A stethoscope includes a flexible chest piece including a top surface, a bottom surface, a side surface defining a slope between the top surface and the bottom surface, and a groove extending along an inner circumference of the chest piece A diaphragm is positioned within the groove.一種聽診器包括一可撓性胸件,其包括一頂部表面;一底部表面;一側表面,其界定一介於該頂部表面與該底部表面之間的斜度;及一凹槽,其沿著該胸件之一內部圓周延伸。一振膜係定位在該凹槽內。