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Ear probe and impedance audiometer

A technology for audiometers and sound resistance tubes, applied in audiometers, applications, medical science, etc., can solve the problem of sound pressure reduction and achieve the effect of improving detection accuracy and accurate ossicular muscle reflex inspection

Active Publication Date: 2015-06-24
RION COMPANY
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Problems solved by technology

However, when a stimulus sound component of 500 Hz is output, it may be confirmed that the sound pressure of the detected probe sound component decreases

Method used

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  • Ear probe and impedance audiometer
  • Ear probe and impedance audiometer
  • Ear probe and impedance audiometer

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Experimental program
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Embodiment Construction

[0019] Usually, in order to facilitate the insertion of the part of the ear probe 1 into the external auditory canal, the part is formed in a shape extending long. Therefore, sound components from the external auditory canal are detected by the microphone 5 inside the ear probe via the tube 13 that passes through the inside of the long-protruding insertion portion. The stimulus sound component output from the external auditory canal is sufficiently attenuated to such an extent that the detection of the probe sound component is not affected while passing through the tube 13 .

[0020] However, if the ear probe 1 is downsized, the probe sound component detected by the microphone 5 may become smaller than the original probe sound component (85 dBSPL) corresponding to the stimulus sound component. As a result of the investigation, it was confirmed that this phenomenon occurs when a stimulus sound of 500 Hz is used. In addition, at this time, it was confirmed that a sound componen...

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Abstract

The present invention provides an ear probe capable of improving detection precision of probe sound input to a microphone, and an impedance audiometer including the ear probe. The ear probe (1) is used for the impedance audiometer used in auditory ossicle muscle reflex inspection, and the ear probe (1) comprises: an opening (8), a microphone (5), a transmission path (14) from the opening (8) to the microphone (5), and an acoustical filter (15) disposed on the transmission path (14) and used for reducing sound pressure of a stimulation sound component before the stimulation sound component arriving the microphone. The acoustical filter (15) comprises a sound volume (7) connected with a pipe (13) and an acoustic impedance pipe (6). The cut-off frequency of the acoustical filter (15) is a value more than 226Hz and less than 500Hz.

Description

technical field [0001] The present invention relates to an ear probe for examination of ossicular muscle reflex and an impedance audiometer provided with the ear probe. Background technique [0002] An impedance audiometer is used for the ossicular muscle reflex test (reflex test). The main body of the impedance audiometer includes an ear probe for emitting sound to the external auditory canal of the subject and receiving sound in the external auditory canal. Using the aforementioned ear probe, an intermittent sound (stimulus sound) was given while a continuous sound (probe sound) at 226 Hz and 85 dBSPL was given to the closed external auditory canal to perform an ossicular muscle reflex test. [0003] Stimulus tones were provided in 5dB steps or 10dB steps with sound pressure levels from 80dBSPL to 110dBSPL for each frequency of 500Hz, 1000Hz, 2000Hz, and 4000Hz. [0004] Since the ossicles contract reflexively in response to a stimulating sound, the ossicles show a respo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/12
CPCA61B5/126
Inventor 中岛龍一鹈沢政利本间章
Owner RION COMPANY
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