Medical-grade Stethoscope v2.0

myminifactory

This project involves a large team including Alex Pavlosky, Jennifer Glauche, Spencer Chambers, Mahmoud Al-Alawi, Kliment Yanev, Carrie Wakem, Shaker Shaheen, Mohammed Khdair, Mohammed Abu Matar and Tarek Loubani.\r\nThe goal is to create a stethoscope with research-validated plans available for free. The stethoscope should cost around $1-$2 to produce, including the bell. The peer-reviewed publication validating this stethoscope can be found here: http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0193087.\r\nCurrently, this stethoscope performs as well as the Littmann Cardiology III, a market gold standard.\r\nBill of MaterialsPrinted parts:\r\n1 head (head.stl)2 ear tubes (eartube.stl)1 Y-piece (y_piece.stl)1 Spring (spring.stl)\r\nOther hardware: Some vendors are suggested.\r\n40cm - 50cm Silicone 13mm or 12mm OD, 8mm ID, 50 durometer\r\n8MM I.D X 13MM O.D NGP60 Clear Translucent Silicone Hose Pipe Tubing (USD$7.34/meter)20cm Silicone 8mm or 6mm OD, 4mm ID (cut into 10cm pieces), 60 durometer\r\n4mm ID x 8mm ODDiaphragm: 40mm diameter cut from a report cover with approx 0.35mm plastic sheet\r\nStaples 21639 report cover (UPC 718103160223) (USD$8.84)\r\nYou can cut the diaphragm by hand or with a stamp like this oneEarbuds / Eartips: Any large-sized standard earbuds will do.\r\nSilicone Earbuds 7 Pairs - Large sizeOptional hardware:\r\nMetal spring for holding ear tubes together\r\nPrint InstructionsUse PETG or ABSLayer height: 0.2mmUse PrusaSlicer 2.0 or above to import 3MF fileModify filament and printer settings as needed.DO NOT MODIFY PRINT SETTINGSExport and printTroubleshootingIf the spring and eartubes do not fit well, go ahead and scale the spring as neededIf the head and ring do not fit well, use caution as you may be modifying the acoustics. You can scale the head a little.NotesWe do not use PLA due to deformation in heat and poor plastic quality in the spring causing early failure. PLA may be used, but the lifetime of the stethoscope will decrease significantly.We do not use brims, but you may print the eartubes and Y-pieces with a brim of 2mm to ensure that each stethoscope is created out of the same material.\r\nOther stethoscopesOthers have also made 3D printed stethoscopes. See:\r\nhttps://www.youmagine.com/designs/stethoscope-chestpieceLicensing notesAs per our understanding, hardware is not covered by copyright. However, we present our work under the TAPR OHL license insofar as it applies.