DANIEL LEE WILLIAMS
Pilots at Tree Line Dr, Liverpool, NY

4688582, Aug 25, 1987

Mar 6, 1986

6/836723

James W. Heller - Camillus NY
Andrew J. Kugler - Syracuse NY
Andrew Longacre - Skaneateles NY
Daniel L. Williams - Liverpool NY

Welch Allyn, Inc. - Skaneateles Falls NY

A61B 1500

128746

A portable, hand-held tympanometer that has the capability of performing the tympanometry and of displaying and storing the test results all within the hand-held instrument. A separate unit that is not in any way attached to the tympanometer during the testing is provided to print the test results and to recharge the tympanometer battery. The tympanometer has a body portion and a head portion to which a speculum is attached, the speculum being adapted to engage the canal of the ear being examined in sealed relation thereto. A speaker in the speculum transmits acoustic signals into the ear canal and a microphone in the speculum receives the signals that are reflected back through the canal by the tympanic membrane. A pressure transducer is located in the head portion of the tympanometer, and a miniature pump located in the body portion operates to introduce a range of pressures into the ear canal while the acoustic signals are being transmitted and received. The tympanometer also includes a liquid crystal display in the head portion which indicates the admittance of the tympanic membrane as determined by the speaker and microphone.