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Stethoscope upgrade

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MOST Delta filament as guide.JPG This page was part of an MTU course MSE4777 OA and MSE4777 OB/MSE5777/EE4777/EE5777: Open-source 3-D printing

Please leave comments using the discussion tab. The course runs in the Fall semester. It is not open edit.

Stethoscope Upgrade - OSAT project[edit]

Project developed by [[[User:Kev Man|Kev Man]] (talk) 23:21, 7 December 2015 (PST)]
This OSAT has been designed but not yet tested - use at own risk.
This OSAT has been prototyped.

You can help Appropedia by contributing to the next step in this OSAT's status.


3D printed stethoscope (with minimal/cheap non-3D printed parts). Having 3D printed medical diagnostic equipment could give underprivileged areas cheap and easy access to much needed tools, while also letting these areas save money for more complex equipment that they may not have had access to otherwise.

Diaphram sideview.JPG
Diaphram topview.JPG

Bill of Materials[edit]

Non-Printed parts

  1. 1/2" (outer diameter) Black rubber tubing - 24" long - (~ $8.00 USD / 5 ft)
  2. 2" (outer diameter) plastic O-ring (~ $2.00 / 2 )
  3. 1/2"(outer diameter) tygon tubing - 2 pieces 6cm long (~ $40.00 USD / 10 feet)
  4. small balloon (5" round if blown up) - pack of 30 ~ $2.00 USD
  5. Epoxy - any type

Source and STL files[edit]

Thingiverse link

Tools needed for fabrication of the OSAT[edit]

  1. MOST Delta RepRap or similar RepRap 3-D printer
  2. Scissors or knife

Skills and Knowledge Necessary to Make the OSAT[edit]

  • If you used special skill – link to relevant wikipedia or wikiversity articles/courses

No special skills needed to make OSAT

Technical Specifications and Assembly Instructions[edit]

  1. Include print time estimate ~ 4 hrs, 30 min.
  2. Include assembly time estimate - 5 minutes

To assemble:

  1. Print all pieces
  2. Cut tubing to lengths mentioned above.
  3. Add epoxy to the outside of the cylindrical part of the nozzle
  4. Insert the nozzle into the diaphragm with the tapper end facing out (epoxy end goes into the diaphragm).
  5. Let dry
  6. Attach black tubing to nozzle, and single end of the ear split.
  7. Attach the tygon tubing to each 'Y' section of the ear split, and the other end to an individual ear piece (section farthest away from the bend).
  8. Cut the inflation end of a balloon and stretch the remaining balloon over the large end of the diaphragm
  9. hold the balloon in place using the O-ring.
  10. place a small amount of cut black tubing over the other end of each ear piece

Common Problems and Solutions[edit]

  • Include common mistakes/problems to avoid in building your OSAT and how to overcome them
  1. To get the best sound out of the stethoscope, place a finger over the top hole of the diaphragm when using the end with the balloon attached.

Cost savings[edit]

  • If your solution is not a low cost one then it is not really appropriate.
  1. Estimate your costs : 63 g pla( $1.58), cost of non-printed parts ( ~ $5.60 USD) = Total: $7.20 USD
  2. Find a commercial equivalent : low end cost - $14.00 + diaphragm membrane ( $4.00 ) = $18 - $20 USD
  3. Calculate $ savings and % savings: Saved 9 - 13 dollars, 64% saving (if buying the $20 version)

[[Category:Health Care]].