Medical diagnostic appts. for checking Eustachian tubes - uses small loudspeaker transmitting sound in nostril whilst microphone detects signal in ear during swallowing,申请号FR19790016650-传众专利搜索

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发明名称	Medical diagnostic appts. for checking Eustachian tubes - uses small loudspeaker transmitting sound in nostril whilst microphone detects signal in ear during swallowing
摘要	<p>The medical appts. includes a probe (1) contg. a loudspeaker (2) intended to be inserted in a patient's nostrils. The sound produced is picked up by a detector microphone in the patient's ear. The sound may be generated at 50 Hz, and then the received sound is filtered (5) and doubled in frequency (6). The signal is processed further and provides an input to the display counter (15,16). After resetting the counter to zero the signal provided is counted. The resulting figure is used to indicate the time for which the Eustachian tube is open during swallowing. The signal is checked by counting consecutive peaks. Pulse trains of less than a predetermined length are discounted. The appts. may be used to determine the open diameter of the Eustachian tube as well as the duration of opening.</p>
申请公布号	FR2459648(A1)	申请公布日期	1981.01.16
申请号	FR19790016650	申请日期	1979.06.27
申请人	ULMER ERIK	发明人
分类号	A61B1/233;A61B5/06;A61B5/103;(IPC1-7):61B5/05;61F11/00	主分类号	A61B1/233
代理机构		代理人
主权项
地址

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