Aegis Endo Shield

a.k.a Aeneas ENT Rigid Scope Aerosol Barrier 1.0

I got a request for an Endoscope Shield by Dr. Joyce Rodvie Sagun from QCGH-ENT-NHS here in the Philippines. We were part of '3D Printing for a Cause' FB Group, which was helping out with the lack of available medical protective equipment with 3D printed alternatives at the time.

I later learned that there was a concept from Dr. Paber and Mr. Cefino from Zamboanga City Medical Center in the ENT community. (please check the release notes for more detail). At the time there was no publicly available design, and based on the concept, Dr. Sagun and I produced this implementation and released it free and open sourced.

Endoscopes are used for checking your internals, and I think using them on Covid positive patients are high risk to doctors.

Through quick collaboration and testing we have verified that the design fits most of the endoscopes used in the hospital. And we shall begin mass production soon via volunteers, from TUP students and Marikina Science High School Alumni.

Since this is an early version, I will be incorporating as usual feedback from the field and community, to iterate and further improve the design. Also possibly adopt the design to fit other models of the equipment, I'll try my best to fit in your requests.

Please feel free to contact me directly via Facebook, I know many who visit Thingiverse doesn't have or are having difficulties creating accounts. I'll be glad to help out with printing and suggestions.

Updates

• Sept 26, 2020

  • Updated description, credits, and release notes

• April 28, 2020

  • Uploaded aegis-endo-shield and aegis-endo-shield-shim

Instruction Manual

1. Print the endoscope shield frame aegis-endo-shield

2. Get a piece of paper or an acetate and line up the 4 mounting hooks, and mark them. Mark another hole for the endoscope tip itself, in the middle of the hole of the frame, just above that of the 4 mounting holes, around 5mm higher. (please see pic for reference)

3. Get a hole puncher, or even use use a sharp object to drill out the 5 holes in the acetate/transparency sheet. 4 Holes for the acetate mount, and 1 hole for the endoscope. (skip this step if you already have a template from 2, which I advise you create)

4. Attach the acetate/transparency sheet to the frame by pushing it through the hole, and locking them in.

5. Finally mount the endoscope to the frame, pushing the tip through the hole you created in the middle. If the fit is loose, especially for shorter endoscopes, use the spacer provided with this design. To use the spacer aegis-endo-shield-shim just insert on the bottom of the hole in the frame, to eliminate the gap from the frame and endoscope.

Printing Notes

• To achieve around 44 minutes print time on very good quality I calibrated the design to be printed with these settings: 0.3 Layer Height, 0.8 Extrusion Width or Line Width (very important! 50% savings in print time), on a 0.4 Nozzle. I've also tweaked the extrusion multiplier for the top or bottom layers to around 130 percent, which assured good seal of the hood.

• You can also print this on lower layer heights like 0.2, which ever you feel comfortable. It is always a trade-off for speed and quality with 3D printing.

Models Versions

• aegis-endo-shield - original version of frame for the shield

• aegis-endo-shield-shim - original version of shims or spacers used to make the fit of the endoscope to the frame tighter

Credits

• Dr. Justin Paber of Zamboanga City Medical Center. For the original concept for the protective barrier in the ENT community.

• Mr. Renter Cafino of Zamboanga City Medical Center for the concept design together with Dr. Paber.

• Dr. Joyce Rodvie Sagun of QCGH ENT-HNS Department for initiating the creation of this particular design with me, providing reference endoscopes used for the rapid prototyping, and testing the design.

Release Notes

Sept 26, 2020

• Updated the credits section. Found out that there was already a concept circulating within the ENT community in Philippines prior, although there was no publicly available design available at the time of making of this design.

• Credited both Dr. Paber and Mr. Cefino for the formulation of the concept. Basically Dr. Sagun contacted me and we produced this particular design, which was influenced by the concept from Dr. Paber and Mr. Cefino. Our goal was to address the immediate need for our frontline doctors at the time, which is i believe was successful.

• Its always great to have concepts that results in various implementations, also it is important to credit those that initially thought of the idea, kudos!

April 16 2020

• Added aegis-endo-shield.stl and aegis-endo-shim.stl for the shield.

Thing Files Guide

• aegis-endo-shield - frame for the shield

• aegis-endo-shim - shims or spacers used to make the fit of the endoscope to the frame tighter

Objectives

1. Should provide good protection to the operator during procedures
2. Can easily be serviced using simple tools
3. Low cost that can be made and given to medical front liners
4. Fast and easy printing, we need to be able to produce a lot in a short amount of time
5. Printable on a small 3D printer bed, need to leverage all available printers out there
6. Easy to assemble and limited post processing needed.

Materials for construction:

• 1 pc Acetate Sheet (A4 or Legal Short) or any plastic that is rigid (100 - 300 microns tested)
• 1 3D Printed Endoscope Frame

Printing Tips

Printed this on ABS, since I am out of filaments. Be careful of warping, consider using raft of the thin arms, else it will lift. PLA should have no problem, but consider infill and durability.

Please note, this is only a reference. Your printer setting might be different. Use whatever settings you deem calibrated for your printer.

Layers

• 0.30 - Layer Height
• 3 - Top Solid Layer
• 2 - Bottom Solid Layer
• 1 - Outline or Perimeter Shells

Speed

• 70 mm s - Default Printing Speed
• 80 mm s - XY Axis Movement Speed
• 60% - Outline Underspeed
• 80% - Infill Underspeed

Extruder

• 0.40 mm - Nozzle Diameter
• 1.30 - Extrusion Multiplier (Simplify3D)
• 130% Top or Bottom Extrusion Multiplier (Cura)
• 0.80 - Extrusion Width - IMPORTANT!!! Makes printing 2x faster than 0.40!

P.S.

Fight hard against COVID-19!

Regards from the Philippines.