gliax / stethoscope Goto Github PK

A few device designs should be proposed, and then the best of these will be selected to go forward.

Realistically, there's no issue in testing several, since the testing time is not likely to take that long.

I would like to make customizations/modifications to the design but not doing very well with SCAD (super slow for some reason). The STL gives errors while being imported into Solidworks, so I figure that it would be easier if I could re-design from scratch given the dimensions.
If it would be possible to also upload a pdf of drawing dimensions, it could help others as well :)

Hopefully the question of how should have been answered by Issue #4.

In this case, we actually test the device.

What statistical analysis is needed to test the non-inferiority of the device?

For that matter, what kind of study should be done to validate devices?

When we switched to commodity earbuds, the eartube shape became an issue for a small number of users (?5-10%), making the sound of the stethoscope poor.

Upon examination of several of these users' ear canals, they seem to respond poorly to the downward angle and the forward angle of the eartubes.

The spring is too tight initially and needs significant softening to work properly.

I'm currently printing the parts and now I'm reading the readme and it says I should print inserts, I assumed they were additional 3D printed inserts of some sort for the stethoscope. Looking at the files and I've worked out they're paper information cards. It would be helpful to readers if a distinction was made between 3D printed parts and paper printed information, maybe call them information cards or something instead of inserts?

Thanks

Tubes used for connections from head to T-connector, then T-connector to earpieces.

Do you have any specifications for the rubber/silicone ring we should purchase to hold on the diaphragm (similar to the other products you specified)? Thanks!

... to see easily which side is the correct one to bolt it on.

The report cover used as the membrane in GliaX is unfortunately not available in Europe, and I have had difficulty finding a replacement.

The .35mm PVC sheets available from many eBay sellers are far too pliable; I tried these in my printed copies of the stethoscope and the membrane was completely useless. Are any sources apart from this specific Staples product recommended or usable, and procurable within the EU?

Recruitment strategies:

1. Recruit emergency medicine physicians
2. Recruit cardiologists
3. Recruit anaesthesia
4. ? Multisite:
   • U Toronto?

For those who are planning to make derivative works from this repository and other of your projects it would be beneficial to know where exactly in the commit history Version 1.0 or 2.0 etc is. That way it can easily be delineated that if there is some backwards compatibility it is compatible with Version 2.0 for example.

See below image taken for reference in the right hand panel of the GitHub repository.

Happy to help but this requires having collaborator's rights to the repository

This is done as per https://github.com/GliaX/Stethoscope/blob/master/Testing/2015-03-31/Stethoscope_Validation.md

What is the protocol for testing the device?

Hopefully this should be informed by Issue #8.

A review of the literature to figure out where things stand in stethoscope research and design.

REB proposal and approval

• Find REB guidelines and application
• Get ROMEO account
• Complete REB proposal on ROMEO
• Send for advice and peer review
• Submit REB proposal to board. Deadlines
• Get approved

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rotate([0,90,earbud_rotation])cylinder(r=6,h=9.5);

Present this research and the idea of Free hardware at CAEP.

Chris won't be there, so this will be Tarek's responsibility.

To do this, need to:

1. Submit to CAEP
2. Get accepted
3. Make presentation files
4. Present

RRD presentation to be done by Chris

1. The tube connecting the eartube to the Y-pieace is called for it to be 20cm long in the list of materials, but if I look at the sample in FB it looks shorter, is 20 cm is till the length to go with?
2. I had a really hard time with the outer diameter of ear-tubes and Y-piece and the 4mm inner diameter/6mm OD tubing. It seems to me that this tubing should have a wider ID or the Y and ear-tubes be smaller in diameter. What do you think? Look at the connecting points on my current prototype

What equipment will be needed for testing the device?

Out of hand, I would say:

• Microphone
• Speaker
• experimental stethoscope
• sound-proof room

What else?

Hi,

Thanks for sharing this documentation!

A small suggestion: could you please improve the bill of materials section by adding the specific use/purpose, supplier number, order number and price of each bill of material item to make it clearer how much it all costs. Once it becomes visible for everyone, someone might find an alternative supplier that is cheaper with equal or better quality components.....

Here is an example:

http://labs.nortd.com/lasersaur/bom-one-subsystems-eur

Regards,

Mark Rijckenberg

I encountered this problem while I tried to print the parts using a Fisher RepRap which has a circular printing bed of 150mm.

The parts which need to be changed are the

• stethoscope_eartube.scad
• stethoscope_spring.scad

Thanks for the design - this is our new home project.

Sorry if this sounds like a dumb question, but nowhere do I see the diameter of the Diaphragm.

Is it supposed to sit inside the lip on the top of the head ?
Does it extend to the inner edge of the ring ?
Should it be glued to the lip, or does it need to have some play between the lip and the ring ?

I designed a part that can be cheaply 3D printed and holds a #11 X-Acto knife blade to cut diaphragms from PVC report covers: https://gitlab.com/mcdanlj/circlecutter

Feel free to add it as a resource.

A patent search regarding all USPTO (and Canadian?) patents that deal with stethoscopes. These should be categorized as those expiring within the next 2 years, and those active for 2years+

Patent searches can happen at the following:

• https://www.google.com/?tbm=pts (american)
• http://patft.uspto.gov/ (american)
• http://brevets-patents.ic.gc.ca/opic-cipo/cpd/eng/introduction.html (canadian)

Results should be put on the wiki here:

https://github.com/FreeMedicalHardware/Stethoscope/wiki/Patent-search

tarek : )

Cindy Langford [email protected]

Eman says ' run it by Rod Lim (peds site chief) as well.'

There is no licensing information for the files, especially the .scad files. Please post copyright notice and license.

See https://github.com/GliaX/Stethoscope/blob/master/stethoscope_head/eartube.stl for model and https://github.com/GliaX/Stethoscope/blob/master/stethoscope_head/lib/printed/eartube.rb for source.

Needs:

• Fix bend in stem
• Human testing again.

There is a wired thing: The Y-shaped part will fit with the 8 mm tube to the diaphragma but not to the ear things. I printed it twice. I used petg with a prusa.

Obviously prepare manuscript for publication.

Who are the people we'd send to?

I'm a bit stuck with assembling the head, do I need to glue the diaphragm to the ring or does it just get sandwiched and should the membrane be held tight or is it ok if it moves around? Looking at the box insert made it a bit clearer how it fits together but not how it should behave.

After running statistical analysis, run it by somebody very familiar in stats to verify that we've done it right and that it makes sense.

Presentation at the SAEM conference

Only data taken on 03-31 should remain in that folder. Otherwise, the remainder should be moved into the 'testing' directory in general.

I bought the xcessor ear plugs but those don't seem to fit with the ear tubes. Which type should I buy?

Just field tested your stethoscope, I noticed that you are using 2 different formats for the head the one from OpenScad code is different from the Master list, I have printed both under the prescribed settings for the model. Neither have preformed better than a littmann classic with just a simple test using a medical simulator using breath sounds set to wheezing the printed one sounded more dull than the littmann..My thoughts are that maybe the report cover that I have bought is different, the tubing is the from a cardiac 3 fits perfectly. So I am thinking the diaphragm density my have something to do with it. I would like to work with you to improve your model. My team is considering maybe conducting a study on your stethoscope, so any help to support would be much appreciated.

In this story on SoylentNews about the stethoscope design, editor "cmn32480" wrote:

[Ed: as of posting there is no license on the Github documents. Thus as per the Berne Convention it is not yet freely available, until explicitly published under an open license such as CC or similar. ]

Under what license will these plans be made available? The GNU project maintains a list of licenses for designs of physical objects.

What might be the best alternative material to Acrylonitrile butadiene styrene (ABS) plastic?

It looks like the suggested diaphragm material is not available in a lot of countries (including in the UK, or at least not under that name). It would be really helpful if the properties needed could be described, its unclear how the material should behave, how flexible etc.

What do you think of expanding the membrane drum to 5mm ?

I think it would be able to funnel more acoustical signal up the pipes , especially if fitted with a modified chest piece scaled up to 50mm : https://www.thingiverse.com/thing:2895115

This is done as per https://github.com/GliaX/Stethoscope/blob/master/Testing/2015-03-31/Stethoscope_Validation.md

? Engineering lab at UWO?

Mainly an esthetical error, should be found out why this happens.

I'm having a few issues with the eartube file, the segments don't seem to be meshed together properly and they come out separate in the output file. The source file for eartube isn't in the master folder. Is there a way to get the source file?
Regards

In the R & D phase, we should also answer the question:

What is the industry standard for testing medical devices such as stethoscopes?

• Email Jon D. to ask re: best contact, best design
• Determine design

Suggested design:

Two studies:

1. Blinded with 10 control, 10 intervention
2. Unblinded, open-label.

Is this page being used on another website that has a different rendering scheme?

It appears that when trying to view the markdown file in the browser that the images & some titles are not rendering correctly

Happy to make a pull request to make it easier to read in the browser if interested!