Dental handpiece with a root canal length measurement function

Details Dental handpiece with a root canal length measurement function Dental handpiece with a root canal length measurement function

2005-09-29

2008-11-18

Wilson, John J (Department: 3732)

Dentistry

Apparatus

Having gauge or guide

C433S075000, C433S027000

Reexamination Certificate

active

07452208

ABSTRACT:
A handpiece for measuring root canal length comprises an outer sleeve that is substantially non-insulating, a connecting device, an instrument carrier, at least one transmission element within the outer sleeve, a length measuring circuit portion, a contact portion and an insulating portion. The instrument carrier is configured to receive a dental instrument. The transmission element transmits force to move the instrument carrier so that a dental instrument received in the instrument carrier executes a rotating, reciprocating and/or vibrating working movement. The length measuring circuit portion is disposed inside the handpiece and operable to transmit measuring signals for measuring length. The contact portion is operable to establish a conductive path between the dental instrument serving as an electrode and the length measuring circuit portion. The insulating portion insulates the length measurement circuit portion and the contact device, through which a voltage is applied during measurement, from the outer sleeve.

REFERENCES:
patent: 3745654 (1973-07-01), Ellman
patent: 4243388 (1981-01-01), Arai
patent: 5897315 (1999-04-01), Nakayama et al.
patent: 5902105 (1999-05-01), Uejima et al.
patent: 6053732 (2000-04-01), Sale
patent: 7070411 (2006-07-01), Nakanishi et al.
patent: 195 20 765 (1995-12-01), None
patent: 197 02 370 (1997-08-01), None
patent: 1 444 966 (2004-08-01), None

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