US4028810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Root canal file
Assignee: Individual
•
Filing: 1975-08-11
•
Granted: 1977-06-14
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Expires: 1995-08-11
Abstract
Abstract An endodontic instrument for treating a pulp canal includes a handle portion adjustably mounted in telescoping relation on the shaft of an elongated working tool, with cooperating grooves in the shaft and handle preventing relative movement therebetween during use of the instrument. Means are provided for quickly and accurately adjusting the working length of the tool projecting from the handle and for quickly and reliably interlocking the tool and handle in the desired adjusted relationship with the end of the handle acting as a positive stop limiting the depth of penetration of the working tool portion during use of the instrument.
Inventors
- 👤 Bobby C. Vice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:02
CPC Classifications
A; A61; A61C; A61C5/00; A61C5/40; A61C5/44
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
179 words
An apparatus for determining the working length of a root canal file assembly of the type in which an elongated file has its shaft releasably mounted in a chuck of a handle assembly adapted to clamp the shaft in any desired position, said chuck including a nut threaded onto movable jaws of the handle assembly and operable to clamp and unclamp said shaft, the improvement wherein said apparatus comprises a body member, a measuring scale fixed on said body member, stop means mounted on said body member for movement along said scale, means releasably fixing said stop means in any desired position of adjustment along said scale, an elongated groove in said body and extending along said scale from said shoulder means, said groove being dimensioned to receive said root canal file therein, and jig means on said body for receiving said nut and cooperating therewith to prevent rotation thereof upon rotation of said handle assembly, said jig means including shoulder means for fixing the position of said nut relative to said scale and in alignment with said stop.
Claim 2
Independent Claim
179 words
An apparatus for determining the working length of a root canal file assembly of the type in which an elongated file has its shaft releasably mounted in a chuck of a handle assembly adapted to clamp the shaft in any desired position, said chuck including a nut threaded onto movable jaws of the handle assembly and operable to clamp and unclamp said shaft, the improvement wherein said apparatus comprises a body member, a measuring scale fixed on said body member, stop means mounted on said body member for movement along said scale, means releasably fixing said stop means in any desired position of adjustment along said scale, an elongated groove in said body and extending along said scale from said shoulder means, said groove being dimensioned to receive said root canal file therein, and jig means on said body for receiving said nut and cooperating therewith to prevent rotation thereof upon rotation of said handle assembly, said jig means including shoulder means for fixing the position of said nut relative to said scale and in alignment with said stop.
Claim 3
Dependent Claim
33 words
The apparatus as defined in claim 1 wherein said stop means includes abutment means projecting into said groove in position to be engaged by the end of a root canal file positioned therein.
Claim 4
Independent Claim
181 words
An apparatus for determining the working length of a root canal file assembly of the type in which an elongated file has its shaft releasably mounted in a chuck of a handle assembly adapted to clamp the shaft in any desired position, said chuck including a nut threaded onto movable jaws of the handle assembly and operable to clamp and unclamp said shaft, the improvement wherein said apparatus comprises a body member, a measuring scale fixed on said body member, stop means mounted on said body member for movement along said scale, means releasably fixing said stop means in any desired position of adjustment along said scale, and jig means on said body for receiving said nut and cooperating therewith to prevent rotation thereof upon rotation of said handle assembly, said jig means including shoulder means for fixing the position of said nut relative to said scale and in alignment with said stop, a substantially U-shaped recess formed in said body member and having two substantially parallel flat surfaces adapted to engage flat surfaces on said nut to prevent rotation thereof.
Claim 5
Independent Claim
181 words
An apparatus for determining the working length of a root canal file assembly of the type in which an elongated file has its shaft releasably mounted in a chuck of a handle assembly adapted to clamp the shaft in any desired position, said chuck including a nut threaded onto movable jaws of the handle assembly and operable to clamp and unclamp said shaft, the improvement wherein said apparatus comprises a body member, a measuring scale fixed on said body member, stop means mounted on said body member for movement along said scale, means releasably fixing said stop means in any desired position of adjustment along said scale, and jig means on said body for receiving said nut and cooperating therewith to prevent rotation thereof upon rotation of said handle assembly, said jig means including shoulder means for fixing the position of said nut relative to said scale and in alignment with said stop, a substantially U-shaped recess formed in said body member and having two substantially parallel flat surfaces adapted to engage flat surfaces on said nut to prevent rotation thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |