Electronic Stethoscope

Project developed by Pnjensen

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Abstract

Electronic Stethoscope.jpg

Stethoscopes are a critical toll used by doctors on a daily basis for amplifying the body's functions. Primarily, heartbeats and breaths are the primary target of listening. Usually, stethoscopes work by using a large diaphragm and a tiny pipe to transmit the audio to the ears. In the past, 3D printed stethoscopes have been attempted, and failed to work well. This is due to the large reduction in area from the diaphragm to tubing that is required to get a large amplification. This stethoscope avoids that by using an electret microphone and audio amplifier to drive a pair of earbuds. This allows for high amplification, flexibility in listening as two or more people can listen to the audio, and potentially even recording and transmission to remote doctors.

Bill of Materials

  1. Provide a full BOM -- Materials needed for fabrication of device and alternative materials if they are not available, prices/sources of non-printable parts
    1. Upload and link to all source files from open source CAD
    2. Upload and link to all STLs
  1. Parts from YouMagine: Total: 67 grams at $22/kg = $1.47
    1. Pickup
    2. Battery Box
    3. Battery Box Cover
    4. Jack Case
    5. Power Case
  2. Microphone: $5.95 x1
  3. Amplifier: $7.95 x1
  4. Power Switch: $0.50 x1
  5. Potentiometer: $0.95 x1
  6. Battery Clips: $0.50 x4
  7. Audio Jack: $1.50 x1
  8. 8 cm Filament
  9. Thin Wire (18 to 24 AWG): 30 cm ~$1
  10. Headphones/Earbuds: ~$1
  11. AA Batteries: ~$0.50 x2

Total Cost: $23.32

Tools needed for fabrication of the OSAT

  1. MOST Delta RepRap or similar RepRap 3-D printer
  2. Wire Cutter
  3. Wire Stripper
  4. Soldering Iron and Solder
  5. Optional: X-Acto knife, box cutter, straight-blade knife for part cleaning

Skills and Knowledge Necessary to Make the OSAT

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

Technical Specifications and Assembly Instructions

  1. Provide directions for print/assembly - be detailed enough in your “how to” to ensure that someone could construct the device from your description. Consider the elegance of IKEA like instructions.
  2. Include print time estimate
  3. Include assembly time estimate
  4. Including drawings or pictures of the device at stage of assembly at minimum. (http://www.appropedia.org/Special:Upload)
  5. Consider video if appropriate
Example video summary of textbook
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Common Problems and Solutions

  • Include common mistakes/problems to avoid in building your OSAT and how to overcome them

Cost savings

The closest equivalent to this stethoscope is a Littman Digital Stethoscope:

BOM Cost: $23.32

Comparable Device: Littman Digital Stethoscope $429

Savings: $405.68

Percent Savings: 94.56%

References

Images in Wiring Diagram: [1] [2] [3] [4] [5] [6] [7]

  1. web page: AA Battery Available: https://www.sparkfun.com/products/9100
  2. web page: Mono Amplifier Available: https://www.sparkfun.com/products/11044
  3. web page: Electret Microphone Available: https://www.sparkfun.com/products/12758
  4. web page: Power Switch Available: https://www.sparkfun.com/products/11138
  5. web page: Potentiometer Available: https://www.sparkfun.com/products/9939
  6. web page: Battery Clip Available: https://www.sparkfun.com/products/7949
  7. web page: Audio Jack Available: https://www.sparkfun.com/products/8032

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