic Ventilator Project: I'm backDreamerhttp://www.blogger.com/profile/13701195188549081875noreply@blogger.comBlogger43125tag:blogger.com,1999:blog-2217393939875576576.post-48499492955471309152020-05-07T09:03:57.187-04:002020-05-07T09:03:57.187-04:00Thanks for sharing such an informative post. To B...Thanks for sharing such an informative post. To <a href="http://bipapmachines.in/" rel="nofollow"> Buy Bipap machine online </a>, Medical Equipment Online at Best Prices from SSB Medicare Pvt Ltd in India. Top Quality with best price Health Equipments at your Doorstep. Order Now! <br />Visit: <br />Phone: +91 8400-600-800<br />ssb medicarehttps://www.blogger.com/profile/02225388935971655762noreply@blogger.comtag:blogger.com,1999:blog-2217393939875576576.post-456905791133984722020-03-16T11:30:51.859-04:002020-03-16T11:30:51.859-04:00Hello Mr. Strupat,
We have a great shortage of ve...Hello Mr. Strupat,<br /><br />We have a great shortage of ventilators in my Eastern European country - we have maybe 80 in total across the whole country, but almost certainly less. But we have some great engineers and some manufacturing capacity. I came across the CBC article on your version of the pandemic ventilator. Something like this, if we were to produce it here, could save hundreds or thousands of lives. Is there any way you could share the specs? Can I contact you directly somehow? <br /><br />Thank you and good health to you and yoursValdemarhttps://www.blogger.com/profile/05642084671702006729noreply@blogger.comtag:blogger.com,1999:blog-2217393939875576576.post-38652185081233910492020-03-16T10:14:22.376-04:002020-03-16T10:14:22.376-04:00A pandemoc machine has many patientcapacity &n... A pandemoc machine has many patientcapacity &nd is simple.Anonymoushttps://www.blogger.com/profile/08515733912167798826noreply@blogger.comtag:blogger.com,1999:blog-2217393939875576576.post-82451689304466024022020-03-15T15:04:59.358-04:002020-03-15T15:04:59.358-04:00It is all in how you ask the question. There once ...It is all in how you ask the question. There once was a nun who asked mother superior if it was Ok to smoke while praying. Mother Superior said no, it was not, you must devote all your efforts to praying. Another nun asked mother superior if it was okay to pray while she smoked. Of course said mother superior, you should pray every moment you can. Do not ask it if is OK to drop standards of care in a pandemic. Ask if it is OK to use every effort humanly possible to save the people that we do not have existing ventilator capacity for.Dreamerhttps://www.blogger.com/profile/13701195188549081875noreply@blogger.comtag:blogger.com,1999:blog-2217393939875576576.post-15480871968886622002020-03-15T13:49:46.783-04:002020-03-15T13:49:46.783-04:00Anyone know of medical doctors willing to appear o...Anyone know of medical doctors willing to appear on mainstream media to highlight the issue of worldwide ventilator shortage?<br /><br />I'm thinking Emerg Docs are ideal because their focus is on treatment of patients who are may not be admitted into the hospital or ICU.<br /><br />Someone open to stating that a pandemic ventilator must be proven to be safe and reliable safe to use but has value even with the most basic operating features.<br /><br />Yes, I'm talking about a "MEDICAL CHAMPION" <br /><br />John Strupat<br />CANADA<br /><br /> Anonymoushttps://www.blogger.com/profile/14783035762109866290noreply@blogger.comtag:blogger.com,1999:blog-2217393939875576576.post-57095774687244496482020-03-13T14:15:31.486-04:002020-03-13T14:15:31.486-04:00I appreciate your concern for your partner. There...I appreciate your concern for your partner. There is right now a large group of technologists and medical people working on solutions to the ventilator shortage. One of them may involve groups building them and providing them fro free to people that know how to use them. Liability concerns are a huge problem. Selling them is really not an option.Dreamerhttps://www.blogger.com/profile/13701195188549081875noreply@blogger.comtag:blogger.com,1999:blog-2217393939875576576.post-10661020253516398252020-03-12T22:03:25.242-04:002020-03-12T22:03:25.242-04:00How much for someone to make one for me. Older par...How much for someone to make one for me. Older partner with all sorts of health issues. Terrified they'll get it and need a ventilator.Anonymoushttps://www.blogger.com/profile/14795240156429396151noreply@blogger.comtag:blogger.com,1999:blog-2217393939875576576.post-18276701984580156002020-03-11T11:50:23.373-04:002020-03-11T11:50:23.373-04:00Here is a good repository of information on the M...Here is a good repository of information on the MIT Ventilator<br />https://github.com/nikaiser/openVentilatorDreamerhttps://www.blogger.com/profile/13701195188549081875noreply@blogger.comtag:blogger.com,1999:blog-2217393939875576576.post-32289126373671555722020-03-11T08:21:51.462-04:002020-03-11T08:21:51.462-04:00There's an open source project for ventilators...There's an open source project for ventilators here: https://app.jogl.io/project/121#about Please join us! We need your help.Alexander Jameshttps://www.blogger.com/profile/11871603300658265981noreply@blogger.comtag:blogger.com,1999:blog-2217393939875576576.post-46655731143614665722020-03-11T08:20:22.234-04:002020-03-11T08:20:22.234-04:00There's an open source project for ventilators...There's an open source project for ventilators here: https://app.jogl.io/project/221 Please join us. We need your help.Alexander Jameshttps://www.blogger.com/profile/11871603300658265981noreply@blogger.comtag:blogger.com,1999:blog-2217393939875576576.post-17981493729634312362020-03-11T02:51:13.078-04:002020-03-11T02:51:13.078-04:00We're creating an engineering group to help in...We're creating an engineering group to help in the event of a severe COVID-19 crisis.<br /><br />The idea is that a COVID-19 outbreak might produce demands that our medical system hasn't seen before. There may be shortages or special needs of medical equipment and other resources.<br /><br />Right now we have engineers, PhDs, and the owner of a devices manufacturing company, with a supply chain and offices in New York, Florida, and Taiwan. We probably can't build ICUs, but we could help a burdened medical front-line in a crisis. <br /><br />I'm posting because we are right now looking for doctors and nurses to get advice, particularly those with emergency room, triage experience.<br /><br />We're also looking for other help—people with experience in project management, engineering as well as non-technical leadership skills.<br /><br />If you're interested, please get in touch. My email is charles (at) mapproject.ai Charles Henoreply@blogger.comtag:blogger.com,1999:blog-2217393939875576576.post-39260068609704194262020-03-11T00:13:56.131-04:002020-03-11T00:13:56.131-04:00Hi @Dreamer. The MIT group had a follow-up thesis ...Hi @Dreamer. The MIT group had a follow-up thesis where they improved on their most published version: Powelson, Stephen K. (Stephen Kirby) https://dspace.mit.edu/handle/1721.1/59954.<br /><br />Thank you so much for the Baltimore Sun article.<br /><br />Someone said above that it is impossible to use PEEP valves with bellows. However, PEEP valves are commonly incorporated into BVMs. The issue is that an additional valve / outlet is needed to block airflow back into the bag.kopticshttp://reddit.com/u/kopticsnoreply@blogger.comtag:blogger.com,1999:blog-2217393939875576576.post-10967093427989881602020-03-07T12:34:35.361-05:002020-03-07T12:34:35.361-05:00ICU's will generally avoid using BIPAP in thes...ICU's will generally avoid using BIPAP in these patients since the outlet valve will shoot aerosols across the unit. They will go straight to paralyzing and intubating.Kashifnoreply@blogger.comtag:blogger.com,1999:blog-2217393939875576576.post-5478991308440313502020-03-06T14:33:20.607-05:002020-03-06T14:33:20.607-05:00Thats right. BiPap ventilators are generally inte...Thats right. BiPap ventilators are generally intended for use with a mask and so have lower pressures than the high pressure units used in critical care directly connected to an endotracheal tube to seal the airway. Other than the higher pressures and more extensive controls and monitoring they are very similar. The positive pressure ventilator will have a more powerful blower as well. That design is well documented in the link and offers a lot of insight into how to make one. Dreamerhttps://www.blogger.com/profile/09641484213260255701noreply@blogger.comtag:blogger.com,1999:blog-2217393939875576576.post-3118163691164453972020-03-06T14:01:17.393-05:002020-03-06T14:01:17.393-05:00You are correct, Clarence, but a high pressure blo...You are correct, Clarence, but a high pressure blower could be substituted for the one used used in a BiPAP device like this, right?<br /><br />I suggest everyone read the technical details of this commercial design (BiPAP Synchrony) to see their solutions to the challenges with a blower-based product. <br /><br />JohnAnonymoushttps://www.blogger.com/profile/14783035762109866290noreply@blogger.comtag:blogger.com,1999:blog-2217393939875576576.post-53404965792201253842020-03-03T11:19:33.898-05:002020-03-03T11:19:33.898-05:00Nice find and good information. That is very det...Nice find and good information. That is very detailed useful to get an idea of what is required for parts and design for systems using blowers. This is, however, for a BiPAP design. BiPAP shares some of the same design elements as a pressure control ventilator with PEEP capability but is on its own, not a suitable replacement for patients with serious lung injury.Dreamerhttps://www.blogger.com/profile/09641484213260255701noreply@blogger.comtag:blogger.com,1999:blog-2217393939875576576.post-36305944755258441752020-03-03T09:51:05.267-05:002020-03-03T09:51:05.267-05:00Lot's of technical information here with pictu...Lot's of technical information here with pictures and parts lists for a successful blower based ventilator from 2006: <br /><br /> https://www.hmebc.com/wp-content/uploads/Respironics-Synchrony-Bipap-Machine.pdfAnonymoushttps://www.blogger.com/profile/14783035762109866290noreply@blogger.comtag:blogger.com,1999:blog-2217393939875576576.post-67424874027994024592020-03-02T16:41:48.790-05:002020-03-02T16:41:48.790-05:00For Anyone looking for blowers, here are some more...For Anyone looking for blowers, here are some more choices:<br /><br />Here is a blower from Digikey<br />https://www.digikey.ca/products/en?keywords=BFN0724SS-01<br />Digi-Key Part Number 603-2239-ND <br />Manufacturer Delta Electronics <br />Manufacturer Part Number BFN0724SS-01<br />It has a Spec sheet with a performance curve<br />This is a 5KPa blower that will produce about 50 cm H2O static pressure<br />Looks very similar to the Micronel<br />US $153 <br />50 in stock<br /><br />Here is an 8 KPa blower from China, US $35<br />Unfortunately, it would probably take a long time to get here.<br />They have a spec sheet as well.<br />They also have a driver for it.<br />https://www.alibaba.com/product-detail/90mm-small-size-8kpa-high-pressure_62466669666.html?spm=a2700.7724857.normalList.9.5be843533CTBun&s=p<br />Dreamerhttps://www.blogger.com/profile/09641484213260255701noreply@blogger.comtag:blogger.com,1999:blog-2217393939875576576.post-54278359034531866202020-03-02T15:09:21.163-05:002020-03-02T15:09:21.163-05:00The Amazon blower can barely produce flow against ...The Amazon blower can barely produce flow against a few cm H20 but the Micronel part certainly has capability https://digitalcommons.usu.edu/cgi/viewcontent.cgi?referer=https://www.google.com/&httpsredir=1&article=1016&context=spacegrant<br /><br />Pressure support/pressure control or BiPAP (2 level) ventilation is still not sufficient for patients with stiff lungs who may need 50 cm H20 or more peak pressure.<br /><br />I don't see any info on the response time of the Micronel products so you might let it blow continuously with large diameter valves in the patient circuit to block and then dump pressure. Typical of early ventialtors from the 1970's and all electric CPAP products.Anonymoushttps://www.blogger.com/profile/14783035762109866290noreply@blogger.comtag:blogger.com,1999:blog-2217393939875576576.post-21441763947106138012020-03-02T11:53:31.839-05:002020-03-02T11:53:31.839-05:00Here is a nice summary of how pressure control ven...Here is a nice summary of how pressure control ventilation works.<br />https://www.merckmanuals.com/en-ca/professional/critical-care-medicine/respiratory-failure-and-mechanical-ventilation/overview-of-mechanical-ventilation<br /><br />They suggest a maximum peak airway pressure of 25 cm H2O.<br />If you bought the Amazon blower, you could easily create a performance graph similar to what is on the Micronel spec sheet for comparison. Another really important aspect is how quickly the blower can speed up or slow down. This depends somewhat on the design and capability of the electronic driver system and also is dependant on the mass of the blower impeller and motor rotating element.<br />Dreamerhttps://www.blogger.com/profile/09641484213260255701noreply@blogger.comtag:blogger.com,1999:blog-2217393939875576576.post-80952832329632192972020-03-02T11:20:23.204-05:002020-03-02T11:20:23.204-05:00Sorry those specs should be maximum 5000 Pascals, ...Sorry those specs should be maximum 5000 Pascals, maximum 450 liters per minute.<br />If you analyse the de-rating chart we get our 100 liters per minute at 4300 pascal (43 inches H2O)<br />Probably a Respiratory Therapist would be a better judge of whether this meets the bill than me.Dreamerhttps://www.blogger.com/profile/09641484213260255701noreply@blogger.comtag:blogger.com,1999:blog-2217393939875576576.post-72983736953364508522020-03-02T11:12:01.057-05:002020-03-02T11:12:01.057-05:00Here is a Swiss-made blower from Micronel:
https:/...Here is a Swiss-made blower from Micronel:<br />https://www.micronel.com/products/u-line/?tx_micronel_products%5Bserie%5D=14&tx_micronel_products%5Baction%5D=show&tx_micronel_products%5Bcontroller%5D=Serie&cHash=49b1d81100bb533e7093137d94da976d<br />They build for the medical industry. Unfortunately, it is highly unlikely they will sell you any units fro a DIY project.<br /><br />450 liter per minute at 5000 Pascal pressure (50 cm H2O)<br />3 Phase brushless DC motor 24V, 1.4A<br />Spec Sheet:<br />https://www.micronel.com/uploads/tx_micronel/U51DX-024KK-5_without_integrated_electronics_01.pdf<br />Dreamerhttps://www.blogger.com/profile/09641484213260255701noreply@blogger.comtag:blogger.com,1999:blog-2217393939875576576.post-17428840156613131262020-03-02T10:37:33.226-05:002020-03-02T10:37:33.226-05:00So what would we need for a fan? These are some (...So what would we need for a fan? These are some (very rough) back of the envelope calculations:<br />Assume we wanted to have the capability of providing 20 liters per minute to the patient. Now, these ventilators do not run the fan continuously. It is idle for most of the time and then runs at a very high flow rate and then shuts off right again. I think a brushless DC motor with a suitable drive would be a good choice. Let us assume a 20% on-time duty cycle. We would need an output of 100 liters per minute from our fan at whatever back pressure is being supplied by the lung. Most fans are flow rated at zero back pressure, so just to be sure we have enough capacity, let us put in a 10 times overspec. That would be 1000 liters per minute.<br /><br />Here on Amazon, for less than $20 is a brushless 12V DC centrifugal fan rated for 38.5 cubit feet per minute. That is 1,089 liters per minute.<br /><br />Wathai Brushless Cooling Blower Fan 120mm x 32mm 12V DC Centrifugal Fan High Airflow<br />by Wathai<br /><br />https://www.amazon.com/Wathai-Brushless-Cooling-Centrifugal-Airflow/dp/B07RMJC9NT/ref=pd_sbs_147_6/135-2188738-0675322?_encoding=UTF8&pd_rd_i=B07RMJC9NT&pd_rd_r=30fb7d06-ace3-4d7a-b915-70b8f6c5261b&pd_rd_w=7nIW1&pd_rd_wg=Y6EOf&pf_rd_p=7cd8f929-4345-4bf2-a554-7d7588b3dd5f&pf_rd_r=CM2AKENEYHNPZA23KHB6&psc=1&refRID=CM2AKENEYHNPZA23KHB6<br /><br /><br />Dreamerhttps://www.blogger.com/profile/09641484213260255701noreply@blogger.comtag:blogger.com,1999:blog-2217393939875576576.post-52269677843618793012020-03-02T08:27:45.026-05:002020-03-02T08:27:45.026-05:00Thanks for the reply.
>extremely high RPM turb...Thanks for the reply.<br /><br />>extremely high RPM turbine blowers to generate high flow at high pressure. Driven by electric motors that can stop, start and adjust flow in milliseconds.<br /><br />Are suitable high RPM turbine blowers only used in this medical area or are they used elsewhere?<br /><br />> A flow sensor is mandatory for measuring the flow into the patient and to calculate the Tidal Volume (Vt).<br /><br />Flow sensors seem to be relatively easy to get. I am not sure if they are in the tolerances needed here.<br /><br /><br />Iamreddavehttps://www.blogger.com/profile/02768287658329807075noreply@blogger.comtag:blogger.com,1999:blog-2217393939875576576.post-69521443999720337612020-03-01T16:51:53.314-05:002020-03-01T16:51:53.314-05:00Hello John,
I'm gathering maker/diy solutions ...Hello John,<br />I'm gathering maker/diy solutions here: I hope it can be somehow useful <br /><br />https://www.notion.so/imagemmental/c4af6b72b11142448ecac082174a86e2?v=2a0bf15d99b240c7ae3afd301dee05faJoão Rochahttps://www.blogger.com/profile/10019587496071159569noreply@blogger.com