To help your doctor out there is this research;
Study Shows That Vibroacoustic Therapy is More Than Just Noise
http://journals.lww.com/ear-hearing/Abstract/1985/09000/Spectral_Characteristics_of_Air_and_Bone.11.aspx
Schwartz, Daniel M.; Larson, Vernon D.; De Chicchis, Albert R.
Abstract
This study sought to determine differences in the
acoustic spectra of five different transducers commonly used for
stimulus presentation to record the auditory brain stem response (ABR).
The outputs of three commercially available bone conduction vibrators
(Radioear B-70A, 8-71 and B-72), a TDH-49 earphone, and an insert
receiver were measured by applying a 0.1 msec rectangular electrical
pulse to each transducer. The resultant output for each transducer was
converted to one-third octave band data and plotted against reference
threshold levels. Results demonstrated relatively flat acoustic spectra
and high output levels for the two air conduction receivers. In
contrast, each of the bone oscillators had its greatest concentration of
energy in the 2000 Hz region with the spectrum characterized by a
precipitous decrease in output at frequencies above and below this
resonance peak. Maximum output never exceeded 35 dB HL for any of the
three bone conduction devices. Of the three oscillators, however, the
B-70A appeared to provide the highest output before reaching saturation.
Results are discussed relative to the limitations for recording the
auditory brain stem response to bone conducted transient signals.
A current sample of what is available today;
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