The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 17, 1991
Filed:
Feb. 16, 1990
Ronald D Salesky, Tabernacle, NJ (US);
Other;
Abstract
The digital apical foramen locating apparatus of the present invention utilizes the recognized fact that the conductance from the apical foramen to a patient's lip is not only equal to the conductance from the sulcus to the lip but is also constant from patient to patient. It further utilizes the recognition that there is a linear correspondence in the change of the conductance as the apical foramen is approached in root canal therapy. Utilizing this knowledge, the present invention employs a pair of fixed resistors to calibrate a single oscillator. This same oscillator is then used in the actual measurement and a comparison is made between the measured values and the stored reference values. In addition to a digital readout in 0.1 mm increments, there is an audible display whose cadence increases as the apex is approached and a graphical display which graphically illustrates to the dentist the location of the reamer in the canal and also the status of the probe's reliability.