U.S. patent number 3,579,835 [Application Number 04/789,252] was granted by the patent office on 1971-05-25 for dental paste dispensing tool.
Invention is credited to Myron F. Levenson.
United States Patent |
3,579,835 |
Levenson |
May 25, 1971 |
DENTAL PASTE DISPENSING TOOL
Abstract
A rotary dental tool is provided with self-contained means for
automatically feeding a dentifrice to an applicator. The dentifrice
is contained in an elongated tubular element that serves as a
flexible coupling extending between a rotary drive and the tool
head. During operation, the drive causes twisting of the tubular
element, thereby urging the dentifrice toward the applicator.
Inventors: |
Levenson; Myron F. (Lyndhurst,
OH) |
Family
ID: |
25147057 |
Appl.
No.: |
04/789,252 |
Filed: |
January 6, 1969 |
Current U.S.
Class: |
433/82 |
Current CPC
Class: |
A61C
17/005 (20130101); B05C 17/00583 (20130101) |
Current International
Class: |
A61C
17/00 (20060101); A61c 003/06 () |
Field of
Search: |
;222/191 ;32/58,59 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Peshock; Robert
Claims
I claim:
1. In a dental tool with self-contained means for storing a
dentifrice and feeding it to the tool head, a handpiece taking the
form of a casing of the contra-angle type; a disposable insert in
the casing taking the form of an elongated rotatable element of
generally tubular construction that is capable of flexing to
conform to the shape of the handpiece; means in the tubular portion
of the insert forming a dentifrice reservoir that is closed at the
trailing end and in open communication with the tool head at the
leading end of the insert; a dentifrice applicator at the leading
end of the insert; and means at the trailing end of the insert for
coupling it to a rotary drive system whereby, when torsional forces
are exerted on the trailing end of the insert, the dentifrice in
said reservoir is urged toward the tool head and out of the casing
through said applicator.
2. Apparatus as defined in claim 1 wherein said casing is formed of
two symmetrical halves connected by a hinge to permit opening of
said casing for removal and replacement of the insert.
3. Apparatus as defined in claim 1 wherein said casing has a slot
formed in the sidewall thereof and extending therethrough and a
pushbutton in said slot extending outwardly from said casing and
means operatively connected to said pushbutton within said casing
for pressing against the insert to express dental paste from said
reservoir.
4. Apparatus as defined in claim 3 wherein said means connected to
said pushbutton is a lever arm integral with said casing and
resiliently connected to said casing at one end at an end of said
slot for pivotal movement in said slot.
5. Apparatus as defined in claim 3 wherein said means connected to
said pushbutton is a pressure shoe adapted to bear against said
coupling element adjacent said reservoir.
6. A disposable insert for use in a hollow dental handpiece of the
contra-angle type wherein said insert takes the form of an
elongated flexible element of generally tubular construction that
is susceptible of bending to conform to the contra-angle zone of
the handpiece and of independent rotation within the handpiece
while at the same time serving as a depletable dentifrice
reservoir, said tubular element being characterized:
a. at its leading end by an applicator through which the dentifrice
may be dispensed as needed,
b. at its trailing end by an axially projecting mandrel, and
c. by means therebetween for rotatably coupling the tubular portion
of the insert to the interior of the handpiece.
7. A disposable insert according to claim 6 wherein the tubular
portion of the insert is corrugated to enhance its flexiblity
within the contra-angle zone of the handpiece.
8. A disposable insert according to claim 6 wherein the applicator
at the leading end of the insert is formed integrally with the
tubular portion of the insert.
9. A disposable insert according to claim 6 wherein the mandrel at
the trailing end of the insert is formed integrally with the
tubular portion of the insert.
10. A disposable insert according to claim 9 wherein both the
applicator and the mandrel are formed integrally with the tubular
portion of the insert.
Description
BACKGROUND OF THE INVENTION
This invention relates to rotary dental tools and especially to
cleaning and polishing tools for use with a dentifrice or the like.
More particularly, the invention has to do with a tubular-coupling
element connecting the drive system and the applicator. The
dentifrice is supplied to the applicator from a reservoir in the
tubular-coupling element.
An important part of modern professional dental care is the
cleaning and polishing of a patient's teeth preferably using a
prophylactic paste containing for example a fluoride to inhibit
tooth decay. This is most commonly accomplished with a powered
rotary tool having an angular bend or "contra angle" as it is known
in the art. The tool is held by the dentist and periodically dipped
in a container of prophylactic paste. Frequent paste renewal is
important even for cooling the teeth in view of the frictional heat
developed.
The need for periodically removing the applicator from the
patient's mouth and dipping it in the paste is burdensome to the
dentist and lengthens the period of time needed to complete a
cleaning and polishing procedure. Also, the paste after being in
the patient's mouth only a short period of time becomes diluted by
the patient's saliva and a proper concentration of chemicals (such
as fluoride compounds) may not be applied to the teeth.
While certain techniques for the continuous automatic feeding of
dental paste to the tool head have been attempted, none have filled
the professional needs of the dentist and none have been effective
to provide a continuous uniform supply of paste to the patient's
mouth. The device of the present invention, however, meets the long
felt need described above and affords other features and advantages
heretofore not obtainable.
OBJECTS OF THE INVENTION
It is among the objects of the invention to continuously feed a
dental paste to the insert head of a dental tool during a dentist's
cleaning and polishing procedure.
Another object of the invention is to reduce the time required to
replenish the dental paste on the rotary head of the tool during
the cleaning and polishing procedure.
Still another object is to provide a disposable tool insert of low
cost construction which serves as a paste dispenser for the
cleaning and polishing of a patient's teeth.
These objects are accomplished by means of a dental polishing tool
provided as explained below with self-contained means for storing
and feeding a dentifrice to the tool head.
The tool includes a handpiece, preferably one taking the form of a
casing of the contra-angle type. It is adapted to receive a
disposable insert equipped with a mandrel extending coaxially of
the trailing end of the insert. The insert itself takes the form of
a resilient, flexible element of tubular construction containing a
charge of a dentifrice such, for example, as dental paste. The
mandrel with which the insert is equipped is designed to be rotated
about its axis by a cooperating drive system.
An applicator of suitable type is attached to the other end of the
flexible element. Rotation of the mandrel by the drive system
twists the flexible element about its axis and reduces the interior
cross section thereof. The result is to squeeze the paste out
through the applicator.
According to one embodiment of the invention the dispensing of
dental paste is assisted by means of a manually operated pressure
element or shoe which is located in the casing and which when
depressed pushes against the flexible element to force paste out to
the tool head.
According to another embodiment the flexible element is held in a
hinged casing formed by two semicylindrical halves which may be
easily opened to replace the flexible element when desired.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a dentist's rotary polishing tool
embodying the invention;
FIG. 2 is a longitudinal sectional view on an enlarged scale of the
polishing tool of FIG. 1;
FIG. 3 is a longitudinal sectional view of the flexible tubular
element contained within the casing of FIG. 1 but shown in its
unflexed condition prior to insertion in the casing;
FIG. 4 is a much enlarged end elevation of the flexible element as
viewed from the line 4-4 of FIG. 3;
FIG. 5 is a perspective view similar to FIG. 1 but showing a
modified form of the invention;
FIG. 6 is an elevational view of the embodiment of FIG. 5 showing
the hinged casing in its open position;
FIG. 7 is an elevational view on an enlarged scale of the
embodiment of FIG. 5 with parts broken away and shown in section
for the purpose of illustration;
FIG. 8 is a transverse cross-sectional view on an enlarged scale
taken on the line 8-8 of FIG. 7;
FIG. 9 is a fragmentary sectional view on an enlarged scale showing
a modified form of the embodiment of FIGS. 5 to 8;
FIG. 10 is a transverse cross-sectional view on an enlarged scale
taken on the line 10-10 of FIG. 9;
FIG. 11 is a longitudinal sectional view of a modified form of
flexible tubular element embodying the invention; and
FIG. 12 is a longitudinal sectional view similar to FIG. 11 but
showing still another variation of the flexible tubular
element.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring more particularly to the drawings, FIGS. 1 to 4 show a
rotary dental-polishing tool A embodying the invention and adapted
for connection to a rotary drive. The drive is transmitted by belts
and pulleys through a mechanical arm with flexible joints as is
customary in the art. The end of the mechanical arm is shown in
phantom lines in FIG. 1. Tool A has a tubular casing 10 with an
angular bend 11 (contra angle) which divides the casing into a
rearward leg 12 and a forward leg 11, the casing defining therein a
space for a flexible insert 14 with a mandrel 15 at one end, a
polishing head 16 at the other end and a flexible resilient tubular
portion intermediate its end which serves to transmit the rotary
drive around the angular bend 11 in the casing and which also
serves as a reservoir 17 for a charge 18 of dental paste.
The insert 14 is preferably formed of rubber or resilient plastic
and has a groove 19 at its forward end and a bearing groove 20 at
its rearward end. The groove 19 is adapted to receive a bearing
ring 21 formed inside the forward end of the casing 10 and the
groove 20 is adapted to receive a bearing ring 22 at the rearward
end of the casing 10 to keep the angularly disposed ends of the
insert in their proper positions during operation of the tool. The
insert 14 is shown in its natural unflexed condition in FIG. 3,
prior to its insertion in the casing 10. FIG. 2 shows a cover 23 in
phantom lines which may be used in connection with the casing if
desired.
In operation, the mandrel 15 is connected to a conventional drive
spindle to transmit the rotary drive through the insert 14 to the
applicator 16. During the polishing operation friction between the
applicator and the teeth of the patient causes a high torsional
load in insert 14 and this in turn causes "necking down" or
reduction in cross-sectional size of the reservoir 17 thus putting
a squeezing force on the charge 18 of dental paste located within.
This force causes a gradual expression of the paste during the
cleaning and polishing procedure, charge 18 being of a volume
calculated to serve the needs of one patient.
Referring next to FIGS. 5 to 8 there is shown an alternative form B
of dental-polishing tool embodying the invention. The casing 30 in
this instance is formed of two semicylindrical halves 31 and 32
connected together at an integral hinge 33 best shown in the open
position illustrated in FIG. 6. When the casing 30 is closed as
shown in FIG. 5 the two halves 31 and 32 are latched together by
integral clasp-type connections indicated by the numeral 34.
As viewed in cross section the embodiment of FIGS. 5 to 8 appears
generally the same as shown in FIG. 2 and the insert 14 within the
casing 30 is identical to that of the first embodiment.
As another aspect of the alternative form B of FIGS. 5 to 8, one of
the casing halves is provided with a dispensing button 35 located
at the end of a lever arm 36 which is formed integrally with the
casing 30 and which fits in a rectangular slot 37 in the casing
wall. When the dispensing button 35 is depressed (FIG. 7) it bears
inwardly against the resilient tubular wall of insert 14 and helps
squeeze the paste out through applicator 16. With this arrangement
the dentist may very easily increase the rate that the paste is
dispensed by pressing the button 35 with his thumb or finger during
the cleaning and polishing procedure.
FIGS. 9 and 10 show a variation of the embodiment of FIGS. 5 to 8
wherein a dispensing button 40 is connected to a pressure shoe 41
located entirely within the casing 30 rather than to a lever 36 as
shown in FIG. 7. The button 40 extends through a rectangular
opening 42 in the casing wall and is initially positioned from the
inside. This arrangement permits dispensing pressure to be applied
over a greater length of the insert 14.
FIGS. 11 and 12 show alternate of an insert forms within the
purview of the invention. FIG. 11 shows an insert 45 with a metal
mandrel 46 having a splined head 47 inserted in a matching socket
48 at the rearward end of insert 45. This arrangement is adapted
for certain types of standard dental equipment. In the same FIG. is
illustrated a variant wherein circumferential corrugations 49 are
formed in the forward portion of the insert. The corrugations
provide improved flexibility for contra-angle bends of up to as
much as 90.degree., and at the same time assure a more uniform rate
of bend with a reduced tendency to form a sharp crease at any
particular location.
FIG. 12 shows still another insert 50 wherein applicator 51 is
threaded into the end of an intermediate body portion 52 and the
lower end 53 has a coupling fork connected to an interlocking
mandrel 54.
It will be apparent from the foregoing description and drawings
that by using a dental tool embodying the invention, the need for
periodic replenishment of the dental paste at the tool head is
eliminated and the cleaning and polishing procedure can be
accomplished in a much shorter period of time with a much more
uniform dispensing of dental paste to the teeth during the
procedure. Also, it will be apparent that the insert is of simple
low cost construction and can be economically disposed of after
each operation. If desired, a whole new casing may be coupled to
the mechanical arm of the apparatus prior to work on each
patient.
While the invention has been shown and described with respect to
specific embodiments thereof, this is for the purpose of
illustration rather than limitation and other modifications and
variations will be apparent to those skilled in the art within the
intended spirit and scope of the invention. Wherefore, the patent
is not to be limited in any way that is inconsistent with the
extent to which the progress in the art has been advanced by the
invention.
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