Patent ID: 6438238
Filing Date: 2002-08-20
Classification: A61B

Abstract:
A chest piece suitable for use in a stethoscope and comprising:a housing having a cavity which acts as a sound chamber, said cavity having a cavity surface which is a surface of revolution generated by rotating a parabola about its axis of symmetry to form a paraboloid having a paraboloid apex, a paraboloid focal point, and a paraboloid axis, said cavity terminating in said paraboloid apex and in a substantially planar opening, said opening being substantially normal to said paraboloid axis and positioned such that said paraboloid focal point resides in said cavity; a transducer for converting received sounds into an electronic signal; a bracket attached to said housing and configured so as to affix said transducer at or near said paraboloid focal point; a membrane covering said opening so as to close said cavity, and a fluid which fills said cavity.