Detecting and indicating a proximity of a dental instrument...

A - Human Necessities – 61 – C

Patent

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A61C 19/04 (2006.01)

Patent

CA 2555278

An apparatus that indicates a proximity of a dental instrument in a tooth~s root canal to the canal~s apical foramen while using the dental instrument to perform a dental/medical procedure. The apparatus includes a signal generator that provides divider signal across a first node and a third node, and a reference impedance coupled between the first node and a second node. The second node and third node include configuration for electrically coupling between a tip of the dental instrument and an electrode coupled with a body tissue of the patient, a stimulation signal being defined across the second node and the third node. The apparatus also includes a microprocessor operable to compare the stimulation signal and the divider signal, and generate a proximity signal in response to the comparison, and a proximity indicator that indicates the proximity of the dental instrument to the apical foramen in response to the proximity signal.

L'invention concerne un appareil qui indique le degré de proximité entre un instrument dentaire introduit dans le canal radiculaire et le foramen apical du canal, lorsque l'instrument dentaire est utilisé pour une intervention dentaire/médicale. Cet appareil comprend un générateur de signal qui envoie signal diviseur dans un premier et dans un troisième noeud, et une impédance de référence montée entre le premier et le second noeud. Le second et le troisième noeud présentent une configuration permettant d'établir un couplage électrique entre la pointe d'un instrument dentaire et une électrode couplée à un tissu organique du patient, un signal de stimulation étant formé dans le second et le troisième noeud. Cet appareil comprend également un microprocesseur permettant de comparer le signal de stimulation et le signal diviseur et de générer un signal de proximité en réponse à cette comparaison, et un indicateur de proximité qui indique le degré de proximité entre l'instrument dentaire et le foramen apical en réponse au signal de proximité.

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