COMPARISON OF THE ACOUSTIC PROPERTIES OF 6 POPULAR STETHOSCOPES
COMPARISON OF THE ACOUSTIC PROPERTIES OF 6 POPULAR STETHOSCOPES
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DOI：
10.1121/1.403655
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发表时间：
1992-04-01
影响因子：
2.4
通讯作者：
PENNEY, DG
中科院分区：
文献类型：
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作者：
ABELLA, M;FORMOLO, J;PENNEY, DG
本研究借由使用一个声频产生器及一个主动式人工耳来评估听诊器的声学效果。 比较了六种流行的、目前可用的听诊器在其各种模式下（包括铃、隔膜等）的情况： Littmann Classic II、Littmann Cardiology II、Littmann Master Cardiology、Hewlett-Packard Rappaport-Sprague、Tycos Harvey Triple Head和艾伦医疗系列5A RPS双耳。 传递函数的测量范围是37.5-1000 Hz，几乎所有的心肺音都在这个范围内。在大多数情况下，低频范围（37.5-112.5 Hz）的声音被钟放大，被横膈膜衰减;然而，没有显著差异。 钟和振膜都能衰减高频范围内的声音传播，并且随着频率的增加而增加。 Tycos Harvey三头加肋振膜比其他振膜在更大程度上衰减声音传输（P < 0.01）。 结果表明，对于一个给定的听诊器的钟和膜片通常有不同的传输特性，特别是在低频。 Littmann Classic II是一个例外。 Hewlett-Packard和Tycos Harvey听诊器在铃和隔膜之间的低频响应中显示出最大的差异。 虽然在大多数情况下，听诊器之间的声音传输差异很小，但Littmann Cardiology II（钟形和振膜）似乎是本研究设计的最佳整体性能。
This study evaluated stethoscope acoustics by using a sound frequency generator and an active artificial ear. Six popular, currently available stethoscopes were compared in their various modes involving bells, diaphragms, etc.: Littmann Classic II, Littmann Cardiology II, Littmann Master Cardiology, Hewlett-Packard Rappaport-Sprague, Tycos Harvey Triple Head, and Allen Medical Series 5A RPS Binaural. The transfer function was measured from 37.5-1000 Hz, the range where nearly all heart and lung sounds are found. Sound in the low-frequency range (37.5-112.5 Hz) was in most cases amplified by the bells and attenuated by the diaphragms; however, there were no significant differences. Both bells and diaphragms attenuated sound transmission in the high range, and this increased with frequency. The Tycos Harvey Triple Head ribbed diaphragm attenuated sound transmission to a significantly greater extent than the other diaphragms (P < 0.01). The results show that the bell and diaphragm for a given stethoscope usually have different transmission characteristics, particularly at low frequencies. The Littmann Classic II is an exception. The Hewlett-Packard and Tycos Harvey stethoscopes showed the greatest differences in low frequency response between the bell and the diaphragm. While the differences found in sound transmission between stethoscopes were in most cases small, the Littmann Cardiology II, bell and diaphragm, appears to posses the best overall performance by this study design.