Make some face shields for NHS workers

amcewen commented 4 years ago

Spinning this out of Alex's comment and this epic multi-branched Twitter conversation this evening, it seems that (at least starting or preparing for) spinning up some manufacturing of face shields is a useful thing we could do to help with the covid-19 pandemic.

Design considerations

The ones we are using are a trip of foam glued to a clear sheet with elastic to hold it on. They are supposed to be single use.
Ideally should fit with other parts of a uniform or alone to protect against splatter/ spray with room for headwear, mask & glasses/goggles. Should be secure around head/adjustable Here's a photo of current(?) solutions and the uniform, etc.
Foam design is very similar to what we are currently using in ED. We have brief contact times with patients & get through lots. Other areas e.g. ICU may need something more resilient
On sterilisation/cleaning: Should be single use. Might be worth contacting Primary care groups as GPs have no PPE at present so can't see patients many of whom could stay at home / face shields should be able to be decontaminated between patients with bleach- we use acticlor solution in our trust and it's deemed to be good for viral contamination. I think risk of transmission to HCP low and risk of cross contamination 2 next pt lower / If they're not disposable then they should be easy to clean. I don't know how foam will fare. Depends on where they're being used: everyday outpatients/GP surgery/ pharmacies are different from intensive care units and high infection wards.
To be honest I think that foam head band would be better than the large gap at the top of this one. It is droplet spread so a sneeze or cough while swabbing would go straight through that space :sneezing_face:

Materials notes

Other info, links, etc.

Covid-19 UK collaboration slack

We're also trying to find some links to local primary care groups and hospitals, to work out what's useful for them.

Please update/add to this description as we work things out.

amcewen commented 4 years ago

I think @ajlennon and I are going to work on a bit of a prototype to try things out tomorrow. Remote attendees welcome :-) Seems like @KarlDunkerley might be poking at it at home too.

ajlennon commented 4 years ago

Fantastic curation thanks to @amcewen.

Couple of other bits that came up

I've been speaking with some chaps in Lancaster:

"I would take direction from any medical folks as they need to take decisions on lowering their safety requirements (i.e. not CE marked). We've been working locally with folks in Lancaster and Morecambe however you would be under these guys - https://www.liverpoolccg.nhs.uk/ "

So I Googled around and have reached out to

Not heard back.

I have also heard that Liverpool Uni Additive Labs may be looking at aspects of what can be done to assist the NHS. I have reached out to Dr Kate Black to ask if the #Maker community in Liverpool can offer any assistance.

A side discussion was that people are saying there is PPE equipment but it's in the wrong place. If this is so then why isn't it being moved to the right place and is there a way for us to assist. I will happily rent a van and drive around if this would get PPE to doctors on the front line. #NeedsInvestigation

Lastly if we find we can contribute to rapid manufacture of PPE masks for the local NHS (presumably as part of a wider national/global effort) then where do we source materials and who pays for them?

I am assuming this is a case of the faster we can manufacture, the more materials and the bigger the crowd the better #scaleability.

ajlennon commented 4 years ago

Can do. What time we thinking @amcewen ?

amcewen commented 4 years ago

Any time after 12 would be good for me. Have you got any empty (or emptyable) 2 or 3L coke bottles you could bring as a source of PETG? I think they'd need to not be ribbed to be easily laserable. Otherwise we'll need to raid Lidl.

ajlennon commented 4 years ago

OK. Post 12. Will buzz you when I'm setting off. Don't drink coke I'm afraid. I wonder who might ? Will think.

ajlennon commented 4 years ago

Some more background on needed PPE and much more at the Internet Book of Critical Care (IBCC). Apparently continually being updated.

gear (1) Contact precautions (waterproof gown and gloves) (2) Some sort of mask (discussed above in the transmission section) N95 mask or a powered, air-purifying respiratory (“PAPR”) Surgical mask for patients not undergoing aerosol-generating procedures (based on WHO & Canadian guidelines). An anesthesia mask might be placed in-line with a viral filter to MacGyver an N95 mask (see video below). The main drawback is that the mask itself could become a giant fomite which is contaminated with COVID-19 (so carefully washing the entire mask in between uses). (3) Goggles or eye shield. (4) Hair cover for aerosol generating procedures (listed above in red text). (5) Hood may be used, especially during intubations (this can be constructed out of a trash-bag, as shown in the tweet above). Shoes Shoe covers aren't recommended, as removing them may increase exposure (ANZICS guidelines). Shoes that are easily cleaned and don't need to be touched might be preferable (e.g. Danskos). Note: The exact gear used is probably less important than using it correctly.

ref: Internet Book of Critical Care - COVID19

Hat tip to the Astral Ship

KarlDunkerley commented 4 years ago

I am. Does anyone know where to get rolls of double-sided velcro? Am thinking of putting slits at the top left and right and threading this through to make shield more adjustable and quicker to assemble. No stapling required. Thoughts anyone? May raid local homebase or range if still open. If anyone comes across any then please let me know.

On Tuesday, 24 March 2020, 23:19:06 GMT, Adrian McEwen <notifications@github.com> wrote:

I think @ajlennon and I are going to work on a bit of a prototype to try things out tomorrow. Remote attendees welcome :-) Seems like @KarlDunkerley might be poking at it at home too.

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RussCoty commented 4 years ago

Would Velcro be a “germ trap”?

Also just a thought, as a kid my dad used to get us animation cell from work, it might have been Overhead projector film. It was in A4 sheet and sometimes had alignment holes/notches at the top.

KarlDunkerley commented 4 years ago

We'd need advice from clinicians but this is the sort of thing I was thinking of...

Velcro® Brand Velcro One-wrap Reusable Ties 30mm x 5m Black | Zoro UK


£6.79

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Velcro® Brand Velcro One-wrap Reusable Ties 30mm x 5m Black	Zoro UK

Velcro® Brand - Velcro One-wrap Reusable Ties 30mm x 5m Black available at www.zoro.co.uk - UK's Leading Supplie... |

|

It has loops on one side and hooks on the other. V easy to thread through a slot on either side. Foam could also be velcrroed on to mask so that it could be swapped out if it gets dirty.

Random thoughts. Karl

On Wednesday, 25 March 2020, 08:27:38 GMT, RussCoty <notifications@github.com> wrote:

Would Velcro be a “germ trap”?

Also just a thought, as a kid my dad used to get us animation cell from work, it might have been Overhead projector film. It was in A4 sheet and sometimes had alignment holes/notches at the top.

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JackiePease commented 4 years ago

Mentioned this simple design to Alex and Adrian - it uses an acetate sheet with a 4 hole punch:

https://twitter.com/3d_maranon/status/1242177410759524355?s=09

I don't think we've got double sided Velcro - if anyone has any use for single sided we've got lots of that (in the fabric cupboard I think).

From: RussCoty notifications@github.com Sent: Wednesday, March 25, 2020 8:27:38 AM To: DoESLiverpool/somebody-should somebody-should@noreply.github.com Cc: Subscribed subscribed@noreply.github.com Subject: Re: [DoESLiverpool/somebody-should] Make some face shields for NHS workers (#1415)

Would Velcro be a “germ trap”?

Also just a thought, as a kid my dad used to get us animation cell from work, it might have been Overhead projector film. It was in A4 sheet and sometimes had alignment holes/notches at the top.

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RussCoty commented 4 years ago

Laser cutting seems like the answer for high volume, but I feel like it’s best to get a specific agreement with whoever needs the stuff. Could this be solving a problem that doesn’t exist?

amcewen commented 4 years ago

@RussCoty good point to raise, but most of the Tweets I linked to in the description are from doctors/NHS staff, so there's at least some demand. Finding people to talk to locally to work out demand (or if there's more important stuff to be tackling) is key though.

Hopefully by the time we get to have such a conversation we'll at least have a better idea of what we can offer though, and maybe a prototype to show them.

KarlDunkerley commented 4 years ago

Is it the stick on or sew-on type velcro and in a roll or a sheet? On Wednesday, 25 March 2020, 08:41:31 GMT, Jackie Pease notifications@github.com wrote:

Mentioned this simple design to Alex and Adrian - it uses an acetate sheet with a 4 hole punch:

https://twitter.com/3d_maranon/status/1242177410759524355?s=09

I don't think we've got double sided Velcro - if anyone has any use for single sided we've got lots of that (in the fabric cupboard I think).

From: RussCoty notifications@github.com Sent: Wednesday, March 25, 2020 8:27:38 AM To: DoESLiverpool/somebody-should somebody-should@noreply.github.com Cc: Subscribed subscribed@noreply.github.com Subject: Re: [DoESLiverpool/somebody-should] Make some face shields for NHS workers (#1415)

Would Velcro be a “germ trap”?

Also just a thought, as a kid my dad used to get us animation cell from work, it might have been Overhead projector film. It was in A4 sheet and sometimes had alignment holes/notches at the top.

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JackiePease commented 4 years ago

Not sure - maybe some of both

From: KarlDunkerley notifications@github.com Sent: Wednesday, March 25, 2020 9:58:34 AM To: DoESLiverpool/somebody-should somebody-should@noreply.github.com Cc: Jackie Pease jackiepease@hotmail.com; Comment comment@noreply.github.com Subject: Re: [DoESLiverpool/somebody-should] Make some face shields for NHS workers (#1415)

Is it the stick on or sew-on type velcro and in a roll or a sheet? On Wednesday, 25 March 2020, 08:41:31 GMT, Jackie Pease notifications@github.com wrote:

Mentioned this simple design to Alex and Adrian - it uses an acetate sheet with a 4 hole punch:

https://twitter.com/3d_maranon/status/1242177410759524355?s=09

I don't think we've got double sided Velcro - if anyone has any use for single sided we've got lots of that (in the fabric cupboard I think).

From: RussCoty notifications@github.com Sent: Wednesday, March 25, 2020 8:27:38 AM To: DoESLiverpool/somebody-should somebody-should@noreply.github.com Cc: Subscribed subscribed@noreply.github.com Subject: Re: [DoESLiverpool/somebody-should] Make some face shields for NHS workers (#1415)

Would Velcro be a “germ trap”?

Also just a thought, as a kid my dad used to get us animation cell from work, it might have been Overhead projector film. It was in A4 sheet and sometimes had alignment holes/notches at the top.

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KarlDunkerley commented 4 years ago

You've given me a tought. I have some printable clear transparency sheets for inkjets. They are flexible but not ridiculously so. Only slight issue is that the printable surface is very slightly hazy. This sort of thing... OfficeTree Overhead Projector Film - 50 Acetate Sheets A4 -Transparent - Laser - 692624403116 | eBay


£20.34

|

OfficeTree Overhead Projector Film - 50 Acetate Sheets A4 -Transparent -...

Click here to see description. |

|

But mine is A3.

On Wednesday, 25 March 2020, 08:27:38 GMT, RussCoty <notifications@github.com> wrote:

Would Velcro be a “germ trap”?

Also just a thought, as a kid my dad used to get us animation cell from work, it might have been Overhead projector film. It was in A4 sheet and sometimes had alignment holes/notches at the top.

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KarlDunkerley commented 4 years ago

My mate in packaging has suggested this firm for PETG. Have emailed them requesting help. PET | Plastic Products Limited

|



PET	Plastic Products Limited

PPL offers an extensive range of BOPET films for a wide range of applications in addition to APET for box making... |

|

Cheers,

On Wednesday, 25 March 2020, 10:00:09 GMT, Jackie Pease <notifications@github.com> wrote:

Not sure - maybe some of both

From: KarlDunkerley notifications@github.com Sent: Wednesday, March 25, 2020 9:58:34 AM To: DoESLiverpool/somebody-should somebody-should@noreply.github.com Cc: Jackie Pease jackiepease@hotmail.com; Comment comment@noreply.github.com Subject: Re: [DoESLiverpool/somebody-should] Make some face shields for NHS workers (#1415)

Is it the stick on or sew-on type velcro and in a roll or a sheet? On Wednesday, 25 March 2020, 08:41:31 GMT, Jackie Pease notifications@github.com wrote:

Mentioned this simple design to Alex and Adrian - it uses an acetate sheet with a 4 hole punch:

https://twitter.com/3d_maranon/status/1242177410759524355?s=09

I don't think we've got double sided Velcro - if anyone has any use for single sided we've got lots of that (in the fabric cupboard I think).

From: RussCoty notifications@github.com Sent: Wednesday, March 25, 2020 8:27:38 AM To: DoESLiverpool/somebody-should somebody-should@noreply.github.com Cc: Subscribed subscribed@noreply.github.com Subject: Re: [DoESLiverpool/somebody-should] Make some face shields for NHS workers (#1415)

Would Velcro be a “germ trap”?

Also just a thought, as a kid my dad used to get us animation cell from work, it might have been Overhead projector film. It was in A4 sheet and sometimes had alignment holes/notches at the top.

— You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHubhttps://github.com/DoESLiverpool/somebody-should/issues/1415#issuecomment-603706957, or unsubscribehttps://github.com/notifications/unsubscribe-auth/ADBVRUGZUJGAP5GPRMI4X2DRJG57VANCNFSM4LTBRG3A.

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ajlennon commented 4 years ago

This looks to be the kind of thing

https://twitter.com/pieteriow/status/1242444947208486912?s=21

KarlDunkerley commented 4 years ago

Managed to pick up two rolls of this plus some sticky back velcro from Homebase. 20 min wait to get into store. Will have a go tonight after work. On Wednesday, 25 March 2020, 11:27:45 GMT, Alex Lennon notifications@github.com wrote:

This looks to be the kind of thing

https://twitter.com/pieteriow/status/1242444947208486912?s=21

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amcewen commented 4 years ago

Running a test print of a 3D printed design in use in Spain that @jackie1050 found, alongside the other experiments this afternoon.

KarlDunkerley commented 4 years ago

Anyone got any samples of the flexible clear plastic that's laserable.

On Wednesday, 25 March 2020, 14:23:31 GMT, Adrian McEwen <notifications@github.com> wrote:

Running a test print of a 3D printed design in use in Spain that @jackie1050 found, alongside the other experiments this afternoon.

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ajlennon commented 4 years ago

Question from Liam at Astral

guy at hospital here is very keen to get a price for face shield asap. he assures me hospital management have no better idea that he does about where theyre gonna get them from.

amcewen commented 4 years ago

I've got one sheet of mylar (mostly clear), could do with finding some more and/or a source of clear PET or PETG sheet. It'd be good to work out how thick/flexible the proper face shields' clear visors are.

Current stash of stuff to try using - https://twitter.com/amcewen/status/1242826238630248449

KarlDunkerley commented 4 years ago

Contacted one firm who do 2mm PETG but they reckon it is too stiff to bend. I'm working on less than 1mm. My workshop face shield is 0.7mm according to micrometer.

On Wednesday, 25 March 2020, 15:03:00 GMT, Adrian McEwen <notifications@github.com> wrote:

I've got one sheet of mylar (mostly clear), could do with finding some more and/or a source of clear PET or PETG sheet. It'd be good to work out how thick/flexible the proper face shields' clear visors are.

Current stash of stuff to try using - https://twitter.com/amcewen/status/1242826238630248449

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KarlDunkerley commented 4 years ago

Someone on a laser forum replied to my post and suggested this company in leeds. http://ppb.uk.com/Catalogue/petg-apet-antiglare-apet/petg-gloss-clear-pe-filmed-both-sides/700-micron-clear-petg

Have emailed them and awaiting response. Cheers. On Wednesday, 25 March 2020, 15:03:00 GMT, Adrian McEwen notifications@github.com wrote:

I've got one sheet of mylar (mostly clear), could do with finding some more and/or a source of clear PET or PETG sheet. It'd be good to work out how thick/flexible the proper face shields' clear visors are.

Current stash of stuff to try using - https://twitter.com/amcewen/status/1242826238630248449

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KarlDunkerley commented 4 years ago

Has anyone seen this info? https://pwp.gatech.edu/rapid-response/face-shields/

Very interesting. On Wednesday, 25 March 2020, 15:03:00 GMT, Adrian McEwen notifications@github.com wrote:

I've got one sheet of mylar (mostly clear), could do with finding some more and/or a source of clear PET or PETG sheet. It'd be good to work out how thick/flexible the proper face shields' clear visors are.

Current stash of stuff to try using - https://twitter.com/amcewen/status/1242826238630248449

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ajlennon commented 4 years ago

Has anyone seen this info?

Can be laser cut. Excellent. Needs investigation

KarlDunkerley commented 4 years ago

https://l.facebook.com/l.php?u=https%3A%2F%2Fwww.prusaprinters.org%2Fprints%2F25857-prusa-protective-face-shield-rc2%2Ffiles%3Ffbclid%3DIwAR1N3Bopha12MQg79AK7p93T9jcmxr80VC5J_jmrJPooTfpB5-Z8IWLEMv0&h=AT1U0o9O1_FSf2jApc9-wlIoOmc_vUh-SzuJfI2tao3xL1FlmJnq9xdMYMC94tCGEpKnOKWpzmEAPqe143CSOU9To-lx0ukFGiJ2DPPgxQuuX25697ta-34bsJiwL2qzc9eH5g

More ideas... On Wednesday, 25 March 2020, 17:45:06 GMT, Alex Lennon notifications@github.com wrote:

Has anyone seen this info?

Can be laser cut. Excellent. Needs investigation

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KarlDunkerley commented 4 years ago

First prototype....It smells a bit!

About 10 mins max to cut and make but that was with OHP film not PETG. Can get two visors on A3 sheet. The foam is from Halfords floor tiles and the velcro was a mix of sticky (for the replaceable forehead band) and the Reusable Tie Velcro for the adjustable straps.

Thoughts everyone?

On Wednesday, 25 March 2020, 17:45:06 GMT, Alex Lennon <notifications@github.com> wrote:

Has anyone seen this info?

Can be laser cut. Excellent. Needs investigation

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KarlDunkerley commented 4 years ago

Instructions;

Items Needed(For prototype) Sheets of OHP INKjet Printable film (Prototype only) for visor [PETG possibly for prodn version]EG https://www.ebay.co.uk/itm/100-x-OHP-sheets-for-Overhead-Projector-100-micron-Transparent-Printable-A3-A4/123949546417?var=424740269322&hash=item1cdbf7fbb1:m:mRHTIRuGJND2oGowlTrf9xA EVA Foam for forehead bandeg https://www.halfords.com/tools/garage-equipment/garage-essentials/rolson-6-piece-floor-mat-set---120-x-180cm-552101.html Reusable velcro for adjustable side strapsEg VELCRO® Brand ONE-WRAP® Reusable Ties 30mm x 5m - Blackhttps://www.homebase.co.uk/velcro-brand-one-wrap-reusable-ties-30mm-x-5m-black_p210085 Stick on Velcro to attach Forehead foamEg VELCRO Stick On Tape 20mm x 2.5mhttps://www.homebase.co.uk/velcro-stick-on-tape-20mm-x-2-5m-_p510701

Step 1 Download files Visor.dxf and Forehead.dxf (or Lightburn equivalents)

Step 2 Experiment with your laser settings to cut visor. Designed to fit one on A4 or two on A3. Dimensions are 290mm x 205mm

Step 3 Experiment with your laser settings to cut foam cleanly. Dimensions are 25mm x 195mm Can cut lots from single sheet of foam.

Step 4 Cut VELCRO Stick On Tape to just less than foam. Pull of paper and attach both together to Foam. Carefully place faom equidistant to the two strap slits.

Step 5 Cut a piece of the Reusable Velcro about 26cm long (or more for big heads LOL) Feed Reusable Velcro through one slit with loop/furry side towards visor (smoother on bonce) You need to double the strap back on itself so that it sticks to itself. This holds the strap in place. You may have to experiment as difficult to explain.

Step 6 Do the same on the other side.

Step 7 Et Voila.

On Wednesday, 25 March 2020, 17:45:06 GMT, Alex Lennon <notifications@github.com> wrote:

Has anyone seen this info?

Can be laser cut. Excellent. Needs investigation

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markmellors commented 4 years ago

Hi, I was pointed here by Alex, on Twitter. I've been trying to get my head around visor requirements over the last week. Here's what I've picked up so far: I think this is the best description of the requirements: https://docs.google.com/document/d/15k20PMe14_XQa-8kTA2G7nSIrF1bGSpc90_GM9H8yNI/edit I know that's US centric, but it matches up well with the product that a UK hospital (Addenbrookes) told me they were using. I think elastic is prefered over velcro, for one handed operation I think a foam pad is preferred for comfort, over a 3d print, and it also serves as a brow sheild. I agree with what you've said above about sterilisation and disposablity. I'm still waiting to hear back about how possible sterilisation is and why they don't currently do it. I've bought some 0.5mm PET sheet (8x4'!) to start with, about £10/sheet, bayplastics.co.uk, so not really worth faffing with pop bottles. I think thinner is better/cheaper, if it can be sourced. 0.18mm is what's used in the delve design. I haven't found a low volume source yet.

My current estimate on numbers is ~5/day per staff member and 1 staff per 2-4 patients (at hospitals, I have no idea about GPs or paramedics). so volumes will soon exceed what hobbyists can supply, but hopefully we can plug the gap before a higher volume supply can be established.

ajlennon commented 4 years ago

That is really really helpful information - thanks @markmellors.

We're just working to put out a 3rd video which will be the last tonight then I think @amcewen has plans to edit this thread. It'll be interesting to see how the design can sit with the requirements you list above.

KarlDunkerley commented 4 years ago

Mark, Do you have any Pet spare that I could purchase off you? Just want to test prototype and cutting speeds. Cheers, On Wednesday, 25 March 2020, 21:26:56 GMT, markmellors notifications@github.com wrote:

Hi, I was pointed here by Alex, on Twitter. I've been trying to get my head around visor requirements over the last week. Here's what I've picked up so far: I think this is the best description of the requirements: https://docs.google.com/document/d/15k20PMe14_XQa-8kTA2G7nSIrF1bGSpc90_GM9H8yNI/edit I know that's US centric, but it matches up well with the product that a UK hospital (Addenbrookes) told me they were using. I think elastic is prefered over velcro, for one handed operation I think a foam pad is preferred for comfort, over a 3d print, and it also serves as a brow sheild. I agree with what you've said above about sterilisation and disposablity. I'm still waiting to hear back about how possible sterilisation is and why they don't currently do it. I've bought some 0.5mm PET sheet (8x4'!) to start with, about £10/sheet, bayplastics.co.uk, so not really worth faffing with pop bottles. I think thinner is better/cheaper, if it can be sourced. 0.18mm is what's used in the delve design. I haven't found a low volume source yet.

My current estimate on numbers is ~5/day per staff member and 1 staff per 2-4 patients (at hospitals, I have no idea about GPs or paramedics). so volumes will soon exceed what hobbyists can supply, but hopefully we can plug the gap before a higher volume supply can be established.

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markmellors commented 4 years ago

I'm still waiting for my PET to arrive. Was meant to be here today. I should be able to send you enough for one visor though. Straight to DoES?

KarlDunkerley commented 4 years ago

Whereabouts are you? I'm in Southport/Ainsdale. Can drive over maybe.

On Wednesday, 25 March 2020, 22:13:57 GMT, markmellors <notifications@github.com> wrote:

I'm still waiting for my PET to arrive. Was meant to be here today. I should be able to send you enough for one visor though. Straight to DoES?

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markmellors commented 4 years ago

lol. Hitchin, Hertfordshire

KarlDunkerley commented 4 years ago

Bugger! My Machine can do 500mm x 300mm so any sheets around that or A3 appreciated. Can get two visors from an A3 with my design. Cheers On Wednesday, 25 March 2020, 22:17:40 GMT, markmellors notifications@github.com wrote:

lol. Hitchin, Hertfordshire

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KarlDunkerley commented 4 years ago

Have contacted this chap about 0.18mm PET. APET and RPET reels - Stephen Webster Plastics

|

APET and RPET reels - Stephen Webster Plastics

Virgin APET or Recycled RPET reels for packaging in 0.18mm to 1.1mm and almost any width. Call our sales team fo... |

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On Wednesday, 25 March 2020, 21:26:56 GMT, markmellors <notifications@github.com> wrote:

Hi, I was pointed here by Alex, on Twitter. I've been trying to get my head around visor requirements over the last week. Here's what I've picked up so far: I think this is the best description of the requirements: https://docs.google.com/document/d/15k20PMe14_XQa-8kTA2G7nSIrF1bGSpc90_GM9H8yNI/edit I know that's US centric, but it matches up well with the product that a UK hospital (Addenbrookes) told me they were using. I think elastic is prefered over velcro, for one handed operation I think a foam pad is preferred for comfort, over a 3d print, and it also serves as a brow sheild. I agree with what you've said above about sterilisation and disposablity. I'm still waiting to hear back about how possible sterilisation is and why they don't currently do it. I've bought some 0.5mm PET sheet (8x4'!) to start with, about £10/sheet, bayplastics.co.uk, so not really worth faffing with pop bottles. I think thinner is better/cheaper, if it can be sourced. 0.18mm is what's used in the delve design. I haven't found a low volume source yet.

My current estimate on numbers is ~5/day per staff member and 1 staff per 2-4 patients (at hospitals, I have no idea about GPs or paramedics). so volumes will soon exceed what hobbyists can supply, but hopefully we can plug the gap before a higher volume supply can be established.

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ajlennon commented 4 years ago

Videos of the work today

These are all first passes, all have pros and cons, but I confess I do like what Adrian has come up with here in #3

(1) NHS PPE eye protector evaluation #1 - 3D Printed Visor

https://youtu.be/WjN5fSOK3HE

(2) NHS PPE eye protector evaluation #2 - Laser Cut Visor

https://youtu.be/i4zo93ani40

(3) NHS PPE eye protector evaluation #3 - Optimised Laser Cut Visor

https://youtu.be/2b9gzPKdUrw

KarlDunkerley commented 4 years ago

BUGGER!!! Hoped this org had some 0.18mm PETG we could use but they are already using it. See below.....

Hi, Any idea who might have some available?

Cheers,

Karl Dunkerley

Mob 07710 353 122

eml karldunkerley@yahoo.com

On Thursday, 26 March 2020, 07:58:29 GMT, Lauson Higgins lauson@stephen-webster.co.uk wrote:

Hello Karl

Thank you for your email this morning

We are also working as part of a collective in production of visors specifically destined for NHS direct / non profit

All going to plan we’ll mass produce 80,000 Face Sheilds and I know you will appreciate how that takes priority on material allocation ect

As you can imagine, all clear substrates are taking a bit of a kicking on availability

Really appreciate your communication

Keep doing what you are doing !

Lauson BDM Stephen Webster Plastics Email: Lauson@stephen-Webster.com Mobile: +447415241115 Office: 01727 863 138

On Wednesday, 25 March 2020, 22:45:09 GMT, Alex Lennon <notifications@github.com> wrote:

Videos of the work today

These are all first passes, all have pros and cons, but I confess I do like what Adrian has come up with here in #3

(1) NHS PPE eye protector evaluation #1 - 3D Printed Visor

https://youtu.be/WjN5fSOK3HE

(2) NHS PPE eye protector evaluation #2 - Laser Cut Visor

https://youtu.be/i4zo93ani40

(3) NHS PPE eye protector evaluation #3 - Optimised Laser Cut Visor

https://youtu.be/2b9gzPKdUrw

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RussCoty commented 4 years ago

Did you all see the Trotec email the other day with the lanyard door handle grabber? a simple laser cut design.

Might be worth leveraging Trotec's mailing list to get this out to laser cutter operators worldwide.i think this might be of extreme use in less wealthy countries where mediacal staff are even more streched for PPE

KarlDunkerley commented 4 years ago

WOOHHHOOOOO!!!

Sort of...

Have found a supplier of 400 micron PETGAG in 1040 x 1550 in stock at £2.56 per sheet plus VAT. With my design that is 25 to a sheet and 10p each. 400microns compares to 180 microns for OHP transparency so a good thickness to use and laser. However, for health and safety, they will only ship in pallet loads of around 870 sheets. That's around 22,000 visors we could make from it. This means an outlay of approx £2,600 per pallet. I can probably get hold of a van and pallet shifter. Thoughts anyone?

KARL

On Wednesday, 25 March 2020, 22:45:09 GMT, Alex Lennon <notifications@github.com> wrote:

Videos of the work today

These are all first passes, all have pros and cons, but I confess I do like what Adrian has come up with here in #3

(1) NHS PPE eye protector evaluation #1 - 3D Printed Visor

https://youtu.be/WjN5fSOK3HE

(2) NHS PPE eye protector evaluation #2 - Laser Cut Visor

https://youtu.be/i4zo93ani40

(3) NHS PPE eye protector evaluation #3 - Optimised Laser Cut Visor

https://youtu.be/2b9gzPKdUrw

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RussCoty commented 4 years ago

I would assume that final assembly would be done on site at the medical facility?

Just another crazy thought....is there a way that the sheet can be cut to be the whole mask? I can't envision it myself but I thought it was worth putting out there. A single sheet die cut that kind of unwraps to connect around the head....remember those old card caps that you used to get in the 80s? That kind of thing.

RussCoty commented 4 years ago

Also @amcewen you had a 2 hole punch but I guess those units are made for a 4 hole punch?

Could your laser cut band have notches to accomodate holes instead? like little upside-down U shapes:

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KarlDunkerley commented 4 years ago

Mine could go out as components to be quickly assembled but can be done in a minute or so. Components would ship in smaller boxes as the forehead standoff foam would take space up. Foams could go separate and the rest assembled I guess but v simple to do either way.

On Thursday, 26 March 2020, 09:04:43 GMT, RussCoty <notifications@github.com> wrote:

I would assume that final assembly would be done on site at the medical facility?

Just another crazy thought....is there a way that the sheet can be cut to be the whole mask? I can't envision it myself but I thought it was worth putting out there. A single sheet die cut that kind of unwraps to connect around the head....remember those old card caps that you used to get in the 80s? That kind of thing.

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ajlennon commented 4 years ago

Great work @KarlDunkerley !

RussCoty commented 4 years ago

I guess the next step is to confirm that the services actually will use them?

ajlennon commented 4 years ago

Absolutely @RussCoty - hoping to get somebody on a call today. Fingers crossed

RussCoty commented 4 years ago

Great work @ajlennon, wondering how to best get this info out to other countries too.

ajlennon commented 4 years ago

Absolutely @markmellors has been asking the same kinds of questions

RussCoty commented 4 years ago

Press releases might be the answer

DoESLiverpool / somebody-should