Laennec devised the stethoscope because he recognized that by inserting a rolled piece of paper between the patient's body and ear, he could improve heart sounds without having to make direct touch with the patient, which may have made them uncomfortable. This improvement on the original prevails in its design today.
US Patent Number: 3,108,652
Invention: Stethoscope
Inventor: D. Littmann
Year: 1963
Material: Ink on Japanese museum-quality archival paper. Thickness of paper: 10.3 mil (0.26 mm). Weight of paper: 5.57 oz/yd² (189 g/m²)
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