ELECTRONIC STETHOPHONENDOSCOPE GAUGE Russian patent published in 2002 - IPC

FIELD: medical engineering. SUBSTANCE: device has body with unit for squeezing cable connected to resistor manufactured from material having sound oscillation propagation speed exceeding that in the cable coating. Resonator unit part adjacent to patient body has concentrically arranged grooves. Through holes are produced in resonator unit body which diameter is not greater than 0.5 mm and its length is not greater than 5 mm. The holes connect internal part of resonator mouth with the surrounding medium. Envelope is tightly fixed on the resonator and the body. The envelope is manufactured from material, sound oscillation propagation speed in which is equal to one in cable coating. EFFECT: high noise immunity level; reduced transition distortions. 1 dwg