Stethoscope with reduced susceptibility to interference from amb

Details Stethoscope with reduced susceptibility to interference from amb Stethoscope with reduced susceptibility to interference from amb

1997-02-20

2000-02-22

Chang, Vivian

Electrical audio signal processing systems and devices

Stethoscopes, electrical

181131, 181137, A61B 704

Patent

active

060289422

ABSTRACT:
A stethoscope, and a stethoscope chestpiece, with an increased signal to noise ratio. The invention concerns mechanical improvements to both traditional mechano-acoustic stethoscopes, and to electronic stethoscopes. The stethoscope chestpieces of this invention are constructed so that the transducers are responsive to the pressure differences between air pressure variations in the chestpiece air cavity which is coupled to the skin, and the air pressure variation due to ambient noise present in the environment. The result is a transducer output with increased signal to noise ratio.

REFERENCES:
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patent: 4072822 (1978-02-01), Yamada
patent: 4270627 (1981-06-01), Hill
patent: 4362164 (1982-12-01), Little et al.
patent: 4387784 (1983-06-01), Hill
patent: 4502562 (1985-03-01), Nelson
patent: 4903794 (1990-02-01), Klippert et al.
patent: 5492129 (1996-02-01), Greenberger
patent: 5616890 (1997-04-01), Boussignac
patent: 5737429 (1998-04-01), Lee

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