Dentistry – Apparatus – Broach
Patent
1990-10-19
1992-07-07
O'Connor, Cary E.
Dentistry
Apparatus
Broach
433147, 433 72, A61C 502, A61C 300, A61C 1904
Patent
active
051278324
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a measuring handle for treating dental root canals.
THE RELATED ART
In the case of root canal instruments, such as drills, files, probes, etc., it is known to set them to a certain depth by means of a handle. Thereby, the handle can also have a graduated scale. In a measuring handle of this kind (DE AS 1 280 469), it is known to guide the instrument holder in the handle only longitudinally slidable, for this purpose the holder end being bent into a guide hook which is movable in a longitudinal slot of the handle. The sliding motion of the instrument is caused by a helical coil rotatably supported in a hollow cylinder space in the handle. In order to rotate this helical coil, a rotary disc is provided at the free handle end, which has only to be rotated correspondingly to set the depth level, in order to slide the instrument in the handle forward or backwards. Since the pitch of the helical coil is set to be self-locking, the instrument is locked in any position. Furthermore, the helical coil is so designed that its windings snugly surround the instrument holder and the superposed coil threads snugly surround the hook part, so that the instrument can be guided without shaking. In order to rotate the coil, the upper coil end engages in the rotary disk which is supported in a groove of the handle housing. This rotary disk is also provided with a slot, through which the instrument can be inserted into or removed from the handle. In the case of this known measuring handle, the handle is made of metal, whereby not only high manufacturing costs result, but also the surface configuration of the handle is limited. In order to get a secure grip on the handle, a number of annular knurls are provided, so that to a certain extent it can be guided securely with the bare fingers. However, these known measures do not suffice when the measuring handle has to be handled with gloves. It is therefore the object of the invention to improve a measuring handle for the treatment of dental root canals of the aforementioned kind, so that it can be sufficiently securely guided and the instrument can be set also when wearing gloves.
SUMMARY OF THE INVENTION
The object of the invention has been achieved through provision of a measuring handle for treatment of dental root canals which comprises: casing, the instrument being supported within the helical coil and including a guide hook at an end thereof engaging the helical coil to thereby allow transmission of a sliding motion from the helical coil to the instrument; guide hook and for providing guidance for longitudinal movement thereto; bulging radially outward therefrom and having a top and a bottom edge defining a length of the gripping bead; bead; includes: gripping bead; and with each of the knob and the helical coil for transmission of a rotary movement; and to the bottom edge adjacent along a length of the cylindrical bearing space for insertion and removal of the instrument from the handle casing.
A gripping bead at the one end of a handle offers a secure hold for a gloved hand, even when the handle is wet with water or saliva. Primarily gripping beads provided at both handle ends allow the handle, and together therewith the inserted instrument, to be securely guided up and down, because the gripping beads create perceivably thicker portions with respect to the middle portion of the handle. In such a gripping bead, it is also possible to accommodate advantageously a rotary handle with its rotary body. Thereby, the required extension of the longitudinal slot in the handle can remain covered on the outside by the rotary handle. The covering handle prevents the end of the guide hook from being blocked by the hand in this area during the insertion or removal of the instrument. If the handle is made of a moldable plastic material, it becomes possible to manufacture it in this shape with particular precision and little expense, in addition providing it with a surface permitting a firm grip.
With a precisely positioned knob a bett
REFERENCES:
patent: 1620990 (1927-03-01), Brothers
patent: 3247594 (1966-04-01), Nosonowitz
patent: 3324555 (1967-06-01), Zdarsky
patent: 3562913 (1971-02-01), Saffro
patent: 3713221 (1973-01-01), Malmin
patent: 3924334 (1975-12-01), Lentine et al.
patent: 4251214 (1981-02-01), Schnall
patent: 4582489 (1986-04-01), Listl
Cherichetti Cindy A.
Dubno Herbert
O'Connor Cary E.
Vereinigte Dentalwerke Antaeos-Beutelrock-Zipperer Zdarsky Ehrle
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