Acoustical stethoscope with electrical filter

摘要

PCT No. PCT/CH86/00140 Sec. 371 Date Jun. 9, 1987 Sec. 102(e) Date Jun. 9, 1987 PCT Filed Oct. 8, 1986 PCT Pub. No. WO87/02233 PCT Pub. Date Apr. 23, 1987.The stethoscope comprises a membrane (2) sensor (1) connected by a tube (3) to ear-pieces (8 & 9). The tube (3) traverses a casing (10) containing an electrical unit connected by a cable (12) to an electrical sensor (11). The electrical unit is sensitive to a given frequency range and comprises an electro-acoustic emitter (19) supplying acoustic signals into conduit (3) which are obtained in response to signals coming from the sensor (11) according to a predetermined scheme.