Apparatus and method for detecting an apical position
US5096419A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 14, 1991 |
| Grant date | Mar 17, 1992 |
| Priority date | — |
| Expiry date | Aug 14, 2011 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61C19/042
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An apical position detection apparatus for detecting an apical position depending on the change in the impedance between a measuring electrode inserted in a root canal and an oral electrode connected to a soft oral tissue, the apparatus being characterized in that it comprises a signal output means which applies measurement signals with different frequencies between the measuring electrode and the oral electrode and a relative ratio detection means for calculating the ratio of root canal impedance values obtained depending on the measurement signals, whereby the detection apparatus detects the apical position by sensing that an equivalent impedance decreases and that the ratio of the root canal impedance values changes as the leading edge of the measuring electrode approaches the apical position. A method for detecting the apical position by using this apparatus is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.