3M Littmann - Electronic Stethoscope Model 3000 With Ambient Noise Reduction (ANR) technology, up to 18 times amplification, and a two-year warranty, the Model 3000 is tomorrowÆs stethoscope. Littmannùthe brand that stands for performance, innovation, and long lasting quality. HOW AMBIENT NOISE REDUCTION (ANR) WORKS. Ambient noise isnÆt just in the air; it also travels through the patientÆs body. The key to reducing ambient noise is to address both pathways. And ANR does just that without filtering away important sounds. Noise from the room enters the stethoscope through a thin gap in the chestpiece and, once inside, meets noise that enters through the body. The two cancel each other out, leaving the heart, lung and other body sounds you want to hear. Ambient Noise Ambient Noise Heart ANR technology acoustically cancels out an average of 75% of distracting room noise. This acoustic canceling effect is different than electronic filtering, which may also filter out some portions of body sounds.FINDING CLARITY AMID CACOPHONY. Until now, the advantages of amplification in an electronic stethoscope have been negated by the sensitivity of electronic stethoscopes to distracting sounds from ambient room noise and friction on the surface of the patientÆs body. But thanks to a proprietary technological advancement known as Ambient Noise Reduction (ANR), the 3M Littmann Electronic Stethoscope Model 3000 allows you to tune out the room when you turn up the volume. This new technology reduces distracting room noise by an average of 75% (û12dB) without eliminating critical body sounds. Combine that with amplification up to 18 times greater than the best acoustic (non-electronic) stethoscope and you have an instrument that is uniquely equipped to help you pick up difficult-to-hear heart, lung and other body sounds. Even when the world around you is filled with distracting noise.WHAT CLINICIANS HAVE SAID. 82% of cardiologists indicated it was easier to detect/hear an aortic regurgitation murmur (Grade 1 or 2) with the Model 3000 than with an acoustic (non-electronic) cardiologytype stethoscope.1 90% of critical care nurses indicated it was easier to detect/hear abnormal lung sounds with the Model 3000 than with an acoustic (non-electronic) cardiology-type stethoscope.2
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