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Noise canceling improvement to stethoscope

  • US 5,909,495 A
  • Filed: 11/03/1997
  • Issued: 06/01/1999
  • Est. Priority Date: 11/05/1996
  • Status: Expired due to Fees
First Claim
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1. A stethoscope for reducing background noise comprising:

  • a housing having a receiver portion and an audio output means;

    the receiver portion having a plurality of noise ports;

    a microphone isolator located within the receiver portion;

    a noise canceling microphone having a front end and a back end enclosed by the microphone isolator;

    an acoustical tube having an acoustical waveguide connected to the microphone isolator for channeling an input signal;

    a chest piece having a sound diaphragm pickup for receiving the input sound and noise signal connected to said acoustical tube to permit a pressure gradient noise porting by said noise ports placed at the back end of the microphone which is internally located before the noise ports.

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