PD3D | Augmented Stethoscope
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Augmented Stethoscope

About This Project

The Augmented Stethoscope (AS) looks and functions like a regular stethoscope, but relies on electronics to stream, record, and manipulate heart, lung, and other body sounds.

Undergraduate and graduate students, post-docs, and faculty have participated in the development of the Augmented Stethoscope, including: Edward “Danny” Nichols, Mohammad Odeh, Michael Xynidis, Fluvio Lobo Fenoglietto, and Jack Stubbs

SOFTWARE

Latest software builds, including development branches, can be found in our Augmented Stethoscope GitHub repository.

HARDWARE

Figure: Augmented Stethoscope v.3.0 fully assembled. Diagram of standard stethoscope parts taken from Wikipedia

The Augmented Stethoscope features all of the components of a standard stethoscope, including: (1) chestpiece, consisting of a diaphragm and a bell, (2) flexible acoustic tubing, and a (3) headset, consisting of a binaural spring, eartubes, and eartips or earplugs.

In addition, the Augmented Stethoscope features electronics capable of streaming, recording, and manipulating heart, lung, and other body sounds. Electronics are consolidated in a 3D-printed box (4) designed to connect in-line with the flexible acoustic tubing. This versatile design allows users to integrate our electronics with any stethoscope.

The Augmented Stethoscope was based of the Teensy 3.2 (1) and the Teensy Audio Adaptor Board (2), from PJRC. The Audio Adapter Board connects the Teensy board to a CUI microphone (3) and a Knowles balanced armature speaker (4). The device communicates using a Bluetooth antenna (5) (Sparkfun BlueSMiRF) and it is powered by a 400 mAh LiPo battery managed using a charging module (6) (Adafruit Micro Lipo). The latest version also features RF charging (6) (Adafruit Qi Wireless Receiver Module).

The electronics box, holder, and other components were design using Onshape. A release version has been generated for the Augmented Stethoscope v.3.0. An interactive and annotated version of the release model, embedded below, is available on Sketchfab.

IMPLEMENTATION

The latest Augmented Stethoscope build relies on our Control System for operation. On its own, the Augmented Stethoscope was designed to function like a regular stethoscope. As the Augmented Stethoscope streams sounds from the microphone, the Bluetooth antenna listens for pairing and operation commands. These commands are sent from a Control System. Commands have been documented for cross-platform implementation (including mobile). For more information, visit the pd3d/ControlSystem GitHub repository.

PUBLICATIONS
  1. Stubbs, J., Lobo F., Stubbs, K., Leblanc, K. (2018) Medical training and performance assessment instruments, methods, and systems. Assigned to NATIONAL BOARD OF MEDICAL EXAMINERS, EDUCATIONAL COMMISSION FOR FOREIGN MEDICAL GRADUATES. U.S. Patent Office Application Number 15/846,438, Publication Number US20180174488A1. Published on June 21, 2018.
Category
3D Printing, Medical, Prototype