Dental stethoscope
US4302627A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 28, 1980 |
| Grant date | Nov 24, 1981 |
| Priority date | — |
| Expiry date | Apr 28, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R17/02
- WIPO fieldMedical technology
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.