Dental stethoscope

• US 4,302,627 A
• Filed: 04/28/1980
• Issued: 11/24/1981
• Est. Priority Date: 08/09/1979
• Status: Expired due to Term

• Current Assignee: Kabushiki Kaisha Dental Electronics Kenkyujo
• Original Assignee: Kabushiki Kaisha Dental Electronics Kenkyujo
• Inventors: Inoue, Noboru
• Primary Examiner(s): Stellar, George G.
• Application Number:
  US06/144,487
• Time in Patent Office: 575 Days
• Field of Search: 179/1 ST, 128/734, 128/741, 128/774, 128/776
• US Class Current: 433/27
• CPC Class Codes: A61B 5/0534 for testing vitality of teeth
• CPC Class Codes: A61C 19/04 Measuring instruments specially adapted for dentistry A61C5/44 takes precedence; testing vitality of teeth A61B5/0534; radiation diagnosis specially adapted for dentistry A61B6/51
• CPC Class Codes: G01R 17/02 Arrangements in which the value to be measured is automatically compared with a reference value

Abstract

A measurement channel oscillator and a reference channel oscillator are provided in combination, a measurement probe and a mouth mucose lead element are respectively connected to the measurement channel oscillator, while one of a plurality of equivalent circuits each consisting of a pair of equivalent capacitor and equivalent resistor connected in parallel is selectively connected to the reference channel oscillator, the respective equivalent circuits corresponding to different stages of a decayed tooth, and the outputs of the measurement channel oscillator and the reference channel oscillator are respectively connected through the respective channels of a 2-channel stereo amplifier to a stereo head-phone, whereby an erosion stage of a decayed tooth can be correctly examined even if it is located at a hardly visible position in the mouth.

Claims

1. A dental stethoscope characterized in that a measurement channel oscillator and a reference channel oscillator are provided in combination, a measurement probe and a mouth mucose lead element are respectively connected to said measurement channel oscillator, while at least one of equivalent circuits each consisting of an equivalent capacitor and an equivalent resistor connected in parallel to each other is selectively connected to said reference channel oscillator, said respective equivalent circuits corresponding to different stages of a decayed tooth, and the outputs of said measurement channel oscillator and said reference channel oscillator are respectively connected to the respective channels of a stereo head-phone.

2. A dental stethoscope as claimed in claim 1 characterized in that said measurement channel oscillator and said reference channel oscillator are CR-oscillators.